JPWO2016031236A1 - Thermal insulation under the roof - Google Patents

Abstract

[PROBLEMS] To provide a heat-insulating roof covering material that has sufficient heat shielding properties, satisfies the slip resistance and water resistance required as the performance of the roof covering material, and has durability that can withstand long-term construction. The purpose is to provide. An uppermost outermost layer in the vertical direction is a metal film layer containing a metal pigment, a binder, and particles, and is a heat shield roof covering material having at least a reinforcing layer and a waterproof layer under the metal film layer. The thermal barrier roof is characterized in that the average reflectance of infrared rays in the wavelength region of 5 to 10 μm of the metal film layer is 60% or more and the average reflectance of infrared rays in the wavelength region of 5 to 10 μm is 30% or less. Lower wood.

Description

  The present invention relates to a heat-insulating roof underlaying material, and more particularly, to a heat-insulating roof underlaying material excellent in heat shielding properties, slip resistance, waterproofness, and durability.

  Conventionally, roofing materials are used for the roofs of houses. The roof underfloor material prevents rainwater from entering indoors by constructing it under a roof material such as a tile, a slate, or a sheet metal. In addition, the surface has anti-slip properties in consideration of safety when the worker walks on the roof covering material.

  Asphalt felt is a specific example of the roof covering material conventionally used. Asphalt felt is a roofing material made of nonwoven fabric or paper impregnated with asphalt. In addition, as a roof underlaying material that is lighter than asphalt and excellent in workability, a roof underlaying material obtained by laminating lightweight synthetic resins and fabrics has been proposed.

  In recent years, in order to enhance the cooling effect in summer, the development of a roof covering material having a heat shielding property has been demanded. For example, a roof covering material provided with a metal film layer that reflects infrared rays from the sun has been proposed. Yes. For example, Patent Document 1 discloses a heat shield roof covering material in which an aluminum foil or an aluminum vapor deposition film as a metal film layer is laminated on a surface layer of a resin sheet provided with protrusions in a dispersed manner. Patent Document 2 discloses a heat insulating roof base material having a metal film layer on one surface of a fabric and a moisture permeable waterproof film laminated on the other surface of the fabric. Patent Document 3 discloses a waterproof sheet for a thermal insulation roof provided with a thermal insulation layer obtained by adding a titanium oxide powder having thermal insulation properties to a foamable resin.

  However, in the roof underlaying material of Patent Document 1, the heat shielding effect is improved by the protrusions on the surface of the sheet, but the protrusions provided in a dispersed manner are inferior in slip resistance and slip when walking on the seat during work. There was a fear. Moreover, since the thing like the building sheet of patent document 2 is excellent in light-shielding property because the metal film layer is formed by vapor deposition, the metal is provided directly on the sheet surface, The exposed state of the metal film is inferior in a long-term construction environment. Moreover, in patent document 3, since the resin layer containing a titanium oxide powder is arrange | positioned on a nonwoven fabric, although durability of the thermal-insulation layer became excellent, since the titanium oxide powder is employ | adopted, it is metal Compared with, there was a possibility that the heat shielding property was inferior.

JP 2008-214934 A JP 2008-069539 A JP 2010-043496 A

  The present invention solves the above-mentioned problems, has sufficient heat shielding properties, satisfies the slip resistance and waterproof properties required as the performance of roofing roofing materials, and has durability that can withstand long-term construction. Another object is to provide a heat-insulating roof underlaying material that also serves as a base.

  That is, according to the present invention, the uppermost outermost layer in the vertical direction is a metal film layer containing a metal pigment, a binder, and particles, and the heat shielding roof covering material having at least a reinforcing layer and a waterproof layer under the metal film layer. The infrared ray average reflectance in the wavelength region of 5 to 10 μm of the metal film layer is 60% or more, and the infrared average absorptance in the wavelength region of 5 to 10 μm is 30% or less. It is a thermal roof underglazing material.

Here, the shape of the metal pigment is preferably scaly.
The surface of the metal pigment is preferably subjected to at least one treatment selected from an organic coating treatment, an inorganic coating treatment, an oxide coating treatment, and a hydroxide coating treatment.
Moreover, it is preferable that the said particle body is comprised by the at least 1 sort (s) of particle body selected from inorganic type powder or a thermally expansible microcapsule.
Moreover, it is preferable that the infrared rays average transmittance | permeability in the wavelength range of 5-10 micrometers of the said binder is 80% or more.

  According to the present invention, there is an effect that it has sufficient heat shielding properties, has anti-slip properties and waterproof properties that are required as the performance of roof covering materials, and also has durability that can withstand long-term construction.

It is a cross-sectional schematic diagram which shows the example of the heat insulation roof underlay material which is an example of embodiment of this invention. It is a cross-sectional schematic diagram which shows other embodiment. It is a cross-sectional schematic diagram which shows other embodiment.

  An example of an embodiment of the heat-insulating roof underlaying material of the present invention will be described with reference to FIG. The heat-insulating roof underlaying material 1 of the present invention is a laminate in which a waterproof layer 6 and a reinforcing layer 7 are sequentially provided under a metal film layer 5 composed of a metal pigment 2, a binder 3, and a particle body 4.

In the present invention, the outermost layer on the upper side in the vertical direction is the metal film layer 5 in which the metal pigment 2 and the particle body 4 are mixed in the binder 3, and the metal film layer 5 has a wavelength of 5 to 10 μm. In the region, the average infrared reflectance is 60% or more and the average infrared absorption is 30% or less. If the average infrared reflectance is less than 60%, infrared rays cannot be sufficiently reflected, and sufficient heat shielding properties cannot be obtained. When the average infrared absorption rate exceeds 30%, heat is accumulated by absorption in the metal film layer, thereby hindering heat insulation. The infrared average absorptance is calculated by the following calculation formula from the result of measuring the infrared average reflectance and the infrared average transmittance with a Fourier transform infrared spectrophotometer.
Infrared average absorptance [%] = 100 [%]-(Infrared average reflectance [%] + Infrared average transmittance [%])

In addition, the metal film layer 5 includes the metal pigment 2 mixed in the binder 3, so that the binder 3 becomes a protective film, prevents the metal pigment 2 from corroding, and improves the durability of the heat shield roof covering material. Can be improved.
The metal film layer 5 preferably has an infrared reflection retention in a wavelength region of 5 to 10 μm of 40% or more. More preferably, it is 60% or more. Further, it is particularly preferably 80% or more. When the infrared reflection retention is 40% or more, the heat shielding property can be maintained even when the construction is performed for a long time. From the results of measuring the infrared average reflectance of the metal film layer before carrying out the durability evaluation and the infrared average reflectance of the metal film layer after carrying out the durability evaluation, the infrared reflection retention rate is as follows: Calculate with the following formula.
Infrared reflection retention [%] = (Infrared average reflectance [%] of the metal film layer after the durability evaluation is performed / Infrared average reflectance [%] of the metal film layer before the durability evaluation is performed) × 100

  As for durability evaluation, as described later, the thermal insulation roof underlaying material 1 is subjected to exposure promotion treatment (JIS A 611.77.7), acid treatment (JIS K 714.4), and alkali treatment (JIS A 6013.7. Perform 5.2) to calculate the infrared reflection retention in each process.

  The metal pigment 2 is preferably at least one selected from the group consisting of aluminum, nickel, stainless steel, gold, silver, lead, zinc, magnesium, chromium and the like, which are metals having infrared reflectivity. Of these, aluminum is preferable from the viewpoints of economy and workability.

Examples of the shape of the metal pigment 2 include a powder shape and a scale shape, and a scale shape that easily reflects infrared rays is preferable. That is, the average aspect ratio (average particle diameter (D ₅₀ : volume-based median diameter) ÷ average particle thickness (N = 100 average)) is preferably 5 or more, more preferably 10 to 1000, and particularly preferably 20 to 500. It is.

  There are two types of scale-like metal pigments 2, a leafing type that tends to be in a parallel arrangement when a coating film is formed, and a non-leafing type that tends to be in a dispersed arrangement, but both are used in the embodiment of the present invention. it can. In particular, when the amount of the metal pigment 2 is relatively small and the average aspect ratio is relatively low, the leafing type is more preferably used to increase the infrared reflectance.

  The average particle diameter of the metal pigment 2 is preferably 2 μm to 80 μm, more preferably 4 to 40 μm. If it is 2 μm or more, there is little influence of diffuse reflection and the heat shielding property is improved. Moreover, if it is 80 micrometers or less, the dispersibility of a pigment is good and abrasion resistance improves.

  The metal pigment 2 is preferably surface-treated in order to obtain superior durability. Specifically, an organic coating treatment with an acrylic or melamine resin, an inorganic coating treatment with silica or the like, an oxide coating treatment with phosphoric acid or molybdic acid, or a hydroxide coating treatment. Of these, acrylic organic coating treatment is preferable in terms of excellent adhesion to the binder, friction resistance, and chemical resistance.

  The added amount of the metal pigment 2 is preferably 5 to 50 parts by weight, more preferably 5 to 20 parts by weight, and further preferably 5 to 10 parts by weight with respect to 100 parts by weight of the binder 3. . If it is 5 parts by weight or more, it is easy to form a metal film and a sufficient heat shielding property can be obtained. If it is 50 parts by weight or less, the wear resistance is improved.

  The binder 3 is not particularly limited as long as the binder 3 is a resin material that can be formed into a film and can disperse the metal pigment 2 and the particles 4. Specifically, the polyolefin 3, polyurethane-based, acrylic-based, and epoxy-based materials can be used. And at least one resin selected from the group consisting of vinyl acetate, polyester, cellulose, phenol, and melamine. Among them, it is preferable to use a low molecular weight polyolefin as a main agent in terms of good dispersibility of the metal pigment and increased uniformity.

  The binder 3 preferably has an average infrared transmittance of 80% or more in a wavelength region of 5 to 10 μm. If it is 80% or more, the infrared rays incident on the metal film layer can easily reach the metal pigment, and the reflected infrared rays can be easily emitted to the outside.

  The molecular weight of the binder 3 is preferably 500 to 150,000, more preferably 8000 to 100,000, and still more preferably 10,000 to 50,000. If it is 500 or more, a film having excellent strength can be formed, and film formation is facilitated. If it is 150,000 or less, a metal pigment can be disperse | distributed uniformly and heat insulation property will improve.

  Examples of the particle body 4 include polymer powders, inorganic powders, and thermally expandable microcapsules. Among these, at least one kind of particle body is preferable, which is selected from inorganic powders and heat-expandable microcapsules from the viewpoint of further improving the anti-slip property of the surface of the roof underlaying material. By adding the particle body 4, fine irregularities can be formed on the entire surface of the heat-insulating roof underfloor material, and the friction coefficient is increased, thereby providing anti-slip properties.

  The inorganic powder preferably has a wedge shape such as a wedge shape, a polygonal pyramid, a cone or other wedge shape, or a puncture type three-dimensional irregular shape such as a needle shape. Specific examples include silica, calcium carbonate, titanium oxide, zinc oxide, and magnesium carbonate. Of these, zinc oxide is preferred because of its good dispersibility in the binder, excellent chemical resistance, and heat dissipation.

  The heat-expandable microcapsule is a microcapsule containing a gas such as a hydrocarbon, and has excellent heat insulation properties, and therefore can enhance heat shielding properties.

  The hydrocarbon encapsulated in the thermally expandable microcapsule is preferably a hydrocarbon having a low boiling point such as n-butane, i-butane, pentane, or neopentane.

  Moreover, a thermoplastic resin is mentioned as a raw material of the said thermally expansible microcapsule, Specifically, an acrylic type, an olefin type, a urethane type, a vinyl acetate type, a silicone type etc. are mentioned. Of these, acrylic is preferred because it is inexpensive and has excellent processability.

  The average particle diameter of the thermally expandable microcapsule before foaming is preferably 5 to 50 μm. The expansion ratio is preferably 2 to 20 times. In addition, the foaming magnification here shows the magnification of the average particle diameter of a thermally expansible microcapsule. If it is this range, sufficient slip resistance and abrasion resistance can be obtained. Moreover, it is preferable that the particle diameter of the said thermally expansible microcapsule after thermal foaming is 10-1000 micrometers. If it is 10 micrometers or more, the fine unevenness | corrugation for obtaining anti-slip property on the surface can be formed. Moreover, if it is 1000 micrometers or less, drop-off | omission of a particle body will be suppressed and abrasion resistance will improve.

  The added amount of the particle body 4 is preferably 2 to 40 parts by weight of the binder 3 with respect to 100 parts by weight. Especially, when the said particle body is a thermally expansible microcapsule, it is 5-30 weight part, but when it is the said inorganic type powder, it is more preferable that it is 3-15 weight part. If it is 2 parts by weight or more, it is possible to form irregularities by the particulates on the entire surface. If it is 40 parts by weight or less, dropping of the particles can be suppressed.

  The metal film layer is formed by dispersing the metal pigment 2 and the particle body 4 in the binder 3. In addition, other additives such as an antioxidant, a light stabilizer, an ultraviolet absorber, an antifungal agent, and a filler can be added as necessary as long as the object of the present invention is not impaired.

  When the metal film layer 5 is formed, a solvent can be added to the metal pigment 2, the binder 3, and the particle body 4. Examples of the solvent to be used include aromatic hydrocarbon-based hexane, benzene, toluene, xylene, styrene, naphthalene and the like in which the dispersibility of the metal pigment is good. Of these, toluene is preferable from the viewpoints of economy and ease of handling.

  For forming the metal film layer 5, a known coating method such as a roll coating method, a gravure coating method, or a reverse coating method is used. Moreover, it is preferable that the thickness of the metal film layer after drying is 30-300 micrometers. If it is 30 μm or more, sufficient heat shielding properties and slip resistance can be obtained. Moreover, if it is 300 micrometers or less, since the resin crack of a metal film layer can be suppressed and it is further lightweight, the workability | operativity at the time of construction will also improve.

  The material of the waterproof layer 6 is not particularly limited as long as it has waterproofness, but a resin film is preferably used. Specific examples include films made of one or more materials selected from the group consisting of polyolefins, polyesters, polyamides, and polyurethanes. Of these, polyolefin or polyester films are preferred in terms of processability, strength, dimensional stability, and hydrophobicity.

  The waterproof layer 6 preferably has a tensile strength of 10 MPa or more in the length direction and 10 MPa or more in the width direction. As long as this strength is satisfied, tearing during work can be reduced.

  The waterproof layer 6 preferably has a thickness in the range of 20 to 200 μm. If it is 20 μm or more, sufficient strength can be obtained, and if it is 200 μm or less, it is lightweight and excellent in flexibility, so that workability is improved.

  The manufacturing method of the said waterproof layer 6 is not specifically limited, It can manufacture with well-known manufacturing methods, such as an inflation method, a T-die method, a casting method.

  In addition, the waterproof layer 6 is preferably subjected to surface modification such as ultraviolet treatment, plasma treatment, corona treatment, etc., in order to improve adhesion with adjacent layers.

  The reinforcing layer 7 is not particularly limited as long as it can reinforce and support the waterproof layer 6, and specific examples thereof include a nonwoven fabric, a woven fabric, a knitted fabric, and a film. Among these, a nonwoven fabric is preferable because it is inexpensive and has excellent productivity.

  The reinforcing layer 7 preferably has a tensile strength of 25 N / cm or more in the length direction, 20 N / cm or more in the width direction, and a tear strength of 10 N or more in the length direction and 8 N or more in the width direction. If this strength is satisfied, tearing and tearing during work can be reduced.

The basis weight of the reinforcing layer 7 is preferably 60 to 300 g / m ² . If it is 60 g / m ² or more, sufficient strength can be obtained. Moreover, since it is lightweight if it is 300 g / m < ² > or less, the workability | operativity at the time of construction improves.

  The material of the reinforcing layer 7 is not particularly limited, and specifically, from the group consisting of polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polymethylene terephthalate, and polyamides such as nylon and aramid. It is mentioned that it is a polymer material consisting of at least one selected material. Of these, polyesters and polyolefins are preferred in terms of excellent processability, strength, dimensional stability, and hydrophobicity.

  The heat-insulating roof underlaying material 1 of the present invention may further be appropriately laminated with a water-stopping layer, an adhesive layer, an anti-slip layer, a reinforcing layer, a waterproof layer and the like as necessary. Moreover, you may laminate | stack two or more layers aiming at the same effect, such as laminating | stacking two or more waterproof layers.

  For example, as another embodiment of the present invention, a waterproof layer 6, a water blocking layer 8, a reinforcing layer 7, and a waterproof layer 6 are provided in this order under the metal film layer 5 composed of the metal pigment 2, the binder 3, and the particle body 4. The laminated body is shown in FIG. By laminating as described above, waterstop, strength and waterproofness are improved.

  As the water-stopping layer 8, a water-absorbing resin is preferably used, and is a layer provided for the purpose of preventing moisture from entering from a nail hole or the like, not particularly limited, polyvinyl alcohol-based polyvinyl alcohol cross-linked polymer, etc. Other addition polymers such as acrylic polyacrylic acid crosslinked polymer, sodium acrylate-vinyl alcohol copolymer, polyether based polyethylene glycol diacrylate crosslinked polymer, etc., maleic anhydride polymer, vinyl Pyrrolidone polymers and other condensation resins can be used.

  As still another embodiment, a laminate in which a waterproof layer 6, a reinforcing layer 7, and an adhesive layer 9 are provided in this order under a metal film layer 5 composed of a metal pigment 2, a binder 3, and a particle body 4 is shown in FIG. Shown in By laminating as in this embodiment, adhesiveness is exhibited, workability is improved, and further, the roof underlaying material can reduce sliding from a field board after the construction.

  Examples of the adhesive layer 9 include polyolefin-based, polyacryl-based, polyurethane-based, polyester-based and silicone-based solvent-based resins, natural rubber-based materials, synthetic rubber-based materials, and the like. Among these, a synthetic rubber that is less affected by temperature and hardly affected by the polarity of the adherend is preferably used.

It is preferable that the said heat insulation roof underglazing material 1 is 100-500 g / m < ² > of total weight. If it is 100 g / m ² or more, it is difficult to be affected by wind during construction. Moreover, since it is lightweight if it is 500 g / m < ² > or less, the workability | operativity at the time of construction improves.

  It is preferable that the total thickness of the heat-insulating roof underlaying material 1 is 300 to 1000 μm. If it is 300 micrometers or more, the tearing and tearing during work can be reduced. Moreover, if it is 1000 micrometers or less, a softness | flexibility will be good and workability will improve.

  It is preferable that the thermal insulation roof underlay material 1 has a tensile strength of 60 N / cm or more in the length direction, 40 N / cm or more in the width direction, and a tear strength of 10 N or more in the length direction and 10 N or more in the width direction. If this strength is satisfied, tearing and tearing during work can be reduced.

  It is preferable that the heat-insulating roof underlaying material 1 has a water pressure resistance of 30 kPa or more. If it is 30 kPa or more, even if rainwater or the like falls on the surface, moisture can be prevented from entering the inside.

The heat shielding roof underlaying material of the present invention will be specifically described with reference to the following examples and comparative examples, but the present invention is not limited thereto.
The roof underglazing materials of Examples 1 to 7 according to the present invention were manufactured, and their physical properties were measured. For comparison, the roof underglazing materials of Comparative Examples 1 to 4 were manufactured or obtained, and their physical properties were measured. Each physical property in Examples and Comparative Examples was measured by the following methods.

(1) Particle diameter of metal pigment and particle body The particle diameter and particle body of the metal pigment were measured according to JIS K 5600-9-3. When the particle body was a thermally expandable microcapsule, the thermally expandable microcapsule before thermal expansion was measured. Specifically, the particle size distribution was measured using a laser diffraction particle size distribution measuring device SALD-3100 manufactured by Shimadzu Corporation. The volume-based median diameter (D ₅₀ ) was calculated and determined. These results are not shown in the table.
(2) Infrared average reflectance The metal film layer 5 of each under-floor roof was evaluated by infrared average reflectance, and those having an average of 60% or more in the wavelength region of 5 to 10 µm were judged to have heat shielding properties. Infrared average reflectance was measured using a Fourier transform infrared spectrophotometer ((FT-IR) IR Prestige-21 manufactured by Shimadzu Corporation).
(3) Infrared average absorptivity For the metal film layer 5 of each roof underlaying material, an evaluation was performed with an infrared average absorptivity, and an average of 30% or less was judged to have a heat shielding property in a wavelength region of 5 to 10 μm. Infrared average absorptance is calculated by the above-mentioned formula by measuring the infrared average reflectance and the infrared average transmittance using a Fourier transform infrared spectrophotometer ((FT-IR) IR Prestig-21 manufactured by Shimadzu Corporation). did.
(4) Average Infrared Transmittance The binder 3 of each roofing roof material was evaluated with the average infrared transmittance. Moreover, what prepared the film used for the resin used in the binder 3 as a film to have a thickness of 80 μm was prepared using a Fourier transform infrared spectrophotometer ((FT-IR) Shimadzu Corporation IR Prestige-21). Infrared average transmittance was measured. It was judged that an average of 80% or more in the wavelength region of 5 to 10 μm had no influence on the heat shielding property of the metal pigment.
(5) Static Friction Coefficient Using a static friction coefficient tester (Tribogear Static Friction Coefficient Measuring Machine TYPE: 10, manufactured by Shinto Kagaku Co., Ltd.), the surface of the metal film layer 5 of each roofing material and craft paper (JIS P 3401 craft paper 1) The coefficient of static friction with the seed) was measured.
(6) Water resistance Each roof covering material was measured according to JIS A 6111.7.6. If it was 30 kPa or more, it was judged to be waterproof.
(7) Friction resistance Each roof covering was processed according to JIS L 0849 friction tester type II method, and peeling of the metal film layer was confirmed.
(8) Thermal insulation A roof model constructed in the order of F-type Japanese roof tile, ventilation layer 15mm, and under roof roofing material is produced, and the surface of the F-type Japanese roof tile is irradiated with a halogen lamp instead of sunlight. The back surface temperature of each roof underglazing when the surface of the tile reached 80 ° C. was measured with a radiation thermometer.
The temperature difference with asphalt roofing 940 (Tajima Applied Chemical Co., Ltd., P color) having a thickness of 1121 μm and a weight of 1099 g / m ² as defined in JIS A 6005 was confirmed, and the heat shielding property was evaluated.
Temperature difference [° C.] = Back surface temperature of asphalt roofing 940 [° C.] − Back surface temperature of each roofing roof material [° C.]
Evaluation criteria ○: 8 ° C. or more Δ: 6 ° C. or more and less than 8 ° C. x: Less than 6 ° C. (9) Anti-slip property 6-gradient (angle 30.9638 °) roof model is prepared, and each roof underlaying material on the base plate surface After pasting, we confirmed the sliding condition when walking on the surface of the roof under the roof.
Evaluation criteria ○: It is hard to slip and can walk safely. Δ: It slips a little, but it can walk safely. ×: It is slippery and dangerous. (10) Durability of the metal film layer. After each treatment of (10) -3, the corrosion state is visually confirmed, and the infrared reflectance is measured by the method described in the above (1), and the metal film layer is measured with the retention before and after the treatment. Check for corrosion.
Evaluation criteria ○: No discoloration is observed Δ: Some discoloration is observed ×: Discoloration is observed mostly (10) -1 Exposure resistance promotion Treated according to the durability of JIS A 61117.7, The reflectance of the metal film layer of the roof underglazing material was confirmed.
(10) -2 Acid resistance It processed according to JISK7114.4, and confirmed the reflectance of the metal film layer of each roof underlaying material.
Test temperature 23 ° C, immersion time 1 week, reagent nitric acid (concentration 10% by mass)
(10) -3 Alkali resistance It processed according to the alkali treatment of JIS A 601.37.5.2, and the reflectance of the metal film layer of each roof underlaying material was confirmed.

[Example 1]
The reinforcing layer 7 is a polyester nonwoven fabric (100 g / m ² spunbond, manufactured by Shinryo Co., Ltd.), the adhesive layer is a polyethylene resin (Perosen 212, manufactured by Tosoh Corporation), 40 μm, and the waterproof layer 6 is a polyethylene film ( Sakai Chemical Industry Co., Ltd., 60 μm) was laminated.
Next, 100 parts by weight of binder 3 (polyolefin resin, UPRY P-3963, Sakai Chemical Industries, Ltd., infrared average transmittance 88%, molecular weight 17814) is subjected to surface treatment of metal pigment 2 (acrylic organic coating). Scale-like aluminum, manufactured by Toyo Aluminum Co., Ltd., FZ7640, particle size 17 μm, 20 parts by weight, particle body 4 (acrylic thermally expandable microcapsule, manufactured by Matsumoto Yushi Seiyaku Co., Ltd., Microsphere F-30, particle size 14 μm, thermal expansion ratio 5 times, hydrocarbon n-butane) 10 parts by weight and solvent (toluene) 50 parts by weight was obtained. The liquid mixture is applied onto the waterproof layer 6 by a gravure coater, dried at a temperature of 130 ° C., heat-treated and coated to a thickness of 80 μm to form a metal film layer 5. 1 was obtained. The evaluation results are shown in Table 1.

[Example 2]
After forming the reinforcing layer 7, the adhesive layer, the waterproof layer 6, and the metal film layer 5 in the same manner as in Example 1, the polyester nonwoven fabric (100 g / m ² spunbond, manufactured by Shinryo Co., Ltd.) that is the reinforcing layer 7 is vertical. On the lower surface, a pressure-sensitive adhesive layer 9 (synthetic rubber-based adhesive, G207K, manufactured by Furuto Kogyo Co., Ltd.) is coated to a thickness of 100 μm by a calendar coating method, and the thermal barrier roof base material 1 as shown in FIG. Got. The evaluation results are shown in Table 1.

[Example 3]
A polyacrylate cross-linked product (WP-manufactured by Nikka Chemical Co., Ltd.) is formed as a water blocking layer 8 on the surface of the polyester nonwoven fabric (made by Shinryo Co., Ltd., 100 g / m ² spunbond) as the reinforcing layer 7. 01, water absorption swelling ratio 400 times) with a gravure coater so that the solid content is 15 g / m ² , and then a polyethylene resin as a waterproof layer 6 on the surface opposite to the surface on which the water blocking layer 8 is formed. (Tosoh Co., Ltd., Perotocene 212) was extruded and cooled by an extrusion laminating method to a thickness of 60 μm, and then the adhesive layer, waterproof layer 6 and metal film layer 5 were formed in the same manner as in Example 1. FIG. The heat insulation roof base material 1 like this was obtained. The evaluation results are shown in Table 1.

[Example 4]
Except having changed the metal pigment 2 from scale-like to powdery aluminum (91-2323T by Toyo Aluminum Co., Ltd.), it processed like Example 3 and obtained the thermal-insulation roof base material 1. FIG. The evaluation results are shown in Table 1.

[Example 5]
Except having changed the particle body 4 into the filler of zinc oxide (the Amtec Co., Ltd. make, Panatetra WZ-0511L), it processed similarly to Example 3 and obtained the thermal-insulation roof base material 1. FIG. The evaluation results are shown in Table 1.

[Example 6]
Except for changing the binder 3 to an acrylic resin having an infrared average transmittance of 69% and a molecular weight of 199130 (manufactured by Negami Kogyo Co., Ltd., Paracron W248E), it is processed in the same manner as in Example 3 to provide a thermal barrier roof base material. 1 was obtained. The evaluation results are shown in Table 1.

[Example 7]
Except for changing the metallic pigment 2 to scaly aluminum having a particle size of 16 μm that is not surface-treated (Toyo Aluminum Co., Ltd., 7675NS), the same processing as in Example 3 was performed to obtain a heat-shielding roof base material 1. It was. The evaluation results are shown in Table 1.

[Comparative Example 1]
Except that the particle body 4 was not blended, it was processed in the same manner as in Example 3 to obtain a heat shield roof base material 1. The evaluation results are shown in Table 1.

[Comparative Example 2]
Aluminum is vapor-deposited on the waterproof layer 6 by a vacuum vapor deposition method so as to have a thickness of 600 mm, and 10 parts by weight of the particles 4 and 50 parts by weight of toluene as a solvent with respect to 100 parts by weight of the binder 3 thereon. The heat-shielding roof base material 1 was obtained in the same manner as in Example 3 except that the added resin was coated with a gravure coater so that the thickness was 80 μm. The evaluation results are shown in Table 1.

[Comparative Example 3]
Except that the waterproof layer 6 was not laminated by the extrusion laminating method, it was processed in the same manner as in Example 3 to obtain a thermal barrier roof base material 1. The evaluation results are shown in Table 1.

[Comparative Example 4]
Table 1 shows the evaluation results of asphalt roofing 940 (P color, manufactured by Tajima Kappa Kako Co., Ltd.) defined in JIS A6005. Since the metal film layer was not provided, “wear resistance” and “durability of metal film layer” were not evaluated.

DESCRIPTION OF SYMBOLS 1 Heat shielding underfloor material 2 Metal pigment 3 Binder 4 Particle body 5 Metal film layer 6 Waterproof layer 7 Reinforcement layer 8 Water stop layer 9 Adhesive layer

Claims (5)

  The outermost layer on the upper side in the vertical direction is a metal film layer containing a metal pigment, a binder, and particles, and is a heat insulating roof covering material having at least a reinforcing layer and a waterproof layer under the metal film layer, A thermal insulating roof covering material characterized in that an infrared average reflectance in a wavelength region of 5 to 10 μm of the film layer is 60% or more and an infrared average absorptance in a wavelength region of 5 to 10 μm is 30% or less.   The heat insulating roof covering material according to claim 1, wherein the metal pigment has a scale shape.   The heat-insulating roof underlaying material according to claim 1 or 2, wherein at least one treatment selected from an organic coating treatment, an inorganic coating treatment, an oxide coating treatment, and a hydroxide coating treatment is applied to the surface of the metal pigment.   The thermal barrier roof covering material according to any one of claims 1 to 3, wherein the particulate body is at least one particulate body selected from inorganic powder and thermally expandable microcapsules.   The thermal barrier roof covering material according to any one of claims 1 to 4, wherein the binder has an infrared transmittance of 80% or more in a wavelength region of 5 to 10 µm.

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