PC/ABS alloy resistant to damp-heat aging and preparation method thereof

Abstract

The invention relates to a PC / ABS alloy resistant to damp-heat aging and a preparation method of the PC / ABS alloy. The alloy comprises the following components in parts by weight: 50-80 parts of PC resin, 20-45 parts of ABS resin, 5-10 parts of cement, 0.1-2 parts of an antioxidant and 0.1-2 parts of a lubricant. The preparation method comprises the following steps: uniformly mixing the PC resin,the ABS resin, the cement, the antioxidant and the lubricant in parts by weight in a high-speed mixer, adding the uniformly mixed materials into a double-screw extruder, carrying out melt blending extrusion, and finally, carrying out underwater granulation and drying to obtain the PC / ABS alloy. Compared with the prior art, the hydrolysis resistance of the material can be improved without adding ahydrolysis-resistant agent, so that the damp-heat aging performance of the resin is improved, the thermal expansion coefficient of the system can be reduced, and an obvious effect of improving the dimensional stability of high-precision parts is achieved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a PC / ABS alloy resistant to damp heat aging and a preparation method thereof. Background technique [0002] PC / ABS alloy has excellent mechanical and thermal properties, and is widely used in automobiles, home appliances, digital products and other fields. [0003] However, as consumers have higher and higher requirements for automobile safety, the requirements for automobile materials are also becoming more and more stringent. The thermal aging performance of materials has become a rigid indicator of material safety. At present, many automobile manufacturers regard the physical property retention rate of materials after damp heat aging (85°C, 85RH%) as one of the detection indicators of material performance. Since the PC resin contains ester groups, and the ester groups are easily hydrolyzed under high temperature and high humidity, resulting in deterioration of material proper...

AI Technical Summary

Problems solved by technology

Because PC resin contains ester groups, and ester groups are easily hydrolyzed under high temperature and high humidity, resulting in deterioration of material properties, resulting in low moisture and heat aging resistance of existing PC / ABS alloys

[0004] In the prior art, the improvement of the anti-moisture and heat aging performance is generally achieved by adding organic anti-hydrolysis agents such as carbodiimide or anti-hydrolysis polyethylene terephthalate, but these organic hydrolysis-resistant agents such as carbodiimide show Strong alkaline, will cause material degradation, not suitable for PC / ABS system

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