PBT/ABS alloy material and method for preparing same

Abstract

The invention discloses a PBT / ABS alloy material and a method for manufacturing an automobile bumper. The compositions by weight percentage of the PBT / ABS alloy material are: 45 to 70 percent of PBT, 20 to 45 percent of ABS, 1 to 10 percent of active compatibilizer, 0.1 to 0.6 percent of lubricant, 0.1 to 1.2 percent of chemical inhibitor and 0.1 to 0.6 percent of light stabilizer. The PBT / ABS alloy material has high surface activity, excellent low temperature toughness, excellent dimension stability and high thermal distortion temperature, and other indexes all reaching or exceeding the prior automobile material standards. The bumper molded by the material has high surface activity and strong bonding force with oil paint, can undergo direct spray painting without flame treating, have high thermal distortion temperature and stable dimension, can not cause obvious distortion due to vast-scale variance of the temperature, have smooth and bright surface, good spray painting effect and short baking time, and improve the production efficiency. Moreover, the material can be directly dyed into the same color with a metal part according to the appearance demand of the part, thereby the spray painting technique is saved and the spray painting free effect is achieved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a PBT / ABS alloy material and a preparation method thereof. Background technique [0002] Polybutylene terephthalate (PBT) is a relatively new type of thermoplastic engineering plastic developed and industrialized by Celanese Corporation of the United States in the 1970s. It has fast crystallization speed, excellent electrical properties and changes with temperature and humidity. Small; good weather resistance, suitable for outdoor use, and excellent chemical resistance; outstanding electrical properties, is an ideal material for electronics and electrical industries, widely used in electronics, electrical, automobiles, household appliances, electric tools, sports equipment, etc. It is also one of the fastest growing engineering plastics in the last decade. [0003] At present, both foreign and domestic bumper materials are mainly composite materials of polypropylene pl...

AI Technical Summary

Problems solved by technology

[0003] At present, both foreign and domestic bumper materials are mainly composite materials of polypropylene plus elastomer and minerals. Although they meet the current automotive material standards, there are many functional deficiencies in subsequent processing, which need to be compensated by increasing processes. Not only Increased processing and logistics costs, and the increase of defective products in the process of processing, the typical problems are:

Flame treatment is a key procedure in the current polypropylene bumper coating process. Under normal production conditions, its product rate is about 3% of the total amount of the bumper system. However, if the flame process is not handled properly, the The entire batch of painted bumpers will be scrapped, which will cause huge losses

[0005] The current bumper of polypropylene base material has low heat resistance, high coefficient of thermal expansion, and large size change before and after treatment, which causes the size of the bumper to change due to temperature changes during use, resulting in deformation of the bumper and internal damage. Stress, easy to cause loosening or damage of the bumper

[0006] The bumper must go through two baking processes during the painting process. The heat resistance of the current bumper material is not high enough. In order to ensure that the bumper does not deform during the baking process and the paint is completely cured, the baking temperature is generally set Around 80 degrees, the safe painting process takes 3-3.5 hours, and the production efficiency is very low

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