Preparation method of shrinkage-free copolyester film

• Main Authors: HE CHANJUAN, TANG RONGZHI, JIANG CHUNHUI, LUO CHUNMING
• Format: Patent
• Language: Chinese; English
• Published: 02.04.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention discloses a preparation method of a shrinkage-free copolyester film, which is characterized by comprising the following steps of: synthesizing hepta-spiro phthalic acid or nine-spiro phthalic acid by adopting a spiro benzene compound, adding hepta-spiro phthalic acid or nine-spiro phthalic acid, terephthalic acid, ethylene glycol and the like into a reaction kettle, carrying out esterification reaction, adding a catalyst and a stabilizer, and carrying out polycondensation reaction to obtain the shrinkage-free copolyester film. Finally, the shrinkage-free copolyester film is prepared by adopting a two-way stretching process. By adopting the non-shrinkage copolyester film and the preparation method thereof, the defect that in the prior art, the shrinkage rate of a PET film is large due to the longitudinal tension problem can be overcome, and the prepared non-shrinkage copolyester film has the advantages of being relatively simple to synthesize, high in mechanical strength, completely free of shrin