Thermoshrinking polyester and preparing method thereof

Abstract

Thermoshrinking polyester is disclosed. Raw materials of the thermoshrinking polyester comprise terephthalic acid, ethylene glycol and a modifying agent. The modifying agent comprises 3-8 wt% of a dicarboxylic acid, 5-15 wt% of an aliphatic dihydric alcohol, 0.001-0.003 wt% of a hydrophilicity modifying agent and 0.0001-0.0005 wt% of an antioxidant heat stabilizer, with the amount of the modifying agent being calculated based on the theoretical weight of the polyester. The degree of crystallinity of the polyester is effectively reduced so that thermal degradation and oxidative degradation in subsequent processing steps can be prevented, thus preparing the thermoshrinking polyester with high heat resistance and an antistatic property. The thermoshrinking polyester can be used for high-shrinkage fiber spinning, uniaxial tension high-shrinkage film or other fields needing high-shrinkage polyester. A preparing method of the thermoshrinking polyester is also disclosed.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular, the invention relates to a heat-shrinkable polyester 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 asymmetr...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the shortcoming of low shrinkage rate caused by low shrinkage internal stress due to the high crystallinity of existing ordinary polyester during fiber spinning or uniaxially stretched film. Polyester process production line, providing a high-shrinkage polyester with effectively reduced polyester crystallinity, high heat resistance and antistatic properties and its preparation method

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