Highlight polypropylene material capable of improving color change of weld line

Abstract

The invention provides a highlight polypropylene material capable of improving the color change of a weld line. The highlight polypropylene material is prepared from the following ingredients in percentage by weight: 24 to 88 percent of polypropylene A, 10 to 25 percent of polypropylene B, 1 to 10 percent of polybutylene-1, 0 to 20 percent of filling materials, 0.2 to 2 percent of lubricating agents, 0.2 to 16 percent of dispersing agents, 0.1 to 1 percent of nucleating agents and 0.1 to 2 percent of other auxiliary agents, wherein the polypropylene B is random copolymerization polypropylene. Through the addition of the random copolymerization polypropylene with higher flowability than substrate polypropylene, the molecular weight distribution width of the polypropylene is expanded; the interpenetration and the winding and knotting of molecular chains during the feeding flow front end welding can be promoted; a better weld position effect is achieved; the glossiness of the materials can be enhanced. In addition, the high-flowability polybutylene-1 has good compatibility and fusion dispersion performance with the polypropylene; the melting point is lower; the linear molecules are favorable for the penetration and insertion in substrate resin; the lubrication and the dispersion of inorganic particles in the welding process are facilitated; the formation of color change strips or carving marks formed by inorganic particle accumulation can be effectively avoided.

Description

technical field [0001] The invention relates to a high-gloss polypropylene material, in particular to a high-gloss polypropylene material which can improve the discoloration of welding lines. Background technique [0002] High-gloss polypropylene materials are widely used in existing household appliances. When high-gloss polypropylene is injected, when there are multiple gates, or when there are inserts or holes in the cavity of the injection mold, or the wall thickness of the part changes significantly, generally There will be obviously two streams; when the two streams meet, the cold front permafrost at the front of each stream meets, melts, and then freezes again to form a weld line; after they meet, the inorganic pigment particles are in this complex During the phase transition process, it separates and accumulates with the matrix resin, resulting in streaks or scratches that may appear discolored; with the improvement of people's pursuit of quality of life, it becomes m...

AI Technical Summary

Problems solved by technology

The high toughness and high gloss polypropylene composite also fails to solve the technical problem of discolored streaks or nicks at the weld, so further improvements are necessary

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