Noncombustible sheet, and smokeproof hanging wall including noncombustible sheet

Abstract

To provide a noncombustible sheet of a glass fabric and a resin, reducing adhesion of dust when used as a smokeproof hanging wall for a long time and the smokeproof hanging wall having the noncombustible sheet.SOLUTION: There is provided a noncombustible sheet containing a glass fiber fabric and a resin composition layer contained with a state to be impregnated into the glass fiber fabric, and having surface resistivity before and after a specific heat cycle test of the noncombustible sheet of 1×1011 Ω or less. Preferably it has an antistatic layer containing metal or metal oxide to be a surface layer when the noncombustible sheet is used.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a non-flammable sheet, and more particularly to a non-flammable sheet suitable for use in a hanging smoke barrier, and a hanging smoke barrier using the same. [Background technology]

[0002] The Building Standards Act and its Enforcement Order stipulate that smoke exhaust systems must be installed to prevent the flow of smoke, toxic gases, etc. that are generated in the event of a fire in a building, and to facilitate evacuation and firefighting activities. Therefore, office buildings, commercial facilities, and other buildings often have smoke exhaust systems and smoke barriers such as vertical smoke barriers installed.

[0003] Hanging smoke barriers are usually attached to the ceilings of buildings to temporarily block the flow of smoke, toxic gases, etc. into corridors or upper floors in the event of a fire, thereby ensuring the necessary time for evacuation. Therefore, to prevent the hanging smoke barriers from obstructing the view or spoiling the aesthetics, plate glass, resin composites of glass fiber and resin, etc. are used for the hanging smoke barriers. Resin composites of glass fiber and resin have the advantage of being less likely to break than plate glass. For example, Patent Document 1 discloses a transparent non-combustible sheet containing a glass fiber fabric and a cured resin layer.

[0004] Furthermore, for example, Patent Document 2 discloses a transparent non-combustible sheet having a base layer including a glass fiber cloth and a transparent cured resin layer impregnated therein, and having a reinforcing layer integrally formed on at least one side of the base layer.

[0005] Furthermore, for example, Patent Document 3 discloses a transparent noncombustible laminate having an adhesive-impregnated coated glass cloth as a substrate with soft vinyl chloride resin transparent layers provided on both sides thereof, wherein the adhesive-impregnated coated glass cloth is a composite intermediate formed by impregnating, coating, and curing an adhesive component containing a triisocyanate compound and a binder resin in a mass ratio of 1:5 to 1:35 on glass cloth treated with a silane coupling agent, and wherein the triisocyanate compound is one or more selected from the group consisting of isocyanurate-modified triisocyanate, biuret-modified triisocyanate, and trimethylol alkyl-modified triisocyanate. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-319746 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-213093 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-76563 Summary of the Invention [Problem to be solved by the invention]

[0007] As a result of investigations by the present inventors, it has been found that the nonflammable sheets described in Patent Documents 1 to 3 have a problem in that, when used for a long period of time as, for example, a hanging smoke barrier, dust present in the air inside a building in which the nonflammable sheet is installed adheres to the surface of the nonflammable sheet, deteriorating the appearance. Under these circumstances, the present invention aims to provide a nonflammable sheet made of glass cloth and resin that reduces the adhesion of dust when used for a long period of time as, for example, a hanging smoke barrier, and a hanging smoke barrier including the nonflammable sheet. [Means for solving the problem]

[0008] In order to solve the above problem, the present inventors have conducted research and found that the non-combustible sheets disclosed in Patent Documents 1 to 3 have a surface resistivity of 1×10 15 As a result of intensive research by the present inventors, it was found that the surface resistivity was about 1×10 Ω before and after a specific heat cycle test. 11 It was found that the adhesion of dust can be reduced by setting the resistance to Ω or less. The present invention was completed based on these findings and through further investigation.

[0009] That is, the present invention provides the following aspects. Item 1. A non-combustible sheet comprising a glass fiber cloth and a resin composition layer impregnated in the glass fiber cloth, wherein the non-combustible sheet has a surface resistivity of 1 × 10 or less before and after the following heat cycle test. 11 Non-flammable sheet with a resistance of Ω or less. <Heat cycle test conditions> The non-flammable sheet was cut into a size of 100 mm x 100 mm to prepare a sample, and the sample was placed in a thermo-hygrostat (manufactured by Espec Corporation, product name PSL-2KPH) that had been initially set to a temperature of 23°C and a relative humidity of 50% RH. A total of 10 cycles were performed, with the following steps (1) to (5) being considered as one cycle. (1) The temperature is changed from 23°C and 50% RH to 60°C and 50% RH in 14 minutes. (2) Maintain the temperature of 60°C and the relative humidity of 50% for 8 hours. (3) The temperature is changed from 60°C and 50% RH to 20°C and 50% RH over a period of 45 minutes. (4) Maintain the above temperature of 20°C and relative humidity of 50% RH for 8 hours. (5) The temperature and relative humidity are changed from 20°C and 50% RH to 23°C and 50% RH over a period of 1 minute. Item 2. The non-flammable sheet according to Item 1, further comprising an antistatic layer containing a metal or metal oxide that serves as a surface layer when the non-flammable sheet is in use. Item 3. The layer that becomes the surface layer when the non-combustible sheet is used contains a surfactant, and the mass (g / m ) of the surfactant in the non-combustible sheet 2 ) is 0.5 to 1.5 g / m 2 Item 1. The non-flammable sheet according to item 1. Item 4. The non-flammable sheet according to any one of Items 1 to 3, which has a total light transmittance of 90% or more and a haze of 20% or less. Item 5. The nonflammable sheet according to any one of Items 1 to 4, which is for use in a hanging smoke barrier. Item 6. A smoke-proof hanging wall comprising the nonflammable sheet according to any one of items 1 to 5. [Effects of the Invention]

[0010] According to the present invention, the surface resistivity is 1×10 11 By setting the resistance to Ω or less, it is possible to reduce adhesion of dust when used for a long period of time as a hanging smoke barrier, for example. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view showing an example of the noncombustible sheet of the present invention. [Figure 2] 1 is a schematic cross-sectional view showing an example of the noncombustible sheet of the present invention. [Figure 3] 1 is a schematic cross-sectional view showing an example of the noncombustible sheet of the present invention. [Figure 4] 1 is a schematic cross-sectional view showing an example of the noncombustible sheet of the present invention. [Figure 5] FIG. 2 is a schematic plan view illustrating a method for measuring initial tear strength according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The non-combustible sheet of the present invention is a non-combustible sheet comprising a glass fiber cloth and a resin composition layer impregnated in the glass fiber cloth, wherein the non-combustible sheet has a surface resistivity of 1×10 or less before and after the following heat cycle test. 11 It is characterized by being Ω or less. <Heat cycle test conditions> The non-flammable sheet was cut into a size of 100 mm x 100 mm to prepare a sample, and the sample was placed in a thermo-hygrostat (manufactured by Espec Corporation, product name PSL-2KPH) that had been initially set to a temperature of 23°C and a relative humidity of 50% RH. A total of 10 cycles were performed, with the following steps (1) to (5) being considered as one cycle. (1) The temperature is changed from 23°C and 50% RH relative humidity to 60°C and 50% RH relative humidity over a period of 14 minutes. (2) Maintain the temperature of 60°C and the relative humidity of 50% for 8 hours. (3) The temperature is changed from 60°C and 50% RH to 20°C and 50% RH over a period of 45 minutes. (4) Maintain the above temperature of 20°C and relative humidity of 50% RH for 8 hours. (5) The temperature and relative humidity are changed from 20°C and 50% RH to 23°C and 50% RH over a period of 1 minute.

[0013] 1 to 4, the noncombustible sheet 1 of the present invention has a laminated structure including a glass fiber cloth 2 and a resin composition layer 3 impregnated into the glass fiber cloth 2. The noncombustible sheet 1 may include at least one layer of the glass fiber cloth 2, or may include multiple layers.

[0014] 2 to 4, the noncombustible sheet 1 of the present invention can also have a laminated structure including a glass fiber cloth 2, a resin composition layer 3 impregnated in the glass fiber cloth 2, and a film layer 4 on at least one side, preferably both sides, of the resin composition layer 3. As shown in Fig. 3 and Fig. 4, the noncombustible sheet 1 of the present invention can include a peelable protective film 5 on at least one side, preferably both sides, of the resin composition layer 3 or the film layer 4, which is peeled off when used, for example, as a hanging smoke barrier.

[0015] 1 to 4, the resin composition layer 3 fills the gaps between the glass fibers constituting the glass fiber cloth 2, and one surface side portion 31 of the resin composition layer 3 communicates with the other surface side portion 32 through the gaps. In addition, in the noncombustible sheet 1 of the present invention, from the viewpoint of enhancing transparency, it is preferable that the resin composition layer 3 is formed on at least one surface of the layer of glass fiber cloth 2, as shown in, for example, FIGS. 1 to 4, and it is more preferable that the resin composition layer 3 is formed on both surfaces of the layer of glass fiber cloth 2.

[0016] As shown in FIG. 1, when the film layer 4 is not laminated, an antistatic layer 6 containing a metal or a metal compound can be provided on the surface side of the resin composition layer 3 (the side 31 and 32 in FIG. 1) or on the surface side of the film layer 4 (the side 41 and 42 in FIG. 2 and 3) when the film layer 4 is laminated as shown in FIGS. 2 and 3. This can further reduce the surface resistivity before and after a specific heat cycle test, further reduce the change in surface resistivity before and after a specific heat cycle test, and achieve better transparency. It is more preferable to arrange the antistatic layer 6 containing a metal or a metal compound so that it becomes the surface layer when the nonflammable sheet 1 is used, for example, as a hanging smoke barrier. The composition of each layer constituting the nonflammable sheet 1 of the present invention is described in detail below.

[0017] (glass fiber cloth 2) In the noncombustible sheet 1 of the present invention, the glass fiber cloth 2 is composed of a plurality of glass fibers. In the glass fiber cloth 2, the plurality of glass fibers are entangled with each other to form a single piece of cloth. An example of the glass fiber cloth 2 is a glass fiber fabric (glass cloth) composed of a plurality of warp threads and a plurality of weft threads. The weave of the glass fiber fabric is not particularly limited, and examples thereof include plain weave, satin weave, twill weave, basket weave, and rib weave.

[0018] The glass material of the glass fibers constituting the glass fiber cloth 2 is not particularly limited, and for example, known glass materials can be used. Examples of glass materials 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), and preferably the versatile alkali-free glass (E glass). The glass fibers constituting the glass fiber cloth 2 may be made of one type of glass material or a combination of two or more types of glass fibers made of different glass materials. Furthermore, from the viewpoint of improving transparency, it is preferable to select a glass material whose refractive index is close to that of the resin composition layer 3 described below.

[0019] The count of the glass fibers constituting the glass fiber cloth 2 is not particularly limited as long as it can form the glass fiber cloth 2. From the viewpoint of improving transparency, the count of the glass fibers is preferably 20 tex or less, more preferably 3 to 6 tex, and more preferably 3 to 5 tex. The count of the glass fibers may be one type alone or two or more types may be combined. The tex count of the glass fibers corresponds to the number of grams per 1000 m.

[0020] The glass fibers constituting the glass fiber cloth 2 are preferably glass yarns in which multiple long glass fiber monofilaments are twisted together. The number of monofilaments in the glass yarn is preferably about 30 to 400, more preferably about 40 to 120. The diameter of the monofilament in the glass yarn is preferably about 3.0 to 6.0 μm, more preferably about 3.0 to 5.0 μm, from the viewpoint of suppressing color bleeding of the noncombustible sheet 1. The count of the glass yarn is preferably 3 to 30 tex, more preferably 3 to 12 tex, and even more preferably 3 to 5 tex, from the viewpoint of suppressing color bleeding. The mechanism by which color bleeding of the noncombustible sheet 1 is suppressed by the diameter of the monofilament in the glass yarn constituting the glass fiber cloth 2 and the count of the glass yarn falling within the above ranges is not clear in detail, but it is believed that by satisfying these conditions, shrinkage at the interface between the glass yarn and the resin composition layer 3 is more effectively suppressed, and as a result, color bleeding of the noncombustible sheet 1 is suppressed.

[0021] In the non-combustible sheet 1, the proportion (mass %) of the glass fiber cloth 2 is preferably 20 to 50 mass %, more preferably 20 to 40 mass %, and even more preferably 20 to 30 mass %, of the total amount of the glass fiber cloth 2 and the resin composition layer 3 described below, from the viewpoint of suppressing color bleeding. 2 ) is 10 to 120 (g / m 2 ) is preferred, and 10 to 60 (g / m 2 ) is more preferable, and 10 to 40 (g / m 2 ) is more preferred.

[0022] The difference in refractive index between the glass fiber cloth 2 and the resin composition layer 3 described below is preferably 0.05 or less, more preferably 0.02 or less, and even more preferably 0.01 or less. The refractive index of the glass fiber cloth 2 is preferably about 1.45 to 1.65, and more preferably about 1.50 to 1.60.

[0023] The refractive index of the glass fiber cloth 2 is measured in accordance with the B method of JIS K 7142:2008. Specifically, the glass fibers constituting the glass fiber cloth 2 are immersed in methylene iodide (n D 23 1.747), butyl phthalate (n D 23 1.491) and dimethyl carbonate (n D 23 The refractive index of the resin composition 3 is measured at a temperature of 23°C using an Abbe refractometer (NAR-2T manufactured by Atago Co., Ltd.) with a wavelength of 589 nm and a sodium D line as a light source, and the average value of five tests is taken as the refractive index. The refractive index of the resin composition 3 is measured in accordance with the B method of JIS K 7142:2008. Specifically, the cured or solidified resin composition is powdered and immersed in methylene iodide (n D 23 1.747), butyl phthalate (n D 23 1.491) and dimethyl carbonate (n D 23 1.366), and a small measuring microscope STM5-311 (Olympus, observation magnification 400x) was used as the microscope, and measurements were taken at a temperature of 23°C using sodium D line with a wavelength of 589 nm as the light source, and the average value of 5 tests was taken as the refractive index value.

[0024] The difference in Abbe number between the glass fiber cloth 2 and the cured resin composition layer 3 is preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less. The Abbe number of the glass fiber cloth 2 is preferably 30 to 80, more preferably 40 to 70, and even more preferably 50 to 65. The Abbe numbers of the cured resin composition layer and the glass fiber cloth are measured as follows.

[0025] (Abbe number of cured resin composition layer) A sheet of the cured resin composition not containing glass fiber cloth was prepared under the same conditions and thickness as the case containing glass fiber cloth, and a test piece was cut to a width of 8 mm and a length of 20 mm. The surface was well polished, and the refractive index at a wavelength of 589 nm was measured in accordance with JIS K 7142A using an Abbe refractometer NAR-2T manufactured by Atago Co., Ltd., diiodomethane as the contact liquid, and sodium D line with a wavelength of 589 nm as the light source at a measurement temperature of 23° C. Next, the dispersion value was measured and calculated using natural light as the light source, and the Abbe number was calculated according to the following formula (I). Abbe number = (refractive index at wavelength 589 nm - 1) / dispersion value (I)

[0026] (Abbe number of glass fiber cloth) A glass sheet 8 mm wide, 20 mm long, and 5 mm thick was prepared using the glass material that constitutes the glass fiber, and the surface was thoroughly polished. The refractive index at a wavelength of 589 nm was measured in accordance with JIS K 7142A using an Abbe refractometer NAR-2T manufactured by Atago Co., Ltd., diiodomethane as the contact liquid, and sodium D line with a wavelength of 589 nm as the light source at a measurement temperature of 23° C. Next, the dispersion value was measured and calculated using natural light as the light source, and the Abbe number was calculated according to the above formula (I).

[0027] The thickness of the glass fiber cloth 2 is, for example, about 10 to 100 μm, and from the viewpoint of suppressing color bleeding, it is preferably 10 to 55 μm, and more preferably about 10 to 35 μm. When the thickness of the glass fiber cloth 2 is 10 to 35 μm, it is particularly preferable that the glass fiber cloth 2 has a glass volume fraction of 38% or more as calculated by the following formula (II). A glass fiber cloth 2 having a thickness of 10 to 35 μm and a glass volume fraction of 38% or more can be obtained, for example, by subjecting glass fibers to an opening treatment.

[0028] Glass volume (%) = (A / (B × C)) × 100 (II) A: Mass of glass fiber cloth (g / m 2 ) B: Specific gravity of the glass material that makes up the glass fiber cloth (g / m 3 ) C: Thickness of the glass fiber cloth (m)

[0029] (Resin composition layer 3) In the nonflammable sheet 1 of the present invention, the resin composition layer 3 is impregnated into the glass fiber cloth 2 and is formed by curing or solidifying a resin-containing resin composition. Specifically, the resin composition layer 3 can be a curable resin composition layer or a thermoplastic resin composition layer. When a cured resin composition layer is used, the resin composition containing a curable resin can be cured by applying energy such as light or heat to the resin composition (a photocured resin composition or a thermoset resin composition). When a thermoplastic resin composition layer is used, the thermoplastic resin composition can be a cured product obtained by drying and solidifying the thermoplastic resin composition.

[0030] The curable resin is preferably one that can approximate the refractive index of the resin composition layer 3 to that of the glass fiber cloth 2, from the viewpoint of further improving the transparency of the non-combustible sheet 1 before and after the specific heat cycle test described above. Preferred curable resins are those that produce photocurable curable resin compositions, such as vinyl ester resins, urethane acrylate resins, fluorene acrylate resins, unsaturated polyester resins, curable acrylic resins, and epoxy resins. Among these, curable acrylic resins are more preferred from the viewpoint of further improving adhesion to the film layer 4 when the film layer 4 is provided, and a cured resin composition containing acrylic syrup is particularly preferred. In the present invention, acrylic syrup refers to a polymerizable liquid mixture obtained by dissolving a (meth)acrylic ester polymer, such as polymethyl methacrylate (PMMA), in an acrylic monomer, such as methyl methacrylate. Among the above acrylic syrups, acrylic syrups obtained by dissolving one or more acrylic ester polymers selected from the group consisting of polymethyl methacrylate, methyl methacrylate / methyl acrylate copolymer, and methyl methacrylate / normal butyl acrylate copolymer in methyl methacrylate monomer are particularly preferred. In this way, when the cured resin composition layer 3 is obtained by curing a resin composition containing an acrylic syrup, adhesion to the film layer 4 is further improved, and therefore the transparency of the nonflammable sheet 1 before and after the specific heat cycle test described above is further improved, which is preferable.

[0031] From the viewpoint of further improving the transparency of the non-combustible sheet 1 before and after the specific heat cycle test described above, the thermoplastic resin is preferably one that can approximate the refractive index of the resin composition layer 3 and the glass fiber cloth 2. Examples of preferred thermoplastic resins include polyvinyl chloride resins, saturated polyester resins, polyolefin resins, thermoplastic acrylic resins, polycarbonate resins, polyvinyl alcohol resins, ethylene-vinyl acetate copolymers, polyamide resins, and polyarylate resins. For example, when E-glass is used as the glass material for the glass fibers constituting the glass fiber cloth 2, polyvinyl chloride resins, saturated polyester resins, and thermoplastic acrylic resins are preferred from the viewpoint of refractive index. One type of thermoplastic resin may be used alone, or two or more types with different refractive indices may be used in combination to approximate the refractive index of the glass fiber used. In the non-combustible sheet 1 of the present invention, when the resin composition layer 3 is a thermoplastic resin composition layer, the portion impregnated into the glass fiber cloth 2 is preferably impregnated with a thermoplastic resin composition in a sol state or dissolved in a solvent, and solidified (by heating or drying). Furthermore, the portion of the resin composition layer 3 that is not impregnated with the glass fiber cloth 2 may be impregnated with a thermoplastic resin composition in a sol state or dissolved in a solvent and solidified (solidified by heating or solidified by drying), or may be formed from a film-like thermoplastic resin composition.

[0032] In addition, when it is necessary to join non-combustible sheets, for example, when making them into a tension-type hanging smoke barrier as described below, and when the ends of the non-combustible sheets are joined by high-frequency welding, it is preferable that the resin composition layer 3 in which the glass fiber cloth 2 is impregnated is a cured resin composition layer, since this makes it easier to maintain the transparency of the ends of the non-combustible sheets that are subjected to high-frequency welding before and after the welding process.

[0033] The resin composition forming the resin composition layer 3 may further contain additives such as a curing accelerator, a flame retardant, an ultraviolet absorber, a filler, and a photopolymerization initiator. Examples of flame retardants include aluminum hydroxide, magnesium hydroxide, trichloroethyl phosphate, triallyl phosphate, ammonium polyphosphate, and phosphoric acid ester. Examples of ultraviolet absorbers include benzotriazole. Examples of fillers include calcium carbonate, silica, and talc. Photopolymerization initiators include 2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]phenyl}-2-methyl-propan-1-one, 2-methyl Examples of the additives include 2-benzyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1,2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide. Among these, when a curable acrylic resin is used as the curable resin constituting the resin composition layer 3, 1-hydroxy-cyclohexyl-phenyl-ketone is preferred from the viewpoint of improving transparency. These additives may be used alone or in combination of two or more.

[0034] In the nonflammable sheet 1 of the present invention, when the film layer 4 is not laminated, as in the embodiment illustrated in Fig. 1, the resin composition layer 3 can contain a surfactant in order to reduce dust adhesion when the sheet is used for a long period of time, for example, as a hanging smoke barrier. That is, when using a surfactant to achieve the effect of the present invention, for example, reducing dust adhesion when the sheet is used for a long period of time as a hanging smoke barrier, the surfactant can be contained in the layer that will become the surface layer when the sheet is used. In other words, when using a surfactant to achieve the effect of the present invention, for example, reducing dust adhesion when the sheet is used for a long period of time as a hanging smoke barrier, the surfactant needs to be contained in the layer that will become the surface layer when the sheet is used.

[0035] In the present invention, surfactants include cationic surfactants, anionic surfactants, nonionic (nonionic) surfactants, amphoteric surfactants, fluorine-based surfactants, and reactive surfactants.For example, anionic surfactants include sulfate salts of higher alcohols, higher alkyl sulfonic acids and their salts, alkylbenzene sulfonic acids and their salts, polyoxyethylene alkyl sulfate salts, polyoxyethylene alkylphenyl ether sulfate salts, vinyl sulfosuccinate, and polyoxyalkylene alkyl ether sulfate salts.For nonionic surfactants, include polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyethylene glycol fatty acid esters, ethylene oxide-propylene oxide block copolymers, polyoxyethylene fatty acid amides, ethylene oxide-propylene oxide copolymers, and sorbitan derivatives such as polyoxyethylene sorbitan fatty acid esters.For amphoteric surfactants, include lauryl betaine and lauryl dimethylamine oxide. Examples of reactive surfactants include compounds having a reactive double bond, such as alkylpropenylphenol polyethylene oxide adducts and their sulfate ester salts, allylalkylphenol polyethylene oxide adducts and their sulfate ester salts, and allyldialkylphenol polyethylene oxide adducts and their sulfate ester salts. Among these, polyoxyalkylene alkyl ether sulfates are preferred from the viewpoint of achieving a better balance between transparency and antistatic properties of the nonflammable sheet.

[0036] On the other hand, in the noncombustible sheet 1 of the present invention, if the resin composition layer 3 or the film layer 4 described below contains an excessive amount of surfactant, the transparency of the noncombustible sheet 1 may be impaired. This is because surfactants generally have poor compatibility with resins. Therefore, from the viewpoint of obtaining excellent transparency while ensuring the function of reducing dust adhesion when used for a long period of time as a hanging smoke barrier, for example, the content of the surfactant in the resin composition layer 3 or film layer 4 that will become the surface layer in use is 0.5 to 2.0 mass%, preferably 0.5 to 1.5 mass%, more preferably 0.5 to 1.0 mass%, and even more preferably 0.5 to 0.75 mass%. Furthermore, from the same viewpoint as above, the mass (g / m) of the surfactant contained in the layer that will become the surface layer in use is 2 ) is 0.5 to 2.0 g / m in non-combustible sheets 2 and 0.5 to 1.5 g / m 2 is preferable, and 0.5 to 1.0 g / m 2 More preferably, 0.5 to 0.75 g / m 2 is more preferable.

[0037] As will be described later, in the non-combustible sheet of the present invention, in order to reduce adhesion of dust when used for a long period of time as, for example, a smoke barrier, the surface resistivity is set to 1×10 before and after a specific heat cycle test. 11 The surface resistivity must be Ω or less. This surface resistivity can be achieved by, for example, incorporating only a surfactant into the resin composition layer 3 when the film layer 4 is not laminated, or into the film layer 4 when the film layer 4 is laminated, as described above.

[0038] On the other hand, the upper limit of surface resistivity (1 × 10 11From the viewpoint of further reducing the change in surface resistivity before and after a specific heat cycle test and obtaining better transparency while further lowering the resistivity (Ω), it is preferable to provide an antistatic layer 6 containing a metal or a metal compound, which will be described later, on the surface side of the resin composition layer 3 when the film layer 4 is not laminated, or on the surface side of the film layer 4 when the film layer 4 is laminated, as shown in FIG. 4 , rather than incorporating a surfactant in the resin composition layer 3 or film layer 4 that will become the surface layer when used as, for example, a hanging smoke barrier, and it is more preferable to provide an antistatic layer 6 containing metal fine particles or metal compound fine particles. The reasons for this, according to the investigations of the present inventors, are as follows: first, when the resin composition layer 3 when the film layer 4 is not laminated, or the film layer 4 when the film layer 4 is laminated, contains only a surfactant, the surface resistivity before and after a specific heat cycle test is 1×10 10It was found that it is not possible to achieve both high performance, such as a resistance of Ω or less, and high transparency, such as a total light transmittance of 90% or more and a haze of 20% or less. On the other hand, it was found that in an embodiment in which an antistatic layer 6 containing a metal or a metal compound is provided on the surface side of the resin composition layer 3 when the film layer 4 is not laminated, or on the surface side of the film layer 4 when the film layer 4 is laminated, both of the above-mentioned performances can be achieved. Second, it was found that in an embodiment in which only a surfactant is contained in the resin composition layer 3 when the film layer 4 is not laminated, or in the film layer 4 when the film layer 4 is laminated, the surfactant may bleed out during a specific heat cycle test, making it easier for the surface resistivity to change before and after the specific heat cycle test. On the other hand, it was found that in an embodiment in which an antistatic layer 6 containing a metal or a metal compound is provided on the surface side of the resin composition layer 3 when the film layer 4 is not laminated, or on the surface side of the film layer 4 when the film layer 4 is laminated, there is no risk of bleed-out, and therefore the change in surface resistivity before and after the specific heat cycle test can be further reduced. In addition, thirdly, it was found that in embodiments in which the resin composition layer 3 contains only a surfactant when the film layer 4 is not laminated, or in which the film layer 4 contains only a surfactant when the film layer 4 is laminated, bleed-out of the surfactant may cause stickiness on the surface of the nonflammable sheet 1, for example, when used as a hanging smoke barrier. When this stickiness occurs, dust may be difficult to remove once it has adhered. On the other hand, if an antistatic layer 6 containing a metal or metal compound is provided on the surface side of the resin composition layer 3 when the film layer 4 is not laminated, or on the surface side of the film layer 4 when the film layer 4 is laminated, the occurrence of stickiness can be further reduced.

[0039] Therefore, as shown in FIG. 1 , for example, in the case where the noncombustible sheet 1 of the present invention is not laminated with the film layer 4, it is preferable to provide an antistatic layer 6 containing a metal or a metal compound on the surface side of the resin composition layer 3, from the viewpoints of further reducing the surface resistivity before and after a specific heat cycle test, further reducing the change in the surface resistivity before and after a specific heat cycle test, and obtaining better transparency. In this case, the resin composition layer 3 is formed of a material having a thickness of 100 μm or less, and the total mass (g / m ) of the resin composition layer 3 excluding the glass fiber cloth 2 is 100 μm or less. 2 ) of the surfactant contained in the resin composition layer 3 relative to the mass (g / m 2 ) is preferably 1% by mass or less, more preferably 0.3% by mass or less, even more preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, and even more preferably 0% by mass. Furthermore, in the case where the nonflammable sheet 1 of the present invention is provided with a film layer 4 as shown in Figs. 2 and 3, for example, and the film layer 4 contains a surfactant to reduce adhesion of dust when used as a hanging smoke barrier for a long period of time, the total mass (g / m) of the resin composition layer 3 excluding the glass fiber cloth 2 is 2 ) relative to the mass (g / m) of the surfactant contained in the resin composition layer. 2 ) is preferably 1% by mass or less, more preferably 0.3% by mass or less, even more preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, and even more preferably 0% by mass. In addition, even when the noncombustible sheet 1 of the present invention is provided with a film layer 4 as shown in FIG. 4 and an antistatic layer 6 containing a metal or a metal compound on the surface side of the resin composition layer 3, the total mass (g / m 2 ) of the surfactant contained in the resin composition layer 3 relative to the mass (g / m 2 ) is preferably 1% by mass or less, more preferably 0.3% by mass or less, even more preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, and even more preferably 0% by mass.

[0040] In the noncombustible sheet 1 of the present invention, the mass of the resin composition layer 3 is, for example, 20 to 400 g / m 2From the viewpoint of achieving a better balance between transparency and non-flammability before and after the specific heat cycle test described above, a range of 20 to 250 g / m 2 is preferably 20 to 100 g / m 2 The thickness of the resin composition layer 3 is, for example, 20 to 500 μm, and from the viewpoint of achieving a better balance between transparency and non-flammability before and after the specific heat cycle test described above, it is preferably 20 to 300 μm, and more preferably 30 to 150 μm.

[0041] In the nonflammable sheet 1 of the present invention, the weight ratio of the glass fiber cloth 2 to the resin composition layer 3 is preferably 5 to 50 mass%, more preferably 10 to 35 mass%, and particularly preferably 10 to 30 mass%, relative to the total mass of the glass fiber cloth 2 and the resin composition layer 3, from the viewpoint of achieving both transparency and nonflammability before and after the specific heat cycle test described above. Furthermore, when a foam layer 4 is provided, the proportion of the glass fiber cloth 2 in the total mass of the nonflammable sheet 1 after peeling off the peelable protective film 5 (i.e., the mass excluding the peelable protective film 5) (= mass (g) of the glass fiber cloth 2 / mass (g) excluding the peelable protective film 5 × 100(%)) is, for example, 3 to 20 mass%, preferably 3 to 15 mass%, and more preferably 3 to 10 mass%.

[0042] (Film layer 4) In the non-combustible sheet 1 of the present invention, the film layer 4 is laminated on the resin composition layer 3 impregnated in the glass fiber cloth 2 as needed, and serves to further improve the transparency of the non-combustible sheet 1 before and after the specific heat cycle test described above, while also further improving the initial tear strength.

[0043] The film layer 4 is not particularly limited, but preferably contains a thermoplastic resin other than polyvinyl chloride resin. Examples of thermoplastic resins other than polyvinyl chloride resin include those that can be formed into a film even with a small amount of plasticizer, and a preferred example is a biaxially stretched film containing an amorphous thermoplastic resin other than polyvinyl chloride resin. Examples of thermoplastic resins other than polyvinyl chloride resin include polyester resin, polycarbonate resin, and polyamide resin, and the film layer 4 may contain at least one of these. The film layer 4 may also be free of polyvinyl chloride resin. To further improve the initial tear strength of the nonflammable sheet 1, the film layer 4 may have an Elmendorf tear propagation resistance of 1 N / mm or more in both the longitudinal and transverse directions, preferably 3 to 20 N / mm, and more preferably 5 to 15 N / mm. In particular, from the perspective of achieving a balance between chemical resistance (including alkaline detergent resistance when used as a hanging smoke barrier), improved initial tear strength, and transparency, the film layer 4 preferably contains a polyester resin. Examples of the polyester resin include polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). The Elmendorf tear propagation resistance refers to the tear strength (N) measured using an Elmendorf tearing machine manufactured by Toyo Seiki Seisakusho Co., Ltd. in accordance with JIS K7128-2·1998, and the tear propagation resistance (N / mm) obtained by dividing the measured value by the film thickness. The tear strength is the average value of the test results for 20 samples in each of the longitudinal and transverse directions.

[0044] The content of the plasticizer in the film layer 4 is, for example, 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less, even more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less. Examples of the plasticizer include those known as plasticizers for vinyl chloride resins, such as phthalate-based plasticizers such as di-n-butyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, diethyldecyl phthalate, diisodecyl phthalate, butyl benzyl phthalate, and di-2-ethylhexyl isophthalate; 2-ethylhexyl adipate, di-2-decyl adipate, dibutyl sebacate, and 2-ethylhexyl sebacate; fatty acid ester plasticizers such as tributyl phosphate, tri-2-ethylhexyl phosphate, 2-ethylhexyl diphenyl phosphate, tricresyl phosphate, etc.; trimellitate ester plasticizers such as tri-2-ethylhexyl trimellitate and trioctyl trimellitate; polyester plasticizers such as adipic acid polyester plasticizers and phthalic acid polyester plasticizers; and terephthalic acid plasticizers.

[0045] The film layer 4 may contain inorganic or organic particles such as calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, tin oxide, antimony trioxide, carbon black, molybdenum disulfide, acrylic crosslinked polymers, styrene crosslinked polymers, silicone resins, fluororesins, benzoguanamine resins, phenolic resins, and nylon resins on the surface facing the resin composition layer 3 (the surface in contact with the surface portions 31 and 32 of the resin composition layer 3 in FIGS. 2 to 4 ). This improves adhesion between the resin composition layer 3 and the film layer 4, making it difficult for the resin composition layer 3 and the film layer 4 to peel off, for example, when the protective film 5 described below is peeled off during use of the nonflammable sheet 1. This effect becomes even more pronounced when an antistatic layer 6 containing metal or metal compound fine particles described below is laminated on the surface of the film layer 4. That is, when an antistatic layer 6 containing metal or metal compound fine particles (described later) is laminated on the surface side of the film layer 4 so as to be in contact with the protective film 5, the protective film 5 may be somewhat difficult to peel from the antistatic layer 6. However, by incorporating the inorganic or organic particles into the surface of the film layer 4 facing the resin composition layer 3 as described above, the inorganic or organic particles have an anchoring effect, which improves adhesion between the resin composition layer 3 and the film layer 4 and facilitates peeling of the protective film 5. The film layer 4 can be subjected to surface treatment such as corona treatment, flame treatment, or plasma treatment as necessary, and may also be provided with a coating layer that imparts various functions such as easy slippage and easy adhesion, or a hard coat layer that improves abrasion resistance, etc.

[0046] For example, when an antistatic layer 6 containing a metal or a metal compound is provided on the surface side of the film layer 4 as shown in FIG. 4, the total mass (g / m ) of the film layer 4 is adjusted to a value lower than the total mass (g / m ) of the film layer 4 from the viewpoint of further reducing the surface resistivity before and after a specific heat cycle test, further reducing the change in the surface resistivity before and after a specific heat cycle test, and obtaining better transparency. 2 ) relative to the mass (g / m 2The proportion of ) is preferably 1% by mass or less, more preferably 0.3% by mass or less, even more preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, and even more preferably 0% by mass.

[0047] In the non-combustible sheet of the present invention, the film to be used for the film layer 4 preferably has excellent transparency and smoothness. As for the transparency of the film to be used for the film layer 4, for example, the total light transmittance (JIS K 7105:1981) is preferably 90% or more, more preferably 91 to 98%. Furthermore, for example, the haze (JIS K 7105:1981) is preferably 1.5% or less, more preferably 0.3 to 1.0%.

[0048] (Antistatic layer 6 containing metal or metal compound) The non-combustible sheet 1 of the present invention has a surface resistivity of 1×10 11 As mentioned above, it is necessary to make the surface resistivity lower than 1 × 10 10 From the viewpoints of further reducing the adhesion of dust when used for a long period of time as a hanging smoke barrier by setting the resistivity at Ω or less, further reducing the change in surface resistivity before and after a specific heat cycle test, and obtaining better transparency, it is preferable to include an antistatic layer 6 containing a metal or a metal oxide on the surface side portion of the resin composition layer 3 (referred to as 31 and 32 in Figure 1) when no film layer 4 is laminated, or on the surface side portion of the film layer 4 (referred to as 41 and 42 in Figures 2 and 3) when the film layer 4 is laminated, as shown in Figures 2 and 3.

[0049] In the antistatic layer 6 containing a metal or a metal compound, examples of the metal element include Ag, Ni, Cu, Sn, Sb, Al, In, Ti, etc., including metal elements having a standard electrode potential of less than 0 eV when in the form of a simple metal. Examples of metal compounds include metal oxides (antimony pentoxide, tin oxide, zinc oxide, indium oxide, antimony-doped indium oxide, tin-doped indium oxide, silver oxide, etc.). The antistatic layer 6 may also be free of fine particles made of barium sulfate, calcium carbonate, aluminum oxide, magnesium silicate, glass, etc. Examples of the form in which the metal or metal compound is contained include a metal or metal compound thin film formed by vapor deposition, sputtering, plating, etc., or a layer in which metal or metal compound fine particles are dispersed in a binder resin. Examples of the shape of the metal or metal compound fine particles include granular, flake, and needle (fibrous) shapes. The average particle diameter of the metal or metal compound fine particles can be determined, for example, by the BET method (specific surface area (m ) measured by nitrogen gas adsorption method). 2 By making the specific surface area diameter (calculated as the average particle diameter from the specific surface area diameter (particle diameter) in a conventional manner from the specific surface area diameter (particle diameter) of the non-combustible material ...

[0050] When the antistatic layer 6 containing a metal or metal compound contains metal or metal compound fine particles, it preferably contains a fixing resin that fixes the metal or metal compound fine particles to the substrate. That is, the antistatic layer 6 is preferably a layer containing a fixing resin and metal or metal compound fine particles dispersed in the fixing resin. Examples of fixing resins include polyurethane resins, polyester resins, acrylic resins, polyether resins, cellulose resins, polyvinyl alcohol resins, epoxy resins, polyvinylpyrrolidone, polystyrene resins, polyethylene glycol, and pentaerythritol. Polyurethane resins, polyester resins, and acrylic resins are particularly preferred. Examples of acrylic resins include modified acrylic resins (urethane-modified, polyester-modified, polycarbonate-modified, fluorine-modified, etc.). The mass of the antistatic layer 6 is, for example, 0.1 to 10 g / m per layer from the viewpoint of achieving a good balance between surface resistivity and transparency before and after the specific heat cycle test described above. 2 and 0.1 to 5 g / m 2 is preferably 0.1 to 3 g / m 2 More preferably, the range is 0.1 to 1 g / m 2 is particularly preferred. The metal or metal compound may be present on the surface of the resin composition layer 3 or film layer 4. The resin composition layer 3 or film layer 4, which is provided with the antistatic layer 6 containing a metal or metal compound, has a metal or metal compound content within a range of 10% of the thickness of the layer from the center in the thickness direction of the layer (for example, when the thickness of the resin composition layer 3 or film layer 4 is 100 μm, the range of 40 to 60 μm from the one surface in the thickness direction, with the center being a distance of 50 μm from the one surface in the thickness direction), of which the content is, for example, 1 mass % or less, e.g., 0.1 mass % or less, e.g., 0.01 mass % or less, relative to the mass of the layer within this range. The thickness of the antistatic layer 6 is, for example, 0.01 to 3 μm per layer, e.g., 0.05 to 1 μm is preferred. The mass ratio of the adhesive resin to the metal or metal compound fine particles in the antistatic layer 6 (mass of the adhesive resin (g / m)) is preferably 0.01 mass % or less, e.g., 0.01 mass % or less, e.g., 0.01 mass % or less. 2 ): mass of metal or metal compound particles (g / m 2)) is preferably 10:1 to 1:1, more preferably 8:1 to 2:1, and particularly preferably 4:1 to 2:1, from the viewpoint of achieving a better balance between the surface resistivity and transparency before and after the specific heat cycle test described above. Furthermore, when an antistatic layer 6 containing a metal or a metal compound is provided, the surface smoothness can be, for example, a surface roughness Ra of 1 to 200 nm. Furthermore, the total mass (g / m 2 ) to the mass (g / m) of metal and metal compound particles 2 The proportion of ) is 50 to 10% by mass, preferably 30 to 20% by mass.

[0051] (Removable protective film 5 that is peeled off when in use) If necessary, the noncombustible sheet 1 of the present invention can further have a peelable protective film 5 laminated on the surface side of the resin composition layer 3 or the film layer 4 (if an antistatic layer 6 is provided on the surface side of the resin composition layer 3 or the film layer 4, then on the surface side of the antistatic layer 6). This makes it easier to prevent scratches and the like from occurring on the noncombustible sheet 1 during construction, which would reduce transparency and aesthetic appeal, for example, when the noncombustible sheet 1 of the present invention is used as a hanging smoke barrier.

[0052] Examples of the peelable protective film 5 that is peeled off during use include polyethylene film, polytetrafluoroethylene film, polypropylene film, and polyester film. In particular, a light-transmitting protective film is preferred as the peelable protective film 5 that is peeled off during use. This is because, for example, when the resin composition forming the resin composition layer 3 is a photocurable curable resin composition, it is easy to prevent scratches on the resin composition layer 3 or the film layer 4 during the curing process of the cured resin composition, which would reduce transparency and aesthetic appeal. The light transmittance is not particularly limited as long as it transmits light that cures the photocurable resin. Examples include films that transmit light with wavelengths of 100 to 400 nm and films that transmit light with wavelengths of 250 to 400 nm. The light transmittance of the protective film 5 is preferably 40% or more, more preferably 50% or more, and particularly preferably 60% or more, as measured by a UV transmittance meter (Shimadzu Corporation, product name: UV3150) at a measurement wavelength of 250 to 400 nm.

[0053] The peelable protective film 5, which is peeled off when used, is not particularly limited in transparency and smoothness, since it is peeled off when used, for example, as a smoke barrier, etc. For example, from the viewpoint of cost, the total light transmittance may be about 80 to 95% (JIS K 7105:1981) and the haze may be about 2 to 10% (JIS K 7105:1981).

[0054] (Properties and performance of non-combustible sheet 1) Before and after the heat cycle test of the non-flammable sheet, the surface resistivity was 1 x 10 11 It must be Ω or less. <Heat cycle test conditions> The non-flammable sheet was cut into a size of 100 mm x 100 mm to prepare a sample, and the sample was placed in a thermo-hygrostat (manufactured by Espec Corporation, product name PSL-2KPH) that had been initially set to a temperature of 23°C and a relative humidity of 50% RH. A total of 10 cycles were performed, with the following steps (1) to (5) being considered as one cycle. (1) The temperature is changed from 23°C and 50% RH relative humidity to 60°C and 50% RH relative humidity over a period of 14 minutes. (2) Maintain the temperature of 60°C and the relative humidity of 50% for 8 hours. (3) The temperature is changed from 60°C and 50% RH to 20°C and 50% RH over a period of 45 minutes. (4) Maintain the above temperature of 20°C and relative humidity of 50% RH for 8 hours. (5) The temperature and relative humidity are changed from 20°C and 50% RH to 23°C and 50% RH over a period of 1 minute.

[0055] The inventors of the present invention have conducted research and found that the non-combustible sheets disclosed in Patent Documents 1 to 3 have a surface resistivity of 1×10 15 As a result of intensive research by the present inventors, it was found that the surface resistivity was about 1×10 before and after the specific heat cycle test. 11 It has been found that the adhesion of dust can be reduced by setting the surface resistivity at 1.0×10 Ω or less before and after a specific heat cycle test. 10 Ω or less, 5.0×10 9 There is no particular restriction on the lower limit, but for example, 1×10 5 Ω or more, and from the viewpoint of further improving transparency, 1.0×10 7 Ω or more, preferably 1.0×10 8 Ω or more, more preferably 1.0×10 9 Examples include Ω and above.

[0056] The surface resistivity is measured in accordance with JIS K 6911 1995 5.13.2 Resistivity using a high resistance meter 4339B manufactured by Agilent Technologies Inc. as the measuring device, with an applied voltage of 100 V x 1 minute.

[0057] In addition, from the viewpoint of ensuring that the change in surface resistivity before and after the specific heat cycle test is further reduced, the difference in surface resistivity before and after the specific heat cycle test (= surface resistivity (Ω) after the specific heat cycle test - surface resistivity (Ω) before the specific heat cycle test) is 1.0 x 10 10 Ω or less is preferable, 5.0×10 9 Ω or less is more preferable.

[0058] The thickness of the noncombustible sheet 1 of the present invention is, for example, 100 to 500 μm, preferably 150 to 300 μm, as the thickness of the noncombustible sheet 1 after peeling off the peelable protective film 5 that is peeled off during use (i.e., the thickness excluding the peelable protective film 5 that is peeled off during use). Furthermore, the mass of the noncombustible sheet 1 of the present invention is, for example, 100 to 500 g / m as the mass of the noncombustible sheet 1 after peeling off the peelable protective film 5 that is peeled off during use (i.e., the mass excluding the peelable protective film 5 that is peeled off during use). 2 and 150 to 300 g / m 2 In the noncombustible sheet 1 of the present invention, the total mass of the resin composition layer and the film layer is preferably 150 to 300 g / m 2 , more preferably 150 to 250 g / m 2 This is preferable because it is easier to achieve both non-combustibility and tear strength.

[0059] In order to ensure transparency before and after the specific heat cycle test, the total light transmittance of the non-combustible sheet 1 of the present invention is preferably 85% or more, more preferably 90% or more. Furthermore, the haze of the non-combustible sheet 1 of the present invention before and after the specific heat cycle test is preferably 20% or less, more preferably 10% or less, even more preferably 5% or less, particularly preferably 3% or less, and even more preferably 1% or less. The total light transmittance and haze of the non-combustible sheet 1 are values measured according to JIS K7375 2008 "Plastics - Determination of total light transmittance and total light reflectance."

[0060] As described above, in order to ensure high transparency before and after the specific heat cycle test, for example, when a surfactant is contained in the layer that will become the surface layer when used as a smoke barrier, the content of the surfactant in the layer can be adjusted appropriately, or an antistatic layer 6 containing a metal or a metal compound can be provided, or the content of the metal or metal compound in the antistatic layer 6 can be adjusted, or the thickness of the glass fiber cloth, the refractive index difference between the glass fiber cloth 2 and the resin composition layer 3, the average filament diameter of the glass fiber, the number of filaments, or the weave density of the glass cloth can be adjusted.

[0061] In the noncombustible sheet 1 of the present invention, the initial tear strength can be increased by providing the film layer 4. From the viewpoint of ensuring a higher initial tear strength, the initial tear strength is preferably 30 to 100 (N), more preferably 40 to 100 (N), and particularly preferably 50 to 100 (N). In the present invention, the initial tear strength is measured and calculated as follows. (Test Method) In accordance with JIS R 3420:2013, Section 7.16, Method C (trapezoid method), 75 mm × 150 mm test pieces were taken from a non-combustible sheet in both the vertical and horizontal directions. Anti-slip tape (manufactured by Sekisui Chemical Co., Ltd., product name: 600S) was attached to both the front and back of each of the two trapezoidal sections including the right angle (corresponding to trapezoidal section A shown in Figure 5). Without making any cuts, the maximum load was measured using a constant-rate load tensile tester (manufactured by Orientec Co., Ltd., product name: RTC-1310A). The average of the maximum load in the vertical direction and the maximum load in the horizontal direction (= (maximum load in the vertical direction (N) + maximum load in the horizontal direction (N)) / 2) was defined as the initial tear strength (N).

[0062] The non-combustible sheet 1 of the present invention is provided with a flame-retardant property (non-combustibility) because it contains the glass fiber cloth 2. The non-combustible property of the non-combustible sheet 1 of the present invention is measured in accordance with 4.10.2 Heat Generation Test and Evaluation Method in the "Fire Resistance Performance Test and Evaluation Procedure Manual" (revised version of March 1, 2014) of the Japan Testing Center for Construction Materials, a general incorporated foundation, when a radiant electric heater applies 50 kW / m to the surface of the sheet. 2In a heat generation test using radiant heat, the maximum heat generation rate after heating begins is 200 kW / m for 10 seconds or more. 2 The total calorific value does not exceed 8MJ / m 2 It is preferable that the following is true: In order to further improve the non-flammability, for example, a flame retardant may be added to the resin composition layer 3 and the film layer 4, or the amount of organic matter may be reduced.

[0063] The method for producing the nonflammable sheet 1 of the present invention is not particularly limited, and examples thereof include the following production method. First, the above-mentioned glass fiber cloth 2 and the uncured cured resin composition that constitutes the resin composition layer 3 are prepared. The cured resin composition is applied to a film (e.g., a polyester film) that will become the film layer 4. The glass fiber cloth 2 is placed on top of the cured resin composition to impregnate the glass fiber 2 with the cured resin composition. Another film that will become the film layer 4 is then placed on the glass fiber cloth 2. Pressure is applied to the surfaces of each of the two film layers 4 to further impregnate the glass fiber cloth 2 with the cured resin composition. The cured resin composition is cured by heating or light irradiation, resulting in the nonflammable sheet 1 in which the cured resin composition layer 3 is impregnated into the glass fiber cloth 2 and the film layer 4 is laminated on the cured resin composition layer 3 (the nonflammable sheet 1 is laminated in the order of film layer 4 / resin composition layer 3 impregnated in the glass fiber cloth 2 / film layer 4). When the non-combustible sheet 1 does not include the film layer 4, the film layer 4 is replaced with a protective film 5 that is peeled off at the time of use, and the protective film 5 is then peeled off.

[0064] The nonflammable sheet 1 of the present invention can also be produced by the following method. First, the glass fiber cloth 2 and the thermoplastic resin composition constituting the resin composition layer 3 are prepared. Next, two films to be used as the film layer 4 are prepared, the thermoplastic resin composition is applied to the films, and the glass fiber cloth 2 is placed on top of the thermoplastic resin composition to impregnate the glass fibers 2 with the thermoplastic resin composition. Another film to be used as the film layer 4 is placed on the glass fiber cloth 2, and pressure is applied to the surfaces of the two film layers 4 to further impregnate the glass fiber cloth 2 with the cured resin composition. The thermoplastic resin composition is then dried and solidified, thereby obtaining a nonflammable sheet 1 in which the thermoplastic resin composition layer 3 is impregnated into the glass fiber cloth 2 and the film layer 4 is laminated on the thermoplastic resin composition layer 3 (a nonflammable sheet 1 laminated in the order of film layer 4 / resin composition layer 3 impregnated in the glass fiber cloth 2 / film layer 4).

[0065] The antistatic layer 6 can be provided on the front surface of the noncombustible sheet 1 obtained above. When the noncombustible sheet 1 includes a film layer 4, a film already provided with the antistatic layer 6 can be used. The antistatic layer 6 can be provided by any known means.

[0066] Furthermore, the method for producing a non-flammable sheet of the present invention can be a method for producing a non-flammable sheet comprising a glass fiber cloth, a photocurable resin composition layer impregnated in the glass fiber cloth, and a film layer laminated on the photocurable resin composition layer, and can include the steps of: Step A: preparing at least two light-transmitting thermoplastic resin films laminated with light-transmitting protective films; and Step B: sandwiching the uncured photocurable resin composition in which the glass fiber cloth has been impregnated between the two thermoplastic resin films obtained in Step A with the light-transmitting protective films facing outward; and irradiating the uncured photocurable resin composition with light to cure the uncured photocurable resin composition.

[0067] (Uses of the non-flammable sheet of the present invention) The nonflammable sheet of the present invention can be used as a hanging smoke barrier attached to the ceiling of a building. Examples of such hanging smoke barriers include known ones using a nonflammable sheet of glass cloth and resin. For example, a hanging smoke barrier includes a mounting rail attached to the ceiling surface of a building, a flexible nonflammable sheet suspended by the mounting rail at its upper end, and a pair of end mullions located on both sides of the nonflammable sheet, with the nonflammable sheet and the end mullions separably joined. In particular, the nonflammable sheet of the present invention is suitable for use as a tension-type hanging smoke barrier when the outermost layer of the hanging smoke barrier is made of a thermoplastic resin, since high-frequency welding is possible. In the present invention, the tension-type hanging smoke barrier is a hanging wall formed by tensioning a nonflammable sheet between two pairs of mullions. For example, a hanging smoke barrier without a mesh on the lower side of the nonflammable sheet when installed hanging from a ceiling is included. Furthermore, when the transparency is improved, it can be used as a substitute for glass, and therefore can be applied to other uses where glass is used, such as partitions, room dividers, smokeproof sheets, smokeproof curtains (for example, those used in factories, etc.). In addition, in the noncombustible sheet 1 of the present invention, the mass of the curable resin composition layer 4 is, for example, 20 to 100 g / m 2 , more preferably 20 to 50 g / m 2 In this case, the flexibility is further improved, and it is easier to make it into a roll product. The length of the roll product in the longitudinal direction may be, for example, 5 to 300 m. [Example]

[0068] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0069] The resin composition constituting the resin composition layer 3, which is impregnated into the glass fiber cloth 2, was a mixture of acrylic syrup (a 1:1 mass ratio mixture of "Acrysirup XD-8005" (refractive index 1.550) and "Acrysirup XD-8006" (refractive index 1.570) manufactured by Ryoko Co., Ltd.), vinyl ester resin (manufactured by Japan U-PICA Corporation), styrene monomer (manufactured by Japan U-PICA Corporation), bifunctional (meth)acrylate, photopolymerization initiator (Omnirad 184 manufactured by IGM), and surfactant ("Electrostripper ME-2" manufactured by Kao Corporation, solid content 50% by mass) as an antistatic agent, as shown in Table 1. The bifunctional (meth)acrylate curing agent used was NPGDA (neopentyl glycol diacrylate, molecular weight 212, manufactured by Japan U-PICA Corporation) as shown in Table 1. The amount of the photopolymerization initiator was 3 parts by mass per 100 parts by mass of acrylic syrup or 100 parts by mass of the total of the vinyl ester resin, styrene monomer, and bifunctional (meth)acrylate. The film layer 4 was a commercially available biaxially stretched polyester film (trade name "Cosmoshine (registered trademark) A4300" manufactured by Toyobo Co., Ltd., thickness 50 μm, mass 70 g / m 2 The total light transmittance (JIS K 7105:1981) was 93%, and the haze (JIS K 7105:1981) was 0.9%. The vinyl chloride resin was a commercially available vinyl chloride resin film (manufactured by Okamoto Corporation, general-purpose PVC #320, thickness 100 mm). μm, mass 120g / m 2 ) was used. A removable protective film 5 was used, which was peeled off when used. As an example, polypropylene film (thickness 40 μm, mass 36 g / m 2 ) coated on one side with an acrylic ester adhesive that would releasably adhere to the film layer 4, and a PET film (thickness 50 μm, total light transmittance 93%, haze 4%) were used.

[0070] Example 1 (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 90 / 25 mm and a weft density of 90 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECC1200 1 / 0 1.0Z" (average filament diameter 4.5 μm, average filament count 100, twist count 1.0Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. The glass fiber fabric was then subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric being 100 N / m in the warp direction, and subjected to a widening treatment once to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 90 threads / 25 mm, a weft density of 90 threads / 25 mm, a thickness of 27 μm, and a mass of 30 g / m 2 , and the refractive index was 1.561.

[0071] (Lamination of antistatic layer 6 onto film layer 4) An antistatic layer 6 was laminated on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The antistatic layer 6 was formed by mixing and dispersing tin oxide fine particles (average particle diameter 20 nm) in a polyester resin as a binder resin such that the mass ratio of the binder resin to the tin oxide fine particles (binding resin:tin oxide fine particles) was 75:25, and then coating and drying the resulting antistatic agent on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The mass of the formed antistatic layer 6 was 0.5 g / m 2 , and the thickness was 0.4 μm.

[0072] (Lamination of a removable protective film 5 to be peeled off during use onto the film layer 4 (on the antistatic layer 6 side)) The aforementioned COSMOSHINE (registered trademark) A4300 having the antistatic layer 6 on one side thereof as the film layer 4 was laminated with the aforementioned polypropylene film having an acrylic ester adhesive applied to one side thereof as the peelable protective film 5 to be peeled off during use, on the antistatic layer 6, with the adhesive facing the antistatic layer 6. The laminate was then dried to obtain a laminate A having a laminate structure of peelable protective film 5 to be peeled off during use / acrylic ester adhesive / antistatic layer 6 / film layer 4 of COSMOSHINE (registered trademark) A4300. Two sheets of the laminate A were prepared.

[0073] (Manufacture of non-flammable sheets) A cured resin composition shown in Table 1 was applied as resin composition layer 3 to the COSMOSHINE (registered trademark) A4300 side of one sheet of the obtained laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use). Next, the obtained glass fiber cloth 2 was placed on top of the cured resin composition that was used as resin composition 3, and left to stand for 1 minute to impregnate the gaps in the glass fiber cloth 2 with the cured resin composition. Next, the other of the obtained laminates A was placed on top of the COSMOSHINE (registered trademark) A4300 side of the laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use) so that it faced the cured resin composition 3, and a roller was used to roll the laminate A over the cured resin composition layer 3 until the mass of the cured resin composition layer 3 was 90 g / m. 2 Thereafter, with the peelable protective film 5, which is peeled off during use, still laminated, the cured resin composition to be used as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2) to cure the cured resin composition to form a cured resin composition layer 3, thereby obtaining a nonflammable sheet having the laminate structure illustrated in FIG. 4 (peelable protective film 5 that is peeled off when used / acrylic ester-based adhesive that is peelable together with protective film 5 / antistatic layer 6 / film layer 4 (Cosmoshine (registered trademark) A4300) / resin composition layer 3 contained in a state impregnated in glass fiber cloth 2 / film layer 4 (Cosmoshine (registered trademark) A4300) / antistatic layer 6 / acrylic ester-based adhesive that is peelable together with protective film 5 / peelable protective film 5 that is peeled off when used). In the obtained nonflammable sheet, the gaps between the glass fibers of the glass fiber cloth were impregnated with cured resin composition layer 3 (a cured product of the resin composition), and cured resin composition layers 3 were formed on both sides of the glass fiber cloth layer.

[0074] <Example 2> (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 95 / 25 mm and a weft density of 95 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECBC3000 1 / 0 0.5Z" (average filament diameter: 4 μm, average filament count: 50, twist count: 0.5Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), manufactured by Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. Then, the glass fiber fabric was subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric in the warp direction set to 100 N / m, and the width was expanded twice to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 95 threads / 25 mm, a weft density of 95 threads / 25 mm, a thickness of 13 μm, and a mass of 12 g / m 2 , and the refractive index was 1.561.

[0075] (Lamination of antistatic layer 6 onto film layer 4) An antistatic layer 6 was laminated on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The antistatic layer 6 was formed by mixing and dispersing tin oxide fine particles (average particle diameter 20 nm) in a polyester resin as a binder resin such that the mass ratio of the binder resin to the tin oxide fine particles (binding resin:tin oxide fine particles) was 75:25, and then coating and drying the resulting antistatic agent on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The mass of the formed antistatic layer 6 was 0.5 g / m 2 , and the thickness was 0.4 μm.

[0076] (Lamination of a removable protective film 5 to be peeled off during use onto the film layer 4 (on the antistatic layer 6 side)) The aforementioned COSMOSHINE (registered trademark) A4300 having the antistatic layer 6 on one side thereof as the film layer 4 was laminated with the aforementioned polypropylene film having an acrylic ester adhesive applied to one side thereof as the peelable protective film 5 to be peeled off during use, on the antistatic layer 6, with the adhesive facing the antistatic layer 6. The laminate was then dried to obtain a laminate A having a laminate structure of peelable protective film 5 to be peeled off during use / acrylic ester adhesive / antistatic layer 6 / film layer 4 of COSMOSHINE (registered trademark) A4300. Two sheets of the laminate A were prepared.

[0077] (Manufacture of non-flammable sheets) A cured resin composition shown in Table 1 was applied as resin composition layer 3 to the COSMOSHINE (registered trademark) A4300 side of one sheet of the obtained laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use). Next, the obtained glass fiber cloth 2 was placed on top of the cured resin composition that was used as resin composition 3, and left to stand for 1 minute to impregnate the gaps in the glass fiber cloth 2 with the cured resin composition. Next, the other of the obtained laminates A was placed on top of the COSMOSHINE (registered trademark) A4300 side of the laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use) so that it faced the cured resin composition 3, and a roller was used to roll the laminate A over the cured resin composition layer 3 until the mass of the cured resin composition layer 3 was 90 g / m. 2Thereafter, with the peelable protective film 5, which is peeled off during use, still laminated, the cured resin composition to be used as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2 ) to cure the cured resin composition to form a cured resin composition layer 3, thereby obtaining a nonflammable sheet having the laminate structure illustrated in FIG. 4 (peelable protective film 5 that is peeled off when used / acrylic ester-based adhesive that is peelable together with protective film 5 / antistatic layer 6 / film layer 4 (Cosmoshine (registered trademark) A4300) / resin composition layer 3 contained in a state impregnated in glass fiber cloth 2 / film layer 4 (Cosmoshine (registered trademark) A4300) / antistatic layer 6 / acrylic ester-based adhesive that is peelable together with protective film 5 / peelable protective film 5 that is peeled off when used). In the obtained nonflammable sheet, the gaps between the glass fibers of the glass fiber cloth were impregnated with cured resin composition layer 3 (a cured product of the resin composition), and cured resin composition layers 3 were formed on both sides of the glass fiber cloth layer.

[0078] Example 3 (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 95 / 25 mm and a weft density of 95 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECBC3000 1 / 0 0.5Z" (average filament diameter: 4 μm, average filament count: 50, twist count: 0.5Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), manufactured by Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. Then, the glass fiber fabric was subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric in the warp direction set to 100 N / m, and the width was expanded twice to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 95 threads / 25 mm, a weft density of 95 threads / 25 mm, a thickness of 13 μm, and a mass of 12 g / m 2 , and the refractive index was 1.561.

[0079] (Lamination of antistatic layer 6 onto film layer 4) An antistatic layer 6 was laminated on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The antistatic layer 6 was formed by mixing and dispersing tin oxide fine particles (average particle diameter 20 nm) in a polyester resin as a binder resin such that the mass ratio of the binder resin to the tin oxide fine particles (binding resin:tin oxide fine particles) was 75:25, and then coating and drying the resulting antistatic agent on one side of the Cosmoshine (registered trademark) A4300 used as the film layer 4. The mass of the formed antistatic layer 6 was 0.5 g / m 2 , and the thickness was 0.4 μm.

[0080] (Lamination of a removable protective film 5 to be peeled off during use onto the film layer 4 (on the antistatic layer 6 side)) The aforementioned COSMOSHINE (registered trademark) A4300 having the antistatic layer 6 on one side thereof as the film layer 4 was laminated with the aforementioned polypropylene film having an acrylic ester adhesive applied to one side thereof as the peelable protective film 5 to be peeled off during use, on the antistatic layer 6, with the adhesive facing the antistatic layer 6. The laminate was then dried to obtain a laminate A having a laminate structure of peelable protective film 5 to be peeled off during use / acrylic ester adhesive / antistatic layer 6 / film layer 4 of COSMOSHINE (registered trademark) A4300. Two sheets of the laminate A were prepared.

[0081] (Manufacture of non-flammable sheets) A cured resin composition shown in Table 1 was applied as resin composition layer 3 to the COSMOSHINE (registered trademark) A4300 side of one sheet of the obtained laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use). Next, the obtained glass fiber cloth 2 was placed on top of the cured resin composition that was used as resin composition 3, and left to stand for 1 minute to impregnate the gaps in the glass fiber cloth 2 with the cured resin composition. Next, the other of the obtained laminates A was placed on top of the COSMOSHINE (registered trademark) A4300 side of the laminate A (i.e., the side opposite to the peelable protective film 5 that is peeled off during use) so that it faced the cured resin composition 3, and a roller was used to roll the laminate A over the cured resin composition layer 3 until the mass of the cured resin composition layer 3 was 40 g / m. 2 Thereafter, with the peelable protective film 5, which is peeled off during use, still laminated, the cured resin composition to be used as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2) to cure the cured resin composition to form a cured resin composition layer 3, thereby obtaining a nonflammable sheet having the laminate structure illustrated in FIG. 4 (peelable protective film 5 that is peeled off when used / acrylic ester-based adhesive that is peelable together with protective film 5 / antistatic layer 6 / film layer 4 (Cosmoshine (registered trademark) A4300) / resin composition layer 3 contained in a state impregnated in glass fiber cloth 2 / film layer 4 (Cosmoshine (registered trademark) A4300) / antistatic layer 6 / acrylic ester-based adhesive that is peelable together with protective film 5 / peelable protective film 5 that is peeled off when used). In the obtained nonflammable sheet, the gaps between the glass fibers of the glass fiber cloth were impregnated with cured resin composition layer 3 (a cured product of the resin composition), and cured resin composition layers 3 were formed on both sides of the glass fiber cloth layer.

[0082] Example 4 (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 90 / 25 mm and a weft density of 90 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECC1200 1 / 0 1.0Z" (average filament diameter 4.5 μm, average filament count 100, twist count 1.0Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. The glass fiber fabric was then subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric being 100 N / m in the warp direction, and subjected to a widening treatment once to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 90 threads / 25 mm, a weft density of 90 threads / 25 mm, a thickness of 27 μm, and a mass of 30 g / m 2 , and the refractive index was 1.561.

[0083] (Manufacture of non-flammable sheets) A cured resin composition for the resin composition layer 3 shown in Table 1 was applied to a 50 μm thick PET film that would serve as a peelable protective film 5 to be peeled off during use. Next, the glass fiber cloth 2 obtained above was placed on top of the resin composition and left to stand for 1 minute, allowing the cured resin composition to be impregnated into the gaps in the glass fiber cloth 2. Next, another PET film of the same product as the PET film that would serve as the peelable protective film 5 to be peeled off during use was placed on top of the PET film, and a roller was used to roll the PET film up to a mass of 90 g / m2 of the cured resin composition layer 3. 2 Thereafter, while the PET film serving as the peelable protective film 5, which is peeled off during use, was still laminated, the resin composition serving as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2 ) to cure the resin composition, forming a cured resin composition layer 3, and a non-combustible sheet was obtained having a laminated structure of a peelable protective film 5 that is peeled off when used, the resin composition layer 3 contained in a state of being impregnated in the glass fiber cloth 2, and a peelable protective film 5 that is peeled off when used. In the obtained non-combustible sheet, the gaps between the glass fibers of the glass fiber cloth 2 were impregnated with the cured resin composition layer 3 (a cured product of the resin composition), and the cured resin composition layer 3 was formed on both sides of the glass fiber cloth layer.

[0084] <Example 5> (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 90 / 25 mm and a weft density of 90 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECC1200 1 / 0 1.0Z" (average filament diameter 4.5 μm, average filament count 100, twist count 1.0Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. The glass fiber fabric was then subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric being 100 N / m in the warp direction, and subjected to a widening treatment once to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 90 threads / 25 mm, a weft density of 90 threads / 25 mm, a thickness of 27 μm, and a mass of 30 g / m 2 , and the refractive index was 1.561.

[0085] (Manufacture of non-flammable sheets) A cured resin composition for the resin composition layer 3 shown in Table 1 was applied to a 50 μm thick PET film that would serve as a peelable protective film 5 to be peeled off during use. Next, the glass fiber cloth 2 obtained above was placed on top of the resin composition and left to stand for 1 minute, allowing the cured resin composition to be impregnated into the gaps in the glass fiber cloth 2. Next, another PET film of the same product as the PET film that would serve as the peelable protective film 5 to be peeled off during use was placed on top of the PET film, and a roller was used to roll the PET film up to a mass of 90 g / m2 of the cured resin composition layer 3. 2 Thereafter, while the PET film serving as the peelable protective film 5, which is peeled off during use, was still laminated, the resin composition serving as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2) to cure the resin composition, forming a cured resin composition layer 3, and a non-combustible sheet was obtained having a laminated structure of a peelable protective film 5 that is peeled off when used, the resin composition layer 3 contained in a state of being impregnated in the glass fiber cloth 2, and a peelable protective film 5 that is peeled off when used. In the obtained non-combustible sheet, the gaps between the glass fibers of the glass fiber cloth 2 were impregnated with the cured resin composition layer 3 (a cured product of the resin composition), and the cured resin composition layer 3 was formed on both sides of the glass fiber cloth layer.

[0086] <Comparative Example 1> The same procedures as in Example 1 were carried out except that the antistatic layer 6 was not laminated, and a nonflammable sheet for Comparative Example 1 was obtained, which had a laminate structure of a peelable protective film 5 that is peeled off during use / an acrylic ester-based adhesive that is peelable together with the protective film 5 / a film layer 4 (Cosmoshine (registered trademark) A4300) / a resin composition layer 3 contained in a state impregnated in a glass fiber cloth 2 / a film layer 4 (Cosmoshine (registered trademark) A4300) / an acrylic ester-based adhesive that is peelable together with the protective film 5 / a peelable protective film 5 that is peeled off during use.

[0087] <Comparative Example 2> (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 90 / 25 mm and a weft density of 90 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECC1200 1 / 0 1.0Z" (average filament diameter 4.5 μm, average filament count 100, twist count 1.0Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. The glass fiber fabric was then subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric being 100 N / m in the warp direction, and subjected to a widening treatment once to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 90 threads / 25 mm, a weft density of 90 threads / 25 mm, a thickness of 27 μm, and a mass of 30 g / m 2 , and the refractive index was 1.561.

[0088] (Lamination of a peelable protective film 5 onto the film layer 4, which is peeled off during use) The aforementioned COSMOSHINE (registered trademark) A4300 serving as film layer 4 was laminated with a polypropylene film serving as the aforementioned peelable protective film 5, which is peeled off during use, having an acrylic ester-based adhesive applied to one side thereof, so that the adhesive faced the COSMOSHINE (registered trademark) A4300 side, and dried to obtain Laminate B having a laminate structure of peelable protective film 5, which is peeled off during use, acrylic ester-based adhesive, and COSMOSHINE (registered trademark) A4300 serving as film layer 4. Two sheets of Laminate B were prepared.

[0089] (Manufacture of non-flammable sheets) A cured resin composition shown in Table 1 was applied as resin composition layer 3 to the COSMOSHINE (registered trademark) A4300 side of one sheet of the obtained laminate B (i.e., the side opposite to the peelable protective film 5 that is peeled off during use). Next, the obtained glass fiber cloth 2 was placed on top of the cured resin composition that was to be used as resin composition layer 3, and left to stand for 1 minute to impregnate the gaps in the glass fiber cloth 2 with the cured resin composition. Next, the other one of the obtained laminates B was placed on top of the COSMOSHINE (registered trademark) A4300 side of laminate B (i.e., the side opposite to the peelable protective film 5 that is peeled off during use) so that it faced the cured resin composition 3, and a roller was used to roll the laminate B on top of the cured resin composition layer 3 until the mass of the cured resin composition layer 3 was 90 g / m 2 Thereafter, with the peelable protective film 5, which is peeled off during use, still laminated, the cured resin composition to be used as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2 ) to cure the cured resin composition to form cured resin composition layer 3, and a nonflammable sheet of Comparative Example 2 was obtained, which had a laminated structure of peelable protective film 5 that is peeled off when used / acrylic ester-based pressure-sensitive adhesive that is peelable together with protective film 5 / film layer 4 (Cosmoshine (registered trademark) A4300) / resin composition layer 3 contained in a state impregnated in glass fiber cloth 2 / film layer 4 (Cosmoshine (registered trademark) A4300) / acrylic ester-based pressure-sensitive adhesive that is peelable together with protective film 5 / peelable protective film 5 that is peeled off when used. In the obtained nonflammable sheet, cured resin composition layer 3 (cured product of the resin composition) was impregnated into the gaps between the glass fibers of glass fiber cloth 2, and cured resin composition layers 3 were formed on both sides of the glass fiber cloth layer.

[0090] <Comparative Example 3> (Manufacture of glass fiber cloth 2) A plain weave glass fiber fabric with a warp density of 95 / 25 mm and a weft density of 95 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECBC3000 1 / 0 0.5Z" (average filament diameter: 4 μm, average filament count: 50, twist count: 0.5Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), manufactured by Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. Then, the glass fiber fabric was subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric in the warp direction set to 100 N / m, and the width was expanded twice to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 95 threads / 25 mm, a weft density of 95 threads / 25 mm, a thickness of 13 μm, and a mass of 12 g / m 2 , and the refractive index was 1.561.

[0091] (Lamination of a peelable protective film 5 onto the film layer 4, which is peeled off during use) The film layer 4 is a vinyl chloride resin film (manufactured by Okamoto Corporation, general-purpose PVC#320, thickness 100μm, weight 120g / m 2 ) peeled off during use as mentioned above An acrylic ester-based adhesive was applied to one side of a polypropylene film serving as a peelable protective film 5, and the adhesive was laminated onto the vinyl chloride resin film, followed by drying to obtain a laminate C having a laminate structure of peelable protective film 5 / acrylic ester-based adhesive / vinyl chloride resin film serving as film layer 4, which is peeled off when used. Two sheets of this laminate C were prepared.

[0092] (Manufacture of non-flammable sheets) A cured resin composition shown in Table 1 was applied as resin composition layer 3 to the vinyl chloride resin film side of one sheet of the obtained laminate C (i.e., the side opposite to the peelable protective film 5 that is peeled off during use). Next, the obtained glass fiber cloth 2 was placed on top of the cured resin composition that was to be used as resin composition layer 3, and left to stand for 1 minute, allowing the cured resin composition to be impregnated into the gaps in the glass fiber cloth 2. Next, the other of the obtained laminates C was placed on top of the laminate C so that the vinyl chloride resin film side of the laminate C (i.e., the side opposite to the peelable protective film 5 that is peeled off during use) faced the cured resin composition 3 side, and a roller was used to roll the laminate C on top of the cured resin composition layer 3 until the mass of the cured resin composition layer 3 was 40 g / m. 2 Thereafter, the cured resin composition was irradiated with light (light irradiation conditions: cumulative light amount 200 mJ / cm) using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) while the peelable protective film 5, which is peeled off when used, was still laminated. 2 ) to cure the cured resin composition to form cured resin composition layer 3, and a nonflammable sheet of Comparative Example 3 was obtained, which had a laminated structure of peelable protective film 5 that was peeled off when used / acrylic ester-based pressure-sensitive adhesive that was peelable together with protective film 5 / film layer 4 (vinyl chloride resin film) / resin composition layer 3 contained in a state impregnated in glass fiber cloth 2 / film layer 4 (vinyl chloride resin film) / acrylic ester-based pressure-sensitive adhesive that was peelable together with protective film 5 / peelable protective film 5 that was peeled off when used. In the obtained nonflammable sheet, the gaps between the glass fibers of glass fiber cloth 2 were impregnated with cured resin composition layer 3 (cured product of the resin composition), and cured resin composition layers 3 were formed on both sides of the layer of glass fiber cloth 2.

[0093] <Comparative Example 4> (Manufacture of glass fiber cloth) A plain weave glass fiber fabric with a warp density of 95 / 25 mm and a weft density of 95 / 25 mm was obtained using Unitika Glass Fiber Co., Ltd.'s "ECBC3000 1 / 0 0.5Z" (average filament diameter: 4 μm, average filament count: 50, twist count: 0.5Z) warp and weft yarns on an air jet loom. The fabric was then heated at 400°C for 30 hours to remove the spinning and weaving sizing agents. The fabric was then treated with a silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), manufactured by Chisso Corporation) to a concentration of 15 g / L, squeezed with a padder roll, and dried and cured at 120°C for 1 minute. Then, the glass fiber fabric was subjected to a water jet processing at a pressure of 1.5 MPa, with the tension of the glass fiber fabric in the warp direction set to 100 N / m, and the width was expanded twice to obtain a glass fiber fabric to be used as glass fiber cloth 2. The obtained glass fiber fabric 2 had a warp density of 95 threads / 25 mm, a weft density of 95 threads / 25 mm, a thickness of 13 μm, and a mass of 12 g / m 2 , and the refractive index was 1.561.

[0094] (Manufacture of non-flammable sheets) A cured resin composition for the resin composition layer 3 shown in Table 1 was applied to a 50 μm thick PET film that would serve as a peelable protective film 5 to be peeled off during use. Next, the glass fiber cloth 2 obtained above was placed on top of the resin composition and left to stand for 1 minute, allowing the cured resin composition to be impregnated into the gaps in the glass fiber cloth 2. Next, another PET film of the same product as the PET film that would serve as the peelable protective film 5 to be peeled off during use was placed on top of the PET film, and a roller was used to roll the PET film up to a mass of 90 g / m2 of the cured resin composition layer 3. 2 Thereafter, while the PET film serving as the peelable protective film 5, which is peeled off during use, was still laminated, the resin composition serving as the resin composition layer 3 was irradiated with light using a black light fluorescent lamp (product name FL15BLB, manufactured by Toshiba Corporation) (light irradiation conditions: cumulative light amount 200 mJ / cm 2) to cure the resin composition to form a cured resin composition layer 3, and a nonflammable sheet of Comparative Example 4 was obtained, which had a laminated structure of a peelable protective film 5 that was peeled off when used, the resin composition layer 3 contained in a state of being impregnated in the glass fiber cloth 2, and a peelable protective film 5 that was peeled off when used. In the obtained nonflammable sheet, the gaps between the glass fibers of the glass fiber cloth 2 were impregnated with the cured resin composition layer 3 (a cured product of the resin composition), and the cured resin composition layers 3 were formed on both sides of the layer of the glass fiber cloth 2.

[0095] In the examples and comparative examples, the weave density of the glass fiber fabric is JIS R 3420 2013 7.9. The thickness of the glass fiber fabric was measured and calculated in accordance with JIS The refractive index was measured and calculated in accordance with JIS R 3420 2013 7.10.1A. The mass of the glass fiber fabric was measured and calculated in accordance with JIS R 3420 2013 7.2. The refractive indexes of the cured resin composition layer 3 and the glass fiber fabric 2 were measured and calculated by the above-mentioned method. The Abbe numbers of the cured resin composition layer 3 and the glass fiber fabric 2 were measured and calculated by the above-mentioned method. The following evaluations were performed after the nonflammable sheet was produced and left indoors for one week.

[0096] (Heat cycle test and surface resistivity, total light transmittance, and haze before and after the heat cycle test) This was done by the method described above.

[0097] (Confirmation of the degree of dust accumulation when used for a long period as a smoke barrier) The non-flammable sheet obtained was subjected to the specific heat cycle test described above by peeling off the removable protective film 5 that is peeled off during use (if the protective film 5 contains a removable acrylate adhesive, the adhesive was also peeled off).The non-flammable sheet was then cut into 20cm square pieces, which were placed on a 15cm square test bench on which 50 pieces of paper cut into 1mm squares were scattered, and the sheet was then gently pulled up and evaluated based on the number of pieces of paper that stuck to the sheet.The paper used was 0.1mm thick and 70g / m2 in mass.2 The paper used was: The evaluation was based on the following criteria, with a score of 3 or above being considered a pass. 3 points: No paper pieces were stuck 2 points: 1 to 9 pieces of paper stuck to the 1 point: 10 or more pieces of paper stuck to the body

[0098] (Initial tear strength) This was done by the method described above.

[0099] The evaluation results are shown in Table 1.

[0100] [Table 1]

[0101] In Examples 1 to 5, the surface resistivity was 1×10 before and after a specific heat cycle test. 11 By setting the surface resistivity at 1×10 Ω or less, it was possible to reduce adhesion of dust when used for a long period of time as a hanging smoke barrier, for example. 11 Since the resistance exceeded Ω, it was not possible to reduce the adhesion of dust when used as a hanging smoke barrier for a long period of time.

[0102] Comparing Examples 4 and 5, Example 4 has a higher surfactant mass (g / m) than Example 5. 2 ) is 1 to 1.5 g / m 2 Therefore, excellent transparency was obtained while ensuring the function of reducing adhesion of dust when used for a long period of time as a hanging smoke barrier. Furthermore, Examples 1 to 3 have an antistatic layer 6 containing a metal or metal oxide so as to become a surface layer when used as a hanging smoke barrier, and therefore have a surface resistivity lower than 1 × 10 10Ω or less, further reducing the adhesion of dust when used for a long period of time as a smoke-proof hanging wall, further reducing the change in surface resistivity before and after the specific heat cycle test, and achieving better transparency. Furthermore, after the specific heat cycle test, Example 5 and Comparative Example 5 were found to be quite sticky, while Examples 1 to 3 were found to be almost sticky. Furthermore, for Examples 1 to 3, the difference in surface resistivity before and after the specific heat cycle test (= surface resistivity (Ω) after the specific heat cycle test - surface resistivity (Ω) before the specific heat cycle test) was 5.0 x 10 9 Ω or less, and it was confirmed that the antistatic performance was stable. Furthermore, since Examples 1 to 3 contained the film layer 4, the initial tear strength was also excellent. [Explanation of symbols]

[0103] 1. Non-flammable sheet 2. Glass fiber cloth 3...Resin composition layer 31, 32: Surface side portion of resin composition layer 4. Film layer 41, 42: Surface side portion of the film layer 5. Peelable protective film that is peeled off when in use 6. Antistatic layer

Claims

1. A non-flammable sheet comprising a glass fiber cloth and a resin composition layer impregnated in the glass fiber cloth, The non-combustible sheet had a surface resistivity of 1×10 before and after the following heat cycle test. １１ Non-flammable sheet with a resistance of Ω or less. <Heat cycle test conditions> The non-flammable sheet was cut into a size of 100 mm x 100 mm to prepare a sample, and the sample was placed in a thermo-hygrostat (manufactured by Espec Corporation, trade name PSL-2KPH) that had been initially set to a temperature of 23°C and a relative humidity of 50% RH. A total of 10 cycles were performed, with the following (1) to (5) being considered as one cycle. (1) The temperature is changed from 23° C. and 50% RH to 60° C. and 50% RH over a period of 14 minutes. (2) The temperature is kept at 60°C and the relative humidity is kept at 50% RH for 8 hours. (3) The temperature is changed from 60° C. and 50% RH to 20° C. and 50% RH over a period of 45 minutes. (4) The temperature is kept at 20°C and the relative humidity is kept at 50% RH for 8 hours. (5) The temperature is changed from 20° C. and 50% RH to 23° C. and 50% RH over a period of 1 minute.

2. The non-combustible sheet according to claim 1 , further comprising an antistatic layer containing a metal or a metal oxide, which serves as a surface layer when the non-combustible sheet is in use.

3. The non-flammable sheet contains a surfactant in a layer that becomes a surface layer when in use, The mass (g / m) of the surfactant in the non-flammable sheet ２ ) is 0.5 to 1.5 g / m ２ The non-flammable sheet according to claim 1,

4. The non-flammable sheet according to any one of claims 1 to 3, having a total light transmittance of 90% or more and a haze of 20% or less.

5. The nonflammable sheet according to any one of claims 1 to 4, which is for use in a hanging smoke barrier.

6. A hanging smoke barrier comprising the non-combustible sheet according to any one of claims 1 to 5.

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