Ultrahigh heat-resistant polyester alloy for vehicle lamp and preparation method thereof

Abstract

The invention provides an ultrahigh heat-resistant polyester alloy for a vehicle lamp, which comprises the following components in part by weight: 30 to 40 parts of PET nucleating agent blend, 30 to 50 parts of PBT, 0.5 to 0.8 parts of antioxidant, 0.6 to 1.2 parts of chain extender, 1 to 1.5 parts of dispersing aid, 10 to 20 parts of montmorillonoid, 0.5 to 0.9 part of silicone powder, 10 to 15 parts of talcpowder treated by coupling agent, 0.8 to 2 parts of antimonite and 0.8 to 2 parts of sodium dihydrogen phosphate. The polyester alloy of the invention keeps good workability, low temperature resistance, weather resistance and chemical resistance of thermoplastic polyester, improves the crystallinity and shaping workability of PET, has excellent heat resistance (the thermal deformation temperature under 0.46Mpa reaches 222 DEG C) and good size stability, can replace the traditional BMC manufactured reflection component, and realizes integration of a reflector of a head lamp and a lamp body.

Description

technical field [0001] The invention relates to a polyester alloy and a preparation method thereof, in particular to a very high heat-resistant polyester alloy for vehicle lamps and a preparation method thereof. Background technique [0002] Car lights are composed of lamp holders, lamp bodies, reflectors, decorative rings and light distribution mirrors. Generally speaking, car lights are divided into lighting lights and signal lights. The former includes headlights, fog lights, reversing lights, etc., and the latter includes Turn signals, marker lights, tail lights, etc. Car lights of different shapes and different functions have different requirements for the material of the car lights. The lighting power of the headlights and fog lights is the highest, which is almost three times that of other car lights, or even higher. Therefore, these two car lights The material should have high heat resistance, and the reflector, which is the most heated plastic part in the lamp, als...

AI Technical Summary

Problems solved by technology

[0003] The materials used for traditional car lights include: PP filling, heat-resistant ABS, PC / ABS, PC, etc. The heat-resistant temperature generally does not exceed 120 degrees, but there are many types of car lights that cause short-term temperatures exceeding 120 degrees due to frequent use, resulting in lamps Body deformation, affecting the safe use of lights

In terms of reflectors, the processing of BMC materials is extremely complicated, and the scrap rate is high, and the price of heat-resistant PC, PPS, PEI and other resins is too high, which does not meet the development of new car lights