Stress whitening-resistant modified polypropylene material and preparation method thereof

Abstract

The invention discloses a stress whitening-resistant modified polypropylene material and a preparation method thereof. The stress whitening-resistant modified polypropylene material is prepared from the following raw materials in percentage by weight: 76 to 97.5 percent of polypropylene, 2 to 10 percent of nano calcium carbonate, 0.1 to 3 percent of nucleating agent, 0 to 5 percent of toughening agent polyolefin elastomer (POE), 0 to 4 percent of compatilizer, 0.1 to 2 percent of antioxidant and 0 to 3 percent of other aids. According to the stress whitening-resistant modified polypropylene material, the crystallinity of a polypropylene (PP) matrix is improved by utilizing the nucleating crystallization capacity of the nucleating agent; the nano calcium carbonate and the POE are combined to achieve an effect of synergetic toughening, and the stress whitening-resistant performance of copolymerization polypropylene is improved while the high mechanical performance of the modified polypropylene material is kept; and the prepared modified polypropylene material has high transparency, and also can be used for preparing plastic products with high transparency stress whitening resistance.

Description

technical field [0001] The invention relates to a stress-whitening-resistant modified polypropylene material, which is a modified polypropylene material with simple process, good stress-whitening resistance, and excellent transparency, and can be used to prepare some high-transparency, resistant Plastic products with high requirements for stress whitening, the present invention also relates to a preparation method of this polypropylene material. Background technique [0002] Polypropylene is one of the five general-purpose plastics. Due to its rich source of raw materials, low price, easy processing and excellent overall performance, it has a wide range of uses and has become the fastest-growing variety of general-purpose resins. It is widely used in automotive interior and exterior decoration hardware, electronics and home appliances. Although polypropylene has many advantages, polypropylene also has some disadvantages. For example, it does not achieve a good balance of ri...

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 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. Whitening phenomenon, resulting in 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

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