Polypropylene composition with high fluidity and high dimensional stability and preparation method thereof

Abstract

The invention discloses polypropylene composition with high fluidity and high dimensional stability and a preparation method thereof. The polypropylene composition with high fluidity and high dimensional stability comprises components in parts by weight as follows: 10-60 parts of homo-polypropylene, 10-40 parts of co-polypropylene, 10-25 parts of thermoplastic elastomer, 3-8 parts of polyethylene, 0-35 parts of mineral fillers, 0.2-1 part of a heat stabilizer, 0.2-1 part of a light stabilizer, 0.3-1 part of a coupling agent and 0.5-3 parts of other auxiliaries. The preparation method comprises the steps as follows: raw materials are weighed in the ratio in parts by weight; the raw materials are stirred and mixed for 2-8 min at a low speed to obtain a premixed material; and the premixed material is added into a double-screw extruder for melt blending and extruding granulation. According to the invention, a product has high fluidity, low shrinking percentage and good dimensional stability; and a production formula is mature, an extrusion process is simple, the product performance can be regulated according to the formula and is controllable, and an injection molding process has a wide range.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a polypropylene composition with high fluidity and high dimensional stability and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, polypropylene (PP) composite materials with light weight, corrosion resistance, heat resistance, aging resistance, impact resistance, and balance of rigidity and toughness have been increasingly used. Modified PP is used in automobiles today. There are more than a dozen parts of the material, and the automobile bumper formed by modified PP material is the most representative part, and the design of the current bumper tends to be thinner, which requires the material to have good fluidity and high toughness. Good dimensional stability. Automobile bumper products have two shrinkage processes before assembly, that is, shrinkage after demoulding and cooling during inject...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a high flow and high dimensional stability polypropylene composition and its preparation method, which can better control the dimensional fluctuations of large thin-walled sprayed products during injection molding and baking spraying Scope; solve the problem of appearance defects that are easy to occur when large thin-walled sprayed products are injection molded

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