JP6450922B2 - Sound absorbing sheet for membrane ceiling - Google Patents

Description

  The present invention is an indoor stadium, gymnasium, indoor pool, event hall, public hall, ceremonial hall, station building lobby, airport lobby, shopping mall, etc. It is a sound-absorbing member as an accessory, and it can be installed easily without requiring a complicated structural design or suspension structure for construction, and it is unlikely to cause serious human damage even if it collapses due to an earthquake The present invention relates to a nonflammable sheet-like long material suitable for film ceiling construction and optical ceiling film construction, which is lightweight and has excellent effects of lighting and video projection and excellent sound reflection prevention effect.

  In Patent Document 1, as a sound absorbing structure that exhibits sound absorbing performance even in the middle / low sound range without deteriorating sound absorbing characteristics in a high frequency band, a sound absorbing base material made of a porous material or a foamed material is used. In addition, a composite is disclosed in which one or a plurality of layers are heat-sealed on a surface of the sound-absorbing base material with a hot melt material that does not inhibit airflow resistance. A composite heat-sealed with such a hot melt material is inferior in heat resistance and is not suitable for a structural member of a building structure such as a membrane ceiling. In Patent Document 2, as a soundproofing material having sound absorption and sound insulation properties, a sound insulation layer made of a nonwoven fabric or an open cell foam impregnated with an elastic mortar made of a hydraulic inorganic composition and a polymer admixture, and non-impregnated with an elastic mortar A soundproofing material comprising two layers of a non-woven fabric or a sound absorbing layer made of open-cell foam is disclosed. This soundproofing material can be designed to satisfy flame retardancy and nonflammability, but by using cement in the mortar, the soundproofing material itself is heavy, hard, and light impervious. It is unsuitable for the material used to construct the membrane ceiling, and earthquake countermeasure construction becomes large and difficult. In Patent Document 3, as a sound-absorbing material for an automobile engine room having heat resistance, flame retardancy, and quick-drying property, a glass nonwoven fabric is used as a base material, and a nonwoven fabric made of heat-resistant organic fibers such as aramid fibers is laminated as a skin material. However, a non-woven fabric layer made of colored organic fibers such as aramid fibers is not necessary as a constituent member of the membrane ceiling because it impedes light transmittance. Therefore, it is a sound absorbing member as a ceiling area constituting member and sound absorbing member installed on the ceiling of a large building or an accessory to the ceiling area constituting member, both of which do not require complicated structural design and suspension structure for construction. Membrane ceiling construction that can be installed, has lightness that is unlikely to cause serious human damage even if it collapses in the event of an earthquake, and has excellent effects of lighting and video projection, and prevention of sound reflection Development of a non-combustible sheet-like long material suitable for construction of an optical ceiling membrane is desired.

JP 2008-008997 A JP 2010-025337 A JP 2014-232281 Gazette

  The present invention is a sound absorbing member as a ceiling area constituting member and a sound absorbing member installed on the ceiling of a large building or an accessory to the ceiling area constituting member, both of which require complicated structural design and suspension structure for construction. It can be installed easily, has lightness that is unlikely to cause serious human damage even if it collapses in the event of an earthquake, and is excellent in lighting and image projection effects and sound reflection prevention effects. Non-combustible sheet-like long material suitable for constructing membrane ceilings and optical ceiling membranes in stadiums, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station building lobbies, airport lobbies, shopping malls, etc. Providing is an issue.

  In order to solve the above-mentioned problems, as a laminate in which a nonwoven fabric mainly comprising glass long fibers is used as a base material, a silicone resin or a resin flame retardant layer containing a soft vinyl chloride resin is provided on one side of the nonwoven fabric, The laminated interface between the non-woven fabric and the resin flame retardant layer has an embedded portion where a part of the resin flame retardant layer has penetrated into the non-woven fabric, and further includes a fabric in the resin flame retardant layer, which makes the construction complicated. Can be installed easily without the need for a special structural design or suspension structure, and it has a light weight that is unlikely to cause serious human damage in the event of a collapse by an earthquake. As a result, the inventors have found that a nonflammable sheet-like long material excellent in sound absorption of the sound reflection preventing effect can be obtained and completed the present invention.

  That is, the sound absorbing sheet for membrane ceiling according to the present invention is a laminate in which a non-woven fabric mainly composed of long glass fibers is used as a base material and a resin flame retardant layer including a silicone resin or a soft vinyl chloride resin is provided on one side of the non-woven fabric. A non-woven fabric having a buried portion in which a part of the resin flame retardant layer has entered, and the depth of the buried portion is the non-woven fabric. It is preferable that it is 1-35% with respect to the thickness. As a result, it can be easily installed as an accessory to the ceiling area component, has a light weight that is safe even if it falls, and has excellent non-flammability with effects such as lighting and image projection and sound absorption prevention. A sheet-like long material can be obtained.

  In the sound absorbing sheet for membrane ceiling of the present invention, it is preferable that the resin flame retardant layer includes a non-combustible fabric. This makes it easy to install as a ceiling area component / sound absorbing member, has a light weight that is safe even when dropped, and also has a non-flammability that is excellent in sound absorption, such as lighting and image projection effects, and sound echo prevention effect It is possible to obtain a sheet-like long material.

  In the sound absorbing sheet for membrane ceiling of the present invention, the resin flame retardant layer contains 3 to 25% by mass of one or more selected from hollow glass beads, shirasu balloons, fly ash balloons, synthetic mica, and natural mica. Is preferred. As a result, it is possible to obtain a non-combustible sheet-like long material excellent in sound absorption such as a lighting effect and an image projection effect and a sound reflection preventing effect.

In the sound absorbing sheet for membrane ceiling of the present invention, it is preferable that the resin flame retardant layer and the buried portion are formed to a density of 0.35 to 0.75 g / cm ³ by coating with a foam-like composition. As a result, it is possible to obtain a non-flammable sheet-like long material that is excellent in sound-absorbing effects such as effects of illumination and video projection and an effect of preventing sound reflection due to air permeability.

In the sound absorbing sheet for film ceiling of the present invention, it is preferable that the resin flame retardant layer and the buried portion are formed to a density of 0.35 to 0.75 g / cm ³ by coating with a chemical foaming agent-containing composition. As a result, it is possible to obtain a non-flammable sheet-like long material that is excellent in sound-absorbing effects such as effects of illumination and video projection and an effect of preventing sound reflection due to air permeability.

  According to the present invention, a sheet-like long material is obtained as a sound absorbing member as a ceiling area constituting member and a sound absorbing member installed on the ceiling of a large building, or as an accessory to the ceiling area constituting member, and these are complicated in construction. It can be easily installed without the need for structural design or suspension structure, has lightness that is unlikely to cause serious human damage even if it collapses in the event of an earthquake, and effects by lighting and image projection, Excellent sound reflection prevention and non-combustibility, so it can be used for building indoor ceilings, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station building lobby, airport lobby, shopping malls, light It can be widely used for ceiling membrane construction.

The figure which shows typically an example of the cross section of the sound-absorbing sheet | seat for membrane ceilings of this invention The figure which shows typically an example of the cross section of the sound-absorbing sheet | seat for membrane ceilings of this invention The figure which shows typically an example of the cross section of the sound-absorbing sheet | seat for membrane ceilings of this invention The figure which shows typically an example of the cross section of the sound-absorbing sheet | seat for membrane ceilings of this invention

The sound absorbing sheet for membrane ceiling of the present invention is a sheet-like long sheet in which a nonwoven fabric mainly comprising long glass fibers is used as a base material, and a resin flame retardant layer containing a silicone resin or a soft vinyl chloride resin is provided on one side of the nonwoven fabric. Material. In the case of indoor use where the sound absorbing sheet for membrane ceiling does not require nonflammability, a polyester nonwoven fabric, a nylon nonwoven fabric, a vinylon nonwoven fabric, or the like can be used. The nonwoven fabric containing long glass fibers mainly, thickness 0.3 mm to 2 mm, the mass 30~300g / ^{m 2} of paper-like, sheet-like, yet thick 2 mm to 5 mm, a mat of Mass 300 to 800 g / ^{m 2} (Needle punch). The glass fiber used for the nonwoven fabric can be E glass, C glass, S glass, T glass, D glass, NE glass, borosilicate (SiO ₂ , B ₂ O ₃ ) glass, quartz glass, etc., and the fiber cross section is circular. Any type such as flat eyebrows and ellipses can be used. These glass fibers are used as glass long fibers or in the form of chopped strands that are bundled and cut by applying a bundling agent for producing a glass nonwoven fabric, and the number of glass fiber bundles is 100 to 1000, and the length is 3 mm to 50 mm. The fiber diameter is preferably 2 to 35 μm. A random aggregate of glass fibers is obtained by a wet papermaking method in which the glass fibers are dispersed in water to which a dispersant, a thickener and the like are added, and then paper is made and dehydrated. Spray an adhesive (unsaturated polyester resin, epoxy resin, phenol resin, urea resin, acrylic resin, polyvinyl alcohol, etc.) solution onto this random aggregate of glass fibers, or immerse it in the solution of these adhesives. Then, the binder component is adhered between the glass fibers, and this is heat-dried and solidified to obtain a nonwoven fabric. In this wet papermaking method, a non-woven fabric with a Japanese paper appearance can be obtained by using a plurality of chopped strands having different fiber diameters, and a non-woven fabric with a cloudy Japanese paper-like appearance can be obtained by using a long glass fiber bundle in combination with the chopped strands. be able to.

  The non-woven fabric used in the present invention is preferably composed of 50 to 100% by mass of glass fiber, but other inorganic fiber components such as silica fiber, alumina fiber and silica-alumina fiber are contained in a maximum of 50% by mass and chopped strands (200 fibers bundled). ˜1000, length 3 mm to 50 mm, fiber diameter 2 to 35 μm). Glass fiber chopped strands using 100% by mass of glass fiber and inorganic fibers together with chopped strands of thermoplastic resin fibers as an adhesive component for bonding and fixing the chopped strands to the nonwoven fabric are 3 to 10%. It may be used in combination with mass%, departiculate simultaneously with defibration and mixing, and then heated to a temperature equal to or higher than the melting point of the thermoplastic resin fiber and hot-melt bonded. As the thermoplastic resin fiber, a vinyl chloride resin system, a vinyl acetate resin system, an acrylic resin system, a urethane resin system, a polyolefin resin system, a polyester resin system, a polyamide resin system, and the like can be used, and these can be used in combination. The vinyl chloride resin system includes a vinyl chloride resin (containing or not containing a plasticizer), and further includes a copolymer resin obtained by copolymerization of a vinyl chloride monomer and another vinyl monomer. The same definition applies to resins. Further, a glass fiber chopped strand in which 100% by mass of glass fibers and chopped strands in combination with inorganic fibers can be used together with a long glass fiber bundle to obtain a non-woven fabric with a cloudy Japanese paper-like appearance.

  The glass nonwoven fabric is preferably accompanied by a surface treatment with a silane coupling agent in order to improve adhesion to the resin flame retardant layer. Specific examples of the silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3-amino. One or more selected from propyltrimethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane and the like In addition, organic titanate compounds can also be used.

  The sound absorbing sheet for membrane ceiling according to the present invention is a laminate in which a non-flammable material is provided with a resin flame retardant layer containing a silicone resin or a soft vinyl chloride resin on one side of a nonwoven fabric, and requires non-flammability. For other indoor applications, other known thermoplastic resins and thermoplastic elastomers such as polyolefin resins, polyurethane resins, and polyester resins can be used. As the silicone resin to be used, those having flexibility such as addition reaction curable silicone elastomer, condensation reaction curable silicone elastomer, radical (peroxide crosslinking) reaction curable silicone elastomer can be used, and particularly diluted with toluene or the like. Thus, an addition reaction curable type silicone elastomer that can be coated and can be cured at a low temperature is preferable. Addition reaction curable silicone elastomers are those in which functional groups in two types of organopolysiloxane are bonded by an addition reaction to be crosslinked and formed into an elastomer. These include, for example, aliphatic unsaturated groups such as vinyl groups and hexenyl groups. And a composition comprising an organopolysiloxane, an organohydrogenpolysiloxane, and a platinum group compound catalyst. Aliphatic unsaturated group-containing organopolysiloxanes include vinyl dimethylsiloxy group-blocked dimethylpolysiloxane at both ends, vinyldimethylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer at both ends, and vinylmethylphenylsiloxy group-blocked dimethylsiloxane at both ends. -A methylphenylsiloxane copolymer is mentioned. Examples of the organohydrogenpolysiloxane include trimethylsiloxy group-capped methylhydrogen polysiloxane at both ends, trimethylsiloxy group-capped dimethylsiloxane / methylhydrogensiloxane copolymer, dimethylhydrogensiloxy group-capped dimethylsiloxane / methylhydrol at both ends. Examples include a disiloxane copolymer and methylhydrogencyclopolysiloxane. Condensation reaction curable silicone elastomers are functional groups in two types of organopolysiloxanes, or those in which organopolysiloxanes and functional groups in silicon compounds such as silica and silane are bonded by a condensation reaction to crosslink and become elastomers. The reaction curable silicone elastomer is made into an elastomer by an organopolysiloxane, a reinforcing filler and an organic peroxide. These silicone elastomers can contain a fluorine-based resin, an extended filler, a flame retardant, an organic pigment, an inorganic pigment, an organic solvent, and the like.

  The soft vinyl chloride resin used for the resin flame retardant layer is a copolymer of vinyl chloride monomer in addition to a vinyl chloride monomer homopolymer (emulsion polymerization type, suspension polymerization type having a polymerization degree of 700 to 3800). Copolymers with other monomers that can be made, and graft polymers. Soft vinyl chloride resin contains a plasticizer, and as plasticizers, 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, dialkyl esters of cyclohexanedicarboxylic acid , Aromatic phosphate esters, chlorinated paraffins, polyester oligomers and the like containing 30 to 100 parts by weight, preferably 40 to 80 parts by weight, based on 100 parts by weight of vinyl chloride resin, and further an adhesive 1-10 parts by mass of a polyisocyanate compound alone and a two-component reaction composition of a polyisocyanate compound and a polyol compound can be blended, and in addition, a fluororesin, a flame retardant, a filler, a metal composite stabilizer, a colorant, and UV absorption Can contain agents etc. .

  The resin flame retardant layer, particularly the soft vinyl chloride resin, may contain a flame retardant, specifically the flame retardant a). Phosphorus atom-containing compounds such as metal phosphates, metal organic phosphates, phosphate derivatives, ammonium polyphosphates, 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). One or more types selected from organic bromides and organic chlorinated products, and 5 to 100 parts by mass, preferably 10 to 50 parts by mass, are used with respect to 100 parts by mass of the resin (elastomer) constituting the resin flame retardant layer. This improves the flame retardancy and non-flammability of the sound absorbing sheet for film ceilings, and at the same time brings lighting effects and projection effects by using these flame retardants instead of light diffusing agents, and also attenuates sound reflections. be able to.

Further, on the resin flame retardant layer, hollow glass beads having an average particle diameter of 10 to 50 μm, shirasu balloon, fly ash balloon (Cenosphere / Cenolite), synthetic mica (fluorine mica: KMg ₃ ALSi ₃ O ₁₀ F ₂ ), and Containing 3 to 25% by mass of one or more selected from natural mica (muscovite: KAL ₃ Si ₃ O ₁₀ (OH) ₂ ), the sound absorbing characteristic due to the echo attenuation effect of the sound absorbing sheet for membrane ceiling of the present invention It can be improved further. A part of such a resin flame retardant layer forms an embedded part (impregnated part) that penetrates into the nonwoven fabric, and the depth of the embedded part (impregnated part) is 1 to 35% with respect to the thickness of the nonwoven fabric. Therefore, the inside of the nonwoven fabric also has a structure containing substantially hollow glass beads, shirasu balloons, fly ash balloons (silica / alumina main components), synthetic mica, natural mica, etc. Improve.

In the present invention, the resin flame retardant layer includes a resin flame retardant layer and a resin having air permeability in which a buried portion as a part thereof is formed to a density of 0.35 to 0.75 g / cm ³ by coating with a foam-like composition. A flame retardant layer is preferable for obtaining a more echo attenuation effect. The foam composition uses a soft vinyl chloride resin paste sol containing a plasticizer, and a stiff sol composition containing 1 to 5 parts by mass of silicone oil as a foam stabilizer. The whip, which is mechanically agitated by attaching a blade in the shape of a tea bowl and forcibly entrained bubbles, is then directly knife coated onto the non-woven fabric to simultaneously impregnate and coat the non-woven fabric. The flame layer has a buried part (impregnated part) in which a part of the resin flame retardant layer has entered the inside of the nonwoven fabric, and the depth of the buried part (impregnated part) is 1 to 35% with respect to the thickness of the nonwoven fabric. By doing so, the sound absorption characteristic by the echo attenuation effect is further improved by forming a structure substantially containing bubbles in the nonwoven fabric. If the density of the resin flame retardant layer exceeds 0.75 g / cm ³ , the sound absorption characteristics due to the echo attenuation effect may be insufficient. If the density is less than 0.35 g / cm ³ , the wear strength of the resin flame retardant layer may be reduced. May be wrong.

In the present invention, the resin flame retardant layer is a resin flame retardant layer, and the embedded portion is a coating of a chemical foaming agent-containing composition, and the chemical foaming agent is pyrolyzed and gasified by heating at 180 to 220 ° C. A breathable resin flame retardant layer containing bubbles generated as generation marks and having a density of 0.35 to 0.75 g / cm ³ is preferable in order to obtain a more echo attenuation effect. The chemical foaming agent-containing composition uses a soft vinyl chloride resin paste sol containing a plasticizer, or a two-pack type silicone elastomer paste. As the chemical foaming agent, azodicarboxamide, oxybisbenzenesulfonyl hydrazide, benzenesulfonyl hydrazide, Impregnation into non-woven fabric by knife coating a non-woven fabric with a viscous paste composition containing 1-10 parts by mass of one or more selected from p-toluenesulfonyl hydrazide, diazoaminobenzene, azobisisobutyronitrile, etc. And the resin flame retardant layer formed by this has a buried part (impregnated part) in which a part of the resin flame retardant layer penetrates into the nonwoven fabric, and the depth of the buried part (impregnated part) The thickness is 1 to 35% with respect to the thickness of the nonwoven fabric. The chemical foaming agent is pyrolyzed and gasified by heating at 180 to 220 ° C., and bubbles generated as gas generation traces are included in the resin flame retardant layer and the buried portion (impregnation portion), and the density of the resin flame retardant layer is 0.35. ˜0.75 g / cm ³ . In addition, the resin flame retardant layer is formed by heat melting and laminating at 150 to 175 ° C. on a nonwoven fabric as a film obtained by calendering a chemical foaming agent-containing composition made of a soft vinyl chloride resin, and the chemical foaming agent is formed by heating at 180 to 220 ° C. Gas bubbles generated by pyrolysis and gas generation are included in the resin flame retardant layer and the buried portion (impregnated portion), and the density of the resin flame retardant layer is set to 0.35 to 0.75 g / cm ³ . If the density of the resin flame retardant layer exceeds 0.75 g / cm ³ , the sound absorption characteristics due to the echo attenuation effect may be insufficient. If the density is less than 0.35 g / cm ³ , the wear strength of the resin flame retardant layer may be reduced. May be wrong.

  In addition, the resin flame retardant layer is coated with a light-diffusing particle, such as a milky white to transparent, spherical or amorphous particulate inorganic compound or polymer compound having an average particle diameter of 1 to 30 μm. On the other hand, it may be contained in an amount of 0.1 to 20% by mass, preferably 1 to 10% by mass. These light diffusing particles are, for example, glass beads, glass powder, silica (silicon oxide), silicone resin beads, silicone. Resin powder, (crosslinked) acrylic resin beads, (crosslinked) acrylic resin powder, (crosslinked) polystyrene resin beads, (crosslinked) polystyrene resin powder, (high density) polyethylene resin beads, (high density) polyethylene Examples thereof include resin powder, epoxy resin beads, epoxy resin powder, benzoguanamine resin beads, and benzoguanamine resin powder.

Specifically, the method for forming the resin flame retardant layer on the nonwoven fabric substrate is a two-component silicone elastomer paste (an organic solvent can be included in the viscosity modifier), a resin composition (paint) using a silicone resin emulsion, and a soft Using a paste sol mainly composed of a polyvinyl chloride resin, etc., a known coating method, for example, impregnation such as knife coating (single-sided processing on a nonwoven fabric base material) (the resin composition is impregnated inside the nonwoven fabric base material) The surface of the nonwoven fabric substrate is not coated with the resin composition) and impregnation coating (the nonwoven fabric substrate is impregnated with the resin composition, and the nonwoven fabric substrate surface is coated with the resin composition). The state in which the coating layer is formed) can be exemplified, and the resin flame retardant layer is 30 to 500 g / m ² including the buried portion by such impregnation, and the sound absorption for membrane ceiling of the present invention according to such an embodiment Mass of the sheet is one which does not exceed 2000 g / ^{m 2} in 100~1300g / ^{m 2.} The buried portion should have an impregnation depth of 1 to 35% with respect to the thickness of the nonwoven fabric and should not be an impregnated body that has penetrated the entire nonwoven fabric or a non-impregnated body that has not penetrated the nonwoven fabric at all. In addition, a soft polyvinyl chloride resin film with a thickness of 0.01 to 0.3 mm formed by calender molding or T-die extrusion method on a nonwoven fabric substrate is bonded (adhered) with or without paste sol impregnation. A lamination method may be used. The laminated interface between the nonwoven fabric and the resin flame retardant layer has an embedded portion (impregnated portion) into which a part of the resin flame retardant layer has entered, and the depth of the embedded portion (impregnated portion) is the thickness of the nonwoven fabric. 1 to 35% with respect to the thickness, particularly 10 to 35% is preferable from the viewpoint of the balance between the echo attenuation effect and the bending durability of the membrane material, and the depth of the buried portion (impregnated portion) is as much as the sheet width. A thing with a small variation width which approximates is preferable. If the depth of the buried part (impregnated part) contains more than 35% of the thickness of the nonwoven fabric, the sound absorption characteristics due to the echo attenuation effect may be insufficient, and if more than 1% is included. The adhesion of the resin flame retardant layer to the nonwoven fabric may be insufficient. The visible light transmittance (JIS Z8722) of the sound absorbing sheet for film ceiling of the present invention is 5 to 25%, which is most suitable for the effect of concealing the light source position at the same time as transmitting light. The depth of the buried part (impregnated part) is treated as a measured value of the buried part (impregnated part) at five points that are equally divided into six parts as the sheet width.

In addition, in the present invention, by including a non-combustible fabric in the resin flame retardant layer, the sound absorption effect of the sheet is increased, and at the same time, the tear strength and dimensional stability of the sheet are increased. Become a material. Non-flammable plain fabrics, twill fabrics, satin fabrics, basket fabrics, basket fabrics, triaxial fabrics and quadruple fabrics using these, etc. 30 to 300 g / m ² , preferably 75 to 200 g / m ² , mesh fabric, coarse fabric, high-density fabric and the like can be used. The inorganic multifilament yarn is composed of at least one selected from glass fiber, silica fiber, alumina fiber, and silica alumina fiber, and these are multifilaments having a filament diameter of 3 to 10 μm and a fineness of 69 to 2223 dtex, particularly 138 to 1112 dtex. Thus, it is a yarn formed by converging with 50 to 500 filaments, particularly 100 to 300 filaments. The glass fiber may have any glass composition such as E (non-alkali) glass, C (containing alkali) glass, G glass, A glass, S glass, D glass, and DE glass. These inorganic multifilament yarns are twisted or untwisted single yarns, or double yarns in which two single yarns are twisted together. The single yarn has a substantially circular, elliptical or flat cross section. It is. There is no limitation on the porosity of the fabric (the sum of the voids generated at the intersections of the shaft yarns), and if the porosity is a mesh shape exceeding 50%, the tear strength and the dimensional stability of the sheet are further improved. A high-density fabric with a porosity of 10% or less can increase the sound absorption effect of the sheet and at the same time increase the tear strength and dimensional stability of the sheet. These fabrics are preferably subjected to surface modification treatment with the silane coupling agent described in paragraph [0015] from the viewpoint of improving adhesion to the resin flame retardant layer.

The configuration in which the fabric is included in the resin flame retardant layer is sufficient if the resin flame retardant layer is formed on at least one side of the fabric. Such a configuration is as follows: 1) Silicone resin composition or soft vinyl chloride By coating the resin composition on one side or both sides of the fabric and laminating the nonwoven fabric as a base material on either side, 2) by dipping the fabric into a silicone resin composition or a soft vinyl chloride resin composition The flame retardant layer is formed on both sides of the fabric and laminated with a nonwoven fabric as a base material on either side, and in 1) and 2), the resin composition comprises hollow glass beads, shirasu balloons, fly ash balloons, synthetic mica. , And natural mica, etc., including or not including, non-foamed composition, or foamed composition (density 0.35-0.75 g) cm ^3), or a chemical foaming agent-containing composition (density 0.35~0.75g / cm ³⁾ or the like is used. In particular, the soft vinyl chloride resin composition is a foam-breathable or non-foamed leather form laminated on one side of a fabric using a calendered film, or a foam laminated on both sides in a foamed breathable or non-foamed leather form. In the form of breathable or non-foamed tarpaulin, an embodiment in which a nonwoven fabric is laminated as a base material is preferred. Weight of film ceiling sound absorbing sheet of the present invention by such embodiments are those not exceeding 2000 g / ^{m 2} in 130~1600g / ^{m 2.}

  The sound absorbing sheet for membrane ceiling of the present invention is constructed by freely combining any 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. Especially 1). A sheet with a width of about 1 m to 3 m and a length of about 1 m to 5 m is a combination of panels in which the entire circumference of the 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 hanging 2). In addition, a long sheet of 1m to 3m in width and 1m to 10m in width is a semi-circular arc in which two sides in the width direction are fixed to a ceiling beam or aluminum pressing material, and the sheet is loosened by its own weight without applying tension. It can be used for design art ceilings that are suspended in a state and represent a sequence of semi-arcs with multiple sheets 3). Also, one sheet with a width of about 1m to 3m and a length of about 1m to 5m is in the form of a square, rectangle, triangle, rhombus, etc., for each point on the outer periphery of the sheet, eyelet, turn buckle, mounting bracket, joint nut, etc. Can be used for design art ceilings that use drapes obtained by controlling tension by suspending to the ceiling beam system using ropes and springs.

  The sound absorbing sheet for membrane ceiling according to the present invention has a visible light transmittance (JIS Z8722) of 5 to 25%, and is printed on a resin flame retardant layer, so that an appearance display and an electric light source or sunlight can be used throughout the day and night. It enables row lamp display and stained glass display by light transmission. The printing can be any of known printing, for example, gravure printing, screen printing, transfer printing, and ink jet printing, but in the sound absorbing sheet for film ceiling of the present invention, the balance between light transmission and color development, nonflammability and In this connection, inkjet printing with a small amount of ink applied is suitable. In addition, by having a visible light transmittance (JIS Z8722) of 5 to 25%, it is possible to produce video productions (amusement, promotion, event information, emergency news, evacuation guidance information, etc.) by projecting good and clear images and movies with a projection projector. And

The sound absorption sheet for membrane ceiling according to the present invention is measured after the start of heating in the cone calorimeter test method (ISO 5660 Part 1) when radiant heat from a radiation electric heater is applied to the sound absorption sheet for membrane ceiling at 50 kW / m ^2. Viewpoint of non-combustibility characteristics that the total calorific value for 20 minutes is 8 MJ / m ² or less and that the combustion characteristics not exceeding 200 kW / m ² continues for 10 minutes or more after starting heating for 10 seconds or more. Is preferable.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these. First, a method for evaluating the sound absorbing sheet for membrane ceiling of the present invention will be described.
<Sound absorption rate>
Using the nonwoven fabric surface side of the sheet as the sound incident surface, the noise reduction coefficient (NRC value) according to JIS A1405 (normal incidence method) was calculated as the arithmetic average value of each sound absorption coefficient of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. The NRC value 0.11 of the nonwoven fabric (1) used in each example was compared with the NRC value 0.16 of the nonwoven fabric (2).
<Depth (impregnation) depth>
The buried portion (impregnated portion) at five points that are equally divided into six in the sheet width was obtained from the enlarged image of the sheet cross section, and was obtained as a percentage of the sheet thickness.
<Visible light transmittance>
A spectroscopic color meter CM3600d (manufactured by Konica Minolta Co., Ltd.) was used, and measurement was performed according to JIS Z8722.
<Combustion 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]
<Nonwoven fabric (1)>
Wet paper chopped strand made of E glass (300 glass fiber bundles, fiber diameter 15.8 μm, fiber length 25 mm, 3-methacryloxypropyltrimethoxysilane (silane coupling agent) 1 mass% acetic acid aqueous solution sizing) Then, a glass nonwoven fabric (1) containing 10% by mass of epoxy resin as a binder (weight per unit: 300 g / m ² , thickness: 2 mm) was used as a substrate.
<Resin flame retardant layer>
A paste-like composition of the following composition 1 is uniformly hung in the width direction of the nonwoven fabric (1), passed through a pressure-bonding part by a doctor blade, and a wet coating film by the paste-like composition of the composition 1 is applied to one surface of the nonwoven fabric (1). After the toluene is removed by preliminary drying, addition reaction curing is performed by heating in an electric furnace at 160 ° C. for 3 minutes, and a resin flame retardant layer is provided on one surface of the nonwoven fabric (1) at 120 g / m ^2. A sheet was obtained. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 32% (depth 0.64 mm) with respect to the thickness of the nonwoven fabric (1). Thereby, the resin flame retardant layer was adhered to the nonwoven fabric (1). The mass of the obtained sheet was 420 g / m ² .
[Formulation 1] Silicone-based resin paste composition * Addition reaction curable silicone elastomer (using the following two liquids)
Both ends vinyldimethylsiloxy group-capped dimethylpolysiloxane 50 parts by mass Both ends trimethylsiloxy group-capped methylhydrogenpolysiloxane 50 parts by mass Platinum group compound (catalyst) 0.2 parts by mass Crosslinked acrylic resin beads (light diffusing agent) particle size 8 μm 5 parts by weight Melamine cyanurate (flame retardant) 10 parts by weight Aluminum hydroxide (flame retardant) 10 parts by weight Toluene (diluent) 50 parts by weight

[Example 2]
A sheet having a resin flame retardant layer of 120 g / m ² provided on one surface of the nonwoven fabric (1) was obtained in the same manner as in Example 1 except that the formulation 1 in Example 1 was changed to the following formulation 2. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 32% (depth 0.64 mm) with respect to the thickness of the nonwoven fabric (1). As a result, hollow glass beads (an echo attenuation agent) were also included in the buried portion of the nonwoven fabric (1). The mass of the obtained sheet was 420 g / m ² .
[Formulation 2] Silicone-based resin paste composition * Addition reaction curable silicone elastomer (using the following two liquids)
Both ends vinyldimethylsiloxy group-capped dimethylpolysiloxane 50 parts by mass Both ends trimethylsiloxy group-capped methylhydrogenpolysiloxane 50 parts by mass Platinum group compound (catalyst) 0.2 parts by mass Hollow glass beads (resonance attenuator) Particle size 15 μm 10 Mass parts Crosslinked acrylic resin beads (light diffusing agent) Particle size 8 μm 5 parts by mass Melamine cyanurate (flame retardant) 10 parts by mass Aluminum hydroxide (flame retardant) 10 parts by mass Toluene (diluent) 50 parts by mass * Resin flame retardant The amount of hollow glass beads in the layer is 7.4% by weight.

Example 3
A plain woven fabric with a porosity of 1% using E glass multifilament yarn (filament diameter 9 μm, 400 filaments: flat yarn with 75 dtex) as the warp and weft of the base fabric. Wet coating with a paste-like composition of Formula 1 using a glass cloth treated with a weft driving density of 40 / inch, a mass of 250 g / m ² , and a silane coupling agent (3-glycidoxypropyltrimethoxysilane) Is uniformly formed on both sides of the glass cloth, and this is used as a resin flame retardant layer (including the glass cloth as a core material) and heated in an electric furnace at 160 ° C. for 3 minutes with the nonwoven fabric (1) laminated on one side. Then, addition reaction curing was performed to obtain a sheet in which 410 g / m ² of a resin flame retardant layer (including glass cloth as a core material) was provided on one surface of the nonwoven fabric (1). A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed over the entire surface with a width in the vicinity of 24% (depth 0.48 mm) with respect to the thickness of the nonwoven fabric (1). Thereby, the resin flame retardant layer was adhered to the nonwoven fabric (1). The mass of the obtained sheet was 710 g / m ² .

Example 4
In the sheet of Example 3, a resin flame retardant layer (including glass cloth in the core material) is 410 g / m on one surface of the nonwoven fabric (1) in the same manner as in Example 3 except that Formulation 1 is changed to Formulation 3 below. ^{2 A} provided sheet was obtained. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed over the entire surface with a width in the vicinity of 24% (depth 0.48 mm) with respect to the thickness of the nonwoven fabric (1). As a result, the embedded portion of the nonwoven fabric (1) also contained natural mica (muscovite: echo damping agent). The mass of the obtained sheet was 710 g / m ² .
[Formulation 3] Silicone-based resin paste composition * Addition reaction curable silicone elastomer (using the following two liquids)
Both ends vinyldimethylsiloxy group-capped dimethylpolysiloxane 50 parts by mass Both ends trimethylsiloxy group-capped methylhydrogenpolysiloxane 50 parts by mass Platinum group compound (catalyst) 0.2 parts by mass Natural mica (muscovite: echo damping agent) particle size 25 μm 10 parts by weight Crosslinked acrylic resin beads (light diffusing agent) particle size 8 μm 5 parts by weight Melamine cyanurate (flame retardant) 10 parts by weight Aluminum hydroxide (flame retardant) 10 parts by weight Toluene (diluent) 50 parts by weight * Resin The amount of natural mica (muscovite) in the flame retardant layer is 7.4% by mass.

Example 5
<Resin flame retardant layer>
A paste sol composition of the following formulation 4 is uniformly hung in the width direction of the nonwoven fabric (1), passed through a crimping part by a doctor blade, and a wet coating film by the paste sol composition of the formulation 4 is applied to one surface of the nonwoven fabric (1). Was uniformly heated and heated in an electric furnace at 180 ° C. for 3 minutes for gelation treatment to obtain a sheet in which a resin flame retardant layer was provided at 150 g / m ^{2 on} one surface of the nonwoven fabric (1). A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 30% (depth 0.6 mm) with respect to the thickness of the nonwoven fabric (1), Thereby, the resin flame retardant layer was adhered to the nonwoven fabric (1). The mass of the obtained sheet was 450 g / m ² .
[Formulation 4] Paste sol composition with soft vinyl chloride resin Emulsion-polymerized vinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 60 parts by mass * Product name: Hexamol DINCH ( (Made by BASF)
Cresyl diphenyl phosphate (flameproof plasticizer) 10 parts by mass (also known as CDP: cresyl diphenyl phosphate)
Antimony oxide (flame retardant) 15 parts by weight Molybdenum oxide (flame retardant) 5 parts by weight Cross-linked acrylic resin beads (light diffusing agent) particle size 8 μm 5 parts by weight Barium zinc composite compound (stabilizer) 2 parts by weight Isocyanurate-modified triisocyanate (TDI trimer) 3 parts by mass Diethylene glycol (polyol) 3 parts by mass * Addition reaction of isocyanurate-modified triisocyanate improves adhesion to the nonwoven fabric (1) and at the same time, soft vinyl chloride resin by polymerization with diethylene glycol By forming a polyurethane structure inside, the adhesion to the nonwoven fabric (1) is further strengthened.

Example 6
A sheet having a resin flame retardant layer of 150 g / m ² provided on one surface of the nonwoven fabric (1) was obtained in the same manner as in Example 5 except that the formulation 4 in Example 5 was changed to the following formulation 5. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 30% (depth 0.6 mm) with respect to the thickness of the nonwoven fabric (1), As a result, the buried portion of the nonwoven fabric (1) also contained a shirasu balloon (an echo attenuating agent). The mass of the obtained sheet was 450 g / m ² .
[Formulation 5] Paste sol composition with soft vinyl chloride resin Emulsion polymerization vinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 60 parts by mass * Product name: Hexamol DINCH ( (Made by BASF)
Cresyl diphenyl phosphate (flameproof plasticizer) 10 parts by mass (also known as CDP: cresyl diphenyl phosphate)
Antimony oxide (flame retardant) 15 parts by mass Molybdenum oxide (flame retardant) 5 parts by mass Cross-linked acrylic resin beads (light diffusing agent) particle size 8 μm 5 parts by weight Shirasu balloon (echo attenuation agent) particle size 13 to 28 μm 10 parts by mass Barium Zinc complex compound (stabilizer) 2 parts by weight Isocyanurate-modified triisocyanate (TDI trimer) 3 parts by weight Diethylene glycol (polyol) 3 parts by weight * Adhesion with nonwoven fabric (1) by addition reaction of isocyanurate-modified triisocyanate At the same time, the adhesion with the nonwoven fabric (1) is further strengthened by forming a polyurethane structure inside the soft vinyl chloride resin by polymerization with diethylene glycol.
* The amount of Shirasu balloon in the resin flame retardant layer is 4.7% by mass.

Example 7
Mechanically stir a soft vinyl chloride resin paste sol composition in which 2 parts by weight of dimethyl silicone oil was added as a foam stabilizer to Formulation 4 of Example 5 with a stirrer (mounted with a blade made of a combination of several stainless steels and metals). Then, whip (2 times foam) forcibly entraining bubbles is clearance coated on one side of the non-woven fabric (1) as it is, uniformly forming a wet film foam with paste, and heating in an electric furnace at 180 ° C for 3 minutes Then, a gelling treatment was performed to obtain a sheet in which 75 g / m ² of resin flame retardant layer foam (density 0.5 g / cm ³ ) was provided on one surface of the nonwoven fabric (1). A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 13% (depth 0.26 mm) with respect to the thickness of the nonwoven fabric (1). As a result, the embedded portion of the nonwoven fabric (1) contained bubbles. The mass of the obtained sheet was 375 g / m ² .

Example 8
A soft vinyl chloride resin paste sol composition obtained by adding 2 parts by mass of azodicarboxamide as a chemical foaming agent to Formulation 4 of Example 5 is uniformly suspended in the width direction of the nonwoven fabric (1), and allowed to pass through a pressure-bonding part by a doctor blade. Then, a wet coating film by the paste sol composition is uniformly formed on one surface of the nonwoven fabric (1), heated in an electric furnace at 160 ° C. for 3 minutes, preliminarily gelled, and then heated at 210 ° C. for 1 minute. A sheet in which 75 g / m ² of a resin flame retardant layer foam (double foaming: density 0.5 g / cm ³ ) is provided on one surface of the nonwoven fabric (1) by thermally decomposing and vaporizing azodicarboxamide. Obtained. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 30% (depth 0.6 mm) with respect to the thickness of the nonwoven fabric (1), As a result, the embedded portion of the nonwoven fabric (1) contained bubbles. The mass of the obtained sheet was 375 g / m ² .

Example 9
A plain woven fabric with a porosity of 1% using E glass multifilament yarn (filament diameter 9 μm, 400 filaments: flat yarn with 75 dtex) as the warp and weft of the base fabric. Wet coating with a paste sol composition of Formulation 4 using a glass cloth treated with a weft driving density of 40 / inch, a mass of 250 g / m ² , and a silane coupling agent (3-glycidoxypropyltrimethoxysilane) 100 g / m ² is uniformly formed on one side of a glass cloth, and this is used as a resin flame retardant layer (glass cloth is included in the core material), and the nonwoven fabric (1) is laminated on the resin flame retardant layer at 180 ° C. × Gelling treatment was performed by heating in an electric furnace for 3 minutes to obtain a sheet provided with a resin flame retardant layer (including glass cloth as a core material) on one surface of the nonwoven fabric (1). A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 22% (depth 0.44 mm) with respect to the thickness of the nonwoven fabric (1), Thereby, the resin flame retardant layer was adhered to the nonwoven fabric (1). The mass of the obtained sheet was 650 g / m ² .

Example 10
In the sheet of Example 9, a resin flame retardant layer (including glass cloth in the core material) is 350 g / m on one surface of the nonwoven fabric (1) in the same manner as in Example 9 except that the formulation 4 is changed to the following formulation 6. ^{2 A} provided sheet was obtained. A part of the resin flame retardant layer is impregnated inside the nonwoven fabric (1), and the buried portion is formed on the entire surface with a width in the vicinity of 22% (depth 0.44 mm) with respect to the thickness of the nonwoven fabric (1), As a result, the buried portion of the nonwoven fabric (1) also contained fly ash balloons (an echo attenuation agent). The mass of the obtained sheet was 650 g / m ² .
[Formulation 6] Paste sol composition with soft vinyl chloride resin Emulsion polymerization vinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylate diisononyl (plasticizer) 60 parts by mass * Product name: Hexamol DINCH ( (Made by BASF)
Cresyl diphenyl phosphate (flameproof plasticizer) 10 parts by mass (also known as CDP: cresyl diphenyl phosphate)
Antimony oxide (flame retardant) 15 parts by mass Molybdenum oxide (flame retardant) 5 parts by mass Cross-linked acrylic resin beads (light diffusing agent) particle size 8 μm 5 parts by mass Fly ash balloon (echo attenuation agent) particle size 10-30 μm 10 parts by mass Barium zinc complex compound (stabilizer) 2 parts by weight Isocyanurate-modified triisocyanate (TDI trimer) 3 parts by weight Diethylene glycol (polyol) 3 parts by weight * By addition reaction of isocyanurate-modified triisocyanate, At the same time as improving the adhesion, a polyurethane structure is formed inside the soft vinyl chloride resin by polymerization with diethylene glycol, thereby further strengthening the adhesion with the nonwoven fabric (1).
* The amount of fly ash balloon in the resin flame retardant layer is 4.7% by mass.

[Examples 11 to 20]
Except having changed the nonwoven fabric (1) used in Examples 1-10 into the following nonwoven fabric (2), the sheet | seat of Examples 11-20 was obtained like Example 1-10, respectively.
<Nonwoven fabric (2)>
Wet paper chopped strand made of E glass (300 glass fiber bundles, fiber diameter 15.8 μm, fiber length 25 mm, 3-methacryloxypropyltrimethoxysilane (silane coupling agent) 1 mass% acetic acid aqueous solution sizing) Then, a glass nonwoven fabric (2) containing 10% by mass with an epoxy resin as a binder (weight per unit: 750 g / m ² , thickness: 5 mm) was used as the base material.

  Each of the sheets of Examples 1 to 20 can be used as a ceiling material, and has lightness that is unlikely to cause serious human damage even if it collapses due to an earthquake. (JIS A1405: NRC value improvement by normal incidence method), NRC value is improved compared to non-woven fabric (1) and non-woven fabric (2), and NRC value is also improved in comparison with Comparative Example 1 and Comparative Example 2. In addition, not only a non-combustible sheet can be obtained, but also having a visible light transmittance (JIS Z8722) of 5 to 25%, a resin flame-retardant layer printed on it has an external display and electricity throughout the day and night. It enables the display of light and stained glass by using a natural light source or the transmission of sunlight, and on a solid sheet without printing, it enables video production by projecting good and clear images and videos on a projection projector.

[Comparative Example 1]
In Example 1, in a sheet provided with 120 g / m ² of a resin flame retardant layer on one surface of the nonwoven fabric (1), the liquid viscosity of the paste-like composition is reduced by adding 20 parts by mass of toluene to Formulation 1, and the nonwoven fabric (1) is reduced. The resin flame retardant layer impregnation depth was increased, and the buried portion of the resin flame retardant layer was uniformly formed with a width of 90% (depth 1.8 mm) with respect to the thickness of the nonwoven fabric (1), and a mass of 420 g / m ² sheets were obtained.

[Comparative Example 2]
In Example 1, in the sheet in which the resin flame retardant layers are provided on both sides of the nonwoven fabric (1) at 120 g / m ² , the buried portions of the resin flame retardant layers are 32% each on the front and back sides with respect to the thickness of the nonwoven fabric (1) (depth). A sheet having a mass of 540 g / m ² and having a non-embedded portion in the middle of the thickness of the nonwoven fabric (1).

  According to the present invention, it can be used as a ceiling material, has lightness that is unlikely to cause serious human damage even if it collapses in the unlikely event of an earthquake, and further has a sound absorption property (JIS A1405: vertical incidence) NRC value improvement by the law), and not only a non-combustible sheet is obtained, but also having a visible light transmittance (JIS Z8722) of 5 to 25%, and by printing on the resin flame retardant layer, Throughout the day and night, it is possible to display exterior lights and electric light sources, or display lamps and stained glass by transmitting sunlight, as well as providing visual effects by projecting good and clear images and movies. Buildings, sound absorbers, ceiling area components installed on the ceilings of venues, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station building lobbies, airport lobbies, shopping malls, etc. Or it is suitable as the sound absorbing member as a ceiling area component associated object.

1: Sound absorbing sheet for membrane ceiling 2: Non-woven fabric 3: Resin flame retardant layer 3-1: Buried portion 3-2: Bubble or balloon 4: Fabric

Claims (5)

  A laminate in which a nonwoven fabric mainly composed of long glass fibers is used as a base material and a resin flame retardant layer containing a silicone resin or a soft vinyl chloride resin is provided on one side of the nonwoven fabric, the nonwoven fabric and the resin In the laminated interface with the flame layer, the nonwoven fabric has an embedded portion in which a part of the resin flame retardant layer has entered, and the depth of the embedded portion is 1 to 35% with respect to the thickness of the nonwoven fabric. A sound-absorbing sheet for a membrane ceiling, characterized by being.   The sound absorbing sheet for membrane ceiling according to claim 1, wherein the resin flame retardant layer includes a non-combustible fabric.   3. The membrane ceiling according to claim 1, wherein the resin flame retardant layer contains 3 to 25 mass% of one or more selected from hollow glass beads, shirasu balloons, fly ash balloons, synthetic mica, and natural mica. Sound absorbing sheet. The sound absorbing sheet for film ceiling according to any one of claims 1 to 3, wherein the resin flame retardant layer and the buried portion are formed to a density of 0.35 to 0.75 g / cm ³ by coating with a foam-like composition. . The membrane ceiling according to any one of claims 1 to 3, wherein the resin flame retardant layer and the buried portion are formed to a density of 0.35 to 0.75 g / cm ³ by coating with a chemical foaming agent-containing composition. Sound absorbing sheet.