Polyester material, thermal shrinkage film and preparation method and application thereof

By using a specific combination of dicarboxylic acids, diols, chain extenders, and stabilizers, the composition and structure of PETG heat shrink film are controlled, solving the problems of high initial shrinkage temperature and insufficient transparency of PETG heat shrink film. This achieves high shrinkage rate and high transparency at low temperatures, making it suitable for packaging high-end products.

CN122080375APending Publication Date: 2026-05-26JIANGMEN PEIZHEN TECH CO LTD
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Patent Information

Application Number
CN202610241528.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-28
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing PETG heat shrink film has a high initial shrinkage temperature, poor low-temperature shrinkage performance, and difficulty in balancing haze and strength. The room for optimization of transparency and shrinkage rate is also limited.

Method used

By using a specific ratio of dicarboxylic acid, diol, chain extender, stabilizer, and catalyst, and by rationally controlling the amount of chain extender added and selecting 1,4-cyclohexanediethanol and diethylene glycol, the ratio of polyterephthalic acid to isophthalic acid is regulated, the chain growth process and molecular weight distribution are optimized, the formation of amorphous structures is promoted, and the crystallinity of the material is reduced.

Benefits of technology

It achieves low initial shrinkage temperature, high shrinkage rate and high transparency, while maintaining the strength of the material, making it suitable for packaging of high-end products.

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Abstract

The invention discloses a polyester material, a heat shrink film and a preparation method and application thereof. The polyester material is prepared from dibasic acid, dihydric alcohol, a chain extender, a stabilizer and a catalyst. Wherein the binary acid is prepared from 90 mol%-95 mol% of poly (terephthalic acid) and 5 mol%-10 mol% of isophthalic acid; the dihydric alcohol is prepared from 65 mol% to 78 mol% of ethylene glycol, 18 mol% to 28 mol% of 1, 4-cyclohexanedimethanol and 4 mol% to 12 mol% of diethylene glycol; the chain extender is 2, 2 '-(1, 3-phenylene)-dioxazoline, and the addition amount of the chain extender is 0.2%-0.8% of the total mass of the dihydric alcohol and the binary acid; the molar ratio of carboxyl / hydroxyl in the dibasic acid to the dihydric alcohol is 1: (1-1.05). The polyester material disclosed by the invention has excellent transparency, shrinkage rate and strength, is low in initial shrinkage temperature, and is particularly suitable for the fields of thermal shrinkage films and the like. The invention also provides a heat shrink film, a polyester material, and a preparation method and application of the heat shrink film.
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