A special material composition for automobile rear wing with low metal adhesion

Abstract

The invention relates to a special material composition with low metal cohesiveness for automobile tail fins. The material composition comprises the following components in parts by weight: 89-98 parts of acrylonitrile butadiene styrene (ABS) matrix with high melt strength, 1-3 parts of a fluorine-containing polymer and 2-8 parts of calcium carbonate, wherein the ABS matrix with high melt strength is a mixture of an acrylonitrile-butadiene-styrene copolymer, a styrene-maleic anhydride copolymer and an acrylonitrile-styrene-glyceryl methacrylate copolymer, and the calcium carbonate is calcite nanometer calcium carbonate of which the grain size is 20-200nm. The adhesive property of the material on metal is reduced by a special design of the formula, the problems of coke materials, black spots, surface scratches, long cleaning time and the like generated in the extruding and blow molding processes are greatly solved, and meanwhile, the material also has the characteristics of high melt strength, good dimensional stability, high heat resistance, good workability and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a special material composition for automobile tail fins with low metal adhesion. Background technique [0002] With the rapid development of the automobile industry, the domestic and foreign demand for blow molding materials for automobile rear fins has risen sharply. The automotive industry usually requires that the car tail can be placed in an environment of 95-105°C for 24-168 hours without deformation. The car tail obtained by blow molding with ordinary ABS cannot meet this high heat resistance requirement. If heat-resistant ABS is used for blow molding, on the one hand, it is difficult to plasticize the heat-resistant monomer with a high glass transition temperature in the material; Poor molding. [0003] At present, there are also related reports on blow-molding grade heat-resistant ABS in China. Most of the reports have improved the rigidity, surface appearance...

AI Technical Summary

Problems solved by technology

It has been proposed in the literature to increase the rubber content to improve the impact resistance of ABS resins. However, due to the high linear expansion coefficient of rubber, the resulting resin composition has poor dimensional stability.

U.S. Patent Nos. 4,430,478, 5,605,963 and 5,696,204 propose that the polymer particles produced in the emulsion polymerization process are mixed with the polymer particles produced in the bulk polymerization process to improve the impact strength of the material, but the melt strength of the material obtained by this method is relatively low. Low, poor blow molding performance

There are also literatures that add high-molecular-weight acrylate processing aids to improve melt strength. However, the compatibility between acrylate processing aids and the matrix is ​​poor, and the linear expansion coefficients of the two are quite different, which is prone to uneven surface defects. Phenomenon

Chinese patent CN102617983B proposes a method for improving melt strength by cross-linking reaction between styrene-maleic anhydride copolymer and acrylonitrile-styrene-glycidyl methacrylate copolymer to obtain a cross-linked network structure. The obtained material has high melt strength, high heat resistance, and high dimensional stability, but due to the addition of more polymers containing active functional groups of maleic anhydride and glycidyl methacrylate, the polarity is very high, It is easy to bond on the surface of the metal screw and the surface of the die of the extruder, resulting in excessive retention time of the material, causing problems such as burnt material, black spots, surface scratches and long cleaning time

[0004] Based on the above technical problems, there is an urgent need for a special material for automobile tail fins with low metal adhesion to solve the problems of coke, black spots, surface scratches, and long cleaning time. At the same time, it should have high melt strength and balanced properties. Longitudinal and transverse extensibility, good dimensional stability, high heat resistance and other advantages make the automobile rear spoiler obtained by blow molding not only have excellent appearance, but also meet the high heat resistance requirements of automobile products