Glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as preparation method and application thereof

Abstract

The invention discloses a glass fiber-reinforced polypropylene material with shallow shrinkage mark and low warpage as well as a preparation method and an application of the glass fiber-reinforced polypropylene material. The polypropylene material is prepared by using the following raw materials including 45-79% of polypropylene, 15-30% of chopped glass fiber, 1-20% of mineral fillers and 2-5% of grafted polypropylene, wherein the polypropylene includes high crystalline polypropylene as well as homopolymerized polypropylene and/or copolymerized polypropylene; the mineral fillers are one or more of barium sulfate, calcium carbonate or mica.The preparation method for preparing the glass fiber-reinforced polypropylene material provided by the invention uses the high crystalline polypropylene, the added chopped glass fiber and the mineral fillers for composite reinforcement and can effectively increase the cooling and curing rates of the material during the injection moulding process. The prepared product has the characteristics of shallow shrinkage mark, low warpage and high surface gloss, has the advantages of high flexural strength and modulus, good processability and low cost, can be used in household appliances and automotive industries, and can replace engineering plastic, and meet the requirements of high dimensional stability, high wrap and high mechanical properties of the parts.

Description

technical field [0001] The invention belongs to the field of modified plastics, and in particular relates to a glass fiber reinforced polypropylene material with shallow sink marks and low warpage, a preparation method and application thereof. Background technique [0002] Glass fiber reinforced polypropylene has the advantages of high mechanical strength, good heat resistance, chemical corrosion resistance, dimensional stability, etc. It is widely used in household appliances, automobiles, machinery and other fields. The strength and modulus of glass fiber reinforced polypropylene are comparable to engineering plastics, which further expands the application prospects of reinforced polypropylene. However, due to the large shrinkage rate of the polypropylene material itself and the crystalline material, the cooling and solidification speed after injection molding is slow, and there are positions where the thickness changes in the part, and sink marks are prone to appear. This...

AI Technical Summary

Problems solved by technology

However, due to the large shrinkage rate of the polypropylene material itself and the crystalline material, the cooling and solidification speed after injection molding is slow, and there are positions where the thickness changes in the part, and sink marks are prone to appear. This surface defect seriously affects the appearance of the product. degree, and is still visible after spraying, which greatly limits the use of polypropylene materials in exterior parts

In addition, using the existing ordinary glass fiber reinforced polypropylene production process, the glass fiber will be oriented during the molding process, and warping will occur, so that glass fiber reinforced polyp

Images