High-flowability high-glossiness no-surface-defect colored metallic-pearl-effect spraying-free polypropylene automobile material and preparation method thereof

Abstract

The invention discloses a high-flowability high-glossiness no-surface-defect colored metallic-pearl-effect spraying-free polypropylene automobile material and a preparation method thereof. The material is composed of the following components in percentage by weight: 40.8-74.4% of polypropylene, 2-4% of toughener, 5-20% of mineral master batch, 5-10% of compatilizer, 0.4-0.6% of antioxidant, 0.4-0.6% of light stabilizer, 0.8-2% of lubricant, 6-10% of surface modifier, 3-6% of colored metallic pigment master batch and 3-6% of pearl color master batch. By using the high-melt-flow-rate polypropylene resin, compatilizer, surface modifier, mineral master batch, colored metallic pigment master batch and pearl color master batch, all the components can be uniformly dispersed, so that the material has the advantages of favorable glossiness, favorable pearl effect, favorable metallic sensation and no surface defect, and the appearance effect is infinitely approximate to the painting effect. The material can solve the problem of surface flow mark, tiger skin or fusion wire in the thin-wall complex-structure large-size product without especially customizing the ultrahigh-glossiness mirror surface mold or harsh injection molding technique, and can implement direct color-bearing injection molding of the part.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and relates to a high-fluidity, high-gloss, non-surface-defect colored metal pearlescent effect spray-free polypropylene automotive material and a preparation method thereof. Background technique [0002] In recent years, the automobile industry has developed rapidly, especially the output and social ownership of cars have maintained a relatively high growth rate. Plastics for automobiles play an irreplaceable role in satisfying aesthetics, safety, and lightweight. At the same time, new technologies for automobiles are also It is developing towards a more environmentally friendly, safer, more comfortable and personalized direction. Among the varieties of plastics used in automobiles, modified polypropylene materials have become the most used variety in plastic materials used in automobiles, and are also the focus of the development and application of plastics used in automobiles. Polypr...

AI Technical Summary

Problems solved by technology

This patent only invented a polypropylene composition with paint luster and metallic texture, which does not have high flow and colorful pearl effect, and will be severely limited in practical application.

[0005] The disadvantage of this patented formula is that no compatibilizer, lubricating dispersant, or antioxidant is used in its formula system

This patent only invented a spray-free PP material, but in solving the problems of product weld lines and flow marks, it needs to cooperate with high-gloss mirror molds and higher mold temperature molding conditions, which have strict restrictions on molds and molding conditions. In practical applications will be severely restricted

[0007] The disadvantage of this patented formula is that it does not use high melt flow rate PP and compatibilizer in its formula system, and the melt flow rate in its formula system is 9-11g / 10min, belonging to the range of low melt flow rate, will affect the uniform plasticization among the components, which will have a great impact on high gloss and appearance; not using compatibilizers will affect the effect pigments in the formula system Compatibility with polypropylene, which will have a greater impact on the metal or pearlescent effect. In summary, the surface gloss, metallic or pearlescent effect and appearance of the PP material are far behind the spray paint effect

Although this patent invented a spray-free modified polypropylene material, the spherical or rod-shaped metal powder added in its formula cannot solve the problem of tiger skin pattern in the injection molding process, and it will also be seriously affected in practical application. limit

[0009]The disadvantage of this patented formulation is that it does not use flake structure metal powder, high melt flow rate polypropylene and compatibilizer in its formulation system

According to the principle of light reflection, when light is incident on a rod-shaped or spherical surface and there is a large amount of refraction or diffuse reflection, total reflection cannot be achieved, which will have a greater impact on the gloss of the paint and the silver metallic texture

Moreover, the melt flow rate in the patented formula system is 20-40g / 10min, which belongs to the low-medium melt flow rate range, which will affect the uniform plasticization between the components, thereby affecting the high gloss and appearance; no compatibilizer is used It will affect the compatibility of the effect pigments in the formula system with polypropylene, which will have a great impact on the gloss and silver metallic texture of the paint. Its application range will be severely limited, so there are defects and need further improvement

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