Polyester for heat shrinkable film and preparation method thereof

Abstract

The invention belongs to the field of high polymer materials, and particularly relates to polyester for a heat shrinkable film and a preparation method of the polyester, and the polyester for the heat shrinkable film comprises dicarboxylic acid, aliphatic diol, a hydrophilic modifier, an antioxidant heat stabilizer, terephthalic acid and ethylene glycol or terephthalic acid derivatives and ethylene glycol. The preparation method comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol, dicarboxylic acid, aliphatic diol and a titanium catalyst, inputting into a first reactor, and carrying out esterification reaction to generate an ester; mixing a hydrophilic modifier, an antioxidant heat stabilizer, an antimony catalyst and the ester, and performing esterification and pre-polycondensation to obtain a prepolymer; and carrying out condensation polymerization on the prepolymer to obtain the heat-shrinkable polyester. The heat-shrinkable polyester prepared by adopting a continuous polyester process production line effectively reduces the crystallinity of the polyester, has the advantages of high heat resistance, antistatic property, high shrinkage rate, high degradation resistance, high transparency and the like, and is simple and easy to control, low in equipment requirement, energy-saving and emission-reducing, and good in prospect.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a polyester used for heat-shrinkable films and a preparation method thereof. Background technique [0002] PET polyester is a crystalline polymer, and the thermal shrinkage rate of fibers obtained by spinning or uniaxially stretched film is relatively low in the later stage. Even after special processing, only a thermal shrinkage rate of less than 30% can be obtained. In order to prepare fibers or films with high shrinkage rate, ordinary polyester needs to be modified by copolymerization. After copolymerization, the thermal shrinkage rate of fibers can reach more than 50%, and the highest thermal shrinkage rate of films can reach more than 70%. Copolymerization modification is mainly to add the third component or even the fourth component to participate in the copolymerization, change the regularity of the polyester chain segment, and make it produce an asymmet...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a polyester for heat-shrinkable film, which can effectively reduce the crystallinity of polyester by adopting the existing continuous polyester production line, and overcome the high Crystallinity, the shortcoming of low shrinkage rate due to low shrinkage internal stress, has the advantages of high heat resistance, antistatic property, high shrinkage rate, high resistance to degradation and high transparency, and the preparation method is simple and easy to control, and the equipment Low process requirements, energy saving and emission reduction, good application prospects

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