CN110066374A - A kind of compressor hush pipe - Google Patents

A kind of compressor hush pipe Download PDF

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Publication number
CN110066374A
CN110066374A CN201910274924.3A CN201910274924A CN110066374A CN 110066374 A CN110066374 A CN 110066374A CN 201910274924 A CN201910274924 A CN 201910274924A CN 110066374 A CN110066374 A CN 110066374A
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China
Prior art keywords
hush pipe
compressor
parts
mould
isocyanates
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Granted
Application number
CN201910274924.3A
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Chinese (zh)
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CN110066374B (en
Inventor
杜丹
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Guangzhou Northen New Materials Technology Co Ltd
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Guangzhou Northen New Materials Technology Co Ltd
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Priority to CN201910274924.3A priority Critical patent/CN110066374B/en
Publication of CN110066374A publication Critical patent/CN110066374A/en
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Publication of CN110066374B publication Critical patent/CN110066374B/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • 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
    • C08J9/0014—Use of organic additives
    • C08J9/0038—Use of organic additives containing phosphorus
    • 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
    • C08J9/12—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 physical blowing agent
    • C08J9/14—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 physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0083—Pulsation and noise damping means using blow off silencers
    • 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
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
    • 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
    • C08J2203/18—Binary blends of expanding agents
    • C08J2203/184—Binary blends of expanding agents of chemical foaming agent and physical blowing agent, e.g. azodicarbonamide and fluorocarbon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Compressor (AREA)

Abstract

The invention discloses a kind of compressor hush pipe, the raw material of the hush pipe is contained the following parts by weight: 100 parts of polyalcohol, 53~58 parts of isocyanates, 2~4 parts of silicone oil, 1~3 part of fire retardant, 0.5~1.5 part of mill base, 0.5~1.5 part of water and 0.2~0.8 part of kicker；The isocyanates is from skinning isocyanates.The acoustical behavior of the compressor hush pipe is excellent, is integrally formed and is easily installed, and by the assembly of hush pipe, can be effectively reduced the noise of compressor to external radiation, solves the problems, such as dusting, the mildew of traditional air conditioner compressor noise-reduction product.Noise reduction effect is good after compressor noise reduction barreling machine of the present invention, up to 4dB or more.

Description

A kind of compressor hush pipe
Technical field
The present invention relates to a kind of noise reduction parts, and in particular to a kind of compressor hush pipe.
Background technique
The people of requirement with to(for) quality of life is higher and higher, has become in the noise objective of household appliance technical field, product For a vital technical requirements.The noise level of household electronic products affects the purchase of consumer to a certain extent. Therefore extensive concern of the household electrical appliance noise increasingly by host producer.
Compressor is Main Noise Sources in household electrical appliance, therefore focuses in compressor the research of household electrical appliance noise more Noise control in terms of.
The noise source and composition of compressor are complex, the electromagnetism generated including structural noise, aerodynamic noise and motor Noise.In compressor noise control field, current main direction of studying is to carry out the optimization of structure to compressor to reduce to reach The purpose of noise, and the noise reduction in such a way that acoustic damping materials wrap up compressor, but in the research of many acoustic damping materials noise reductions In, the sound insulating layer and felts product for being all made of sheet class are combined, in one group of acoustic hood, it usually needs two pieces or two Product more than part carries out package compressor and achievees the effect that noise reduction, and most of product, which passes through, the processes such as cuts, is bonded and sews, Production model falls behind, and installation must rely on manual assembly, inefficiency.
Compressor periphery is hot and humid environment, and traditional felts are hygroscopic and aging causes acoustical behavior to decline and produce Fecula and mildew.
In conclusion how to design a kind of novel noise reduction product, is meeting noise reduction requirement while improving the production of product And service efficiency, become acoustical material and product technology personnel's urgent problem to be solved.
Summary of the invention
A kind of compressor hush pipe is provided it is an object of the invention to overcome the shortcomings of the prior art place.
To achieve the above object, the technical scheme adopted by the invention is as follows: a kind of compressor hush pipe, including from skinning surface layer With foaming microporous layers, foamed using the raw material comprising isocyanates and polyalcohol.
The material of compressor hush pipe of the present invention, which is selected as, can be achieved to foam from the isocyanates and polyalcohol of skinning It forms,
The material of compressor hush pipe of the present invention, which is selected as, can be achieved to foam from the isocyanates and polyalcohol of skinning It forms, obtained hush pipe density is 60-100kg/m3, the structural schematic diagram of compressor hush pipe section as shown in Figure 1, by It is constituted from skinning surface layer 1 and foaming microporous layers 2.The foaming microporous layers of hush pipe are mainly used for inhaling compressor high-frequency noise It receives, sound absorption principle is sound wave in sound-absorbing porous material, because of friction and viscosity resistance, thermal energy consumption can be converted by sound and is dissipated, To achieve the purpose that sound absorption；The skin portion of hush pipe is one layer of flexible film simultaneously, and most of low-frequency noise is equal For vibration noise, when low-frequency noise is transmitted on hush pipe.The vibration of sound wave drives the vibration of epidermis, has bullet with epidermis Property, vibration acoustic makes epidermis generate damped motion, and the wriggling of epidermis interior molecules causes molecular friction, acoustic wave energy conversion point Energy in sub, to achieve the purpose that noise reduction.In addition, the skinning structure on hush pipe surface, prevents product water suction mildew, ensure that production Quality, and more preferably acoustical behavior is provided, it can be adapted for high humidity environment.
As the preferred embodiment of compressor hush pipe of the present invention, the raw material of the hush pipe includes following weight Part component: 100 parts of polyalcohol, 53~58 parts of isocyanates, 2~4 parts of silicone oil, 1~3 part of fire retardant, 0.5~1.5 part of mill base, 0.5~1.5 part and 0.2~0.8 part of kicker of water；Polyalcohol is polyether polyol, and the isocyanates is diphenylmethyl Alkane diisocyanate.By inventor's repetition test the study found that using the pure and mild methyl diphenylene diisocyanate of polyether polyols It is best to react the erasure effect from skinning material obtained, and noise reduction effect can be made under mild conditions under above-mentioned formula The excellent noise reduction cylinder material of fruit.As the preferred embodiment of compressor hush pipe of the present invention, the fire retardant is phosphoric acid Three (2- chloropropyl) esters.
As the preferred embodiment of compressor hush pipe of the present invention, the kicker is a fluorine dichloromethane Alkane.
As the preferred embodiment of compressor hush pipe of the present invention, the raw material of the hush pipe includes following weight The component of part: 100 parts of polyalcohol, 55 parts of isocyanates, 3 parts of silicone oil, 2 parts of fire retardant, 1 part of mill base, 1 part of water and kicker 0.5 part.There is best noise elimination effect and dampproof effect using hush pipe made of said ratio.
As the preferred embodiment of compressor hush pipe of the present invention, the preparation method packet of the compressor hush pipe Include following steps:
(1), release agent is coated on the surface that mold is contacted with the raw material of hush pipe；
(2), it will foam, cure in the material injecting mould of hush pipe；
(3), it is opened, takes out product, obtain the compressor hush pipe.
After the raw material of the hush pipe is foamed in mold, obtained product is an entirety, and obtained product is i.e. It can directly be set on compressor after mounting, it is efficiently convenient, it can be achieved that Automated assembly, on subsequent assembly without influence.
As the preferred embodiment of compressor hush pipe of the present invention, the mold include left mould, right mould, upper mold and Mold core, the left mould, right mould, upper mold are connected with mold core by being detachably connected component；The left mould and right mould are adapted, described Gap between Zuo Mo, right mould, upper mold and mold core forms the type chamber of molding hush pipe.
When foaming inclosed molds, the left mould, right mould and upper mold closure connection form tubular structure, and hush pipe is in the intracavitary shape of type At；When die sinking, by the connection disassembling between left mould, right mould and upper mold, molding hush pipe is taken out from mold core, can be fitted When deburring is to get the hush pipe.Processing is opened by the way of above-mentioned " three-part pattern ", the hush pipe shape can realize multiplicity Change, it is only necessary to according to usable space, attached pipeline structure designs mold cavity size and structure, without considering that result is buckled to, It can be integrally formed, realize fully wrapped around outside the noise source of required package.Due to the integral design using above-mentioned mold Method makes compressor hush pipe in addition to pipeline tapping, remaining position is integral sealing design, reduces leakage sound, therefore the compression Machine hush pipe can have outstanding acoustic efficiency.
As the preferred embodiment of compressor hush pipe of the present invention, the compressor hush pipe with a thickness of 15~ 20mm.It can guarantee that hush pipe has preferable erasure effect when the thickness, and cost is relatively low.
As the preferred embodiment of compressor hush pipe of the present invention, in the step (2), the foaming, curing Condition are as follows: 28~32 DEG C of material temperature, 42~46 DEG C of mould temperature.
The beneficial effects of the present invention are: the present invention provides a kind of compressor hush pipes.The compressor hush pipe Acoustical behavior is excellent, is integrally formed and is easily installed, and by the assembly of hush pipe, the noise that can be effectively reduced compressor is external Radiation, solves the problems, such as dusting, the mildew of traditional air conditioner compressor noise-reduction product.After compressor noise reduction barreling machine of the present invention Noise reduction effect is good, up to 4dB or more.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the compressor hush pipe section；
Fig. 2 is the structure diagram of the mold；Figure A is foaming inclosed molds state；Figure B is die opening state；
Wherein, 1, from skinning surface layer；2, foam microporous layers；3, Zuo Mo；4, right mould；5, upper mold；6, mold core.
Specific embodiment
To better illustrate the object, technical solutions and advantages of the present invention, below in conjunction with specific embodiment to the present invention It is described further.
Embodiment 1
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 55 parts of methyl diphenylene diisocyanate, 3 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 2 parts of ester, 1 part of mill base, 1 part of water and 0.5 part of monofluorodichloromethane.
The preparation method of compressor hush pipe of the present invention the following steps are included:
(1), release agent is coated on the surface that mold is contacted with the raw material of hush pipe；
(2), the raw material of hush pipe is inputted in mixing kettle by metering pump, is injected in mold and sends out after being sufficiently mixed uniformly Bubble, curing, injection speed are 120 Grams Per Seconds；
(3), it is opened, takes out product, obtain the compressor hush pipe.
The structure diagram of the mold is as shown in Fig. 2, include left mould 3, right mould 4, upper mold 5 and mold core 6, left 3 He of mould Right mould 4 is adapted, and the left mould 3, right mould 4 and upper mold 5 are detachably connected, between the left mould 3, right mould 4, upper mold 5 and mold core 6 Gap formed molding hush pipe type chamber.When foaming inclosed molds, the left mould 3, right mould 4 and the closure connection of upper mold 5 form tubular Structure (such as figure A), hush pipe is in the intracavitary formation of type；When die sinking, by the connection disassembling between left mould 3, right mould 4 and upper mold 5, from mould Molding hush pipe is taken out on core 6, schemes the direction that the arrow in A is die sinking, die opening state is as shown in panelb to get the noise reduction Cylinder.
Embodiment 2
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 53 parts of methyl diphenylene diisocyanate, 2 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 3 parts of ester, 0.5 part of mill base, 0.5 part of water and 0.2 part of monofluorodichloromethane.
The preparation method is the same as that of Example 1 for compressor hush pipe of the present invention.
Embodiment 3
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 58 parts of methyl diphenylene diisocyanate, 4 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 1 part of ester, 1.5 parts of mill base, 1.5 parts of water and 0.8 part of monofluorodichloromethane.
The preparation method is the same as that of Example 1 for compressor hush pipe of the present invention.
Embodiment 4
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 53 parts of methyl diphenylene diisocyanate, 3 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 2 parts of ester, 1 part of mill base, 1 part of water and 0.5 part of monofluorodichloromethane.
The preparation method is the same as that of Example 1 for compressor hush pipe of the present invention.
Embodiment 5
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 58 parts of methyl diphenylene diisocyanate, 3 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 2 parts of ester, 1 part of mill base, 1 part of water and 0.5 part of monofluorodichloromethane.
The preparation method is the same as that of Example 1 for compressor hush pipe of the present invention.
Embodiment 6
A kind of embodiment of compressor hush pipe of the present invention, compressor hush pipe described in the present embodiment is using following heavy The raw material of amount part is prepared: 100 parts of polyether polyol, 56 parts of methyl diphenylene diisocyanate, 3 parts of silicone oil, tricresyl phosphate (2- Chloropropyl) 2 parts of ester, 1 part of mill base, 1 part of water and 0.5 part of monofluorodichloromethane.
The preparation method is the same as that of Example 1 for compressor hush pipe of the present invention.
Comparative example 1
The raw material of compressor hush pipe described in this comparative example is with embodiment 1, the preparation method comprises the following steps: the shape that foams in a particular mold Foamed material is cut, be bonded and sewed and wrapped up compressor, obtains the compressor hush pipe by layered foamed material.
Embodiment 7
The structural schematic diagram of the section of compressor hush pipe described in Examples 1 to 6 and comparative example 1 as shown in Figure 1, by tying certainly Epidermis layer 1 and foaming microporous layers 2 are constituted.Sound Power Level of Noise Source reflecting surface is measured according to GB/T 3767-1996 acoustic sound pressure method The compressor test result of hush pipe described in the engineering method test application Examples 1 to 6 and comparative example 1 of top proximate freedom field is shown in Table 1.
Hush pipe erasure effect described in 1 Examples 1 to 6 of table
From the results shown in Table 1, the erasure effect of the material of compressor hush pipe of the present invention is preferable, can reach 3dB or more, wherein hush pipe erasure effect made from 1 material of embodiment is best, and logical using foaming mould of the present invention The erasure effect for crossing the compressor hush pipe that integrally formed method is formed is more preferable.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention And range.

Claims (9)

1. a kind of compressor hush pipe, which is characterized in that including from skinning surface layer and foaming microporous layers, using including isocyanates It foams with the raw material of polyalcohol.
2. compressor hush pipe as described in claim 1, which is characterized in that the raw material of the hush pipe includes following parts by weight Component: 100 parts of polyalcohol, 53~58 parts of isocyanates, 2~4 parts of silicone oil, 1~3 part of fire retardant, 0.5~1.5 part of mill base, water 0.5~1.5 part and 0.2~0.8 part of kicker；Polyalcohol is polyether polyol, and the isocyanates is diphenyl methane Diisocyanate.
3. compressor hush pipe as claimed in claim 2, which is characterized in that the fire retardant is tricresyl phosphate (2- chloropropyl) ester.
4. compressor hush pipe as claimed in claim 2, which is characterized in that the kicker is monofluorodichloromethane.
5. compressor hush pipe as claimed in claim 2, which is characterized in that the raw material of the hush pipe includes following parts by weight Component: 100 parts of polyalcohol, 55 parts of isocyanates, 3 parts of silicone oil, 2 parts of fire retardant, 1 part of mill base, 1 part of water and kicker 0.5 Part.
6. the compressor hush pipe as described in any one of Claims 1 to 5, which is characterized in that the system of the compressor hush pipe Preparation Method the following steps are included:
(1), release agent is coated on the surface that mold is contacted with the raw material of hush pipe；
(2), it will foam, cure in the material injecting mould of hush pipe；
(3), it is opened, takes out product, obtain the compressor hush pipe.
7. compressor hush pipe as claimed in claim 6, which is characterized in that the mold includes left mould, right mould, upper mold and mould Core, the left mould, right mould, upper mold are connected with mold core by being detachably connected component；The left mould and right mould are adapted, the left side Gap between mould, right mould, upper mold and mold core forms the type chamber of molding hush pipe.
8. compressor hush pipe as claimed in claim 6, which is characterized in that the compressor hush pipe with a thickness of 15~ 20mm。
9. compressor hush pipe as claimed in claim 6, which is characterized in that in the step (2), the foaming, the item cured Part are as follows: 28~32 DEG C of material temperature, 42~46 DEG C of mould temperature.
CN201910274924.3A 2019-04-04 2019-04-04 Compressor silencing tube Active CN110066374B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910274924.3A CN110066374B (en) 2019-04-04 2019-04-04 Compressor silencing tube

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Application Number Priority Date Filing Date Title
CN201910274924.3A CN110066374B (en) 2019-04-04 2019-04-04 Compressor silencing tube

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CN110066374B CN110066374B (en) 2020-06-30

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102898815A (en) * 2012-10-09 2013-01-30 烟台正海汽车内饰件有限公司 Soft and light PU foam plate for automobile engine sound insulating pad
CN104530375A (en) * 2014-10-31 2015-04-22 扬中市天正合成材料研究中心 Environment-friendly high-flame-retardant automotive engine hood composite material and preparation method thereof
CN109294216A (en) * 2018-08-31 2019-02-01 合肥开捷汽车科技有限公司 A kind of polyurethane is from skinning engine bonnet and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102898815A (en) * 2012-10-09 2013-01-30 烟台正海汽车内饰件有限公司 Soft and light PU foam plate for automobile engine sound insulating pad
CN104530375A (en) * 2014-10-31 2015-04-22 扬中市天正合成材料研究中心 Environment-friendly high-flame-retardant automotive engine hood composite material and preparation method thereof
CN109294216A (en) * 2018-08-31 2019-02-01 合肥开捷汽车科技有限公司 A kind of polyurethane is from skinning engine bonnet and preparation method thereof

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