JP2016186533A - Sound absorbing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and flexible noncombustible interior material that excels in reverberation suppressing and sound attenuating effects and is suitable for membrane ceiling structure used in indoor sports competition facilities, gymnasiums, indoor swimming pools, performance event halls, public auditoriums, ceremonial event facilities, railway station lobbies, airport lobbies, open-ceiling shopping malls and so forth.SOLUTION: A sound absorbing sheet has as a ventilation and diffusion layer fabric cloth made by weaving a multi-filament yarn, and configured as a laminate made by covering at least one face of this fabric cloth with a thermoplastic resin layer. Many ventilation holes of 0.5 to 2.5 mm in bore are so formed all over this laminate that a hole area rate of 2.5 to 12.5% is achieved as the total area of these ventilation holes, and the thermoplastic resin layer contains 1.5 to 10 mass% of heat-expanded particles relative to the thermoplastic resin layer.SELECTED DRAWING: Figure 1

Description

  The present invention is a ceiling area component and sound absorbing member installed in the ceiling of indoor stadiums, gymnasiums, indoor pools, event halls, public halls, ceremonial ceremonies, etc. Light-absorbing member as an accessory to the ceiling area component, both excellent in echo suppression effect and sound attenuation effect, and low in weight and flexibility that are unlikely to cause serious human damage even if it collapses in the unlikely event of an earthquake In addition, it relates to non-combustible interior materials that can be applied to the Building Standard Act property.

  As a non-combustible sound-absorbing interior material, a sound-absorbing cloth having a sound-absorbing property and a non-combustibility is obtained by weaving a bulky processed yarn in which glass long fibers are bulged in at least one part, and this sound-absorbing cloth is used. By adhering a relatively thin surface covering sheet material to the surface of a substrate (a large number of small-diameter through holes are perforated) as ceiling materials and wall materials for building interior decoration work (Patent Document 1) Perforated sound-absorbing plate (Patent Document 2) with the opening on the surface side of the through-hole closed, a small hole as a thin and non-combustible sound-absorbing decorative sheet to be attached to the wall surface, ceiling surface, floor surface or partition of a building A sound absorbing decorative sheet (Patent Document 3) comprising a large number of decorative film layers and non-combustible continuous foam layers, and an adhesive layer, a film layer provided with through-holes and openings with a diameter of at least 1 mm, It is disposed on the film layer comprising a fibrous material layer multilayer sound absorbing sheet (Patent Document 4), and various sound absorbing structures have been disclosed in. However, since all of them require a breathable sound absorption hole, ASTM-E1354 “Combustion test method for building materials”, Article 108-2 of the Building Standards Act enforcement order, and Article 2.9 of the 1998 revised Building Standards Act No., etc., does not lead to the certification of applicable materials for the Building Standard Act property that smoke leakage from the sound absorption holes is regarded as harmful smoke or gas for evacuation and satisfies nonflammability. By complying with these laws and regulations, the Minister of Land, Infrastructure, Transport and Tourism certification number can be obtained, and it is certified as a material applicable to the Building Standards Act. The material did not exist yet.

JP 09-250050 A JP 2001-132132 A JP 2010-196421 A Special table 2011-516929 gazette

  The present invention is excellent in an echo suppression effect and an acoustic attenuation effect as a sound absorbing member as a ceiling area constituting member and a sound absorbing member installed on a ceiling of a building, or as an accessory to a ceiling area constituting member. Lightweight and flexible seats that are unlikely to cause significant human damage, and the ceilings of indoor stadiums, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station lobby, An object of the present invention is to provide a sound-absorbing and non-combustible sheet having non-combustibility applicable to the Building Standard Act property when used for ceiling membranes such as atriums in airport lobbies and shopping malls.

  In order to solve the above-mentioned problem, in a laminate comprising a fiber fabric formed by weaving a multifilament yarn as a ventilation diffusion layer, and at least one surface of the fiber fabric being coated with a thermoplastic resin layer, By forming a large number of air holes scattered across the entire surface, and by including thermally expandable particles in the thermoplastic resin layer, the sheet is excellent in echo suppression effect and sound attenuation effect, and is lightweight and flexible. And when using for a ceiling membrane, it discovered that the sound-absorbing incombustible sheet which has the incombustibility applicable to a building standard law article was obtained, and came to complete this invention.

  That is, the sound-absorbing incombustible sheet of the present invention is a laminate comprising a fiber fabric formed by weaving a multifilament yarn as a ventilation diffusion layer, and a thermoplastic resin layer formed on at least one surface of the fiber fabric. A large number of air holes having a hole diameter of 0.5 to 2.5 mm are scattered and formed on the entire surface of the laminate, and the total area of the air holes is 2.5 to 12.5 per unit area of the laminate. It is preferable that the thermoplastic resin layer contains 1.5 to 10% by mass of thermally expandable particles with respect to the thermoplastic resin layer. As a result, a sound-absorbing and non-combustible sheet that is excellent in reverberation suppressing effect and sound attenuation effect, is lightweight and flexible, and has non-combustible properties applicable to the Building Standard Act property when used as a ceiling membrane. Can do.

  In the sound-absorbing non-combustible sheet of the present invention, the thermally expandable particles are preferably one or more layered silicate compounds selected from smectite clay minerals, synthetic smectites, sericites, and fluorine mica. When the thermoplastic resin layer contains these layered silicate compounds as thermally expandable particles, when the sound-absorbing incombustible sheet of the present invention is heated by a fire, the layered silicate compound is apparently thermoplastic due to volume expansion. The resin layer itself expands in volume, thereby closing the ventilation holes of the sound-absorbing non-combustible sheet, thereby satisfying the non-combustible requirements applicable to the Building Standard Act property.

In the sound-absorbing non-combustible sheet of the present invention, when the laminate is irradiated with radiant heat of 50 kW / m ² by a cone calorimeter test (ASTM-E1354), the thermoplastic resin layer expands due to the volume expansion of the thermally expandable particles. It is preferable to close the vent hole. As a result, when the sound-absorbing incombustible sheet of the present invention is heated by a fire, the thermoplastic resin layer is expanded by the volume expansion of the thermally expandable particles to close the vent hole, and as a result, the opening ratio is 1%. By making it less than this, the non-combustible requirements applicable to the Building Standard Act property can be satisfied.

  In the sound-absorbing non-combustible sheet of the present invention, the multifilament yarn is preferably a yarn containing at least one selected from glass fiber, silica fiber, alumina fiber, silica-alumina fiber, basalt fiber, and carbon fiber. As a result, the fiber fabric constituting the sound-absorbing and non-combustible sheet of the present invention acts as a ventilation diffusion layer, exhibits a sound-absorbing effect, and at the same time satisfies the non-combustible requirements applicable to the Building Standard Act property.

  In the sound-absorbing incombustible sheet of the present invention, the multifilament yarn is preferably a bulky yarn. As a result, the fiber fabric constituting the sound-absorbing incombustible sheet of the present invention acts as a ventilation diffusion layer, and a better echo suppression effect and sound attenuation effect can be obtained.

The sound-absorbing non-combustible sheet of the present invention is adhered to the fiber fabric by one or more kinds of thermally expandable materials selected from smectite clay mineral, synthetic smectite, sericite, fluoromica, and water glass (sodium silicate aqueous solution). It is preferable that when the laminate is irradiated with radiant heat of 50 kW / m ² by a cone calorimeter test (ASTM-E1354), the vent hole of the fiber fabric is closed by the volume expansion of the thermally expandable particles. . By containing these thermally expandable particles in the fiber fabric, when the sound-absorbing non-combustible sheet of the present invention is heated by a fire, the ventilation holes of the fiber fabric portion are supplementarily closed by the volume expansion of the thermally expandable particles. Can effectively meet the non-combustibility requirements applicable to Building Standard Act properties.

In the sound-absorbing incombustible sheet of the present invention, it is preferable that a bubble-containing resin breathable coating layer having a thickness of 1 to 5 mm and a density of 0.35 to 0.75 g / cm ³ is formed on one surface of the laminate. As a result, it is possible to obtain a sound-absorbing incombustible sheet that is more excellent in echo suppression effect and acoustic attenuation effect.

The sound-absorbing non-combustible sheet of the present invention has a maximum calorific value of 20 MJ / m ² or less for 20 minutes after the start of irradiation with radiant heat of 50 kW / m ^{2 in} the cone calorimeter test (ASTM-E1354), and the highest for 20 minutes after the start of irradiation. It is preferable that the heat generation rate has a combustion characteristic that does not exceed 200 kW / m ² continuously for 10 seconds or more. As a result, the non-combustible requirements applicable to the Building Standard Act property can be satisfied.

  According to the present invention, a non-combustible interior material having a sound absorbing property as a ceiling area constituting member and a sound absorbing member installed on a ceiling of a building or an accessory to a ceiling area constituting member can be obtained. It has light weight and flexibility that are unlikely to cause serious human damage even if it collapses, but it has excellent echo suppression and sound attenuation effects, so it can be used in indoor stadiums, gymnasiums, indoor pools, and event halls. It can be widely used for building membrane ceilings in public halls, ceremonial occasions, station building lobbies, airport lobbies and shopping mall atriums.

The figure which shows typically an example of the cross section of the sound-absorbing incombustible sheet of this invention The figure which shows typically an example of the cross section of the sound-absorbing incombustible sheet of this invention The figure which shows typically an example of the external appearance of the sound-absorbing incombustible sheet of this invention

The sound-absorbing non-combustible sheet of the present invention includes a laminate (mass 0.3 to 2) comprising a fiber fabric formed by weaving a multifilament yarn as a ventilation diffusion layer, and coating a thermoplastic resin layer on one side of the fiber fabric. 0.0 kg), or a laminate (mass 0.4 to 2.0 kg) formed by coating a thermoplastic resin layer on both sides of the fiber fabric, and the pore diameter 0.5 to 2.5 mm on the entire surface of the laminate. Preferably, a large number (3 to 400 / perforation of staggered holes, regular alignment of corners or random) of air holes having a hole diameter of 0.75 to 1.5 mm (the form is a circular diameter, a substantially circular diameter, or an elliptical diameter). inch ² ) formed, and the total area of the ventilation holes is 2.5 to 12.5%, preferably 5.0 to 10% per unit area of the laminate, and The thermoplastic resin layer causes the thermally expandable particles to be 1.5 to 10 with respect to the thermoplastic resin layer. When the sound-absorbing non-combustible sheet of the present invention is heated by a fire (simulated by a cone calorimeter test (ASTM-E1354)) When the heat-expandable particles undergo volume expansion when irradiated with radiant heat of 50 kW / m ² ), the thermoplastic resin layer itself apparently undergoes volume expansion, and the ventilation holes of the sound-absorbing incombustible sheet are blocked. Less than 2.5%, preferably 1% or less, whereby, in the corn calorimeter test (ASTM-E1354), the total calorific value for 20 minutes after the start of irradiation with radiant heat of 50 kW / m ² is 8 MJ / m ² or less In addition, the non-flammability requirement applicable to the Building Standard Act property can be satisfied by expressing the combustion characteristics that the maximum heat generation rate continues for 10 seconds or more for 20 minutes after the start of irradiation and does not exceed 200 kW / m ² .

Ventilation hole diameter is less than 0.5φmm, and if the hole diameter exceeds 2.5φmm, the sound absorption effect such as the echo suppression effect and acoustic attenuation effect of the sheet obtained is insufficient, and when the hole diameter exceeds 2.5φmm Make the sheet non-combustible. In addition, if the open area ratio is less than 2.5%, the resulting sheet may have insufficient sound absorption effects such as reverberation suppression and sound attenuation, and if it exceeds 12.5%, the non-flammability of the obtained sheet may be reduced. May be insufficient. Specifically, when the hole diameter of the vent hole is 0.5 mm, for example, the minimum number of holes 90 (vertical row 9 x horizontal row 10) pieces / inch ² , the minimum opening ratio 2.73% to the maximum porosity number 400 (vertical row 20 X Horizontal row 20) A range of pieces / inch ² and a maximum opening rate of 12.15% is preferable. In the case of a hole diameter of 2.5 mm, for example, the minimum number of holes is 4 pieces / inch ² and the opening rate is 3. The range of 04% to the maximum number of pores 16 (vertical row 4 × horizontal row 4) / inch ² and an open area ratio of 12.17% is preferable. Further, a ventilation hole having a pore diameter of 0.5φmm and a ventilation hole having a pore diameter of 2.5φmm The combined use may be a combined use of vent holes with a hole diameter of 0.5 mm, 1.5 mm, and 2.5 mm. The laminated body provided with the ventilation holes in this way works as a resonance hole as a resonance hole, and at the same time, as an example of a tomographic structure of the resonance hole, “thermoplastic resin layer / fiber fabric (ventilation diffusion layer)” By adopting the “/ thermoplastic resin layer”, the sound wave incident on the vent is propagated to the inside of the fiber fabric (the vent diffusion layer), and is further ventilated continuously with the adjacent vent, thereby increasing the acoustic attenuation effect. And Satisfying the air permeability (JIS L1096: Fragil method) 1 to 50 cc / cm ² / sec is excellent in the echo suppression effect and the sound attenuation effect, and is preferable. If the air permeability is less than 1 cc / cm ² / second, the echo suppression effect may be deteriorated, and if it exceeds 50 cc / cm ² / second, the sound absorption effect may be deteriorated.

  If these vent holes penetrate at least the thermoplastic resin layer, the fiber fabric itself is breathable even if it is non-penetrating to the fiber fabric as the vent diffusion layer. No problem. In such an embodiment, a film obtained by subjecting a thermoplastic resin film to be a thermoplastic resin layer in advance to (sheath) needle piercing, mechanical stenosis processing by a punch, and stenosis processing by a carbon dioxide laser is used as a fiber fabric. It is obtained by laminating. In addition, after laminating the film on the fiber fabric, a semi-penetrating mechanical (thermal) needle squeezing process is performed, and a process in which a stenosis process is performed with a carbon dioxide laser with the drilling depth controlled. . Also, after laminating the film on the fiber fabric and after forming the bubble-containing resin breathable coating layer, it has been subjected to mechanical (thermal) needle piercing, punch stenosis processing, etc., by carbon dioxide laser Even if a part of the multifilament of the fiber fabric is physically frayed back and completely closes through the small-diameter through hole after the complete penetration, the present invention is applied. This does not impair the sound absorbing effect of the sound absorbing non-combustible sheet.

  The fiber type of the fiber fabric (ventilation diffusion layer) used for the sound-absorbing incombustible sheet of the present invention includes one or more inorganic fibers selected from glass fiber, silica fiber, alumina fiber, silica-alumina fiber, basalt fiber, and carbon fiber. Yarn is preferred for the purpose of imparting nonflammability. Aramid fiber (polyparaphenylene terephthalamide fiber, polyparabenzamide fiber, paraphenyleneoxydiphenylene terephthalamide copolymer fiber is used for higher flame retardancy and higher heat resistance, although it is not incombustible. All aromatic polyamide fibers), polyarylate fibers, polybenzoxazole fibers, polybenzimidazole fibers, polybenzothiazole fibers and polyetheretherketone fibers can be used. These may be used by blending or weaving with the aforementioned inorganic fibers. Incombustible cellulose spun yarn obtained by subjecting hydroxyl groups of cellulose fibers such as cotton to chemical modification treatment such as boric acid esterification, phosphoric acid esterification and silicic acid esterification is preferable as a bulky yarn containing a large amount of air. Furthermore, the multifilament (bulky) yarns constituting the above fiber fabric are supplementarily supplemented with low melting polymer filament components such as polypropylene fibers, polyethylene fibers, polyester fibers (PET, PBT, PNT), nylon fibers, and vinylon fibers. When mixed, this can be used as a hot melt binder component, and in particular, the bulk ratio of the multifilament bulky yarn can be fixed and held in a stable state.

  The woven structure of the fiber fabric (ventilation diffusion layer) used for the sound-absorbing incombustible sheet of the present invention is a plain fabric (minimum constituent unit using at least two warps and wefts), twill fabric (minimum of three warps and wefts) Minimum composition unit: 3 slashes, 4 slashes, 5 slashes, 6 slashes, 8 slashes, etc., satin fabric (minimum composition unit using at least 5 warps and wefts): 2 Flying, 3 jumping, 4 jumping, 5 jumping, etc., regular Ako), change flat fabric (slanting weave: Nanako, fish, Namiko, basket weaving, Panama weaving), (weaving weaving: silk weaving, rib weaving), change Aya fabric (steep, gentle, Yamagata, broken, curved, cedar, ornament, day / night, and jump), change satin fabric (irregular vermilion, double vermilion, spread) Akuko, day and night vermillion), mojiri fabric (mock woven fabric, cocoon fabric), triaxial fabric (oblique fabric: Nanako, fish, Namiko, basket weave, Panama) ), The four-axis fabric (Nanako weave: Nanako, Sakanako, Namiko, weave baskets, Panama weave) etc. can be optionally used.

The yarn elements constituting the fiber fabric (ventilation diffusion layer) include glass fibers (E glass, C glass, G glass, A glass, S glass, D glass, DE glass), silica fiber “silica (SiO _2). ) And 95% by mass or more of the main component, and 2.5 to 5% by mass of boron oxide (B ₂ O ₃ ) as an auxiliary component, and 65 to 75% by mass of alumina fiber “alumina (Al ₂ O ₃ )” The main component is 25 to 35% by mass of silica (SiO ₂ ), and the secondary component contains 2.5 to 10% by mass of boron oxide (B ₂ O ₃ ) ”, silica alumina fiber, basalt fiber, carbon fiber, etc. Filament yarn is suitable for non-combustible sheet, filament diameter is 1-10 μm, filament single yarn 0.1-10 denier, multifilament fineness 69-2223 dtex (62-2000 denier), especially 138 to 1112 dtex (124 to 1000 denier) multifilament, 50 to 500 filaments, especially 100 to 300 bundles, 10 to 40 times / m weakly twisted yarn, or 41 to 200 times / m ordinary twisted yarn Yarns having a circular, elliptical, or flat cross-sectional shape are excellent in air diffusibility, and if these are bulky yarns, they are more excellent in air diffusibility and thereby exhibit effective sound absorption.

  Examples of the bulky yarn include air-processed yarn (taslan-processed yarn, interlace-processed yarn, air-spun yarn, etc.) or Woolley-processed yarn. More specifically, during the production of multifilament yarns, filament loosening (defibration) is performed by air jet entanglement with a Taslan nozzle, forcing loosening and entanglement in a turbulent vortex. It is preferable to use a taslan-processed yarn that is bulked by forming a large number of loops, spiral coils, and knots. It may be a core yarn form in which a multifilament core yarn is opened and a multifilament sheath yarn is opened three-dimensionally to form many loose entanglements. In addition, as a bulky multifilament yarn, heat-set in a state where a multifilament yarn made of synthetic fiber is twisted (false twist or alternating false twist), and then crimped to obtain a crimped wooly processed yarn ( False twisted or false false twisted yarn). These taslan yarn and wooly yarn use two or more types of feed yarns, and the bulkiness can be controlled arbitrarily by controlling the feed yarn characteristics (different fineness, irregular shape, different shrinkage, different crimp) and feed rate. Can do. In the present invention, the bulky yarn is particularly preferably a Taslan processed yarn. In addition, the bulky yarn is a Taslan mixed twisted yarn (twisted yarn) obtained by bundling one bulky yarn and one non-bulky multifilament yarn (general-purpose multifilament yarn) and applying 10 to 100 turns / m. It may be a Taslan plied yarn (triple twisted yarn) obtained by bundling two bulky yarns and one non-bulky multifilament yarn (general-purpose multifilament yarn) and applying a twist of 10 to 100 times / m.

The above-mentioned fiber fabric (breathing diffusion layer) is a woven fabric, warp and bias having a mass of 100 to 300 g / m ² obtained by driving 18 to 46 multifilament (bulky) yarns as warps and wefts for 1 inch each. A triaxial woven fabric having a mass of 125 to 350 g / m ² obtained by driving 16 to 42 yarns per inch as a yarn, a warp yarn, a weft yarn, and a bias yarn of 16 to 42 yarns obtained per inch each of a mass of 150 to A 400 g / m ² four-axis woven fabric with a void porosity of 0 to 5% is excellent in nonflammability. When the void ratio exceeds 5%, the combustion gas easily leaks from the texture of the fabric in the event of a fire, which may result in incompatibility with the Building Standard Act property. The bulky yarn is a plain woven fabric, twill woven fabric, satin woven fabric, double woven fabric, triple woven fabric, etc. used for both the warp and weft forming the fiber fabric in terms of improving the sound absorption of the sound-absorbing and non-combustible sheet of the present invention. Preferably, it may be a plain woven fabric, a twill woven fabric, a satin woven fabric, or a multi-woven fabric such as a double woven fabric or a triple woven fabric in which only one of the warp yarn or the weft yarn is constituted by a bulky yarn. Further, in the triaxial bulky woven fabric, it is suitable for the purpose of improving the sound absorbing property of the sound-absorbing incombustible sheet of the present invention that the bulky yarn is used for at least one of the warp yarn and the bias yarn. The use of a bulky yarn for at least one of the weft yarn and the bias yarn is suitable for the purpose of improving the sound absorption of the sound-absorbing incombustible sheet of the present invention. These bulky woven fabrics have air diffusibility that contains 5 to 20% (0.05 to 0.2 cc / cm ³ ) of air per unit volume (apparent volume) in order to improve the sound absorption of the sound-absorbing and non-combustible sheet of the present invention. preferable. The air content can be obtained as the occupancy of the total volume of bubbles with respect to a specific volume (for example, 1 cm ³ ) by collecting bubbles that rise when a bulky fabric of a specific volume (for example, 1 cm ³ ) is submerged in water by the water displacement method. it can.

  The thermoplastic resin layer covering the fiber fabric mainly contains a thermoplastic resin and flame retardant particles, and exhibits a soundproof attenuation effect when the specific gravity of the thermoplastic resin layer is 1.3 or more and 2.5 or less. . The thermoplastic resin component used in the thermoplastic resin layer is soft vinyl chloride resin (as plasticizer, dialkyl esters of adipic acid, dialkyl esters of sebacic acid, dialkyl esters of phthalic acid, dialkyl esters of isophthalic acid, dialkyl esters of terephthalic acid) , Cyclohexanedicarboxylic acid dialkyl esters, aromatic phosphate esters, chlorinated paraffins, polyester oligomers, etc., in an amount of 30 to 100 parts by mass based on 100 parts by mass of the vinyl chloride resin), vinyl chloride copolymer Resin (including vinyl chloride resin homopolymer of vinyl chloride monomer, copolymer with other monomers copolymerizable with vinyl chloride monomer, and graft polymer), olefin resin, olefin copolymer Polymer resin, urethane resin, urethane co-polymer Resin, acrylic resin, acrylic copolymer resin, vinyl acetate resin, vinyl acetate copolymer resin, styrene resin, styrene copolymer resin, polyester resin, and polyester copolymer resin, fluorine resin, fluorine Examples thereof include a copolymer resin and a silicone resin.

The thermoplastic resin layer preferably contains thermally expandable particles in an amount of 1.5 to 10% by mass, particularly 2.5 to 7.5% by mass with respect to the thermoplastic resin layer. When the content of the heat-expandable particles is less than 1.5% by mass, the sound-absorbing non-combustible sheet of the present invention is 50 kW in the laminate when heated by a fire (simulated by a cone calorimeter test (ASTM-E1354)). / M ² of radiant heat), the expansion effect of the thermoplastic resin layer due to the volume expansion of the heat-expandable particles becomes insufficient, and as a result, the blockage of the air holes becomes incomplete (the opening ratio is 1). May not be applicable to Building Standard Act properties. In addition, if the content of the thermally expandable particles exceeds 10% by mass, the volume expansion of the thermoplastic resin layer becomes excessive, and it becomes easy to form an expansion strain crack that is continuous with the air vents, so that it can be applied to a Building Standard Act property. It may disappear.

  Specifically, the heat-expandable particles use one or more layered silicate compounds selected from smectite clay minerals, synthetic smectites, sericites, and fluorine mica, and particularly smectite clay minerals have an average particle size of 1 to 1. A 30-micrometer thing and a synthetic smectite with an average particle diameter of 0.01-3 micrometers are preferable. The smectite clay mineral is 2: 1 type smectite, and a layer composed of silicon and oxygen (silica tetrahedral layer) sandwiches a layer composed of aluminum and oxygen (aluminum octahedral layer), “silica tetrahedral layer / The “aluminum octahedral layer / silica tetrahedral layer” structure layer is a unit, and the structure layers are stacked. Further, the aluminum octahedron layer is classified into two octahedron type and three octahedron type, and specific examples of the two octahedron type smectite include montmorillonite, beidellite, nontronite, etc., as specific examples of the trioctahedral type smectite, Examples include saponite, hectorite, soconite, and stevensite. In the present invention, the layered silicate compound can also use clay minerals such as talc, pyrophyllite, vermiculite, kaolinite, dickite, halloysite, mica, chlorite and serpentine, and can be used in combination with the above smectite. The appearance color of the incombustible sheet obtained by accompanying coloring derived from minerals may become cloudy in light earth or greenish gray. Synthetic smectite is a non-combustible sheet that has a structure in which silica tetrahedral (tetracoordinate) layers and aluminum octahedral (hexacoordinate) layers are stacked alternately, and the use of a mass ratio of silica / aluminum of 2: 1 is obtained. It is preferable that the appearance color is not clouded. Sericite (sericite) is fine muscovite and has an average particle diameter of 1 to 20 μm. Further, the fluorine mica does not turbidize the appearance color of the incombustible sheet obtained by using fluorine tetrasilicon mica having an average particle diameter of 1 to 20 μm obtained by organic exchange treatment of Na tetrasilicon mica. Moreover, since the layered silicate compound used in the present invention contains exchangeable cations such as sodium ions and calcium ions between layers, other metal ions, cationic compounds, anionic compounds, Intercalation-type layered silicate compounds that have been incorporated by reactive reactions (silane coupling agents) and chemically modified or chemically modified can be used, especially those that are hydrophilic or lipophilic Is effective for improving the dispersibility of the coating composition for forming the anchor layer and controlling the rheology, and those substituted with halogen such as Cl, Br, and F are preferred from the viewpoint of improving the nonflammability. In particular, smectite clay minerals (montmorillonite and the like) are preferably those which are substituted and modified with quaternary phosphonium compounds or quaternary ammonium compounds such as dimethylstearylammonium chloride and benzyldimethylstearylammonium chloride between the layers.

In the thermoplastic resin layer containing these thermally expandable particles (layered silicate compound), a silane coupling agent is used for the purpose of stabilizing the volume expansion of the thermoplastic resin layer accompanying the volume expansion of the thermally expandable particles. It is preferably used in an amount of 1 to 20% by mass, particularly 3 to 10% by mass, based on the total amount of thermally expandable particles (layered silicate compound). The silane coupling agent is a compound having two or more different reactive groups in the molecule represented by the general formula: XR-Si (Y) ₃ , for example, X = amino group, vinyl group, epoxy group, A chloro group, a mercapto group, etc. (R = alkyl chain), Y = methoxy group, ethoxy group, etc. In the silane coupling agent contained in the thermoplastic resin layer, the reaction component at the end reacts with the surface of the thermally expandable particles (layered silicate compound) and / or intercalates between the layers of thermally expandable particles (layered silicate compound). The reaction component at the other end reacts with a part of the molecular chain structure of the thermoplastic resin at the same time, making it difficult for expansion strain cracks to occur even when the thermoplastic resin layer expands in volume. A strong expansion body can be formed.

In order to effectively satisfy the non-combustible requirements applicable to the Building Standard Act property, the sound absorbing non-combustible sheet of the present invention is applied to the fiber fabric (ventilated diffusion layer) described in the paragraphs [0019] to [0023]. Using one or more thermally expandable materials selected from smectite-based clay minerals, synthetic smectites, sericite, fluoromica, and water glass (sodium silicate aqueous solution) described in paragraph [0027]. When the emulsion resin binder treatment is performed in combination with a silane coupling agent and the sound-absorbing non-combustible sheet of the present invention is heated by a fire (simulatedly by a cone calorimeter test (ASTM-E1354), 50 kW / when irradiated with radiation heat of m ^2), the thermal expandable particles adhering to the fiber fabric is fiber fabric layer itself volume expansion by causing volume expansion, the fiber fabric portions It is possible to obtain a sound-absorbing non-combustible sheet having a building codes properties applicable nonflammable by the auxiliary function of closing the pores. Specifically, acrylic resin emulsion, urethane resin emulsion, ethylene vinyl acetate copolymer emulsion, etc. are used as a binder base, and the above-mentioned thermally expandable particles are contained in the above-mentioned thermally expandable particles in a solid content of 10 to 50% by mass with respect to the binder resin. A silane coupling agent is blended in an amount of 1 to 5% by mass with respect to the amount, and a curing agent such as an isocyanate compound, an oxazoline compound, or an epoxy compound can be used in combination as necessary. As for the adhesion amount of the said thermally expansible particle with respect to a fiber fabric, 1-10 mass% is preferable.

  The flame retardant particles used in the thermoplastic resin layer are a). Phosphorus atom-containing compounds such as metal phosphates, metal organophosphates, phosphate derivatives (phosphate ester compounds, phosphonate ester compounds), ammonium polyphosphate, and ammonium polyphosphate derivative compounds, b). Nitrogen-containing compounds (melamine cyanurate) such as (iso) cyanurate compounds, (iso) cyanuric acid compounds, guanidine compounds, urea compounds, and derivative compounds thereof, c). Inorganic compounds such as silicon compounds, metal hydroxides, metal oxides, metal carbonate compounds, metal sulfate compounds, boric acid compounds, and inorganic compound complexes; d). Particularly preferred flame retardant particles are lead oxide (specific gravity 9.35), antimony trioxide (specific gravity 5.7), barium titanate (specific gravity 5.6), oxidation, and the like. Zirconium (specific gravity 5.5), zinc oxide (specific gravity 5.4), iron oxide (specific gravity 5.2), barium carbonate (specific gravity 4.4), barium sulfate (specific gravity 4.4), titanium dioxide (specific gravity 4. 0), alumina (specific gravity 3.8), potassium titanate (specific gravity 3.3), magnesium oxide (specific gravity 3.3), mica (specific gravity 3.0), talc (specific gravity 2.8), calcium carbonate (specific gravity) 2.6), aluminum hydroxide (specific gravity 2.4), magnesium hydroxide (specific gravity 2.4), etc., and the specific gravity of the thermoplastic resin flame retardant layer is 1.3 or more and specific gravity 2.5 or less. To do. If the specific gravity exceeds 2.5, the sound-absorbing non-combustible sheet that is obtained exceeds the mass, which increases the possibility of serious human damage when the ceiling material collapses. On the other hand, if the specific gravity is less than 1.3, the nonflammability and the soundproof attenuation effect may be insufficient.

The thickness of the thermoplastic resin layer is preferably 0.1 mm to 0.5 mm, particularly 0.12 mm to 0.25 mm, and a mass of 150 to 750 g / m ² per layer. Particularly preferred thermoplastic resin layers for the present invention include vinyl chloride resins (including soft to semi-rigid vinyl chloride resins containing plasticizers, stabilizers, flame retardants, etc.), styrene copolymer resins (flame retardants, etc.). Compounding), urethane-based copolymer resins (comprising flame retardants, etc.), and polyester-based copolymer resins (comprising flame retardants). These thermoplastic resin layers can be 0.1 mm to 0.5 mm film or sheet by calender molding or T-die extrusion molding, and pigments, glitter pigments, phosphorescent pigments, heat-shielding pigments, light diffusion beads as required , UV absorbers, light stabilizers, antifungal agents, antibacterial agents, insect repellents, antistatic agents, deodorants, fragrances and the like can be added in any amount.

In the sound-absorbing non-combustible sheet of the present invention, a bubble-containing resin breathable coating layer having a thickness of 1 to 5 mm and a density of 0.35 to 0.75 g / cm ³ may be formed on one side. Sound absorption can be further improved by forming the bubble-containing resin breathable coating layer. The sound-absorbing incombustible sheet is a laminate in which a thermoplastic resin layer is formed on only one side of a fiber fabric, or a laminate in which a thermoplastic resin layer is formed on both sides of a fiber fabric. The surface on which the conductive coating layer is formed is the exposed fiber fabric surface side, and the latter may be on either the front or back surface side. The bubble-containing resin breathable coating layer has a gas permeability (JIS L1096: Frazier method) of 0.1 to 10 cc / cm formed to a density of 0.35 to 0.75 g / cm ³ by coating to solidification treatment of the foam-like composition. It is preferable as an incidental layer for improving the echo attenuation effect that it has ² / sec and has further air permeability by being continuous with a part of the air hole of the sound-absorbing incombustible sheet body. After forming the gas-containing resin breathable coating layer, complete penetration (piercing), punching, or carbon dioxide laser penetration is performed. It may be the formation of pores. In addition to using the flame retardant particles described in paragraph [0029] in order to obtain non-flammability in the bubble-containing resin breathable coating layer, when the sound-absorbing non-flammable sheet of the present invention is heated by a fire (simulated In the corn calorimeter test (ASTM-E1354), when the radiant heat of 50 kW / m ² was applied to the laminate, the thermally expandable particles seemed to cause volume expansion, which seemed to cause the volume expansion of the gas-containing resin breathable coating layer itself. By closing the ventilation holes of the sound-absorbing non-combustible sheet, the open area ratio is less than 2.5%, preferably 1% or less, thereby making it easy to meet the non-combustible requirements applicable to the Building Standard Act property. . For example, a soft vinyl chloride resin paste sol containing a plasticizer is used as the foam composition, and a viscous sol composition containing 1 to 5 parts by mass of silicone oil as a foam stabilizer is added to the stirrer (stainless steel or metal). Use a whip that is mechanically agitated by a combination of several blades in a bowl shape and forcibly entrained bubbles.

In addition, the bubble-containing resin breathable coating layer is coated with a chemical foaming agent-containing composition, pyrolyzes the chemical foaming agent by heating at 180 to 220 ° C., contains bubbles generated as gas generation traces, and has a thickness. It may be a coating layer having an air permeability (JIS L1096: Frazier method) of 0.1 to 10 cc / cm ² / sec formed at 1 to 5 mm and a density of 0.35 to 0.75 g / cm ³ . The chemical foaming agent-containing composition is composed of a soft vinyl chloride resin paste sol containing a plasticizer as a chemical foaming agent. A thick paste sol composition containing 1 to 10 parts by mass of one or more selected from isobutyronitrile or the like is knife coated, and the chemical blowing agent is pyrolyzed and gasified by heating at 180 to 220 ° C. Bubbles generated as generation marks are included in the bubble-containing resin breathable coating layer and the impregnation part, and the thickness of the bubble-containing resin breathable coating layer is 1 to 5 mm and the density is 0.35 to 0.75 g / cm ³ . The bubble-containing resin breathable coating layer is heat melt laminated at 150 to 175 ° C. as a film obtained by calendering a composition containing 1 to 10 parts by mass of the chemical foaming agent on a thermoplastic resin, and heated at 180 to 220 ° C. The foaming agent may be pyrolyzed and gasified to contain bubbles generated as gas generation traces, and may have a thickness of 1 to 5 mm and a density of 0.35 to 0.75 g / cm ³ . The formation of the air hole is formed by performing a completely penetrating mechanical (thermal) needle hole processing after the formation of the bubble-containing resin breathable coating layer, or by performing a full hole narrow hole processing by a carbon dioxide laser. .

  The construction of the sound-absorbing incombustible sheet according to the present invention is performed by combining any arbitrary standard sheet having a width of 1 m to 3 m and an arbitrary standard sheet having a length of 1 m to 50 m, and using the air vent forming surface side as an acoustic incident surface. Especially 1). The sound-absorbing non-combustible sheets, each of which has a width of about 1m to 3m and a length of about 1m to 5m, are panels in which the entire circumference of the sound-absorbing non-combustible sheet is fixed with an aluminum frame (pressing material) in the form of a rectangle, rectangle, triangle, rhombus, etc. It can be used for flat ceilings and geometric 3D ceilings by fixing to the ceiling beam system or by hanging 2). In addition, a long sound-absorbing incombustible sheet with a width of about 1m to 3m and a length of about 1m to 10m is fixed to the ceiling beam or aluminum pressing member on two sides in the width direction, and without applying tension, the long sound-absorbing incombustible sheet It can be used for design art ceilings that are suspended in a semicircular arc state that is loosened by its own weight and expresses a sequence of semicircular arcs by connecting a number of long sound-absorbing incombustible sheets 3). In addition, a sound-absorbing non-combustible sheet of 1 m to 3 m in width and 1 m to 5 m in length is in the form of a square, rectangle, triangle, rhombus, etc. It can be used for design art ceilings that use drapes obtained by controlling tension by providing suspension nuts to the ceiling beam system using ropes and springs.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these. First, a method for producing and evaluating a sound-absorbing incombustible sheet according to the present invention will be described.
<Sound absorption rate>
An arithmetic average value of each sound absorption coefficient of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz was determined from Noise Reduction Coefficient (NRC value) according to JIS A1409 (reverberation reflection method).
<Air permeability>
JIS L1096 8.27.1 Determined by the Frazier method defined in the A method.
<Nonflammable test> (ASTM-E1354: Corn calorimeter test method)
The surface of the film material was irradiated with 50 kW / m ² of radiant heat from a radiant electric heater for 20 minutes. In this exothermic test, the total heat generation amount and the heat generation rate for 20 minutes were measured, and the appearance of the film material after the test was observed.
(A) Total calorific value: 8 MJ / m ² or less was regarded as suitable.
(B) heating speed: 10 seconds or more continuously to the Relevant not exceed 200 kW / ^{m 2.}
(C) Appearance observation: Applicable to those with no pinhole depression exceeding 0.5 mm in diameter.

[Example 1]
<Fiber fabric 1>
Made of alkali-free glass fiber (400 number of 9 μm filaments), 75 bulky (Taslan) yarns with twirling / m Z twisted in a state where the filaments are loosely entangled (687 dtex) single yarn with warp group and weft group The warp group was 28 woven structures per inch, and the weft group was a fiber fabric 1 (bulky plain woven fabric) having 30 woven structures per inch. The mass of the fiber fabric 1 was 320 g / m ² , the void ratio was 0.5%, and the air content was 16%.
<Laminated body>
A soft vinyl chloride resin composition of the following formulation 1 was hot melt kneaded with two rolls at 175 ° C. and passed through an inverted L-type calendar roll set at 180 ° C. to obtain a rolled film having a thickness of 0.15 mm. This film was used as a thermoplastic resin layer and heat laminated at 175 ° C. on both sides of the fiber fabric 1 to obtain a laminate sheet. This laminated sheet has mechanically squeezed holes (hole diameter 1.0 mm, hole number 64 (vertical row 8 × horizontal row 8 equally spaced)) / inch ² , opening rate 7 79%) to obtain a laminate sheet having a mass of 806 g / m ² , an air permeability of 16 cc / cm ² / sec, and an NRC value of 0.66 by a reverberation reflection method.
[Formulation 1] Soft vinyl chloride resin composition (specific gravity 1.56)
Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 55 parts by mass * Product name: Hexamol DINCH (manufactured by BASF)
Epoxidized soybean oil (stabilizer) 5 parts by mass Barium / zinc composite compound (stabilizer) 2 parts by mass Antimony trioxide (flame retardant) 20 parts by mass Thermally expandable particles (montmorillonite: average particle size 8 μm) 20 parts by mass Silicate compound particles = Smectite clay mineral Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (100% active ingredient)
Benzotriazole (UV absorber) 0.3 part by mass Titanium oxide (white pigment) 2 parts by mass

[Example 2]
Except for changing the fiber fabric 1 used in Example 1 to the following fiber fabric 2, the same as in Example 1, mechanically stenosis holes (hole diameter: 1.0 φmm, hole number: 64 (vertical row 8) lamination of × equally spaced) pieces / inch ² of horizontal rows 8, weight 828 g / ^{m 2} having a hole area ratio 7.79%), air permeability 16 cc / cm ² / sec, NRC value 0.66 by reverberation reflection method A body sheet was obtained.
<Fiber fabric 2>
The fiber fabric 1 was used, immersed in a liquid bath of a urethane emulsion solution composition of the following formulation 2, and pulled up from the liquid bath and simultaneously compressed with a mangle roll, dried in an electric heating furnace at 120 ° C. for 1 minute, and a mass of 332 g / m. ^2. A fiber fabric 2 having a void ratio of 0.5% and an air content of 13% was obtained.
[Formulation 2] Urethane resin composition Urethane resin emulsion (solid content 40% by mass) 100 parts by mass Aqueous blocked isocyanate (HDI isocyanurate trimer) 2 parts by mass Thermally expandable material (montmorillonite: average particle size 8 μm) 10 mass Part * Layered silicate compound particle = Smectite clay mineral Thermally expandable material (Water glass: JIS K1408 No.1) 3 parts by mass Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (100% active ingredient)

Example 3
The soft vinyl chloride resin composition of Formula 1 was hot-melt kneaded with two rolls at 175 ° C. and passed through an inverted L-type calendar roll set at 180 ° C. to obtain a rolled film having a thickness of 0.15 mm. This film was used as a thermoplastic resin layer to heat laminate at 175 ° C. on one side of the fiber fabric 1 to obtain a laminate sheet. A foam obtained by mechanically stirring a soft vinyl chloride resin paste sol composition having the following composition 3 was applied to the fiber fabric 1 side of this laminated sheet to a thickness of 3 mm and gelled in an electric furnace at 185 ° C. for 1 minute. subjected to, bubble containing resin breathable coating layer fiber fabric 1 surface side (density 0.33 g / cm ³⁾ to obtain a laminate sheet of the mass 788 g / ^{m 2} provided 225 g / ^{m 2.} Next, in the same manner as in Example 1, a mechanical constricted hole (hole diameter: 1.0 φmm, number of holes: 64 (vertical row 8 × horizontal row 8) arranged at equal intervals in this laminate sheet with a vent hole (completely penetrating) by a hot needle. ) pieces / inch ^2, subjected to a hole area ratio 7.79%), mass 788 g / ^{m 2,} to obtain permeability 13 cc / cm ² / sec, a laminate sheet of NRC value 0.71 by reverberation reflection method.
[Formulation 3] Soft vinyl chloride resin paste sol composition Emulsion polymerization vinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 65 parts by mass * Product name: Hexamol DINCH (BASF Corporation) Made)
Epoxidized soybean oil (stabilizer) 5 parts by mass Antimony oxide (flame retardant) 15 parts by mass Molybdenum oxide (flame retardant) 5 parts by mass Barium zinc composite compound (stabilizer) 2 parts by mass Thermally expandable particles (organically treated fluorinated mica: Average particle diameter 5 μm) 15 parts by mass * Inorganic layered compound particles = fluorine mica dimethyl silicone oil (foam stabilizer) 2 parts by mass Titanium oxide (white pigment) 2 parts by mass Isocyanurate-modified triisocyanate (TDI trimer) 3 parts by mass Part Diethylene glycol (polyol) 3 parts by weight * By adding isocyanurate-modified triisocyanate, adhesion to the fiber fabric 1 is improved, and at the same time, a polyurethane cross-linked structure is formed inside the soft vinyl chloride resin by polymerization with diethylene glycol. Resin strength and shape retention of the gas-containing resin breathable coating layer And solid.

Example 4
20 parts by mass of the thermally expandable particles (layered silicate compound particles = smectite clay mineral) used in Formulation 1 of Example 1 were mixed with 20 parts by mass of organically treated fluorinated mica (inorganic layered compound particles = fluorinated mica: average particle diameter 5 μm). Except for the change to the part, the same as in Example 1, except that the mechanical constriction hole (hole diameter: 1.0 mm, hole number: 64 (vertical row 8 × horizontal row 8 equally spaced)) / inch ² A laminate sheet having a mass ratio of 806 g / m ² , an air permeability of 16 cc / cm ² / sec, and an NRC value of 0.66 by a reverberation reflection method was obtained.

Example 5
Except for changing 20 parts by mass of thermally expandable particles (layered silicate compound particles = smectite clay mineral) used in Formulation 1 of Example 1 to 20 parts by mass of lipophilic synthetic smectite (inorganic layered compound particles = synthetic smectite). Is the same as in Example 1, mechanical constriction holes (hole diameter: 1.0 φmm, number of holes: 64 (vertical row 8 × horizontal row 8 equally spaced)) / inch ² , open area ratio 7 A laminate sheet having a mass of 806 g / m ² , an air permeability of 16 cc / cm ² / sec, and an NRC value of 0.66 by a reverberation reflection method was obtained.

Example 6
A narrow hole (hole diameter 1.0 φmm, number of holes 64 (vertical row 8 × horizontal row 8) pieces / inch ² , opening rate 7.79%) of the vent hole (completely penetrating) of Example 2 was formed. The mass was 828 g / m ² as in Example 2, except that the diameter was changed to 0.6φmm, the number of holes 196 (vertical row 14 × horizontal row 14 equally spaced) / inch ² , and the hole area ratio 8.57%. A laminate sheet having an air permeability of 13 cc / cm ² / sec and an NRC value of 0.63 by a reverberation reflection method was obtained.

Example 7
The vent holes (completely penetrating holes) of Example 3 (hole diameter 1.0 φmm, number of holes 64 (vertical row 8 × horizontal row 8 equally spaced) / inch ² , hole area ratio 7.79%) Stenosis hole 1 (hole diameter 0.6φmm, number of holes 81 (vertical row 9 × horizontal row 9 equally spaced) / inch ² ) and constriction hole 2 (hole diameter 1.5φmm, number of holes 25 (vertical row 5 × horizontal row) 5), 788 g / m ² , air permeability 24 cc / cm ² / sec, as in Example 3 except that the mixed arrangement (opening ratio 10.38%) is changed to a hybrid arrangement (pieces / inch ² ). Then, a laminate sheet having an NRC value of 0.72 by a reverberation reflection method was obtained.

Example 8
Except for changing the fiber fabric 1 used in Example 1 to the following fiber fabric 3, the same as in Example 1, with a mass of 1236 g / m ² , an air permeability of 11 cc / cm ² / sec, and an NRC value of 0.70 by the reverberation reflection method. A laminate sheet was obtained.
<Fiber fabric 3>
A group of three twisted yarns made of alkali-free glass fibers (number of 400 9μm filaments), 75 bulky (Taslan) yarns with 25 twists / m of Z twisted with the filaments entangled loosely (687 dtex) The weft group is 48 woven structures per inch, and the weft group is 42 woven structures per inch. Mass 750 g / m ² , stitch void ratio 0.5%, air content A double woven fabric with a rate of 18% was used.

Example 9
Except that the fiber fabric 1 used in Example 2 was changed to the following fiber fabric 4, the same as in Example 2, mass 718 g / m ² , air permeability 10 cc / cm ² / sec, NRC value by reverberation reflection method 0.64 A laminate sheet was obtained.
<Fiber fabric 4>
Made of carbon fiber (3,000 μm of 7 μm filaments), bulky (taslan) yarn 66tex single yarn subjected to Z twist 75 times / m with filaments entangled loosely is used for warp group and weft group. A plain woven fabric having a mass of 220 g / m ² , a void space of 0.3%, and an air content of 18% is used, with a woven structure of 12 per inch and a weft group of 12 woven structures per inch. The urethane emulsion solution composition according to Formulation 2 of Example 2 was immersed in a liquid bath, pulled up from the liquid bath and simultaneously compressed with a mangle roll, dried in an electric furnace at 120 ° C. for 1 minute, and a mass of 232 g / m ² . A fiber fabric 3 having a void ratio of 0.2% and an air content of 12% was used.

Example 10
A foam obtained by mechanically stirring the soft vinyl chloride resin paste sol composition of Formulation 3 used in Example 3 on one side of a laminate sheet intermediate (unconstricted hole) having a mass of 828 g / m ² of Example 2 It was applied to a thickness of 3 mm, and subjected to a gelation treatment for 1 minute in an electric furnace at 185 ° C., and a bubble-containing resin breathable coating layer (density 0.33 g / cm ³ ) was formed on one side of the laminate sheet intermediate (unconstricted hole). ) to obtain a laminate sheet of mass 1053 g / ^{m 2} provided 225 g / ^{m 2.} Next, in the same manner as in Example 1, a mechanical constricted hole (hole diameter: 1.0 φmm, number of holes: 64 (vertical row 8 × horizontal row 8) arranged at equal intervals in this laminate sheet with a vent hole (completely penetrating) by a hot needle. ) pieces / inch ^2, subjected to a hole area ratio 7.79%), mass 1053 g / ^{m 2,} to obtain permeability 11 cc / cm ² / sec, a laminate sheet of NRC value 0.70 by reverberation reflection method.

  Each of the laminate sheets of Examples 1 to 10 is a laminate in which a fiber fabric formed by weaving a multifilament yarn is included as a ventilation diffusion layer, and a thermoplastic resin layer is formed on at least one surface of the fiber fabric. By using a bulky yarn of multifilament yarns such as glass fiber and carbon fiber, the fiber fabric acts as a ventilation diffusion layer. In particular, the entire surface of these laminate sheets has a pore diameter of about 0.6, 1.5 mm. The resonance attenuation effect is caused by the scattered formation of resonance holes having a pore opening ratio of 7.79%, 8.57%, and 10.38%, and further, the sound is attenuated by being diffused into the ventilation diffusion layer (fiber fabric). The synergistic effect of sound absorption was revealed. And when the laminated sheet of Examples 1-10 is heated by a fire by including a layered silicate compound such as smectite clay mineral, synthetic smectite, and fluorine mica as the thermally expandable particles in the thermoplastic resin layer. When the layered silicate compound expands in volume, the apparently thermoplastic resin layer itself expands in volume, thereby clarifying the effect of blocking smoke leakage that blocks the air holes of the laminate sheets of Examples 1 to 10. It was.

[Comparative Example 1]
A mechanical constriction hole of a vent hole (completely penetrating) by a hot needle to the laminate sheet (unconstricted hole) of Example 1 (hole diameter 0.25φ mm, number of holes 625 (vertical row 25 × horizontal row 25 equally spaced) A laminate sheet having a mass of 806 g / m ² and an air permeability of 3 cc / cm ² / sec was obtained in the same manner as in Example 1 except that the composition was changed to) / inch ² and the porosity was 4.75%. By reducing the diameter of the air hole from 1.0 mm to 0.25 mm, the sound absorption effect is inferior, and the NRC value by the reverberation reflection method is reduced from 0.66 to 0.21.

[Comparative Example 2]
A mechanically narrowed hole (completely penetrating) with a hot needle for the laminated sheet (unstenciled hole) of Example 1 (hole diameter 5.0 mm, number of holes 4 (vertical row 2 × horizontal row 2 equally spaced) ) Pieces / inch ² , open area ratio 12.1%), a laminate sheet having a mass of 806 g / m ² and an air permeability of 85 cc / cm ² / sec was obtained in the same manner as in Example 1. By increasing the diameter of the air hole from 1.0 mm to 5.0 mm, the sound absorption effect was inferior, and the NRC value by the reverberation reflection method was reduced from 0.66 to 0.11.

[Comparative Example 3]
A mechanical constricted hole of a vent hole (completely penetrating) by a hot needle with respect to the laminate sheet (unconstricted hole) of Example 1 (hole diameter: 1.0 φmm, number of holes: 9 (vertical row 3 × horizontal row 3 equally spaced) A laminate sheet having a mass of 806 g / m ² and an air permeability of ² cc / cm ² / sec was obtained in the same manner as in Example 1 except that the composition was changed to) / inch ² and a hole area ratio of 1.09%. By reducing the aperture ratio of the ventilation holes from 7.79% to 1.09%, the sound absorption effect was inferior, and the NRC value by the reverberation reflection method was reduced from 0.66 to 0.12.

[Comparative Example 4]
A mechanical constriction hole of a ventilation hole (completely penetrating) by a hot needle with respect to the laminate sheet (unconstricted hole) of Example 1 (hole diameter of 1.0 mm, number of holes 210 (vertical row 14 × horizontal row 15 equally spaced) A laminate sheet having a mass of 806 g / m ² and an air permeability of 32 cc / cm ² / sec was obtained in the same manner as in Example 1 except that the composition was changed to) / inch ² and the porosity was 25.5%. The ventilation rate was increased from 7.79% to 25.55%, resulting in inferior sound absorption effect, and the NRC value by the reverberation reflection method was reduced from 0.66 to 0.14.

[Comparative Example 5]
Except omitting 20 parts by mass of thermally expandable particles (layered silicate compound particles = smectite clay mineral = montmorillonite: average particle diameter 8 μm) from Formulation 1, omitting the thermally expandable particles from the thermoplastic resin layer of Example 1. As in Example 1, a laminate sheet having a mass of 815 g / m ² and an air permeability of 16 cc / cm ² / sec was obtained. The sound absorption effect was inferior to that of the laminate sheet of Example 1, but when the radiant heat of 50 kW / m ² was applied to the laminate sheet of Comparative Example 5 by the cone calorimeter test (ASTM-E1354), Combustion gas smoke leaked from all the vents to the opposite side of the seat, and was regarded as smoke or gas harmful to evacuation, making it an unsuitable material for non-combustible building codes.

  According to the present invention, a non-combustible interior material having a sound absorbing property as a ceiling area constituting member and a sound absorbing member installed on a ceiling of a building or an accessory to a ceiling area constituting member can be obtained. It has light weight and flexibility that are unlikely to cause serious human damage even if it collapses, but it has excellent echo suppression and sound attenuation effects, so it can be used in indoor stadiums, gymnasiums, indoor pools, and event halls. It can be widely used for building membrane ceilings in public halls, ceremonial occasions, station building lobbies, airport lobbies and shopping mall atriums.

1: Laminate (Sound absorbing non-combustible sheet)
2: Fiber fabric (ventilation diffusion layer)
2-1: Multifilament yarn 3: Thermoplastic resin layer 4: Vent hole 5: Bubble-containing resin breathable coating layer 5-1: Bubble

Claims (8)

  A laminate comprising a fiber fabric formed by weaving a multifilament yarn as a ventilation diffusion layer, and a thermoplastic resin layer formed on at least one surface of the fiber fabric, and a pore diameter of 0.5 over the entire surface of the laminate. A large number of vent holes with a diameter of ˜2.5 φmm are scattered, and the total area of the vent holes has an opening ratio of 2.5 to 12.5% per unit area of the laminate, and the heat The sound-absorbing incombustible sheet, wherein the plastic resin layer contains 1.5 to 10% by mass of thermally expandable particles with respect to the thermoplastic resin layer.   The sound-absorbing incombustible sheet according to claim 1, wherein the thermally expandable particles are one or more layered silicate compounds selected from smectite clay minerals, synthetic smectites, sericites, and fluorine mica. When the laminate is irradiated with radiant heat of 50 kW / m ² by a cone calorimeter test (ASTM-E1354), the thermoplastic resin layer is expanded by the volume expansion of the thermally expandable particles to close the vent hole, Results The sound-absorbing incombustible sheet according to claim 1 or 2, wherein the hole area ratio is less than 1%.   The multifilament yarn is a yarn containing at least one selected from glass fiber, silica fiber, alumina fiber, silica alumina fiber, basalt fiber, and carbon fiber. Sound-absorbing incombustible sheet.   The sound-absorbing incombustible sheet according to claim 4, wherein the multifilament yarn is a bulky yarn. The fiber fabric is subjected to an adhesion treatment with one or more thermally expandable materials selected from smectite clay mineral, synthetic smectite, sericite, fluoromica, and water glass (sodium silicate aqueous solution), and a cone calorimeter test In any one of Claims 1-5, when the said laminated body is irradiated with 50kW / m < ² > of radiant heat by (ASTM-E1354), the ventilation hole of the said fiber cloth is obstruct | occluded by the volume expansion of the said thermally expansible particle. The sound-absorbing incombustible sheet. The sound absorbing material according to any one of claims 1 to 6, wherein a bubble-containing resin breathable coating layer having a thickness of 1 to 5 mm and a density of 0.35 to 0.75 g / cm ³ is formed on one surface of the laminate. Incombustible sheet. In the cone calorimeter test (ASTM-E1354), the total calorific value for 20 minutes after starting irradiation with 50 kW / m ² of radiant heat is 8 MJ / m ² or less, and the maximum heat generation rate continues for 10 seconds or more for 20 minutes after starting irradiation. sound absorbing incombustible sheet according to claim 1 having the combustion characteristics not exceeding 200 kW / ^{m 2} Te.