CN105538841A - Sound-insulating pad used inside automobile and preparation process of sound-insulating pad - Google Patents

Sound-insulating pad used inside automobile and preparation process of sound-insulating pad Download PDF

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Publication number
CN105538841A
CN105538841A CN201511027522.1A CN201511027522A CN105538841A CN 105538841 A CN105538841 A CN 105538841A CN 201511027522 A CN201511027522 A CN 201511027522A CN 105538841 A CN105538841 A CN 105538841A
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CN
China
Prior art keywords
sound
parts
insulating pad
absorbing layer
automobile
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Pending
Application number
CN201511027522.1A
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Chinese (zh)
Inventor
李守伦
李守衡
夏春火
潘国梁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WUHU XINYUAN SPONGE CO Ltd
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WUHU XINYUAN SPONGE CO Ltd
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Priority to CN201511027522.1A priority Critical patent/CN105538841A/en
Publication of CN105538841A publication Critical patent/CN105538841A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/18—Layered products comprising a layer of natural or synthetic rubber comprising butyl or halobutyl rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/003—Interior finishings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a sound-insulating pad used inside an automobile and a preparation process of the sound-insulating pad and belongs to the technical field of automobile interior articles. The sound-insulating pad used inside the automobile is formed by bonding a sound-absorbing layer and a sound-insulating layer with bonding glue, wherein the sound-absorbing layer is made of, by weight, 30-60 parts of bamboo charcoal fibers, 50-80 parts of fibrilia, 20-40 parts of polyester fibers and 10-30 parts of glass fibers. The sound-insulating pad used inside the automobile is formed by bonding two layers of materials, the sound-absorbing layer has the sound absorbing effect and is free of toxin and smell, resistant to water and damp and good in air permeability, the sound-insulating layer not only has the sound insulating effect but also has the effects of thermal insulation, dust isolating, sealing and shock absorption, the two layers are bonded together, sound generated by resonance of metal inside the automobile can be lowered, the audio environment inside the automobile can be effectively isolated from the outside, more quietness can be achieved inside the automobile, and the effect of sound equipment inside the automobile can be further improved.

Description

Automotive interior sound insulating pad and preparation technology thereof
Technical field
The present invention relates to automotive interior sound insulating pad and preparation technology thereof, belong to automotive trim articles for use technical field.
Background technology
Auto sound is the condition of the performance according to vehicle, corresponding road conditions, use, the grating etc. that the engine noise produced automobile, tire and road surface vibrative sympathetic response sound, compartment inner assembly produce because of gap or the aging power of being squeezed does careful process, to improve the comfortableness that automobile is taken.And the most effective method of sound insulation is exactly add sound insulating pad at vehicle key position at present, makes automobile not only sound insulation, but also effect that is heat insulation, dust-separation can be played.But mostly the sound insulating pad that automotive interior uses at present is common rubber blanket, although the effect of sound insulation really can be played, but really do not have good sound-absorbing effect, good sound-absorbing effect can eliminate the resonance of automobile metal, thus make audio environment in car more excellent.
Summary of the invention
The object of the invention is to solve the weak point that above-mentioned prior art exists, provide one not only can sound insulation, heat insulation, and there is automotive interior sound insulating pad and the preparation technology thereof of good sound-absorbing effect.
The present invention is achieved by the following technical solutions:
Automotive interior sound insulating pad, its special character is to adopt adhesive glue to be bonded by sound absorbing layer and puigging, and sound absorbing layer is made up of following raw material by weight ratio: bamboo-carbon fibre 30-60 part, flaxen fiber 50-80 part, polyester fiber 20-40 part, glass fibre 10-30 part; Puigging is made up of following raw material by weight ratio: acrylonitrile-butadiene rubber 40-80 part, alumina powder 20-40 part, silica flour 10-30 part, sulphur 0.3-0.8 part, di-o-tolylguanidine 0.2-0.6 part, dioctyl phthalate 0.1-0.4 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.2-0.4 part, chlorinated paraffin wax 1-3 part, antimony oxide 2-4 part, Celogen Az 0.2-0.5 part, sodium acid carbonate 0.1-0.3 part; Adhesive glue is made up of following raw material by weight ratio: silicone rubber adhesive 50-80 part;
Described automotive interior sound insulating pad, adopts adhesive glue to be bonded by sound absorbing layer and puigging, and sound absorbing layer is made up of the raw material of following optimal proportion by weight: bamboo-carbon fibre 50 parts, 60 parts, flaxen fiber, 30 parts, polyester fiber, 20 parts, glass fibre; Puigging is made up of the raw material of following optimal proportion by weight: acrylonitrile-butadiene rubber 60 parts, alumina powder 30 parts, silica flour 20 parts, 0.6 part, sulphur, di-o-tolylguanidine 0.4 part, dioctyl phthalate 0.2 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.3 part, chlorinated paraffin wax 2 parts, antimony oxide 3 parts, Celogen Az 0.3 part, sodium acid carbonate 0.2 part; Adhesive glue is made up of the raw material of following optimal proportion by weight: silicone rubber adhesive 70 parts;
The preparation technology of automotive interior sound insulating pad, its special character is to comprise the following steps:
(1) bamboo-carbon fibre, flaxen fiber, polyester fiber, glass fibre are mixed in proportion, carry out mixing combing by carding machine, obtain composite fibre;
(2) composite fibre of step (1) is divided into several parts, is laid into sheet, then the sheet composite fibre tiled in layer be stacked together, hot blast crosses stove, namely can be made into sound absorbing layer;
(3) acrylonitrile-butadiene rubber is prepared in proportion, put into banbury to plasticate 3-5 minute, add alumina powder, silica flour, dioctyl phthalate, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD), chlorinated paraffin wax, antimony oxide, Celogen Az, sodium acid carbonate again in banbury, mediate 5-8 minute, obtain mixture;
(4) mixture of step (3) is cooled to 35-40 DEG C, puts into mill, add sulphur, di-o-tolylguanidine, evenly mixing, thin-pass once goes out into thick 3mm film, obtains film;
(5) film of step (4) is cut corner, with evacuated flat panel vulcanizer heating mould to 150-180 DEG C, then the film cut out is put into die cavity, matched moulds makes puigging after carrying out sulfuration 80-120 second;
(6) be bonded together by the puigging silicone rubber adhesive of the sound absorbing layer of step (2) and step (5), dry in the air under natural environment 24-48 hour, and cutting is cut.
Automotive interior sound insulating pad of the present invention, employing double layer material is bonded, sound absorbing layer not only has the effect of sound-absorbing, and nonpoisonous and tasteless, waterproof and dampproof, good air permeability, puigging not only has the effect of sound insulation, but also has the effect of heat insulation, dust-separation, sealing, damping, be bonded together and not only can reduce the sound that in car, metal resonance produces, and effective isolated extraneous with the audio environment in car, allow in car quieter, can also the effect of sound equipment in lifting car further.
Detailed description of the invention
Below provide the specific embodiment of the present invention, be used for being described in further detail formation of the present invention.
Embodiment 1
The automotive interior sound insulating pad of the present embodiment, adopts adhesive glue to be bonded by sound absorbing layer and puigging, and sound absorbing layer is made up of following raw material by weight ratio: bamboo-carbon fibre 30 parts, 50 parts, flaxen fiber, 20 parts, polyester fiber, 10 parts, glass fibre; Puigging is made up of following raw material by weight ratio: acrylonitrile-butadiene rubber 40 parts, alumina powder 20 parts, silica flour 10 parts, 0.3 part, sulphur, di-o-tolylguanidine 0.2 part, dioctyl phthalate 0.1 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.2 part, chlorinated paraffin wax 1 part, antimony oxide 2 parts, Celogen Az 0.2 part, sodium acid carbonate 0.1 part; Adhesive glue is made up of following raw material by weight ratio: silicone rubber adhesive 50 parts.
Embodiment 2
The automotive interior sound insulating pad of the present embodiment, adopts adhesive glue to be bonded by sound absorbing layer and puigging, and sound absorbing layer is made up of following raw material by weight ratio: bamboo-carbon fibre 60 parts, 80 parts, flaxen fiber, 40 parts, polyester fiber, 30 parts, glass fibre; Puigging is made up of following raw material by weight ratio: acrylonitrile-butadiene rubber 80 parts, alumina powder 40 parts, silica flour 30 parts, 0.8 part, sulphur, di-o-tolylguanidine 0.6 part, dioctyl phthalate 0.4 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.4 part, chlorinated paraffin wax 3 parts, antimony oxide 4 parts, Celogen Az 0.5 part, sodium acid carbonate 0.3 part; Adhesive glue is made up of following raw material by weight ratio: silicone rubber adhesive 80 parts.
Embodiment 3
The automotive interior sound insulating pad of the present embodiment, adopts adhesive glue to be bonded by sound absorbing layer and puigging, and sound absorbing layer is made up of the raw material of following optimal proportion by weight: bamboo-carbon fibre 50 parts, 60 parts, flaxen fiber, 30 parts, polyester fiber, 20 parts, glass fibre; Puigging is made up of the raw material of following optimal proportion by weight: acrylonitrile-butadiene rubber 60 parts, alumina powder 30 parts, silica flour 20 parts, 0.6 part, sulphur, di-o-tolylguanidine 0.4 part, dioctyl phthalate 0.2 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.3 part, chlorinated paraffin wax 2 parts, antimony oxide 3 parts, Celogen Az 0.3 part, sodium acid carbonate 0.2 part; Adhesive glue is made up of the raw material of following optimal proportion by weight: silicone rubber adhesive 70 parts.
The preparation technology of the automotive interior sound insulating pad of above embodiment, comprises the following steps:
(1) bamboo-carbon fibre, flaxen fiber, polyester fiber, glass fibre are mixed in proportion, carry out mixing combing by carding machine, obtain composite fibre;
(2) composite fibre of step (1) is divided into several parts, is laid into sheet, then the sheet composite fibre tiled in layer be stacked together, hot blast crosses stove, namely can be made into sound absorbing layer;
(3) acrylonitrile-butadiene rubber is prepared in proportion, put into banbury to plasticate 4 minutes, add alumina powder, silica flour, dioctyl phthalate, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD), chlorinated paraffin wax, antimony oxide, Celogen Az, sodium acid carbonate again in banbury, mediate 7 minutes, obtain mixture;
(4) mixture of step (3) is cooled to 38 DEG C, puts into mill, add sulphur, di-o-tolylguanidine, evenly mixing, thin-pass once goes out into thick 3mm film, obtains film;
(5) film of step (4) is cut corner, with evacuated flat panel vulcanizer heating mould to 160 DEG C, then the film cut out is put into die cavity, matched moulds carries out sulfuration and makes puigging after 100 seconds;
(6) be bonded together by the puigging silicone rubber adhesive of the sound absorbing layer of step (2) and step (5), dry in the air under natural environment 36 hours, cutting is cut.
The automotive interior sound insulating pad of above embodiment, employing double layer material is bonded, sound absorbing layer not only has the effect of sound-absorbing, and nonpoisonous and tasteless, waterproof and dampproof, good air permeability, puigging not only has the effect of sound insulation, but also has the effect of heat insulation, dust-separation, sealing, damping, be bonded together and not only can reduce the sound that in car, metal resonance produces, and effective isolated extraneous with the audio environment in car, allow in car quieter, can also the effect of sound equipment in lifting car further.

Claims (3)

1. automotive interior sound insulating pad, it is characterized in that adopting adhesive glue to be bonded by sound absorbing layer and puigging, sound absorbing layer is made up of following raw material by weight ratio: bamboo-carbon fibre 30-60 part, flaxen fiber 50-80 part, polyester fiber 20-40 part, glass fibre 10-30 part; Puigging is made up of following raw material by weight ratio: acrylonitrile-butadiene rubber 40-80 part, alumina powder 20-40 part, silica flour 10-30 part, sulphur 0.3-0.8 part, di-o-tolylguanidine 0.2-0.6 part, dioctyl phthalate 0.1-0.4 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.2-0.4 part, chlorinated paraffin wax 1-3 part, antimony oxide 2-4 part, Celogen Az 0.2-0.5 part, sodium acid carbonate 0.1-0.3 part; Adhesive glue is made up of following raw material by weight ratio: silicone rubber adhesive 50-80 part.
2. automotive interior sound insulating pad according to claim 1, it is characterized in that adopting adhesive glue to be bonded by sound absorbing layer and puigging, sound absorbing layer is made up of the raw material of following optimal proportion by weight: bamboo-carbon fibre 50 parts, 60 parts, flaxen fiber, 30 parts, polyester fiber, 20 parts, glass fibre; Puigging is made up of the raw material of following optimal proportion by weight: acrylonitrile-butadiene rubber 60 parts, alumina powder 30 parts, silica flour 20 parts, 0.6 part, sulphur, di-o-tolylguanidine 0.4 part, dioctyl phthalate 0.2 part, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD) 0.3 part, chlorinated paraffin wax 2 parts, antimony oxide 3 parts, Celogen Az 0.3 part, sodium acid carbonate 0.2 part; Adhesive glue is made up of the raw material of following optimal proportion by weight: silicone rubber adhesive 70 parts.
3. the preparation technology of automotive interior sound insulating pad described in claim 1 or 2, is characterized in that comprising the following steps:
(1) bamboo-carbon fibre, flaxen fiber, polyester fiber, glass fibre are mixed in proportion, carry out mixing combing by carding machine, obtain composite fibre;
(2) composite fibre of step (1) is divided into several parts, is laid into sheet, then the sheet composite fibre tiled in layer be stacked together, hot blast crosses stove, namely can be made into sound absorbing layer;
(3) acrylonitrile-butadiene rubber is prepared in proportion, put into banbury to plasticate 3-5 minute, add alumina powder, silica flour, dioctyl phthalate, N-phenyl-N`-isopropyl-p-phenylenediamine (PPD), chlorinated paraffin wax, antimony oxide, Celogen Az, sodium acid carbonate again in banbury, mediate 5-8 minute, obtain mixture;
(4) mixture of step (3) is cooled to 35-40 DEG C, puts into mill, add sulphur, di-o-tolylguanidine, evenly mixing, thin-pass once goes out into thick 3mm film, obtains film;
(5) film of step (4) is cut corner, with evacuated flat panel vulcanizer heating mould to 150-180 DEG C, then the film cut out is put into die cavity, matched moulds makes puigging after carrying out sulfuration 80-120 second;
(6) be bonded together by the puigging silicone rubber adhesive of the sound absorbing layer of step (2) and step (5), dry in the air under natural environment 24-48 hour, and cutting is cut.
CN201511027522.1A 2015-12-30 2015-12-30 Sound-insulating pad used inside automobile and preparation process of sound-insulating pad Pending CN105538841A (en)

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CN201511027522.1A CN105538841A (en) 2015-12-30 2015-12-30 Sound-insulating pad used inside automobile and preparation process of sound-insulating pad

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106169360A (en) * 2016-09-13 2016-11-30 李聪 A kind of combined transformer
CN106674781A (en) * 2016-12-01 2017-05-17 重庆雨帝建材有限公司 Interior decoration board and producing technology thereof
CN107573608A (en) * 2017-08-28 2018-01-12 广德天运新技术股份有限公司 A kind of arrangements for automotive doors silencing pad for possessing electrostatic-proof function
CN107627677A (en) * 2017-08-28 2018-01-26 广德天运新技术股份有限公司 A kind of automotive interior sound insulation pad and manufacture method
CN109384977A (en) * 2018-09-06 2019-02-26 白玉梅 A kind of rubber and preparation method thereof with sound absorption function
CN114274521A (en) * 2021-12-15 2022-04-05 东风汽车集团股份有限公司 Processing method of sound absorption cotton, sound absorption cotton and wheel cover type sound absorption cotton

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201736923U (en) * 2010-06-23 2011-02-09 浙江吉利汽车研究院有限公司 Automotive front wall sound insulation pad

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201736923U (en) * 2010-06-23 2011-02-09 浙江吉利汽车研究院有限公司 Automotive front wall sound insulation pad

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106169360A (en) * 2016-09-13 2016-11-30 李聪 A kind of combined transformer
CN106674781A (en) * 2016-12-01 2017-05-17 重庆雨帝建材有限公司 Interior decoration board and producing technology thereof
CN107573608A (en) * 2017-08-28 2018-01-12 广德天运新技术股份有限公司 A kind of arrangements for automotive doors silencing pad for possessing electrostatic-proof function
CN107627677A (en) * 2017-08-28 2018-01-26 广德天运新技术股份有限公司 A kind of automotive interior sound insulation pad and manufacture method
CN109384977A (en) * 2018-09-06 2019-02-26 白玉梅 A kind of rubber and preparation method thereof with sound absorption function
CN114274521A (en) * 2021-12-15 2022-04-05 东风汽车集团股份有限公司 Processing method of sound absorption cotton, sound absorption cotton and wheel cover type sound absorption cotton
CN114274521B (en) * 2021-12-15 2023-10-03 东风汽车集团股份有限公司 Processing method of sound-absorbing cotton, sound-absorbing cotton and wheel cover type sound-absorbing cotton

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Application publication date: 20160504