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CN-121975238-A - High-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material and preparation method thereof

CN121975238ACN 121975238 ACN121975238 ACN 121975238ACN-121975238-A

Abstract

The invention provides a high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material and a preparation method thereof, wherein the composite material comprises, by weight, 64.2-79.3% of linear copolymer polypropylene, 15-25% of polyolefin elastomer, 5-8% of long-chain branched polypropylene, 0.2-1% of scratch resistant agent, 0.2-1% of antioxidant, 0.2-0.5% of light stabilizer and 0.1-0.3% of beta nucleating agent. The polypropylene composite material obtained by adopting the technical scheme has the characteristics of high modulus, low density, low shrinkage, low temperature and ultrahigh toughness, and simultaneously gives consideration to the illumination-resistant and scratch-resistant PP automotive interior material, meets the low-temperature explosion requirements of parts such as automotive interior posts, seat guard plates and the like, has the flexural modulus of more than or equal to 900MPa, the density of less than or equal to 0.92g/cm <3 >, the shrinkage rate of less than or equal to 1.4%, the notch impact strength of less than or equal to 9KJ/m < 2 >, no fragments are generated after a low-temperature-40 ℃ static ignition test of a finished piece, and more than 70% of buckles still remain connected.

Inventors

  • YANG XINGCHENG
  • ZHANG JIE
  • ZHOU ZHENLUN
  • ZHOU WEN
  • LIU XINCHAO
  • YANG FAN
  • SUN JINGBO
  • ZENG XU
  • WANG YONG
  • ZHAO LIPING
  • YIN JIAXING
  • WANG YI

Assignees

  • 上海普利特复合材料股份有限公司
  • 重庆普利特新材料有限公司
  • 上海普利特化工新材料有限公司
  • 浙江普利特新材料有限公司

Dates

Publication Date
20260505
Application Date
20251222

Claims (13)

  1. 1. The high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material is characterized by comprising the following raw materials in percentage by weight: 64-79.2% of linear copolymer polypropylene; 15-25% of polyolefin elastomer; 5-8% of long-chain branched polypropylene; 0.2-1% of scratch resistant agent; 0.2-1% of heat stabilizer; 0.2 to 0.5 percent of light stabilizer; 0.1 to 0.3 percent of beta nucleating agent.
  2. 2. The high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material according to claim 1, wherein the linear copolymer polypropylene has a weight average molecular weight of 10-6, a molecular weight distribution width of 1-20, a melt flow rate of 0.1-100g/10min and an ethylene content of 6-14wt%.
  3. 3. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite material according to claim 2, wherein the polypropylene has a weight average molecular weight of 2 x 10 x 5 to 5 x 10 x 5, a molecular weight distribution width of 4 to 10, a melt flow rate of 20 to 60g/10min (230 ℃,2.16 kg), and an ethylene content of 8 to 12wt%.
  4. 4. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite according to claim 1, wherein the polyolefin elastomer is selected from one or a combination of two or more of ethylene-butene copolymer, ethylene-octene copolymer (POE), and has a melt flow rate (190 ℃ x 2.16 kg) of 0.1-60g/10min.
  5. 5. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite according to claim 4, wherein said polyolefin elastomer is selected from the group consisting of ethylene-octene copolymers (POE) having a melt flow rate of 1 to 30g/10min.
  6. 6. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite according to claim 1, wherein the long chain branched polypropylene has a branching degree of 0.05-0.5, a melt flow rate of 0.1g/10min-10g/10min at 230 ℃, preferably a branching degree of 0.2-0.4, a melt flow rate of 1g/10min-4g/10min at 230 ℃.
  7. 7. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite of claim 1, wherein said scratch resistant agent is one or a combination of erucamide and oleamide.
  8. 8. The high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material according to claim 1, wherein the heat stabilizer mixture comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a hindered phenol or thioester antioxidant, is selected from 3114, 1010 and/or DSTP, and the auxiliary antioxidant is a phosphite or ester antioxidant, and is selected from 618 and/or 168.
  9. 9. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite material according to claim 1, wherein the light stabilizer is one or more of hindered amine and hindered benzoate.
  10. 10. The high modulus, low density, low shrinkage, low temperature super tough polypropylene composite according to claim 1, wherein the β -type nucleating agent is an aromatic carboxylate or an aliphatic dicarboxylic acid salt, including but not limited to one or more of barium tetrahydrophthalate (PA 4-Ba), calcium tetrahydrophthalate (PA 4-Ca), zinc adipate (Adi-Zn), barium adipate (Adi-Ba).
  11. 11. The method for preparing the high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material according to any one of claims 1 to 10, which is characterized by comprising the steps of putting the linear copolymer polypropylene, polyolefin elastomer, long-chain branched polypropylene, scratch resistant agent, heat stabilizer, light stabilizer and beta-type nucleating agent together into a double-screw extruder for melt mixing and dispersing, extruding and granulating by the double-screw extruder to obtain the polypropylene composite material, then injecting the polypropylene composite material into a required part product on an injection molding machine, and preparing the part product into 80mm multiplied by 10mm multiplied by thickness standard bars required by mechanical property test by an engraving and sample cutting machine.
  12. 12. The method for preparing the high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material according to claim 11, wherein the temperature of each section of the twin-screw extruder is set to be 190-240 ℃ in the extrusion granulation process, and the temperature of each section of the injection molding machine is set to be 190-240 ℃ in the injection molding process.
  13. 13. The method for preparing the high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material according to claim 12, wherein the temperature of each section of the twin-screw extruder is set to be 200-220 ℃ in the extrusion granulation process, and the temperature of each section of the injection molding machine is set to be 200-220 ℃ in the injection molding process.

Description

High-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material and preparation method thereof Technical Field The invention relates to a high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material and a preparation method thereof. Background The PP (polypropylene) can be modified by toughening, filling, reinforcing, blending and other modification methods to obtain materials with different properties, and the modified PP is widely applied to automobile interior and exterior trim due to lower cost and excellent comprehensive properties, and particularly the raw material for injection molding of the automobile interior trim is mainly modified polypropylene material. Because the low-temperature toughness of the polypropylene material is poor and the shrinkage rate is large, the toughness of the material is improved, the shrinkage rate is reduced and the toughness is improved by commonly modifying the polypropylene with a toughening agent and talcum powder, but the modified polypropylene prepared by the traditional modification method improves the density of the material, and the notch impact of the low-temperature toughness of the modified polypropylene at-30 ℃ is only 2-4kJ/m < 2 >, so that the modified polypropylene cannot meet the requirements of some extremely cold areas. There is a need to develop a polypropylene composite material with high modulus, low density, low shrinkage, low temperature super toughness and low manufacturing cost and an automotive interior trim part thereof. Disclosure of Invention The invention aims to solve the problem of providing the polypropylene composite material with high modulus, low density, low shrinkage and low temperature super toughness for the automotive interior trim with blasting requirement, and the polypropylene composite material has excellent mechanical property, meets the low-temperature blasting requirement of parts, and simultaneously plays a role in reducing the weight of the parts. The invention can be implemented by the following technical scheme. The high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material comprises the following raw materials in percentage by weight: 64-79.2% of linear copolymer polypropylene; 15-25% of polyolefin elastomer; 5-8% of long-chain branched polypropylene; 0.2-1% of scratch resistant agent; 0.2-1% of heat stabilizer; 0.2 to 0.5 percent of light stabilizer; 0.1 to 0.3 percent of beta nucleating agent. In the polypropylene composite material, the polypropylene composite material is prepared from the following components, The linear copolymer polypropylene has a weight average molecular weight of 10-6, a molecular weight distribution width of 1-20, a melt flow rate of 0.1-100g/10min (230 ℃ C., 2.16 kg), an ethylene content of 6-14wt%, preferably a polypropylene having a weight average molecular weight of 2 x 10-5, a molecular weight distribution width of 4-10, a melt flow rate of 20-60 g/10min (230 ℃ C., 2.16 kg) and an ethylene content of 8-12 wt%. The polyolefin elastomer is selected from one or more than two of ethylene-butene copolymer and ethylene-octene copolymer (POE), and has a melt flow rate (190 ℃ C. Times.2.16 kg) of 0.1-60g/10min, preferably ethylene-octene copolymer (POE) and a melt flow rate (190 ℃ C. Times.2.16 kg) of 1-30g/10min. The branching degree of the long-chain branched polypropylene is 0.05-0.5, the melt flow rate at 230 ℃ is 0.1g/10 min-10 g/10min, preferably the branching degree of the long-chain branched polypropylene is 0.2-0.4, and the melt flow rate at 230 ℃ is 1g/10 min-4 g/10min. The scratch resistant agent is one or a combination of erucamide and oleamide. The heat stabilizer mixture comprises a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is hindered phenol or thioester antioxidants, and comprises one or more of 3114 (chemical name is 1,3, 5-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) -1,3, 5-triazine-2, 4,6[1H,3H,5H ] trione), 1010 (chemical name is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester) and DSTP (chemical name is stearyl thiodipropionate), and the secondary antioxidant is phosphite or ester antioxidants, and comprises one or more of 618 (chemical name is dioctadecyl pentaerythritol bisphosphite) and 168 (chemical name is tri (2, 4-di-tert-butylphenyl) phosphite). The light stabilizer is one or more of hindered amine and hindered benzoate. The beta-type nucleating agent is aromatic carboxylate or aliphatic dicarboxylic carboxylate, and comprises one or more of barium tetrahydrophthalate (PA 4-Ba), calcium tetrahydrophthalate (PA 4-Ca), zinc adipate (Adi-Zn) and barium adipate (Adi-Ba). The preparation method of the high-modulus, low-density, low-shrinkage and low-temperature super-tough polypropylene composite material comprises the steps of putting the linear copolymer polypr