Glass fiber reinforced PA6 composite material and preparation method and application thereof

Abstract

The invention relates to a glass fiber reinforced PA6 composite material and a preparation method and application thereof. The PA6 composite material comprises the following components in parts by mass: 20-60 parts of PA6; 10-40 parts of polypropylene; 0.1-3 parts of a high-temperature nylon nucleating agent; 0.1-1 part of a lubricant; 3-5 parts of a compatible toughening agent; 0.5-2 parts of an antioxidant; 30-50 parts of glass fiber; 5-15 parts of a mineral filler; and 0.5-2 parts of blackening master batch. The preparation method of the PA6 composite material comprises the following steps: mixing the PA6, the polypropylene, the high-temperature nylon nucleating agent, the lubricant, the compatible flexibilizer, the antioxidant, the mineral filler and the blackening master batch to obtain a first mixed material; the first mixed material and glass fibers are subjected to melt mixing, extrusion and grain-sized dicing, and the PA6 composite material is obtained. According to the PA6 composite material, the crystallinity and salt fog resistance of PA6 can be remarkably improved, the water absorption rate of the PA6 composite material is reduced, and the size of the finished product made of the PA6 composite material is more stable.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a glass fiber reinforced PA6 composite material and its preparation method and application. Background technique [0002] The amide group of nylon PA6 engineering plastic resin is a polar group, and the molecular arrangement is regular, so PA6 has a high degree of crystallinity. The molecular chains of PA6 are arranged antiparallel, and the intermolecular hydrogen bond force is strong, forming the α crystal form; the molecular chains are arranged in the same direction, and the hydrogen bond force is weak, forming the γ crystal form. Therefore, PA6 has excellent barrier properties, solvent resistance and mechanical properties, etc., but because the amide group is a polar group with strong hydrophilicity, PA6 is easy to absorb water, and it is easy to absorb water in later applications, resulting in product size deviation. [0003] The amide group in PA6 has a certain ...

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Problems solved by technology

[0005] Technical problem to be solved: In view of the shortcomings of existing glass fiber reinforced PA6 composite materials such as high water absorption, poor salt spray resistance, warpage and long injection molding cycle, the present invention provides a glass fiber reinforced PA6 composite material and its preparation Method and application, on the basis of adding a nucleating agent, the composite material can significantly improve the crystallinity, crystallinity and Salt spray resistance, lower water absorption, and more stable dimensions of finished parts

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