CN109679215A - A kind of polypropylene composite materials damping material and preparation method thereof - Google Patents
A kind of polypropylene composite materials damping material and preparation method thereof Download PDFInfo
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- CN109679215A CN109679215A CN201811619627.XA CN201811619627A CN109679215A CN 109679215 A CN109679215 A CN 109679215A CN 201811619627 A CN201811619627 A CN 201811619627A CN 109679215 A CN109679215 A CN 109679215A
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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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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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
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
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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
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
Need to realize the above problem of damping function by way of cladding covering, filling sound-absorbing material for existing polypropylene material, the present invention provides a kind of polypropylene composite materials damping material, belong to the field of polymers damping material, including polypropylene: 30-65wt%, damping modification agent: 20-40wt%, reinforcing material: 15-35wt%, expanding material: 0.5-6.0wt%, antioxidant: 0.05-0.50wt%, light stabilizer: 0.05-0.50wt%, all of above component and be 100wt%；The polyacrylic melt index is 10-100g/10min (230 DEG C, 2.16kg), and the damping modification agent is damping materials or the composite material of itself and filler；The damping materials are that the rubber of melt index 0.5-10g/10min (190 DEG C, 2.16kg) elastomer or mooney viscosity less than 30MU pre-processes material；The filler is the powder with lamellar structure.Damping material that the present invention develops while there is high-modulus, high tenacity and high-damping coefficient, had both been able to satisfy the performance requirement of engineering plastics, and had also been able to satisfy the requirement of damping material, and overcome the low deficiency of common plastics damping factor.
Description
Technical field
The invention belongs to technical field of polymer materials, and in particular to a kind of polypropylene composite materials damping material and its preparation side
Method.
Background technique
Noise in automobile is mainly derived from engine, wind is made an uproar and the shock sound of tire and ground.Wherein, engine
Sound is incoming by positions such as instrument boards；Wind, which is made an uproar, is passed to automotive interior by glass, ceiling and automobile door plate；And tire and ground
The impact sound in face then can be incoming by fender, bottom plate etc..In general, interior noise is 55-70 points to 100km/h when driving
Shellfish, 40 decibels are normal ambient sounds, and above herein is exactly harmful noise, and reducing noise can be improved driver comfort,
Driving pleasure is improved, the danger for causing noise disease is reduced.In order to reduce the noise in automobile, to be often added very in automotive interior
The substances such as multiple foam material, acoustical cotton, to absorb noise.These materials often have lower density, occupy automotive interior
More space.
Damping material refers to damping factor (0.1 or more tan δ) with higher at service temperatures, to vibration and noise
Material with significant decrease effect, such as IIR, NBR, PIB, pitch and some other polymer.These materials make
Fissipation factor at a temperature of is higher than 0.1, even greater than 1.0, the kinetic energy that material shakes can be converted to thermal energy, reduce shake
It is dynamic, reduce noise.Fissipation factor refer to polymer at a certain temperature with the loss modulus and elasticity modulus under certain frequency
Ratio characterizes the part for having kinetic energy to be changed into loss thermal energy under certain vibration of polymer.Since polymer damping factor exists
Glass transition warmly takes nearby highest, the general glass transition temperature of damping material and leads near room temperature (except butyl rubber)
Damping material is caused to be generally based on elastomer, such as butyl rubber (IIR), flexibel polyurethane (PU), nitrile rubber (NBR) poly- isobutyl
Alkene (PIB) is at room temperature elastomer, has lower modulus and intensity, it is difficult to be used alone as structural material, usually pass through
Damping action is increased by structure composite with metal, plastic or other material, such as or sticks on metal surface, or do by structure composite
At sandwich structure.In addition, foamed material can also be used as acoustic damping materials use, principle is that sound wave is more in abscess
Secondary reflection consumption is realized not by the damping action of material itself.
In automobile interior decoration, it is a variety of that polypropylene modification plastics can manufacture door-plate, instrument board, column, seat and ceiling etc.
Components.But the damping factor of conventional polypropylene composite material is 0.05-0.1 or so at room temperature, in room temperature or use
Damping capacity in temperature range is very low, and vibration or noise are almost unattenuated after polymer, causes to ambient enviroment
Noise pollution, and surface is harder, and sense of touch is bad.So automotive interior, which generally passes through, is added acoustical cotton or soft by coating
The reduction of noise may be implemented in foaming covering etc., and not only processing technology is complicated, at high cost, but also increases automotive dead weight, ties up vehicle
Interior space.
Summary of the invention
It uses, needs through cladding covering, filling sound absorber as automotive interior material for existing polypropylene material
The mode of material realizes damping function, and complex process is unfavorable for lightweight and increases the above problem of interior space, the present invention is directed to
A kind of polypropylene composite materials damping material is provided, by the way that polypropylene is compound with damping material, the effect of reinforcing filler is prepared for having
There is the composite material of high-modulus, high tenacity and the high-damping factor, can be used as structural material and be used alone as automotive interior part.
The present invention is achieved by the following technical solutions:
A kind of polypropylene composite materials damping material, including following components: polypropylene: 30-65wt%, damping modification agent: 20-
40wt%, reinforcing material: 15-35wt%, expanding material: 0.5-6.0wt%, antioxidant: 0.05-0.50wt%, light stabilizer:
0.05-0.50wt%, all of above component and be 100wt%；；
The polyacrylic melt index is 20-120g/10min (230 DEG C, 2.16kg),
The damping modification agent is damping materials or the composite material of itself and filler；The damping materials are
The rubber of melt index 0.5-10g/10min (190 DEG C, 2.16kg) elastomer or mooney viscosity less than 30MU pre-processes material；Institute
Stating filler is the powder with lamellar structure.
The polypropylene melt index is that the homopolypropylene of 10-60g/10min (230 DEG C, 2.16kg) or copolymerization gather
Allyl resin.
The damping materials substrate material elastomer includes but is not limited to EVA, Gao Yi that POE, VA content are 40-80%
The TPE such as the SBS of amount vinyl content or Hydrogenated SBS,；The rubber is nitrile rubber NBR of the acrylonitrile content greater than 30%, fourth
Base rubber IIR halogenation IIR, neoprene CR, polyisobutene, esters of acrylic acid rubber or polyurethane rubber.
The processing method of rubber the pretreatment material and the composite material of filler are as follows: mix rubber investment mixer close
Refining 2 minutes, every 100 parts by weight of rubber 10-40 parts of filler of addition and 1-5 parts of coupling agent, continuation mixing 3-5 minutes, so
It discharge and is cooled to room temperature, shreds and adds 1-3wt% talcum powder interleaving agent afterwards；The coupling agent is silane coupling agent, titanium
Acid esters coupling agent or aluminate coupling agent；
The processing method of the elastomer and filler is to be passed through using double screw extruder mixed elastomer and filler
It is cooling, be granulated it is spare.
The silane coupling agent is silane coupling agent, titanate coupling agent or aluminate coupling agent.
The filler includes but is not limited to the nothings such as mica, talcum powder, montmorillonite, calcium carbonate, carbon black or silica
Machine minerals.
The reinforcing material is selected from glass fibre, carbon fiber, polymer fiber, plant fiber, mineral fibres, whisker fillers
Deng using coupling agent progress surface coating processing.
The expanding material is maleic anhydride inoculated polypropylene, maleic anhydride grafting POE, silane grafted polyacrylate etc..
The silane coupling agent includes but is not limited to KH550, KH570, A-151, A172 etc..
The antioxidant is the mixture of one or both of Hinered phenols, phosphite ester antioxidant；It is described by
Hindering phenolic antioxidant can be phosphorous acid three (2,4-di-tert-butyl phenolic ester), and the phosphite ester antioxidant can be four
[β-(3,5-- 4-hydroxy phenyl of di-t-butyl) propionic acid] pentaerythritol ester.
The light stabilizer is hindered amine light stabilizer；Including but not limited to bis- (2,2,6,6- tetramethyl -4- piperidines
Base) sebacate, succinic acid and 4- hydroxyl -2,2,6,6- tetramethyl -1- piperidine alcohols polymer and poly- { [6- (1,1,3,3-
Tetramethyl butyl)-imino group] -1,3,5 triazine -2,4- diyls [2- (2,2,6,6- tetramethyl-piperidyl)-amino]-it is sub- oneself
Base-[4- (2,2,6,6- tetramethyl-piperidyl)-imino group]) one of or it is a variety of.
The present invention also provides a kind of preparation methods of polypropylene composite materials damping material, weigh each component according to above-mentioned formula,
All material in addition to reinforcing material is passed through into main feed opening using high-speed mixer after mixing, twin-screw extrusion is added
Reinforcing material is added by side loading mouth in machine, and the processing temperature of double screw extruder is 180-220 DEG C, revolving speed 200-700rpm,
Up to required product after melting extrusion, cooling, pelletizing.
Damping material that the present invention develops while there is high-modulus, high tenacity and high-damping coefficient, is both able to satisfy engineering plastic
The performance requirement of material is also able to satisfy the requirement of damping material, overcomes the low deficiency of common plastics damping factor.Damping factor
0.3-0.6 has obvious effect to reducing noise (especially low frequency noise) and reducing vibration.Modulus 1800MPa or more, as
Automobile interior decoration, the material can be applied to the positions such as automobile door plate, major-minor instrument board, column, ceiling, hat rack, seat, can be with
It is processed and formed at one time by conventional injection molding machine, without the secondary processes such as sticking, simplifies technique, the side with filling attractive material
Formula is compared, and material volume reduces, weight saving, and vapour interior space increases.While with high-modulus with high intensity, surface tool
There is soft sense of touch, touching up has the experience of the covering materials such as leather, can reduce cost, saves material, realizes product increment.
Specific embodiment
The present invention is described in further details combined with specific embodiments below.
Embodiment 1
It weighs 45 parts of BX3900 of high-crystallinity polypropylene (HCPP), 5,127 20 parts of SBS elastomer, alkali-free short glass fiber
538A30 parts, maleic anhydride connects 4 parts of branch polypropylene and antioxidant 0.2%, light stabilizer 0.2% etc., in addition to glass fibre
All material using by main feed opening addition double screw extruder, being pressed in side loading mouth after high-speed mixer mixing 3-5min
Glass fibre is added according to weight demands, the revolving speed of double screw extruder is 300RPM, and temperature is 180-220 DEG C.Then by cold
But, up to required product after pelletizing.
Products obtained therefrom MFR is 18g/10min, tensile strength 60Mpa, bending modulus 3500Mpa, impact strength 20kj/m2,
Damping factor tan δ is 0.30 at room temperature.
Embodiment 2
It weighs 35 parts of BX3900 of high-crystallinity polypropylene (HCPP), 5,125 30 parts of SBS elastomer, alkali-free glass fibre 538A
25 parts, maleic anhydride meets 3 parts of branch polypropylene and antioxidant 0.2%, light stabilizer 0.2% etc., the institute in addition to glass fibre
Pass through main feed opening addition double screw extruder after having materials'use high-speed mixer mixing 3-5min, in side loading mouth according to weight
Amount requires that glass fibre is added, and the revolving speed of double screw extruder is 700RPM, and temperature is 180-220 DEG C.Then pass through cooling, cut
Up to required product after grain.
Products obtained therefrom MFR is 15g/10min, tensile strength 50Mpa, bending modulus 2800Mpa, impact strength 25kj/m2,
Damping factor tan δ is 0.40 at room temperature.
Embodiment 3
It weighs 35 parts of BX3900 of high-crystallinity polypropylene (HCPP), 5,125 35 parts of SBS elastomer, alkali-free glass fibre 538A
25 parts, maleic anhydride meets 3 parts of branch polypropylene and antioxidant 0.2%, light stabilizer 0.2% etc., the institute in addition to glass fibre
Pass through main feed opening addition double screw extruder after having materials'use high-speed mixer mixing 3-5min, in side loading mouth according to weight
Amount requires that glass fibre is added, and the revolving speed of double screw extruder is 500RPM, and temperature is 180-220 DEG C.Then pass through cooling, cut
Up to required product after grain.
Products obtained therefrom MFR is 15g/10min, tensile strength 40Mpa, bending modulus 2000Mpa, impact strength 25kj/m2,
Damping factor tan δ is 0.45 at room temperature.
Embodiment 4
The chemical butyl rubber B2030 of bright Sheng is selected, is cut into small pieces in bale splitter, is then comminuted into the bulk of diameter 3-7mm,
Be added 2% talcum powder interleaving agent be uniformly mixed it is spare.
It weighs 20 parts of CB5230 of high-crystallinity polypropylene (HCPP), 20 parts of copolymer polypropylene 548R, the damping of above-mentioned preparation
30 parts of modifying agent, 25 parts of alkali-free short glass fiber 538A, maleic anhydride connects 3 parts of branch polypropylene and antioxidant 0.2%, light
Stabilizer 0.2% etc., all material in addition to glass fibre pass through main feed opening after using high-speed mixer mixing 3-5min
Double screw extruder is added, glass fibre is added according to weight demands in side loading mouth, the revolving speed of double screw extruder is
600RPM, temperature are 180-220 DEG C.Then by cooling down, after pelletizing up to required product.
Products obtained therefrom MFR is 10g/10min, tensile strength 35Mpa, bending modulus 1800Mpa, impact strength 32kj/m2,
Damping factor tan δ is 0.48 at room temperature.
Embodiment 5
Chemical 80 parts of B2030 of the butyl rubber of bright Sheng is selected, is cut into small pieces in bale splitter, it is close then to put into mixer mixing
20 parts of 1250 mesh mica powder, 2 parts of silane coupling agent KH570 is added in refining 2 minutes, continues mixing 3-5 minutes, is subsequently cooled to room
Temperature, shred and add 1% talcum powder interleaving agent isolation it is spare.
It weighs 20 parts of CB5230 of high-crystallinity polypropylene (HCPP), 20 parts of copolymer polypropylene 548R, the damping of the preparation
30 parts of modifying agent, 25 parts of alkali-free short glass fiber 538A, maleic anhydride connects 3 parts of branch polypropylene and antioxidant 0.2%, light
Stabilizer 0.2% etc., all material in addition to glass fibre pass through main feed opening after using high-speed mixer mixing 3-5min
Double screw extruder is added, glass fibre is added according to weight demands in side loading mouth, the revolving speed of double screw extruder is
600RPM, temperature are 180-220 DEG C.Then by cooling down, after pelletizing up to required product.
Products obtained therefrom MFR is 18g/10min, tensile strength 37Mpa, bending modulus 1850Mpa, impact strength 28kj/m2,
Damping factor tan δ is 0.56 at room temperature.
One, existing Polypropylene composite material for automobile
Formula: 40 parts of BX3900 of high-crystallinity polypropylene (HCPP) enhances 20 parts of copolymer polypropylene 548RQ, POE toughener
884212 parts, 20 parts of talcum powder CP250, maleic anhydride connects 3 parts of branch polypropylene and 0.2 part of antioxidant, 0.2 part of light stabilizer
Deng using the revolving speed of main feed opening addition double screw extruder double screw extruder is again after high-speed mixer mixing 3-5min
500RPM, temperature are 180-220 DEG C.Then by cooling down, after pelletizing up to required product.
Products obtained therefrom MFR is 20g/10min, tensile strength 18Mpa, bending modulus 1700MPa, impact strength 42kj/m2,
Damping factor tan δ is 0.05 at room temperature.
Two, single factor test comparative experiments:
Comparative example 1: compared with Example 3, formula the difference is that, do not contain damping modification agent, increase corresponding amount
Plasticized modifier POE8200, all material in addition to glass fibre added using main again after high-speed mixer mixing 3-5min
Double screw extruder is added in material mouth, glass fibre is added according to weight demands in side loading mouth, the revolving speed of double screw extruder is
300RPM, temperature are 180-220 DEG C.Then by cooling down, after pelletizing up to required product.
Products obtained therefrom MFR is 18g/10min, tensile strength 25Mpa, bending modulus 1600Mpa, impact strength 41kj/m2,
Damping factor tan δ is 0.07 at room temperature.
Comparative example 2: it compared with Example 5, changes the mica powder of laminated structure in damping modification agent into granular calcium carbonate, removes
All material other than reinforcing material using main feed opening addition double screw extruder again after high-speed mixer mixing 3-5min,
Glass fibre is added according to weight demands in side loading mouth, and the revolving speed of double screw extruder is 600RPM, and temperature is 180-220 DEG C.
Then by cooling down, after pelletizing up to required product.
Products obtained therefrom MFR is 20g/10min, tensile strength 35Mpa, bending modulus 1700Mpa, impact strength 32kj/m2,
Damping factor tan δ is 0.45 at room temperature.
1 embodiment of table and comparative formulation (parts by weight)
2 embodiment of table and comparative example properties of product
By being tested above it is found that automobile interior decoration common PP-EPDM-T20 material at present, damping factor 0.07, no
It is able to satisfy the requirement of damping material；And material of the invention passes through the selection of damping materials, formulation optimization and microcosmic polymer
Structure design, product damping factor significantly improve, and up to 0.56, performance is significantly improved compared with comparative example, fully meets material
To the double requirements of structural material and damping material.
Comparative experiments shows comparative example 1 by glass fibre and POE modified polypropene, have preferable intensity, modulus and
Toughness, but since POE damping factor itself is low, the damping factor of comparative example 1 is less than 0.1 at room temperature；The analysis of comparative example 2 is modified
Influence of the filling-material structure to damping capacity in agent, compared to particle fillers such as calcium carbonate, laminal filter is more advantageous to raising material
Damping factor, improve damping capacity.Therefore, material of the invention can meet material to mechanical property and damping capacity simultaneously
Requirement, processing technology is convenient, and surface has soft sense of touch effect.
Embodiment described above is only that preferred embodiments of the present invention will be described, not to the scope of the present invention
It is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical solution of the present invention
The various changes and improvements made should all be fallen into the protection scope that claims of the present invention determines.
Claims (9)
1. a kind of polypropylene composite materials damping material, which is characterized in that including following components: polypropylene: 30-65wt%, damping change
Property agent: 20-40wt%, reinforcing material: 15-35wt%, expanding material: 0.5-6.0wt%, antioxidant: 0.05-0.50wt%, light
Stabilizer: 0.05-0.50wt%, all of above component and be 100wt%；
The polyacrylic melt index is 10-100g/10min (230 DEG C, 2.16kg)；
The damping modification agent is damping materials or the composite material of itself and filler；The damping materials are melting
The rubber of index 0.5-10g/10min (190 DEG C, 2.16kg) elastomer or mooney viscosity less than 30MU pre-processes material；It is described to fill out
Filling agent is the powder with lamellar structure.
2. damping material according to claim 1, which is characterized in that the polypropylene melt index is 10-60g/
The homopolypropylene or acrylic resin copolymer of 10min (230 DEG C, 2.16kg).
3. damping materials substrate according to claim 1, which is characterized in that the elastomer is that POE, VA content are
The EVA of 40-80%, the SBS of high-vinyl-content or Hydrogenated SBS；The rubber is the fourth that acrylonitrile content is greater than 30%
Nitrile rubber NBR, butyl rubber IIR, neoprene CR, polyisobutene PIB, esters of acrylic acid rubber or polyurethane rubber.
4. damping material according to claim 1, which is characterized in that the composite wood of rubber the pretreatment material and filler
The processing method of material are as follows: put into rubber mixer mixing mixing 2 minutes, 10-40 parts of filling is added in every 100 parts by weight of rubber
Agent and 1-5 parts of coupling agent continue mixing 3-5 minutes, then discharge and are cooled to room temperature, shred and add 1-3wt% talcum
Powder interleaving agent；The coupling agent is silane coupling agent, titanate coupling agent or aluminate coupling agent；
The processing method of the elastomer and filler is using double screw extruder mixed elastomer and filler, through being subcooled
But, it is granulated spare.
5. damping material according to claim 4, which is characterized in that it is de- that the filler is selected from mica, talcum powder, illiteracy
Soil, calcium carbonate, carbon black or silica.
6. damping material according to claim 1, which is characterized in that the reinforcing material be selected from glass fibre, carbon fiber,
Polymer fiber, plant fiber, mineral fibres, whisker fillers carry out surface coating processing using coupling agent.
7. damping material according to claim 1, which is characterized in that the expanding material be maleic anhydride inoculated polypropylene,
Maleic anhydride is grafted POE or silane grafted polyacrylate.
8. damping material according to claim 1, which is characterized in that the antioxidant is Hinered phenols, phosphite ester
The mixture of one or both of kind antioxidant；The light stabilizer is hindered amine light stabilizer.
9. a kind of preparation method of polypropylene composite materials damping material, which is characterized in that formula described in accordance with the claim 1 weighs
All material in addition to reinforcing material is passed through main feed opening using high-speed mixer after mixing and double spiral shells is added by each component
Reinforcing material is added by side loading mouth in bar extruder, and the processing temperature of double screw extruder is 180-220 DEG C, melting extrusion,
Up to required product after cooling, pelletizing.
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Cited By (5)
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| CN110092872A (en) * | 2019-05-31 | 2019-08-06 | 青岛海尔新材料研发有限公司 | The extrusion foaming of one-step method preparation damping PP composite material and preparation method thereof |
| CN110105701A (en) * | 2019-05-31 | 2019-08-09 | 青岛海尔新材料研发有限公司 | A kind of extrusion foaming PP composite material |
| CN112341715A (en) * | 2020-11-19 | 2021-02-09 | 天津金发新材料有限公司 | Modified polypropylene composite material for automobile bumper and preparation method thereof |
| CN112480549A (en) * | 2020-11-27 | 2021-03-12 | 武汉金发科技有限公司 | Low-noise polypropylene composite material for vehicles and preparation method thereof |
| CN116239838A (en) * | 2022-12-30 | 2023-06-09 | 上海金发科技发展有限公司 | Polypropylene composition and preparation method and application thereof |
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| CN112480549A (en) * | 2020-11-27 | 2021-03-12 | 武汉金发科技有限公司 | Low-noise polypropylene composite material for vehicles and preparation method thereof |
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