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Low-after-shrinkage polypropylene composite material for automobile bumper and preparation method thereof

A composite material, polypropylene technology, applied in the field of low post-shrinkage polypropylene composite material and its preparation, can solve the problems of glass fiber floating fiber, material toughness decrease, modulus decrease, etc., achieve excellent comprehensive performance, reduce shrinkage rate, The effect of easy mass production

Inactive Publication Date: 2018-05-25
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above three methods are: 1. Adding fillers or increasing the amount of fillers will inevitably lead to a decrease in material toughness; 2. Adding glass fibers will inevitably bring about injection molding problems such as floating fibers and warping; 3. Adding toughening agents content can cause problems of increased cost and lower modulus

Method used

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  • Low-after-shrinkage polypropylene composite material for automobile bumper and preparation method thereof
  • Low-after-shrinkage polypropylene composite material for automobile bumper and preparation method thereof
  • Low-after-shrinkage polypropylene composite material for automobile bumper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Weigh 15 parts of calcined kaolin 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 modified 2 / 5 of the total weight of calcined kaolin is reserved; then take 10 parts of 3000 mesh glass fiber powder in high-speed mixer A and mix with 3 / 5 of the total weight of modified calcined kaolin for 20 minutes; the speed of high mixer A is 200 rpm, temperature 50°C.

[0038] Step 2: Weigh 60 parts of polypropylene BX3900, 40 parts of polypropylene EP5077, 15 parts of polypropylene grafted maleic anhydride, 15 parts of toughening agent POE 8150, 7 parts of toughening agent EM-500A, 3 parts of toughening agent Put SEBS G1652 in high-speed mixer B, then add 0.25 parts of nucleating agent HPN-20E, 0.2 parts of coupling agent KH550 and mix for 20 minutes. The speed of the high mixer B is 200 rpm, and the temperature is 50°C.

[0039] Step 3: Add the...

Embodiment 2

[0042] Step 1: Weigh 45 parts of calcined kaolin 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 modified 2 / 5 of the total weight of the calcined kaolin was used for later use; then 35 parts of 5000 mesh glass fiber powder were weighed and mixed with 3 / 5 of the total weight of the modified calcined kaolin in the high-speed mixer A for 30 minutes. The rotating speed of high mixer A is 300 rpm, and the temperature is 70°C.

[0043] Step 2: Weigh 58 parts of polypropylene BX3920, 42 parts of polypropylene EP5077, 30 parts of polypropylene grafted maleic anhydride, 30 parts of toughening agent POE 8150, 10 parts of toughening agent EM-500A, 5 parts of toughening agent Put SEBS G1652 in high-speed mixer B, then add 0.5 parts of nucleating agent HPN-20E, 0.3 parts of coupling agent KH550 and mix for 30 minutes. The speed of the high mixer B is 300 rpm, a...

Embodiment 3

[0047] Step 1: Weigh 21 parts of calcined kaolin 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 modified 2 / 5 of the total weight of the calcined kaolin is used for later use; then, 12 parts of 5000-mesh glass fiber powder are weighed and mixed with 3 / 5 of the total weight of the modified calcined kaolin in the high-speed mixer A for 27 minutes. The rotating speed of high mixer A is 234 rpm, and the temperature is 57°C.

[0048] Step 2: Weigh 43 parts of polypropylene K7760H, 57 parts of polypropylene EP5077, 19 parts of polypropylene grafted maleic anhydride, 19 parts of toughening agent POE 8150, 7 parts of toughening agent EM-500A, 5 parts of toughening agent Put SEBS G1652 in high-speed mixer B, then add 0.29 parts of nucleating agent HPN-20E, 0.24 parts of coupling agent KH550 and mix for 24 minutes. The speed of high mixer B is 209 rpm, and t...

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Abstract

The invention provides a low-after-shrinkage polypropylene composite material for an automobile bumper and a preparation method thereof. The low-after-shrinkage polypropylene composite material is prepared from the following components: 100 parts of polypropylene, 15 to 30 parts of polypropylene grafted maleic anhydride, 15 to 45 parts of calcined kaolin, 10 to 35 parts of diatomite, 25 to 45 parts of a toughening agent, 0.25 to 0.5 part of a nucleating agent, 0.4 to 0.8 part of a lubricant, 0.2 to 0.3 part of a coupling agent and 0.15 to 0.4 part of an antioxidant; the low-after-shrinkage polypropylene composite material is prepared through mixing by steps, extruding and granulating. The polypropylene composite material provided by the invention has the advantages of low shrinkage rate and strong mechanical property; after the low-after-shrinkage polypropylene composite material is subjected to injection molding for 24h to 48h, the size stability is good and relatively small after-shrinkage is kept after the material is sprayed; the low-after-shrinkage polypropylene composite material can be used as the automobile bumper and the like.

Description

Technical field: [0001] The invention relates to the field of polymer material modification, in particular to a low aftershrinkage polypropylene composite material used 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 corrosion resistance and excellent physical and mechanical properties, and 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 of the material should also be kept small after spraying, coating 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 this material is 0.8~1.3% after injection molding for 24h~48h, and the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/08C08L51/06C08L51/04C08L53/02C08K13/06C08K3/34C08K5/098B29C47/92B29C48/92
CPCB29C48/92B29C2948/92704C08L23/14C08L2205/025C08L2205/035C08L2205/24C08L23/0815C08L51/06C08L51/04C08L53/025C08K13/06C08K3/346C08K3/34C08K5/098
Inventor 杨桂生杨莺李术姚晨光
Owner HEFEI GENIUS NEW MATERIALS
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