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Preparation method and application of high-molecular-weight transparent polyesters

A high molecular weight, polyester technology, applied in the direction of coating, can solve the problems of low molecular weight of polyester, dark polyester color, poor transparency, etc., to achieve excellent mechanical and thermal properties, thermal decomposition temperature increase, mechanical properties boosted effect

Pending Publication Date: 2020-12-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using tetrabutyl titanate as a catalyst, the polyester synthesized by esterification polycondensation method has poor transparency and darker color of polyester, which cannot meet the chromaticity requirements of food-grade bottle-grade polyester, and the resulting The molecular weight of polyester is not high, the tensile properties are not good, and it cannot be processed into ultra-thin films, so it cannot be applied to the field of conductive transparent film components

Method used

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  • Preparation method and application of high-molecular-weight transparent polyesters
  • Preparation method and application of high-molecular-weight transparent polyesters
  • Preparation method and application of high-molecular-weight transparent polyesters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Add 2.989 g (18.2 mmol) of terephthalic acid, 0.316 g (2.1 mmol) of 2,5-furandicarboxylic acid and 2.629 g (18.2 mmol) of 1,8-octane in a 50 mL single-necked flask diol and 0.015 g (0.1 mmol) of trifluoromethanesulfonic acid, and the reaction mixture was reacted at 175 ° C for 4.0 h under nitrogen protection. Then raise the temperature to 220° C., and react for 3.0 h under a pressure environment of 15 KPa to obtain a crude polymer product. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70°C for 3.0 hours to obtain the required high molecular weight polyester 3.295g polyester P 1 , its weight-average molecular weight is 140,000Da, the molecular weight distribution is 1.9, and the yield is 89.98%.

[0033] F...

Embodiment 2

[0043] Example 2: 2.989 g (18.2 mmol) of isophthalic acid, 0.316 g (2.1 mmol) of 2,5-furandicarboxylic acid and 2.629 g (18.2 mmol) of 1,8-octanedicarboxylic acid were sequentially added to a 50 mL single-necked flask alcohol and 0.010 g (0.1 mmol) of sulfamic acid, and the reaction mixture was reacted at 165 ° C for 3.0 h under nitrogen protection. Then raise the temperature to 225° C., and react for 3.0 h under a pressure environment of 15 KPa to obtain a crude polymer product. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70 °C for 3.0 h to obtain 3.452 g of polyester P 2 , its weight average molecular weight is 140,328Da, the molecular weight distribution is 2.3, and the yield is 90.05%.

[0044] Polyester P 2 High mo...

Embodiment 3

[0046] Example 3: Add 0.332 g (2.1 mmol) of isophthalic acid, 2.54 g (18.2 mmol) of 2,5-furandicarboxylic acid and 0.292 g (2.1 mmol) of 1,8-octane in a 50 mL single-necked flask diol and 0.018 g (0.1 mmol) of p-fluorobenzenesulfonic acid, and the reaction mixture was reacted at 170 ° C for 4.0 h under nitrogen protection. Then raise the temperature to 230° C., and react for 3.0 h under a pressure environment of 15 KPa. After cooling the crude polymer product, add a certain amount of chloroform, shake to promote dissolution, add methanol to the filtrate after filtration, until the resulting precipitate no longer increases. The filter residue obtained after filtration was washed with methanol, and then vacuum-dried at 70 °C for 3.0 h to obtain 3.232 g of polyester P 3 , its weight-average molecular weight is 150,000Da, the molecular weight distribution is 3.0, and the yield is 89.95%.

[0047] Polyester P 3 High molecular weight and transparent, it can be used as the main co...

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Abstract

The invention discloses a preparation method and application of novel high-molecular-weight transparent polyesters, and belongs to the field of polyester synthesis. Terephthalic acid or isophthalic acid, 2,5-furandicarboxylic acid and dihydric alcohol or other dihydroxy compounds are used as raw materials, and a series of novel polyesters with high molecular weight are synthesized by adopting a melt polymerization method. The method provided by the invention has the advantages of small catalyst usage amount, efficient reaction and high transparency of the obtained polyesters, and the synthesized polyester has the characteristics of high molecular weight, wide molecular weight distribution, good thermal properties, excellent mechanical properties and the like, and is easy for hot processingtreatment in the next step. The transparent high-molecular-weight polyester prepared by the preparation method can be used as a main component for processing a bottle-grade polyester material, and can also be used as a substrate raw material of a transparent conductive polyester film material.

Description

technical field [0001] The invention belongs to the field of chemistry and relates to the preparation and application of a novel polyester. It specifically involves using terephthalic acid or isophthalic acid, 2,5-furandicarboxylic acid and dihydroxy compounds as raw materials to prepare a high-molecular-weight transparent polyester through a two-step reaction of catalyzed esterification exchange reaction and catalyzed polycondensation. It can be used as the main component material of transparent polyester bottles in the food and beverage industry, and can also be used as the main raw material of transparent conductive films, belonging to the field of polymer synthesis and application. Background technique [0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polybasic acids. It is a class of polymer materials with excellent performance and a wide range of uses. It can be made into polyester fibers, polyester films and polyester bottle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C08G63/82C08L67/02C08L91/00C08K5/11C08K5/098C08K5/12C08J7/06C08J5/18
CPCC08G63/672C08G63/78C08G63/82C08K5/11C08K5/12C08K5/098C08L67/02C08J7/06C08J5/18C08L2201/10C08J2367/02C08L91/00
Inventor 程正载熊景周佳丽申露萍周淑雯李贝贝李光要马里奥
Owner WUHAN UNIV OF SCI & TECH
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