High-rigidity high-toughness low-density polypropylene composition and preparation method thereof

Abstract

The invention discloses a high-rigidity, high-toughness and low-density polypropylene composition and a preparation method thereof. The high-rigidity, high-toughness and low-density polypropylene composition is prepared from 71-78 parts by weight of polypropylene, 8-12 parts by weight of whiskers, 14-17 parts by weight of a toughening agent, 0.2-0.5 part by weight of an antioxidant and 0.2-0.5 part by weight of other assistants through mixing, extrusion and granulation. According to the preparation method of the high-rigidity, high-toughness and low-density polypropylene composition, high-crystallinity co-polypropylene is used as a base material; whisker with a certain length-diameter ratio is used for enhancing modification; it is ensured that the prepared composition has high strength; meanwhile, the impact strength of the composition is improved with the toughening agent with a high melt index; the prepared polypropylene has high rigidity and high toughness, and the addition amountof the whiskers is only 8-12%, so that the density of the product is controlled at 0.96 g / cm<3> and is 8-10% lower than the density of the conventional PP+EPDM-T20, the lightweight purpose is achieved; the polypropylene composition disclosed by the invention is simple in preparation process, simple and convenient to operate and relatively low in raw material cost.

Description

technical field [0001] The invention relates to the field of polymer material modification, in particular to a high-rigidity, high-toughness, low-density polypropylene composition and a preparation method thereof. Background technique [0002] Polypropylene has the advantages of good mechanical properties, non-toxicity, low relative density, heat resistance, chemical resistance, easy processing and molding, and low price. Through processing and modification, it can endow the resin with outstanding physical and mechanical properties, and thus replace some engineering plastics. In recent years, great progress has been made in the engineering of general-purpose plastics, and it is the fastest growing among the five general-purpose synthetic resins. The most active variety in the development of new varieties. [0003] With the rapid development of science and technology, the major OEMs in the automobile industry have new changes in the requirements for materials, especially in ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, traditional mineral-filled modified polypropylene materials are widely used in interior and exterior parts of automobiles, such as traditional instrument panels, door panels, and pillars, which use PP+EPDM-T20 materials with a density of 1.04-1.07g / cm 3 , has become increasingly unable to meet the automotive industry's requirements for lightweight materials

The traditional method of reducing density is to reduce the content of filler minerals. Although this method can reduce the density of the material, the rigidity and strength of the material cannot meet the actual performance design requirements of the material.

[0005] The patent number is CN 106750948A, which discloses a low-density, high-rigidity polypropylene composite material and its preparation method. The high-rigidity and low-density polypropylene composite material is prepared by using homopolypropylene, chopped carbon fibers, glass beads, and toughening agents. , but because of its pressure resistance and other problems, the hollow glass microspheres will cause problems such as rupture in the extruder, which will affect the density reduction effect. In addition, the high prices of glass microspheres and chopped carbon fibers will affect their popularization and use.

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