Polypropylene material with low linear expansion coefficient and preparation method of polypropylene material

Abstract

The invention relates to a polypropylene material with a low linear expansion coefficient and a preparation method of the polypropylene material. The polypropylene material with the low linear expansion coefficient is prepared from the following raw materials: polypropylene resin, a functional ethylene-octylene copolymer, a compatilizer, talcum powder, flat glass fiber, an antioxidant and a weather resistant agent. By adjusting components and proportions of the raw materials, the polypropylene material has the low linear expansion coefficient and good mechanical properties, and can be appliedto automobile bumpers, apron boards and the like.

Description

technical field [0001] The invention relates to the field of materials, in particular to a polypropylene material with a low linear expansion coefficient and a preparation method thereof. Background technique [0002] Polypropylene has been widely used in the interior and exterior of automobiles because of its excellent comprehensive performance, wide range of sources, light weight and low price, and easy molding and processing. In automotive exterior parts, such as automobile bumpers, skirts, fenders, etc., are in a state of alternating cold and heat for a long time, resulting in large changes in material size, resulting in assembly gaps or deformation, so materials are required to have a low linear expansion coefficient . [0003] At present, the shrinkage rate of the material is mainly reduced by adding toughening agent (POE) and increasing the proportion of talcum powder to meet the requirement of low linear expansion. High talcum powder dosage will have a great impact ...

AI Technical Summary

Problems solved by technology

[0003] At present, the shrinkage rate of the material is mainly reduced by adding toughening agent (POE) and increasing the proportion of talcum powder to meet the requirement of low linear expansion. High talcum powder dosage will have a great impact on the impact performance of the material. ) amount will lead to higher cost and lower material rigidity

There are also problems such as reducing material shrinkage and linear expansion coefficient by adding glass fibers and whiskers, but it will cause problems such as product deformation

[0004] Chinese patent CN103044775A uses chopped glass fiber to reduce the linear expansion coefficient of the polypropylene composite material, and the large amount of glass fiber will cause the appearance of floating fibers and product warpage.

Chinese patents CN201511019839, CN201711167913, and CN201711447917 use whiskers and needle-shaped wollastonite to reduce the linear expansion coefficient of the material. The ratio of the length of the whiskers and wollastonite is relatively large, so that the shrinkage rate of the material flow direction and the vertical flow direction differ greatly. , will affect product size, warpage, etc.

Chinese patent CN201710726681 uses glass beads to reduce the linear expansion coefficient of the material. Glass beads are fragile during processing and difficult to process.

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