CN105670082A - Sound absorption material and preparation process thereof - Google Patents

Sound absorption material and preparation process thereof Download PDF

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Publication number
CN105670082A
CN105670082A CN201610148770.XA CN201610148770A CN105670082A CN 105670082 A CN105670082 A CN 105670082A CN 201610148770 A CN201610148770 A CN 201610148770A CN 105670082 A CN105670082 A CN 105670082A
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foaming agent
sound
absorbing material
resin
stabilizer
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CN105670082B (en
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胡志伟
陈蓉
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Hubei Xiangyuan New Material Technology Inc
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Hubei Xiangyuan New Material Technology Inc
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/246—Intercrosslinking of at least two polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/28—Treatment by wave energy or particle radiation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/107—Nitroso compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/20—Ternary blends of expanding agents
    • C08J2203/204—Ternary blends of expanding agents of chemical foaming agent and physical blowing agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/10—Block- or graft-copolymers containing polysiloxane sequences
    • C08J2483/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A sound absorption material is prepared from, by weight, 70-90 parts of PE resin, 1-10 parts of foaming agent A, 1-10 parts of foaming agent B, 1-10 parts of foaming agent C, 1-5 parts of stabilizer, 1-5 parts of foaming accelerant and 5-20 parts of color master batch, wherein the foaming agent A is ADC foaming agent, the foaming agent B is DPT foaming agent, and the foaming agent C is sodium bicarbonate. In preparation, all the raw materials are mixed at a high speed according to the required ratio and then extruded and granulated, then irradiation crosslinking is conducted on the raw materials through an electron accelerator, and the raw materials are sent into a thermal drying machine to be foamed and formed. The sound absorption frequency range is expanded, and the sound absorption rate of expected frequency and low frequency is increased.

Description

A kind of sound-absorbing material and preparation technology thereof
Technical field
The invention belongs to sound-absorbing material technical field, be specifically related to a kind of sound-absorbing material and preparation technology thereof.
Background technology
When sound wave is in certain space (indoor or pipeline in) propagation, and when being incident to material or structure wall, having part acoustic energy to be reflected, another part is absorbed (including transmission). Due to this absorption characteristic, reflection of the acoustic energy is made to reduce, so that noise is minimized. This material with sound absorption characteristics and structure are called sound absorption material and structure. Sound-absorbing porous material sound absorption principle: having a large amount of micropore inside porous material, through each other between hole, hole is goed deep into material internal and communicated with the external world by surface. When sound wave incident to material surface, a part reflects away at material surface, and another part then penetrates into material internal, causes the air vibration in hole, due to the viscosity resistance of friction and air, acoustic energy is changed into heat energy and dissipates. The heat loss that conduction of heat between air and hole wall, fiber in aperture causes simultaneously also makes sound energy attenuation. Additionally, sound wave is after rigid plane reflects, returning to its surface through material, a part incides again material internal.
Conventional sound-absorbing material is usually present the problem that cold tolerance is not good, at low temperatures after life-time service, it may appear that the problem that acoustically effective declines.
Summary of the invention
The problem that the low temperature sound absorption efficiency that it is an object of the invention to overcome prior art to exist is not good, it is provided that a kind of sound-absorbing material being effectively improved low temperature sound absorption efficiency and preparation technology thereof.
For realizing object above, technical scheme is as follows:
A kind of sound-absorbing material, its raw material forms and weight part ratio is: PE resin 70～90, foaming agent A1～10, foaming agent B1～10, foaming agent C1～10, stabilizer 1～5, foamed promoter 1～5, Masterbatch 5～20, wherein, described foaming agent A is ADC foaming agent, described foaming agent B is DPT foaming agent, and described foaming agent C is sodium bicarbonate.
Described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
The preparation technology of a kind of described sound-absorbing material, comprises the following steps successively:
Step one, first PE resin, foaming agent A, foaming agent B, foaming agent C, stabilizer, foamed promoter and Masterbatch are added homogenizer in required ratio and mix to obtain compound, more described compound is sent in extruder carry out extruding, pelletize;
Compound after pelletize is carried out cross-linking radiation by step 2, first employing electron accelerator, then is sent in baking the affected part after applying some drugs machine to carry out foaming.
In described step one, mixing temperature is 60～80 DEG C, and incorporation time is 10～30min, extrusion, pelletize temperature be 100～150 DEG C;
In described step 2, irradiation dose is 4～8Mrad, and the temperature of foaming is 200～250 DEG C.
Described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
Compared with prior art, the invention have the benefit that
The raw material of a kind of sound-absorbing material of the present invention forms and weight part ratio is: PE resin 70～90, foaming agent A1～10, foaming agent B1～10, foaming agent C1～10, stabilizer 1～5, foamed promoter 1～5, Masterbatch 5～20, wherein, foaming agent A is ADC foaming agent, foaming agent B is DPT foaming agent, foaming agent C is sodium bicarbonate, the design adopts three kinds of different types of foaming agent simultaneously, and by the optimization of Recipe, make that there is inside sound-absorbing material different pore structures, not only expand sound absorption frequency range, and it is effectively increased expected frequency and low-frequency sound-absorbing rate, improve low temperature sound absorption efficiency. therefore, the present invention not only expands sound absorption frequency range, and improves low temperature sound absorption efficiency.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further detailed explanation.
A kind of sound-absorbing material, its raw material forms and weight part ratio is: PE resin 70～90, foaming agent A1～10, foaming agent B1～10, foaming agent C1～10, stabilizer 1～5, foamed promoter 1～5, Masterbatch 5～20, wherein, described foaming agent A is ADC foaming agent, described foaming agent B is DPT foaming agent, and described foaming agent C is sodium bicarbonate.
Described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
The preparation technology of a kind of described sound-absorbing material, comprises the following steps successively:
Step one, first PE resin, foaming agent A, foaming agent B, foaming agent C, stabilizer, foamed promoter and Masterbatch are added homogenizer in required ratio and mix to obtain compound, more described compound is sent in extruder carry out extruding, pelletize;
Compound after pelletize is carried out cross-linking radiation by step 2, first employing electron accelerator, then is sent in baking the affected part after applying some drugs machine to carry out foaming.
In described step one, mixing temperature is 60～80 DEG C, and incorporation time is 10～30min, extrusion, pelletize temperature be 100～150 DEG C;
In described step 2, irradiation dose is 4～8Mrad, and the temperature of foaming is 200～250 DEG C.
Described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
Principles of the invention illustrates as follows:
The invention provides a kind of sound-absorbing material and preparation technology thereof, not only increase the acoustic absorptivity in expected frequency range, and can also have high acoustic absorptivity in low frequency ranges. It uses scope widely, it is possible to meet use when labyrinth, and the material selected is environment-friendly materials, will not to using environment, with low cost, manufacturing cost can be saved.
Foaming agent:
Inside sound-absorbing material, the occupation rate of Different Pore Structures is different with the difference of sound absorption frequency requirement, for ensureing to obtain different pore structures inside plastic foam material, the present invention adopts three kinds of different types of foaming agent in conjunction with the characteristic of raw material simultaneously, to obtain the pore structure of required different proportion.
PE resin:
The present invention combine use material selection fusing point, melt and refer to suitable resin, the process requirements of this material can be met, being unlikely to the front section in processing affects follow-up processing because of raw material premature failure.
Step 2:
In composite material, major part raw material is resin material, impact by the molecular chain structure of resin material own, the network structure needed can be obtained before foaming by the structure of cross-linking radiation change strand, it is easy in follow-up foaming process the growth of cell wall, encase the gas that foaming agent generates, and then obtain the loose structure that we need.
Embodiment 1:
A kind of sound-absorbing material, its raw material forms and weight part ratio is: PE resin 70, foaming agent A1, foaming agent B1, foaming agent C1, stabilizer 1, foamed promoter 1, Masterbatch 5, wherein, described PE resin is Low Density Polyethylene, described foaming agent A is ADC foaming agent, and described foaming agent B is DPT foaming agent, and described foaming agent C is sodium bicarbonate, described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
The preparation technology of a kind of described sound-absorbing material, comprises the following steps successively:
Step one, first PE resin, foaming agent A, foaming agent B, foaming agent C, stabilizer, foamed promoter and Masterbatch is added in required ratio homogenizer mixes 10min at 80 DEG C to obtain compound, more described compound is sent in extruder extrude at 100～150 DEG C, pelletize;
Compound after pelletize is carried out cross-linking radiation by step 2, first employing electron accelerator, then is sent in baking the affected part after applying some drugs machine to carry out foaming at 200 DEG C, and wherein, described irradiation dose is 4Mrad.
Adopting the sound-absorbing material that this embodiment prepares is 0.63 at the sound-absorption coefficient of expected frequency 100～5000HZ, and the sound-absorption coefficient within the scope of low frequency 100～200HZ is 0.32.
Embodiment 2:
Step, with embodiment 1, is different in that:
The raw material of described sound-absorbing material forms and weight part ratio is: PE resin 90, foaming agent A10, foaming agent B10, foaming agent C10, stabilizer 5, foamed promoter 5, Masterbatch 20.
In described step one, mixing temperature is 60 DEG C, and incorporation time is 30min, extrusion, pelletize temperature be 100～150 DEG C;
In described step 2, irradiation dose is 8Mrad, and the temperature of foaming is 250 DEG C.
Adopting the sound-absorbing material that this embodiment prepares is 0.90 at the sound-absorption coefficient of expected frequency 100～5000HZ, and the sound-absorption coefficient within the scope of low frequency 100～200HZ is 0.40.
Embodiment 3:
Step, with embodiment 1, is different in that:
The raw material of described sound-absorbing material forms and weight part ratio is: PE resin 80, foaming agent A5, foaming agent B5, foaming agent C5, stabilizer 4, foamed promoter 3, Masterbatch 12.
In described step one, mixing temperature is 70 DEG C, and incorporation time is 25min, extrusion, pelletize temperature be 100～150 DEG C;
In described step 2, irradiation dose is 7Mrad, and the temperature of foaming is 220 DEG C.
Adopting the sound-absorbing material that this embodiment prepares is 0.82 at the sound-absorption coefficient of expected frequency 100～5000HZ, and the sound-absorption coefficient within the scope of low frequency 100～200HZ is 0.45.

Claims (5)

1. a sound-absorbing material, it is characterised in that:
The raw material of described sound-absorbing material forms and weight part ratio is: PE resin 70～90, foaming agent A1～10, foaming agent B1～10, foaming agent C1～10, stabilizer 1～5, foamed promoter 1～5, Masterbatch 5～20, wherein, described foaming agent A is ADC foaming agent, described foaming agent B is DPT foaming agent, and described foaming agent C is sodium bicarbonate.
2. a kind of sound-absorbing material according to claim 1, it is characterised in that: described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
3. the preparation technology of sound-absorbing material described in a claim 1, it is characterised in that:
Described preparation technology comprises the following steps successively:
Step one, first PE resin, foaming agent A, foaming agent B, foaming agent C, stabilizer, foamed promoter and Masterbatch are added homogenizer in required ratio and mix to obtain compound, more described compound is sent in extruder carry out extruding, pelletize;
Compound after pelletize is carried out cross-linking radiation by step 2, first employing electron accelerator, then is sent in baking the affected part after applying some drugs machine to carry out foaming.
4. the preparation technology of a kind of sound-absorbing material according to claim 3, it is characterised in that:
In described step one, mixing temperature is 60～80 DEG C, and incorporation time is 10～30min, extrusion, pelletize temperature be 100～150 DEG C;
In described step 2, irradiation dose is 4～8Mrad, and the temperature of foaming is 200～250 DEG C.
5. the preparation technology of a kind of sound-absorbing material according to claim 3 or 4, it is characterised in that:
Described PE resin is Low Density Polyethylene, and described stabilizer is the block copolymer of dimethyl polysiloxane and polyethers, and described foamed promoter is zinc salt.
CN201610148770.XA 2016-03-16 2016-03-16 A kind of sound-absorbing material and its preparation technology Active CN105670082B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109704724A (en) * 2018-08-27 2019-05-03 苏州谦合诚智能科技有限公司 A kind of porous sound absorption new material and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101012323A (en) * 2007-02-01 2007-08-08 徐晓冰 Polythene physics foaming material and preparing method thereof
CN101423632A (en) * 2007-10-29 2009-05-06 比亚迪股份有限公司 Composition for foaming material and foaming material
CN102174223A (en) * 2011-03-15 2011-09-07 常州大学 Flame-retardant foamed polyethylene material and preparation method thereof
CN102516623A (en) * 2011-11-30 2012-06-27 深圳市长园特发科技有限公司 High-temperature-resistant chemical crosslink polyethylene foam and preparation method thereof
CN103224662A (en) * 2013-05-14 2013-07-31 贵州师范大学 High-elasticity low-density polyethylene foaming composite material and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101012323A (en) * 2007-02-01 2007-08-08 徐晓冰 Polythene physics foaming material and preparing method thereof
CN101423632A (en) * 2007-10-29 2009-05-06 比亚迪股份有限公司 Composition for foaming material and foaming material
CN102174223A (en) * 2011-03-15 2011-09-07 常州大学 Flame-retardant foamed polyethylene material and preparation method thereof
CN102516623A (en) * 2011-11-30 2012-06-27 深圳市长园特发科技有限公司 High-temperature-resistant chemical crosslink polyethylene foam and preparation method thereof
CN103224662A (en) * 2013-05-14 2013-07-31 贵州师范大学 High-elasticity low-density polyethylene foaming composite material and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109704724A (en) * 2018-08-27 2019-05-03 苏州谦合诚智能科技有限公司 A kind of porous sound absorption new material and preparation method thereof

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