Stress-whitening-resistant PP (propene polymer) plastics

Abstract

The invention discloses stress-whitening-resistant PP (propene polymer) plastics. The stress-whitening-resistant PP plastics consist of the following raw materials in part by weight: 90 parts of PP resin, 1-5 parts of POE (polyolefin elastomer) resin, 1-5 parts of stress-whitening-resistant agents, 2-6 parts of maleic anhydride grafted polypropylene and 0.1-0.9 part of antioxygen 1010. The stress-whitening-resistant PP plastics have high folding resistance and stress whitening resistance, and cannot be whitened after being repeatedly bent manually more than 200 times.

Description

technical field [0001] The invention relates to a PP plastic, in particular to a stress-whitening PP plastic. Background technique [0002] Polypropylene PP is one of the five types of general-purpose plastics. Because of its rich raw material sources, low price, easy processing and excellent product performance, it has a wide range of uses and has become the fastest-growing variety of general-purpose resins. It is widely used inside and outside the car. in accessories, electronics and home appliances. Although polypropylene has many advantages, it also has some shortcomings. For example, it does not achieve a good balance of rigidity and toughness. High-modulus polypropylene often cannot achieve high impact at the same time, and high-impact polypropylene cannot achieve high impact at the same time. High modulus; at the same time, some parts also require materials with good resistance to stress whitening and stress cracking. [0003] During the injection molding process of...

AI Technical Summary

Problems solved by technology

Although polypropylene has many advantages, polypropylene also has some disadvantages. For example, it does not achieve a good balance of rigidity and toughness. High-modulus polypropylene often cannot achieve high impact at the same time, and high-impact polypropylene cannot achieve both. High modulus; at the same time, some parts also require the material to have good resistance to stress whitening and stress cracking

[0003] During the injection molding process of polypropylene PP products, the force tends to be relatively concentrated at the ejection part, and silver streaks are generated at the stressed part, and a large number of tiny internal cracks are generated in the silver streak area. The top white phenomenon leads to unqualified product appearance; some polypropylene products are in use, and some special structures such as clip feet are easy to be stressed, resulting in stress whitening and cracking