Stress-whitening-resistant polypropylene composite material

Abstract

The invention provides a stress-whitening-resistant polypropylene composite material. The stress-whitening-resistant polypropylene composite material comprises the following materials in parts by weight: 40-85 parts of polypropylene resin, 4-7 parts of stress-whitening-resistant agent, 15-45 parts of filling agent, 5-15 parts of compatilizer, 0.1-1.0 part of antioxygen, and 0.5-2 part of processing additive, wherein the polypropylene resin is co-polypropylene of polypropylene and polyethylene, and the weight ratio of polypropylene to polyethylene in the co-polypropylene is (95: 5)-(99: 1); the stress-whitening-resistant agent is one of or the mixture of more of TiO2, MnO2, ZnO and ZrO2. The stress-whitening-resistant polypropylene composite material has excellent stress-whitening resistance and favorable comprehensive mechanical property, and is relatively low in economic cost and suitable for mass production and application in industries of automobiles and the like.

Description

technical field [0001] The invention relates to a polymer material technology, and more specifically, relates to a stress-whitening-resistant polypropylene composite material. Background technique [0002] Polypropylene is a general-purpose plastic with a wide range of uses. It is polymerized from propylene monomer and is a semi-crystalline plastic. According to the polymerization method and the arrangement of molecular segments, it is mainly divided into two categories: copolymerization and homopolymerization. Ordinary polypropylene (PP) resin is difficult to meet the application requirements of various industries, and the application range of modified polypropylene materials has been very wide, such as automobiles and home appliance industries. Modified polypropylene is used as the material of the automobile door panel. It must not only have good rigidity and impact resistance, but also have certain weather resistance and thermal oxidation resistance. At the same time, it ...

AI Technical Summary

Problems solved by technology

[0003] When modified polypropylene is used for injection molding products, the external force received during the ejection process of the injection molding process is more concentrated on the position of the ejector pin or ejector pin, so that the material generates silver streaks at this position and expands the silver streak area to absorb external energy, while The generation and expansion of the silver streak area will lead to whitening of the part, affecting the appearance or resulting in unqualified products. This phenomenon is easy to occur in the production of relatively large parts such as automobile door panels.