JP2021196551A - Soundproof material and manufacturing method thereof - Google Patents

Abstract

To provide a soundproof material that is highly soundproof and suitable for floor silencers for vehicles, dash silencers, etc., and a manufacturing method thereof.SOLUTION: There is provided a soundproof material 10 in which a skin material 30 is integrally molded on one surface of a polyurethane foam 20. The polyurethane foam 20 is a foam obtained from a polyurethane foam raw material, and a surface opposite to the skin material 30 is made of open cells. The skin material 30 has an impregnated layer 34 impregnated with the polyurethane foam raw material and cured on the integral side with the polyurethane foam, and air flow quantity (1) based on the JIS K6400-7B method: 2012 of the skin material 30 including the impregnated layer 34 is 5 to 80 cc/cm2/sec.SELECTED DRAWING: Figure 1

Description

The present invention relates to a soundproof material and a method for producing the same.

Conventionally, as a soundproofing material used as a floor silencer or the like placed on the floor of a vehicle, for example, there is a polyurethane foam in which a skin material is laminated on one side.

Patent Document 1 below describes a floor carpet for automobiles in which an impact material made of a skinless urethane resin foam is integrally formed on the back surface of the carpet to improve sound absorption and vibration damping properties.

Further, in Patent Document 2 below, there is a skin-integrated polyurethane foam mold product in which ^{the air permeability of the foam layer is 3.0 ft 3} / min or more and the hardness of the foam layer is 8 kg / 314 cm ^{2 or less (25% ILD).} Has been described.

Japanese Unexamined Patent Publication No. 10-71884 Japanese Unexamined Patent Publication No. 11-5499

In Patent Document 1, a ventilation blocking film or a thin non-woven fabric film is applied to the back surface of the carpet to prevent ventilation, and an impact material made of a skinless urethane resin foam is integrally formed to improve soundproofing. ..

The skin-integrated polyurethane foam molded product of Patent Document 2 is intended for good soundproofing in the low and medium frequency regions, and while improving the ventilation of the foam layer, the hardness is 8 kg / 314 cm ² or less (25). % ILD), which is installed in a vehicle and used, and when a load is applied to the skin material, there is a problem that it sinks because it is soft.

Further, in both Patent Document 1 and Patent Document 2, the soundproofing property of the polyurethane foam which is the sound source side (for example, the floor side of the vehicle) which is the noise incident side is examined, and the non-noise source side (the noise emission side) (which is the noise emission side). For example, the noise transmission of the carpet body and the skin material, which is the interior side of the vehicle, has not been examined. Furthermore, it was difficult to achieve both hardness and hardness to maintain the shape when a load was applied.

The present invention has been made in view of the above points, and an object of the present invention is to provide a soundproof material having a high soundproofing (sound absorbing) effect and a method for manufacturing the same, which is arranged between double walls having soundproofing materials on both sides. ..

The invention of claim 1 is a soundproof material in which a skin material is integrally molded on one side of a polyurethane foam, wherein the polyurethane foam is a foam obtained from a polyurethane foam raw material and is a surface opposite to the skin material. Is an open cell, and the skin material has an impregnated layer impregnated and cured by the polyurethane foam raw material on an integral side with the polyurethane foam, and the JIS K6400-7B method of the skin material including the impregnated layer: The air volume (1) based on 2012 is 5 to 80 cc / cm ² / sec.

The invention of claim 2 is characterized in that, in claim 1, the skin material is made of a fiber aggregate.

According to a third aspect of the present invention, the soundproofing material is 50% when a sample of 200 mm square × 20 mm in thickness is compressed to 80% of the thickness in a compression jig having a diameter of 80 mm at a test speed of 50 mm / min. It is characterized in that the compression hardness of the measured value at the time of compression is 500 N or more.

The invention of claim 4 is characterized in that, in any one of claims 1 to 3, the soundproofing material has a reverberation room sound absorption coefficient of 40% or more measured based on JIS A1409.

The invention of claim 5 is characterized in that, in any one of claims 1 to 4, the soundproofing material has a transmission loss of 42.2 dB or more at 1600 Hz measured based on JIS A1441-1: 2007. do.

The invention of claim 6 is characterized in that, in any one of claims 1 to 5, the soundproofing material is located between double walls having soundproofing materials on both sides.

In the invention of claim 7, the skin material is attached to the mold surface of either the upper mold or the lower mold of the foam molding mold, and the polyurethane foam raw material containing at least the polyol component, the catalyst, the foaming agent, and the isocyanate is foam-molded. In a method of producing a soundproof material in which the skin material is integrally molded on one side of the polyurethane foam by injecting it into a mold and foaming the polyurethane foam raw material, the skin material is made of a fiber aggregate and the polyurethane. The foam raw material can contain a polymer polyol, the polyurethane foam has an open cell on the opposite side to the polyurethane foam, and the polyurethane foam integrally molded with the polyurethane foam. The one-piece side has an impregnated layer impregnated with the polyurethane foam raw material and cured, and the air permeability (1) based on the JIS K6400-7B method: 2012 of the skin material containing the impregnated layer is 5 to 80 cc / cm. ^The soundproofing material is 2 / sec, and the measured value is the load at the time of 50% compression when a sample of 200 mm square × 20 mm in thickness is compressed to 80% of the thickness in a compression jig of φ80 mm at a test speed of 50 mm / min. It is characterized in that the compressed hardness is 500 N or more.

In the soundproofing material of the present invention, the skin material side is the non-sound source side, and the polyurethane foam side opposite to the skin material is the sound source side. In the soundproofing material of the present invention, since the surface of the polyurethane foam which is the sound source side is made of an open cell, the sound from the sound source is easily incident on the polyurethane foam, and further, it is considered to be the non-sound source side (that is, the sound outlet side). The skin material has an impregnated layer, and the air volume (1) of the skin material including the impregnated layer based on the JIS K6400-7B method: 2012 is 5 cc / cm ² / sec or more, so that good soundproofing ( Sound absorption) is obtained. Further, by performing slit processing on only the urethane foam in at least one direction in the vertical direction or the horizontal direction with a slit spacing of 100 mm square or less, the adhesion to the sound insulating material is improved and the vibration damping property is further improved.

The method for producing a soundproof material of the present invention has good soundproofing (soundproofing) and sufficient hardness, and is placed on the floor of a vehicle or the like and pressed by occupant's shoes or the like. In such a case, it is possible to manufacture a soundproof material with less sinking due to pressurization.

It is sectional drawing of the soundproof material of embodiment. It is sectional drawing which shows the process to the middle in the manufacturing method of a soundproof material. It is sectional drawing which shows the remaining process in the manufacturing method of a soundproof material. It is a table which shows the structure of an Example and the measurement result of a physical property, a soundproofing property (sound absorption property). It is a table which shows the structure of the comparative example, and the measurement result of the physical property, soundproofing property (sound absorption property).

Hereinafter, embodiments of the present invention will be described. The soundproofing material 10 of the embodiment shown in FIG. 1 is composed of a laminated body in which a skin material 30 is integrally molded on one side of a polyurethane foam 20. The soundproofing material 10 is suitable as a floor silencer or the like mounted on the floor of a vehicle as a soundproofing (sound absorbing) material between double walls having soundproofing materials on both sides, and is suitable as a skin material 30 in polyurethane foam 20. The surface on the opposite side is regarded as the sound source side and is placed on the sound source side member such as the floor of the vehicle. On the other hand, the skin material 30 side of the soundproof material 10 is regarded as the non-sound source side.

The polyurethane foam 20 is a foam obtained from a polyurethane foam raw material, and the skin layer 21 (the surface on the sound source side) opposite to the skin material 30 is an open cell.
The skin layer 21 (the surface on the sound source side) opposite to the skin material 30 in the polyurethane foam 20 may be slit-processed to be brought into close contact with the sound insulating material to improve the vibration damping property. The shape of the slit is not limited, and examples thereof include a slit in which a plurality of cut lines are formed in a grid pattern or in a parallel pattern.

The polyurethane foam 20 preferably has a density (JIS K7222: 2005) of 30 to 95 kg / m ³ and a thickness of 1 to 40 mm. If the density of the polyurethane foam 20 is too small, the hardness becomes low, and conversely, if the density becomes high, the hardness becomes heavy. Further, if the polyurethane foam 20 becomes too thin, the raw material cannot be filled and the urethane foam cannot be molded. On the contrary, if the polyurethane foam 20 becomes thick, the soundproofing material 10 becomes bulky and heavy.

The polyurethane foam raw material contains at least a polyol component, a catalyst, a foaming agent, and an isocyanate, and the polyol component may contain a polymer polyol.

The polyol component consists of a polyether polyol and a polymer polyol.
The polyether polyol is a polyhydric alcohol such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, shoe cloth, or ethylene to the polyhydric alcohol. Examples thereof include polyether polyols to which alkylene oxides such as oxides and propylene oxides are added.

As the polyether polyol, a polyether polyol having a functional group number of 2 to 8, a hydroxyl value of 20 to 168 mgKOH / g, and a number average molecular weight of 168 to 20000 is preferable. The ethylene oxide content (EO rate) of the polyether polyol is preferably 5 to 90%. The ethylene oxide content (EO rate) of the polyether polyol is the content of ethylene oxide units when the total amount of one raw material composition unit is 100% by weight.

The polymer polyol is obtained by polymerizing an ethylenically inert compound in a polyether polyol. By including the polymer polyol in the polyol component, the effects of improving the air permeability and the hardness can be obtained.
The polymer polyol preferably has a functional group number of 3 to 8, a hydroxyl value of 20 to 60 mgKOH / g, and a number average molecular weight of 2000 to 8000. The ethylene oxide content (EO rate) of the polymer polyol is preferably 3 to 50%. The ethylene oxide content (EO rate) of the polymer polyol is the content of ethylene oxide units when the total amount of one raw material composition unit is 100% by weight.
The weight ratio of the polymer polyol in the polyol component is preferably 20 to 100%, more preferably 50 to 100%, and the remaining ratio is the polyether polyol.

As the catalyst, those known for polyurethane foam can be used. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, tetramethylguanidine, imidazole compounds, tin catalysts such as stanus octoate and dibutyltin dilaurate, and phenylmercury propionate. Alternatively, a metal catalyst such as lead octate (also referred to as an organic metal catalyst) can be mentioned. A plurality of catalysts may be used in combination. The general amount of the catalyst is about 0.2 to 4 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the polyol component.

The foaming agent is not particularly limited, but water is preferable. The amount of water as a foaming agent is preferably about 2 to 10 parts by weight with respect to 100 parts by weight of the polyol component. Further, 3 to 7 parts by weight is more preferable.

The isocyanate may be an aromatic type, an alicyclic type, or an aliphatic type, and may be a bifunctional isocyanate having two isocyanate groups in one molecule, or three or more isocyanates in one molecule. It may be a trifunctional or higher functional isocyanate having an isocyanate group, or they may be used alone or in combination of two or more.

For example, as bifunctional isocyanates, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-phenylenediisocinate, p-phenylenediisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'- Fragrances such as diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, xylylene diisocyanate, 3,3'-dimethyl-4,4'-biphenylenediisonate, 3,3'-dimethoxy-4,4'-biphenylenediisocyanate Family-based, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, methylcyclohexane diisocyanate and other alicyclic ones, butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropi An aliphatic type such as range isocyanate, methylene diisocyanate, and lysine isocyanate can be mentioned.

Examples of trifunctional or higher functional isocyanates include 1-methylbenzol-2,4,6-triisocyanate, 1,3,5-trimethylbenzol-2,4,6-triisocyanate, and biphenyl-2,4,4'. -Triisocyanate, diphenylmethane-2,4,4'-triisocyanate, methyldiphenylmethane-4,6,4'-triisocyanate, 4,4'-dimethyldiphenylmethane-2,2', 5,5'tetraisocyanate, triisocyanate Phenylmethane-4,4', 4 "-triisocyanate, polypeptide MDI and the like can be mentioned. In addition, other urethane prepolymers can also be used. In addition, the isocyanate is not limited to one type, but one or more types. For example, one type of aliphatic isocyanate and two types of aromatic isocyanate may be used, two types of aromatic isocyanate and urethane prepolymer may be used, and three or more types of isocyanate may be used. The isocyanate index is preferably 90 to 130, more preferably 95 to 120. The isocyanate index is an index used in the field of polyurethane and is an active hydrogen group in a raw material (for example, a hydroxyl group of polyols). And the equivalent ratio of the isocyanate group of isocyanate to the active hydrogen group contained in the active hydrogen group such as water as a foaming agent) is a numerical value expressed as a percentage.

Examples of the components appropriately contained in the polyol component include a defoaming agent and an additive.
The defoaming agent may be any one used for polyurethane foam, and examples thereof include silicone-based defoaming agents, fluorine-containing compound-based defoaming agents, and known surfactants. The blending amount of the defoaming agent is preferably 0 to 2 parts by weight with respect to 100 parts by weight of the polyol component.

Examples of the additive include a communication agent, a cross-linking agent, a pigment, a filler, a flame retardant, an antioxidant, an ultraviolet absorber and the like.
Examples of the communicating agent include a polyether polyol having a high EO addition ratio, polyethylene glycol, a silicone defoaming agent having high air permeability (having defoaming property), and the like. When the communicating agent is blended, the amount of the communicating agent is preferably 0.5 to 20 parts by weight with respect to 100 parts by weight of the polyol. The communicating agent is not limited to one type, and two or more types may be used.
Examples of the cross-linking agent include glycerin, trimethylolpropane, 1,2,4-butanetriol, 2-methyl-2,3,4-butanetriol, triethanolamine, pentaerythritol and the like, and may be used alone or in combination of two or more. You may. Preferred cross-linking agents include glycerin, pentaerythritol, diethanolamine and the like as cross-linking agents having a functional group number of 2 to 4, a molecular weight of 92 to 136 and a hydroxyl value of 1066 to 1826 mgKOH / g, and may be used alone or in combination.
The blending amount of the cross-linking agent is preferably 1 to 6 parts by weight with respect to 100 parts by weight of the polyol component. The cross-linking agent may have an ethylene oxide content (EO rate) of more than 0%. For example, ethylenediamine-based (functional group: 4, molecular weight: 280, hydroxyl value 800 mgKOH / g, EO rate 40%), trimethylolpropane-based (functional group: 3, molecular weight: 183, hydroxyl value 920 mgKOH / g, EO rate 50%). ) Etc.

Examples of the pigment include carbon black and titanium oxide.
Examples of the filler include graphite, alumina, melamine and the like.

Specific examples of the flame retardant include halogenated diphenyl ethers such as degabromdiphenyl ether and octabromdiphenyl ether, and halogen compounds such as halogenated polycarbonate, such as antimony trioxide, antimony tetroxide, and antimony pentoxide. Inorganic compounds such as sodium pyroantimonate, aluminum hydroxide, triazine ring-containing compounds, metal hydroxides, phosphoric acid ester flame retardants, condensed phosphoric acid ester flame retardants, phosphate flame retardants, inorganic phosphorus flame retardants, dialkyl Examples thereof include phosphinates, silicone flame retardants, metal oxides, boric acid compounds, expansive graphite and the like.

Examples of the antioxidant include naphthylamine-based, diphenylamine-based, p-phenyldiamine-based, quinoline-based, hydroquinone derivatives, monophenol-based, thiobisphenol-based, hindered phenol-based, and phosphite ester-based agents.

Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and 5,5'-methylenebis (2-hydroxy-4-methoxybenzophenone). 2-Hydroxybenzophenones such as 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-ditritiary butylphenyl) -5-chlorobenzo. Triazol, 2- (2'-hydroxy-3'-third butyl-5'-methylphenyl) -5-chlorobenzotriazol, 2- (2'-hydroxy-5'-third octyl) Phenyl) benzotriazol, 2- (2'-hydroxy-3', 5'-dicumylphenyl) benzotriazol, 2,2'-methylenebis (4-thioctyl-6- (benzotriazolyl) phenol ), 2- (2'-Hydroxyphenyl) benzotriazoles such as 2- (2'-hydroxy-3'-third butyl-5'-carboxyphenyl) benzotriazole; phenylsalicylate, resorcinol monobenzoate, 2,4 -Di-tertiary butyl phenyl-3,5-di-tertiary butyl-4-hydroxybenzoate, 2,4-di-third amylphenyl-3,5-di-tertiary butyl-4-hydroxybenzoate, hexadecyl-3,5 -Phenylates such as di-tertiary butyl-4-hydroxybenzoate; substituted oxanilides such as 2-ethyl-2'-ethoxyoxanilide, 2-ethoxy-4'-dodecyloxanilide; ethyl-α-cyano- Cyano acrylates such as β, β-diphenyl acrylate, methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate; 2- (2-hydroxy-4-octoxyphenyl) -4,6- Bis (2,4-ditertiary butylphenyl) -s-triazine, 2- (2-hydroxy-4-methoxyphenyl) -4,6-diphenyl-s-triazine, 2- (2-hydroxy-4-propoxy) Examples thereof include triaryltriazines such as -5-methylphenyl) -4,6-bis (2,4-ditriary butylphenyl) -s-triazine.

Examples of the skin material 30 include fiber aggregates such as non-woven fabric and felt, and felt is particularly preferable from the viewpoint of light weight and soundproofing (sound absorption). The skin material of the embodiment consists of a two-layer non-woven fabric sheet composed of a first layer 31 and a second layer 33. The first layer 31 is on the opposite side of the polyletan foam 20, while the second layer 33 is on the side facing the polyurethane foam 20.

The layer of either the first layer 31 or the second layer 33 has a basis weight of 90 g / m ² or more, preferably 90 g / m ² or more and 500 g / m ² or less, having a fiber diameter of 2 to 4 d. The other layer has a basis weight of 100 g / m ² or more, preferably 100 g / m ² or more and 500 g / m ² or less. When the skin material 30 is configured in this way, since one layer is densely packed with fine fibers, it becomes difficult for the viscous polyurethane foam raw material to seep out from the skin material 30. One of the two layers is impregnated with an acrylic acid ester resin of 35 g / m ² or more, preferably 35 g / m ² or more and 100 g / m ^{2 or less.} In the layer impregnated with the acrylic acid ester resin, the fibers are filled with the acrylic ester resin, making it difficult for the polyurethane foam raw material to pass through the skin material 30, and further making it difficult for the polyurethane foam raw material to seep out. To impregnate the skin material 30 of the acrylic acid ester resin, an emulsion of the acrylic acid ester resin is applied to the surface of the skin material 30, or powder of the acrylic acid ester resin is sprayed on the surface of the skin material 30. It can be done by applying hot rollers or hot air.

By adjusting the basis weight of the first layer 31 and the second layer 33 and the impregnation of the acrylic acid ester resin, the air permeability of the skin material 30 including the impregnated layer 34 based on the JIS K6400-7B method: 2012 (1). Can be 5 to 80 cc / cm ² / sec. By setting the air permeability (1) of the skin material 30 including the impregnated layer 34 based on the JIS K6400-7B method: 2012 to 5 to 80 cc / cm ² / sec, the soundproofing (sound absorbing) property of the soundproofing material 10 is good. Can be made.

In a more preferable embodiment of the skin material 30, the second layer 33 on the polyurethane foam 20 side has a basis weight of 90 g / m ² or more having a fiber diameter of 2 to 4d, and 35 g / m ^{2 of an acrylic acid ester resin.} This is the impregnated mode. When the skin material 30 is configured in this embodiment, the second layer 33, which is in contact with the polyurethane foam raw material during the production of the soundproof material 10, is densely packed with fine fibers and is further ^{impregnated with 35 g / m 2} or more of acrylic acid ester resin. Therefore, the amount of the polyurethane foam raw material impregnated (soaked) into the second layer 33 is limited. Therefore, the impregnated layer 34 formed in the portion of the second layer 33 in contact with the polyurethane foam 20 by impregnation / curing of the polyurethane foam raw material becomes thin or coarse, and the air permeability of the second layer 33 can be ensured. ..

By setting the basis weight of the first layer 31 on the opposite side of the polyurethane foam 20 to 100 g / m ² or more, the impregnation of the urethane foam raw material into the first layer 31 is effectively prevented and the skin material 30 is ventilated. Sex can be ensured.
Further, it is preferable that the first layer 31 has a fiber diameter of 5 d or more to improve the wear resistance of the surface. The first layer 31 and the second layer 33 are integrated by adhesion or needle punching.

The soundproofing material 10 has a compression hardness measured by 50% compression when a sample of 200 mm square × 20 mm thickness is compressed to 80% of the thickness at a test speed of 50 mm / min using a compression jig of φ80 mm. It is preferably 500 N or more, and more preferably 650 to 1200 N. If the compression hardness of the soundproofing material 10 is too low, for example, when the upper surface of the soundproofing material 10 is pressed by the feet of an occupant, the pressed portion may sink, making it difficult to walk or the posture may become unstable. ..

The method for manufacturing the soundproofing material 10 will be described with reference to FIG. The soundproofing material 10 is manufactured by molding using a mold 40. The mold 40 includes a lower mold 41 and an upper mold 43, and the skin material 30 is attached to either the lower mold 41 or the upper mold 43. The skin material 30 is attached so that the first layer 31 faces the mold surface of one mold and the second layer 33 faces the inside of the mold. When the skin material 30 is attached to the upper mold 43, a locking means including a locking pin or the like for holding the skin material 30 detachably is provided on the mold surface of the upper mold 43.
In the illustrated example, the skin material 30 is attached to the mold surface of the upper mold 43 as shown in (2-1) of FIG.

Before attaching the skin material 30 to the mold surface of the mold 40, the mold release agent 38 is applied to the mold surface of the mold 40. The release agent 38 preferably contains a linear hydrocarbon wax so that the surface of the polyurethane foam 20 on the sound source side can be easily opened. Examples of the linear hydrocarbon wax include paraffin wax, Fishertroph wax, sazole wax, etc., such as a solvent-based mold release agent dispersed in an organic solvent, a water-based mold release agent dispersed in water using an emulsifier, and the like. Can be used.

After applying the mold release agent 38 to the mold surface of the mold 40 and attaching the skin material 30, the polyurethane foam raw material 20a is mixed and injected into the mold 40 as shown in FIG. 2 (2-2), and the mold 40 is closed. The polyurethane foam raw material 20a is foamed in the molding space between the second layer 33 of the skin material 30 and the mold surface of the lower mold 41 of the mold 40.

The polyurethane foam raw material 20a injected into the mold 40 fills the molding space between the second layer 33 of the skin material 30 and the mold surface of the lower mold of the mold 40 by foaming, and forms (2-3) in FIG. ), The polyurethane foam 20 is integrally formed with the skin material 30. At that time, a part of the polyurethane foam raw material 20a is impregnated into the second layer 33 of the skin material 30 and cured to form the impregnated layer 34 on the boundary side with the polyurethane foam 20.

After that, as shown in FIG. 3, the upper mold 43 is separated from the lower mold 41 to open the mold 40, and the soundproofing is made of a laminated body in which the skin material 30 is integrally molded on one side of the polyurethane foam 20 shown in FIG. Take out the material 10.

Using the polyurethane foam raw material composed of the formulations shown in FIGS. 4 and 5, a soundproof material having a size of 500 mm square and a thickness of 20 mm was produced by a mold foaming method using the mold 40 shown in FIGS. 2 and 3. The numerical values of each component in the formulations of FIGS. 4 and 5 indicate parts by weight. The mold was heated with warm water, and the lower mold 41 and the upper mold 43 were heated to 70 ° C. As the mold release agent, a linear hydrocarbon wax (product name: URH-520, manufactured by Konishi Co., Ltd.) was applied to the ^{mold surface by spray coating at 10 to 30 g / m 2.}

In Examples 1 to 5 and Comparative Examples 1 to 3, the skin material was attached to the mold surface of the upper mold 43 as shown in FIGS. 2 and 3 to manufacture a soundproof material. Comparative Example 4 is an example in which a felt having ^{a basis weight of 1200 g / m 2} is used by molding a material: synthetic fiber, cotton or the like with a thermoplastic resin or the like instead of polyurethane foam.

The components constituting the formulation shown in FIG. 4 are as follows.
-Polyol-1: Polyether polyol, number of functional groups 3.6, number average molecular weight 5500, hydroxyl value 31.5 mgKOH / g, EO rate 8%
Polyol-2: Polymer polyol, number of functional groups 3, number average molecular weight 5000, hydroxyl value 25 mgKOH / g, EO rate 13%, solid content concentration 30%
-Effervescent agent: water-Amine catalyst 1: Diethanolamine-Amine catalyst 2: aliphatic tertiary amine composition [bis (2-dimethylaminoethyl) ether / dipropylene glycol]
・ Defoaming agent: organically modified siloxane, product name; B8715LF2, EVONIC ・ Additives: polyether polyol, molecular weight 5000, number of functional groups 3, hydroxyl value 34 mgKOH, EO rate 70%
-Isocyanate 1 (ISO-1): Polymeric MDI, NCO% 31.5%
-Isocyanate 2 (ISO-2): 4,4'-MDI / urethane prepolymer = 75 to 85/15 to 25, NCO% 26.5%, EO rate 10%.

For each example and each comparative example, the thickness of the impregnated layer in the second layer, the appearance of the polyurethane foam, the hardness of the soundproofing material, the density of the polyurethane foam, the air permeability (2) of the skin layer 21 of the polyurethane foam and the central layer. The aeration amount (3), the aeration amount of the skin material including the impregnated layer (1), the reverberation room sound absorption coefficient, the reverberation room sound absorption coefficient of the polyurethane foam, and the transmission loss of the soundproof material were calculated or measured.

The thickness of the impregnated layer in the skin material 30 is measured from a soundproof material of 500 mm square x 20 mm thickness with a scanning electron microscope (SEM: manufactured by JEOL Ltd.) at a magnification of 35 times, and 5 points (including maximum and minimum). ) Was calculated from the average.
The appearance of the polyurethane foam is composed of cells with a maximum average diameter of 5 mm or less by visually observing the cross section of the polyurethane foam of soundproof material of 500 mm square x 20 mm thickness, and "◎" when there is no void larger than 5 mm, the maximum average. When a void having a diameter of more than 5 mm and 18 mm or less is present, the value is "○", and when a void having a maximum average diameter of 18 mm or more is present, the value is "x". The maximum average diameter is the average value of the major axis and the minor axis. When a large void is present, the hardness of the portion is greatly reduced, and the sinking is increased at the portion during pressurization.

To measure the hardness of the soundproofing material, a sample obtained by cutting a soundproofing material of 500 mm square x 20 mm in thickness into 200 mm square x 20 mm in thickness is placed so that the skin material is on the upper surface, and the compression speed is 50 mm / with a compression jig of φ80 mm. In min, compress until the displacement amount becomes 80% of the thickness (displacement amount of sample 16 mm, remaining thickness of sample 4 mm), and measure the load at 25% compression, 50% compression, and 75% compression at that time. Read as a value.
The evaluation of the hardness of the soundproof material is "◎" when the compression hardness is 1000N or more, "○" when the compression hardness is 500N or more and less than 1000N, and "○" when the compression hardness is less than 500N. It was set as "x".

The density of the polyurethane foam is measured from the cut piece obtained by cutting a soundproof material of 500 mm square × 20 mm in thickness into 100 mm square × 20 mm in thickness, and the skin material part (if the impregnated layer is present, the skin material part including the impregnated layer). ) Was removed, and the sample consisting of the remaining polyurethane foam was subjected to JIS K7222: 2005.

The number of cells of the polyurethane foam was measured according to JIS K 6400-1: 2004. As an evaluation of the polyurethane foam, the number of cells is evaluated as "x" for less than 10 cells, "○" for 10 or more and less than 20, and "◎" for 20 or more.

The air flow rate (2) of the skin layer of polyurethane foam and the air flow rate (3) of the central layer were measured from a cut piece obtained by cutting a soundproof material of 500 mm square x 20 mm thickness into 100 mm square x 20 mm thickness. 40 mm square or more x thickness to remove the part (the skin material part including the impregnated layer if there is an impregnated layer) and divide it into a skin layer (the surface side of the ureta foam) and a central layer (the central part with respect to the thickness). For the sample sliced to 3 mm, the measurement was performed based on JIS K 6400-7B method: 2012 with the surface closer to the surface side facing down. At this time, a clamp diameter of 5 cm ² (φ about 25 mm) was used. Further, in order to convert the thickness, the aeration amount (2) and (3) were calculated by the following formulas.
Aeration amount (2), (3) [(cc / cm ² / sec) · mm] = JIS measurement aeration amount [cc / cm ² / sec] × thickness of measurement site [mm]

The evaluation of the air permeability (2) of the skin layer ^{is "×" for less than 35 [(cc / cm 2} / sec) · mm], "△" for 35 or more and less than 50, "○" for 50 or more and less than 110, 110. The above is regarded as "◎", and the evaluation of the air volume (3) of the central layer is "×" for less than 50, "△" for 50 or more and less than 75, "○" for 75 or more and less than 135, and "◎" for 135 or more. And.
For the evaluation of the polyurethane foam as the air volume, the evaluation result is the worst evaluation among the evaluation of the number of cells and the evaluation of the air volume (2) (skin layer) and the air volume (3) (central layer). ..

The air permeability (1) of the skin material including the impregnated layer is measured by cutting a soundproof material of 500 mm square × 20 mm in thickness into 100 mm square × 20 mm in thickness from the cut material (when the impregnated layer is present). Cuts out the skin material part including the impregnated layer), installs the impregnated layer on the lower side of the sample consisting of the cut skin material part (the skin material part including the impregnated layer if the impregnated layer exists), and makes JIS. Based on the K6400-7B method: 2012, the measurement ^{was performed using a measurement area of 38 cm 2} [φ about 70 mm].

To measure the sound absorption coefficient of the reverberation room, four soundproofing materials 10 of 500 mm square x 20 mm thickness ^{were laid on the floor in the reverberation room (about 30 m 3} ), and JIS A 1409 was applied to the surface of the skin material (the surface on the non-sound source side). I went based on. Here, all the gaps between the samples and between the samples and the jig were sealed with aluminum tape. The reverberation room sound absorption coefficient is an average sound absorption coefficient obtained by averaging the measured values of the sound absorption coefficient of each frequency (500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300 Hz). The sound absorption coefficient of the reverberation room was used. The reverberation room sound absorption coefficient of the soundproof material 10 is an average sound absorption coefficient with respect to the surface on the skin material side including the impregnated layer.
The reverberation room sound absorption coefficient was evaluated as "◎" when it was 65% or more, "○" when it was 40% or more and less than 65%, and "×" when it was less than 40%.

The measurement of transmission loss was performed based on JIS A1441-1: 2007. The sound source reverberation room is 36 m ³ , the sound receiving and reverberation room is 20 m ³ , and the measurement area is 400 x 400 mm (0.16 m ² ). A rubber sheet (sound insulation material) with a thickness of 0.8 mm (sound insulation material) on the surface of the polyurethane foam on the sound source side of the sound source side of 500 mm square x 20 mm and a rubber sheet (sound insulation material) with a thickness of 1 mm on the skin material on the non-sound source side (1700 g / m ²⁾ ) Are piled up, the gap is further sealed with clay while the circumference of the soundproof material is fixed with a frame with a width of 50 mm, the sound is incident from the iron plate side as a sound source, and the central separation scattering point is 100 mm away from the surface of the rubber sheet. Numerical values at 1600 Hz were measured at four locations (100 mm pitch). “Structure A” of the transmission loss in FIGS. 4 and 5 has a configuration in which the urethane foam is in close contact with the iron plate, that is, the skin material is in close contact with the rubber sheet, and “Structure B” is the structure in which the skin material is attached to the iron plate, that is, the urethane foam is attached to the rubber sheet. It is a structure that is in close contact with.
The evaluation of the transmission loss was "◎" when it was 44.2 dB or more, "○" when it was 42.2 or more and less than 44.2 dB, and "x" when it was less than 42.2 dB.

Comprehensive evaluation of soundproofing material was performed for each Example and each Comparative Example. The comprehensive evaluation of the soundproofing material is the lowest of the hardness evaluation, the reverberation room sound absorption coefficient evaluation, and the transmission loss evaluation. For example, a comprehensive evaluation of "◎" when all of the hardness evaluation, reverberation room sound absorption coefficient evaluation, and transmission loss evaluation are "◎", and a comprehensive evaluation when at least one of the evaluations is "○" and the rest is "◎". "○", comprehensive evaluation "△" when at least one of the evaluations is "△" and the rest is "○" or "◎", at least one of the evaluations is "×" and the rest is "△" or "○" If it is "◎", the overall evaluation will be "x".

In Example 1, 30 parts by weight of polyol-1, 70 parts by weight of polyol 2, 5.10 parts by weight of foaming agent, 2.71 parts by weight of amine catalyst-1, and 0.39 parts by weight of amine catalyst-2. A polyurethane foam raw material having 0 parts by weight of a foam stabilizer, 0 parts by weight of an additive, ISO-1: ISO-2 = 22: 78 for isocyanate, and 105 for an isocyanate index was used, and the first layer was used as a skin material. It consists of 6d PET fiber, a grain size of 150 g / m ² , a second layer of 3d PET fiber, a grain size of 100 g / m ² , and an acrylic acid ester resin impregnated with 50 g / m 2, and the total grain size is 300 ^{g / m 2.} using the skin material of m ^2.

The results of Example 1 were that the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "◎", the hardness of the soundproofing material at 50% compression was 1110 N, the evaluation was "◎", and the density of the polyurethane foam was 55 kg /. m ³ , number of cells of polyurethane foam 58/25 mm, air permeability of polyurethane foam (2), (3) is 78 (cc / cm ² / sec) mm for skin layer, 287 (cc / cm ^{2) for central layer} /Sec) ・ mm, air permeability of the skin material including the impregnated layer (1) is 20.8cc / cm ² / sec, the reverberation room sound absorption coefficient of the soundproof material is 71%, evaluation "◎", transmission loss of the soundproof material “Structure A” was 49.2 dB, the evaluation was “◎”, and the overall evaluation was “◎”, and the soundproofing (sound absorption) property was good.

In Example 2, 30 parts by weight of polyol-1, 70 parts by weight of polyol 2, 5.76 parts by weight of foaming agent, 3.06 parts by weight of amine catalyst-1, and 0.45 parts by weight of amine catalyst-2. , Examples of the skin material using a polyurethane foam raw material having a foam stabilizer of 0.31 parts by weight, an additive of 2.27 parts by weight, an isocyanate of ISO-1: ISO-2 = 22: 78, and an isocyanate index of 105. This is an example using a skin material having the same composition as 1.

The results of Example 2 were that the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "◎", the hardness of the soundproofing material at 50% compression was 1400 N, the evaluation was "◎", and the density of the polyurethane foam was 55 kg /. m ³ , the number of cells of polyurethane foam 53/25 mm, the air volume of polyurethane foam (2), (3) is 39 (cc / cm ² / sec) mm for the ^{skin layer and 70 (cc / cm 2) for the central layer.} / Sec) · mm, air permeability of the skin material including the impregnated layer (1) is 11.7 cc / cm ² / sec, the reverberation room sound absorption coefficient of the soundproof material is 65%, evaluation "◎", transmission loss of the soundproof material “Structure A” was 47.2 dB, the evaluation was “◎”, and the overall evaluation was “◎”, and the soundproofing (sound absorption) property was good.

In Example 3, 30 parts by weight of polyol-1, 70 parts by weight of polyol 2, 5.88 parts by weight of foaming agent, 3.13 parts by weight of amine catalyst-1, and 0.45 parts by weight of amine catalyst-2. A polyurethane foam raw material having 0 parts by weight of a foam stabilizer, 9.84 parts by weight of an additive, ISO-1: ISO-2 = 0: 100 of isocyanate, and an isocyanate index of 105 was used as the skin material of Example 1. This is an example of using a skin material having the same composition.

As a result of Example 3, the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "○", the hardness of the soundproofing material at 50% compression was 650 N, the evaluation was "○", and the number of cells of the polyurethane foam was 64. / 25 mm, polyurethane foam density 55 kg / m ³ , polyurethane foam air permeability (2), (3) is 276 (cc / cm ² / sec) mm for the ^{skin layer and 352 (cc / cm 2) for the central layer.} / Sm) · mm, air permeability of the skin material including the impregnated layer (1) is 72 cc / cm ² / sec, soundproofing room sound absorption coefficient is 73%, evaluation is "◎", and transmission loss of the soundproofing material is "composition". A ”50.2 dB, evaluation“ ◎ ”, and overall evaluation“ 〇 ”, the appearance of the polyurethane foam was inferior to that of the other examples, but the soundproofing (sound absorption) property was good.

In Example 4, the polyol-1 is 0 parts by weight, the polyol2 is 100 parts by weight, the foaming agent is 6.41 parts by weight, the amine catalyst-1 is 3.33 parts by weight, and the amine catalyst-2 is 0.37 parts by weight. A polyurethane foam raw material having 0 parts by weight of a foam stabilizer, 2.47 parts by weight of an additive, ISO-1: ISO-2 = 0: 100 as an isocyanate, and an isocyanate index of 120 was used as the skin material of Example 1. This is an example of using a skin material having the same composition.

The results of Example 4 were that the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "◎", the hardness of the soundproofing material at 50% compression was 1024N, the evaluation was "◎", and the density of the polyurethane foam was 55 kg /. m ³ , number of cells of polyurethane foam 59/25 mm, air permeability of polyurethane foam (2), (3) is 36 (cc / cm ² / sec) mm for skin layer, 55 (cc / cm ^{2) for central layer} /Sec) · mm, air permeability of the skin material including the impregnated layer (1) is 8.23 cc / cm ² / sec, the reverberation room sound absorption coefficient of the soundproof material is 59%, evaluation "○", transmission loss of the soundproof material “Structure A” was 44.2 dB, the evaluation was “◎”, and the overall evaluation was “〇”, and the soundproofing (sound absorption) property was good.

In Example 5, the polyol-1 is 30 parts by weight, the polyol2 is 70 parts by weight, the foaming agent is 5.10 parts by weight, the amine catalyst-1 is 2.71 parts by weight, and the amine catalyst-2 is 0.39 parts by weight. , The foam-regulating agent is 0 parts by weight, the additive is 0 parts by weight, the isocyanate is ISO-1: ISO-2 = 22: 78, and the isocyanate index 105 is used as a polyurethane foam raw material, and the same configuration as in Example 1 is used as the skin material. This is an example of using the skin material of.

As a result of Example 5, the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "◎", the hardness of the soundproofing material at 50% compression was 1110 N, the evaluation was "◎", and the density of the polyurethane foam was 55 kg /. m ³ , the number of cells of polyurethane foam 32/25 mm, the air volume of polyurethane foam (2), (3) is 78 (cc / cm ² / sec) mm for the ^{skin layer and 287 (cc / cm 2) for the central layer.} /Sec) ・ mm, air permeability of the skin material including the impregnated layer (1) is 20.8cc / cm ² / sec, soundproofing room sound absorption coefficient is 71%, evaluation "◎", transmission loss of the soundproofing material The soundproof side and the non-sound source side are set in opposite directions, and the transmission loss of arranging the sound source on the skin material side is "Structure B" 47.2 dB, evaluation "◎", overall evaluation "◎", and soundproofing (sound absorption). Was good.

In Examples 1 to 5, when the air permeability (2) of the skin layer of the polyurethane foam or the air permeability (3) of the central layer becomes large, the value of the transmission loss of the soundproofing material tends to be high, and a high soundproofing effect is achieved. Will be obtained. In particular, in Example 3 in which the amount of air permeability (2) in the skin layer of the polyurethane foam or the amount of air permeability (3) in the central layer is the largest, the value of the transmission loss of the soundproofing material is the highest among Examples 1 to 5. It is high and has an excellent soundproofing effect.

In Comparative Example 1, a resin film made of polyethylene terephthalate resin having a thickness of 0.03 mm was adhered to the surface of the skin material of Examples 1 to 3 on the polyurethane foam side of the second layer with an acrylic urethane adhesive. Other than that, it has the same configuration as that of the first embodiment.

The results of Comparative Example 1 show that there is no impregnated layer (thickness is 0 mm), the appearance of the polyurethane foam is "◎", the hardness of the soundproof material when compressed at 50% is 1230 N, the evaluation is "◎", and the density of the polyurethane foam is 55 kg. / M ³ , number of cells of polyurethane foam 58/25 mm, air permeability of polyurethane foam (2), (3) is 64.2 (cc / cm ² / sec) · mm for skin layer, 267 (cc) for central layer / Cm ² / sec) · mm, air permeability of the skin material (1) is 0 cc / cm ² / sec, reverberation room sound absorption coefficient of the soundproof material is 30%, evaluation "x", transmission loss of the soundproof material is "Structure A" 41.2 dB, evaluation "x", overall evaluation "x". In Comparative Example 1, since the resin film is laminated on the second layer of the skin material, the skin material does not have an impregnated layer and air permeability, the reverberation room sound absorption coefficient of the skin material is low, and the soundproof material is soundproof (sound absorption). The sex was inferior to that of Examples 1 to 3. In Comparative Example 1, the air permeability (2) of the skin layer of the polyurethane foam and the air permeability (3) of the central layer are lower than those of Example 1, and since the skin material has no impregnated layer, it is soundproof. The value of the transmission loss of the material is low, and the soundproofing effect is low.

In Comparative Example 2, 30 parts by weight of polyol-1, 70 parts by weight of polyol 2, 4.35 parts by weight of foaming agent, 2.50 parts by weight of amine catalyst-1, and 0.37 parts by weight of amine catalyst-2. Examples of the skin material using a polyurethane foam raw material having a foam stabilizer of 0.50 parts by weight, an additive of 1.85 parts by weight, an isocyanate of ISO-1: ISO-2 = 100: 0, and an isocyanate index of 105. This is an example using a skin material having the same composition as 1.

The results of Comparative Example 2 were that the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "◎", the hardness of the soundproof material when compressed at 50% was 1280 N, the evaluation was "◎", and the density of the polyurethane foam was 55 kg /. m ³ , number of cells of polyurethane foam 74/25 mm, air permeability of polyurethane foam (2), (3) is 35 (cc / cm ² / sec) mm for skin layer, 43 (cc / cm ^{2) for central layer} /Sec) · mm, air permeability of the skin material including the impregnated layer (1) is 2.61 cc / cm ² / sec, the reverberation room sound absorption coefficient of the soundproof material is 34%, evaluation "x", transmission loss of the soundproof material "Structure A" was 39.2 dB, the evaluation was "x", and the overall evaluation was "x". In Comparative Example 2, the air permeability (2) and (3) of the polyurethane foam (skin layer, central layer) was small, and the air permeability of the skin material including the impregnated layer was 2.61 cc / cm ² / sec, which was extremely small. The reverberation room sound absorption coefficient of the skin material including the impregnated layer and the polyurethane foam and the transmission loss of the soundproof material were small, and the soundproof (sound absorption) property of the soundproof material was inferior to that of Examples 1 to 3.

In Comparative Example 3, 30 parts by weight of the polyol-1, 70 parts by weight of the polyol 2, 6.73 parts by weight of the foaming agent, 3.13 parts by weight of the amine catalyst-1, and 0.51 parts by weight of the amine catalyst-2. A polyurethane foam raw material having 0 parts by weight of a foam stabilizer, 25.46 parts by weight of an additive, ISO-1: ISO-2 = 0: 100 as an isocyanate, and an isocyanate index of 105 was used as the skin material of Example 1. This is an example of using a skin material having the same composition.

The results of Comparative Example 3 were that the thickness of the impregnated layer was 0.5 mm, the appearance of the polyurethane foam was "x", the hardness of the soundproofing material at 50% compression was 600 N, the evaluation was "○", and the density of the polyurethane foam was 55 kg /. m ³ , number of cells of polyurethane foam 22/25 mm, air permeability of polyurethane foam (2), (3) is 402 (cc / cm ² / sec) mm for skin layer, 625 (cc / cm ^{2) for central layer} / Sm) · mm, air permeability of the skin material including the impregnated layer (1) is 93 cc / cm ² / sec, the reverberation room sound absorption coefficient of the soundproof material is 40%, evaluation is "○", and the transmission loss of the soundproof material is "composition". A ”42.2 dB, evaluation“ ○ ”, and overall evaluation“ × ”. In Comparative Example 3, since the isocyanate was 100% of ISO2, the hardness of the soundproofing material was low, the polyurethane foam (skin layer, central layer) had a large air permeability (2) and (3), and the impregnated layer was formed. The air permeability of the included skin material (1) is as large as 93 cc / cm ² / sec, the reverberation room sound absorption coefficient of the skin material including the impregnated layer and the polyurethane foam and the transmission loss of the soundproof material are small, and the soundproofing (sound absorption) of the soundproofing material. The sex was inferior to that of Examples 1 to 3.

Comparative Example 4 is an example in which felt is used instead of polyurethane foam and laminated on the second layer of the skin material similar to Example 1.
The results of Comparative Example 4 were that there was no impregnated layer of the skin material, the hardness of the soundproofing material at 50% compression was 62 N, the evaluation was "x", the felt density was 55 kg / m ³ , and the felt air permeability (2). In (3), both the skin layer and the central layer were ^{evaluated as 817 (cc / cm 2} / sec) mm, the air permeability of the skin material (1) was 106 cc / cm ² / sec, and the reverberation room sound absorption coefficient of the soundproof material was 84%. “◎”, the transmission loss of the soundproof material was “Structure A” 48.2 dB, the evaluation was “◎”, and the overall evaluation was “×”. In Comparative Example 4, by using felt instead of polyurethane foam, the hardness of the soundproofing material became extremely small at 62N, the sinking due to pressing was large, and when used as a floor silencer or the like, the occupant's feet became It is buried in the soundproof material, making it difficult to move and the posture becomes unstable.

Comparative Example 5 is an example in which polyurethane foam is laminated on a second layer of a skin material similar to Example 1 using MF-8 (manufactured by Inoac Corporation) with the specifications of a separate skin.
The results of Comparative Example 5 show that there is no impregnated layer of the skin material, the hardness of the soundproof material at 50% compression is 36 N, the evaluation is "x", the density of MF-8 is 30 kg / m ³ , and the number of cells of the polyurethane foam is 67. Pieces / 25 mm, MF-8 air permeability (2), (3) is 3500 (cc / cm ² / sec) mm or more for both the skin layer and the central layer, and the skin material air permeability (1) is 108 cc / cm ² / Sec, the reverberation room sound absorption coefficient of the soundproof material was 16%, the evaluation was "x", the transmission loss of the soundproof material was "Structure A" 37.1 dB, the evaluation was "x", and the overall evaluation was "x". In Comparative Example 5, by using polyurethane foam with MF-8 in the specification of a separate skin, the air permeability (1), (2), and (3) are high, but the reverberation room sound absorption coefficient and soundproofing material of the polyurethane foam. Transmission loss is small. In addition, the hardness decreases, and when used as a floor silencer or the like, the occupant's feet are buried in the soundproof material, making it difficult to move and the posture becomes unstable.

As described above, the soundproofing material of the present invention has high soundproofing (sound absorbing) property, and is not limited to the soundproofing material for vehicles such as floor silencers of vehicles, and is suitable as a soundproofing material for, for example, buildings, industrial machines, home appliances, and the like.

10 Soundproofing material 20 Polyurethane foam (sound absorbing material)
20a Polyurethane foam raw material 21 Polyurethane foam skin layer 30 Skin material (sound absorbing material)
31 First layer 33 Second layer 34 Impregnated layer 40 Mold 41 Lower mold 43 Upper mold 38 Release agent

Claims (7)

In the soundproofing material in which the skin material is integrally molded on one side of the polyurethane foam,
The polyurethane foam is a foam obtained from a polyurethane foam raw material, and the surface opposite to the skin material is an open cell.
The skin material has an impregnated layer impregnated and cured by the polyurethane foam raw material on an integral side with the polyurethane foam.
JIS K6400-7B method of the skin material including the impregnated layer: A soundproofing material having an air permeability (1) of 5 to 80 cc / cm ^{2 / sec based on 2012.} The soundproofing material according to claim 1, wherein the skin material is made of an aggregate of fibers. The soundproofing material has a compression hardness of 500 N, which is a measured value of a load at 50% compression when a sample of 200 mm square × 20 mm in thickness is compressed to 80% of the thickness in a compression jig of φ80 mm at a test speed of 50 mm / min. The soundproofing material according to claim 1 or 2, wherein the soundproofing material is as described above. The soundproofing material according to any one of claims 1 to 3, wherein the soundproofing material has a reverberation room sound absorption coefficient of 40% or more measured based on JIS A1409. The soundproofing material according to any one of claims 1 to 4, wherein the soundproofing material has a transmission loss of 42.2 dB or more at 1600 Hz measured based on JIS A1441-1: 2007. The soundproofing material according to any one of claims 1 to 5, wherein the soundproofing material is located between double walls having soundproofing materials on both sides. A skin material is attached to the mold surface of either the upper mold or the lower mold of the foam molding mold, and a polyurethane foam raw material containing at least a polyol component, a catalyst, a foaming agent, and an isocyanate is injected into the foam molding mold to inject the polyurethane. In a method for producing a soundproof material in which the skin material is integrally molded on one side of a polyurethane foam by foaming a foam material.
The skin material is made of a fiber aggregate and is made of a fiber aggregate.
The polyurethane foam raw material can contain a polymer polyol and may contain.
The polyurethane foam has a skinless surface opposite to the skin material.
The skin material integrally molded with the polyurethane foam has an impregnated layer impregnated and cured by the polyurethane foam raw material on the integral side with the polyurethane foam.
The air volume (1) of the skin material containing the impregnated layer based on the JIS K6400-7B method: 2012 is 5 to 80 cc / cm ² / sec.
The soundproofing material has a compression hardness of 500 N, which is a measured value of a load at 50% compression when a sample of 200 mm square × 20 mm in thickness is compressed to 80% of the thickness in a compression jig of φ80 mm at a test speed of 50 mm / min. A method for manufacturing a soundproof material, which is characterized by the above.

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