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Transverse-grain-resistant, wall-shrinkage-resistant and low-warping polypropylene composite

A technology of anti-tiger-skin and composite materials, which is applied in the field of anti-tiger-skin, anti-shrinkage, and low-warp polypropylene composite materials. It can solve the problem of affecting the appearance of products, limiting the use of polypropylene materials, and slow cooling and solidification. And other problems, to improve product quality, good compatibility, increase the effect of mechanical properties

Inactive Publication Date: 2016-12-21
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the large shrinkage rate of the polypropylene material itself and the crystalline material, the cooling and solidification speed after injection molding is slow, and there are positions where the thickness changes in the part, and sink marks are prone to appear. This surface defect seriously affects the appearance of the product. degree, and is still visible after spraying, which greatly limits the use of polypropylene materials in exterior parts

Method used

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  • Transverse-grain-resistant, wall-shrinkage-resistant and low-warping polypropylene composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 100 parts of polypropylene, 10 parts of K resin, 15 parts of porous silica filler, 1 part of compatibilizer, and 0.5 parts of auxiliary agent in parts by weight. The polypropylene is according to ASTMD1238-99, the condition is 230 ° C / 2.16 kg , The measured melt flow rate is 10-30g / 10min.

[0019] In the present invention, K resin refers to styrene-butadiene transparent impact-resistant resin, and the porous silica filler is porous silica microspheres.

[0020] Dry mix the above raw materials in a high-speed mixer for 10 minutes, then melt and extrude them in a twin-screw extruder, and granulate to obtain the polypropylene composite material of the present invention. The process control conditions are: 180-190 ℃, 200~210℃ in the second zone, 200~210℃ in the third zone, 210~215℃ in the fourth zone, 210~215℃ in the fifth zone, 210~215℃ in the sixth zone, 215~225℃ in the seventh zone, 215~225℃ in the eighth zone , 215-225°C in the ninth zone, 215-225°C in the tent...

Embodiment 2

[0023] (1) First prepare porous silica microspheres with hydrocarbon groups on the surface: place the porous polymer microspheres in ethanol for ultrasonication, then add ammonia water, methyl orthosilicate or ethyl orthosilicate in ethanol solution, After stirring and reacting for 20 hours, wash, dry, and finally place it in a muffle furnace for calcination to obtain unmodified silica microspheres, and then use chemical methods to graft hydrocarbon groups on the surface of unmodified silica microspheres to obtain surface-modified hydrocarbon groups Porous silica microspheres with a particle size of 10 μm and a pore size of

[0024] (2) Weigh 100 parts of polypropylene, 18 parts of K resin, 20 parts of porous silica filler, 8 parts of compatibilizer, and 0.1 part of auxiliary agent in parts by weight. The polypropylene is based on ASTMD1238-99 and the condition is 230 ° C / 2.16kg, the measured melt flow rate is 10-30g / 10min.

[0025] (3) The above raw materials were melt-bl...

Embodiment 3

[0027] (1) First prepare porous silica microspheres with hydrocarbon groups on the surface: place the porous polymer microspheres in ethanol for ultrasonication, then add ammonia water, methyl orthosilicate or ethyl orthosilicate in ethanol solution, After stirring and reacting for 20 hours, wash, dry, and finally place it in a muffle furnace for calcination to obtain unmodified silica microspheres, and then use chemical methods to graft hydrocarbon groups on the surface of unmodified silica microspheres to obtain surface-modified hydrocarbon groups Porous silica microspheres; the particle size is 5 μm, and the pore size

[0028] (2) Weigh 100 parts of polypropylene, 10 parts of K resin, 10 parts of porous silica filler, 5 parts of compatibilizer, and 0.6 parts of auxiliary agent according to parts by weight. / 2.16kg, the measured melt flow rate is 10-30g / 10min.

[0029] (3) The above raw materials were melt-blended to prepare polypropylene composite material, and the prepa...

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Abstract

The invention discloses a transverse-grain-resistant, wall-shrinkage-resistant and low-warping polypropylene composite. The transverse-grain-resistant, wall-shrinkage-resistant and low-warping polypropylene composite is prepared from, by weight, 100 parts of polypropylene, 10-20 parts of K resin, 1-20 parts of porous silicon dioxide filler, 1-10 parts of compatilizer and 0.1-1 part of assistant, the flowing rate, measured by polypropylene according to ASTMD1238-99 and the conditions of 230 DEG C / 2.16 kg, of a solution is 10-30 g / 10 min. The composite is good in compatibility and easy to process, and the problems of transverse grain, wall shrinkage, warping and the like of an injection molding part can be relieved.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a tiger-skin-resistant, shrinkage-resistant and low-warp polypropylene composite material. Background technique [0002] Due to the excellent performance of engineering plastics, they are more in line with the trend of energy conservation and environmental protection. In recent years, engineering plastics have been widely used in electronics, automobiles, construction, office equipment, machinery, aerospace and other industries. Substituting plastics for steel and plastics for wood has become international fashion trends. Especially PP engineering plastics, PP modified materials occupy the first place in automotive plastics. Now there are about 60 PP parts for automobiles, and the number will increase to more than 100 in five years. The application prospects are very broad. According to reports, 1% reduction in weight of general parts of a car can save fuel by nearly 1%, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L53/02C08L51/06C08K13/06C08K9/00C08K7/26
CPCC08L23/12C08L2205/03C08K2201/003C08L53/02C08L51/06C08K13/06C08K9/00C08K7/26
Inventor 汪理文李庆贵孙兆才董骏周明翁永华丁贤麟
Owner SUZHOU RUNJIA ENGINEER PLASTIC
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