CN104004324B - A kind of automobile fiber damping material and preparation method thereof - Google Patents
A kind of automobile fiber damping material and preparation method thereof Download PDFInfo
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Abstract
The invention provides a kind of automobile fiber damping material and preparation method thereof, belong to auto parts preparation field.Solve the problem of existing reinforcing sheet damping property difference.This damping material comprises isoprene-isobutylene rubber compound, epoxy resin, solidifying agent and all kinds of powder class fillers, isoprene-isobutylene rubber compound of the present invention has good damping capacity, ageing-resistant performance and high temperature performance, simultaneously, described isoprene-isobutylene rubber compound can be good with epoxy resin combination, not only can not reduce bending resistance and the shock resistance of fiber damping material, the effect of the vibration and noise reducing of damping material can also be increased.The present invention also provides a kind of preparation method of automobile fiber damping material, and the method technique is simple, raw material is easy to get, and the fiber damping material obtained not only has good bending resistance and shock resistance, and damping property have also been obtained raising.
Description
Technical field
The invention belongs to auto parts preparation field, be specifically related to a kind of automobile fiber damping material and preparation method thereof.
Background technology
At present, the continuing of global climate is warmed, and automobile emission is the large reason causing global warming and Greenhouse effect.Therefore the exhaust gas emission problem of automobile more and more receives publicity.Alleviate the weight of vehicle body, the average load reducing automobile has become a kind of method of effective energy-saving and emission-reduction.Fiber damping fin can increase the intensity of steel plate and SMC and not increase its weight, is therefore applied in the field such as automobile industry, electric utility widely.Most fiber damping fin forms by having the high molecular polymer of expansion viscosity, solidifying agent, glasscloth and interleaving paper in the market, can improve bending strength and the shock strength of steel plate.But the intensity that this reinforced gasket increases steel plate is not high, and there is no any effect on shockproof.
Summary of the invention
The object of the invention is the problem in order to solve existing reinforcing sheet damping property difference, and a kind of automobile fiber damping material and preparation method thereof is provided.
First the present invention provides a kind of automobile fiber damping material, and this damping material comprises according to weight parts:
Preferably, described isoprene-isobutylene rubber compound, according to weight parts, comprises
Preferably, the number-average molecular weight of described polyisobutene is 1000-3000.
Preferably, described rubber oil is paraffin oil.
Preferably, described anti-aging agent is amines antioxidants.
Preferably, described epoxy resin is bisphenol A type epoxy resin.
Preferably, described solidifying agent is Dyhard RU 100 or quadrol.
Preferably, the diameter of described glass microballon is 0.2-0.27mm.
Preferably, described polyethylene powder is Low Density Polyethylene powder.
The present invention also provides a kind of preparation method of automobile fiber damping material, comprising:
Reactor is warming up to 90-110 DEG C, adds epoxy resin, vacuumize 0.7-0.9MPa, open whipping appts, stirring velocity arranges revolution for 15-25 rev/min, stirs 20-40min, then stop stirring, add talcum powder, polyethylene powder and organobentonite, stirring velocity revolution 5-15 rev/min is set, be separated into 100 revs/min, stir 10-20 minute, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set,, rate of dispersion is constant, stirs 20-40min;
Add isoprene-isobutylene rubber compound in a kettle., stirring velocity revolution 8-12 rev/min is set, is separated into 100 revs/min, stirs 5-10min, open vacuum 0.7-0.9MPa, stir 5-15min;
Reactor temperature is down to 80-90 DEG C, then adds solidifying agent, stirring velocity revolution 10-20 rev/min is set, is separated into 100 revs/min, after stirring 5-10min, opens vacuum 0.7-0.9MPa, stir 10-20min;
Finally in reactor, add glass microballon, stirring velocity revolution 15-25 rev/min is set, be separated into 100 revs/min, stir 10-20min, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set, is separated into 60 revs/min, after stirring 5-10min, automobile fiber damping material can be obtained.
Beneficial effect of the present invention
First the present invention provides a kind of automobile fiber damping material, this damping material comprises isoprene-isobutylene rubber compound, epoxy resin, solidifying agent and all kinds of powder class fillers, isoprene-isobutylene rubber compound of the present invention has good damping capacity, ageing-resistant performance and high temperature performance, simultaneously, described isoprene-isobutylene rubber compound can be good with epoxy resin combination, not only can not reduce bending resistance and the shock resistance of fiber damping material, the effect of the vibration and noise reducing of damping material can also be increased; Add hollow glass microbead in described damping material, hollow glass microbead can improve or improve the water tolerance of material, ultimate compression strength, shrinking percentage and shock strength.Therefore fiber damping material provided by the invention is not only significantly improved on bending resistance, and damping property, ageing-resistant performance, high and low temperature resistance also have obvious improvement.
The present invention also provides a kind of preparation method of automobile fiber damping material, and the method technique is simple, raw material is easy to get, and the fiber damping material obtained not only has good bending resistance and shock resistance, and damping property have also been obtained raising.
Embodiment
First the present invention provides a kind of automobile fiber damping material, and this damping material comprises according to weight parts:
Isoprene-isobutylene rubber compound 20-30 part, epoxy resin 40-50 part, solidifying agent 2-3 part, talcum powder 12-16 part, glass microballon 2-5 part, organobentonite 2-5 part, polyethylene powder 1-2 part; Preferably, isoprene-isobutylene rubber compound 22-28 part, epoxy resin 42-48 part, solidifying agent 2.2-2.8 part, talcum powder 13-15 part, glass microballon 3-4 part, organobentonite 3-4 part, polyethylene powder 1.2-1.8 part.
According to the present invention, described rubber isoprene-isobutylene rubber compound, preferably according to weight parts, comprising:
Isoprene-isobutylene rubber 10-13 part, polyisobutene 2-3 part, rubber oil 15-20 part, carbon black 15-18 part, dicalcium powder 10-15 part, anti-aging agent 0.1-0.3 part, talcum powder 30-35 part, peptizer 0.1-0.3 part, moulds a point agent 0.1-0.3 part.
Of the present inventionly be not particularly limited isoprene-isobutylene rubber, preferably select the isoprene-isobutylene rubber virgin rubber that damping capacity is good, preferred product model of the present invention is the isoprene-isobutylene rubber of 1751.
According to the present invention, described polyisobutene is low-molecular-weight polyisobutene, and preference data molecular weight is 1000-3000.
According to the present invention, described rubber oil preferably meets the paraffin oil of ASTM standard.
According to the present invention, described peptizer is the mixture of high activity metal complex compound oxide catalyst and fatty acid zinc, is a kind of novel efficient and environment-friendly type rubber peptizer.Being preferably product type is the peptizer of AT-S.
According to the present invention, described moulds the mixture that point agent is fatty zinc soap and hydro carbons, be preferably product type be AT-E-II mould a point agent.
According to the present invention, described anti-aging agent is amine rubber antioxidant, to heat, oxygen, deflect be full of cracks, light, Weather effect all have more excellent protection effect, is preferably 4,4 ' a pair of a, a`-dimethyl benzyl pentanoic.
According to the present invention, described is not particularly limited carbon black, dicalcium powder and talcum powder, and preferred carbon black, dicalcium powder and talcous particle diameter are 19-16um.
The preparation method of isoprene-isobutylene rubber compound of the present invention, comprising:
Step one: the isoprene-isobutylene rubber of 10-13 weight part and 0.1-0.3 weight part peptizer are added in Banbury mixer and mixes, react 20-30min at 100-130 DEG C, obtain broken-(down)rubber;
Step 2: 0.1-0.3 weight part anti-aging agent is joined in the broken-(down)rubber that step one obtains, react at 80-90 DEG C in 5-10min, then 2-3 weight part polyisobutene reaction 5-10min is added, add 7-9 part by weight of carbon black again, 5-7 weight part dicalcium powder, 15-17 weight part talcum powder, 0.1-0.3 weight part mould a point agent, stir 5-8min, add 7-10 parts by weight of rubber oil, reaction 5-10min, obtains size mixture;
Step 3: 8-9 part by weight of carbon black, 5-8 weight part dicalcium powder, 15-18 weight part talcum powder are added in the size mixture that step 2 obtains, reaction 5-10min, and then adding remaining 8-10 parts by weight of rubber oil, reaction 30-40min, obtains isoprene-isobutylene rubber compound.
Isoprene-isobutylene rubber compound of the present invention is for matrix with isoprene-isobutylene rubber virgin rubber, add that the components such as polyisobutene, rubber oil and powder class filler mix, isoprene-isobutylene rubber virgin rubber is because there is distinctive molecular structure, resistance to air loss is good, resistance to ozone, ageing-resistant performance are good, and resistant of high or low temperature is better; Because its in-fighting is comparatively large, in-fighting is again the standard weighing damping, so isoprene-isobutylene rubber has good damping capacity, owing to adding the dicalcium powder with thermal and insulating performance, makes isoprene-isobutylene rubber compound of the present invention have good heat-proof quality.
According to the present invention, described epoxy resin is preferably bisphenol A type epoxy resin, be more preferably epoxy equivalent (weight) be 400-500 and epoxy equivalent (weight) at the mixture of 150-250, most preferably be the mixture of E39-D and E21.Described solidifying agent is preferably Dyhard RU 100 or quadrol, and the diameter of described glass microballon is preferably 0.2-0.27mm; Described polyethylene powder is Low Density Polyethylene powder.
According to the present invention, described is not particularly limited talcum powder, organobentonite.
The present invention also provides a kind of preparation method of automobile fiber damping material, comprising:
Reactor is warming up to 90-110 DEG C, be preferably 100 DEG C, add epoxy resin, vacuumize 0.7-0.9MPa, open whipping appts, stirring velocity arranges revolution for 15-25 rev/min, be preferably 20 revs/min, stir 20-40min, preferred 30min, then stop stirring, add talcum powder, polyethylene powder and organobentonite, stirring velocity revolution 5-15 rev/min is set, preferably 10 revs/min, be separated into 100 revs/min, stir 10-20 minute, preferred 15min, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set, preferably 15 revs/min, rate of dispersion is constant, stir 20-40min, preferred 30min,
Add isoprene-isobutylene rubber compound in a kettle., stirring velocity revolution 8-12 rev/min is set, preferably 10 revs/min, is separated into 100 revs/min, stirs 5-10min, open vacuum 0.7-0.9MPa, stir 5-15min, preferred 10min;
Reactor temperature is down to 80-90 DEG C, then adds solidifying agent, stirring velocity revolution 10-20 rev/min is set, be preferably 15 revs/min, be separated into 100 revs/min, after stirring 5-10min, open vacuum 0.7-0.9MPa, stir 10-20min, preferred 15min;
Finally in reactor, add glass microballon, stirring velocity revolution 15-25 rev/min is set, preferably 20 revs/min, be separated into 100 revs/min, stir 10-20min, preferred 15min, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set, preferably 15 revs/min, be separated into 60 revs/min, after stirring 5-10min, automobile fiber damping material can be obtained.
Moulding press is installed glasscloth and interleaving paper, carried out and compound compressing tablet by fiber damping material obtained above on moulding press, thickness is 0.8-2.0mm, can obtain fiber damping fin.Described alkali-free glass fiber cloth takes into account Procuring in advance through resin, and grammes per square metre is at 500-530g/m
2; Interleaving paper is two-sided interleaving paper, and grammes per square metre is at 110-140g/m
2.
Below in conjunction with embodiment, the present invention will be further described in detail
Embodiment 1
Step one: the isoprene-isobutylene rubber 1751 and 0.1 weight part AT-S of 10 weight parts is added in Banbury mixer and mixes, react 30min at 100 DEG C, obtain broken-(down)rubber;
Step 2: by 0.1 weight part 4,4 ' a pair of a, a`-dimethyl benzyl pentanoic joins in the broken-(down)rubber that step one obtains, react at 80 DEG C in 5min, then add 2 weight part polyisobutene (number average molecular weight is 1000) reaction 5min, then add 7 part by weight of carbon black, 5 weight part dicalcium powders, 15 weight part talcum powder, 0.1 weight part AT-E-II, stir 5min, add 7 weight part paraffin oils, reaction 10min, obtains size mixture;
Step 3: 8 part by weight of carbon black, 5 weight part dicalcium powders, 15 weight part talcum powder added in the size mixture that step 2 obtains, reaction 5min, and then add remaining 8 weight part paraffin oils, reaction 40min, obtains isoprene-isobutylene rubber compound.
Embodiment 2
Step one: the isoprene-isobutylene rubber 1751 and 0.3 weight part AT-S of 13 weight parts is added in Banbury mixer and mixes, react 20min at 130 DEG C, obtain broken-(down)rubber;
Step 2: by 0.3 weight part 4,4 ' a pair of a, a`-dimethyl benzyl pentanoic joins in the broken-(down)rubber that step one obtains, react at 90 DEG C in 10min, then add 3 weight part polyisobutene (number average molecular weight is 3000) reaction 10min, then add 9 part by weight of carbon black, 7 weight part dicalcium powders, 17 weight part talcum powder, 0.3 weight part AT-E-II, stir 8min, add 10 weight part paraffin oils, reaction 10min, obtains size mixture;
Step 3: 9 part by weight of carbon black, 8 weight part dicalcium powders, 18 weight part talcum powder added in the size mixture that step 2 obtains, reaction 10min, and then add remaining 10 weight part paraffin oils, reaction 30min, obtains isoprene-isobutylene rubber compound.
Embodiment 3
Step one: the isoprene-isobutylene rubber 1751 and 0.15 weight part AT-S of 11 weight parts is added in Banbury mixer and mixes, react 25min at 125 DEG C, obtain broken-(down)rubber;
Step 2: by 0.15 weight part 4,4 ' a pair of a, a`-dimethyl benzyl pentanoic joins in the broken-(down)rubber that step one obtains, react at 85 DEG C in 7min, then add 2.2 weight part polyisobutene (number average molecular weight is 2000) reaction 7min, then add 8 part by weight of carbon black, 6 weight part dicalcium powders, 16 weight part talcum powder, 0.15 weight part AT-E-II, stir 6min, add 8 weight part paraffin oils, reaction 10min, obtains size mixture;
Step 3: 8 part by weight of carbon black, 6 weight part dicalcium powders, 16 weight part talcum powder added in the size mixture that step 2 obtains, reaction 7min, and then add remaining 8 weight part paraffin oils, reaction 35min, obtains isoprene-isobutylene rubber compound.
Embodiment 4
Reactor is warming up to 90 DEG C, add the E39-D of 30 weight parts, the E21 of 10 weight parts, vacuumize 0.7MPa, open whipping appts, it is 15 revs/min that stirring velocity arranges revolution, stirs 20min, then stops stirring, add the talcum powder of 12 weight parts, the Low Density Polyethylene powder of 1 weight part and the organobentonite of 2 weight parts, stirring velocity is set and revolves round the sun 5 revs/min, be separated into 100 revs/min, stir 10min, open vacuum 0.7MPa, arrange stirring velocity and revolve round the sun 10 revs/min, rate of dispersion is constant, stirs 20min;
Add the isoprene-isobutylene rubber compound of 20 weight parts that embodiment 1 obtains in a kettle., stirring velocity is set and revolves round the sun 8 revs/min, be separated into 100 revs/min, stir 5min, open vacuum 0.7MPa, stir 5min;
Reactor temperature is down to 80 DEG C, then adds the Dyhard RU 100 of 2 weight parts, stirring velocity is set and revolves round the sun 10 revs/min, be separated into 100 revs/min, after stirring 5min, open vacuum 0.7MPa, stir 10min;
The last glass microballon (diameter of glass microballon is 0.2mm) adding 2 weight parts in reactor, stirring velocity is set and revolves round the sun 15 revs/min, be separated into 100 revs/min, stir 10min, open vacuum 0.7MPa, stirring velocity is set and revolves round the sun 10 revs/min, be separated into 60 revs/min, after stirring 5min, automobile fiber damping material can be obtained.
Moulding press is installed glasscloth and interleaving paper, carried out and compound compressing tablet by fiber damping material obtained above on moulding press, thickness is 0.8-2.0mm, can obtain fiber damping fin.The performance test results of the fiber damping fin that embodiment 1 obtains is as shown in table 1.
Embodiment 5
Reactor is warming up to 110 DEG C, add the E39-D of 35 weight parts, the E21 of 15 weight parts, vacuumize 0.9MPa, open whipping appts, it is 25 revs/min that stirring velocity arranges revolution, stirs 40min, then stops stirring, add the talcum powder of 16 weight parts, the Low Density Polyethylene powder of 2 weight parts and the organobentonite of 5 weight parts, stirring velocity is set and revolves round the sun 15 revs/min, be separated into 100 revs/min, stir 20min, open vacuum 0.9MPa, arrange stirring velocity and revolve round the sun 20 revs/min, rate of dispersion is constant, stirs 40min;
Add the isoprene-isobutylene rubber compound of 30 weight parts that embodiment 2 obtains in a kettle., stirring velocity is set and revolves round the sun 12 revs/min, be separated into 100 revs/min, stir 10min, open vacuum 0.9MPa, stir 15min;
Reactor temperature is down to 90 DEG C, then adds the quadrol of 3 weight parts, stirring velocity is set and revolves round the sun 20 revs/min, be separated into 100 revs/min, after stirring 10min, open vacuum 0.9MPa, stir 20min;
The last glass microballon (diameter of glass microballon is 0.27mm) adding 5 weight parts in reactor, stirring velocity is set and revolves round the sun 25 revs/min, be separated into 100 revs/min, stir 20min, open vacuum 0.9MPa, stirring velocity is set and revolves round the sun 20 revs/min, be separated into 60 revs/min, after stirring 10min, automobile fiber damping material can be obtained.
Moulding press is installed glasscloth and interleaving paper, carried out and compound compressing tablet by fiber damping material obtained above on moulding press, thickness is 0.8-2.0mm, can obtain fiber damping fin.The performance test results of the fiber damping fin that embodiment 2 obtains is as shown in table 1.
Embodiment 6
Reactor is warming up to 100 DEG C, add the E39-D of 30 weight parts, the E21 of 15 weight parts, vacuumize 0.9MPa, open whipping appts, it is 20 revs/min that stirring velocity arranges revolution, stirs 30min, then stops stirring, add the talcum powder of 14 weight parts, the Low Density Polyethylene powder of 1.5 weight parts and the organobentonite of 3 weight parts, stirring velocity is set and revolves round the sun 10 revs/min, be separated into 100 revs/min, stir 15min, open vacuum 0.9MPa, arrange stirring velocity and revolve round the sun 15 revs/min, rate of dispersion is constant, stirs 30min;
Add the isoprene-isobutylene rubber compound of 25 weight parts that embodiment 3 obtains in a kettle., stirring velocity is set and revolves round the sun 10 revs/min, be separated into 100 revs/min, stir 10min, open vacuum 0.9MPa, stir 10min;
Reactor temperature is down to 85 DEG C, then adds the quadrol of 2.5 weight parts, stirring velocity is set and revolves round the sun 15 revs/min, be separated into 100 revs/min, after stirring 10min, open vacuum 0.9MPa, stir 15min;
The last glass microballon (diameter of glass microballon is 0.24mm) adding 3 weight parts in reactor, stirring velocity is set and revolves round the sun 20 revs/min, be separated into 100 revs/min, stir 15min, open vacuum 0.9MPa, stirring velocity is set and revolves round the sun 15 revs/min, be separated into 60 revs/min, after stirring 10min, automobile fiber damping material can be obtained.
Moulding press is installed glasscloth and interleaving paper, carried out and compound compressing tablet by fiber damping material obtained above on moulding press, thickness is 0.8-2.0mm, can obtain fiber damping fin.The performance test results of the fiber damping fin that embodiment 3 obtains is as shown in table 1.
Table 1
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. an automobile fiber damping material, is characterized in that, this damping material comprises according to weight parts:
Described isoprene-isobutylene rubber compound, according to weight parts, comprises
2. a kind of automobile fiber damping material according to claim 1, is characterized in that, the number-average molecular weight of described polyisobutene is 1000-3000.
3. a kind of automobile fiber damping material according to claim 1, it is characterized in that, described rubber oil is paraffin oil.
4. a kind of automobile fiber damping material according to claim 1, it is characterized in that, described anti-aging agent is amines antioxidants.
5. a kind of automobile fiber damping material according to claim 1, it is characterized in that, described epoxy resin is bisphenol A type epoxy resin.
6. a kind of automobile fiber damping material according to claim 1, it is characterized in that, described solidifying agent is Dyhard RU 100 or quadrol.
7. a kind of automobile fiber damping material according to claim 1, is characterized in that, the diameter of described glass microballon is 0.2-0.27mm.
8. a kind of automobile fiber damping material according to claim 1, it is characterized in that, described polyethylene powder is Low Density Polyethylene powder.
9. the preparation method of a kind of automobile fiber damping material according to claim 1, is characterized in that, comprising:
Reactor is warming up to 90-110 DEG C, adds epoxy resin, vacuumize 0.7-0.9MPa, open whipping appts, stirring velocity arranges revolution for 15-25 rev/min, stirs 20-40min, then stop stirring, add talcum powder, polyethylene powder and organobentonite, stirring velocity revolution 5-15 rev/min is set, be separated into 100 revs/min, stir 10-20 minute, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set, rate of dispersion is constant, stirs 20-40min;
Add isoprene-isobutylene rubber compound in a kettle., stirring velocity revolution 8-12 rev/min is set, is separated into 100 revs/min, stirs 5-10min, open vacuum 0.7-0.9MPa, stir 5-15min;
Reactor temperature is down to 80-90 DEG C, then adds solidifying agent, stirring velocity revolution 10-20 rev/min is set, is separated into 100 revs/min, after stirring 5-10min, opens vacuum 0.7-0.9MPa, stir 10-20min;
Finally in reactor, add glass microballon, stirring velocity revolution 15-25 rev/min is set, be separated into 100 revs/min, stir 10-20min, open vacuum 0.7-0.9MPa, stirring velocity revolution 10-20 rev/min is set, is separated into 60 revs/min, after stirring 5-10min, automobile fiber damping material can be obtained.
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| CN104629197A (en) * | 2015-02-11 | 2015-05-20 | 朝阳华兴万达轮胎有限公司 | Butyl rubber inner tube with addition of appearance improving agent |
| CN104945848A (en) * | 2015-06-25 | 2015-09-30 | 安徽志诚机电零部件有限公司 | Damping mat |
| CN108752930A (en) * | 2018-05-21 | 2018-11-06 | 合肥仁德电子科技有限公司 | A kind of use for electronic products high damping material and preparation method thereof |
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| CN101486326A (en) * | 2008-01-17 | 2009-07-22 | 盐城市宝光车用材料有限公司 | Double-layer shock-absorbing damping plate for automobile and production method thereof |
| CN101654561A (en) * | 2008-08-22 | 2010-02-24 | 株洲时代新材料科技股份有限公司 | Modified asphalt hot-melt damping material for vehicles and preparation method and construction method thereof |
| CN103087663A (en) * | 2011-10-31 | 2013-05-08 | 比亚迪股份有限公司 | Reinforcing film matrix composition and its preparation method, reinforcing film and steel plate composite material |
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| JP4203589B2 (en) * | 2006-07-27 | 2009-01-07 | 日本特殊塗料株式会社 | Damping performance imparted steel plate reinforcement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486326A (en) * | 2008-01-17 | 2009-07-22 | 盐城市宝光车用材料有限公司 | Double-layer shock-absorbing damping plate for automobile and production method thereof |
| CN101654561A (en) * | 2008-08-22 | 2010-02-24 | 株洲时代新材料科技股份有限公司 | Modified asphalt hot-melt damping material for vehicles and preparation method and construction method thereof |
| CN103087663A (en) * | 2011-10-31 | 2013-05-08 | 比亚迪股份有限公司 | Reinforcing film matrix composition and its preparation method, reinforcing film and steel plate composite material |
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