Membrane material and method for producing the same

Abstract

The primary problem addressed by the present invention is to provide a membrane material for a membrane ceiling having excellent sound absorption, antifouling properties, and mold resistance even when installed as the membrane ceiling of, for example, an indoor pool.　A membrane material used as a membrane ceiling inside a building, the membrane material including a glass fiber fabric, resin covering the glass fibers constituting the glass fiber fabric, and an antimold agent contained in the resin, the membrane material having air permeability of 1-40 cm3 / cm2 / second, the total amount of resin being 20-60 g / m2, and no development of hyphae being found even when cultured for four weeks in a mold resistance test measured according to the wet method set forth in the column "7. Fiber product test" of the "Mold resistance test method" of JIS Z 2911-2010.

Description

[Technical field]

[0001] The present invention relates to a membrane material and a method for producing the same. [Background technology]

[0002] In the Great East Japan Earthquake that occurred in Japan on March 11, 2011, ceilings of buildings with large spaces such as gymnasiums collapsed, causing damage and losing lives in some facilities. In order to prevent damage caused by ceiling collapse during earthquakes, Japan amended the Building Standards Act Enforcement Order in July 2013 and promulgated the "Series of Technical Standards Notifications Concerning Measures Against Ceiling Collapse (Ministry of Land, Infrastructure, Transport and Tourism Notification No. 771 of 2013, etc.)" in August of the same year (effective from April 1, 2014). As a result, if a building falls under the category of a "special ceiling," it is mandatory to take measures to prevent falling in accordance with these technical standards. In response to these developments, membrane ceilings made of glass fiber fabric, which is fireproof and relatively light, have been attracting attention in recent years.

[0003] A known glass cloth for membrane ceilings is made by weaving warp and weft yarns, in which one yarn is a non-bulky glass fiber yarn and the other yarn is a bulky glass fiber yarn, the sum of the weave density of the non-bulky glass fiber yarn and the weave density of the bulky glass fiber yarn is 80 to 93 yarns / 25 mm, the ratio (B / A) of the weave density A of the non-bulky glass fiber yarn and the weave density B of the bulky glass fiber yarn is 0.65 to 0.95, the weave structure of the glass cloth is a double weave, and the opening ratio of the glass cloth is 0.02 to 1.0% (see, for example, Patent Document 1). This glass cloth for membrane ceilings uses bulky glass fiber yarn, has a double weave structure, and has a specific weaving density, which gives it excellent sound absorption properties, including excellent sound absorption in the low frequency range that is the frequency range of human voices, and is said to suppress echoes of human voices when used as a ceiling membrane.

[0004] Also, a sound-absorbing noncombustible sheet is known, which is a laminate comprising a fiber fabric woven from multifilament yarn as an air-permeable diffusion layer, and a thermoplastic resin layer covering at least one side of the fiber fabric, and a large number of vent holes with a hole diameter of 0.5 to 2.5 mm are formed in a scattered manner on the entire surface of the laminate, the total area of ​​the vent holes has an open area ratio of 2.5 to 12.5% ​​per unit area of ​​the laminate, and the thermoplastic resin layer contains thermally expandable particles in an amount of 1.5 to 10% by mass relative to the thermoplastic resin layer. According to the sheet, a noncombustible interior material having sound absorption properties as a ceiling area component and sound absorbing component installed on the ceiling of a building, or an accessory of a ceiling area component, is obtained, and these membrane materials are lightweight and flexible so that they are unlikely to cause serious human damage even if they collapse due to an earthquake, while having excellent echo suppression and sound attenuation effects. For this reason, the sheet is said to be widely usable as a membrane ceiling in indoor stadiums, gymnasiums, indoor pools, event halls, public halls, wedding and funeral halls, station lobbies, airport lobbies, shopping mall atriums, etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2014 / 171188 Brochure [Patent Document 2] JP 2016-186533 A Summary of the Invention [Problem to be solved by the invention]

[0006] The glass cloth for membrane ceilings disclosed in the examples of Patent Document 1 is made of only woven glass fibers and does not contain resin, which causes problems such as poor surface smoothness and poor ability to remove dirt once attached to the membrane material (hereinafter sometimes abbreviated as "anti-fouling property").

[0007] On the other hand, the sound-absorbing non-combustible sheet of Patent Document 2 has antifouling properties because the surface of the glass fiber contains resin. In order to enhance sound absorption, the membrane material of the membrane ceiling is designed to have a specific aperture ratio. However, the inventors of the present invention have found that the membrane material of Patent Document 2 has a problem that, when installed as a membrane ceiling of an indoor pool, for example, it cannot suppress the generation of mold, resulting in a poor appearance.

[0008] Therefore, the main object of the present invention is to solve the above problems and to provide a membrane material for membrane ceilings which has excellent sound absorption, stain resistance, and mold resistance even when installed as a membrane ceiling for an indoor swimming pool, for example. [Means for solving the problem]

[0009] As a result of the inventors' study, the membrane material of Patent Document 2 has air holes with a specific porosity ratio to provide excellent sound absorption, but the presence of the air holes has made it particularly susceptible to mold. Specifically, the inventors have found that water that evaporates from the pool and comes into contact with the membrane ceiling is likely to accumulate in the small air holes in the membrane ceiling, and mold is likely to occur from the air holes. In other words, the inventors have found that a membrane material with excellent sound absorption properties that has air holes requires particularly high antifungal performance, more specifically, antifungal performance to the extent that no hyphae are observed after 4 weeks in a mold resistance test measured in accordance with JIS Z 2911-2018 7 wet method.

[0010] Here, if one were to simply impart high antifungal performance to the membrane material, one might consider increasing the amount of antifungal agent. However, when increasing the amount of antifungal agent, it is also necessary to increase the amount of resin that serves as the binder component of the antifungal agent. The inventors have found that if the amount of binder resin is increased excessively, the air holes necessary for achieving excellent sound absorption performance will be filled with resin, resulting in poor sound absorption performance. In addition, the total organic matter amount (g / m2) including the antifungal agent and the resin that serves as the binder component 2It was found that if the amount of resin is relatively reduced and the amount of antifungal agent is relatively increased while leaving the above-mentioned properties unchanged, the smoothness of the resulting film material tends to deteriorate and the antifouling properties cannot be maintained. In other words, it was found that there is a trade-off between sound absorption performance and antifouling properties on the one hand and antifungal properties on the other.

[0011] As a result of extensive research, the present inventors have found that the amount of resin that can achieve both antifouling and sound absorption properties in a film material containing a glass fiber fabric and a resin contained on the upper surface of the glass fiber is 20 to 60 g / m 2 and by making the antifungal agent contained in the resin exist relatively more on the surface side of the resin, it has been found that it is possible to simultaneously achieve sound absorption, antifouling properties, and the high antifungal performance required for installation as a membrane ceiling for an indoor swimming pool, for example. The present invention has been completed based on this knowledge and through further investigation.

[0012] That is, the present invention provides the following aspects. Item 1. A membrane material used as a membrane ceiling in a building, Glass fiber fabric; A resin that coats glass fibers constituting the glass fiber fabric; A fungicide contained in the resin, The membrane material has a breathability of 1 to 40 cm 3 / cm 2 / sec, The total mass of the resin is 20 to 60 g / m 2 and A membrane material in which no mycelium growth is observed even after 4 weeks of incubation in a mold resistance test measured in accordance with the wet method described in the "7. Testing of textile products" section of the Japanese Industrial Standard JIS Z 2911-2010 "Mold resistance test method." Item 2. The membrane material according to Item 1, wherein the antifungal agent is a pyridine-based antifungal agent. Item 3. The membrane material according to item 1 or 2, wherein the resin comprises a polyurethane-based resin, and an ethylene-vinyl acetate copolymer and / or a vinyl chloride-(meth)acrylic acid ester copolymer. Item 4. A membrane ceiling comprising the membrane material according to any one of items 1 to 3. Item 5. Use of the membrane material according to any one of items 1 to 3 as a membrane ceiling. Item 6. A method for producing the membrane material according to any one of items 1 to 3, comprising the following steps (1) to (3): (1) A step of preparing a glass fiber fabric. (2) A first resin application step in which a resin is applied to the surface of the glass fibers constituting the glass fiber fabric to obtain an intermediate membrane material. (3) A second resin adhering step of adhering a resin having a higher content of antifungal agent than the resin adhered in the first resin adhering step to the membrane material intermediate. Effect of the Invention

[0013] According to the present invention, it is possible to provide a membrane material for membrane ceilings which has excellent sound absorption properties, antifungal properties and antifouling properties even when installed as a membrane ceiling for an indoor swimming pool, for example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The membrane material of the present invention is a membrane material used as a membrane ceiling in a building, and includes a glass fiber fabric, a resin that coats the glass fibers constituting the glass fiber fabric, and a fungicide contained in the resin. The membrane material has an air permeability of 1 to 40 cm. 3 / cm 2 / sec, and the total mass of the resin is 20 to 60 g / m 2 The membrane material of the present invention is characterized in that no mycelium growth is observed even after 4 weeks of culture in a mold resistance test measured according to the wet method described in the section "7. Testing of Textile Products" of the Japanese Industrial Standards JIS Z 2911-2010 "Mold Resistance Test Method." The components of the membrane material of the present invention will be described in detail below.

[0015] <Glass fiber fabric> The membrane material of the present invention contains a glass fiber fabric. This makes it easier to improve fire resistance while making the membrane material of the present invention relatively lightweight when used for a membrane ceiling, and also improves sound absorption properties.

[0016] The glass material constituting the glass fiber is not particularly limited, and known glass materials can be used. Specific examples of the glass material include alkali-free glass (E glass), acid-resistant alkali-containing glass (C glass), high-strength, high-elasticity glass (S glass, T glass, etc.), and alkali-resistant glass (AR glass).

[0017] The form of the glass fibers (warp and weft) constituting the glass fiber fabric is not particularly limited, and examples thereof include long fibers such as monofilaments and multifilaments, and short fibers such as spun yarns. Among them, from the viewpoint of improving the bonding between two woven fabrics to be bonded to increase the area of ​​the membrane material of the present invention, it is preferable to use a yarn in which a plurality of single fibers, which are long fibers, are twisted together. Furthermore, from the viewpoint of effectively adjusting the gaps between the warps and the wefts even with a relatively low weaving density and making it easier to improve the sound absorption and fire resistance when the membrane material is used as a membrane ceiling, the glass fibers constituting the glass fiber fabric are preferably a plied yarn in which a plurality of the above-mentioned yarns are twisted together in the opposite direction to the twist direction of the yarn, and more preferably a plied yarn in which 2 to 4 of the above-mentioned yarns are twisted together in the opposite direction to the twist direction of the yarn. The number of twists (first twist number) of the plied yarn is preferably 2 to 5 times / 25 mm, and more preferably 3.0 to 4.5 times / 25 mm. The glass fibers constituting the glass fiber fabric may be bulky-textured yarns obtained by processing the above-mentioned yarns to be bulky with an air jet or the like. Among the bulky-textured yarns, a bulky-textured yarn obtained by processing a double-twisted yarn obtained by twisting a plurality of the above-mentioned yarns in the direction opposite to the twisting direction of the yarns to be bulky with an air jet or the like is preferable. Among the above-mentioned bulky-textured yarns, from the viewpoint of further achieving both the suppression of wrinkles in the membrane material, sound absorption properties, and non-flammability, a bulky-textured yarn obtained by twisting a double-twisted yarn obtained by twisting 2 to 4 of the above-mentioned yarns twisted in the S direction or Z direction in the direction opposite to the yarns to be bulky with an air jet or the like is more preferable.

[0018] The combination of warp and weft yarns in the glass fiber fabric is not particularly limited, but examples thereof include a combination in which the warp and weft yarns are both ply-twisted yarns, or a combination in which one of the warp and weft yarns is a ply-twisted yarn and the other is a bulky-textured yarn.

[0019] The number of single fibers in the yarn is not particularly limited, but is preferably 30 to 800, and more preferably 100 to 800. The diameter of the single fiber in the yarn is, for example, 3.0 to 12.0 μm, and preferably 5.0 to 9.0 μm. The yarn count is, for example, 10 to 1000 tex, and preferably 100 to 500 tex.

[0020] When the above-mentioned ply-twisted yarn is used as the glass fiber yarn constituting the glass fiber fabric, the yarn count of the ply-twisted yarn can be, for example, 50 to 500 tex, preferably 50 to 200 tex, and more preferably 100 to 180 tex. When the above-mentioned bulky-textured yarn is used as the glass fiber yarn constituting the glass fiber fabric, the yarn count of the bulky-textured yarn can be, for example, 100 to 500 tex, preferably 200 to 400 tex, and more preferably 250 to 350 tex.

[0021] In the present invention, the weave of the glass fiber fabric is not limited, and examples thereof include plain weave, satin weave, twill weave, basket weave, rib weave, warp double weave, weft double weave, double weave, etc. Among them, plain weave is preferred from the viewpoint of further suppressing the occurrence of wrinkles and swelling of the membrane material and further enhancing the aesthetic appearance when used as a membrane ceiling.

[0022] In the present invention, the weave density of the glass fiber fabric is not particularly limited. For example, it can be appropriately adjusted for the purpose of further improving the non-combustibility and sound absorption when made into a membrane ceiling, and for example, 10 to 200 threads / 25 mm can be mentioned, 10 to 100 threads / 25 mm can be mentioned, and 15 to 40 threads / 25 mm can be mentioned more preferably. In this case, if the interval between the warp threads and the interval between the weft threads are set to 0.5 mm or less, it is easy to obtain a fabric with better non-combustibility. In addition, the ratio of the weave density of the warp threads to the weft threads (weave density of the weft threads / weave density of the warp threads) can be 0.50 to 0.99, preferably 0.75 to 0.99, and more preferably 0.94 to 0.99, from the viewpoint of further improving the sound absorption when made into a membrane ceiling.

[0023] In the present invention, from the viewpoint of achieving better sound absorption when the membrane material is used for a membrane ceiling, the glass fiber fabric preferably has a cover factor of 2000 to 2400, more preferably 2100 to 2300. In the present invention, the cover factor Cf of the glass fiber fabric is a value calculated according to the following formula. Cf = T × (DT) 1 / 2 +W×(DW) 1 / 2 ...(Formula 1) Here, T and W respectively indicate the warp density and weft density (threads / 25 mm) of the fabric, and DT and DW respectively indicate the count (dtex) of the warp and weft threads constituting the fabric.

[0024] The mass of the glass fiber fabric used in the present invention is not particularly limited, but from the viewpoint of further improving the fireproofness, sound absorption and stain resistance when used as a membrane ceiling, it is preferably 250 to 500 g / m 2 and 300 to 400 g / m 2 are more preferred.

[0025] The glass fiber fabric used in the present invention may contain polyvinyl alcohol and / or starch on the surface. Polyvinyl alcohol and / or starch are used, for example, as sizing agents for glass fiber fabrics, and can usually be removed (de-oiled) by a heat cleaning treatment in which heat treatment is performed at a temperature of about 400° C. On the other hand, in the present invention, by using a glass fiber fabric from which the sizing agent has not been removed, i.e., a glass fiber fabric that has not been subjected to a heat cleaning treatment, the mechanical strength of the membrane material can be further improved.

[0026] <Resin> The membrane material of the present invention includes a resin that covers the glass fibers that constitute the above-mentioned glass fiber fabric. That is, the membrane material of the present invention includes a resin that is included on the upper surface of the above-mentioned glass fibers. If the membrane material is made of only glass fiber fabric, as in the membrane material disclosed as an example in Patent Document 1, it is difficult to remove dirt such as dust that has entered the gaps between the single fibers in the glass fibers by wiping it off. On the other hand, according to the membrane material of the present invention, since the surface of the glass fiber is covered with a resin, the intrusion of dirt into the gaps between the single fibers in the glass fibers is reduced, and the smoothness of the membrane material is improved, making it possible to provide a membrane material with excellent anti-fouling properties. In addition, in the membrane material of the present invention, the resin also plays a role in adjusting the size of the gaps (openings) formed by the warp and weft threads of the glass fiber fabric, thereby making the membrane material excellent in sound absorption. Furthermore, in the membrane material of the present invention, the resin also plays a role in preventing water that has evaporated from the pool and come into contact with the membrane ceiling from accumulating in the gaps between the single fibers in the glass fibers, and preventing mold from easily occurring from the gaps between the glass fibers.

[0027] The type of resin used in the film material of the present invention is not particularly limited. Examples of resins include curable resins such as vinyl ester resins, urethane acrylate resins, fluorene acrylate resins, and unsaturated polyester resins; vinyl chloride resins (including homopolymers of vinyl chloride and copolymers of vinyl chloride and other monomers), acrylic resins (including polymers and copolymers of acrylic acid, acrylic acid esters, acrylamide, acrylonitrile, methacrylic acid, methacrylic acid esters, etc.), polyurethane resins, fluorine resins, ethylene-vinyl acetate copolymers, saturated polyester resins, and thermoplastic resins such as polyamide resins. These resins may be used alone or in combination of two or more. Among these resins, from the viewpoint of achieving better antifouling properties, polyurethane resins, fluorine resins, ethylene-vinyl acetate copolymers, vinyl chloride resins, and acrylic resins are preferred, and it is more preferred to use polyurethane resins in combination with ethylene-vinyl acetate copolymers and / or vinyl chloride-(meth)acrylic acid ester copolymers. That is, when a membrane material is used to form a membrane ceiling, the membrane material may be enlarged in area, and the enlargement is usually achieved by bonding the membrane materials together by heat welding or the like. Polyurethane resins are preferred in that they can further improve the bonding property by heat welding and the antifouling property. Ethylene-vinyl acetate copolymers and vinyl chloride-(meth)acrylic acid ester copolymers are preferred in that they can improve the water repellency of the membrane material while improving the bonding property, and can easily prevent water that has evaporated from the pool and contacted the membrane ceiling from accumulating in the gaps (openings) formed by the warp and weft of the glass fiber fabric. Therefore, by using polyurethane resins in combination with ethylene-vinyl acetate copolymers and / or vinyl chloride-(meth)acrylic acid ester copolymers, the bonding property by heat welding, the antifouling property, and the antifungal property can be further improved.

[0028] When a polyurethane resin is used in combination with an ethylene-vinyl acetate copolymer and / or a vinyl chloride-(meth)acrylic acid ester copolymer as the resin, the ratio of the total amount of the ethylene-vinyl acetate copolymer and / or the vinyl chloride-(meth)acrylic acid ester copolymer contained in the membrane material of the present invention to 100 parts by mass of the total amount of the polyurethane resin contained in the membrane material of the present invention is, for example, 5 to 500 parts by mass, preferably 5 to 400 parts by mass.

[0029] In the present invention, the polyurethane resin is a resin having a urethane bond in the repeating unit of the main chain. Examples of the isocyanate component constituting the polyurethane resin include aliphatic diisocyanates such as ethylene diisocyanate, hexamethylene diisocyanate, and decamethylene diisocyanate, alicyclic diisocyanates such as xylylene diisocyanate, bis(isocyanomethyl)cyclohexane, hydrogenated diphenylmethane diisocyanate, and hydrogenated tolylene diisocyanate, diisocyanate compounds such as aromatic diisocyanates such as phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, dimethyldiphenylene diisocyanate, and naphthylene diisocyanate, and isocyanate compounds such as isophorone diisocyanate, 1,3-cyclohexane diisocyanate, tetramethylene diisocyanate, and triphenylmethane triisocyanate. Examples of the polyol component constituting the polyurethane resin include polyester polyols, polyether polyols, polycarbonate polyols, polyesteramide polyols, and acrylate polyols.

[0030] The total mass of the resin in the membrane material of the present invention is 20 to 60 g / m 2 The total mass of the resin is 20 g / m 2 If the total mass of the resin is less than 60 g / m, the stain resistance will be poor. 2If it exceeds this range, the gaps formed by the warp and weft of the glass fiber fabric become too small, resulting in poor air permeability and poor sound absorption. From the viewpoint of achieving even greater balance between sound absorption, mildew resistance, stain resistance, and non-combustibility of the film material, the total mass of the resin in the film material of the present invention is preferably 20 to 50 g / m 2 , more preferably 30 to 50 g / m 2 In the present invention, the "total mass of resin" refers to the total mass of all resins coating the glass fiber, and for example, when two or more resin layers are provided as the resin coating the glass fiber as described later, it refers to the total mass of resin contained in all the resin layers.

[0031] In addition, in the membrane material of the present invention, the mass (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / mass of glass fiber fabric) is, for example, 0.05 to 0.2. From the viewpoint of achieving a balance between sound absorption, mildew resistance, and stain resistance of the film material, the ratio (total mass of resin / mass of glass fiber fabric) is preferably 0.08 to 0.15.

[0032] In addition, in the membrane material of the present invention, the total mass (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resins / total mass of membrane material) is, for example, 0.05 to 0.2. From the viewpoint of achieving even better balance between sound absorption, antifungal properties, and antifouling properties of the membrane material, the ratio (total mass of resins / total mass of membrane material) is preferably 0.08 to 0.12.

[0033] <Anti-mold agent> In the film material of the present invention, the resin coating the glass fiber fabric contains an antifungal agent. As described above, in a film material having excellent sound absorption properties due to the provision of voids (openings), mold is likely to grow, so it is necessary to have a particularly high antifungal performance, more specifically, the antifungal performance described below. Therefore, in order to provide the film material of the present invention with high antifungal performance, the resin coating the glass fiber fabric contains an antifungal agent.

[0034] The type of antifungal agent is not particularly limited, but a suitable example is a pyridine-based antifungal agent, which is an antibacterial agent containing a pyridine compound as a main component. Examples of pyridine compounds include 2-pyridylthiol-1-oxide zinc, 2-chloro-4-trichloromethyl-6-(2-furylmethoxy)pyridine, 2-chloro-4-trichloromethyl-6-methoxypyridine, 2-chloro-6-trichloromethylpyridine, di(4-chlorophenyl)pyridylmethanol, 2,3,5,-trichloro-4-(n-propylsulfonyl)pyridine, 2-pyrindinethiol-1-oxide sodium, 1,4-(1-diiodomethylsulfonyl)benzene, 10,10'-oxybisphenoxyarsine, 6-(2-thiophenecarbonyl)-1H-2-benzimidazolecarbamic acid methyl ester, and 5-chloro-2-methyl-4-isothiazolin-3-one. These pyridine-based fungicides may be used alone or in combination of two or more. Among these pyridine-based antifungal agents, 2-pyridylthiol-1-zinc oxide is preferred from the viewpoint of realizing antifungal properties excellent in resistance to moist heat.

[0035] In the membrane material of the present invention, the total mass of the antifungal agent (g / m 2 ) is not particularly limited as long as it satisfies the antifungal properties described below, but may be, for example, 0.5 to 3.0 g / m 2 From the viewpoint of achieving a better balance between sound absorption, antifungal, antifouling, and non-combustibility of the membrane material, the total mass of the antifungal agent (g / m 2 ) is preferably 1.0 to 3.0 g / m 2 , more preferably 1.5 to 2.5 g / m 2 In the present invention, the "total mass of antifungal agent" refers to the total mass of the antifungal agent contained in the resin coating the glass fiber, and for example, when two or more resin layers are provided as the resin coating the glass fiber as described below, it refers to the total mass of the antifungal agent contained in all the resin layers.

[0036] In addition, in the membrane material of the present invention, the total mass of the resin (g / m 2 ) relative to the total mass of the fungicide (g / m 2 The ratio (antifungal agent / resin) is, for example, 0.010 to 0.100. From the viewpoint of achieving an even better balance between sound absorption, antifungal properties, antifouling properties, and nonflammability of the film material, the ratio (antifungal agent / resin) is preferably 0.030 to 0.070, and more preferably 0.040 to 0.060.

[0037] <Other ingredients> The film material of the present invention may contain other components in addition to the antifungal agent in the resin, such as additives including a crosslinking agent, a coloring pigment such as an organic pigment or an inorganic pigment, a dye, an ultraviolet absorber, and an infrared absorber.

[0038] <Membrane material structure> The membrane material of the present invention has a structure in which the glass fibers constituting the glass fiber fabric are covered with a resin containing a fungicide. In addition, in order to provide the membrane material of the present invention with breathability and excellent sound absorption properties as described below, at least a part of the gap formed by adjacent warp yarns and adjacent weft yarns in the glass fiber fabric is not completely covered with the resin, and an opening (vent) is formed.

[0039] <Layer structure of resin coating glass fiber> In the membrane material of the present invention, the resin coating the glass fiber may form a single resin layer, or may form two or more resin layers (preferably a two-layer structure or a three-layer structure) using resin compositions having different compositions.

[0040] In the film material of the present invention, when the resin coating the glass fiber forms two or more resin layers, it is sufficient that at least one of the resin layers contains an antifungal agent, but it is preferable that at least the resin layer arranged on the outermost surface of the film material contains an antifungal agent. In particular, when the resin coating the glass fiber forms two or more resin layers, it is preferable that the content ratio of the antifungal agent in the resin layer arranged on the outermost surface of the film material is higher than the average content ratio of the antifungal agent in the other resin layers. That is, in the film material of the present invention, the resin coating the glass fiber has a portion in which the content ratio of the antifungal agent differs in the thickness direction of the resin, and the content ratio is preferably highest on the surface side of the resin. By adopting such a configuration, it is possible to preferably provide the antifungal properties described below and to fully provide the antifungal performance required when installed as a membrane ceiling of an indoor pool.

[0041] In the membrane material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the constituent resin of the resin layer arranged on the outermost surface (the surface opposite to the glass fiber) may be any of the resins exemplified above, but preferably contains a polyurethane-based resin. By forming the resin layer arranged on the outermost surface with a polyurethane-based resin, the bonding property and antifouling property of the membrane material can be further improved.

[0042] In the membrane material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the content ratio of the antifungal agent in the resin layer disposed on the outermost surface (mass of antifungal agent contained in the resin layer disposed on the outermost surface / mass of resin contained in the resin layer disposed on the outermost surface) is preferably 0.060 to 0.30, more preferably 0.080 to 0.30, and even more preferably 0.100 to 0.250.

[0043] In the membrane material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the ratio of the mass of the resin contained in the resin layer arranged on the outermost surface to the mass of the glass fiber fabric (mass of the resin contained in the resin layer arranged on the outermost surface / mass of the glass fiber fabric) is, for example, 0.005 to 0.04, and preferably 0.01 to 0.03.

[0044] In addition, in the film material of the present invention, when the resin covering the glass fiber forms two or more resin layers, the constituent resin of the resin layer arranged other than the outermost surface may be the resin exemplified above, but preferably contains a polyurethane resin, and more preferably contains a polyurethane resin and an ethylene-vinyl acetate copolymer and / or a vinyl chloride-(meth)acrylic acid ester copolymer. In this way, at least one layer of the resin layer arranged other than the outermost surface is formed of a resin layer containing a polyurethane resin and an ethylene-vinyl acetate copolymer and / or a vinyl chloride-(meth)acrylic acid ester copolymer, thereby improving the water repellency of the film material and making it more excellent in antifungal properties, while the film material has excellent flexibility, making it easier to prevent wrinkles from occurring during construction of the membrane ceiling.

[0045] In the film material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the average content ratio of the antifungal agent in the resin layers arranged other than the outermost surface (total mass of the antifungal agent contained in all the resin layers arranged other than the outermost surface / total mass of the resin contained in all the resin layers arranged other than the outermost surface) is, for example, 0 to 0.05, preferably 0.01 to 0.04, and more preferably 0.02 to 0.04. Here, the average content ratio is the ratio of the mass of the resin contained in the resin layer to the mass of the antifungal agent contained in the resin layer when there is one resin layer arranged other than the outermost surface. In addition, when there are two or more resin layers arranged other than the outermost surface, the average content ratio is the ratio of the total mass of the resin contained in all the resin layers arranged other than the outermost surface (two or more resin layers) to the total mass of the antifungal agent contained in all the resin layers arranged other than the outermost surface (two or more resin layers).

[0046] In the membrane material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the ratio of the mass of the resin contained in the resin layers arranged on the other than the outermost surface to the mass of the glass fiber fabric (total mass of the resins contained in the resin layers arranged on the other than the outermost surface / mass of the glass fiber fabric) is, for example, 0.05 to 0.15, preferably 0.05 to 0.12. Here, when there is one resin layer arranged on the other than the outermost surface, the ratio is the mass ratio of the glass fiber fabric to the mass of the resin contained in the resin layer. When there are two or more resin layers arranged on the other than the outermost surface, the ratio is the mass ratio of the glass fiber fabric to the total mass of the resin contained in all of the resin layers arranged on the other than the outermost surface (two or more resin layers).

[0047] Furthermore, in the film material of the present invention, when the resin coating the glass fiber forms two or more resin layers, the content ratio of the antifungal agent in the resin layer arranged on the outermost surface (mass of antifungal agent contained in the resin layer arranged on the outermost surface / mass of resin contained in the resin layer arranged on the outermost surface) is preferably 3 to 10 times higher, and more preferably 5 to 10 times higher, than the content ratio of the antifungal agent in the other resin layers (total mass of antifungal agent contained in all resin layers arranged other than the outermost surface / total mass of resin contained in all resin layers arranged other than the outermost surface).

[0048] <Characteristics of membrane materials> (1) Breathability The membrane material of the present invention has a breathability of 1 to 40 cm 3 / cm 2 By setting the air permeability in this range, the sound absorption of the membrane material can be excellent. As mentioned above, if the amount of resin and the amount of antifungal agent are increased simply to improve the stain resistance and antifungal properties, the gaps formed by adjacent warp yarns and adjacent weft yarns that constitute the glass fiber fabric will be filled, and the air permeability will be reduced to 1 cm. 3 / cm 2If the amount of resin is reduced or the weaving density of the glass fiber fabric is reduced too much, the air permeability will be reduced to 40 cm 3 / cm 2 If the air permeability exceeds 3 to 20 cm / sec, the resulting membrane material will have poor sound absorption properties. 3 / cm 2 / sec is more preferable, 6-15cm 3 / cm 2 / sec is more preferable, 8-15cm 3 / cm 2 The air permeability is a value measured and calculated according to the method described in "7.13 Air permeability of cloth" of the Japanese Industrial Standard JIS R 3420:2013 "General test method for glass fibers."

[0049] In order to set the air permeability of the membrane material within the above range, the mass of the resin used, the weaving density of the glass fiber fabric, the count of the glass fibers, etc. may be appropriately adjusted.

[0050] (2) Mildew resistance The membrane material of the present invention is one in which no mycelium growth is observed even after 4 weeks of culture in a mold resistance test measured according to the wet method described in "7. Testing of Textile Products" of the Japanese Industrial Standard JIS Z 2911-2010 "Mold Resistance Test Method". As described above, the membrane material of the present invention contains an antifungal agent on the surface side of the resin, so that even if the membrane material is a membrane material with excellent sound absorption properties as the above-mentioned breathability, it can ensure high mold resistance required when installed as a membrane ceiling of an indoor pool, while also being excellent in dirt resistance.

[0051] In order to provide the above-mentioned antifungal properties, it is sufficient to include an antifungal agent on the surface side of the resin. However, the type and mass (g / m) of the antifungal agent may vary. 2 ) can be more easily achieved by appropriately adjusting the composition of the resin (mass, type, etc.).

[0052] (3) Nonflammable From the viewpoint of providing excellent non-combustibility, the membrane material of the present invention preferably satisfies the following requirements. <Requirements> According to "4.10.2 Box Test Method" of the "Fire Resistance Testing and Evaluation Procedure Manual" (revised on March 1, 2014) of the General Incorporated Foundation Building Materials Testing Center (a Japanese corporation), a radiant electric heater is used to apply 50 kW / m to the surface of the membrane material. 2 In the heat generation test, the maximum heat generation rate is 200 kW / m for 10 seconds or more continuously for 20 minutes after the start of heating. 2 and the total heat generation amount for 20 minutes after the start of heating is 8MJ / m 2 In the heat generation test, it is preferable that no through holes of 0.5 mm square or more are present for 20 minutes after the start of heating.

[0053] In order to provide the membrane material of the present invention with the above-mentioned requirement of non-combustibility, for example, the amount of resin may be adjusted or a flame retardant may be added to the resin.

[0054] (4) Sound absorption Furthermore, in order to obtain superior sound absorption properties when used in a membrane ceiling, the membrane material of the present invention preferably has an NRC (Noise Reduction Coefficient) value measured according to a method conforming to Japanese Industrial Standard JIS A 1409:1998 "Method of measuring sound absorption coefficient in a reverberation room" of 0.5 or more, and more preferably 0.6 to 0.9.

[0055] The specific method for measuring the NRC value is as follows. In accordance with the Japanese Industrial Standard JIS A 1409:1998 "Method for measuring reverberation room sound absorption coefficient", the reverberation room sound absorption coefficient is measured at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. The reverberation room sound absorption coefficient is measured in an irregular heptahedral reverberation room (room volume 264 m) with six microphones and two sound sources. 3 , total indoor surface area 247m 2 The reverberation room sound absorption coefficient is measured using a reverberation room sound absorption coefficient measuring device and white noise as the measurement noise. The membrane material to be measured is 3000 mm × 3640 mm (sample area 10.92 m 2) and install it in a reverberation chamber with a back air space thickness of 300 mm using the Type E-300 method described in Appendix D (Regulation) "Method of mounting specimens for sound absorption coefficient tests" of the Japanese Industrial Standard JIS A 1409:1998 "Method of measurement of sound absorption coefficient in a reverberation chamber". In this state, the reverberation chamber sound absorption coefficient is measured at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz under conditions of a temperature of 24.7°C and a relative humidity of 59.6%. In addition, when calculating the reverberation chamber sound absorption coefficient, correction is made for the temperature and humidity conditions of the air using formula (6) described in Appendix E (Reference) "Method of correction for the effect of changes in temperature and relative humidity in a reverberation chamber on the reverberation time" of the Japanese Industrial Standard JIS A 1409:1998 "Method of measurement of sound absorption coefficient in a reverberation chamber". The average of the reverberation room sound absorption coefficients at 250Hz, 500Hz, 1000Hz, and 2000Hz is taken as the NRC value.

[0056] In order to provide the membrane material of the present invention with the above-mentioned NRC value, for example, the air permeability may be adjusted, but it is also possible to more easily provide the membrane material with the above-mentioned NRC value by adjusting the cover factor of the glass fiber fabric and the amount of resin attached to the surface of the constituent glass fibers.

[0057] (5) Other physical properties The ignition loss of the membrane material of the present invention is not particularly limited, but from the viewpoint of making it easier to simultaneously achieve sound absorption, antifouling, nonflammability, and bonding between two woven fabrics to be bonded to a large area when the membrane material is used for a membrane ceiling, it is preferably 5 to 20 mass%, more preferably 8 to 17 mass%, and even more preferably 8 to 13 mass%. The ignition loss is a value measured according to the method described in "7.3.2 Ignition loss" of the Japanese Industrial Standard JIS R 3420:2013 "General test method for glass fibers".

[0058] The thickness of the membrane material of the present invention is not particularly limited, but is, for example, 0.2 to 0.8 mm, preferably 0.3 to 0.8 mm, and more preferably 0.3 to 0.7 mm. The mass (g / m 2 ) is not particularly limited, but may be, for example, 100 to 1000 g / m 2 , 200~600g / m 2is preferable, and 300 to 450 g / m 2 is more preferred.

[0059] <Method of manufacturing the membrane material of the present invention> The method for producing the membrane material of the present invention is not particularly limited as long as it can produce a membrane material having the above-mentioned configuration, but a suitable example is a method in which the following steps (1) to (3) are carried out in this order. By adopting such a method, the membrane material of the present invention can be easily produced, and a membrane material with excellent antifouling properties can be obtained while ensuring the resin mass necessary for antifouling properties and providing excellent antifouling properties, and also excellent antifungal properties. (1) A step of preparing a glass fiber fabric. (2) A first resin application step in which a resin is applied to the surface of the glass fibers constituting the glass fiber fabric to obtain an intermediate membrane material. (3) A second resin adhering step of adhering a resin having a higher content of antifungal agent than the resin adhered in the first resin adhering step to the membrane material intermediate.

[0060] (1) Preparation process of glass fiber fabric In this step, the above-mentioned glass fiber fabric is prepared. The glass fiber fabric may be prepared by weaving glass fibers, or may be obtained as a commercially available product.

[0061] (2) First resin attachment process In the first resin application step, a resin is applied to the surfaces of the glass fibers that make up the glass fiber fabric, to produce a membrane material intermediate in which the surfaces of the glass fibers are covered with a resin layer arranged on all surfaces except the outermost surface.

[0062] As described above, the resin used in the first resin adhesion step may be any resin capable of forming a resin layer disposed on any surface other than the outermost surface, and may have a lower content of antifungal agent than the resin used in the second resin adhesion step described below.

[0063] In the first resin adhesion step, examples of the method for adhering the resin include a method in which a resin composition solution of a desired composition is prepared, impregnated into a glass fiber fabric, the amount of adhesion is adjusted using a nip roll or a knife, etc., and then dried.

[0064] Furthermore, when forming three or more resin layers as the resin coating the glass fiber, the first resin adhesion step may be performed two or more times using the same or different resin composition solutions to adhere the resin to the surface of the glass fiber.

[0065] (3) Second resin attachment process In the second resin adhesion process, a resin having a higher content of antifungal agent than the resin adhered in the first resin adhesion process is adhered to the membrane material intermediate obtained in the first resin adhesion process, thereby obtaining the membrane material of the present invention.

[0066] As described above, the resin used in the second resin adhesion step may be any resin capable of forming a resin layer disposed on the outermost surface, and may have a higher content of antifungal agent than the resin adhered in the first resin adhesion step.

[0067] In the second resin adhesion step, examples of the method for adhering the resin include a method in which a resin composition solution of a desired composition is prepared, impregnated into the membrane material intermediate obtained in the first resin adhesion step, and the amount of adhesion is adjusted using a nip roll, a knife, or the like, and then dried.

[0068] <Membrane material applications> The membrane material of the present invention has excellent sound absorption, antifungal, and antifouling properties, and is used as a membrane ceiling. A membrane ceiling is a ceiling material installed on the ceiling of a building. The type of ceiling membrane on which the membrane material of the present invention is installed is not particularly limited, but examples thereof include ceiling membranes for indoor pools, indoor stadiums, gymnasiums, shopping malls, ceremonial halls, station lobbies, airport lobbies, etc. EXAMPLES

[0069] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the examples.

[0070] [Evaluation method] 1. Warp and weft count (tex) Measurements were made and calculations were made according to the method described in "7.1 Count" of the Japanese Industrial Standard JIS R 3420 2013 "General Test Methods for Glass Fibers."

[0071] 2. Single fiber diameter (μm) of the glass fibers that make up the warp and weft Twenty warp and weft yarns were randomly selected, and the diameters (largest part) of all the single fibers of the 20 yarns were measured and the average value was calculated to obtain the single fiber diameter.

[0072] 3. Warp and weft density (threads / 25mm) The weave density of the warp and weft yarns was measured and calculated according to the method described in "7.9 Density (weave density)" of the Japanese Industrial Standard JIS R 3420 2013 "General test method for glass fibers."

[0073] 4. Thickness (mm) Measurements were taken and calculated according to the method A described in "7.10.1 Cloth thickness" of the Japanese Industrial Standard JIS R 3420 2013 "General test methods for glass fibers."

[0074] 5. Mass of glass fiber fabric, mass of membrane material (g / m 2 ) Measurements were taken and calculations were made according to the method described in "7.2 Mass (mass) of cloth and mat" of the Japanese Industrial Standard JIS R 3420 2013 "General test methods for glass fibers."

[0075] 6.Ignition loss (mass%) Measurements were taken and calculated according to the method described in "7.3.2 Ignition loss" of the Japanese Industrial Standard JIS R 3420:2013 "General test methods for glass fibers."

[0076] 7.Nonflammable According to "4.10.2 Box Test Method" of the "Fire Resistance Testing and Evaluation Procedure Manual" (revised on March 1, 2014) of the General Incorporated Foundation Building Materials Testing Center, a radiant electric heater is used to irradiate the surface of the membrane material with 50 kW / m 2 In the heat generation test, a sample that satisfied all of the following three requirements (I) to (III) was rated as A (pass), and a sample that did not satisfy even one of them was rated as B (fail). (I) The maximum heat generation rate is 200 kW / m for 10 seconds or more for 20 minutes after the start of heating. 2 not exceed. (II) The total heat generation rate for the first 20 minutes after the start of heating is 8 MJ / m 2 The following is the result. (III) There are no through holes measuring 0.5 mm square or larger for 20 minutes after the start of heating.

[0077] 8. Breathability (cm 3 / cm 2 / sec) Measurements were made and calculations were made according to the method described in "7.13 Air permeability of cloth" in the Japanese Industrial Standard JIS R 3420:2013 "General test methods for glass fibers."

[0078] 9. Sound absorption The NRC value was calculated according to the Japanese Industrial Standard JIS A 1409:1998 "Method of measurement of sound absorption coefficient in a reverberation room." The specific measurement method is as follows.

[0079] The sound absorption coefficient was measured in an irregular heptagonal reverberation chamber (volume 264 m) with six microphones and two sound sources. 3 , total indoor surface area 247m 2 The reverberation room sound absorption coefficient was measured using a reverberation room sound absorption coefficient measuring device (AERevSys Alphas-LAB, manufactured by Nihon Onkyo Engineering Co., Ltd.) and white noise as the measurement noise. The membrane material to be measured was 3000 mm × 3640 mm (sample area 10.92 m2). 2) and attached in a reverberation chamber with a back air space thickness of 300 mm using the method of Type E-300 described in Appendix D (Regulations) "Method of mounting specimens for sound absorption coefficient tests" of the Japanese Industrial Standard JIS A 1409:1998 "Method of measurement of sound absorption coefficient in a reverberation chamber". In this state, the reverberation chamber sound absorption coefficient was measured at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz under conditions of temperature 24.7°C and relative humidity 59.6%. In addition, the calculation of the reverberation chamber sound absorption coefficient was performed by using formula (6) described in Appendix E (Reference) "Method of correction for the effect of changes in temperature and relative humidity in a reverberation chamber on the reverberation time" of the Japanese Industrial Standard JIS A 1409:1998 "Method of measurement of sound absorption coefficient in a reverberation chamber". The average reverberation room sound absorption coefficient at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz was taken as the NRC value.

[0080] 10. Stain resistance According to the method described in the Japanese Industrial Standard JIS K 5600-5-4:1999 "General Test Methods for Paints - Part 5: Mechanical Properties of Coatings - Section 4 Scratch Hardness (Pencil Method)", a pencil scratch tester and a pencil with hardness HB (trade name Uni, manufactured by Mitsubishi Pencil Co., Ltd.) were used to draw a line of about 50 mm in length by moving the pencil back and forth 10 times at an angle of 45° on the film material under a load of 750 gf. Next, an eraser (trade name "High Polymer Eraser Ain", manufactured by Pentel Co., Ltd.) was used to rub the line 10 times in a perpendicular direction under a load of 500 g, and the pencil marks were evaluated as "A" if the pencil marks were not noticeable, and "B" if the pencil marks were noticeable.

[0081] 11. Mildew resistant Measurements were performed in accordance with the wet method described in the "7. Testing of Textile Products" section of the Japanese Industrial Standard JIS Z 2911-2010 "Mold Resistance Test Method." Specifically, a test piece of the membrane material cut to 5 cm length and 5 cm width was attached to the surface of a plate medium (agar 20 g / L, ammonium nitrate 3 g / L, potassium dihydrogen phosphate 1 g / L, magnesium nitrate heptahydrate 0.5 g / L, potassium chloride 0.25 g / L, iron (II) nitrate heptahydrate 0.002 g / L, purified water balance) prepared in a petri dish, and 1 mL of a mixed spore suspension of fungi (Aspergillus niger NBRC 105649, Penicillium citrinum NBRC 6352, Chaetomium globosum NBRC 6347, and Myrothecium verrucaria NBRC 6113) was evenly sprayed onto the surface of the test piece and the medium, and the petri dish was covered and placed in a place maintained at 26 ± 2 °C for 28 days. The mold growth on the test pieces was observed 7, 14, 21, and 28 days after the start of incubation.

[0082] [Manufacturing of membrane materials] Example 1 (1) Preparation process of glass fiber fabric First, a twisted yarn (product name ECDE75 1 / 2 3.8S) manufactured by Unitika Glass Fiber Ltd. was prepared as the warp and weft. The warp and weft were woven in a plain weave structure with a warp density of 31 threads / 25 mm and a weft density of 30 threads / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0% by mass, the cover factor was 2241, the thickness was 0.296 mm, and the mass was 346.5 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0083] The double-twisted yarn used as the warp and weft yarns was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns at 3.8 turns / 25 mm, each of which was a yarn twisted at 0.7 turns / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm), and the yarn count of the double-twisted yarn was 135 tex.

[0084] (2) First resin attachment process (2-1) First Time The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of adhesion was adjusted using a nip roll or the like, and the fabric was dried at a temperature of 150°C for 3 minutes to carry out the first resin adhesion step. In the membrane material intermediate obtained in the first resin adhesion step, the mass of the adhered resin composition (resin and antifungal agent) was 5.9 g / m 2 The content ratio of the antifungal agent (antifungal agent / resin) was 0.143. (Prescription) Polyurethane resin dispersion (solid content 30%): 64 parts by weight Ethylene-vinyl acetate copolymer dispersion (solid content 56%): 42 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 6.1 parts by weight Pure water: 743.6 parts by mass Total: 855.7 parts by mass

[0085] (2-2) Second Time The intermediate membrane material obtained in the first first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll or the like, and the membrane material was dried at a temperature of 150°C for 3 minutes to carry out the second first resin attachment step. In the second first resin attachment step, the mass of the attached resin was 22.6 g / m 2 The content ratio of the antifungal agent (antifungal agent / resin) was 0. The mass of the resin composition in the intermediate membrane material obtained through the first and second first resin attachment steps was 28.5 g / m 2 The average content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.027. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Pure water: 73.1 parts by mass Total: 173.1 parts by mass

[0086] (3) Second resin attachment process The membrane material intermediate obtained in the second first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll or the like, and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes. The mass of the resin composition attached in the second resin attachment step was 8.4 g / m. 2 The content ratio of the antifungal agent adhered in the second resin adhering step (antifungal agent mass / resin mass) was 0.140. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 4.2 parts by weight Pure water: 337.7 parts by mass Total: 441.9 parts by mass

[0087] The total mass of the resin in the obtained membrane material was 35.1 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2 ) ratio (total mass of resin / mass of glass fiber fabric) is 0.10; total mass of membrane material (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / total mass of membrane material) is 0.09; the total mass of antifungal agent is 1.8g / m 2 ; Total resin mass (g / m 2 ) and the total mass of the fungicide (g / m 2 ) ratio (antifungal agent / resin) is 0.050; the mass of the membrane material is 383.4 g / m 2 ; the thickness of the membrane material was 0.346 mm.

[0088] Example 2 (1) Preparation process of glass fiber fabric First, warp yarns and twisted yarns (product name ECDE75 1 / 2 3.8S) manufactured by Unitika Glass Fiber Ltd. were prepared as warp yarns and weft yarns. The warp yarns and weft yarns were woven in a plain weave structure with a warp density of 31 yarns / 25 mm and a weft density of 30 yarns / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0% by mass, the cover factor was 2241, the thickness was 0.296 mm, and the mass was 346.5 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0089] The double-twisted yarn used as the warp and weft yarns was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns at 3.8 turns / 25 mm, each of which was a yarn twisted at 0.7 turns / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm), and the yarn count of the double-twisted yarn was 135 tex.

[0090] (2) First resin attachment process (2-1) First Time The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of adhesion was adjusted using a nip roll, a knife, or the like, and the fabric was dried at a temperature of 150°C for 3 minutes to perform the first resin adhesion step. The mass of the resin composition (resin and antifungal agent) adhered in the first resin adhesion step was 5.9 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.143. (Prescription) Polyurethane resin dispersion (solid content 30%): 64 parts by weight Ethylene-vinyl acetate copolymer (solid content 56%): 42 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 6.1 parts by weight Pure water: 743.6 parts by mass Total: 855.7 parts by mass

[0091] (2-2) Second Time The intermediate membrane material obtained in the first first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll, knife, etc., and the second first resin attachment step was carried out by drying at a temperature of 150°C for 3 minutes. The mass of the resin attached in the second first resin attachment step was 27.3 g / m 2 The content ratio of the antifungal agent (antifungal agent mass / resin mass) was 0. The mass of the resin composition in the membrane material intermediate obtained through the first and second first resin attachment steps was 33.2 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.023. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Pure water: 40.9 parts by mass Total: 140.9 parts by mass

[0092] (3) Second resin attachment process The membrane material intermediate obtained in the second first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll, knife, etc., and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes in a second resin attachment step. The mass of the resin composition attached in the second resin attachment step was 10.4 g / m 2 The content ratio of the antifungal agent adhered in the second resin adhering step (antifungal agent mass / resin mass) was 0.203. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 6.1 parts by weight Pure water: 337.7 parts by mass Total: 441.9 parts by mass

[0093] The total mass of the resin in the membrane material is 41.1 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2 ) ratio (total mass of resin / mass of glass fiber fabric) is 0.12; total mass of membrane material (g / m 2 ) to the total mass of resin (g / m2 The ratio (total mass of resin / total mass of membrane material) is 0.11; the total mass of antifungal agent is 2.5g / m 2 ; Total resin mass (g / m 2 ) and the total mass of the fungicide (g / m 2 ) ratio (antifungal agent / resin) is 0.061; the mass of the membrane material is 390.1 g / m 2 , the thickness of the membrane material was 0.345 mm.

[0094] Example 3 (1) Preparation process of glass fiber fabric First, a twisted yarn manufactured by Unitika Glass Fiber Ltd. (product name: ECDE75 1 / 2 3.8S; single fiber diameter 6 μm, 135 tex) was prepared as the warp yarn, and a bulky processed yarn manufactured by Unitika Glass Fiber Ltd. (product name: TDE300; single fiber diameter 6 μm, 305 tex) was prepared as the weft yarn. The above warp and weft yarns were woven in a plain weave structure with a warp density of 31 yarns / 25 mm and a weft density of 18 yarns / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0% by mass, the cover factor was 2133, the thickness was 0.45 mm, and the mass was 390.0 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0095] The double-twisted yarn used as the warp yarn was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns at 3.8 turns / 25 mm, each of which was a yarn twisted at 0.7 turns / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm) with a first twist of 3.8 turns / 25 mm, and the yarn count of the double-twisted yarn was 135 tex.

[0096] The bulky textured yarn used as the weft is a bulky textured yarn obtained by processing a doubled and twisted yarn described below into a bulky yarn, and the yarn count of the bulky textured yarn is 305 tex. The doubled and twisted yarn is a doubled and twisted yarn obtained by twisting four first twisted yarns (yarns) in which a yarn twisted 0.7 times / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm) is additionally twisted 3.8 times / 25 mm, in the direction opposite to the twisting direction of the first twisted yarns.

[0097] (2) First resin attachment process The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of adhesion was adjusted using a nip roll, a knife, etc., and the fabric was dried at a temperature of 150°C for 3 minutes to carry out the first resin adhesion step. The mass of the resin composition (resin and antifungal agent) adhered in the first first resin adhesion step was 40 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.031. In this Example 3, the first resin adhesion step was carried out only once. (Prescription) Polyurethane resin dispersion (solid content 30%): 24 parts by weight Vinyl chloride-acrylic acid ester copolymer emulsion (solid content 40%): 218 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 2.9 parts by weight Pure water: 135 parts by mass Total: 232.3 parts by mass

[0098] (3) Second resin attachment process In the second resin attachment step, the membrane material intermediate obtained in the first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll, a knife, or the like, and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes. The mass of the resin composition attached in the second resin attachment step was 10 g / m 2 The content ratio of the antifungal agent adhered in the second resin adhering step (antifungal agent mass / resin mass) was 0.118. (Prescription) Polyurethane resin dispersion (solid content 30%): 28.3 parts by weight Antifungal agent (pyridine-based antifungal agent) (solid content 100%): 1 part by weight Pure water: 147 parts by mass Total: 176.3 parts by mass

[0099] The total mass of the resin in the membrane material is 47.8 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2 ) ratio (total mass of resin / mass of glass fiber fabric) is 0.12; total mass of membrane material (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / total mass of membrane material) is 0.11; the total mass of antifungal agent is 2.2 g / m 2 , total mass of resin (g / m 2 ) and the total mass of the fungicide (g / m 2 ) ratio (antifungal agent / resin) is 0.047; the mass of the membrane material is 440.0 g / m 2 , the thickness of the membrane material was 0.600 mm.

[0100] Comparative Example 1 (1) Preparation process of glass fiber fabric First, a twisted yarn (product name ECDE75 1 / 2 3.8S) manufactured by Unitika Glass Fiber Ltd. was prepared as the warp and weft. The warp and weft were woven in a plain weave structure with a warp density of 31 threads / 25 mm and a weft density of 30 threads / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0% by mass, the cover factor was 2241, the thickness was 0.296 mm, and the mass was 346.5 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0101] The double-twisted yarn used as the warp and weft yarns was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns, each of which was twisted 0.7 times / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm) with a first twist of 3.8 times / 25 mm, and the yarn count of the double-twisted yarn was 135 tex.

[0102] (2) First resin attachment process The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of adhesion was adjusted using a nip roll or the like, and the fabric was dried at a temperature of 150°C for 3 minutes to carry out the first resin adhesion step. The mass of the resin composition (resin and antifungal agent) adhered in the first resin adhesion step was 3.3 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.030. In this Comparative Example 1, the first resin adhesion step was carried out only once. (Prescription) Polyurethane resin dispersion (solid content 30%): 53 parts by weight Ethylene-vinyl acetate copolymer dispersion (solid content 56%): 60 parts by weight Antifungal agent (triazole-based antifungal agent) (solid content 50%): 3 parts by weight Pure water: 154.4 parts by mass Total: 270.4 parts by mass

[0103] (3) Second resin attachment process The membrane material intermediate obtained in the first resin adhesion step was impregnated with a resin composition solution having the following formula, the adhesion amount was adjusted using a nip roll or the like, and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes in the second resin adhesion step. The mass of the resin composition adhered in the second resin adhesion step was 18.5 g / m 2 The content ratio of the antifungal agent adhered in the second resin adhering step (antifungal agent mass / resin mass) was 0.033. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Antifungal agent (triazole-based antifungal agent) (solid content 50%): 2 parts by weight Pure water: 112.6 parts by mass Total: 214.6 parts by mass

[0104] The total mass of the resin in the membrane material is 21.1 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / mass of glass fiber fabric) is 0.06; the total mass of the membrane material (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / total mass of membrane material) is 0.06; the total mass of antifungal agent is 0.7g / m 2 ; Total resin mass (g / m 2 ) and the total mass of the fungicide (g / m 2 ) ratio (antifungal agent / resin) is 0.033; the mass of the membrane material is 368.3 g / m 2 ; the thickness of the membrane material was 0.340 mm.

[0105] Comparative Example 2 (1) Preparation process of glass fiber fabric First, a twisted yarn manufactured by Unitika Glass Fiber Ltd. (product name ECDE75 1 / 2 3.8S; single fiber diameter 6 μm, 135 tex) was prepared as the warp and weft. The above warp and weft were woven in a plain weave structure with a warp density of 31 threads / 25 mm and a weft density of 30 threads / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0 mass, the cover factor was 2241, the thickness was 0.296 mm, and the mass was 346.5 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0106] The double-twisted yarn used as the warp and weft yarns was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns at 3.8 turns / 25 mm, each of which was a yarn twisted at 0.7 turns / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm), and the yarn count of the double-twisted yarn was 135 tex.

[0107] (2) First resin attachment process The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of the resin composition was adjusted using a nip roll or the like, and the fabric was dried at a temperature of 150°C for 3 minutes to carry out the first resin application step. The mass of the resin applied in the first resin application step was 6.4 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.030. In this Comparative Example 2, the first resin adhesion step was carried out only once. (Prescription) Polyurethane resin dispersion (solid content 30%): 53 parts by weight Ethylene-vinyl acetate copolymer dispersion (solid content 56%): 60 parts by weight Antifungal agent (triazole-based antifungal agent) (solid content 50%): 3 parts by weight Pure water: 154.4 parts by mass Total: 270.4 parts by mass

[0108] (3) Second resin attachment process The membrane material intermediate obtained in the first resin adhesion step was impregnated with a resin composition solution having the following formula, the adhesion amount was adjusted using a nip roll or the like, and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes in a second resin adhesion step. The mass of the resin composition adhered in the second resin adhesion step was 21.0 g / m 2 The content ratio of the antifungal agent adhered in the second resin adhering step (antifungal agent mass / resin mass) was 0.067. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Antifungal agent (triazole-based antifungal agent) (solid content 50%): 4 parts by weight Pure water: 112.6 parts by mass Total: 216.6 parts by mass

[0109] The total mass of the resin in the membrane material is 25.9 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2The ratio (total mass of resin / mass of glass fiber fabric) is 0.07; the total mass of the membrane material (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / total mass of membrane material) is 0.07; the total mass of antifungal agent is 1.5g / m 2 ; Total resin mass (g / m 2 ) and the total mass of the fungicide (g / m 2 ) and the ratio (antifungal agent / resin) is 0.058, and the mass of the membrane material is 373.9g / m 2 , the thickness of the membrane material was 0.340 mm.

[0110] Comparative Example 3 (1) Preparation process of glass fiber fabric First, a twisted yarn manufactured by Unitika Glass Fiber Co., Ltd. (product name: ECDE75 1 / 2 3.8S) was prepared as the warp yarn, and a bulky processed yarn manufactured by Unitika Glass Fiber Co., Ltd. (product name: TDE300) was prepared as the weft yarn. The above warp and weft yarns were woven in a plain weave structure with a warp density of 31 yarns / 25 mm and a weft density of 18 yarns / 25 mm to obtain a glass fiber fabric. The ignition loss of the glass fiber fabric was 1.0% by mass, the cover factor was 2233, the thickness was 0.45 mm, and the mass was 390.0 g / m 2 Since no heat cleaning treatment was performed, the glass fiber fabric contained polyvinyl alcohol and starch as sizing agents.

[0111] The double-twisted yarn used as the warp yarn was a double-twisted yarn obtained by twisting two first twisted yarns (yarns) in the opposite direction to the twist direction of the yarns at 3.8 turns / 25 mm, each of which was a yarn twisted at 0.7 turns / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm) with a first twist of 3.8 turns / 25 mm, and the yarn count of the double-twisted yarn was 135 tex.

[0112] The bulky textured yarn used as the weft is a bulky textured yarn obtained by processing a doubled and twisted yarn described below into a bulky yarn, and the yarn count of the bulky textured yarn is 305 tex. The doubled and twisted yarn is a doubled and twisted yarn obtained by twisting four first twisted yarns (yarns) in which a yarn twisted 0.7 times / 25 mm in the Z direction (number of single fibers in one yarn: 800, diameter of single fiber: 6 μm) is additionally twisted 3.8 times / 25 mm, in the direction opposite to the twisting direction of the first twisted yarns.

[0113] (2) First resin attachment process The obtained glass fiber fabric was impregnated with a resin composition solution having the following formula, the amount of the resin composition was adjusted using a nip roll, a knife, or the like, and the fabric was dried at a temperature of 150°C for 3 minutes to carry out the first resin application step. The mass of the resin applied in the first resin application step was 40 g / m 2 The content ratio of the antifungal agent (mass of antifungal agent / mass of resin) was 0.062. In this Comparative Example 3, the first resin adhesion step was carried out only once. (Prescription) Polyurethane resin dispersion (solid content 30%): 46.7 parts by weight Vinyl chloride-acrylic acid ester copolymer emulsion (solid content 40%): 190 parts by weight Antifungal agent (pyridine-based antifungal agent) (100% solids): 5.6 parts by weight Pure water: 130 parts by mass Total: 372.3 parts by mass

[0114] (3) Second resin attachment process The membrane material intermediate obtained in the first resin attachment step was impregnated with a resin composition solution having the following formula, the amount of attachment was adjusted using a nip roll, knife, etc., and the membrane material was obtained by drying at a temperature of 150°C for 3 minutes in the second resin attachment step. The mass of the resin composition attached in the second resin attachment step was 10 g / m 2 The content ratio of the antifungal agent adhered in the second resin adhering step (mass of antifungal agent / mass of resin) was 0. (Prescription) Polyurethane resin dispersion (solid content 30%): 100 parts by weight Pure water: 400 parts by mass Total: 500 parts by mass

[0115] The total mass of the resin in the membrane material is 47.7 g / m 2 ; Mass of glass fiber fabric (g / m 2 ) to the total mass of resin (g / m 2 ) ratio (total mass of resin / mass of glass fiber fabric) is 0.12; total mass of membrane material (g / m 2 ) to the total mass of resin (g / m 2 The ratio (total mass of resin / total mass of membrane material) is 0.11; the total mass of antifungal agent is 2.3 g / m 2 ; Total resin mass (g / m 2 ) and the total mass of the fungicide (g / m 2 ) ratio (mold inhibitor / resin) is 0.049; the mass of the membrane material is 440.0 g / m 2 ;the membrane material thickness was 0.600 mm.

[0116] [Membrane material evaluation results] The evaluation results are shown in Tables 1 and 2.

[0117] [Table 1]

[0118] [Table 2]

[0119] As shown in Tables 1 and 2, the membrane materials of Examples 1 to 3 contain a glass fiber fabric, a resin that coats the glass fibers that make up the glass fiber fabric, and a fungicide contained in the resin, and have a breathability of 1 to 40 cm. 3 / cm 2 / sec and the total mass of the resin is 20-60g / m 2Furthermore, when measured according to the wet method described in the "7. Testing of Textile Products" column of the Japanese Industrial Standard JIS Z 2911-2010 "Mold Resistance Test Method", no growth of mycelium was observed after 4 weeks of culture. The membrane materials of Examples 1 to 3 have excellent sound absorption, antifungal, and antifouling properties, and fully meet the required performance required when installed as a membrane ceiling for an indoor pool, for example.

[0120] On the other hand, in Comparative Examples 1 to 3, when measured according to the wet method described in the column "7. Testing of textile products" of the Japanese Industrial Standard JIS Z 2911-2010 "Mold resistance test method," mold growth was observed within 1 / 3 of the sample area after 4 weeks of culture (mold growth was observed on the 14th day), indicating that the samples have poor mold prevention properties and cannot suppress mold growth when installed as a membrane ceiling for an indoor swimming pool.

Claims

1. A membrane material used as a membrane ceiling in a building, Glass fiber fabric; A resin that coats glass fibers constituting the glass fiber fabric; A fungicide contained in the resin, The membrane material has an air permeability of 1 to 40 cm 3 / cm 2 / sec, The total mass of the resin is 20 to 60 g / m 2 and The resin forms two or more resin layers, the content ratio of the antifungal agent in the resin layer disposed on the outermost surface of the film material is higher than the average content ratio of the antifungal agent in the other resin layers; A membrane material in which no mycelium growth is observed even after 4 weeks of incubation in a mold resistance test measured in accordance with the wet method described in the column "7. Testing of Textile Products" of the Japanese Industrial Standards JIS Z 2911-2010 "Mold Resistance Test Method."

2. 2. The membrane material according to claim 1, wherein the fungicide is a pyridine-based fungicide.

3. 3. The membrane material according to claim 1, wherein the resin comprises a polyurethane resin, and an ethylene-vinyl acetate copolymer and / or a vinyl chloride-(meth)acrylic acid ester copolymer.

4. A membrane ceiling comprising the membrane material according to any one of claims 1 to 3.

5. Use of the membrane material according to any one of claims 1 to 3 as a membrane ceiling.

6. A method for producing the membrane material according to any one of claims 1 to 3, comprising the following steps (1) to (3): (1) A step of preparing a glass fiber fabric. (2) A first resin application step of applying a resin to the surface of the glass fibers constituting the glass fiber fabric to obtain an intermediate membrane material. (3) A second resin adhering step of adhering a resin having a higher content of antifungal agent than the resin adhered in the first resin adhering step to the intermediate membrane material.

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