JP2010090601A - Ventilating buffer sheet for waterproof construction, and waterproof construction roof concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating buffer sheet prevented from the formation of creases in view of a fault of often forming creases on the surface of a waterproof layer 17 when a polyurethane waterproof agent is applied by spraying. <P>SOLUTION: The ventilating buffer sheet 10 for waterproof construction is formed by arranging and integrating an intermediate layer [B]12 between a synthetic resin film layer [A]11 and a nonwoven fabric layer [C]13. The thickness of the layer [A]11 is 10 μm or more, and the layer [C]13 with a unit weight of 100 g/m<SP>2</SP>or more is entangled by needle punching or a fluid entanglement method. The intermediate layer [B]12 includes a glass fiber structure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a waterproof cushioning sheet for waterproofing construction used for waterproofing construction of a coating film and a roof concrete structure to which waterproofing of the coating film is applied.

  As membrane waterproofing work in architectural waterproofing work, paint film waterproofing work, asphalt waterproofing work and sheet waterproofing work are widely implemented.

  In the above-mentioned waterproofing work for the coating film, a primer and an adhesive (or only an adhesive) are applied to the ground surface of concrete and the like, and then a ventilation cushioning sheet is applied, and a waterproofing agent such as polyurethane is further applied to coat the waterproof layer. Is forming.

  The above-mentioned breathable cushion sheet used for waterproofing construction of the coating film is essentially a three-layer structure in which a synthetic resin film layer (middle layer) is sandwiched between a long fiber nonwoven fabric layer (upper layer) and a nonwoven fabric layer (lower layer). A body has been proposed (see Prior Art 1: Patent Document 1, for example). The nonwoven fabric layer (lower layer) functions as a ventilation layer and prevents partial swelling by allowing water vapor generated from the base (for example, concrete) to escape in the horizontal direction. The long-fiber non-woven fabric layer (upper layer) functions to reinforce the waterproof layer while firmly fixing (anchor effect) the waterproof agent layer (waterproof layer) by partially infiltrating the waterproof agent applied thereon. Have The synthetic resin film layer (middle layer) functions as a water shielding layer.

  The present applicant is proposing that a resin film layer such as polyethylene terephthalate (PET) is disposed in place of the long fiber nonwoven fabric layer (upper layer) (prior art 2: Japanese Patent Application No. 2008-18593).

  These waterproof rooftop concrete structures exhibit a predetermined effect.

As a method of applying the waterproofing agent on the air-permeable cushion sheet, in addition to a method of manually applying a liquid (or viscous) polyurethane resin with a brush or a trowel, etc., while mixing polyols with an isocyanate-based prepolymer A method of applying by spraying with a spray gun is known.
Japanese Patent No. 2605893

  However, there was a problem that the surface after the waterproofing agent coating had an appearance defect such as stretch. This wrinkle is not an aesthetic defect, but when the groundwork (for example, concrete) moves due to an earthquake or the like, there is a risk that stress concentrates on the portion of the wrinkle to cause a crack, which is a problem in waterproof function.

  Accordingly, an object of the present invention is to provide a waterproof cushioning sheet that can prevent the generation of wrinkles, and to provide a roof-top concrete structure without wrinkles that has been waterproofed.

  The inventors of the present invention have made various studies to find out the cause of the occurrence of the above-mentioned defects, but they do not generate defects in the case of hand-painting with a brush or the like, but may easily occur when the construction area is large in the case of spraying. I understood.

  The difference between the above two construction environments is that the spray liquid is about 70-80 ° C due to reaction heat in the case of spraying construction, whereas such high temperature is not reached in the hand painting construction. It was considered that the film layer of the ventilation cushioning sheet was extended by being exposed to a high temperature. However, it is difficult to assume that the upper PET film in Prior Art 2 is stretched at about 80 ° C. On the other hand, even if a material that is easily stretched by heat is used as the middle synthetic resin film, the upper PET film is used to synthesize the middle layer. The elongation of the resin film layer will be suppressed. Thus, it cannot be inferred that the film is stretched due to heat during spraying.In the end, the cause of the phenomenon that stretched wrinkles occur in spraying work is not the reason at present. It is still unclear.

  While the present inventors were investigating the cause and were also considering measures for preventing wrinkles, the use of a glass fiber structure such as glass cloth caused the occurrence of wrinkles even when sprayed over a wide area. The knowledge that it can prevent was obtained.

The present invention has been made under such knowledge, and in the waterproof cushioning sheet for waterproof construction according to the present invention, an intermediate layer [B] is disposed between the synthetic resin film layer [A] and the nonwoven fabric layer [C]. The synthetic resin film layer [A] has a thickness of 10 μm or more, the nonwoven fabric layer [C] has a basis weight of 100 g / m ² or more, a needle punch or It is entangled by a fluid entanglement method, and the middle layer [B] is provided with a glass fiber structure.

  The waterproof concrete structure for roof construction according to the present invention is characterized in that the above-described waterproof cushioning sheet is laid on a roof concrete layer, and a waterproof layer is constructed thereon.

  As described above, when a glass fiber structure is used as the middle layer [B], it is experimentally shown that even when a waterproof layer (for example, a polyurethane waterproof layer) is formed by spraying, generation of wrinkles can be prevented. confirmed.

  Examples of the glass fiber structure include glass cloth (glass fiber fabric) and glass paper (paper-like material using glass fiber). However, when the ventilation cushioning sheet is exclusively rolled and stored, the glass paper tends to have curling habits, and when the ventilation cushioning sheet is constructed, there is a tendency for the end in the longitudinal direction to jump up, making it easy to handle. Somewhat inferior. On the other hand, the glass cloth does not have curling habits and is easy to handle during construction of the ventilation cushioning sheet. Therefore, it is preferable that it is a glass cloth also in a glass fiber structure.

The basis weight of the glass cloth is preferably 10 to 60 g / m ² , and the thickness is preferably 0.2 to 0.4 mm. If the basis weight or thickness is too small, there is a concern that the effect of preventing wrinkles will be poor, and if the basis weight or thickness is too large, the flexibility of the entire ventilation cushioning sheet will be poor and handling properties will be poor. Because there is concern.

  The thickness of the synthetic resin film layer [A] is 10 μm or more. This is because if the layer [A] is too thin, the entire ventilation cushion sheet becomes too soft and wrinkles are likely to occur.

The nonwoven fabric layer [C] is entangled by needle punching or fluid entanglement (for example, water punching). With such a non-woven fabric layer [C], the air permeability in the horizontal direction is good, and water vapor generated from the base can be released well in the horizontal direction. From the viewpoint of reliably exhibiting air permeability, the basis weight of the nonwoven fabric layer [C] is required to be 100 g / m ² or more. This is because a material with a small basis weight is too thin and air permeability is poor. In manufacturing a nonwoven fabric layer entangled by needle punching or fluid entanglement, embossing (hereinafter sometimes referred to as pre-embossing) may be applied weakly in order to prevent the fibers from falling apart immediately after spinning. However, due to subsequent needle punching or fluid entanglement, the thermal bonding points due to the pre-embossing are almost peeled off, and the horizontal air permeability is hardly inhibited.

  The waterproof cushioning sheet for waterproof construction of the present invention is preferably one in which the intermediate layer [B] and the nonwoven fabric layer [C] are joined via an adhesive layer, more preferably the synthetic resin film layer [A ] And the middle layer [B] are also bonded via the adhesive layer.

  By bonding the layer [B] and the layer [C] and the layer [A] and the layer [B] through the adhesive layer, these layers are strongly bonded and integrated, and the possibility of peeling is small.

  In addition, it is preferable that the anti-middle layer [B] side surface of the synthetic resin film layer [A] is coated with a urethane resin in the waterproof cushioned ventilation cushioning sheet of the present invention.

  In the case where the upper layer of the ventilation cushioning sheet is a film, the anchor effect as in the case of the nonwoven fabric cannot be expected, and there is a concern about peeling from the waterproof layer formed thereon. As the waterproof layer, urethane-based ones are widely used. However, in view of this point, the surface of the synthetic resin film layer [A] (waterproof layer construction side surface) is coated with a urethane resin. The familiarity with a urethane type waterproof layer is good, and the advantage that peeling does not occur easily is obtained.

In the present invention, the air flow rate obtained by the performance evaluation method in the air flow resistance test with the base in JASS8 is 10 mmAq. It is preferably 170 cm ³ / min or more when pressurized air. This is because if it is less than 170 cm ³ / min, the air permeability is poor, and there is a concern that the waterproof surface may swell or rise.

  According to the waterproof construction ventilation cushion sheet and the rooftop concrete structure according to the present invention, there is an effect that generation of wrinkles is prevented even when the waterproof layer is constructed by spray coating.

《About ventilation cushion sheet for waterproof construction》
FIG. 1 is a cross-sectional view showing a state in which a waterproof construction ventilation cushion sheet according to an embodiment of the present invention is applied to a concrete (base) surface.

  The ventilation cushioning sheet 10 of this embodiment is a layer [B] (intermediate layer [G] of the glass fiber structure between the synthetic resin film layer [A] 11 and the nonwoven fabric layer [C] 13 via the adhesive layers 14 and 15, respectively. B]) 12 is an integrated laminate, and a urethane resin coating layer 16 is provided on the surface of the synthetic resin film layer [A] 11 on which the waterproofing agent is coated (the anti-middle layer [B] side surface). Is.

  A through-hole 22 is formed in the ventilation cushioning sheet 10. The ventilation cushioning sheet 10 may be formed with the through holes 22 dispersed or not. However, by providing the through holes 22, the waterproof layer 17 (for example, urethane) is used as a base. It can be directly bonded to (concrete 21), which is preferable from the viewpoint of bonding strength.

  Below, the joining method of each layer and layer [A], [B], [C] is described.

1. Synthetic resin film layer [A]
Typical materials for the synthetic resin film layer [A] 11 include polyester resins and polyamide resins. In addition to these, polyolefin resins, copolymers thereof, ethylene vinyl alcohol resins, vinyl acetate. A polymer, polyvinyl alcohol resin, vinyl chloride resin, or a mixture of these resins (including those that are copolymers) can be used. However, in consideration of [1] interaction with urethane solvents and polyester resins used as waterproof layer materials and solvents used in those resins (dissolution resistance, adhesiveness, etc.), [2] consideration of handling in construction In view of the appropriate rigidity and strength, and [3] the hydrophobicity of the case when it rains during construction, hydrophobic and solvent-resistant synthetic resins are preferred. Polyethylene terephthalate It is preferable to apply polybutylene terephthalate, polytrimethylene terephthalate, modified polyester, a mixture thereof, or any copolymer film thereof.

  The thickness of the synthetic resin film layer [A] is 10 μm or more, more preferably 15 μm or more and 80 μm or less. If the thickness is too thin, the entire ventilation cushioning sheet becomes very soft and wrinkles are likely to occur. Conversely, if the thickness is too thick, the entire ventilation cushioning sheet becomes hard and the followability to the ground becomes worse. These may be a single layer or multiple layers.

  The synthetic resin film layer [A] 11 plays a role of reinforcing the waterproof layer. Moreover, even if moisture remains on the surface of the ventilation cushioning sheet 10 due to rain or the like after laying the ventilation cushioning sheet 10 and before applying the waterproofing agent, the layer [A] 11 is a resin film. It can be easily removed, and the waterproofing agent can be smoothly applied thereon.

2. Glass fiber structure layer [B] (middle layer [B])
Examples of the glass fiber structure layer [B] 12 include glass cloth and glass paper as described above.

A commercially available product can be used as the glass cloth. For example, the glass cloth is woven at a woven density of 1 to 3 / cm and appropriately provided with a resin. The basis weight is 50 to 13 g / m ² (including resin) [JIS L 1096], Thickness 0.23-0.33 mm [thickness gauge (dial gauge type, pressure area: 1 cm ² , pressure: 50 gf / cm ² )], tensile strength (warp, weft) 220 N / 5 cm or more [JIS L 1096], Examples include elongation (warp, weft) of 2 to 4% [JIS L 1096].

3. Nonwoven fabric layer [C]
As a raw material of the nonwoven fabric layer [C] 13, a glass-based short fiber, a polyester-based fiber, a polyamide-based fiber, a polypropylene-based fiber, a polyester spunbond by tow opening or a polyvinyl alcohol spunbond is preferable. In particular, when the base is concrete, it is preferable to have excellent alkali resistance, and in view of this point, an acrylic fiber nonwoven fabric is preferable.

The nonwoven fabric layer [C] 13 is entangled by needle punching or fluid entanglement method, and has a basis weight of 100 g / m ² or more, whereby good air permeability can be realized. From the viewpoint of improving air permeability, the weight per unit area is more preferably 160 g / m ² or more. On the other hand, the upper limit of the basis weight of the nonwoven fabric layer [C] 13 is preferably 300 g / m ² . This is because if the basis weight is too high, the mass of the ventilation cushioning sheet 10 becomes heavy and workability decreases. More preferably, it is 250 g / m ² or less.

  The fibers of the nonwoven fabric layer [C] 13 may be either long fibers or short fibers, but are preferably long fibers from the viewpoint of strength.

Nonwoven fabric layer [C] 13 is an evaluation method in JASS8 [JASS (1986) Reference test 1. The air permeability between the base surface determined by the performance evaluation test method “8. Ventilation resistance test with the base” (pages 340 to 342)] of 10 mmAq. It is preferable that the outflow amount is 170 cm ³ / min or more when pressurized air. In addition, by using such a nonwoven fabric layer [C] 13, the ventilation buffer sheet 10 can exhibit a performance of an air permeability of 170 cm ³ / min or more.

  The non-woven fabric layer [C] 13 functions as a ventilation layer as described above, but since it is a non-woven fabric, it can realize the followability to the base with the flexibility that is unique to the non-woven fabric.

4). Method of joining layers [A], [B], and [C] by using an adhesive layer As the adhesive layers 14 and 15, a polyolefin film such as a polyethylene film or a polypropylene film, or a film of a copolymer thereof Other examples include polyester films, polyamide films, vinyl chloride films, and vinyl acetate polymer (EVA) films.

  As a method of joining layer [B] -layer [C] and layer [A] -layer [B] using these resin films, a lamination method such as an extrusion lamination method (extrusion lamination method) or a dry lamination method is used. Or the method of carrying out lamination | stacking integration by the coating method is mentioned.

  For example, regarding the extrusion lamination method, a case where a polyethylene film is used as the adhesive layers 14 and 15 will be described in detail as an example. Between the synthetic resin film layer [A] 11 and the glass fiber structure layer [B] 12, and the glass fiber Between the structure layer [B] 12 and the nonwoven fabric layer [C] 13, lamination is performed while extruding a raw material of a molten or semi-molten polyethylene film (sand lamination method by extrusion lamination method).

  As thickness of the adhesive layers 14 and 15 in the above, 10-80 micrometers is preferable. It is because there exists a possibility that the anchor effect with respect to glass fiber structure layer [B] 12 and nonwoven fabric layer [C] 13 may become scarce when it is too thin, and joint strength may become low. On the other hand, if it is too thick, the air-permeable cushion sheet becomes too hard and the followability to the ground becomes worse.

  In addition to the above, the adhesive layers 14 and 15 may also include an acrylic pressure-sensitive adhesive. In this case, it is preferable to dissolve in a solvent, apply to the surface of the layer [B] or layers [C], [A] using a transfer roll, and bond the layers by the adhesiveness of the acrylic adhesive.

5). Coating layer As a formation method of the coating layer 16, printing on the surface of the synthetic resin film layer [A] 11 is exemplified. A urethane-based ink may be used for this printing material. This ink includes a polyurethane resin obtained by polyaddition reaction of diisocyanate and diol. TDI (tolylene diisocyanate) or IPDI (isophorone diisocyanate) is used as diisocyanate, and long-chain polyether or Polyester is used.

  In printing, a method of applying a polyurethane resin dissolved in an organic solvent with a gravure roll or a method of applying a solvent-type ink containing a polyurethane resin as a vehicle with a gravure roll can be used. As the organic solvent, a mixed solvent such as toluene, methyl ethyl ketone, and isopropyl alcohol can be generally used. The concentration of the polyurethane resin is preferably 10 to 30%. If it is less than 10%, there is a concern that the coating amount is reduced when applying with a gravure roll, and there is a concern that the adhesion to the polyurethane waterproof layer may be deteriorated, and if it exceeds 30%, a ventilation buffer sheet is wound in a roll shape. This is because there is a possibility that blocking sometimes occurs, and the viscosity increases because the concentration in the organic solvent is high, so that the viscosity is not suitable for application with a gravure roll.

《About construction method》
Next, a construction method using the ventilation cushioning sheet 10 will be described (FIG. 1).

  In the construction, first, the primer 19 is applied to the lower ground of the concrete 21 or the like (the primer 19 may be omitted depending on the base material), and then the adhesive 18 is applied. Next, the ventilation cushioning sheet 10 is arranged on the adhesive 18 application surface so that the synthetic resin film layer [A] 11 side is the front side, that is, the nonwoven fabric layer [C] 13 side is adhered to the adhesive 18. Thereafter, a waterproofing agent such as polyurethane is applied from above the ventilation cushioning sheet 10 (that is, from above the synthetic resin film layer [A] 11). This application method may be either spraying or hand coating. When the waterproofing agent is cured (waterproof layer 17), the construction is completed.

  When the ventilation cushioning sheet 10 is used, no wrinkles appear on the finished waterproof layer 17 because the glass fiber structure is used for the middle layer [B].

  Hereinafter, the present invention will be described in more detail with reference to experimental examples.However, the present invention is not limited by the following examples as a matter of course, and is implemented with appropriate modifications within a range that can meet the purpose described above and below. Of course, any of these is also included in the technical scope of the present invention.

"Evaluation methods"
First, various evaluation methods in the following experimental examples will be described. Regarding the sample direction, the machine direction (manufacturing flow direction) is referred to as MD direction, and the direction orthogonal to the machine direction is referred to as CD direction.

<Weight per unit (mass per unit area)>
Conforms to JIS-L1906. Specifically, 20cm in MD direction, a test piece of 25cm square in the CD direction, and five places taken in the CD direction, after calculating the average value thereof was measured respective weight, in terms of the weight per 1 m ² To a basis weight (g / m ² ).

<Thickness>
Conforms to JIS-L1906. Specifically, the pressure condition is measured as 1.96 kPa at 10 locations per 1 m of the test piece full width in the CD direction, and the average value of these is calculated to obtain the thickness.

  However, the thicknesses of the adhesive layers 14 and 15 and the middle layer [B] (PE film) in Experiment No. 9 are measured by the following method.

  That is, first, a test piece is sampled from 20 arbitrary portions of the ventilation cushioning sheet 10. Next, the test piece is cut so that the cut surface is vertical, vapor-deposited so that the cut surface can be observed, and photographed with a scanning electron microscope at an arbitrary magnification. In this photograph taken, it exists between the synthetic resin film layer [A] 11 and the glass fiber structure layer [B] 12 or between the glass fiber structure layer [B] 12 and the nonwoven fabric layer [C] 13. The thickness of the adhesive layers 14 and 15 (or the middle layer [B] of Experiment No. 9) is measured with calipers, and the thickness is obtained by converting the photographic magnification at the time of photographing. The obtained 20 thicknesses (respective thicknesses in the 20 test pieces) are averaged to obtain the thickness of the adhesive layers 14 and 15 (or the middle layer [B] of Experiment No. 9). In measuring with calipers, the upper and lower glass fiber structure layers [B] 12 and the non-woven fabric layer [C] 13 of the adhesive layers 14 and 15 (or the middle layer [B] of Experiment No. 9) are used. Measure as an edge. Further, when there is a concern that the shape of the cross section changes during the cutting, in order to suppress the shape change, the aeration buffer sheet 10 is frozen using a quick freezing device and then cut. Incidentally, when the resin films are used as the adhesive layers 14 and 15, the adhesive layers 14 and 15 are formed so as to bite into the glass fiber structure layer [B] 12 and the nonwoven fabric layer [C] 13 respectively in the manufacturing process. Therefore, since the adhesive layers 14 and 15 have irregularities on the surface, the thickness measuring method as described above was adopted.

<Strength>
Samples are punched into 5 cm × 20 cm strips in the MD and TD directions. About this sample, according to JIS-L1906 5.3.1, the tension | tensile_strength applied at the time of a fracture | rupture is measured by MD and TD direction N = 5 using a Tensilon tensile tester, respectively.

<Deaeration breathability>
JASS8 (1986) Reference test The membrane waterproof layer is measured according to the performance evaluation test method “8. Ventilation resistance test between bases” (pages 340 to 342).

<Water impermeability>
According to DIN-16935 in the "General Standard for Performance Evaluation of Waterproofing Systems for Roofs" (translation, Tokyo Institute of Technology, Institute for Materials Research, Koike Laboratory, Kobunsha) Measure according to the test method.

<Confirmation of construction test 皺>
Apply an adhesive (chloroprene-based adhesive) to the concrete base surface to 0.4 kg / m ^2, and immediately apply about 6 m ^{2 of the} air cushioning sheet with the synthetic resin film layer [A] side facing up. Apply urethane-based waterproofing material (Chemical Formula 1 below) to 1 kg / m ^{2 on the top,} and then apply the same urethane-based waterproofing material again to 1 kg / m ² (urethane waterproofing material is ² kg / m in total) m ² ).

  After the urethane waterproofing agent is cured, the construction surface is visually observed to determine the presence or absence of wrinkles.

<< Production Method of Ventilation Buffer Sheet of Experimental Example >>
Next, the manufacturing method of the ventilation buffer sheet of each experimental example is described. In this case, in order to facilitate understanding, the reference numerals in FIG.

<Experiment Nos. 1-4, 7>
A film made of polyethylene terephthalate (glass transition point 70 ° C.) having a width of 2.1 m and a thickness of 25 μm is supplied to an extrusion lamination apparatus, and a film of copolymerized polyethylene terephthalate having a thickness of 15 μm is extruded on the film to a width of about 2 m. Film layer [A] was obtained (film layer [A] 11). The surface of this film layer [A] was printed with urethane ink (coating layer 16).

  On the other hand, a polyethylene terephthalate having an intrinsic viscosity of 0.68 was spun at a spinning temperature of 285 ° C., a single hole discharge rate of 2.5 g / min from a nozzle with a pore diameter of 0.35 mm, and a take-up speed of 4800 m / min. Obtained. Subsequently, the spunbonded nonwoven fabric was embossed (dots 5 mm apart, embossed area ratio 11%, 175 ° C., linear pressure 50 kN / m) to obtain a weak thermocompression type nonwoven fabric. Further, this nonwoven fabric was needled using an organ company FPD1-40S at a needle depth of 13 mm and a density of 80 N / cm to obtain a spunbond nonwoven fabric layer [C] 13 having a fineness of 4.4 dtex. The basis weight and thickness of each nonwoven fabric layer [C] 13 are shown in Table 1.

  A glass cloth having a basis weight and a thickness as shown in Table 1 was prepared as the middle layer [B] 12.

  Next, polyethylene (adhesive layer 14 between AB) is arranged between the glass cloth of the middle layer [B] 12 and the film layer [A] 11, and the polyethylene is adhered using a T-die film extruder. The middle layer [B] 12 and the film layer [A] 11 were integrated by laminating while keeping the thickness to 20 μm.

  Furthermore, this composite (film layer [A] 11 + middle layer [B] 12) and the needling nonwoven fabric layer [C] 13 are layered in the same manner as described above, with a layer thickness of 20 μm (between B and C) after completion of polyethylene. The air-permeable cushioning sheet 10 was obtained by integrating by laminating while forming the adhesive layer 15).

<Experiment No. 5>
A film made of polyethylene terephthalate (glass transition point 70 ° C.) having a width of 2.1 m and a thickness of 40 μm was used as the film layer [A] 11, and the surface of this film layer [A] was printed with urethane-based ink (coating layer) 16).

The following were used as the nonwoven fabric layer [C] 13. That is, a staple fiber obtained by blending an acrylic fiber having a fineness of 4.4 dtex and a cut length of 56 mm and a polyethylene terephthalate fiber having a fineness of 4.4 dtex and a cut length of 56 mm at a blending ratio (50/50) is obtained. A web was formed by the wrapper. Subsequently, short fiber nonwoven fabric layer [C] 13 having a basis weight of 212 g / m ² and a thickness of 1.8 mm was obtained by performing needling with a needle depth of 13 mm and a density of 80 N / cm using Organ Corporation FPD1-40S.

  A ventilation cushioning sheet 10 was obtained in the same manner as in Experiment No. 2 except that the film layer [A] 11 and the nonwoven fabric layer [C] 13 were used.

<Experiment No. 6>
A breathable cushion sheet 10 was obtained in the same manner as in Experiment No. 1 except that the surface of the film layer [A] 11 was not subjected to printing with urethane (no coating layer 16 was provided).

<Experiment No. 8>
Among the ventilation buffer sheets of Experiment No. 1, a film made of polyethylene terephthalate (glass transition point 70 ° C.) having a thickness of 8 μm was used as the film A layer 11, and the thickness of the nonwoven fabric layer [C] 13 was set to 1.0 mm. In the same manner as in Experiment No. 1, a ventilation cushioning sheet 10 was obtained.

<Experiment No. 9>
As the film layer [A] 11, a film having a thickness of 75 μm obtained by laminating copolymer polyethylene terephthalate on a film of polyethylene terephthalate having a thickness of 25 μm by the same manufacturing method as described above was used as the nonwoven fabric layer [C] 13. The same as No. 2 was used.

  Using a T-die film extruder, the film layer [A] 11 and the nonwoven fabric layer [C] 13 are laminated so that a semi-molten polyethylene (melt index: 7) is sandwiched between them, and a polyethylene having a thickness of 20 μm. A ventilation buffer sheet in which the film layer (corresponding to the middle layer [B]) was sandwiched and integrated between the film layer [A] 11 and the nonwoven fabric layer [C] 13 was obtained.

<Experiment No. 10>
Similar to Experiment No. 1 except that the following laminated glass paper was used instead of the glass cloth of the middle layer [B] 12 in Experiment No. 1 and that the adhesive layer 15 between B and C was set to 30 μm. Thus, a ventilation cushioning sheet 10 was obtained. The laminated glass paper is a laminate of polyethylene paper (20 μm) sandwiched between glass paper (25 g / m ² basis weight) and a polyethylene terephthalate spunbond nonwoven fabric (15 g / m ² basis weight) (thickness 0.3 mm, The basis weight is 58 g / m ² ).

《Waterproofing method》
After applying the adhesive 18 (trade name DU488B, manufactured by Nogawa Chemical Co., Ltd.) to 0.4 kg / m ^{2 on the} base 21 made of concrete or the like, the air-permeable cushion sheet 10 of each of the above experimental examples is applied to the nonwoven fabric layer [C ] Was pasted so that it became an adhesive surface. Next, a general-purpose urethane waterproofing material for flat field is applied by spraying with a spray gun so as to be 1 kg / m ^2, and after curing, the urethane waterproofing agent for flat field is similarly 2 kg / m ^2. It was sprayed with a spray gun and overcoated (a total of 3 kg / m ² ). After the overcoated waterproofing agent was cured, a waterproofing layer 17 was formed by applying a topcoat urethane waterproofing material containing an ultraviolet absorber and the like to 0.3 kg / m ² .

  Regarding the waterproof layer constructed as described above, in the case of using the ventilation cushioning sheets of Experiment No. 1 to 6, 10, no wrinkles or the like occurred on the surface of the waterproof layer, and after further investigation for one month, It was found that the waterproof layer formed a good waterproof layer without swelling or lifting. The survey was conducted for one year, and it was in good condition without any abnormalities.

  However, in Experiment No. 6, since the adhesiveness with the waterproof layer (polyurethane waterproof layer) was inferior, it was found that the polyurethane waterproof layer needs to be carefully constructed.

  In Experiment No. 10, the longitudinal end of the ventilation cushioning sheet was rolled up due to the winding of the glass paper, and the handleability during construction was not good. Further, the glass paper has poor adhesiveness, and it takes time to produce a ventilation cushioning sheet as a laminate.

  On the other hand, in Experiment Nos. 7 to 9, wrinkles were generated on the surface of the waterproof layer. Among them, the experiment No. 9 is a stretched ridge, which is considered to be caused by spraying a waterproof layer. The experiment No. 7 is an uneven ridge, which is because the thickness of the nonwoven fabric layer [C] is small, and the unevenness of the surface of the base 21 affects the front side surface of the ventilation cushioning sheet, and the surface of the waterproof layer. It is thought that it appeared as a spear. In Experiment No. 7, there was little air flow and swelling occurred one month after the construction. The experiment No. 8 is a wavy corrugation, and the cause of this is that the film layer [A] has a thin thickness, so the air cushioning sheet has poor shape retention. It is thought that wrinkles occurred due to distortion.

It is sectional drawing showing a mode that the ventilation | gas_flowing cushioning sheet for waterproof construction which concerns on one Embodiment of this invention was constructed | assembled on the concrete (base | substrate) surface.

Explanation of symbols

10 Ventilation cushion sheet 10
11 Synthetic resin film layer [A]
12 Glass fiber structure layer [B] (middle layer [B])
13 Nonwoven fabric layer [C]
14, 15 Adhesive layer 16 Coating layer 17 Waterproof layer 18 Adhesive 19 Primer 21 Concrete 22 Through hole

Claims (6)

A ventilation cushioning sheet for waterproof construction in which a middle layer [B] is disposed and integrated between a synthetic resin film layer [A] and a nonwoven fabric layer [C],
The synthetic resin film layer [A] has a thickness of 10 μm or more,
The nonwoven fabric layer [C] is tangled by a needle punch or fluid entanglement method with a basis weight of 100 g / m ² or more,
The middle layer [B] is provided with a glass fiber structure.   The breathable cushion sheet for waterproof construction according to claim 1, wherein the glass fiber structure is a glass cloth.   The ventilation cushion sheet for waterproofing construction according to claim 1 or 2, wherein the middle layer [B] and the nonwoven fabric layer [C] are bonded via an adhesive layer.   The ventilation cushion sheet for waterproofing construction according to claim 3, wherein the synthetic resin film layer [A] and the middle layer [B] are bonded via an adhesive layer.   The ventilation buffer sheet for waterproof construction according to any one of claims 1 to 4, wherein a surface on the side opposite to the middle layer [B] in the synthetic resin film layer [A] is coated with a urethane resin.   A waterproof construction roof concrete structure characterized in that a waterproof cushioning ventilation cushion sheet according to any one of claims 1 to 5 is laid on a roof concrete layer, and a waterproof layer is constructed thereon. .

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