Moisture permeable waterproof sheet for building material

Abstract

To provide an economical moisture permeable waterproof sheet excellent in moisture permeability capable of suppressing degradation even when being exposed to solar light for an extended period and having high waterproof performance over a long period after being installed inside of an outer wall as well as securing natural light even when interior construction before exterior construction.SOLUTION: Moisture permeable waterproof sheet for building material is configured to laminate a nonwoven fabric layer, an air permeable adhesive resin layer, and a permeable waterproof film layer, wherein total thickness of vapor permeable waterproof films used for the vapor permeable waterproof film layer is 50 to 100 μm, and ultraviolet average transmittance from 280 to 400 nm of the vapor permeable waterproof film layer is equal to or less than 2%. A moisture permeation resistance value measured in accordance with JIS A6111 for moisture permeable waterproof sheet for building material is equal to or less than 0.19 m2 s Pa / μg, visible light average transmittance of 400 to 700 nm is equal to or more than 8%, and ultraviolet average transmittance of 280 to 400 nm is equal to or less than 2%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a moisture-permeable waterproof sheet for building materials used as a base material for the exterior walls of houses. [Background technology]

[0002] Conventionally, methods for releasing moisture from within a wall to the outside have been developed, such as the exterior wall ventilation method. In the exterior wall ventilation method, a moisture-permeable waterproof sheet is generally installed on the exterior side of the insulation material to efficiently release moisture. Because these moisture-permeable waterproof sheets are installed on the inside of the exterior wall material, they are required to have long-term durability, such as tensile strength and water pressure resistance.

[0003] The applicant has proposed, for example, in Patent Documents 1 and 2, breathable waterproof sheets that are excellent in breathable waterproofing and heat-shielding performance and have long-term durability that can withstand harsh environments such as high temperatures and humidity. These have excellent breathable waterproofing and heat-shielding performance, but are not suitable for long-term exposure to sunlight before construction, and further durability is required. For example, the JIS durability evaluation has a rating of 44 MJ / m, assuming two months of exposure to sunlight. 2 However, in actual construction, exterior wall materials may be left unattended for much longer than two months, and long-term exposure to UV accelerates oxidation and deterioration within the exterior wall after construction, reducing its long-term durability, so it is necessary to suppress deterioration caused by UV. Furthermore, if a UV-reflecting metallized film or black film is used on the surface to suppress deterioration and achieve durable waterproofing, this increases costs and significantly reduces visible light transmittance, making it difficult to ensure sufficient brightness inside the building after construction, making it difficult to carry out interior work and other tasks before the exterior wall is installed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-076210 [Patent Document 2] Republished Patent No. 2015 / 151460 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above-mentioned problems, and aims to provide an inexpensive moisture-permeable waterproof sheet that has excellent moisture-permeable waterproof properties, is suppressed from deteriorating even when exposed to sunlight for a long period of time, maintains high waterproof performance for a long period of time even after being installed inside an exterior wall, and can ensure brightness even during interior construction before installing an exterior wall material. [Means for solving the problem]

[0006] The moisture-permeable waterproof sheet for building materials according to the present invention is a moisture-permeable waterproof sheet for building materials comprising a laminate of a nonwoven fabric layer, a breathable adhesive resin layer, and a moisture-permeable waterproof film layer, wherein the moisture-permeable waterproof film used in the moisture-permeable waterproof film layer has a total thickness of 50 to 100 μm, and the moisture-permeable waterproof film layer has an average ultraviolet transmittance of 280 to 400 nm of 2% or less, and the moisture-permeable waterproof sheet for building materials has a moisture permeation resistance value of 0.19 m / s as measured in accordance with JIS A6111. 2 ·s·Pa / μg or less, and has an average visible light transmittance of 400 to 700 nm of 8% or more and an average ultraviolet light transmittance of 280 to 400 nm of 2% or less.

[0007] The moisture-permeable waterproof film layer is preferably formed of two layers of moisture-permeable waterproof film with a breathable adhesive resin layer interposed therebetween. [Effects of the Invention]

[0008] To provide an inexpensive moisture-permeable waterproof sheet that is excellent in moisture permeability and waterproofness, suppresses deterioration even when exposed to sunlight for a long period of time, maintains high waterproof performance for a long period of time even after being installed inside an exterior wall, and can ensure brightness inside the building even during interior construction before the installation of the exterior wall. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing a moisture-permeable waterproof sheet for building materials according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing a moisture-permeable waterproof sheet for building materials, which is another example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The moisture-permeable waterproof sheet for building materials of the present invention will be described below with reference to the drawings. In the drawings, the multiple layers constituting the moisture-permeable waterproof sheet for building materials of the present invention are shown, but the thickness and size of each layer have been appropriately changed for ease of explanation and do not accurately reflect the relative thicknesses of the layers in an actual moisture-permeable waterproof sheet for building materials.

[0011] As shown in Fig. 1, the moisture-permeable waterproof sheet for building materials 1 of the present invention comprises a nonwoven fabric layer 2, a breathable adhesive resin layer 3, and a moisture-permeable waterproof film layer 4 laminated in this order. As shown in Fig. 2, the moisture-permeable waterproof film layer 4 may also comprise a laminate of a moisture-permeable waterproof film 41 and a moisture-permeable waterproof film 42, and the moisture-permeable waterproof film layer 4 may comprise a laminate of a plurality of moisture-permeable waterproof films.

[0012] The moisture-permeable waterproof sheet for building materials 1 is usually applied to the inside of an exterior wall material, with the nonwoven fabric layer 2 side of the moisture-permeable waterproof sheet for building materials 1 being installed on the outdoor side of the insulating material, and the moisture-permeable waterproof film layer 4 side of the moisture-permeable waterproof sheet for building materials 1 being installed on the indoor side of the exterior wall material.

[0013] A porous moisture-permeable waterproof film that can provide moisture permeability and waterproofness can be used as the moisture-permeable waterproof film layer 4 used in the present invention. Examples of materials for this film include polyolefin resins such as polyethylene and polypropylene, with polyethylene resins being preferred in terms of processability.

[0014] The moisture-permeable waterproof film may be any moisture-permeable waterproof film having fine pores, and examples of its production method include stretching a resin composition obtained by melt-kneading inorganic particles such as calcium carbonate or titanium oxide into a polyolefin resin, stretching a composition comprising a thermoplastic resin, a crystal nucleating agent, and an additive that is miscible with the thermoplastic resin and dissolves at the melting temperature of the thermoplastic resin but undergoes phase separation when cooled to a temperature below the crystallization temperature of the thermoplastic resin, or physically forming fine pores using a needle or embossing roll. Among these, the method of stretching a resin composition melt-kneaded with inorganic particles is preferred in terms of moisture permeability.

[0015] In a method of stretching a resin composition prepared by melt-kneading inorganic particles such as calcium carbonate or titanium oxide with a polyolefin resin, the inorganic particles preferably have an average particle size of 10 μm or less, more preferably 0.5 to 5 μm, and even more preferably 0.7 to 3 μm, on a volume basis. An average particle size within the above range ensures excellent dispersibility, facilitates the formation of continuous pores during stretching, and reduces the risk of tearing during film stretching. The weight ratio of the inorganic particles to be contained is preferably 40 to 60 wt %, more preferably 45 to 50 wt %, based on the total weight after mixing with the polyolefin resin. A content greater than 60 wt % may result in poor film formability, reduced mechanical strength, or tearing during stretching. Furthermore, a content less than 45 wt % may result in insufficient moisture permeability of the moisture-permeable, waterproof film after stretching. It is preferable that the inorganic particles be contained to such an extent that the moisture-permeable, waterproof film turns white.

[0016] The moisture-permeable and waterproof film can contain additives. Examples of such additives include antioxidants (hindered phenols, thioethers, phosphites, etc.), light stabilizers (benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, hindered amine-based light stabilizers, etc.), etc. These additives may be used alone or in combination.

[0017] The moisture permeability resistance value of the moisture-permeable and waterproof film layer 4 measured in accordance with JIS A6111 is 0.19m 2 ·s·Pa / μg or less, preferably 0.13m 2 ·s·Pa / μg or less, and more preferably 0.10m 2 ·s·Pa / μg or less. The moisture permeability resistance is 0.19m 2 If the moisture permeability resistance is greater than 1.0 s·Pa / μg, the moisture permeability and waterproof sheet for building materials 1 cannot ensure the required moisture permeability. 2 ·s·Pa / μg or more is preferable.

[0018] Furthermore, the average transmittance of ultraviolet light in the 280 to 400 nm range of the moisture-permeable, waterproof film layer 4 is 2% or less, and preferably 1.5% or less. If the average transmittance of ultraviolet light exceeds 2%, ultraviolet degradation will progress throughout the entire thickness of the moisture-permeable, waterproof film layer 4 when exposed to the outdoors, and if an exterior wall material is installed after outdoor exposure for more than four months, oxidation degradation over time that occurs inside the exterior wall will be accelerated, making it difficult to maintain waterproofness for a long period of time.

[0019] The average visible light transmittance of the moisture-permeable waterproof film layer 4 in the 400 to 700 nm range is preferably 10% or more. If the average visible light transmittance is less than 10%, when other layers are laminated to form the moisture-permeable waterproof sheet for building materials 1, sufficient brightness may not be ensured indoors after construction, which may reduce workability in the construction process after construction.

[0020] The waterproofness of the moisture-permeable, waterproof film layer 4 is preferably 5 to 120 kPa, and more preferably 6 to 100 kPa, as measured in accordance with the waterproofness evaluation (method B (high water pressure method)) of JIS A6111. If it is less than 5 kPa, the waterproofness may be insufficient, and if it is more than 120 kPa, the moisture permeability, which is the opposite of the waterproofness, may be significantly impaired.

[0021] The total thickness of the moisture-permeable waterproof film used in the moisture-permeable waterproof film layer 4 is preferably 50 to 100 μm, more preferably 60 to 90 μm. A thickness less than 50 μm may result in insufficient UV resistance. By limiting the average UV transmittance of the moisture-permeable waterproof film layer 4 to 2% or less and achieving a total thickness of 50 μm or more, UV damage can be limited to the surface layer of the film, maintaining the overall strength of the film. This prevents the accelerated oxidative degradation that occurs during long-term exposure within the wall after installation, maintaining excellent waterproofing. Furthermore, a total thickness greater than 100 μm may result in poor visible light transmittance, impairing indoor workability after installation and reducing flexibility, potentially impairing workability. Furthermore, when a method of stretching a resin composition melt-kneaded with inorganic particles is selected as a preferred method for producing a moisture-permeable waterproof film, a film that is too thick may make stretching difficult, preventing the formation of uniform pores and potentially failing to achieve the required moisture permeability.

[0022] The moisture-permeable, waterproof film layer 4 preferably has a tensile strength of 10 N / 25 mm or more in the longitudinal direction and 3 N / 25 mm or more in the transverse direction. If it is lower than these, problems such as film breakage may occur during lamination. In the present invention, the longitudinal direction and transverse direction refer to the length direction and width direction during film production, respectively.

[0023] The moisture-permeable, waterproof film layer 4 preferably has a tensile elongation at break of 10% or more in both the longitudinal and transverse directions. If it is less than 10%, workability during lamination may be impaired.

[0024] The moisture-permeable waterproof film layer 4 may be a moisture-permeable waterproof film and may be a single layer or multiple layers, but since increasing the number of layers increases manufacturing costs, one or two layers are preferred. As shown in Figure 2, if two layers of moisture-permeable waterproof film 41 and moisture-permeable waterproof film 42 are laminated via a breathable adhesive resin layer 5, damage from UV degradation is limited to the surface layer, and this is preferable. The breathable adhesive resin layer 5 will be described later.

[0025] The material of the nonwoven fabric layer 2 is preferably a nonwoven fabric made of polyester or polyolefin filament fibers in terms of strength, lightness, and cost. Polyester fibers are particularly preferred in terms of strength and durability. Examples of manufacturing methods include spunbond, meltblown chemical bond, thermal bond, spunlace, and needle punch. In particular, spunbond and meltblown manufacturing methods are preferred in terms of strength and post-processability.

[0026] The nonwoven fabric layer 2 has a basis weight of 30 to 150 g / m 2 is preferable, and more preferably 45 to 100 g / m 2 The weight of the nonwoven fabric layer 2 is 30 g / m 2 If the weight is less than 150 g / m, the moisture-permeable waterproof sheet for building materials 1 may not have sufficient strength. 2 If the thickness is larger, when the moisture-permeable waterproof sheet for building materials 1 is made, flexibility may not be obtained and workability may be significantly reduced.

[0027] In the moisture-permeable waterproof sheet for building materials 1 of the present invention, a breathable adhesive resin layer 3 is provided between the nonwoven fabric layer 2 and the moisture-permeable waterproof film layer 4, and a breathable adhesive resin layer 5 is provided between the moisture-permeable waterproof film layer 41 and the moisture-permeable waterproof film layer 42, and they are laminated together.

[0028] The adhesive resin used in the breathable adhesive resin layer 3 and the breathable adhesive resin layer 5 may be applied so as to provide breathability after lamination, and specific examples thereof include dot-like, spider web-like, etc. The application method may include a spray method, a dispenser method, a gravure method, etc.

[0029] The type of adhesive resin is appropriately selected depending on the materials of the nonwoven fabric layer 2 and the moisture-permeable, waterproof film layer 4. Examples include hot-melt adhesives such as olefin resins such as polyethylene resins, ethylene-vinyl acetate copolymer resins, polyurethane resins, and polyamide resins. Ethylene-vinyl acetate copolymer resins are preferred in terms of adhesive strength and cost. The adhesive resin may also contain additives such as known antioxidants, ultraviolet absorbers, flame retardants, and coloring pigments.

[0030] Furthermore, the thickness of the breathable adhesive resin layer 3 and the breathable adhesive resin layer 5 is preferably 30 μm or less, and more preferably 15 μm or less, from the standpoint of flexibility and workability.

[0031] In the present invention, a nonwoven fabric can be further laminated via a breathable adhesive resin layer to the outside of the moisture-permeable waterproof film layer 4, i.e., the surface facing the exterior wall material. By laminating a nonwoven fabric, waterproofness, strength, and durability can be improved, and it is also preferable in terms of scratch resistance for the moisture-permeable waterproof film layer 4. Like the material of the nonwoven fabric layer 2, the nonwoven fabric used here is preferably made of polyester or polyolefin filament fibers in terms of strength, lightness, and cost. There are no particular restrictions as long as it does not interfere with the concept of the present invention. In terms of ease of handling when working with a moisture-permeable waterproof sheet for building materials, the basis weight is 40 g / m 2 Preferably, it is 30 g / m or less. 2 It is more preferable that the thickness is 20 g / m or less because the strength can be maintained. 2 More preferably, it is equal to or greater than this.

[0032] The moisture permeable waterproof sheet for building materials 1 has a moisture permeability resistance value of 0.19m when measured in accordance with JIS A6111. 2·s·Pa / μg or less. Preferably 0.13m 2 ·s·Pa / μg or less, and more preferably 0.10m 2 ·s·Pa / μg or less. The moisture permeability resistance is 0.19m 2 If the resistance is greater than s·Pa / μg, it will be difficult to ensure the necessary moisture permeability as a moisture-permeable waterproof sheet for building materials. 2 ·s·Pa / μg or more is preferable.

[0033] The moisture-permeable waterproof sheet for building materials 1 has an average visible light transmittance of 8% or more in the 400 to 700 nm range. If the average visible light transmittance is less than 8%, sufficient brightness may not be ensured indoors after construction, which may reduce workability during the construction process. Furthermore, the average ultraviolet light transmittance in the 280 to 400 nm range is 2% or less, which allows the moisture-permeable waterproof film layer 4 to maintain its waterproof performance over the long term. Furthermore, a value of 2% or less also prevents the nonwoven fabric layer 2 from deteriorating due to ultraviolet light.

[0034] The waterproofness of the moisture-permeable waterproof sheet for building materials 1 is preferably 5 to 120 kPa, and more preferably 6 to 110 kPa. If it is less than 5 kPa, the waterproofness may be insufficient, and if it is more than 120 kPa, the moisture permeability may be significantly impaired.

[0035] The thickness of the moisture-permeable waterproof sheet for building materials 1 is preferably 70 to 250 μm, more preferably 100 to 180 μm. In the present invention, a film thickness of 50 μm or more is required, so if the combined thickness of the nonwoven fabric layer and breathable adhesive layer is less than 70 μm, the strength may be insufficient, and if it is thicker than 250 μm, the sheet may become hard and its workability may be impaired.

[0036] An example of a method for producing the moisture-permeable waterproof sheet for building materials 1 of the present invention will be described. An example of the manufacturing method of this embodiment is a method in which a breathable adhesive resin layer 3 is first provided on a nonwoven fabric layer 2, and then a moisture-permeable waterproof film layer 4 is laminated thereon. Another example is a method in which a breathable adhesive resin layer 3 is provided on a nonwoven fabric layer 2, a moisture-permeable waterproof film layer 41 is laminated thereon, a breathable adhesive resin layer 5 is provided on the surface of the moisture-permeable waterproof film layer 41, and then a moisture-permeable waterproof film layer 42 is bonded to the surface. [Example]

[0037] The moisture-permeable waterproof sheet for building materials 1 of the present invention will be specifically explained by the following examples and comparative examples, but the present invention is not limited to these. Measurement and evaluation of physical properties in the examples and comparative examples were carried out by the following methods.

[0038] <Moisture permeability (moisture permeability resistance value)> Measurements were made in accordance with JIS A6111 7.2 Moisture permeability. The cup used was the JIS moisture permeability test cup shown in Figure 2.

[0039] <Thickness> The thickness of each layer was measured using a thickness measuring instrument G-6 (manufactured by Ozaki Manufacturing Co., Ltd., measuring terminal anvil Φ5 flat, measuring force 1.8 N or less).

[0040] <Visible light average transmittance> Using a spectrophotometer (UV-3600 manufactured by Shimadzu Corporation), the visible light transmittance in the range of 400 to 700 nm was measured at 5 nm intervals, and the average value was calculated.

[0041] <Average ultraviolet transmittance> Using a spectrophotometer (UV-3600 manufactured by Shimadzu Corporation), the ultraviolet light transmittance in the range of 280 to 400 nm was measured at 5 nm intervals, and the average value was calculated.

[0042] <Waterproof> The waterproofness (unit: kPa) of the breathable waterproof film layer and the breathable waterproof sheet for building materials was determined in accordance with JIS A6111 7.5 Waterproofing. Waterproofing was measured using Method B (high water pressure method). The surface subjected to water pressure was the side facing the outside air during construction.

[0043] <Tensile strength> The test was carried out in accordance with JIS K7127. The test piece was type 2, the sample was 25 mm wide, 150 mm long, 50 mm between chucks, and the tensile speed was 100 mm / min. The strength was measured and the average value was calculated.

[0044] <Tensile elongation at break> The specimen was pulled to break under the same conditions as for the tensile strength, and the average value of the elongation at break was calculated.

[0045] <Waterproof durability evaluation> A four-month outdoor exposure test was conducted on the breathable waterproof sheet. The sheet was fixed to a plywood board that was placed vertically facing south using a tacker, and the periphery of the sheet was also taped with waterproof tape to prevent rainwater from getting on the backside of the sheet. The estimated energy of ultraviolet rays was 110±4MJ / m 2 The samples after the exposure test were then subjected to the waterproofing test described above. Furthermore, they were subjected to heat treatment for 7 weeks and 17 weeks at 90°C using a constant temperature incubator (Yamato Scientific Co., Ltd. DKM600) with an air exchange rate of 50 to 70 times per hour, and then to a waterproofing test. Furthermore, assuming a periodic high humidity environment, once a week the measurement sample breathable waterproof sheet for building materials was removed from the constant temperature incubator and the surface facing the exterior wall was sprayed with water to moisten it. The spray amount was 50-80g / m 2 The evaluation criteria were as follows: 20kPa or more:○ 8kPa or more but less than 20kPa: △ Less than 8kPa: ×

[0046] <Indoor workability> A cube with sides of 2m was created using wooden square pillars, and the sheets created were attached tightly with adhesive tape to the five sides of the cube excluding the floor. Workability was evaluated using the following criteria to see if a worker with 1.5 vision could recognize the characters on a document (font size: 11, black Mincho font) from a distance of 40cm inside the cube. Characters are easily recognizable: The characters are hard to read but recognizable: △ Characters not recognized: ×

[0047] [Example 1] Resin pellets were prepared by mixing 40% by weight of linear low-density polyethylene resin (Novatec LL UF-442, manufactured by Japan Polyethylene Co., Ltd., melting point 123°C, density 0.924, melt flow rate 1.7) with 9.5% by weight of low-density polyethylene resin (Novatec LD LF-240, manufactured by Japan Polyethylene Co., Ltd., melting point 114°C, density 0.924, melt flow rate 0.7), 49% by weight of heavy calcium carbonate inorganic particles (KS-800, manufactured by Calfine Co., Ltd., average particle size 2.8 μm), 1% by weight of titanium oxide inorganic particles (JR-403, manufactured by Teika Co., Ltd., average particle size 0.25 μm), 0.1% by weight of ultraviolet absorber (Adeka STAB 1413, manufactured by ADEKA Corporation), and light stabilizer (Adeka STAB LA-63P, manufactured by Teika Co., Ltd.). The mixture was mixed in a tumbler mixer, then melted and kneaded in a co-rotating twin-screw extruder at 210°C, homogenized, and extruded into a film through a T-die. The film was then stretched 3.5 times in the longitudinal direction to obtain a white, moisture-permeable, waterproof film with a thickness of 80 μm. The moisture permeation resistance of the resulting moisture-permeable, waterproof film was 0.12 m. 2 Other physical properties are shown in Table 1.

[0048] The obtained moisture-permeable and waterproof film was mixed with a polyester spunbond nonwoven fabric (20457FLV: manufactured by Unitika Ltd., basis weight 45 g / m 2The desired moisture-permeable waterproof sheet for building materials was obtained by bonding the two sheets together with an ethylene vinyl acetate hot-melt resin. The amount of hot-melt resin applied was 6 g / m. 2 The hot-melt resin layer after bonding was 15 μm thick. The evaluation results of the obtained moisture-permeable waterproof sheet for building materials are shown in Table 1.

[0049] [Example 2] The same polyethylene resin kneaded material as in Example 1 was extruded through a T-die, and then stretched 3.5 times in the length direction to form a film, to obtain a white moisture-permeable and waterproof film with a thickness of 30 μm. A moisture-permeable waterproof sheet for building materials was obtained in the same manner as in Example 1, except that two layers of the obtained moisture-permeable waterproof film were laminated. The moisture-permeable waterproof films were bonded together using the same hot-melt resin as used to bond the nonwoven fabric in Example 1 at a concentration of 4 g / m. 2 The coating was carried out at 112°C under a pressure of 3 kgf. The resulting moisture-permeable waterproof sheet for building materials had two layers of moisture-permeable waterproof film, with a total thickness of 60 μm and a hot-melt resin layer between the films of 10 μm. The physical properties and evaluation results are shown in Table 1.

[0050] [Example 3] The composition is 56% by weight of linear low-density polyethylene resin (Novatec LL UF-442: manufactured by Japan Polyethylene Co., Ltd., melting point 123°C, density 0.924, melt flow rate 1.7), 42.5% by weight of heavy calcium carbonate inorganic particles (KS-800: manufactured by Calfine Co., Ltd., average particle size approximately 2.8 μm), 1% by weight of titanium oxide inorganic particles (JR-403: manufactured by Teika Co., Ltd., average particle size 0.25 μm), and an ultraviolet absorber (ADEKA STAB 1413: manufactured by ADEKA Corporation). ), 0.1 wt % of a light stabilizer (ADK STAB LA-63P, manufactured by ADEKA CORPORATION), 0.2 wt % of a primary antioxidant (ADK STAB AO-60, manufactured by ADEKA CORPORATION), and 0.1 wt % of a secondary antioxidant (ADK STAB 2112, manufactured by ADEKA CORPORATION) were added, and the mixture was kneaded in the same manner as in Example 1. A film was extruded through a T-die and stretched to obtain a white moisture-permeable, waterproof film with a thickness of 60 μm. The resulting moisture-permeable waterproof film was attached to a nonwoven fabric in the same manner as in Example 1 to obtain a moisture-permeable waterproof sheet for building materials. The physical properties and evaluation results are shown in Table 1.

[0051] [Example 4] A white moisture-permeable waterproof sheet for building materials was obtained in the same manner as in Example 3, except that the thickness of the moisture-permeable waterproof film was changed to 80 μm. The physical properties and evaluation results are shown in Table 1.

[0052] [Example 5] A moisture-permeable waterproof sheet for building materials was obtained by forming two layers of the moisture-permeable waterproof film in the same manner as in Example 2, except that the thickness of the moisture-permeable waterproof film in Example 2 was changed to 45 μm. The physical properties and evaluation results are shown in Table 1.

[0053] [Example 6] A polyester spunbond nonwoven fabric (Acstar N1030, manufactured by Toray Industries, Inc., basis weight 30 g / m) was applied to the surface of the moisture-permeable waterproof film of the moisture-permeable waterproof sheet for building materials produced in Example 2. 2 The bonding conditions were the same as for bonding moisture-permeable waterproof films together, and a moisture-permeable waterproof sheet for building materials was obtained. The physical properties and evaluation results are shown in Table 1.

[0054] [Example 7] A polyester spunbond nonwoven fabric (Axstar N1030, manufactured by Toray Industries, Inc., basis weight 30 g / m) was applied to the surface of the moisture-permeable waterproof film of the moisture-permeable waterproof sheet for building materials produced in Example 3. 2 The bonding conditions were the same as for bonding moisture-permeable waterproof films together, and a moisture-permeable waterproof sheet for building materials was obtained. The physical properties and evaluation results are shown in Table 1.

[0055] [Comparative Example 1] A moisture-permeable waterproof sheet for building materials was obtained in the same manner as in Example 1, except that the heavy calcium carbonate inorganic particles were changed to 49.7 wt%, the titanium oxide inorganic particles were changed to 0.3 wt%, no ultraviolet absorber, light stabilizer, or antioxidant was added, and the thickness of the moisture-permeable waterproof film was changed to 60 μm. The physical properties and evaluation results are shown in Table 1.

[0056] Comparative Example 2 A moisture-permeable waterproof sheet for building materials was obtained in the same manner as in Example 1, except that the thickness of the moisture-permeable waterproof film was changed to 30 μm. The physical properties and evaluation results are shown in Table 1.

[0057] Comparative Example 3 To 99.8 wt% resin pellets of polypropylene resin (Novatec PP FL203D, manufactured by Japan Polypropylene Corporation; melting point 160-165°C, density 0.90, melt flow rate 3.0), 0.1 wt% of UV absorber (ADK STAB 1413, manufactured by ADEKA Corporation) and 0.1 wt% of light stabilizer (ADK STAB LA-63P, manufactured by ADEKA Corporation) were added. The mixture was mixed in a tumbler mixer, then melted, kneaded, and homogenized in a co-rotating twin-screw extruder at 250°C. The resulting film was extruded through a T-die and cooled. The film was stretched 4.5 times in the longitudinal direction using stretching rolls at 130°C, and then 8 times in the transverse direction at 160°C, yielding a 20 μm-thick biaxially oriented polypropylene film. An aluminum vapor-deposited film was formed on the obtained biaxially oriented polypropylene film by vacuum deposition, and then through-holes with a diameter of 0.5 mm were formed in both the vertical and horizontal directions at intervals of 1.5 mm by punching to obtain an aluminum vapor-deposited polypropylene film with an opening rate of 13%. The obtained aluminum vapor-deposited polypropylene film was applied to the surface of the moisture-permeable waterproof film of the moisture-permeable waterproof sheet for building materials produced in Comparative Example 2, and an ethylene vinyl acetate hot-melt resin was applied in an amount of 4 g / m. 2 The mixture was applied in a spider web pattern at 100°C and a pressure of 3 kgf to form the desired moisture-permeable waterproof sheet for building materials. The physical properties and evaluation results are shown in Table 1.

[0058] [Table 1]

[0059] As shown in Table 1, the moisture-permeable waterproof sheet of the example had excellent moisture-permeable waterproof properties, was less susceptible to deterioration even when exposed to sunlight for a long period of time, and maintained high waterproof performance for a long period of time even after installation inside the exterior wall. [Explanation of symbols]

[0060] 1. Breathable waterproof sheet for building materials 2 non-woven layers 3 Breathable adhesive resin layer 4 breathable and waterproof film layers 41 Breathable and waterproof film 42 Breathable and waterproof film 5 Breathable adhesive resin layer

Claims

1. A moisture-permeable waterproof sheet for building materials, comprising a nonwoven fabric layer, a breathable adhesive resin layer, and a moisture-permeable waterproof film layer laminated together, The total thickness of the moisture-permeable and waterproof film used in the moisture-permeable and waterproof film layer is 50 to 100 μm, The moisture-permeable and waterproof film layer has an average transmittance of 2% or less for ultraviolet rays of 280 to 400 nm, The moisture permeability resistance value measured in accordance with JIS A6111 for the moisture-permeable waterproof sheet for building materials is 0.19 m ２ s·Pa / μg or less, and the average transmittance of visible light in the range of 400 to 700 nm is 8% or more, and the average transmittance of ultraviolet light in the range of 280 to 400 nm is 2% or less. Breathable waterproof sheet for building materials.

2. 2. The moisture-permeable waterproof sheet for building materials according to claim 1, wherein the moisture-permeable waterproof film layer is formed of two layers of moisture-permeable waterproof film with a breathable adhesive resin layer interposed therebetween.

Images