WO2024237290A1 - Sheet for structure - Google Patents

Abstract

A sheet 40 for a structure comprises a functional layer 42, an intermediate layer 44, an adhesive layer 46, and a reinforcing body 48. The functional layer 42 has excellent weather resistance. The intermediate layer 44 contributes to rigidity and the like of the sheet. The adhesive layer 46 makes contact with an underlayer. A test piece of the sheet 40 has a bending part 34 which has a length of 50 mm and a peripheral length 70 mm, for which the energy of compressive deformation at 20 mm and 60°C is not less than 2.0 mJ, and for which the energy of compressive deformation at 20 mm and -10°C is not more than 60.0 mJ.

Description

Structural Sheets

This specification discloses a sheet that is attached to a structure for use.

When a slate roof on a house is exposed to wind and rain for a long period of time, it deteriorates. There is concern that a deteriorated slate roof may leak. To prevent leaks, paint is applied to the slate roof. However, in the case of a severely deteriorated slate roof, even applying paint may not prevent leaks.

Patent Document 1 discloses a method for repairing a roof using a sheet having a polymer cement layer and a resin layer. By attaching this sheet to the roof, it is possible to prevent roof leaks.

JP 2022-101896 A

When a sheet is applied to a roof with a step, it is preferable for the sheet to conform to the step. The sheet needs to have the ability to conform and deform to conform to the step. A flexible sheet will deform significantly under its own weight when a worker grasps it. This deformation makes it difficult for the worker to handle the sheet. The sheet also needs to have an appropriate level of rigidity.

When repairing roofs other than slate roofs, there is also a demand for the sheet to be easy to follow and handle. When repairing or reinforcing structures other than roofs, there is also a demand for the sheet to be easy to follow and handle.

The applicant's intention is to provide a sheet for structures that has excellent conformability and ease of handling.

The structural sheet disclosed in this specification is a structural sheet having a functional layer and an adhesive layer, and is curved so that a pair of short sides on the same surface of the rectangular structural sheet with short sides of 50 mm and long sides of 100 mm overlap each other, and a pair of regions of the structural sheet from the edge of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the structural sheet. In this state, the energy of compressive deformation of 20 mm of the curved portion at 60°C is 2.0 mJ or more, and the energy of compressive deformation of 20 mm of the curved portion at -10°C is 60.0 mJ or less.

This structural sheet is easy to handle even when installed in summer. This structural sheet is easy to follow even when installed in winter.

FIG. 1 is a perspective view showing a portion of a structural sheet according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is an enlarged view of the portion indicated by reference symbol III in FIG. FIG. 4 is a front view showing the structural sheet of FIG. 1 together with a roof. FIG. 5 is an enlarged view of a portion indicated by the symbol V in FIG. FIG. 6 is an enlarged view of a portion designated by reference character VI in FIG. FIG. 7 is a perspective view showing a test piece for measuring the energy of compressive deformation of the structural sheet of FIG. FIG. 8 is a cross-sectional perspective view of the test strip of FIG. 7 shown with a clamp. FIG. 9 is a front view of the test piece and gripper of FIG. 8 shown together with an indenter. FIG. 10 is a plan view showing the gripper and indenter of FIG. FIG. 11 is a graph showing the results obtained by measurements using the tester of FIGS. FIG. 12 is a cross-sectional view showing a portion of a structural sheet according to another embodiment. FIG. 13 is an enlarged plan view showing a part of a reinforcing body included in the structural sheet of FIG. FIG. 14 is a cross-sectional view showing a schematic configuration of a structural sheet according to the fourth embodiment. FIG. 15 is a cross-sectional view showing a schematic configuration of a structural sheet according to the fifth embodiment. FIG. 16 is a cross-sectional view showing a schematic configuration of a structural sheet according to the sixth embodiment. FIG. 17 is a schematic diagram showing the structure of a supply item containing a structural sheet according to the present disclosure.

Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.
First Embodiment
[Layer structure]
FIG. 1-3 shows a sheet 2 for structures (hereinafter, also referred to as "sheet 2"). The planar shape of this sheet 2 is generally rectangular. As is clear from FIG. 3, this sheet 2 includes a functional layer 4, an intermediate layer 6, and an adhesive layer 8, each of which includes at least one layer. As is clear from FIG. 3, the sheet 2 includes, for example, a single functional layer 4, an intermediate layer 6, and an adhesive layer 8. The material of each layer will be described in detail later. This sheet 2 is attached to a structure. The sheet 2 may have a release paper or a release film (see the release film 9 in FIG. 14). The release paper and the release film are laminated with the adhesive layer 8. The release paper or the release film may remain until a predetermined timing, such as when the sheet 2 is used. As will be described later, at least one of the adhesive layer 8 and the functional layer 4 may contain a filler.

[Roof Repair]
A typical application of this structural sheet 2 is the repair of a roof of a structure. A repaired roof 10 is shown in Figures 4-6. In these figures, two sheets 2 (a first sheet 2a and a second sheet 2b) are shown together with the roof 10. The specifications of the second sheet 2b are the same as those of the first sheet 2a. Examples of the roof 10 include a slate roof, a tile roof, a steel roof (including a folded plate roof), a copper roof, a galvanized iron roof, and a concrete roof.

In FIG. 4, the position of the lower edge 12a of the first sheet 2a is generally aligned with the position of the lower end 14 of the roof 10. The first sheet 2a is attached to the roof 10 as a whole. As shown in FIG. 5, the roof 10 has a step 16. The first sheet 2a is curved in the vicinity of the step 16. This curvature allows the first sheet 2a to follow the step 16.

As shown in FIG. 6, the second sheet 2b overlaps the vicinity of the upper edge 18a of the first sheet 2a near its lower edge 12b. This overlap forms a seam 20. The portion of the second sheet 2b other than the seam 20 is affixed to the roof 10. The upper edge 18a of the first sheet 2a forms a step 22 between the first sheet 2a and the roof 10. The second sheet 2b is curved near this step 22. This curvature allows the second sheet 2b to follow the step 22.

The structural sheet 2 is usually attached to the roof 10 via a primer layer. In this specification, the phrase "the sheet is attached to the roof" also refers to the case where the sheet 2 is attached to the roof 10 via a primer layer or the like. The primer layer is not shown in Figures 5 and 6.

[Compressive deformation energy]
The energy E1 of the structural sheet 2 for 20 mm compressive deformation at 60° C. is preferably 2.0 mJ or more. When repairing the roof 10, a worker lifts the sheet 2 with his/her hands. At this time, gravity is applied to the sheet 2. The sheet 2 deforms due to its own weight. This deformation causes the sheet 2 to hang down from the worker's hands. In the sheet 2 having the energy E1 of 2.0 mJ or more, the degree of deformation when gravity is applied is small. This sheet 2 is easy for a worker to handle. With this sheet 2, deformation can be suppressed even in a high temperature environment such as summer. From the viewpoint of suppressing deformation, the energy E1 is more preferably 3.0 mJ or more, even more preferably 6.0 mJ or more, and particularly preferably 9.5 mJ or more.

The energy E2 of this structural sheet 2 for a 20 mm compressive deformation at -10°C is preferably 60.0 mJ or less. As described above, the sheet 2 curves in the vicinity of the step 16 (22). A sheet 2 with an energy E2 of 60.0 mJ or less can conform well to the step 16 (22). When repairing a roof 10 with this sheet 2, a space is unlikely to be created between the sheet 2 and the roof 10. This sheet 2 exhibits excellent conformability even in low-temperature environments such as winter. From the viewpoint of conformability, the energy E2 is more preferably 57.1 mJ or less, and particularly preferably 44.7 mJ or less.

[Energy Measurement]
7-10 show a method for measuring the compressive deformation energies E1 and E2. In this measurement method, a test piece 24 shown in FIG. 7 is cut out from the structural sheet 2. The planar shape of this test piece 24 is rectangular. The length of the short side 26 of this rectangle is 50 mm, and the length of the long side 28 is 100 mm. The layer structure of this test piece 24 is the same as the layer structure of the sheet 2.

The test piece 24 is curved as shown by the arrow A1 in Figure 7. This bending brings one short side 26 into contact with the other short side 26. The test piece 24 is gripped by a gripping tool (fixture) 30 as shown in Figures 8 and 9. This gripping forms an overlapping portion 32 in the test piece 24. The length of the overlapping portion 32 is 15 mm. The portion of the test piece 24 other than the overlapping portion 32 is the curved portion 34 of the sheet 2. The circumference of this curved portion 34 is 70 mm {(100-15 x 2) mm}.

This test piece 24 is subjected to a compression test. The pressing tool, which is the device for this test, is shown in Figures 9 and 10. This pressing tool has an indenter 36 and a shaft 38. This indenter 36 has a disk shape. This indenter 36 has a diameter of 100 mm and a thickness of 10 mm. This indenter 36 descends as shown by arrow A2 in Figure 9. The descending speed is 30 mm/min. The force is measured between the time when this indenter 36 hits the curved portion 34 and the time when the indenter 36 has further descended 20 mm from this point.

Energy is calculated using the following formula (1):

In this formula (1), E represents energy (mJ), F represents force (N), and s represents the displacement (mm) of the indenter 36.

Figure 11 shows a graph of the measurement results. In this graph, the horizontal axis is the displacement (stroke) of the indenter 36, and the vertical axis is the force. The area of the hatched zone in this graph is the energy E (E1, E2 or E3). In other words, the energy is the integral of the force F from zero to 20 mm of displacement.

Energy E1 is measured in an environment with a temperature of 60°C. Energy E2 is measured in an environment with a temperature of -10°C. The measurement conditions for energy E3 will be described in detail later.

An example of a gripping tool 30 suitable for this test is the "PFG-1kNA" product name manufactured by Shimadzu Corporation. An example of a tester suitable for this test is the "Autograph AGX-V 10kN" product name manufactured by Shimadzu Corporation.

The above test method and energies E1 and E2 can also be rephrased as follows.
That is, the energy E1 is the energy of compressive deformation of the curved portion 34 in a 60° C. environment, calculated by the calculation in (4) below, when a deformation test is performed by sequentially performing the operations described in the following items (1), (2), (3), and (4), and has a value of 2.0 mJ or more. The energy E2 is the energy of compressive deformation of the curved portion 34 in a −10° C. environment, calculated by the calculation in (4) below, when a deformation test is performed by sequentially performing the operations described in the following items (1), (2), (3), and (4), and has a value of 60.0 mJ or less.
(1) A rectangular structural sheet 2 having short sides of 50 mm and long sides of 100 mm is prepared as a test piece 24 (see FIG. 7).
(2) The test piece 24 is bent so that a pair of short sides on the same surface overlap each other, and a pair of regions of the test piece 24 from the edges of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture to form a curved portion 34 with a circumference of 70 mm between the pair of regions of the test piece 24 (see Figure 8).
(3) With the surfaces of the pair of regions of the test piece 24 arranged parallel to the vertical direction and the curved portion 34 facing upward, a pressing tool having a disk-shaped indenter 36 with a pressing surface having a diameter of 100 mm and a thickness of 10 mm is used to bring the indenter 36 of the pressing tool into contact with the curved portion 34 from above in an environment of humidity 50±10% RH, and the indenter 36 is moved downward by 20 mm at a test speed of 30 mm/min (see FIG. 9 ).
(4) The energy required to move the indenter 36 is calculated.

[Functional layer]
As is clear from Fig. 3, the functional layer 4 of this embodiment is, as an example, located on the outermost surface side. In other words, when the sheet 2 is attached to a structure, the functional layer 4 is located furthest from the structure. The functional layer 4 of this embodiment is disposed above the adhesive layer 8. The functional layer 4 contributes to a function desired for the sheet 2. Examples of such functions include light resistance, weather resistance, heat resistance, abrasion resistance, chemical resistance, water impermeability, moisture impermeability, and moisture permeability. The functional layer 4 can contribute to one or more functions.

The material of the functional layer 4 is a polymer composition. This functional layer 4 is generally flexible. The sheet 2 having this functional layer 4 can conform to the unevenness of the substrate. The polymer composition includes a base polymer. Synthetic resins, synthetic rubbers, and natural rubbers can be included in the composition as base polymers.

When weather resistance is desired for the functional layer 4, the weather resistance of the functional layer 4 can be controlled, for example, by adjusting the material of the functional layer 4 or the selection and content of the material in the functional layer 4. When weather resistance is desired for the functional layer 4, the material of the functional layer 4 is preferably, for example, a base polymer that is not easily degraded by ultraviolet light. Specifically, examples of methods include arranging a material (polymer, etc.) that can form a large number of bond structures having a bond energy stronger than ultraviolet light (410 KJ/mol) in the functional layer 4, or increasing the content of the material in the functional layer 4. Examples of polymers that can contribute to the weather resistance of the functional layer 4 and the flexibility of the sheet 2 include acrylic resin, acrylic urethane resin, acrylic silicone resin, fluororesin, soft epoxy resin, and polybutadiene.

Furthermore, from the viewpoint of reducing the number of reaction sites in the functional layer 4 and making the functional layer 4 chemically stable, the functional layer 4 may contain a material having a structure with few double bonds. If the functional layer 4 contains a large amount of such material, the chemical stability of the functional layer 4 increases. An example of such a material is a non-diene rubber. Specifically, the non-diene rubber may be at least one of CIIR (chlorinated butyl rubber), BIIR (brominated butyl rubber), and EPDM (ethylene propylene rubber). As a method for forming a large amount of the bond structure in the functional layer 4, for example, a method of unevenly distributing at least one of a radical trapping material that traps radicals generated by irradiation with energy rays such as ultraviolet (UV) rays, an additive such as HALS that absorbs UV rays and suppresses the generation of radicals, and an antioxidant such as a phenolic or thioether type can be exemplified.

From the viewpoint of weather resistance, an example of a resin that is particularly suitable for the base polymer of the functional layer 4 of this embodiment is an acrylic silicone resin. The acrylic silicone resin contains siloxane bonds. The acrylic silicone resin also has excellent heat resistance and cold resistance. Specific examples of compositions containing an acrylic silicone resin include "Cool Life SP Black (CB1) P5-0" manufactured by Dainichi Seikagaku Kogyo Co., Ltd., "Bell Earth Elastic Black" manufactured by Fujikura Kasei Co., Ltd., "Aronble Coat T-1000" manufactured by Toagosei Co., Ltd., and "Acryset EMN325E" and "U-Double EF008" manufactured by Nippon Shokubai Co., Ltd.

The polymer composition of the functional layer 4 may contain additives such as pigments, fillers, reinforcing materials, and antifouling agents, as necessary. Functional layer 4 containing pigments has excellent cosmetic properties. The polymer composition may contain organic pigments and inorganic pigments. Examples of fillers include metal oxide particles such as silica, alumina, and titania. Examples of reinforcing materials include cellulose nanofibers. The content of each additive is adjusted according to its function.

In FIG. 3, the arrow T1 indicates the thickness of the functional layer 4. From the viewpoint of functionality, the thickness T1 is preferably 10 μm or more, more preferably 30 μm or more, and particularly preferably 40 μm or more. From the viewpoints of the conformability, productivity, and light weight of the sheet 2, the thickness T1 is preferably 500 μm or less, more preferably 300 μm or less, and particularly preferably 200 μm or less. The structural sheet 2 may have two or more functional layers 4. Furthermore, when the functional layer 4 contains a filler, it may contain the same filler as the filler contained in the intermediate layer 6 described below.

[Middle layer]
The intermediate layer 6 contributes to the rigidity of the sheet 2. The intermediate layer 6 is, for example, a layer that defines the shape of the sheet 2. The intermediate layer 6 has, for example, a function of maintaining the overall shape of the sheet 2. A preferred material for the intermediate layer 6 is a composite material of a polymer and a filler. This makes it easier to impart a predetermined rigidity to the structural sheet 2. Examples of the polymer include acrylic resin, acrylic silicone resin, fluororesin, silicone resin, epoxy resin, ethylene-vinyl acetate copolymer, and styrene-butadiene copolymer. Examples of the filler include cement, silica, alumina, titanium oxide, calcium carbonate, and carbon black. A preferred composite material is, for example, polymer cement. This polymer cement includes a polymer and cement. Examples of the cement include Portland cement, alumina cement, and a mixture thereof. As an example, Portland cement is preferred. In this way, the filler, which is a material for the intermediate layer 6, may contain cement. The filler may also contain at least one of sand and aggregate that constitute mortar. The above-listed materials may be used alone or in combination.

By controlling the ratio of the resin component and the filler component, which are the materials of the intermediate layer 6, the rigidity of the structure sheet 2 can be easily controlled and the freedom of material design can be improved. In addition, the thickness of the intermediate layer 6 can be obtained to an extent that makes it easy to handle. Furthermore, for example, by adjusting the particle shape of the filler, the rigidity of the structure sheet 2 can be controlled. Specific examples of the particle shape of the filler include spherical, needle-like, amorphous, and tetrapod-like shapes. Furthermore, by adjusting the thickness of the intermediate layer 6, the rigidity of the structure sheet 2 can be controlled.

Specific examples of compositions containing a polymer suitable for the intermediate layer 6 include "Spring Coat Brush Mixture" manufactured by Kikusui Chemical Industry Co., Ltd. and "Aronbull Coat A450 Base" manufactured by Toagosei Co., Ltd. Specific examples of cement compositions that are fillers suitable for the intermediate layer 6 include "Spring Coat Brush Powder" manufactured by Kikusui Chemical Industry Co., Ltd. and "Aronbull Coat A450 Setter" manufactured by Toagosei Co., Ltd.

When the intermediate layer 6 contains a polymer and a filler, the mass ratio of the solids of the polymer to the filler is preferably, for example, 5/95 or more and 70/30 or less. An intermediate layer 6 having this ratio of 5/95 or more has excellent adhesion to other layers (functional layer 4). Furthermore, in a sheet 2 having an intermediate layer 6 having this ratio of 5/95 or more, the energy E2 is small. Therefore, this sheet 2 has excellent tracking properties. From these viewpoints, this ratio is more preferably 12/88 or more, and particularly preferably 27/73 or more. In a sheet 2 having an intermediate layer 6 having this ratio of 70/30 or less, the energy E1 is large. Therefore, this sheet 2 has excellent handleability. From this viewpoint, this ratio is more preferably 60/40 or less, and particularly preferably 45/55 or less.

In FIG. 3, the arrow T2 indicates the thickness of the intermediate layer 6. From the viewpoint of the handleability of the sheet 2, the thickness T2 is preferably 100 μm or more, more preferably 200 μm or more, and particularly preferably 300 μm or more. From the viewpoints of the conformability, productivity, and light weight of the sheet 2, the thickness T2 is preferably 1500 μm or less, more preferably 1200 μm or less, and particularly preferably 700 μm or less. The structure sheet 2 may have two or more intermediate layers 6. The structure sheet 2 may have a layer structure that does not include an intermediate layer 6.

In FIG. 3, the arrow Tt indicates the total thickness of the sheet 2. From the viewpoint of the ease of handling of the sheet 2, the ratio of the thickness T2 of the intermediate layer 6 to the total thickness Tt is preferably 30% or more, more preferably 45% or more, and particularly preferably 55% or more. From the viewpoints of the conformability, productivity, and light weight of the sheet 2, this ratio is preferably 85% or less, more preferably 75% or less, and particularly preferably 70% or less.

The structure sheet 2 may have one or more intermediate layers 6. The number of intermediate layers 6 included in the structure sheet 2 is set taking into consideration, for example, the overall thickness of the structure sheet 2, the function to be imparted to the intermediate layers 6, the length of the factory production line, or the production cost of the structure sheet 2. For example, if a single intermediate layer 6 having a predetermined thickness cannot be obtained due to a short factory production line, a layered structure of multiple intermediate layers 6 having a predetermined overall thickness can be formed by applying multiple coats of the material for the intermediate layer 6.

[Adhesive layer]
The adhesive layer 8 abuts against the base. The sheet 2 can be attached to the structure by the adhesive force of the adhesive layer 8. The adhesiveness of the adhesive layer 8 can be controlled, for example, by adjusting the thickness and surface properties of the adhesive layer 8, and the material of the adhesive layer 8. When controlling the surface properties of the adhesive layer 8, for example, a microstructure described later can be adopted. Furthermore, setting the thickness of the adhesive layer 8 to an appropriate value that is neither too thick nor too thin is also effective in controlling the adhesiveness of the adhesive layer 8. In addition, from the viewpoint of easily controlling the adhesive force of the adhesive layer 8 within a predetermined range, it is also preferable to adjust the adhesive material and the thickness of the adhesive layer 8 in combination.

More specifically, examples of materials for the adhesive layer 8 include adhesives that have a low glass transition temperature (Tg) and can utilize van der Waals forces or electrostatic forces, such as acrylic, silicone with siloxane bonds, rubber, and urethane-based adhesives. The adhesive strength of the adhesive layer 8 can be controlled by adjusting the thickness of the adhesive layer 8 and the degree of crosslinking of the adhesive layer 8. The attachment surface of the adhesive layer 8 may also be configured with a microstructure like the limbs of a gecko (a structure that has a large surface area and can utilize intermolecular forces). Furthermore, the adhesives and the microstructures may be used in combination.

The material of the adhesive layer 8 in this embodiment is, for example, a polymer-based adhesive composition. Examples of polymers suitable for this adhesive composition include acrylic resin, silicone, polyurethane, polyester, natural rubber, and synthetic rubber. A particularly preferred polymer as the base material is acrylic resin. Specific examples of adhesive compositions include those available from Toyochem Co., Ltd. under the trade names "Olivine BPS6574," "Olivine BPS6554," and "Olivine BPS5565K."

The adhesive composition may contain a curing agent. When the substrate is an acrylic resin, a preferred curing agent is an isocyanate curing agent. The ratio of the isocyanate curing agent to 100 parts by mass of the acrylic resin is preferably 1.0 part by mass or more, more preferably 2.0 parts by mass or more, and particularly preferably 2.5 parts by mass or more. This ratio is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and particularly preferably 7 parts by mass or less.

The adhesive composition may contain a tackifier. Examples of tackifiers include rosin-based tackifiers, terpene-based tackifiers, petroleum resin-based tackifiers, and phenolic resin-based tackifiers. The ratio of the tackifier to 100 parts by mass of the base polymer is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and particularly preferably 1.5 parts by mass or more. This ratio is preferably 15 parts by mass or less, more preferably 10 parts by mass or less, and particularly preferably 7 parts by mass or less. Specific examples of tackifiers include Arakawa Chemical Industries Co., Ltd.'s product names "Ester Gum H", "Ester Gum AA-V", and "Ester Gum 105".

In Fig. 3, an arrow T3 indicates the thickness of the adhesive layer 8. From the viewpoint of adhesiveness, the thickness T3 is preferably 20 µm or more, more preferably 40 µm or more, and particularly preferably 50 µm or more. From the viewpoints of productivity, light weight, and handleability of the sheet 2, the thickness T3 is preferably 300 µm or less, more preferably 200 µm or less, and particularly preferably 150 µm or less. The structure sheet 2 may have two or more adhesive layers 8.
[Release film]
The release film 9 is disposed (attached) on the surface of the adhesive layer 8 opposite to the intermediate layer 6. The release film 9 is preferably attached to the sheet for structure 2 for the purpose of protecting the surface of the adhesive layer 8 before use. The release film 9 is peeled off when the sheet for structure 2 is attached. The sheet for structure 2, with the adhesive layer 8 exposed as a result of the release film 9 being peeled off, is attached to the structure by bringing the adhesive layer 8 into contact with the surface of the structure.

The structure of the release film 9 is not particularly limited, and may be, for example, a sheet having a support layer and a peeling layer. Examples of materials constituting the support layer include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polyethylene, polypropylene and polymethylpentene, polyamides such as nylon 6, vinyl resins such as polyvinyl chloride, acrylic resins such as polymethyl methacrylate, cellulose resins such as cellulose acetate, and synthetic resins such as polycarbonate. The support layer may also be formed with paper as the main component. Furthermore, the support layer may be a laminate having two or more constituent layers.

Examples of materials constituting the release layer include silicone resin, melamine resin, and fluorinated polymer. The release layer can be formed, for example, by applying a coating liquid containing the material constituting the release layer and an organic solvent onto the support layer by a known coating method such as gravure coating, roll coating, comma coating, or lip coating, and then drying and curing the coating film formed by the application. In addition, when forming the release layer, the surface of the support layer on which the release layer is to be formed may be previously subjected to a corona treatment or an easy-adhesion treatment.

[Other layers]
The sheet for a structure 2 may have another layer located on the functional layer 4. A typical other layer is, for example, a clear paint layer. The other layer may be a layer that reinforces or adds a function such as design or heat insulation. The sheet for a structure 2 may have a layer located between the functional layer 4 and the intermediate layer 6. The sheet for a structure 2 may have a layer located between the intermediate layer 6 and the adhesive layer 8.

[Total thickness]
The total thickness Tt of the structural sheet 2 is preferably 200 μm or more, more preferably 300 μm or more, and particularly preferably 400 μm or more. The total thickness Tt is preferably 5.0 mm or less, more preferably 3.0 mm or less, and particularly preferably 1.0 mm or less.

[Flexibility of structural sheets]
The structure sheet 2 has the above-mentioned rigidity and also has a suitable flexibility. For example, the structure sheet 2 has flexibility to the extent that it can be wound into a roll. The roll-shaped winding referred to here refers to winding the structure sheet 2 around a roll core material having a diameter of, for example, several centimeters or more and several tens of centimeters or less (specifically, for example, a diameter of 10 mm or more and 300 mm or less). Even with a thinner roll core material, the structure sheet 2 can be wound up to several meters by hand winding or the like. Therefore, for example, the structure sheet 2 can be managed in a roll shape. Furthermore, it is also possible to unfold the structure sheet 2 wound in a roll shape at the construction site, and quickly prepare and construct the structure sheet 2 cut into a predetermined size. Therefore, the structure sheet 2 can be easily and simply applied to a construction target having a relatively large area.

[Production method]
An example of a manufacturing method for this structural sheet 2 is described below. In this manufacturing method, the polymer composition of the functional layer 4 is mixed with a solvent to obtain a first coating material. This first coating material is applied onto a base film to obtain a first coating film. This first coating film is heated, and the solvent volatilizes from the first coating material. This heating hardens the base polymer in the first coating film, and the functional layer 4 is obtained. The base film is a shape-imparting film (sheet) that imparts a shape to the first coating film.

Next, the composite material of the intermediate layer 6 is mixed with a solvent to obtain a second paint. This second paint is applied onto the functional layer 4 to obtain a second coating film. This second coating film is heated, and the solvent evaporates from the second paint. This heating hardens the polymer, and the intermediate layer 6 is obtained.

Next, the adhesive composition of the adhesive layer 8 is mixed with a solvent to obtain a third coating material. This third coating material is applied onto a release paper or film to obtain a third coating film. This third coating film is heated, and the solvent evaporates from the third coating material to obtain the adhesive layer 8.

This adhesive layer 8 is overlaid on the intermediate layer 6. Furthermore, the base film is peeled off from the functional layer 4, and the release film is peeled off from the adhesive layer 8 to obtain the structural sheet 2. Note that at least one of the release paper or release film and the base film may be peeled off and removed before use.

Here, specific examples of the base film will be described. The base film is used as a substrate when manufacturing the structural sheet 2. The base film may include resin laminated paper, which is a process paper used in the manufacturing process of the structural sheet 2, or a resin film. The resin laminated paper referred to here may have an olefin resin layer such as polypropylene or polyethylene. Specifically, an example of the base film that can be used is a PP laminated sheet (manufactured by, for example, Lintec Corporation). The thickness of this PP laminated sheet is, for example, 50 μm or more and 200 μm or less.

[effect]
This structural sheet 2 has excellent conformability and can therefore be applied to roofs 10 having steps, as described above. By patching together a plurality of sheets 2, a wide area of the surface of the roof 10 can be covered with the sheet 2. Since the adhesive layer 8 has excellent adhesiveness, a wide area of the surface of the roof 10 can be covered with the sheet 2 even if the surface of the roof 10 is made of a mixture of materials. For example, a wide area of the surface of the roof 10 can be covered with the sheet 2 even if the surface of the roof 10 includes both metal and slate.

The entire surface of the roof 10 may be covered with the sheet 2. In this specification, the surface of the roof 10 means the surface that is visible when the roof 10 is viewed from above in the vertical direction. Repair methods in which the entire surface of the roof 10 is covered with a single type of sheet 2 are not found in conventional construction methods.

This sheet 2 is lighter than steel plates, copper plates, galvanized iron sheets, etc. Therefore, even if the surface of the roof 10 is covered with the sheet 2 over a wide area, the adverse effect on the earthquake resistance of the building is small. When the sheet 2 deteriorates with age, another sheet 2 may be laminated on this sheet 2. Even in this case, the adverse effect on the earthquake resistance of the building is small. From the viewpoint of earthquake resistance, the density of the sheet 2 is preferably 4.0 g/cm ³ or less, more preferably 3.0 g/cm ³ or less, and particularly preferably 2.5 g/cm ³ or less. This density is much smaller than the density of aluminum-zinc alloy plated steel sheet (trade name "Galvalume Steel Sheet" (registered trademark)) which is used for repairing the roof 10.

[Other uses]
This sheet 2 can contribute to the repair or reinforcement of structures other than the roof 10. Examples of structures other than the roof 10 include walls, pillars, eaves, fences, gates, doors, parapets, copings, etc. of houses. This sheet 2 may also be used in commercial buildings, factories, warehouses, bridges, sewage facilities, railway facilities, tunnels, etc.

[Repair and reinforcement]
After a structure (roof, etc.) is repaired or reinforced with this sheet 2, the sheet 2 or the structure may be damaged or deteriorated due to aging. A newly prepared sheet 2 for structures may be applied to the damaged or deteriorated area to repair or reinforce it again. By overlapping the sheets 2, the value of the structure can be preserved and maintained for an extremely long period of time. Re-repair and major reinforcement with this sheet 2 can reduce the generation of waste. This sheet 2 can help realize a circular economy.

In this way, the method of repairing or reinforcing a structure using the sheet 2 of the present disclosure can be said to be the following first method. The first method is a method of repairing or reinforcing a structure using the sheet 2 for structures, and comprises the following steps (1a) and (2a). That is, the method includes the steps of (1a) preparing a sheet 2 having a rectangular shape with short sides of 50 mm and long sides of 100 mm (sheet 2 corresponding to test piece 24) by bending a pair of short sides on the same surface so that they overlap each other, and by gripping and fixing a pair of regions of the sheet 2 from the edges of the pair of short sides to a position 15 mm away along the long side with a fixture 30 of a test device, forming a curved portion 34 with a circumference of 70 mm between the pair of regions of the sheet 2, such that the energy of a 20 mm compressive deformation of the curved portion 34 at 60°C is 2.0 mJ or more and the energy of a 20 mm compressive deformation of the curved portion 34 at -10°C is 60.0 mJ or less, and the sheet 2 has a functional layer 4 and an adhesive layer 8, and (2a) attaching the sheet 2 to the surface of a structure by the adhesive force of the adhesive layer 8.

As another example, the method of re-repairing or re-reinforcing a structure disclosed herein can also be referred to as the second method below. That is, the second method can also be a method of re-repairing or re-reinforcing using two structural sheets 2 (hereinafter also referred to as the "first sheet 2a" and the "second sheet 2b"). This method is a method of re-repairing or re-reinforcing a structure that has been repaired or reinforced with the first sheet 2a with the second sheet 2b, and includes the following steps (1b) to (4b).

Specifically, the second method includes the steps of (1b) curving a rectangular first sheet 2a with short sides of 50 mm and long sides of 100 mm so that a pair of short sides on the same surface overlap each other, and gripping and fixing a pair of regions of the first sheet 2a from the edges of the pair of short sides to a position 15 mm away along the long side with a fixture 30 of a testing device to form a curved portion 34 with a circumference of 70 mm between the pair of regions of the first sheet 2a, such that the energy of a 20 mm compressive deformation of the curved portion 34 of the first sheet 2a at 60°C is 2.0 mJ or more and the energy of a 20 mm compressive deformation of the curved portion 34 of the first sheet 2a at -10°C is 60.0 mJ or less, and the first sheet 2a has a functional layer 4 and an adhesive layer 8.

The second method further includes a step (2b) of attaching the first sheet 2a to the surface of the structure by the adhesive force of the adhesive layer 8 of the first sheet 2a. The method further includes (3b) preparing a second sheet 2b having a rectangular shape with short sides of 50 mm and long sides of 100 mm, by bending the pair of short sides of the same surface so that they overlap each other, and by gripping and fixing a pair of regions of the second sheet 2b from the edge of the pair of short sides to a position 15 mm away along the long side with a fixture 30 of a testing device, forming a curved portion 34 with a circumference of 70 mm between the pair of regions of the second sheet 2b, in which the energy of a 20 mm compressive deformation of the curved portion 34 of the second sheet 2b at 60°C is 2.0 mJ or more and the energy of a 20 mm compressive deformation of the curved portion 34 of the second sheet 2b at -10°C is 60.0 mJ or less, and the second sheet 2b has a functional layer 4 and an adhesive layer 8, and (4b) attaching the second sheet 2b to the damaged or deteriorated surface of the first sheet 2a by the adhesive force of the adhesive layer 8 of the second sheet 2b.

[Second embodiment]
[Layer structure]
FIG. 12 shows a structure sheet 40 according to the second embodiment. The sheet 40 has a functional layer 42, an intermediate layer 44, an adhesive layer 46, and a reinforcing body 48. The reinforcing body 48 is embedded in the intermediate layer 44. The material, thickness, and other configurations of the functional layer 42 are the same as those of the functional layer 4 shown in FIG. 3. The material, thickness, and other configurations of the adhesive layer 46 are the same as those of the adhesive layer 8 shown in FIG. 3. The sheet 40 is attached to a structure. The sheet 40 may have a release paper or a release film. The release paper and the release film are laminated with the adhesive layer 46.

[Compressive deformation energy]
The energy E1 of the sheet 40 for compressive deformation of 20 mm at 60° C. is preferably 2.0 mJ or more. When repairing a roof, a worker lifts the sheet 40 with his/her hands. At this time, gravity is applied to the sheet 40. The sheet 40 deforms due to its own weight. This deformation causes the sheet 40 to hang down from the worker's hand. In the sheet 40 with the energy E1 of 2.0 mJ or more, deformation when gravity is applied can be suppressed. The sheet 40 is easy for a worker to handle. In the sheet 40, deformation can be suppressed even in a high temperature environment such as in summer. From the viewpoint of suppressing deformation, the energy E1 is more preferably 3.0 mJ or more, even more preferably 6.0 mJ or more, and particularly preferably 9.5 mJ or more.

The energy E2 of this sheet 40 for a compressive deformation of 20 mm at -10°C is preferably 60.0 mJ or less. As described above, the sheet 40 curves near steps. A sheet 40 with an energy E2 of 60.0 mJ or less can conform well to steps. When repairing a roof with this sheet 40, spaces are unlikely to form between the sheet 40 and the roof. This sheet 40 exhibits excellent conformability even in low-temperature environments such as winter. From the viewpoint of conformability, the energy E2 is more preferably 57.1 mJ or less, and particularly preferably 44.7 mJ or less. The energies E1 and E2 are measured in the same manner as described above for the first embodiment.

[Middle layer]
The intermediate layer 44 is disposed between the functional layer 42 and the adhesive layer 46. The intermediate layer 44 includes a reinforcing body 48. The material of the intermediate layer 44 (the material of the portion excluding the reinforcing body 48) is the same as the material of the intermediate layer 6 shown in FIG. 3. In FIG. 12, the arrow T2 indicates the thickness of the intermediate layer 44. In this embodiment, the thickness T2 is measured including the reinforcing body 48. From the viewpoint of the handleability of the sheet 40, the thickness T2 is preferably 100 μm or more, more preferably 200 μm or more, and particularly preferably 300 μm or more. From the viewpoint of the followability, productivity, and light weight of the sheet 40, the thickness T2 is preferably 1500 μm or less, more preferably 1200 μm or less, and particularly preferably 700 μm or less.

From the viewpoint of the ease of handling of the sheet 40, the ratio of the thickness T2 of the intermediate layer 44 to the total thickness Tt of the sheet 40 is preferably 30% or more, more preferably 45% or more, and particularly preferably 55% or more. From the viewpoints of the conformability, productivity, and light weight of the sheet 40, this ratio is preferably 85% or less, more preferably 75% or less, and particularly preferably 70% or less.

[Reinforcement body]
The reinforcing body 48 can contribute to the rigidity of the sheet 40. The sheet 40 including the reinforcing body 48 has excellent handleability. As described above, the reinforcing body 48 is embedded in the intermediate layer 44. The reinforcing body 48 may be embedded in the functional layer 42. The reinforcing body 48 may be embedded in the adhesive layer 46. The reinforcing body 48 may be located between the functional layer 42 and the intermediate layer 44. The reinforcing body 48 may be located between the intermediate layer 44 and the adhesive layer 46.

The reinforcing body 48 in this embodiment is, as an example, a mesh. FIG. 13 shows the reinforcing body 48 which is a mesh. In this reinforcing body 48, a plurality of warp threads 50a and a plurality of weft threads 50b are woven. In other words, the reinforcing body 48 is a fabric (woven material) and has a biaxial woven structure in which the fibers of the warp threads 50a and the weft threads 50b are arranged in a lattice pattern. In this embodiment, this fabric has a plain weave structure. The reinforcing body 48 which is a fabric can be impregnated with the composition of the intermediate layer 44. This impregnation suppresses peeling between the reinforcing body 48 and the intermediate layer 44.

Instead of a mesh, the reinforcing body 48 may contain long fibers, short fibers, nonwoven fabric, resin film, or metal foil. Among these, the resin film may be, for example, a biaxially stretched film. When the intermediate layer 44 is manufactured, the reinforcing body 48 is pressed against the coating of the composition of the intermediate layer 44 before the coating dries, thereby obtaining the intermediate layer 44 including the reinforcing body 48.

The shape of the reinforcing body 48 is not particularly limited. When the reinforcing body 48 is a mesh, the shape can be any shape, such as a biaxial woven structure or a triaxial woven structure. Examples of the material of the reinforcing body 48 include a synthetic resin composition and a metal.

Preferred base resins for the synthetic resin composition include polyethylene terephthalate, polyethylene naphthalate, aramid, vinylon, polypropylene, polystyrene, and polyvinylidene fluoride. Preferred metals include aluminum alloys, carbon steel, and alloy steel. By using warp threads 50a and weft threads 50b with high tensile strength, a sufficiently large energy E3 (described in detail later) can be achieved. Alternatively, the reinforcing body 48 is preferably a mesh material such as a high-strength vinylon mesh (for example, for civil engineering applications) or a cheesecloth made of vinylon (for example, for agricultural applications), polyester, polyvinyl alcohol, or the like. These reinforcing bodies 48 can easily widen the elastic range of the structural sheet 40. They can also easily impart appropriate rigidity to the structural sheet 40. Furthermore, the handleability of the structural sheet 40 can be improved.

For example, the line pitch of the reinforcement 48 is preferably 50 mm or more and 1.2 mm or less. In other words, for example, the line density of the reinforcement 48 is preferably 0.2 lines/cm or more and 8.0 lines/cm or less. Such a reinforcement 48 can easily impart rigidity to the structural sheet 40 while ensuring the tensile strength of the structural sheet 40.

The reinforcing body 48 may be, for example, large enough to cover the entire surface of the intermediate layer 44 when the intermediate layer 44 is viewed in a plan view, or may be smaller than the intermediate layer 44. In other words, the area of the reinforcing body 48 when viewed in a plan view may be equal to or smaller than the area of the intermediate layer 44 when viewed in a plan view.

The area of the reinforcement 48 when viewed in a plane (plan view area) is preferably, for example, 60% to 95% of the plan view area of the intermediate layer 44. If the plan view area of the reinforcement 48 is 60% or more, for example, it is easier to ensure the rigidity of the structural sheet 40 and to control the elongation rate of the structural sheet 40. In addition, it is easier to suppress the variation in rigidity in different regions of the structural sheet 40. In addition, if the plan view area of the reinforcement 48 is 95% or less, for example, when the intermediate layer 44 is formed so as to sandwich the reinforcement 48 in the thickness direction of the structural sheet 40, it is easier to ensure the adhesive strength of the reinforcement 48 to the intermediate layer 44 throughout the entire intermediate layer 44. The plan view area of the reinforcement 48 can be measured by a known method.

The thickness of the reinforcement 48 is, for example, 10% or more of the thickness of the intermediate layer 44. The thickness of the reinforcement 48 is, for example, preferably 20% or more of the thickness of the intermediate layer 44, more preferably 30% or more, particularly preferably 40% or more, and most preferably 50% or more. On the other hand, the thickness of the reinforcement 48 is, for example, 80% or less of the thickness of the intermediate layer 44. The thickness of the reinforcement 48 is, for example, preferably 70% or less of the thickness of the intermediate layer 44, more preferably 60% or less, and particularly preferably 55% or less. Setting the thickness of the intermediate layer 44 in this way makes it easier to impart appropriate rigidity to the structural sheet 40.

Furthermore, by setting the thickness of the reinforcing body 48 and the thickness of the intermediate layer 44 to have the above-mentioned relationship, the structural sheet 40 of the present disclosure can be configured to have excellent adhesion between the adhesive layer 46 and the intermediate layer 44 and appropriate rigidity. Therefore, excellent handleability is obtained when attaching the structural sheet 40 to the roof of the structure, etc., and the structural sheet 40 can protect the structure for a long period of time without causing wrinkles or gaps with the roof of the structure, etc. For example, the lower limit of the thickness of the reinforcing body 48 relative to the thickness of the intermediate layer 44 is preferably 45%, and the upper limit of this thickness is preferably 55%.

The reinforcing body 48 may include structures other than the fabric as well as the fabric. Examples of structures in this case include long fibers, short fibers, resin films, metal foils, and nonwoven fabrics.

[Compressive deformation energy E3]
Here, when the reinforcing body 48 is in the form of a sheet, the reinforcing body 48 is in the form of a rectangular sheet having a short side of 50 mm and a long side of 100 mm, and is curved so that a pair of short sides of the same surface overlap each other, and a pair of regions of the reinforcing body 48 from the edge of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a test device, so that a curved portion having a circumference of 70 mm is formed between the pair of regions of the reinforcing body 48. In this state, the energy E3 of the curved portion of the reinforcing body 48 for a compression deformation of 20 mm at 23 ° C. is preferably 1.5 mJ or more. In the sheet 40 including the reinforcing body 48 having an energy E3 of 1.5 mJ or more, a large energy E1 can be achieved. This sheet 40 has excellent handleability. From this viewpoint, the energy E3 is more preferably 2.0 mJ or more, and particularly preferably 2.0 mJ or more.

This energy E3 is preferably 10 mJ or less. A sheet 40 including a reinforcing body 48 with an energy E3 of 10 mJ or less can achieve a small energy E2. This sheet 40 has excellent conformability. From this viewpoint, the energy E3 is more preferably 8 mJ or less, and particularly preferably 6 mJ or less.

This energy E3 is measured in the same manner as described above for the compressive deformation energies E1 and E2. A test piece having sides the same length as the short side 26 and long side 28 shown in FIG. 7 is cut out from the reinforcement 48 and subjected to measurement. The device shown in FIGS. 8-10 is used for the measurement. The energy E3 is calculated by the above formula (1). The energy E3 is measured in an environment of 23°C.

[fabric]
In Fig. 13, the arrow D1 indicates the thickness of the thread 50. A large energy E1 can be achieved by a thread 50 having a large thickness D1. A small energy E2 can be achieved by a thread 50 having a small thickness D1. In Fig. 13, the arrow P1 indicates the pitch of the thread 50. A large energy E1 can be achieved by a reinforcing body 48 having a small pitch P1. A small energy E2 can be achieved by a reinforcing body 48 having a large pitch P1.

[Production method]
Before the coating for the intermediate layer 44 dries, the reinforcing body 48 is pressed against the coating, thereby obtaining a sheet 40 including the reinforcing body 48 embedded in the intermediate layer 44 .

[Application]
This sheet 40 is suitable for repairing roofs, similar to the sheet 2 shown in Fig. 1-3. This sheet 40 can also be used for residential walls, pillars, eaves, fences, gates, doors, parapets, copings, etc., similar to the sheet 2 shown in Fig. 1-3. This sheet 40 may also be used for commercial buildings, factories, warehouses, bridges, sewage facilities, railway facilities, tunnels, etc.

[density]
The density of the sheet 40 is preferably 4.0 g/cm ³ or less, more preferably 3.0 g/cm ³ or less, and particularly preferably 2.5 g/cm ³ or less.

<Other supplementary information>
Other supplementary points will be described below. Although the structural sheet 2 will be exemplified below, the following supplementary points can also be applied to other structural sheets of the present disclosure.
[On the rigidity of structural sheets]
From the viewpoint of ensuring ease of handling when applied to a structure, the structure sheet 2 preferably has a rigidity that can withstand folding. For this reason, for example, the structure sheet 2 may be configured so that at least one of the first layer arranged on the application surface side and the second layer arranged on the opposite side to the application surface has a predetermined rigidity. Alternatively, the structure sheet 2 may be configured to include the first layer arranged on the application surface side, the second layer arranged on the opposite side to the application surface, and a third layer arranged between the first layer and the second layer, and the third layer has a predetermined rigidity. The following is a detailed explanation.

The first layer arranged on the attachment surface side of the structure sheet 2 can be an adhesive layer 8. An example of a method for imparting rigidity to the adhesive layer 8 is a method in which the adhesive layer 8 is configured to include an adhesive and a filler. In this case, the adhesive layer 8 includes an adhesive that has a relatively low glass transition temperature (Tg) such as acrylic, silicone with siloxane bonds, rubber, or urethane, and can utilize van der Waals forces or electrostatic forces, and a filler such as silica, alumina, titanium oxide, calcium carbonate, or carbon black. For example, the rigidity of the adhesive layer 8 can be controlled by adjusting at least one of the amount of filler added to the adhesive layer 8 and the particle shape of the filler. Specific examples of the particle shape of the filler include spherical, needle-like, amorphous, and tetrapod-like shapes. In addition, the rigidity of the structure sheet 2 can be controlled by adjusting the thickness of the functional layer 4. In addition, the rigidity of the structure sheet 2 can be controlled by adjusting the Tg of the adhesive in the functional layer 4.

The layer arranged on the surface side of the structure sheet 2, i.e., the second layer arranged on the opposite side to the attachment surface of the structure sheet 2, can be exemplified by the functional layer 4. As a method for imparting rigidity to the functional layer 4, a method of configuring the functional layer 4 to include a main material and a filler can be exemplified. In this case, the functional layer 4 includes a main material such as acrylic silicone, fluororesin, silicone resin, non-diene rubber, etc., and a filler such as silica, alumina, titanium oxide, calcium carbonate, carbon black, etc. For example, the rigidity of the functional layer 4 can be controlled by adjusting at least one of the amount of filler added to the functional layer 4 and the particle shape of the filler. Specifically, examples of the particle shape of the filler include spherical, needle-like, amorphous, and tetrapod-like shapes. In addition, the rigidity of the structure sheet 2 can be controlled by adjusting at least one of the thickness of the functional layer 4 and the Tg of the main material of the functional layer 4. In this way, in the structure sheet 2, at least one of the adhesive layer 8 and the functional layer 4 may include a filler.

In a structural sheet 2 that is configured to have a first layer (e.g., adhesive layer 8) arranged on the side to be attached, a second layer (e.g., functional layer 4) arranged on the side opposite the side to be attached, and a third layer arranged between the first and second layers, and in which the third layer is configured to have a predetermined rigidity, one method of imparting rigidity to the third layer is, for example, to configure the third layer as an intermediate layer 6 described below, and to impart rigidity to the intermediate layer 6.

Furthermore, the rigidity of the structural sheet 2 can be controlled by adjusting the Tg of the resin component contained in the intermediate layer 6. The rigidity of the structural sheet 2 can also be controlled by adjusting the amount of voids or the diameter of the voids in the intermediate layer 6. Furthermore, when the structural sheet 2 has multiple intermediate layers 6, it may have, for example, a first intermediate layer 6 containing a resin component whose Tg is a predetermined value, and a second intermediate layer 6 containing a resin component whose Tg is lower than that of the resin component contained in the first intermediate layer 6.

From the viewpoint of ensuring the rigidity of the structural sheet 2, the thickness of the intermediate layer 6 is, for example, 100 μm or more. The thickness of the intermediate layer 6 is, for example, preferably 200 μm or more, more preferably 300 μm or more, and most preferably 350 μm or more. On the other hand, taking into consideration productivity and the like, the thickness of the intermediate layer 6 is, for example, 1500 μm or less. The thickness of the intermediate layer 6 is preferably 1200 μm or less, more preferably 1000 μm or less, and most preferably 750 μm or less. In this way, by appropriately adjusting the thickness of the intermediate layer 6, appropriate rigidity of the structural sheet 2 can be obtained.

When a resin component, a mortar component, and a reinforcing body 48 are used as materials for the intermediate layer 6, as a specific example, the resin component can be a Spring Coat (Brush) mixture liquid manufactured by Kikusui Chemical Industry Co., Ltd., and the mortar component can be a Spring Coat (Brush) powder manufactured by Kikusui Chemical Industry Co., Ltd., and the reinforcing body 48 (mesh component) can be a vinylon mesh material manufactured by Unitika Co., Ltd. (cheesecloth (BINEO (registered trademark) "V520")).

[Details of reinforcing material]
In order to control the internal structure of the sheet for structure 2, as described above, it is preferable to dispose a reinforcing body 48 inside the intermediate layer 6. In this case, the internal structure of the sheet for structure 2 can be controlled by changing the content of the reinforcing body 48 in the intermediate layer 6. Furthermore, when the sheet for structure 2 has a plurality of layers, the sheet for structure 2 may have a reinforcing body 48 of a layered structure disposed inside. In this case, the reinforcing body 48 of the layered structure imparts a predetermined rigidity to the sheet for structure 2, thereby making it possible to control the internal structure of the sheet for structure 2.

When the structural sheet 2 contains a filler for adjusting strength, specific methods for imparting rigidity to the structural sheet 2 include, for example, controlling at least one of the filler material, the amount of filler added to the structural sheet 2, and the size and shape of the filler particles. In this case, the filler material may be either an inorganic material or an organic material, or a mixture of inorganic and organic materials.

When the reinforcing body 48 includes a nonwoven fabric, the nonwoven fabric is not particularly limited as long as it is a nonwoven fabric formed into a sheet shape without weaving fibers. Examples of fibers constituting the nonwoven fabric include at least one of natural fibers and chemical fibers. Examples of chemical fibers include fibers made of polyolefin resins such as polypropylene and polyethylene, polyester resins, polyacrylic resins, and polyamide resins such as nylon, as well as copolymers and modified products of these resins, and synthetic fibers made of combinations of these. Among these, polyester fibers, for example, are preferred as fibers with excellent water resistance, heat resistance, dimensional stability, weather resistance, etc.

As a specific method for imparting rigidity to the sheet for structure 2, the thickness of the sheet for structure 2 may be controlled. In the case of a sheet for structure 2 having an intermediate layer 6, the rigidity of the sheet for structure 2 can also be controlled by adjusting the viscoelasticity of the intermediate layer 6. In this case, the viscoelasticity of the intermediate layer 6 may be adjusted by adjusting the glass transition temperature (Tg, hereinafter also simply referred to as Tg) of the resin contained in the intermediate layer 6 or by changing the degree of crosslinking of the resin. In this way, various methods can be used to control the rigidity of the sheet for structure 2.

<Other embodiments>
Further configurations of the structure sheet of the present disclosure will be illustrated below. Fig. 14 is a cross-sectional configuration diagram that shows a structure sheet 61 according to a fourth embodiment. When the above-mentioned release film 9 is the first release film 9, the structure sheet 61 of this embodiment includes a second release film 17 arranged on the opposite side of the adhesive layer 58 of the functional layer 54. As an example, the structure sheet 61 has the first release film 9, the adhesive layer 58, the intermediate layer 56, the functional layer 54, and the second release film 17 arranged in this order in the thickness direction.

The second release film 17 is configured so that when the surface 17a exposed to the outside comes into contact with the surface 9a exposed to the outside of the first release film 9, the surfaces 17a and 9a are unlikely to adhere to each other. Therefore, when the structure sheet 61 is unwound from the roll body 71 (see FIG. 17) on which the sheet 61 described below is wound, the first release film 9 can be easily separated from the second release film 17, and the structure sheet 61 can be easily unwound.

The second release film 17 also has a predetermined rigidity. Therefore, the rigidity of the remaining structure sheet 61 after the first release film 9 has been peeled off can be improved. Therefore, even if the rigidity of the remaining structure sheet 61 after the first release film 9 and the second release film 17 have been peeled off is low, the handling when attaching the structure sheet 61 can be improved, and the structure sheet 61 can be easily attached to the surface of the structure. In addition, the remaining structure sheet 61 after the first release film 9 and the second release film 17 have been peeled off can be designed to have a relatively small rigidity. Therefore, for example, even if the shape of the surface of the structure to which the structure sheet 61 is attached is not flat due to unevenness or height differences caused by defects, the structure sheet 61 can be attached by following the surface well. In addition, for example, the anchor effect on the surface can be improved, so that the adhesive force of the structure sheet 61 can be sufficiently improved within an allowable range.

The structure of the second release film 17 can be set as appropriate. For example, as shown in FIG. 14, the second release film 17 has a contact layer 11 that contacts the first release film 9 when the structure sheet 61 is wound into a roll, and a weak adhesive layer 13 that is disposed on the first release film 9 side of the contact layer 11 when the structure sheet 61 is disposed flat.

The contact layer 11 may be composed of a single layer or multiple layers. The contact layer 11 may also contain a resin. In other words, the contact layer 11 may be a resin layer. Examples of resins contained in the contact layer 11 include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefins such as polyethylene, polypropylene, and polymethylpentene, polyamides such as nylon 6 and aramid, vinyl resins such as polyvinyl chloride, acrylic resins such as polymethyl methacrylate, cellulose resins such as cellulose acetate, synthetic resins such as polycarbonate, and urethane.

Alternatively, the contact layer 11 may be a fiber layer containing a fiber component and a binder component that binds the fiber component. Alternatively, the contact layer 11 may contain paper. In this case, the contact layer 11 may contain paper as a main component, or may contain paper together with a predetermined main component. When the contact layer 11 contains paper, the contact layer 11 preferably contains paper having a strength such that the contact layer 11 is not accidentally torn when the structural sheet 61 is attached to the construction target. When the contact layer 11 contains paper, the contact layer 11 preferably contains, for example, silicone having a siloxane bond together with paper. The contact layer 11 has a higher rigidity than, for example, the remaining portion of the structural sheet 61 from which the release film 9 and the second release film 17 are omitted and from which the contact layer 11 and the weak adhesive layer 13 are omitted.

The thickness of the contact layer 11 can be set appropriately, but is, for example, from 20 μm to 500 μm. If the contact layer 11 contains polyethylene terephthalate (PET), the thickness of the contact layer 11 is preferably, for example, from 20 μm to 50 μm.

The weak adhesive layer 13 has a relatively low adhesive strength. For example, the adhesive strength of the weak adhesive layer 13 to the functional layer 54 is lower than the adhesive strength of the adhesive layer 58 to the intermediate layer 56. Also, for example, the adhesive strength of the weak adhesive layer 13 to the contact layer 11 is higher than the adhesive strength of the weak adhesive layer 13 to the functional layer 54. The weak adhesive layer 13 may be attached to the functional layer 54 by, for example, static electricity. The weak adhesive layer 13 may contain a main component whose Tg is substantially 0. The weak adhesive layer 13 may contain, for example, ethylene vinyl acetate (EVA), urethane, silicone having a siloxane bond, acrylic, etc. The second release film 17 is not limited to the above-mentioned configuration, and may be, for example, a base film 39 described later.

FIG. 15 is a cross-sectional view showing a schematic diagram of a structure sheet 62 according to a fifth embodiment. The structure sheet 62 of this embodiment includes a release sheet 29 arranged on the side of the functional layer 54 opposite the adhesive layer 58. As an example, the structure sheet 62 has the adhesive layer 58, intermediate layer 56, functional layer 54, and release sheet 29 arranged in this order in the thickness direction. In the structure sheet 62 of this embodiment, the release film 9 is omitted.

The release sheet 29 contains a surface 29a exposed to the outside and a release agent disposed in the vicinity thereof. An example of a release agent is silicone having a siloxane bond. This makes it difficult for the surface 29a and the attachment surface 58a to adhere to each other when the surface 29a exposed to the outside of the release sheet 29 comes into contact with the attachment surface 58a of the adhesive layer 58 in the roll body 71. Therefore, when the structure sheet 62 is unwound from the roll body 71, the adhesive layer 58 can be easily peeled off from the release sheet 29, and the structure sheet 62 can be easily unwound.

In this manner, in the present disclosure, when the structure sheet 62 is unwound from the roll 71, the structure sheet 62 may be preliminarily made easy to unwound from the roll 71 so that, for example, the portion of the structure sheet 62 on which the adhesive component is provided does not adhere to other portions of the structure sheet 62 and make it difficult to remove. The release sheet 29 also has a predetermined rigidity. Therefore, in this embodiment, even if the release film 9 is omitted, the rigidity of the structure sheet 2 can be improved. Therefore, the handleability of the structure sheet 62 is improved, and the structure sheet 62 can be easily affixed to the target of the structure. In this case, the release sheet 29 has a higher rigidity than the remaining structure sheet 62 from which the release sheet 29 has been peeled off.

The structure of the release sheet 29 can be set as appropriate. For example, as shown in FIG. 15, the release sheet 29 has a release intermediate layer 15 having a surface 29a that contacts the attachment surface 58a of the adhesive layer 58 when the structural sheet 62 is wound into a roll, and a weak adhesive layer 13 that is disposed on the adhesive layer 58 side of the release intermediate layer 15 when the structural sheet 62 is disposed flat. The release intermediate layer 15 may have a similar structure to the contact layer 11, except that it contains a release agent. The release sheet 29 may also have a release agent layer disposed over the surface 29a.

FIG. 16 is a cross-sectional view showing a schematic diagram of a structural sheet 63 according to a sixth embodiment. The structural sheet 63 of this embodiment has a base film 39 arranged on the side opposite the adhesive layer 58 of the functional layer 54 when laid flat. The base film 39 is the base film used when forming the functional layer 4 described above. The structural sheet 63 of this embodiment has the base film 39, which is not peeled off even after the functional layer 54 is formed.

As an example, the structure sheet 63 has the release film 9, adhesive layer 58, intermediate layer 56, functional layer 54, and base film 39 arranged in this order in the thickness direction. The surface 39a exposed to the outside of the base film 39 and the surface 9a exposed to the outside of the release film 9 are configured so as not to adhere to each other when they come into contact with each other. Therefore, when the structure sheet 63 is unwound from the roll body 71, the structure sheet 2 can be easily unwound. The base film 39 also has a predetermined rigidity. In this case, the base film 39 has a higher rigidity than the remaining structure sheet 63 from which the release film 9 and base film 39 have been peeled off. Therefore, in the remaining structure sheet 63 from which the release film 9 has been peeled off, the rigidity of the structure sheet 63 can be improved by the base film 39. Therefore, even if the stiffness of the remaining structural sheet 63 after the first release film 9 and base film 39 are peeled off is low, the handleability of the structural sheet 63 can be improved and the structural sheet 63 can be easily attached to the target structure.

The base film 39 may contain a resin laminated paper that has pseudo-adhesion, which means that once two components that have been attached to each other are peeled off, they cannot be bonded again. In this case, for example, the base film 39 may contain a resin laminated paper in which a resin layer and paper are laminated together, and the resin layer and the paper are bonded to each other by pseudo-adhesion in the resin laminated paper. With this configuration, when the paper in the resin laminated paper is peeled off from the resin layer while the resin layer is attached to the functional layer 54, only the paper is peeled off and removed, and the resin layer remains attached to the functional layer 54 of the structural sheet 63.

Next, in the fourth to sixth embodiments, a construction method for reinforcing or repairing a structure by attaching the structural sheets 61 to 63 to the structure is illustrated. In this construction method, the worker unrolls the structural sheets 61 to 63 of the required length from the roll body 71. Next, in the fourth and sixth embodiments, the worker peels off the release film 9 of the structural sheet 2 and attaches the exposed attachment surface 58a of the adhesive layer 58 to the surface of the structure to be attached. At this time, the worker may peel off the release film 9 little by little from the structural sheet 2 and attach the exposed attachment surface 58a of the adhesive layer 58 to the surface of the structure to be attached. On the other hand, in the fifth embodiment, the worker attaches the attachment surface 58a of the adhesive layer 58 of the structural sheet 2 to the surface of the structure to be attached.

In the fourth to sixth embodiments, the worker then applies the structural sheet 2 to the target, and then peels and removes the corresponding second release film 17, release sheet 29, or base film 39 from the structural sheet 2.

That is, the construction method according to the fourth to sixth embodiments includes a preparation step of preparing a roll body 71 in which the structural sheet 2 is wound into a roll, a payout step of paying out the structural sheet 2 from the roll body 71, and a sticking step of peeling the first release film 9 from the paid out structural sheet 2 and sticking the exposed sticking surface to the surface of the structure. Here, in the preparation step of the fourth and sixth embodiments, the roll body 71 is prepared using the structural sheet 2 whose sticking surface 58a is covered with the first release film 9.

In addition, in this construction method, the structural sheet 2 in the roll body 71 prepared in the preparation step has a laminated structure including a functional layer 54 and an adhesive layer 58, and a cover sheet is disposed on the side of the functional layer 54 opposite the adhesive layer 58 side. In the roll body 71, the structural sheet 2 including this cover sheet is wound in a roll shape, and the cover sheet may be peeled off and removed during or after the attachment step. This cover sheet may be any one of the second release film 17, the release sheet 29, and the base film 39.

In addition, in the construction method of the fourth embodiment, the structural sheet 2 of the roll body 71 prepared in the preparation step has a laminated structure including the functional layer 54 and the adhesive layer 58, and has a release sheet 29 that is disposed on the opposite side of the functional layer 54 from the adhesive layer 58 side and is separate from the release film 9, and in the preparation step, the roll body 71 may be prepared in which the structural sheet 2 is wound into a roll so that the release sheet 29 is in contact with the adhesive layer 58.

When using the structural sheet 2 of the present disclosure, for example, the supply item 65 shown below can be used. FIG. 17 is a schematic diagram showing the structure of a supply item 65 containing the structural sheet 2 of the present disclosure. FIG. 17 shows, as an example, a structural sheet 2 with a release film 9. The supply item 65 shown in FIG. 17 includes a roll 71 on which a strip-shaped structural sheet 2 is wound, and a container 70 having a storage space 70a for storing the roll 71. The container 70 has a supply port 70b that can unwind and supply the structural sheet 2 from the roll 71 stored in the storage space 70a to the outside. The supply port 70b has a width dimension equal to or greater than the width dimension of the structural sheet 2 in the axial direction of the roll 71.

For example, a worker can bring the supply item 65 to a construction site, unroll the required length of the structural sheet 2 from the supply item 65, and use the structural sheet 2 for construction. Therefore, the supply item 65 allows the structural sheet 2 to be stored in the form of a roll 71 suitable for storage. Furthermore, when the structural sheet 2 is to be used, only the required amount can be unrolled from the supply item 65. This improves work efficiency.

When the worker unrolls the structural sheet 2 from the supply port 70b, the worker can unroll the structural sheet 2 while applying uniform tension to the entire widthwise area of the structural sheet 2, for example, by pressing the entire widthwise area of the structural sheet 2 against the opening periphery of the supply port 70b. This allows the structural sheet 2 to be attached to the surface of the structure with uniform tension. Therefore, it is possible to prevent the structural sheet 2 from being subjected to uneven tension after application, which would cause unexpected contraction or expansion of the structural sheet 2 after application. Note that in order to apply uniform tension to the entire widthwise area of the structural sheet 2, a separate member such as a long member that extends in the widthwise direction of the structural sheet 2 and comes into contact with the structural sheet 2 may be placed, for example, on the opening periphery of the supply port 70b.

The structure sheet provided in the supply item 65 may be any structure sheet disclosed herein, for example, the structure sheet 2 of any of the fourth to sixth embodiments, or the structure sheet 2 of any other embodiment.

<Example>

The effects of the structural sheet according to the embodiment will be explained below. The scope of the disclosure in this specification should not be interpreted in a limited manner based on the description of this embodiment.

[Example 1]
A 130 μm thick base film was prepared, which was a PP laminate sheet manufactured by Lintec Corp. A weather-resistant layer-forming composition containing an acrylic resin (a mixture of Cool Life SP Black (CB1) P5-0 manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd. and FC Coat Elastic Black manufactured by Fujikura Kasei Co., Ltd. in a mass ratio of 50:50) was applied onto the base film. The formed coating film was dried to form a single-layer functional layer having a thickness of 110 μm.

Next, a mixture of the polymer-forming composition (Kikusui Chemical Industry Co., Ltd., Spring Coat Brush Mixture) that constitutes the intermediate layer and a cement-containing composition (Kikusui Chemical Industry Co., Ltd., Spring Coat Brush Powder) was mixed in a ratio of 22:78 to prepare a mixture. This mixture was applied onto the functional layer. A reinforcing material (Unitika Ltd., cheesecloth (BINEO "V520")) was placed so as to be pressed against the surface of the coating of this mixture. This allowed the coating to harden, forming an intermediate layer on top of the functional layer that was 450 μm thick after hardening and had a mass ratio of polymer to filler (cement-containing material) solids of 12:88.

Meanwhile, 100 parts by mass of an acrylic adhesive (Olivine BPS6574) manufactured by Toyochem Co., Ltd. was mixed with 6 parts by mass of an isocyanate curing agent (BHS8515) manufactured by Toyochem Co., Ltd. to prepare an adhesive mixture. This adhesive mixture was applied to the surface of a release sheet and dried to form an adhesive layer with a thickness of 100 μm. The adhesive layer was then layered on and adhered to the intermediate layer to produce a structural sheet according to Example 1 with a total thickness of 660 μm.

[Example 2]
A structural sheet of Example 2 having a total thickness of 660 μm was obtained in the same manner as in Example 1, except that no reinforcing member was provided.

[Examples 3 and 4]
Structural sheets of Examples 3 and 4, each having a total thickness of 660 μm, were obtained in the same manner as in Example 1, except that the mass ratio of the solid content of the polymer and the filler (cement-containing material) in the intermediate layer was set as shown in Table 1 below.

[Example 5]
A structural sheet of Example 5 having a total thickness of 660 μm was obtained in the same manner as in Example 1, except that no reinforcing body was provided and the mass ratio of the solid content of the polymer and the filler (cement-containing material) in the intermediate layer was as shown in Table 1 below.

[Example 6]
A structural sheet of Example 6 having a total thickness of 510 μm was obtained in the same manner as in Example 3, except that the thickness of the intermediate layer was 300 μm.

[Example 7]
A structural sheet of Example 7 having a total thickness of 1,410 μm was obtained in the same manner as in Example 3, except that the thickness of the intermediate layer was 1,200 μm.

[Examples 8 and 9]
Structural sheets of Examples 8 and 9, each having a total thickness of 660 μm, were obtained in the same manner as in Example 1, except that the mass ratio of the solid content of the polymer and the filler (cement-containing material) in the intermediate layer was set as shown in Table 1 below.

[Comparative Example 1]
A structural sheet of Comparative Example 1 having a total thickness of 660 μm was obtained in the same manner as in Example 1, except that a reinforcing body (cheesecloth (BINEO “V510”) manufactured by Unitika Ltd.) having an energy E3 of 12.4 mJ was provided.

[Comparative Example 2]
A structural sheet of Comparative Example 2 having a total thickness of 660 μm was obtained in the same manner as in Example 1, except that the mass ratio of the solid content of the polymer and the filler (cement-containing material) in the intermediate layer was set as shown in Table 1.

For Examples 1 to 9 and Comparative Examples 1 and 2, each structural sheet was curved so that a pair of short sides on the same surface, with short sides of 50 mm and long sides of 100 mm, overlapped each other, and a pair of regions of each structural sheet from the edge of the pair of short sides to a position 15 mm away along the long sides was gripped and fixed with a fixture of the test device to form a curved portion with a circumference of 70 mm between the pair of regions of each structural sheet. In this state, the energy E1 of the compression deformation of the curved portion by 20 mm at 60°C and the energy E2 of the compression deformation of the curved portion by 20 mm at -10°C were measured.

Furthermore, for Examples 1 to 9 and Comparative Examples 1 and 2, each rectangular reinforcement with a short side of 50 mm and a long side of 100 mm was curved so that a pair of short sides on the same surface overlapped each other, and a pair of regions of each reinforcement from the edge of the pair of short sides to a position 15 mm away along the long side was gripped and fixed with a fixture of the testing device to form a curved portion with a circumference of 70 mm between the pair of regions of each reinforcement, and the compressive deformation energy E3 of the curved portion of 20 mm at 23°C was measured. The compressive deformation energies E1 to E3 are shown in Tables 1 and 2 below.

[Easy handling]
A worker was made to apply the structural sheets of Examples 1 to 9 and Comparative Examples 1 and 2 to a roof in a high temperature environment. The worker was asked about the ease of handling. Examples 1 to 9 and Comparative Examples 1 and 2 were rated and evaluated according to the following criteria. Note that, although a structural sheet that can be applied in a relatively long length at once is evaluated as good, in this test, a structural sheet that can be easily applied in multiple relatively short lengths was also evaluated as good.
A: Very good. It is evaluated that the worker can align the structural sheet when applying it without gripping both ends of the sheet in the width direction while continuously pulling the sheet.
B: Good. When applying a relatively long length at once, there is a slight risk that the sheet may be applied in an unintended location due to its own weight. However, the sheet is evaluated as being able to be applied by an operator without gripping it while continuously pulling on both ends of the width direction when aligning the sheet for structural applications.
C: Poor When applying a structural sheet, unless the worker continuously pulls and grips both ends of the sheet in the width direction, the sheet will be applied in an unintended position due to its own weight.
The results are shown in Tables 1 and 2 below.

[Following ability]
A worker was made to apply the structural sheets of Examples 1 to 9 and Comparative Examples 1 and 2 to a step in a low temperature environment. The worker was asked about the conformability. Examples 1 to 9 and Comparative Examples 1 and 2 were rated according to the following criteria.
A: Very good. When a worker applies the structural sheet to an area with a step, the sheet can be applied with simple operation, conforming to the step and without creating any gaps.
B: Good. When a worker applies the structural sheet to a location with a step, the sheet can be applied by following the step and without creating any gaps.
C: Poor When a worker applies the structural sheet to a location with a step, the sheet does not conform to the step and a gap is generated.
The results are shown in Tables 1 and 2 below.

 

 

 

 

As is clear from Tables 1 and 2, Examples 1 to 9 have superior handling and followability compared to Comparative Examples 1 and 2. These evaluation results clearly demonstrate the superiority of the structural sheets of Examples 1 to 9.

[Disclosure items]
Each of the following sections discloses a preferred embodiment.

[Item 1]
A sheet for a structure comprising a functional layer and an adhesive layer,
The structural sheet is rectangular with short sides of 50 mm and long sides of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the structural sheet from the edge ends of the pair of short sides to a position 15 mm away along the long sides are gripped and fixed with a fixture of a testing device, thereby forming a curved portion with a circumference of 70 mm between the pair of regions of the structural sheet.
The energy of compressive deformation of the curved portion at 60° C. for 20 mm is 2.0 mJ or more;
The sheet for structures, wherein the energy of compressive deformation of the curved portion over 20 mm at -10°C is 60.0 mJ or less.
[Item 2]
Item 2. The structure sheet according to item 1, further comprising an intermediate layer located between the functional layer and the adhesive layer.

[Item 3]
3. The structural sheet according to item 2, wherein the material of the intermediate layer is a composite material of a polymer and a filler.

[Item 4]
4. The sheet for structures according to item 3, wherein a mass ratio of solid contents of the polymer and the filler in the composite material is 5/95 or more and 70/30 or less.

[Item 5]
5. The structural sheet according to item 3 or 4, wherein the filler contains a cement component.

[Item 6]
6. The sheet for structures according to any one of items 3 to 5, wherein the filler contains at least one of sand and aggregate constituting mortar.

[Item 7]
7. The structure sheet according to any one of items 2 to 6, wherein the thickness of the intermediate layer is 100 μm or more and 1500 μm or less.

[Item 8]
8. The sheet for a structure according to any one of items 2 to 7, wherein a ratio of a thickness of the intermediate layer to a total thickness of the sheet for a structure is 30% or more and 85% or less.

[Item 9]
The structure sheet according to any one of items 2 to 8, further comprising a reinforcing body.

[Item 10]
Item 10. The structural sheet according to item 9, wherein the reinforcing material is fabric.

[Item 11]
Item 11. The structural sheet according to item 10, wherein the material of the fabric is a synthetic resin composition, and the base resin of the synthetic resin composition is polyethylene terephthalate, polyethylene naphthalate, aramid, vinylon, polypropylene, polystyrene, or polyvinylidene fluoride.
[Item 12]
The reinforcing body is rectangular and sheet-like with short sides of 50 mm and long sides of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the reinforcing body from the edges of the pair of short sides to a position 15 mm away along the long side are grasped and fixed with a fixing device of a testing device, thereby forming a curved portion with a circumference of 70 mm between the pair of regions of the reinforcing body.
Item 12. The structure sheet according to any one of items 9 to 11, wherein the energy of compressive deformation of the curved portion of the reinforcing body over a distance of 20 mm at 23° C. is 1.5 mJ or more.

[Item 13]
Item 13. The structure sheet according to any one of items 1 to 12, wherein at least one of the functional layer and the adhesive layer contains a filler.

[Item 14]

The structural sheet described in any one of items 1 to 13, which is provided with a release film disposed on the surface of the adhesive layer opposite the functional layer.

[Item 15]
A method for repairing or reinforcing a structure using a sheet, comprising:
(1) The rectangular sheet having a short side of 50 mm and a long side of 100 mm is curved so that a pair of short sides on the same surface overlap each other, and a pair of regions of the sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the sheet.
The energy of compressive deformation of the curved portion at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion at −10° C. for 20 mm is 60.0 mJ or less;
and preparing a sheet having a functional layer and an adhesive layer;
and (2) a method for repairing or reinforcing a structure, comprising a step of attaching the sheet to a surface of the structure by the adhesive strength of the adhesive layer.

[Item 16]
A method for re-repairing or re-reinforcing a structure that has been repaired or reinforced with a first sheet, using a second sheet, comprising the steps of:
(1) The first sheet is rectangular with a short side of 50 mm and a long side of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the first sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the first sheet.
The energy of compressive deformation of the curved portion of the first sheet at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion of the first sheet at −10° C. for 20 mm is 60.0 mJ or less;
preparing a first sheet having a functional layer and an adhesive layer;
(2) attaching the first sheet to a surface of the structure by the adhesive force of the adhesive layer of the first sheet;
(3) The second sheet is rectangular with a short side of 50 mm and a long side of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the second sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the second sheet.
The energy of compressive deformation of the curved portion of the second sheet at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion of the second sheet at −10° C. for 20 mm is 60.0 mJ or less,
and preparing a second sheet having a functional layer and an adhesive layer;
and (4) a method for repairing or reinforcing a structure, comprising a step of attaching the second sheet to the damaged or deteriorated surface of the first sheet by using the adhesive strength of the adhesive layer of the second sheet.

The configurations of the present disclosure are not limited to those of the above-mentioned embodiments and examples, and the configurations and methods can be modified, added to, or deleted without departing from the spirit of the present disclosure. Each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. For example, a part of the configuration described in one embodiment or example can be applied to the configuration described in any other embodiment or example.

The structural sheet described above can be attached to various objects for use.

2, 40, 61, 62, 63 Structural sheet 2a First sheet 2b Second sheet 4, 42, 54 Functional layer 6, 44, 56 Intermediate layer 8, 46, 58 Adhesive layer 10 Roof 16 Step 20 Seam 22 Step 24 Test piece 30 Grip (fixing tool)
34 Curved portion 36 Indenter 48 Reinforcement body 50a Warp thread 50b Weft thread

Claims (16)

A sheet for a structure comprising a functional layer and an adhesive layer,
The structural sheet is rectangular with short sides of 50 mm and long sides of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the structural sheet from the edge ends of the pair of short sides to a position 15 mm away along the long sides are gripped and fixed with a fixture of a testing device, thereby forming a curved portion with a circumference of 70 mm between the pair of regions of the structural sheet.
The energy of compressive deformation of the curved portion at 60° C. for 20 mm is 2.0 mJ or more;
The sheet for structures, wherein the energy of compressive deformation of the curved portion over 20 mm at -10°C is 60.0 mJ or less. The structural sheet according to claim 1, further comprising an intermediate layer located between the functional layer and the adhesive layer. The structural sheet according to claim 2, wherein the material of the intermediate layer is a composite material of a polymer and a filler. The structural sheet according to claim 3, wherein the mass ratio of the solid content of the polymer to the filler in the composite material is 5/95 or more and 70/30 or less. The structural sheet according to claim 3, wherein the filler contains a cement component. The structural sheet according to claim 5, wherein the filler contains at least one of sand and aggregate that constitute mortar. The structural sheet according to claim 2, wherein the thickness of the intermediate layer is 100 μm or more and 1500 μm or less. The structural sheet according to claim 2, wherein the ratio of the thickness of the intermediate layer to the total thickness of the structural sheet is 30% or more and 85% or less. The structural sheet according to claim 2, further comprising a reinforcing member. The structural sheet according to claim 9, wherein the reinforcing material is fabric. The structural sheet according to claim 10, wherein the material of the fabric is a synthetic resin composition, and the base resin of the synthetic resin composition is polyethylene terephthalate, polyethylene naphthalate, aramid, vinylon, polypropylene, polystyrene, or polyvinylidene fluoride. The reinforcing body is rectangular and sheet-like with short sides of 50 mm and long sides of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the reinforcing body from the edges of the pair of short sides to a position 15 mm away along the long side are grasped and fixed with a fixing device of a testing device, thereby forming a curved portion with a circumference of 70 mm between the pair of regions of the reinforcing body.
The structural sheet according to claim 9, wherein the energy of compressive deformation of the curved portion of the reinforcing member over a distance of 20 mm at 23° C. is 1.5 mJ or more. The structural sheet according to any one of claims 1 to 12, wherein at least one of the functional layer and the adhesive layer contains a filler. The structural sheet according to any one of claims 1 to 12, comprising a release film disposed on the surface of the adhesive layer opposite the functional layer. A method for repairing or reinforcing a structure using a sheet, comprising:
(1) The rectangular sheet having a short side of 50 mm and a long side of 100 mm is curved so that a pair of short sides on the same surface overlap each other, and a pair of regions of the sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the sheet.
The energy of compressive deformation of the curved portion at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion at −10° C. for 20 mm is 60.0 mJ or less;
and preparing a sheet having a functional layer and an adhesive layer;
and (2) a method for repairing or reinforcing a structure, comprising a step of attaching the sheet to a surface of the structure by the adhesive strength of the adhesive layer. A method for re-repairing or re-reinforcing a structure that has been repaired or reinforced with a first sheet, using a second sheet, comprising the steps of:
(1) The first sheet is rectangular with a short side of 50 mm and a long side of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the first sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the first sheet.
The energy of compressive deformation of the curved portion of the first sheet at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion of the first sheet at −10° C. for 20 mm is 60.0 mJ or less;
preparing a first sheet having a functional layer and an adhesive layer;
(2) attaching the first sheet to a surface of the structure by the adhesive force of the adhesive layer of the first sheet;
(3) The second sheet is rectangular with a short side of 50 mm and a long side of 100 mm, and is curved so that a pair of short sides on the same surface overlap each other. A pair of regions of the second sheet from the edge ends of the pair of short sides to a position 15 mm away along the long side are gripped and fixed with a fixture of a testing device to form a curved portion with a circumference of 70 mm between the pair of regions of the second sheet.
The energy of compressive deformation of the curved portion of the second sheet at 60° C. for 20 mm is 2.0 mJ or more;
The energy of compressive deformation of the curved portion of the second sheet at −10° C. for 20 mm is 60.0 mJ or less,
and preparing a second sheet having a functional layer and an adhesive layer;
and (4) a method for repairing or reinforcing a structure, comprising a step of attaching the second sheet to the damaged or deteriorated surface of the first sheet by using the adhesive strength of the adhesive layer of the second sheet.

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