TW202112536A - Sound-absorbing material, sound-absorption-improving coating, and sound-absorption-improving sheet - Google Patents

Abstract

The present disclosure pertains to a sound-absorbing material comprising a first base material layer having communication holes, and a composite layer provided on the first base material layer, the composite layer including porous particles and/or hollow particles, and a binder resin.

Description

Sound-absorbing material, sound-absorbing improvement coating liquid, and sound-absorbing improvement sheet

The present invention relates to a sound-absorbing material, a coating liquid for improving sound-absorbing properties, and a sheet for improving sound-absorbing properties.

A single-layer sound-absorbing structure is known, which is composed of a melt blown non-woven fabric (for example, Patent Document 1). [Prior Technical Literature] (Patent Document)

Patent Document 1: Japanese Patent Application Publication No. 2012-214957

[The problem to be solved by the invention] In the case of a single-layer sound-absorbing structure composed of a non-woven fabric, the sound-absorbing characteristics in the low-frequency region may be insufficient.

The present invention was developed in view of the above-mentioned reasons, and its purpose is to provide a sound-absorbing material that has excellent sound-absorbing properties in the low-frequency region. [Technical means to solve the problem]

The present invention provides a sound-absorbing material comprising: a first substrate layer with connected holes and a composite layer provided on the first substrate layer; wherein the composite layer includes at least one of porous particles and hollow particles , And adhesive resin.

The present invention provides a sound-absorbing material, which comprises: a first substrate layer with communicating holes and a composite sheet disposed on the first substrate layer; wherein the supporting substrate of the composite sheet is provided with a composite layer, the composite The layer includes at least one of porous particles and hollow particles, and a binder resin.

In one aspect, the sound-absorbing material may further include a second substrate layer with communicating holes under the first substrate layer.

In one aspect, the sound-absorbing material may further have a third base material layer with communicating holes on the composite layer.

In one aspect, the thickness of the sound-absorbing material may be 1-100 mm.

The present invention provides a sound-absorbing improved sheet with a composite layer on a supporting substrate, the composite layer comprising at least one of porous particles and hollow particles, and a binder resin.

The present invention provides a coating solution for improving sound absorption, which includes at least one of porous particles and hollow particles, a binder resin, and a liquid medium.

In one aspect, the specific surface area of the particles may be 1 to 1000 m ² /g.

In one aspect, the average particle size D50 of the particles may be 1-100 μm.

In one aspect, the bulk density (bulk density) of the particles may be 0.05 to 1.00 g/cm ³ .

In one aspect, the density of the first substrate layer may be 0.005 to 0.30 g/cm ³ .

In one aspect, the ventilation resistance of the first substrate layer may be 0.003 to 0.500 kPa·s/m. [effect]

According to the present invention, it is possible to provide a sound absorbing material having excellent sound absorbing characteristics in a low frequency region.

＜Sound-absorbing material＞ Figure 1 is a schematic cross-sectional view of a sound absorbing material according to an embodiment. The sound absorbing material 10 includes a first base material layer 2 having communicating holes, and a composite layer 1 provided on the first base material layer 2. The composite layer 1 includes at least one of porous particles and hollow particles, and a binder resin.

Fig. 2 is a schematic cross-sectional view of a sound absorbing material of another embodiment. The sound absorbing material 20 includes a first base material layer 2 having communicating holes, and a composite sheet 4 provided on the first base material layer 2. The supporting substrate 3 of the composite sheet 4 is provided with a composite layer 1 including at least one of porous particles and hollow particles, and a binder resin.

The sound (sound energy) incident from the side of the composite layer will be dissipated in the form of heat when it penetrates the sound-absorbing material. With this, the attenuation of the sound can be observed.

(Substrate layer) Examples of the substrate layer having continuous pores include resin foams, nonwoven fabrics, porous polymer bodies, and porous ceramics. Among these, the base material layer may be a resin foam or a non-woven fabric from the viewpoint of excellent sound absorption characteristics in the low frequency region. When there are multiple substrate layers, each substrate layer may be composed of the same material, or may be composed of different materials.

Examples of materials for the resin foam include: polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, acrylic resin, polystyrene resin, melamine resin, silicone resin, natural rubber, synthetic Rubber etc. From the viewpoint of heat resistance, flame retardancy, etc., the material of the resin foam may be a melamine resin.

Examples of fibers for constituting the nonwoven fabric include organic fibers and inorganic fibers. Examples of organic fibers include polyolefin fibers such as polyethylene (low density or high density), polypropylene, copolymerized polyethylene, and copolymerized polypropylene; polyethylene terephthalate, polytrimethylene terephthalate , Polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate and other polyester fibers; acrylic fibers; polyurethane fibers; acetate fibers; polyamide fibers; nylon fibers ; Rayon fiber; wool and other natural fibers. In addition, examples of inorganic fibers include glass fibers, metal fibers, ceramic fibers, and carbon fibers. The fibers used to form the non-woven fabric can include one or more of these.

From the viewpoint of excellent sound absorption characteristics in the low-frequency region, the thickness of the substrate layer can be set to 0.1 to 50 mm, 0.5 to 20 mm, or 2.0 to 10 mm. When there are multiple substrate layers, each substrate layer may have the same thickness or different thicknesses. From the viewpoint of excellent sound absorption characteristics in the low frequency region, when there are a plurality of base material layers, the thickness of the base material layer on the sound incident side may be thinner than the thickness of other base material layers.

From the standpoint of excellent sound absorption characteristics in the low-frequency region, the mass per unit area of the base material layer can be set to 10 to 1000 g/m ² , 30 to 700 g/m ² , or 50 to 500 g/m2 m ² may also be 100 to 300 g/m ² . When there are multiple substrate layers, each substrate layer may have the same mass per unit area or different mass per unit area.

From the viewpoint of excellent sound absorption characteristics in the low frequency region, the density of the base material layer can be 0.005 to 1.0 g/m ³ , 0.005 to 0.50 g/m ³ , or 0.005 to 0.30 g/m ³ It can also be 0.01 to 0.25 g/m ³ , or 0.01 to 0.10 g/m ³ . When there are multiple substrate layers, each substrate layer may have the same density or different densities.

From the viewpoint of excellent sound absorption characteristics in the low-frequency region, the ventilation resistance of the base layer can be set to 0.003 to 0.500 kPa·s/m, 0.004 to 0.300 kPa·s/m, or 0.005 to 0.25 kPa・S/m, it can also be 0.01～0.15 kPa・s/m. The ventilation resistance of the base layer is measured with a ventilation tester (KES-F8) manufactured by KATO TECH Co., Ltd. and the like.

(Composite layer) The composite layer contains at least one of porous particles and hollow particles. Hereinafter, according to the actual situation, the porous particles and hollow particles are collectively referred to as "sound-absorbing particles."

Examples of the porous particles contained in the composite layer include inorganic porous particles, organic porous particles, and composite porous particles (organic-inorganic composite porous particles) that also contain these constituent materials.

Examples of constituent materials of inorganic porous particles include metal oxides (including composite oxides), hydroxides, nitrides, carbides, carbonates, borates, sulfates, silicates, phosphates, and the like. Specifically, for example, metal oxides such as silicon oxide, titanium oxide, zinc oxide, aluminum oxide, zirconium oxide, tin oxide, magnesium oxide, and potassium titanate; hydrogen oxides such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; Oxides; nitrides such as silicon nitride, titanium nitride, aluminum nitride; carbides such as silicon carbide and titanium carbide; carbonates such as calcium carbonate and magnesium carbonate; borates such as aluminum borate and magnesium borate; calcium sulfate, magnesium sulfate Such as sulfates; silicates such as calcium silicate and magnesium silicate; phosphates such as calcium phosphate, etc. In addition, the above-mentioned constituent materials can also be used: glass, zeolite, aerogel, etc.

As the constituent material of the organic porous particles, for example, charcoal, activated carbon, polymer porous sintered body, resin foam; or, (meth)acrylate type (for example, cross-linked polymethyl methacrylate) ), styrene-based, silicone-based, nylon-based resin porous bodies, etc.

Examples of the hollow particles contained in the composite layer include inorganic hollow particles, organic hollow particles, and composite hollow particles (organic-inorganic composite hollow particles) that also contain these constituent materials. The hollow particle may be a single mesoporous particle with a single hole in the particle, or a multi-hollow particle with a plurality of holes.

Examples of the constituent material of the inorganic hollow particles include silica, glass, white sand, perlite, alumina, fly ash, shale, obsidian, volcanic rock, and the like.

Examples of the constituent material of the organic hollow particles include: styrene resins such as cross-linked styrene-acrylic resins; (meth)acrylic resins such as cross-linked polymethyl methacrylate and acrylonitrile-acrylic resins; Phenolic resins; fluorine resins; polyamide resins; polyimide resins; polycarbonate resins; polyether resins; polyvinylidene chloride resins; epoxy resins; urea resins, etc.

The sound-absorbing particles may be used singly, or two or more of them may be used in combination.

From the viewpoint of the dispersion in the composite layer and the sound absorption characteristics in the low frequency region, the average particle size D50 of the sound absorbing particles can be set to 0.1 to 1000 μm, 1 to 100 μm, or 1 to 50 μm. It can be 3 to 50 μm, or 4 to 30 μm. The average particle diameter D50 of the sound-absorbing particles can be measured by, for example, a laser diffraction scattering method.

From the viewpoint of the dispersion in the composite layer and the sound absorption characteristics in the low-frequency region, the specific surface area of the sound-absorbing particles can be set to 1 to 2000 m ² /g, 1 to 1000 m ² /g, or 2 ～1000 m ² /g, can be 4～1000 m ² /g. In addition, from the viewpoint of further improving the sound absorbing performance, the specific surface area of the sound absorbing particles can be 500 to 1000 m ² /g, and 700 to 900 m ² /g. From the viewpoint of being highly filled in the adhesive in addition to dispersibility and sound absorption properties, the specific surface area of the sound absorbing particles may be 1 to 200 m ² /g, and may be 2 to 100 m ² /g. The specific surface area can be measured by the BET method. As the measuring device, a gas adsorption amount measuring device (manufactured by Quantachrome Instruments Japan Co., Ltd., Autosorb-iQ (Autosorb is a registered trademark)) can be used.

From the viewpoint of the dispersion in the composite layer and the sound absorption characteristics in the low-frequency region, the bulk density of the sound-absorbing particles can be set to 0.05 to 1.00 g/cm ³ , 0.10 to 0.80 g/cm ³ , or 0.10 ～0.75 g/cm ³ , can be 0.15～0.60 g/cm ³ . The bulk density can be measured by mercury intrusion method or the like. As a measuring device, a porosimeter (porosimeter, manufactured by Shimadzu Micromeritics Co., Ltd., AutoPore 9520 type) can be used.

From the viewpoint of sound absorption characteristics in the low frequency region, the content of sound absorbing particles in the composite layer can be set to 10 to 99% by mass, and can be 20 to 90% by mass based on the total mass of the composite layer.

The binder resin has the function of binding sound-absorbing particles. Examples of binder resins include epoxy resins (such as epoxy ester resins), silicone resins, phenol resins, urea resins, melamine resins, polyurethane resins, polyethylene resins, polypropylene resins, polystyrene resins, and polystyrene resins. Ester resin, acrylic resin (polymer containing acrylate or methacrylate as the main structural unit), polyvinyl acetate, polyamide resin, polyimide resin, cellulose resin, polyethylene resin , Polyvinyl chloride resin (for example: polyvinyl chloride resin, ethylene-vinyl chloride copolymer resin), etc. In addition, acrylic resins (polymers containing acrylic acid, acrylate, methacrylic acid, and methacrylate as structural units), polyethylene oxide, polyethylene glycol, and the like can also be used as the binder resin. From the viewpoints of heat resistance, flame resistance, and toughness, among these, silicone resins, acrylic resins, phenol resins, polyester resins, and polyvinyl chloride resins can be suitably used.

In addition, examples of the cellulose resin include hydroxypropyl methylcellulose, ammonium carboxymethyl cellulose, and hydroxyethyl methylcellulose. Moreover, as a polyvinyl resin, polyvinyl alcohol, polyvinylpyrrolidone, etc. are mentioned, for example.

Examples of acrylic resins include polyacrylic acid, acrylic copolymers, polyacrylates, and acrylate copolymers.

The composite layer can contain the following as other components: thickeners, fibrous substances, pigments, leveling agents, film-forming aids, etc. used when preparing the coating liquid described later.

From the viewpoints of the adhesiveness of sound-absorbing particles and the strength of the composite layer, relative to 100 parts by mass of sound-absorbing particles, the content of the binder resin in the composite layer can be 10 to 1000 parts by mass, or 100 to 500 parts by mass. .

From the viewpoint of excellent sound absorption characteristics in the low frequency region, the thickness of the composite layer can be set to 1 to 1000 μm, 5 to 500 μm, 10 to 250 μm, or 20 to 100 μm. In addition, from the viewpoint of the sound absorption characteristics in the low-frequency region, the ratio of the thickness of the composite layer to the thickness of the base layer (the thickness of the base layer/the thickness of the composite layer) can be set to 1 to 20000, and may be 10 ～10000, can also be 100～1000.

(Supporting base material) The composite layer can be disposed on the supporting substrate. When it is difficult to form a composite layer on the substrate layer, the supporting substrate can be used as a support for the composite layer. As the supporting substrate, for example, a non-woven fabric with high density, a resin film, a metal film, etc. may be mentioned. The combination of the supporting substrate and the composite layer provided on the supporting substrate is called a composite sheet. The composite sheet can improve sound absorption characteristics by being laminated on the object, and therefore can be referred to as a sound absorption improving sheet.

Examples of fibers for constituting the nonwoven fabric include the fibers exemplified in the item of the above-mentioned base material layer.

From the viewpoint of being able to support the composite layer without hindering the sound absorption characteristics in the low frequency region, the thickness of the support base material can be set to 1 to 500 μm, 5 to 250 μm, or 50 to 200 μm.

From the viewpoint of excellent sound absorption properties in the low frequency region, the mass per unit area of the support base material can be set to 1 to 500 g/m ² , 20 to 250 g/m ² , or 30 to 200 g/m2 m ² .

From the viewpoint of supporting the composite layer, the density of the supporting base material can be 0.01 to 1.0 g/m ³ , 0.10 to 0.50 g/m ³ , or 0.20 to 0.50 g/m ³ .

(Other base material layer) From the viewpoint of improving the sound absorption effect in the low frequency region and adjusting the frequency peak of the sound absorption frequency, the sound absorbing material may be further provided with another base material layer having continuous holes. In other words, the sound-absorbing material, in addition to the first base material layer and the composite layer, may further have a second base material layer with communicating holes under the first base material layer, and may further have a third base material layer with communicating holes on the composite layer. Substrate layer. These other substrate layers can be applied to the matters described in the item of the above-mentioned substrate layer.

(Adhesive layer) The sound-absorbing material can be provided with an adhesive layer between the above-mentioned layers as required. For example, the sound absorbing material may be provided with an adhesive layer between the first substrate layer and the second substrate layer, between the supporting substrate (composite sheet) and the first substrate layer, or the like. Examples of the adhesive layer include polyester resins, vinyl acetate resins, ethylene-vinyl acetate copolymer resins, isobutylene-maleic anhydride copolymer resins, acrylic copolymer resins, acrylic monomers, acrylic oligomers, Vinyl chloride resin, urethane resin (including moisture-curing type), silylated urethane resin, epoxy resin, modified epoxy resin, polyolefin resin such as polyethylene resin, ionomer resin, silicone resin, modified Quality silicone resin; synthetic rubber such as styrene-butadiene rubber, chloroprene rubber, nitrile rubber; natural rubber such as isoprene rubber; water glass, silicate and other layers containing adhesive components; or A support composed of paper, cloth, non-woven fabric, fiber, resin film, metal tape, etc. is provided with a laminate containing these adhesive components on both sides. In addition, the adhesive layer may be a thing (adhesive sheet) provided with a layer containing the above-mentioned adhesive component or the above-mentioned laminate on both sides of the resin film. Each adhesive layer may be composed of the same material, or may be composed of different materials.

The thickness of the adhesive layer is not particularly limited, and can be 0.01 to 500 μm, and can be 1 to 250 μm. Each adhesive layer can have the same thickness or different thicknesses.

From the standpoints of sound absorption characteristics, workability of materials, space saving, etc., the thickness of the sound absorbing material can be set to 1 to 100 mm, 2 to 50 mm, or 5 to 30 mm.

The sound-absorbing properties of the sound-absorbing material can be adjusted according to the composition of each layer and the state of the build-up. The normal incidence sound absorption rate of the sound absorbing material measured in accordance with JIS A 1405-1 can be set as follows, for example.

In the case of a sound-absorbing material with a base layer and a composite layer, the vertical incidence sound absorption rate is any frequency below 1000 Hz, specifically, at least any frequency among, for example, 500 Hz, 750 Hz, and 1000 Hz, It can be set to 0.4 or more, but may be 0.5 or more. The vertical incidence sound absorption rate can be set to 0.25 or more at 750 Hz, and can be 0.3 or more. The vertical incidence sound absorption rate can be set to 0.1 or more at 500 Hz, and can be 0.15 or more.

In the case of a sound absorbing material with a base material layer and a composite sheet, the sound absorption rate at normal incidence is at any frequency below 1000 Hz, specifically, at least any frequency among, for example, 500 Hz, 750 Hz, and 1000 Hz , Can be set to 0.5 or more, and may be 0.6 or more. The vertical incidence sound absorption rate can be set to 0.2 or more at 750 Hz, and can be 0.4 or more. The vertical incidence sound absorption rate can be set to 0.1 or more at 500 Hz, and can be 0.2 or more.

＜Manufacturing method of sound absorbing material＞ The sound absorbing material 10 shown in FIG. 1 can be manufactured by applying a coating liquid for forming the composite layer 1 on the first base material layer 2. When the sound-absorbing material is further provided with a second substrate layer under the first substrate layer, the two layers can be adhered by the adhesive layer, but the two layers can also be laminated without adhering the two layers. In addition, when the sound absorbing material further includes a third substrate layer on the composite layer, the coating liquid for forming the composite layer can be used to adhere the two layers, but the two layers can also be laminated without adhesion.

The sound-absorbing material 20 shown in Fig. 2 can be manufactured by laminating a composite sheet 4 and a first base material layer 2, and the composite sheet 4 is formed by applying a coating solution for forming the composite layer 1 to a supporting base material. 3 from above. At this time, the composite sheet can be adhered to the first base material layer by the adhesive layer, but it can also be laminated without the adhesion.

The laminated body used to form the sound absorbing material can be used in a state of being housed in a frame.

The coating liquid for forming the composite layer contains sound-absorbing particles, a binder resin, and a liquid medium. Since this coating liquid can improve the sound absorption characteristics of the object, it can be called a sound absorption improvement coating liquid.

The binder resin is as illustrated in the item of the above-mentioned composite layer. Furthermore, when the binder resin is a thermosetting resin, the coating liquid may further contain a curing agent. The curing agent is not particularly limited, and can be appropriately changed according to the type of thermosetting resin. For example, when the thermosetting resin is an epoxy resin, the curing agent can be a conventional epoxy resin curing agent. Examples of epoxy resin curing agents include amine curing agents, acid anhydride curing agents, polyamide curing agents, etc. From the viewpoint of reactivity, amine curing agents and polyamide curing agents can be suitably used. hardener.

Examples of the liquid medium include water and organic solvents. The organic solvent is not particularly limited as long as it can disperse sound-absorbing particles, and examples include aromatic hydrocarbons such as toluene, xylene, trimethylbenzene, cumene, and p-cymene; hexane, heptane Aliphatic hydrocarbons such as, pentane; ethers such as diethyl ether, tetrahydrofuran, 1,4-dioxane; alcohols such as methanol, ethanol, isopropanol, butanol, ethylene glycol, diethylene glycol, and propylene glycol; Acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone and other ketones; methyl acetate, ethyl acetate, butyl acetate and other esters ; N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone and other amides. From the viewpoint of volatility, boiling point, etc., among these, alcohols and ketones can be used, and in particular, alcohols can be suitably used. Since alcohols and ketones are easily mixed with water, water-based resins, etc., they are also suitable when used in combination with these components.

The coating liquid may contain the following as other ingredients: thickeners, fibrous substances, pigments, leveling agents, film-forming aids, and the like.

From the viewpoints of dispersibility, viscosity of the coating liquid, etc., the content of the sound-absorbing particles in the coating liquid can be 1-50% by mass, and may be 5-50% by mass.

From the viewpoints of the adhesiveness of the sound-absorbing particles and the strength of the composite layer, the content of the binder resin in the coating liquid can be 50-5000 parts by mass, or 10-1000 parts by mass relative to 100 parts by mass of the sound-absorbing particles. .

＜Use of sound-absorbing materials＞ The above-mentioned sound-absorbing material has excellent sound-absorbing characteristics in the low-frequency region. Therefore, the above-mentioned sound absorbing material can be suitably used in applications such as automobiles, railway vehicles, aircraft, ships, houses, and other buildings, electronic equipment, and precision machinery. The low-frequency region referred to here can be a region with a frequency below 1000 Hz, a region below 800 Hz, a region below 750 Hz, or a region below 500 Hz. [Example]

Hereinafter, the present invention will be explained in more detail through examples, but the present invention is not limited by these examples.

＜Preparation of materials＞ (Substrate layer) The base material layer shown in Table 1 was prepared.

[Table 1]

(Supporting base material) The supporting substrate shown in Table 2 was prepared.

[Table 2]

(Sound-absorbing particles) The following particles were prepared as sound-absorbing particles. The details of each particle are shown in Tables 3 and 4. Particle 1 (manufactured by JIOS AEROGEL CORPORATION, product name: AeroVa) Particle 2 (manufactured by AGC Si-Tech Co., Ltd., product name: SUNSPHERE-121) Particle 3 (manufactured by Sekisui Chemical Industry Co., Ltd., product name: TECHPOLYMER MBP-8) Particle 4 (manufactured by Sekisui Chemical Industry Co., Ltd., product name: TECHPOLYMER) Particle 5 (manufactured by 3M, product name: iM30K)

[table 3]

[Table 4]

(Coating liquid for forming composite layer) 10 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-30000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and 200 parts by mass of pure water , Acrylic emulsion (manufactured by DIC Co., Ltd., product name: DV-759EF, solid content 40 wt%) 250 parts by mass and 100 parts by mass of particles 1 are mixed to obtain coating liquid 1.

5 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-30000), 20 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and 350 parts by mass of pure water , Acrylic emulsion (manufactured by DIC Co., Ltd., product name: DV-759EF, solid content 40 wt%) 500 parts by mass, 100 parts by mass of particles 1, and 300 parts by mass of particles 5 are mixed to obtain coating liquid 2.

10 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-30000), 40 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and 700 parts by mass of pure water 1. Acrylic emulsion (manufactured by DIC Co., Ltd., product name: DV-759EF, solid content 40 wt%) 1000 parts by mass, 100 parts by mass of particles 1, and 900 parts by mass of particles 5 were mixed to obtain coating liquid 3.

50 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-30000), 200 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and 3500 parts by mass of pure water , Acrylic emulsion (manufactured by DIC Co., Ltd., product name: DV-759EF, solid content 40 wt%) 5000 parts by mass, 100 parts by mass of particles 1, and 4,500 parts by mass of particles 5 are mixed to obtain coating liquid 4.

15 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 530 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 270 Part by mass and 100 parts by mass of particles 1 were mixed to obtain coating liquid 5.

20 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 530 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 770 100 parts by mass of particles 1 were mixed to obtain coating liquid 6.

30 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 630 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 1750 100 parts by mass of particles 1 were mixed to obtain coating liquid 7.

10 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oils and Fats Co., Ltd., product name: MP-4000), 15 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 320 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 170 100 parts by mass of particles 2 were mixed to obtain coating liquid 8.

10 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oils and Fats Co., Ltd., product name: MP-4000), 15 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 320 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 170 100 parts by mass of particles 3 are mixed to obtain coating liquid 9.

10 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oils and Fats Co., Ltd., product name: MP-4000), 15 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 320 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 170 100 parts by mass of the particles 4 are mixed to obtain a coating liquid 10.

5 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 10 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 10 parts by mass, pure water 180 parts by mass, ethylene-vinyl chloride copolymer resin emulsion (manufactured by Sumika Chemtex Co., Ltd., product name: Sumielite 1010, solid content 50 wt%) 90 100 parts by mass of particles 5 were mixed to obtain coating liquid 11.

15 parts by mass of polyethylene oxide (manufactured by Sumitomo Chemical Co., Ltd., product name: PEO-3), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol (and Reagent manufactured by Ko Pure Chemical Industry Co., Ltd.) 30 parts by mass, 530 parts by mass of pure water, water-based epoxy ester resin (manufactured by DIC Co., Ltd., product name: WATERSOL EFD-5560, solid content 40 wt%) 270 parts by mass, 100 Part by mass of particles 1 are mixed to obtain coating liquid 12.

15 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and diethylene glycol ( Wako Pure Chemical Industries Co., Ltd. reagent) 30 parts by mass, pure water 530 parts by mass, silica emulsion (manufactured by Shin-Etsu Chemical Co., Ltd., product name: POLON-MF-56, solid content 40 wt%) 270 parts by mass , 100 parts by mass of particles 1 are mixed to obtain coating liquid 13.

15 parts by mass of hydroxypropyl methylcellulose (manufactured by Matsumoto Oil & Fat Co., Ltd., product name: MP-4000), 30 parts by mass of isopropanol (reagent manufactured by Wako Pure Chemical Industries, Ltd.), and 530 parts by mass of pure water 270 parts by mass of urethane emulsion (manufactured by Sanyo Chemical Industry Co., Ltd., product name: PERMARIN UA-368, solid content 50 wt%) and 100 parts by mass of particles 1 were mixed to obtain coating liquid 14.

(Adhesive layer) Prepare the following adhesive layer. Double-sided tape: 3M Japan Co., Ltd., PGD-100, thickness 0.12 mm Spray paste: 3M Japan Co., Ltd., spray paste 77

＜Production of sound-absorbing material＞ The sound absorbing material having the structure shown in each table was produced. For the composite layers 1-14, a thin film applicator is used to apply the coating liquids 1-14 on the substrate layer or the supporting substrate to a predetermined thickness, and the obtained coating film is dried at 60°C for 10~ 60 minutes.

Regarding the aspect in which the base material layers are joined via the composite layer, after the coating liquid is applied to the base material layer, the other base materials are laminated, and the heat treatment is performed under the above-mentioned conditions.

In the table, the sound absorption at normal incidence is measured in accordance with the following. The sound was incident from the layer side described in the upper part of the table. Device name: Type 4206 impedance tube (Brüel & Kjær) Measuring method: normal incidence sound absorption rate (according to JIS A 1405-1) Measuring range: 50～1600 Hz

[table 5]

[Table 6]

[Table 7]

[Table 8]

[Table 9]

[Table 10]

[Table 11]

[Table 12]

[Table 13]

[Table 14]

Figures 3 to 13 are graphs showing the normal incidence sound absorption rate of each Example and Comparative Example. It can be seen from the graphs that the sound-absorbing material of the embodiment has excellent sound-absorbing properties in the low-frequency region.

1: Composite layer 2: The first substrate layer 3: Support substrate 4: Composite sheet 10, 20: Sound-absorbing material

Figure 1 is a schematic cross-sectional view of a sound absorbing material according to an embodiment. Fig. 2 is a schematic cross-sectional view of a sound absorbing material of another embodiment. Fig. 3 is a graph showing the normal incidence sound absorption of Examples and Comparative Examples. Fig. 4 is a graph showing the normal incidence sound absorption rates of Examples and Comparative Examples. Fig. 5 is a graph showing the sound absorption rate at normal incidence in Examples and Comparative Examples. Fig. 6 is a graph showing the normal incidence sound absorption rates of Examples and Comparative Examples. Fig. 7 is a graph showing the normal incidence sound absorption rates of Examples and Comparative Examples. Fig. 8 is a graph showing the normal incidence sound absorption of Examples and Comparative Examples. Fig. 9 is a graph showing the normal incidence sound absorption rates of Examples and Comparative Examples. Fig. 10 is a graph showing the sound absorption rate at normal incidence in Examples and Comparative Examples. Fig. 11 is a graph showing the normal incidence sound absorption of Examples and Comparative Examples. Figure 12 is a graph showing the normal incidence sound absorption of the embodiment. Figure 13 is a graph showing the normal incidence sound absorption of the embodiment.

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1: Composite layer

2: The first substrate layer

10: Sound-absorbing material

Claims (18)

A sound-absorbing material, comprising: a first substrate layer with communicating holes, and a composite layer disposed on the first substrate layer; wherein the composite layer includes at least one of porous particles and hollow particles, And binder resin. A sound-absorbing material, comprising: a first substrate layer with communicating holes, and a composite sheet disposed on the first substrate layer; wherein the supporting substrate of the composite sheet is provided with a composite layer, the composite layer It includes at least one of porous particles and hollow particles, and a binder resin. The sound absorbing material according to claim 1 or 2, further comprising a second substrate layer having communicating holes under the first substrate layer. The sound-absorbing material according to any one of claims 1 to 3, wherein the composite layer is further provided with a third base material layer having continuous holes. The sound-absorbing material according to any one of claims 1 to 4, which has a thickness of 1-100 mm. The sound absorbing material according to any one of claims 1 to 5, wherein the specific surface area of the particles is 1 to 1000 m ² /g. The sound absorbing material according to any one of claims 1 to 6, wherein the average particle diameter D50 of the particles is 1 to 100 μm. The sound absorbing material according to any one of claims 1 to 7, wherein the bulk density of the particles is 0.05 to 1.00 g/cm ³ . The sound absorbing material according to any one of claims 1 to 8, wherein the density of the first base material layer is 0.005 to 0.30 g/cm ³ . The sound absorbing material according to any one of claims 1 to 9, wherein the ventilation resistance of the first base material layer is 0.003 to 0.500 kPa·s/m. A sound-absorbing improvement sheet is provided with a composite layer on a supporting base material, and the composite layer includes at least one of porous particles and hollow particles, and a binder resin. The sound absorption improvement sheet according to claim 11, wherein the specific surface area of the particles is 1 to 1000 m ² /g. The sound absorption improvement sheet according to claim 11 or 12, wherein the average particle diameter D50 of the particles is 1 to 100 μm. The sound absorption improvement sheet according to any one of claims 11 to 13, wherein the bulk density of the particles is 0.05 to 1.00 g/cm ³ . A coating solution for improving sound absorption, comprising: at least one of porous particles and hollow particles, a binder resin, and a liquid medium. The sound absorption improvement coating liquid according to claim 15, wherein the specific surface area of the particles is 1 to 1000 m ² /g. The sound absorption improvement coating liquid according to claim 15 or 16, wherein the average particle diameter D50 of the particles is 1 to 100 μm. The sound absorption improvement coating liquid according to any one of claims 15 to 17, wherein the bulk density of the particles is 0.05 to 1.00 g/cm ³ .

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