WO2016103747A1 - Matériau absorbant le son - Google Patents

Matériau absorbant le son Download PDF

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Publication number
WO2016103747A1
WO2016103747A1 PCT/JP2015/060571 JP2015060571W WO2016103747A1 WO 2016103747 A1 WO2016103747 A1 WO 2016103747A1 JP 2015060571 W JP2015060571 W JP 2015060571W WO 2016103747 A1 WO2016103747 A1 WO 2016103747A1
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Prior art keywords
density layer
sound
absorbing material
low
material according
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PCT/JP2015/060571
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English (en)
Japanese (ja)
Inventor
裕介 河本
英利 毎川
哲弥 大塚
小原　知海
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日東電工株式会社
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Priority claimed from JP2015036125A external-priority patent/JP6518079B2/ja
Priority claimed from JP2015042140A external-priority patent/JP6577720B2/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2016103747A1 publication Critical patent/WO2016103747A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/88—Insulating elements for both heat and sound
    • E04B1/90—Insulating elements for both heat and sound slab-shaped
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials

Definitions

  • the present invention relates to a sound absorbing material.
  • Sound absorbing materials are widely used in houses, acoustic facilities, railway vehicles, aircraft and vehicles.
  • improving the sound-absorbing characteristics in the low-frequency region has been an ongoing problem, and various proposals have been made (for example, Patent Document 1).
  • Patent Document 1 In order to improve the sound absorption characteristics in the low frequency region, there is a problem that the sound absorbing material must be thickened, and the use and / or place of use of the sound absorbing material is limited. Therefore, there is a strong demand for a sound absorbing material that can achieve both excellent sound absorption characteristics in the low frequency region and thinning.
  • the present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a sound absorbing material that is thin and has excellent sound absorbing characteristics in a low frequency region.
  • the sound-absorbing material of the present invention has a low-density layer and a high-density layer, the Young's modulus of the low-density layer is 100,000 Pa or less, and the overall surface density is 1.8 kg / m 2 or more.
  • the thickness of the low density layer is 25 mm or less.
  • the low-density layer is composed of one selected from a porous material, a gel material, and a laminate thereof.
  • the low-density layer is composed of an ethylene / propylene / diene rubber open-cell foam.
  • the low-density layer is composed of 0.1 to 40 parts by weight of an organic foaming agent and 2 to 40 parts by weight of an inorganic foaming agent with respect to 100 parts by weight of ethylene / propylene / diene rubber. Parts by weight, and 2 to 40 parts by weight of a foaming aid.
  • the surface density of the high-density layer is 2 kg / m 2 or less.
  • the high-density layer has a thickness of 50 ⁇ m to 500 ⁇ m.
  • the high density layer is non-breathable.
  • the high-density layer is composed of one selected from the group consisting of a metal, a resin film, paper, a rubber sheet, and a laminate thereof.
  • the sound absorbing material has a total thickness of 26 mm or less.
  • the high-density layer is made of metal.
  • the sound-absorbing material has a sound absorption coefficient of 40% or higher for a sound of 1000 Hz or less. In another embodiment, the sound absorbing material has a sound absorption rate of sound of 600 Hz or less of 60% or more.
  • a combination of a low-density layer having a specific Young's modulus and a laminated structure of a low-density layer / a high-density layer having a specific surface density as a whole is thin and has an excellent low-frequency region. It is possible to realize a sound absorbing material having the sound absorbing characteristics.
  • A. 1 is a schematic sectional view of a sound absorbing material according to one embodiment of the present invention.
  • the sound absorbing material 100 of this embodiment includes a low density layer 10 and a high density layer 20.
  • the low density layer 10 and the high density layer 20 are laminated by any appropriate adhesive or double-sided tape (not shown).
  • “low density layer” means a layer having a relatively low density in the sound absorbing material
  • “high density layer” means a layer having a relatively high density, It is not based on a specific value of density.
  • the sound absorbing material 100 has a total thickness of preferably 26 mm or less, more preferably 20 mm or less, and further preferably 1 mm to 15 mm. According to the present invention, it is possible to realize a sound absorbing material having a very excellent low frequency region sound absorption characteristic (low sound absorption characteristic) regardless of such a very thin thickness.
  • the surface density of the sound absorbing material 100 is 1.8 kg / m 2 or more, preferably 1.8 kg / m 2 to 4 kg / m 2 . If the surface density of the sound-absorbing material is in such a range, it is possible to realize a very excellent low-frequency absorption characteristic even in applications where the thickness and weight are limited.
  • the density of the sound absorbing material 100 is preferably 1000 kg / m 3 or less, more preferably 400 kg / m 3 or less, still more preferably 250 kg / m 3 or less, and particularly preferably 170 kg / m 3 or less.
  • the density of the sound absorbing material 100 is preferably 100 kg / m 3 or more, and more preferably 120 kg / m 3 or more. If the density of the sound-absorbing material is in such a range, it is possible to realize a thin and very excellent bass-absorbing characteristic.
  • the sound absorbing material 100 has a sound absorption rate of sound of 600 Hz or less, preferably 60% or more, more preferably 70% or more, and further preferably 80% or more. As described above, according to the present invention, it is possible to realize a sound-absorbing material having such excellent low-frequency absorption characteristics regardless of a very thin thickness.
  • the sound absorption characteristics can be measured according to JIS A 1405-2.
  • the high-density layer 20 has a flame retardant function, and thus the sound absorbing material 100 has a flame retardant property.
  • the sound absorbing material 100 has a thermal diffusion parameter HD defined by the following formula of 0.005 (m 2 ) or more.
  • the thermal diffusion parameter HD is preferably 0.010 (m 2 ) or more, more preferably 0.012 (m 2 ) or more, and further preferably 0.015 (m 2 ) or more.
  • the upper limit of the thermal diffusion parameter HD is, for example, 0.3 (m 2 ).
  • the thermal diffusion parameter HD is optimized to such a range, thereby realizing an excellent difficulty while realizing a thin sound absorbing material. Both the flammability and the excellent sound absorption characteristics in the low frequency region can be achieved. This is an excellent effect that cannot be realized simply by selecting the thickness and thermal conductivity (substantially constituent material) of the low-density layer and the high-density layer.
  • the term [(thickness of high-density layer) ⁇ (thermal conductivity of high-density layer)] in the above formula means the ease of spreading of heat in the plane of the high-density layer, This means that the larger this is, the fewer the points that are too hot locally in the high-density layer.
  • the term [(thickness of low-density layer) / (thermal conductivity of low-density layer)] in the above formula means the difficulty in transferring heat in the thickness direction of the low-density layer. This means that the low density layer is hardly heated in the thickness direction.
  • the high-density layer can be hardly overheated locally and / or heat can hardly be transmitted in the thickness direction of the low-density layer.
  • the high-density layer is not easily overheated locally, and heat can be hardly transmitted in the thickness direction of the low-density layer, so that the low-density layer is locally heated and further heated. Combustion of the low density layer due to heat propagating through the low density layer can be satisfactorily prevented.
  • both the flame retardancy and the low-frequency sound absorption characteristics are better as the sound absorbing material is thicker,
  • By optimizing the diffusion parameters it is possible to achieve excellent flame retardancy and low sound absorption characteristics in a thin sound absorbing material.
  • the sound absorbing material 100 has a sound absorption rate of sound of 1000 Hz or less, preferably 40% or more, more preferably 50% or more, and further preferably 60% or more. And particularly preferably 70% or more. According to this embodiment, it is possible to achieve both excellent flame retardancy and such excellent bass absorption characteristics.
  • the low density layer 10 absorbs sound by converting vibration energy of sound waves into thermal energy. Since the low density layer has an open cell structure as described later, the resonance frequency can be shifted to the low wavelength side. As a result, a very excellent bass absorption characteristic can be realized.
  • the Young's modulus of the low density layer 10 is 100000 Pa or less, preferably 50000 Pa or less, and more preferably 30000 Pa or less.
  • the lower limit of the Young's modulus of the low density layer is, for example, 5000 Pa. If the Young's modulus of the low-density layer is in such a range, there is an advantage that sound energy can be satisfactorily converted by converting the energy of sound into the deformation energy of the sound absorbing material.
  • the Young's modulus can be measured, for example, using a dynamic viscoelasticity measuring apparatus (for example, “RSA-G2” manufactured by TA Instruments, Inc.) at a strain of 1%, a frequency of 1 Hz, room temperature, and a compression mode.
  • RSA-G2 dynamic viscoelasticity measuring apparatus
  • the thickness of the low density layer 10 is preferably 25 mm or less, more preferably 20 mm or less, and even more preferably 15 mm or less. On the other hand, the thickness of the low density layer 10 is preferably 1 mm or more, and more preferably 5 mm or more. In the embodiment of the present invention, it is possible to realize a very excellent bass absorption characteristic with such a thin thickness. By adopting a specific fine structure (typically a porous structure or a gel structure) using the materials described later as the low-density layer, it has achieved such excellent low-frequency absorption characteristics despite its thin thickness. can do.
  • a specific fine structure typically a porous structure or a gel structure
  • the surface density of the low density layer 10 is preferably 1 kg / m 2 to 3 kg / m 2 . If the surface density of the low-density layer is in such a range, the surface density of the entire sound-absorbing material can be set to a desired range by adjusting the surface density of the high-density layer. As a result, it is possible to obtain a sound absorbing material that is thin and has excellent low-frequency absorption characteristics.
  • the density of the low density layer 10 is preferably 50 kg / m 3 to 130 kg / m 3 . If the density of the low-density layer is in such a range, there is an advantage that sound energy can be satisfactorily converted into deformation energy of the sound absorbing material and the resonance frequency can be adjusted to 600 Hz or less.
  • the thermal conductivity of the low density layer 10 is preferably 0.2 W / m ⁇ K or less, more preferably 0.1 W / m ⁇ K or less, and even more preferably 0.05 W / m ⁇ K or less. .
  • the lower limit of the thermal conductivity is, for example, 0.02 W / m ⁇ K.
  • the thermal conductivity can be measured according to JIS 1412-2 (heat flow meter method). If the thermal conductivity of the low-density layer 10 is in such a range, good thermal diffusivity can be obtained while being thin. As a result, when imparting flame retardancy to the sound absorbing material, a sound absorbing material having excellent flame retardancy can be obtained.
  • any appropriate material that can realize the above Young's modulus and the above-described other characteristics as necessary can be used.
  • specific examples of such materials include porous materials, gel materials, and laminates thereof.
  • the porous material include nonwoven fabric, glass wool, rock wool, felt material, polymer foam, and polymer monolith.
  • a desired Young's modulus can be realized by adjusting the constituent material, the porosity, the pore size and / or the shape of the pore.
  • the gel material include silicone gel and urethane gel.
  • a desired Young's modulus or the like can be realized by adjusting a constituent material and / or a crosslinking density.
  • polymer foam examples include any appropriate material obtained by foaming a polymer material and imparting a porous structure.
  • specific examples of the polymer constituting the foam include polyurethane, polystyrene, polyolefin (for example, polyethylene and polypropylene), and ethylene / propylene / diene rubber (EPDM).
  • EPDM ethylene / propylene / diene rubber
  • Any appropriate structure may be employed as the porous structure depending on the purpose.
  • each bubble formed by foaming may have an independent closed cell structure, or may have an open cell structure in which at least a part of the bubbles are continuous.
  • an EPDM foam having an open cell structure hereinafter also referred to as an EPDM open cell foam
  • an EPDM open cell foam will be described as a representative example of the polymer foam.
  • the “open cell foam” means a foam having a structure in which at least some of the cells formed in the foam are continuous.
  • the open cell foam may have an open cell structure or may have a semi-continuous and semi-closed cell structure.
  • the open cell structure refers to a structure having an open cell rate of 100%.
  • the semi-continuous semi-closed cell structure refers to a structure in which the lower limit of the open cell ratio exceeds 0%, preferably 10% or more, and the upper limit is less than 100%, preferably less than 98%.
  • the average cell diameter of the open cell foam is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, and further preferably 200 ⁇ m or more.
  • the average cell diameter is preferably 1200 ⁇ m or less, more preferably 1000 ⁇ m or less, and still more preferably 800 ⁇ m or less.
  • an average cell diameter can be calculated
  • the material constituting the EPDM open-cell foam any appropriate material can be used as long as a desired thickness reduction is realized and a desired low-frequency sound absorption characteristic is obtained.
  • the EPDM open-cell foam is typically 0.1 to 40 parts by weight of an organic foaming agent, 2 to 40 parts by weight of an inorganic foaming agent, and 2 parts by weight of a foaming aid with respect to 100 parts by weight of EPDM. Parts to 40 parts by weight.
  • EPDM is a rubber obtained by copolymerization of ethylene, propylene, and dienes, and vulcanization with a vulcanizing agent is carried out by introducing unsaturated bonds by further copolymerizing dienes with the ethylene-propylene copolymer.
  • diene Any appropriate diene can be used as the diene. Specific examples include 5-ethylidene-2-norbornene, 1,4-hexadiene, and dicyclopentadiene.
  • organic foaming agent can be used as the organic foaming agent.
  • organic foaming agent include azo compounds, N-nitroso compounds, hydrazide compounds, semicarbazide compounds, fluorinated alkanes, and triazole compounds.
  • specific examples of the azo compound include azodicarboxylic acid amide (ADCA), barium azodicarboxylate, azobisisobutyronitrile (AIBN), azocyclohexylnitrile, and azodiaminobenzene.
  • ADCA azodicarboxylic acid amide
  • AIBN azobisisobutyronitrile
  • azocyclohexylnitrile azocyclohexylnitrile
  • azodiaminobenzene azodiaminobenzene.
  • N-nitroso compound examples include N, N ′ ′-dinitrosopentamethylenetetramine (DTP), N, N ′ ′-dimethyl-N, N ′ ′-dinitrosotephthalamide, and trinitrosotrimethyltriamine.
  • DTP N, N ′ ′-dinitrosopentamethylenetetramine
  • N, N ′ ′-dimethyl-N, N ′ ′-dinitrosotephthalamide examples include trinitrosotrimethyltriamine.
  • hydrazide compound examples include 4,4 ′ ′-oxybis (benzenesulfonylhydrazide) (OBSH), paratoluenesulfonylhydrazide, diphenylsulfone-3,3′-disulfonylhydrazide, 2,4-toluenedisulfonylhydrazide, Examples thereof include p, p-bis (benzenesulfonylhydrazide) ether, benzene-1,3-disulfonylhydrazide, and allylbis (sulfonylhydrazide).
  • OBSH 4,4 ′ ′-oxybis (benzenesulfonylhydrazide)
  • paratoluenesulfonylhydrazide diphenylsulfone-3,3′-disulfonylhydrazide
  • 2,4-toluenedisulfonylhydrazide examples thereof include
  • the semicarbazide compound include p-toluylenesulfonyl semicarbazide and 4,4 ′ ′-oxybis (benzenesulfonyl semicarbazide).
  • the fluorinated alkane include trichloromonofluoromethane and dichloromonofluoromethane.
  • Specific examples of the triazole compound include 5-morpholyl-1,2,3,4-thiatriazole.
  • an azo compound or an N-nitroso compound is used, and more preferably, azodicarboxylic acid amide (ADCA) or N, N′-dinitrosopentamethylenetetramine (DTP) is used.
  • ADCA azodicarboxylic acid amide
  • DTP N′-dinitrosopentamethylenetetramine
  • thermoly expandable fine particles in which a heat-expandable substance is enclosed in microcapsules may be used.
  • thermally expandable fine particles for example, commercially available products such as microspheres (trade name, manufactured by Matsumoto Yushi Co., Ltd.) may be used.
  • An organic foaming agent may be used independently and may use 2 or more types together.
  • any appropriate inorganic foaming agent can be used as the inorganic foaming agent.
  • the inorganic foaming agent include hydrogen carbonates such as sodium hydrogen carbonate and ammonium hydrogen carbonate, carbonates such as sodium carbonate and ammonium carbonate, nitrites such as sodium nitrite and ammonium nitrite, and hydrogen such as sodium borohydride. Examples thereof include boron halide salts and azides.
  • a bicarbonate is used, and more preferably, sodium bicarbonate is used.
  • An inorganic foaming agent may be used independently and may use 2 or more types together.
  • any appropriate combination can be adopted as the combination of the organic foaming agent and the inorganic foaming agent.
  • a combination of azodicarboxylic acid amide (ADCA) or N, N′-dinitrosopentamethylenetetramine (DTP) as the organic foaming agent and sodium hydrogen carbonate as the inorganic foaming agent can be used.
  • the blending ratio of the organic foaming agent and the inorganic foaming agent is preferably 20/1 to 0.1 / 1 by weight ratio, more preferably 9/1 to 1/1, and more preferably 6/1 to 1/1.
  • organic foaming agent exceeds the above blending ratio, the resulting foam may become closed cells.
  • the organic foaming agent is less than the above blending ratio, the foam may not be obtained due to outgassing.
  • EPDM open-cell foam is blended with the above-mentioned EPDM, organic foaming agent, inorganic foaming agent, foaming aid, filler, softener, vulcanizing agent, vulcanization accelerator, etc., and vulcanized and foamed. It can be obtained by (vulcanization foaming).
  • the EPDM open-cell foam may contain any appropriate additive depending on the purpose.
  • the additive include a reinforcing material, a vulcanization aid, a lubricant, a plasticizer, an antioxidant, an antioxidant, a pigment, a colorant, an antifungal agent, and a flame retardant.
  • vulcanization foaming may be performed by molding the admixture into a sheet shape by calendar molding or extrusion molding, or by vulcanization foaming, or by injection molding or press molding, It may be molded into a complicated shape and vulcanized and foamed.
  • the heating temperature in vulcanization foaming can be appropriately set according to the vulcanization start temperature of the blended vulcanizing agent, the foaming temperature of the blending foaming agent, and the like.
  • the vulcanization temperature is, for example, 450 ° C. or lower, preferably 100 ° C. to 350 ° C., and more preferably 120 ° C. to 250 ° C.
  • the vulcanized foam as described above softens the admixture, while the organic foaming agent and the inorganic foaming agent expand, and the vulcanization proceeds while forming a foamed structure. It is formed. Furthermore, by setting the vulcanization temperature as described above, in the vulcanization foaming, first, the organic foaming agent foams (primary foaming), and then the inorganic foaming agent foams at a temperature higher than the primary foaming. (Secondary foaming) Two-stage foaming is performed.
  • the foaming ratio (density ratio before and after foaming) of the obtained EPDM open-cell foam can be set preferably 10 to 30 times, more preferably 10 to 20 times.
  • the expansion ratio can be controlled by adjusting the blending ratio of the organic foaming agent and the inorganic foaming agent, the vulcanization foaming time, the temperature, and the like.
  • polymer monolith body examples include a silicone monolith body as described in JP-A-2014-61457. This publication is incorporated herein by reference in its entirety.
  • the surface density of the high-density layer 20 is preferably 2 kg / m 2 or less, more preferably 1.5 kg / m 2 or less, and even more preferably 1.2 kg / m 2 or less.
  • the surface density of the high density layer 20 is preferably at 0.2 kg / m 2 or more, more preferably 0.4 kg / m 2 or more. If the surface density is in such a range, the surface density of the entire sound-absorbing material can be set to a desired range even when the low-density layer as described above is used. As a result, it is possible to obtain a sound absorbing material that is thin and has excellent low-frequency absorption characteristics.
  • the density of the high density layer 20 is preferably 500kg / m 3 ⁇ 10000kg / m 3. If the density of the high-density layer is in such a range, there is an advantage that the surface density of the entire sound-absorbing material can be set to a desired range by using a thinner and cheaper high-density layer.
  • the thickness of the high-density layer 20 is preferably 10 ⁇ m to 1000 ⁇ m, more preferably 50 ⁇ m to 500 ⁇ m. If the thickness of the high-density layer is in such a range, a desired density and areal density can be realized as the entire sound-absorbing material.
  • the thermal conductivity of the high-density layer 20 is preferably 10 W / m ⁇ K to 500 W / m ⁇ K. If the thermal conductivity of the high-density layer is within such a range, the thermal diffusion parameter HD should be within a desired range using a thinner and cheaper high-density layer when imparting flame retardancy to the sound absorbing material. There is an advantage that can be.
  • the high-density layer As a material constituting the high-density layer, any appropriate material can be used as long as a desired thinning is realized and a desired bass absorption characteristic is obtained.
  • the high density layer is typically non-breathable. Since the high-density layer is non-breathable, there is an advantage that sound energy can be satisfactorily converted into sound-transforming energy and sound can be absorbed.
  • the air permeability can be measured by JIS P8117 (Gurley test method).
  • materials constituting the high-density layer include metals, resin films, paper, rubber sheets, and laminates thereof.
  • the metal include aluminum, stainless steel (SUS), iron, and copper.
  • the metal can typically be used as a metal foil.
  • the resin constituting the resin film include polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyolefin resins such as polyethylene (PE) and polypropylene (PP), Examples thereof include polycarbonate (PC), acrylic resin, polystyrene (PS), polyvinyl chloride (PVC), and acrylonitrile-butadiene-styrene copolymer resin (ABS).
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEN polyethylene naphthalate
  • PC polycarbonate
  • acrylic resin polystyrene
  • PVC polyvinyl chloride
  • ABS acrylon
  • the high-density layer 20 has a flame retardant function. That is, the high-density layer 20 not only contributes to the low-frequency sound absorption characteristics, but can impart flame retardancy to the entire sound-absorbing material (substantially protect the low-density layer from heat and prevent combustion). .
  • the high-density layer 20 by appropriately setting the combination of the high-density layer and the low-density layer that can realize the above-mentioned desired range of heat diffusion parameters, by stacking the high-density layer, flame retardancy and low-frequency absorption characteristics can be achieved. Both can be improved. Such an effect is particularly remarkable when the thickness of the low density layer is thin.
  • the high-density layer 20 can be typically made of metal.
  • Thickness Measured using a thickness gauge (2) Area density About the sound-absorbing material obtained in the examples and comparative examples, and the low-density layer (foam) and the high-density layer used in the examples and comparative examples, these were formed with a ⁇ 100 mm punching blade and a ⁇ 100 mm cylinder The weight of the sample punched out was measured with an electronic balance and determined by dividing by an area of 0.00785 (m 2 ). Note that 0.00785 (m 2 ) is the area of a circle of ⁇ 100 mm. (3) Density The density was obtained by dividing the surface density obtained in (2) above by the thickness measured in (1) above.
  • Examples 21 to 30 and Comparative Examples 18 to 22 were evaluated as follows. Samples were produced in the same manner as described above from the sound absorbing materials obtained in the examples and comparative examples, the sound absorption rate in the frequency range of 100 Hz to 1000 Hz was measured, and the maximum sound absorption rate in the range was evaluated according to the following criteria. . ⁇ ... Sound absorption coefficient is 45% or more ⁇ ... Sound absorption coefficient is 40% or more and less than 45% ⁇ ...
  • the sound absorbing materials obtained in Examples 21 to 30 and Comparative Examples 18 to 22 were cut into 182 mm ⁇ 257 mm as samples, and the samples were held on a sample holding table inclined at 45 ° as shown in FIG.
  • the fuel container made of iron, 17.5 ⁇ ⁇ 7.1
  • the mounting table was made of a material having low thermal conductivity (cork in this case). 0.55 cc of pure ethyl alcohol was added as a fuel to the fuel container, ignited, and left to stand until the fuel was burned out. Flame retardancy was evaluated according to the following criteria.
  • Example 1 to 20 and Comparative Examples 1 to 17 The low-density layer and the high-density layer having the configuration shown in Table 1 were bonded together by the method shown in Table 1 to produce each sound absorbing material. The obtained sound absorbing material was subjected to the above evaluation. The results are shown in Table 1.
  • Table 1 for example, the description “sound absorption rate 0.8” indicates that the sound absorption rate is 80%.
  • SUS indicates stainless steel (SUS304H).
  • Al indicates aluminum (A1050P).
  • PET indicates “Sunroid PET Ace” manufactured by Sumitomo Bakelite.
  • Double-sided tape” indicates “No.
  • EH2200 represents “Eptosealer EH2200” manufactured by Nitto Denko Corporation
  • EC-100 represents “Eptosealer EC-100” manufactured by Nitto Denko Corporation
  • EC-200 represents “Eptosealer EC-200” manufactured by Nitto Denko Corporation.
  • EE1000 indicates “Epto Sealer EE1000” manufactured by Nitto Denko Corporation
  • EV1000 indicates “Epto Sealer EV1000” manufactured by Nitto Denko Corporation, and “No.
  • Nitto Denko's “Eptosealer EH-2200” is used as the low-density layer
  • aluminum (A1050P) foil is used as the high-density layer
  • these are affixed via double-sided tape (“AS-1302-P12” from Nitto Denko)
  • a sound absorbing material was produced.
  • a sound absorbing material was produced by combining a low density layer and a high density layer having thicknesses as shown in Table 2. The obtained sound absorbing material was subjected to the above evaluation. The results are shown in Table 2.
  • the sound absorbing material of the example of the present invention is remarkably superior in the maximum sound absorption rate of sound of 600 Hz or less as compared with the sound absorbing material of the comparative example. Further, as is apparent from Table 2, it can be seen that the sound absorbing material of the example of the present invention is excellent in both flame retardancy and low sound absorption characteristics by optimizing the heat diffusion parameter. From this, it is understood that both the flame retardancy and the low-frequency sound absorption characteristics are improved by arranging the high-density layer.
  • the sound absorbing material of the present invention can be suitably used for automobiles, railways, aircraft, home appliances, and mobile devices.

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  • Laminated Bodies (AREA)

Abstract

L'invention concerne un matériau absorbant le son qui est mince et présente d'excellentes caractéristiques d'absorption du son dans une plage de basses fréquences. Un matériau absorbant le son selon la présente invention comprend une couche de faible densité et une couche de haute densité. La couche de faible densité présente un module de Young inférieur ou égal à 100 000 Pa. Globalement, ce matériau absorbant le son présente une densité surfacique égale ou supérieure à 1,8 kg/m2. Un matériau absorbant le son selon un mode de réalisation de la présente invention a une épaisseur totale inférieure ou égale à 26 mm, tout en ayant un coefficient d'absorption du son égal ou supérieur à 60 % par rapport à des sons de 600 Hz ou moins.
PCT/JP2015/060571 2014-12-24 2015-04-03 Matériau absorbant le son WO2016103747A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2014260654 2014-12-24
JP2014-260654 2014-12-24
JP2015036125A JP6518079B2 (ja) 2015-02-26 2015-02-26 難燃性吸音材
JP2015-036125 2015-02-26
JP2015042140A JP6577720B2 (ja) 2015-03-04 2015-03-04 吸音材
JP2015-042140 2015-03-04

Publications (1)

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WO2016103747A1 true WO2016103747A1 (fr) 2016-06-30

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112669800A (zh) * 2020-12-26 2021-04-16 西北工业大学 一种具有高效吸声性能的薄膜-多孔材料复合结构
WO2021224500A1 (fr) * 2020-05-08 2021-11-11 Cruette Fabrice Dispositif d'absorption d'ondes sonores et vibratoires à l'émission comme à la transmission sur base de mélange contenant du silicone, application possible pour tout type de transducteur audio.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007156309A (ja) * 2005-12-08 2007-06-21 Swcc Showa Device Technology Co Ltd 吸音材
JP2013020003A (ja) * 2011-07-08 2013-01-31 Taisei Corp 吸音材
JP2014051561A (ja) * 2012-09-05 2014-03-20 Nitto Denko Corp 吸音材およびシール材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007156309A (ja) * 2005-12-08 2007-06-21 Swcc Showa Device Technology Co Ltd 吸音材
JP2013020003A (ja) * 2011-07-08 2013-01-31 Taisei Corp 吸音材
JP2014051561A (ja) * 2012-09-05 2014-03-20 Nitto Denko Corp 吸音材およびシール材

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021224500A1 (fr) * 2020-05-08 2021-11-11 Cruette Fabrice Dispositif d'absorption d'ondes sonores et vibratoires à l'émission comme à la transmission sur base de mélange contenant du silicone, application possible pour tout type de transducteur audio.
CN112669800A (zh) * 2020-12-26 2021-04-16 西北工业大学 一种具有高效吸声性能的薄膜-多孔材料复合结构

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