CN113388195B - Automobile bumper and preparation method thereof - Google Patents
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- CN113388195B CN113388195B CN202110565374.8A CN202110565374A CN113388195B CN 113388195 B CN113388195 B CN 113388195B CN 202110565374 A CN202110565374 A CN 202110565374A CN 113388195 B CN113388195 B CN 113388195B
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- 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
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- 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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Abstract
The invention provides an automobile bumper which is prepared from the following raw materials in parts by weight: 70-90 parts of polypropylene matrix, 15-25 parts of polyolefin elastomer, 3-5 parts of polyvinylpyrrolidone, 1-3 parts of glycerol, 1-3 parts of nano molybdenum disulfide, 0.5-1 part of nano silicon dioxide, 1-3 parts of graphene powder, 20-30 parts of absolute ethyl alcohol, 2-5 parts of alginate fibers, 1-3 parts of magnesium sulfate whiskers, 3-6 parts of lauryl acrylate, 1-3 parts of wollastonite and 0.5-1.5 parts of titanate coupling agent. The automobile bumper prepared by the invention not only meets the light weight requirement, but also has excellent impact resistance, flame retardance and other properties through a 'net structure + pore structure' two-phase composite system.
Description
Technical Field
The invention relates to the technical field of bumper preparation, in particular to an automobile bumper and a preparation method thereof.
Background
The automobile bumper is an important large part in the automobile industry, not only plays a role in decorating and beautifying, but also can protect an automobile body in low-speed collision and plays a role in buffering and protecting a driver. The using environment of the composite material requires excellent high and low temperature impact toughness, rigidity, aging resistance, heat resistance, cold resistance, oil resistance, lubricating oil, paint and other performances. Among them, the most important is to have high impact toughness and good moldability.
At present, most materials of the automobile bumper adopt toughened polypropylene (PP), a blend (PP/EPDM) of an ethylene-propylene elastomer and polyolefin and the like, the tensile strength and the rigidity are good in mechanical property, but the impact resistance is poor, particularly, the toughened polypropylene (PP) has poor impact resistance and shows material brittleness convexly at low temperature, and if the automobile bumper is produced and molded, the inside of a product has orientation stress, so that the impact strength is obviously reduced; therefore, the energy absorption performance of the automobile bumper is poor after collision, the bumper is easy to shatter and scatter, the automobile tire is punctured if the automobile is light, and people are injured by traffic accidents if the automobile is heavy.
Disclosure of Invention
The invention aims to overcome the defects of poor impact resistance and the like of materials for automobile bumpers in the prior art, and provides a novel automobile bumper and a preparation method thereof.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the automobile bumper comprises the following raw materials in parts by weight: 70-90 parts of polypropylene matrix, 15-25 parts of polyolefin elastomer, 3-5 parts of polyvinylpyrrolidone, 1-3 parts of glycerol, 1-3 parts of nano molybdenum disulfide, 0.5-1 part of nano silicon dioxide, 1-3 parts of graphene powder, 20-30 parts of absolute ethyl alcohol, 2-5 parts of alginate fibers, 1-3 parts of magnesium sulfate whisker, 3-6 parts of lauryl acrylate, 1-3 parts of wollastonite and 0.5-1.5 parts of titanate coupling agent.
Preferably, 80 parts of polypropylene matrix, 18 parts of polyolefin elastomer, 4 parts of polyvinylpyrrolidone, 2 parts of glycerol, 2 parts of nano molybdenum disulfide, 0.8 part of nano silicon dioxide, 2.5 parts of graphene powder, 25 parts of absolute ethyl alcohol, 4 parts of alginate fiber, 2 parts of magnesium sulfate whisker, 4 parts of lauryl acrylate, 2 parts of wollastonite and 1 part of titanate coupling agent.
The preparation method of any one of the automobile bumpers comprises the following steps:
s1: mixing the polypropylene matrix, the polyolefin elastomer and the polyvinylpyrrolidone in proportion, and melting and mixing at 160-180 ℃ until the mixture is uniform; then adding glycerol, heating to 260-280 ℃ at the speed of 3-5 ℃/min, and carrying out heat preservation reaction for 5-10min to obtain a material A;
s2: uniformly mixing nano molybdenum disulfide, nano silicon dioxide, graphene powder and absolute ethyl alcohol according to a proportion to obtain a material B; adding the material B into the step S1, and stirring and reacting at the temperature of 80-100 ℃ for 25-35min to obtain a material C;
s3: adding alginate fibers, magnesium sulfate whiskers and lauryl acrylate into the material C obtained in the step S2, raising the temperature to 140-160 ℃, and stirring for reaction for 30-50min to obtain a material D;
s4: reacting wollastonite with a titanate coupling agent in proportion to obtain modified wollastonite; then adding the mixture into the step S3, and continuously stirring and reacting for 25-45min at the temperature of 160-180 ℃ to obtain a material E;
s5: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of the screws at 42-50r/min and the temperature of each section at 180-220 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 210-230 ℃, the injection molding time is 16-25s, and carrying out sand blasting, polishing, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
Preferably, step S1 specifically includes: mixing the polypropylene matrix, the polyolefin elastomer and the polyvinylpyrrolidone in proportion, and melting and mixing at 175 ℃ until the mixture is uniform; then adding glycerol, heating to 270 ℃ at the speed of 2 ℃/min, and carrying out heat preservation reaction for 8min to obtain a material A.
Preferably, step S2 specifically includes: uniformly mixing nano molybdenum disulfide, nano silicon dioxide, graphene powder and absolute ethyl alcohol according to a proportion to obtain a material B; adding the material B into the step S1, and stirring and reacting for 35min at the temperature of 90 ℃ to obtain a material C.
Preferably, step S3 specifically includes: and (3) adding the alginate fibers, the magnesium sulfate whiskers and the lauryl acrylate into the material C obtained in the step (S2), raising the temperature to 150 ℃, and stirring for reacting for 35min to obtain a material D.
Preferably, step S4 specifically includes: reacting wollastonite with a titanate coupling agent in proportion to obtain modified wollastonite; and then adding the mixture into the step S3, and continuously stirring and reacting for 30min at the temperature of 170 ℃ to obtain a material E.
Preferably, step S5 specifically includes: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of screws at 46r/min and the temperature of each section at 200 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling the material by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 215 ℃, the injection molding time is 18s, and carrying out sand blasting, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
Has the beneficial effects that:
1. the automobile bumper composite material system forms a two-phase composite system of a net structure and a hole structure, the elastomer and the filler which are uniformly dispersed in the composite system form a stress concentration point, three-dimensional tension is generated around the stress concentration point, the transmission process of the impact stress is stabilized, most impact energy is absorbed, and the impact resistance is obviously improved; light weight and excellent flame retardance, aging resistance and other performances.
2. The copolymer sequence of the polyolefin elastomer is uniformly distributed, has narrow molecular weight distribution and lower crystallinity, has good compatibility with a polypropylene matrix and obvious toughening effect, and the good fluidity of the polyolefin elastomer can improve the dispersion effect of the nano molybdenum disulfide, the nano silicon dioxide and the graphene powder and obviously reduce the interfacial tension between the components of the blend.
3. In the invention, on the aspect of a pore structure, bubbles are generated in a polypropylene matrix and a polyolefin elastomer liquid in a molten state through polyvinylpyrrolidone, in the presence of glycerol, a large amount of small bubbles can be generated, the small bubbles are controlled to be uniformly distributed to form a uniform micropore structure, and then nano molybdenum disulfide, nano silicon dioxide and graphene powder are filled in the micropore structure, so that the light-weight and strength are not weakened; interlayer sulfur atoms in the nano molybdenum disulfide are difficult to bond and easy to slide, and when the polypropylene fiber is subjected to impact pressure, the interlayer combination is not firm due to electrostatic repulsion of interlayer electrons, so that the effect of sliding wetting is achieved; the characteristic atomic arrangement of the surface of the graphene powder is that the atomic arrangement state of the surface of the graphene is like a raised hexagonal hollow eggshell, and when the surface slides towards a specific direction, the projections are staggered with each other, so that the surface is hardly rubbed; under the synergistic effect of the two components, the pore structure plays a role in buffering the impact force on the polypropylene.
4. According to the invention, lauryl acrylate is introduced into a net structure layer and is mutually entangled with polypropylene, alginate fibers, magnesium sulfate whiskers and the like to form a three-dimensional net-shaped body structure; the modified wollastonite is filled in a net structure, each finely distributed wollastonite particle is used as a stress concentration point, when the composite system is impacted, crazing can be initiated in a matrix, mutual interference among the crazing prevents the possibility that the crazing is further developed into macroscopic cracking, and energy is dissipated in the process, so that the elastic modulus of the composite system is increased; under the action of the net structure and the hole structure, the shock resistance of the bumper is obviously improved, and the bumper has good flame retardance and aging resistance.
Detailed Description
The present invention is further illustrated below by reference to the following examples, which are intended to be illustrative of the invention only and are not intended to be limiting.
Example 1
S1: mixing 70g of polypropylene matrix, 15g of polyolefin elastomer and 3g of polyvinylpyrrolidone, and melting and mixing at 160 ℃ until the mixture is uniform; then adding 1g of glycerol, heating to 261 ℃ at the speed of 3 ℃/min, and carrying out heat preservation reaction for 5min to obtain a material A;
s2: uniformly mixing 1g of nano molybdenum disulfide, 0.5g of nano silicon dioxide, 1g of graphene powder and 20g of absolute ethyl alcohol to obtain a material B; adding the material B into the step S1, and stirring and reacting for 25min at the temperature of 80 ℃ to obtain a material C;
s3: adding 2g of alginate fibers, 1g of magnesium sulfate whiskers and 3g of lauryl acrylate into the material C obtained in the step S2, raising the temperature to 140-160 ℃, and stirring for reaction for 30-50min to obtain a material D;
s4: 1g of wollastonite and 0.5g of titanate coupling agent are reacted to obtain modified wollastonite; then adding the mixture into the step S3, and continuously stirring and reacting for 25min at the temperature of 160 ℃ to obtain a material E;
s5: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of screws at 42r/min and the temperature of each section at 180-200 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling the material by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 210 ℃, the injection molding time is 16s, and carrying out sand blasting, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
Example 2
S1: mixing 90g of polypropylene matrix, 25g of polyolefin elastomer and 5g of polyvinylpyrrolidone, and melting and mixing at 180 ℃ until the mixture is uniform; then adding 3g of glycerol, heating to 280 ℃ at the speed of 5 ℃/min, and carrying out heat preservation reaction for 10min to obtain a material A;
s2: uniformly mixing 3g of nano molybdenum disulfide, 1g of nano silicon dioxide, 3g of graphene powder and 30g of absolute ethyl alcohol to obtain a material B; adding the material B into the step S1, and stirring and reacting for 35min at the temperature of 100 ℃ to obtain a material C;
s3: adding 5g of alginate fibers, 3g of magnesium sulfate whiskers and 6g of lauryl acrylate into the material C obtained in the step S2, raising the temperature to 160 ℃, and stirring for reacting for 50min to obtain a material D;
s4: reacting 3g of wollastonite with 1.5g of titanate coupling agent to obtain modified wollastonite; then adding the mixture into the step S3, and continuously stirring and reacting for 45min at the temperature of 180 ℃ to obtain a material E;
s5: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of screws at 50r/min and the temperature of each section at 200-220 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 230 ℃, the injection molding time is 25s, and carrying out sand blasting, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
Example 3
S1: mixing 80g of polypropylene matrix, 18g of polyolefin elastomer and 4g of polyvinylpyrrolidone, and melting and mixing at 175 ℃ until the mixture is uniform; then 2g of glycerol is added, the temperature is raised to 270 ℃ at the speed of 2 ℃/min, and the reaction is carried out for 8min under the condition of heat preservation, thus obtaining a material A;
s2: uniformly mixing 2g of nano molybdenum disulfide, 0.8g of nano silicon dioxide, 2.5g of graphene powder and 25g of absolute ethyl alcohol to obtain a material B; adding the material B into the step S1, and stirring and reacting for 35min at the temperature of 90 ℃ to obtain a material C;
s3: adding 4g of alginate fibers, 2g of magnesium sulfate whiskers and 4g of lauryl acrylate into the material C obtained in the step S2, raising the temperature to 150 ℃, and stirring for reacting for 35min to obtain a material D;
s4: reacting 2g of wollastonite with 1g of titanate coupling agent to obtain modified wollastonite; then adding the mixture into the step S3, and continuously stirring and reacting for 30min at the temperature of 170 ℃ to obtain a material E;
s5: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of screws at 46r/min and the temperature of each section at 190-210 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 215 ℃, the injection molding time is 18s, and carrying out sand blasting, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
Comparative example 1
The difference from example 1 is that ethylene propylene diene monomer was used in place of the polyolefin elastomer in step S1, and the other steps and conditions were not changed.
Compared with the comparative example 1 and the example 1, when the ethylene propylene diene monomer is used as the auxiliary material, the compatibility of the ethylene propylene diene monomer with a polypropylene matrix is reduced, the toughening effect is reduced, and the dispersibility of the nano molybdenum disulfide, the nano silicon dioxide and the graphene powder is reduced, so that the impact resistance is weakened.
Comparative example 2
The difference from the example 1 is that the polyvinylpyrrolidone and the glycerol are not added in the step S1, the sequence of the step S2 and the step S3 is changed, and other steps and conditions are not changed.
Comparing with comparative example 2 and example 1, it is known that, due to the absence of polyvinylpyrrolidone, a microporous structure cannot be formed, and the nano molybdenum disulfide, nano silica, and graphene powder cannot be filled in the microporous structure, but are merely a mesh-like primary structure, and cannot exert the synergistic effect of the porous structure and the filler, and the impact resistance is weakened.
Comparative example 3
The difference from example 1 is that no graphene powder is added in step S2, and other steps and conditions are unchanged.
Comparative example 4
The difference from the example 1 is that molybdenum disulfide is not added in the step S2, and other steps and conditions are not changed.
As can be seen from comparison among comparative examples 3, 4 and 1, when only one of the molybdenum disulfide and the graphene powder is present, only a single function of the nano molybdenum disulfide that the interlayer bonding is not strong or the atomic arrangement state of the surface of the graphene powder is staggered from each other like a raised hexagonal hollow eggshell is exerted, and the function of the pore structure as a buffer against the impact force applied to the polypropylene is reduced.
Comparative example 5
The difference from example 1 is that no lauryl acrylate was added in step S3, and the other steps and conditions were unchanged.
Comparing with comparative example 5 and example 1, it is known that polypropylene, alginate fiber, magnesium sulfate whisker and the like do not fully form a three-dimensional net-shaped three-dimensional structure, and nano molybdenum disulfide, nano silicon dioxide, graphene powder, modified wollastonite and the like are doped in the three-dimensional net-shaped three-dimensional structure, so that the rigidity and the impact resistance of the whole material are influenced.
Comparative example 6
The difference from embodiment 1 is that step S4 is absent and other steps and conditions are unchanged.
Comparing with comparative example 6 and example 1, it is known that the silver striations can not interfere with each other due to the lack of modified wollastonite filled in the network structure, macroscopic cracking can be further developed, the elastic modulus of the composite system is not high, and the impact resistance is reduced.
The performance test method comprises the following steps:
the densities in the examples of the invention and the comparative examples were tested according to ISO 1183-1; the tensile properties are all tested according to ISO 527-2 standard, wherein the tensile speed is 50mm/min; the bending performance is tested according to ISO 178 standard, wherein the bending speed is 2mm/min; testing the notch impact of the cantilever beam according to the ISO 180 standard; the melt indexes are all tested according to the ISO 1133-1/2 standard; the appearances of the tiger stripes are evaluated according to the internal evaluation standard of KINGFA (invisible to naked eyes within the grade of 1-1 m; invisible to naked eyes within the grade of 2-0.7 m; invisible to naked eyes within the grade of 3-0.5 m; and completely invisible to naked eyes within the grade of 4-0.3 m); and (3) aging resistance test: 100 +/-2 ℃ for 168h.
The above examples and comparative examples were tested and the results are as follows:
| test of | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| Density/(g/cm) -3 ） | 0.94 | 0.95 | 0.92 | 0.95 | 0.97 | 0.94 | 0.94 | 0.98 | 0.94 |
| Tensile strength/MPa | 19.1 | 19.4 | 20.7 | 17.1 | 18.7 | 18.1 | 17.9 | 16.1 | 17.9 |
| Flexural modulus/MPa | 1607 | 1629 | 1667 | 1314 | 1174 | 1573 | 1582 | 1204 | 1558 |
| Notched impact/(Kj/m) of cantilever beam 2 ） | 69 | 73 | 78 | 65 | 51 | 63 | 61 | 46 | 62 |
| Tiger stripe/grade | 2 | 2 | 1 | 2 | 2 | 3 | 3 | 2 | 2 |
| Flame retardant properties | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 |
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the disclosure of the present invention should be included in the scope of the present invention as set forth in the appended claims.
Claims (6)
1. The preparation method of the automobile bumper is characterized by comprising the following steps:
s1: mixing 70-90 parts of polypropylene matrix, 15-25 parts of polyolefin elastomer and 3-5 parts of polyvinylpyrrolidone, and melting and mixing at 160-180 ℃ until the mixture is uniform; then adding 1-3 parts of glycerol, heating to 260-280 ℃ at the speed of 3-5 ℃/min, and carrying out heat preservation reaction for 5-10min to obtain a material A;
s2: uniformly mixing 1-3 parts of nano molybdenum disulfide, 0.5-1 part of nano silicon dioxide, 1-3 parts of graphene powder and 20-30 parts of absolute ethyl alcohol to obtain a material B; adding the material B into the material A obtained in the step S1, and stirring and reacting at the temperature of 80-100 ℃ for 25-35min to obtain a material C;
s3: adding 2-5 parts of alginate fibers, 1-3 parts of magnesium sulfate whiskers and 3-6 parts of lauryl acrylate into the material C obtained in the step S2, raising the temperature to 140-160 ℃, and reacting for 30-50min with stirring to obtain a material D;
s4: reacting 1-3 parts of wollastonite with 0.5-1.5 parts of titanate coupling agent to obtain modified wollastonite; then adding the mixture into the material D obtained in the step S3, and continuously stirring and reacting for 25-45min at the temperature of 160-180 ℃ to obtain a material E;
s5: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of the screw at 42-50r/min and the temperature of each section at 180-220 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling the material by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 210-230 ℃, the injection molding time is 16-25s, and carrying out sand blasting, polishing, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
2. The preparation method of the automobile bumper as claimed in claim 1, wherein the polypropylene matrix is 80 parts, the polyolefin elastomer is 18 parts, the polyvinylpyrrolidone is 4 parts, the glycerol is 2 parts, the nano molybdenum disulfide is 2 parts, the nano silicon dioxide is 0.8 part, the graphene powder is 2.5 parts, the absolute ethyl alcohol is 25 parts, the alginate fiber is 4 parts, the magnesium sulfate whisker is 2 parts, the lauryl acrylate is 4 parts, the wollastonite is 2 parts, and the titanate coupling agent is 1 part.
3. The method for manufacturing an automobile bumper according to claim 1, wherein the step S2 is specifically: uniformly mixing nano molybdenum disulfide, nano silicon dioxide, graphene powder and absolute ethyl alcohol according to a proportion to obtain a material B; adding the material B into the material A obtained in the step S1, and stirring and reacting for 35min at the temperature of 90 ℃ to obtain a material C.
4. The method for manufacturing an automobile bumper according to claim 1, wherein the step S3 is specifically: and (3) adding alginate fibers, magnesium sulfate whiskers and lauryl acrylate into the material C obtained in the step (S2), raising the temperature to 150 ℃, and stirring to react for 35min to obtain a material D.
5. The method for manufacturing an automobile bumper according to claim 1, wherein the step S4 is specifically: reacting wollastonite with a titanate coupling agent in proportion to obtain modified wollastonite; and adding the mixture into the material D obtained in the step S3, and continuously stirring and reacting for 30min at the temperature of 170 ℃ to obtain a material E.
6. The method for manufacturing an automobile bumper according to claim 1, wherein the step S5 is specifically: putting the material E obtained in the step S4 into a double-screw extruder, controlling the rotating speed of the screws at 46r/min and the temperature of each section at 200 ℃, and fully plasticizing, melting, compounding, extruding, bracing, granulating and cooling by the double-screw extruder to obtain the composite material for the automobile bumper; and carrying out injection molding on the obtained composite material for the bumper by an injection molding machine to obtain a finished product, wherein the injection molding temperature is 215 ℃, the injection molding time is 18s, and carrying out sand blasting, paint spraying and waxing on the outer surface of the integrally molded automobile bumper to obtain the automobile bumper.
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| CN101693777B (en) * | 2009-09-18 | 2011-08-24 | 苏州禾盛新型材料股份有限公司 | Material for vehicle bumper and preparation method thereof |
| WO2012157709A1 (en) * | 2011-05-18 | 2012-11-22 | 三井化学株式会社 | Propylene copolymer and propylene copolymer composition, molding and foam thereof, and processes for producing said molding and foam |
| CN104292635A (en) * | 2014-09-30 | 2015-01-21 | 苏州博利迈新材料科技有限公司 | Car bumper composite material with ultrahigh impact strength and preparation method thereof |
| CN107987449B (en) * | 2017-12-15 | 2021-02-09 | 会通新材料股份有限公司 | Micro-foaming polypropylene composite material for automobile bumper and preparation method thereof |
| CN111978640A (en) * | 2019-10-17 | 2020-11-24 | 四川鑫达企业集团有限公司 | Graphene modified polypropylene composite material for bumper and preparation method thereof |
| CN112662053A (en) * | 2020-12-09 | 2021-04-16 | 上海普利特复合材料股份有限公司 | Low-density high-performance modified polypropylene composite material for vehicle bumper and preparation method thereof |
| CN112646275B (en) * | 2020-12-23 | 2022-06-14 | 苏州度辰新材料有限公司 | Conductive polyolefin master batch and preparation method thereof |
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