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Special low post-shrinkage polypropylene composite material for vehicle bumpers, and preparation method thereof

A composite material and polypropylene technology, which is applied in the field of low aftershrinkage polypropylene composite materials for automobile bumpers and its preparation, can solve the problems of reduced material modulus, reduced material toughness, increased cost, etc., and achieves excellent comprehensive performance and reduced Shrinkage, the effect of easy mass production

Inactive Publication Date: 2017-12-22
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Add fillers or increase the amount of fillers, such as glass fiber powder, calcium carbonate, mica, etc.; but adding fillers or increasing the amount of fillers will inevitably lead to a decrease in the toughness of the material;
[0006] 2. Adding glass fiber will bring about injection molding problems such as floating fiber and warping;
[0007] 3. Increasing the content of the toughening agent will increase the cost and reduce the modulus of the material

Method used

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  • Special low post-shrinkage polypropylene composite material for vehicle bumpers, and preparation method thereof
  • Special low post-shrinkage polypropylene composite material for vehicle bumpers, and preparation method thereof
  • Special low post-shrinkage polypropylene composite material for vehicle bumpers, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The first step: Weigh 15 parts of wollastonite in high-speed mixer A, then add 0.08 parts of lubricant zinc stearate and 0.12 parts of lubricant ethylene bis-stearic acid amide and mix for 20 minutes, then take out the mixed 2 / 5 of the total weight of wollastonite was used for later use, and then 10 parts of 3000-mesh glass fiber powder were weighed and mixed in high-speed mixer A for 20 minutes; the speed of high-speed mixer A was 200 rpm and the temperature was 50 °C.

[0045] Step 2: Weigh 60 parts of polypropylene BX3900, 40 parts of polypropylene EP5077, 15 parts of polycarbonate, 15 parts of toughening agent POE 8150, 7 parts of toughening agent EM-500A, and 3 parts of toughening agent SEBS G1652. In mixer B, 0.25 part of nucleating agent HPN-20E and 0.2 part of coupling agent KH550 were then added and mixed for 20 minutes. The rotational speed of the high-mixer B was 200 rpm, and the temperature was 50°C.

[0046] The third step: add the mixture in the high-spee...

Embodiment 2

[0049] The first step: Weigh 45 parts of wollastonite in high-speed mixer A, then add 0.21 parts of lubricant zinc stearate and 0.19 parts of lubricant ethylene bis-stearic acid amide and mix for 30 minutes, then take out the mixed 2 / 5 of the total weight of wollastonite was used for later use, and then 35 parts of 5000-mesh glass fiber powder were weighed and mixed in high-speed mixer A for 30 minutes. The rotational speed of the high-mixer A was 300 rpm, and the temperature was 70°C.

[0050] The second step: Weigh 58 parts of polypropylene BX3920, 42 parts of polypropylene EP5077, 30 parts of polycarbonate, 30 parts of toughening agent POE 8150, 10 parts of toughening agent EM-500A, 5 parts of toughening agent SEBS G1652 at high speed In mixer B, 0.5 part of nucleating agent HPN-20E and 0.3 part of coupling agent KH550 were then added and mixed for 30 minutes. The rotational speed of the high-mixer B was 300 rpm, and the temperature was 70°C.

[0051]The third step: add t...

Embodiment 3

[0054] The first step: Weigh 21 parts of wollastonite in high-speed mixer A, then add 0.09 parts of lubricant zinc stearate and 0.17 parts of lubricant ethylene bis-stearic acid amide and mix for 23 minutes, then take out the mixed 2 / 5 of the total weight of wollastonite was used for later use, and then 12 parts of 5000-mesh glass fiber powder were weighed and mixed in high-speed mixer A for 27 minutes. The rotational speed of the high mixer A was 234 rpm, and the temperature was 57°C.

[0055] Step 2: Weigh 43 parts of polypropylene K7760H, 57 parts of polypropylene EP5077, 19 parts of polycarbonate, 19 parts of toughening agent POE 8150, 7 parts of toughening agent EM-500A, and 5 parts of toughening agent SEBS G1652. In mixer B, 0.29 parts of nucleating agent HPN-20E and 0.24 parts of coupling agent KH550 were then added and mixed for 24 minutes. The rotational speed of the high mixer B was 209 rpm, and the temperature was 59°C.

[0056] The third step: add the mixture in ...

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Abstract

The invention provides a special low post-shrinkage polypropylene composite material for vehicle bumpers, wherein 100 parts of polypropylene, 15-30 parts of polycarbonate, 15-45 parts of wollastonite, 10-35 parts of high mesh glass fiber powder, 25-45 parts of a toughening agent, 0.25-0.5 part of a nucleating agent, 0.4-0.8 part of a lubricant, 0.2-0.3 part of a coupling agent and 0.15-0.4 part of an antioxidant are subjected to by step by step mixing and extrusion granulation to prepare the special low post-shrinkage polypropylene composite material, and the particle size of the high mesh glass fiber powder is 3000-5000 mesh. According to the present invention, the special low post-shrinkage polypropylene composite material has advantages of low shrinkage, strong mechanical property, good dimensional stability 24-48 h after injection molding and low post-shrinkage after spray coating, and can be used as vehicle bumpers and the like.

Description

Technical field: [0001] The invention relates to the field of polymer material modification, in particular to a special low post-shrinkage polypropylene composite material for automobile bumpers and a preparation method thereof. Background technique: [0002] Polypropylene (PP) is widely used due to its low price, easy processing and molding, low density, chemical resistance and excellent physical and mechanical properties. It has become one of the fastest-growing general-purpose plastics. For automobile bumpers, high dimensional stability is required, that is, the shrinkage of the material is small after 24h to 48h of injection molding, and the post-shrinkage should also be kept small after the material is sprayed, coated and other post-processing processes. [0003] At present, most automobile OEMs use polypropylene modified materials as PP+EPDM-TD15~TD30 materials. The shrinkage rate of such materials after injection molding for 24h~48h is 0.8~1.3%. After spraying for 24h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L69/00C08L23/08C08L53/02C08K13/06C08K3/34C08K5/098C08K5/20C08K7/14B29C47/92B29C48/92
CPCC08L23/14B29C48/92B29C2948/92704C08K2201/014C08L2205/025C08L2205/035C08L2205/06C08L2205/24C08L69/00C08L23/0815C08L53/025C08K13/06C08K3/34C08K5/098C08K5/20C08K7/14
Inventor 杨桂生杨莺李术
Owner HEFEI GENIUS NEW MATERIALS
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