Preparation method of high crystallization thermoplastics type polybutylene terephthalate slice

Abstract

The invention relates to a preparation method of a high crystallization thermoplastics type polybutylene terephthalate slice, comprising the following steps of firstly, preparing 1 percent of tetrabutyl titanate catalyst solution and 1 percent of nanometer titania solution, and mixing the tetrabutyl titanate catalyst solution and the nanometer titania solution by two metering pumps and a static mixer to be used as a composite catalyst; secondly, mixing talcum powder and 1, 4 butanediol, and preparing 1 percent of talcum powder solution by stirring the talcum powder and the 1, 4 butanediol; thirdly, mixing cobalt acetate and the 1, 4 butanediol and preparing 1 percent of cobalt acetate solution by stirring the cobalt acetate and the 1, 4 butanediol; and fourthly, adding purified terephthalic acid and the 1, 4 butanediol into a slurry preparation groove to stir, sending the mixture into an esterfication reactor, adding the talcum powder solution, the cobalt acetate solution and the composite catalyst solution into the esterfication reactor to react to obtain ester, inputting the ester into a prepolycondensation reactor, inputting a product into a finishing reactor, and obtaining a crystallization slice by cutting a product casting band after final polycondensation into particles. The prepared polybutylene terephthalate slice can rapidly carry out high crystallization in the processes of backend processing injection, extrusion, blow molding and coating.

Description

(1) Technical field [0001] The invention relates to a polybutylene terephthalate (PBT resin) slice and a preparation method thereof. (2) Background technology [0002] Because of its high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, weather resistance, and low water absorption, PBT resin is only 1000PPM, and it can still maintain various physical properties (including electrical properties) in a humid environment. Resistance to hot water, alkali, acidity, oil, crystallization performance at low temperature is better than PET, and has good formability. In recent years, it has been widely used in the fields of automobiles, electronic appliances, optical sheaths, industrial machinery and polymer alloys. [0003] The production process of PBT polyester chips is as follows: purified terephthalic acid and 1,4 butanediol are added and stirred in the slurry configuration tank according to the set molar ratio, and the prepared slurry is...

AI Technical Summary

Problems solved by technology

[0004] In the subsequent processing process, conventional PBT polyester chips have disadvantages such as slow crystallization and prolonged production cycle in the process of making and forming, which significantly restricts the direct production cost and production capacity of billet making and forming processes. Therefore, In order to solve this problem, a certain amount of talc powder particles can be added to the PBT melt, but the addition of a certain amount of talc powder has adverse effects on the appearance quality of the plastic while increasing the crystallization speed, and the color is poor. If you simply reduce If the amount added, it will reduce the crystallization speed of PBT, and then the crystallinity will become lower.

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