Preparation method of poly (butylene succinate) with low cyclic byproduct

Abstract

The invention provides a preparation method of poly (butylene succinate) (PBS) with low cyclic byproducts, which comprises the following steps: adding titanate, succinic acid and 1, 4-butanediol into a reaction kettle for esterification reaction; and adding a solid-loaded tin catalyst and an auxiliary agent crown ether into the reaction kettle, carrying out condensation polymerization to obtain a polymer melt, and granulating to obtain the poly (butylene succinate) polymer. The content of PBS cyclic by-products is less than or equal to 1wt%, and the PBS has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of biodegradable polymer materials, and in particular relates to a preparation method of polybutylene succinate with low cyclic by-products. Background technique [0002] Polybutylene succinate (PBS) and its copolyester is a kind of aliphatic polyester with good biodegradability and comprehensive performance, usually directly esterified with succinic acid and 1,4-butanediol Polycondensation preparation is one of the most promising materials to replace traditional polyolefin plastics. Due to its excellent biodegradability and mechanical properties, PBS has a strong application potential in the field of food contact materials such as disposable lunch boxes and straws. But as we all know, the polyester obtained by dibasic acid and dibasic alcohol reaction will inevitably produce cyclic by-products, and the cyclic by-products in polyester (such as cyclic monomers, dimers, trimers and tetramers) The presence of cyclic mo...

AI Technical Summary

Problems solved by technology

But as we all know, the polyester obtained by dibasic acid and dibasic alcohol reaction will inevitably produce cyclic by-products, and the cyclic by-products in polyester (such as cyclic monomers, dimers, trimers and tetramers) The presence of cyclic monomers) makes PBS unable to meet the requirements of food contact materials, especially cyclic monomers and cyclic dimers undergo more severe migration than corresponding higher oligomers, but the current cyclic by-products of PBS less research

[0003] EP-A2623540 discloses a method for purifying aliphatic polyester such as PBS, wherein the cyclic by-product is removed by solvent extraction, but the disadvantage of this extraction method is that it will cause degradation of polyester, uncontrollable molecular weight, and change in mechanical properties. Difference

[0004] CN111372972 discloses a method for purifying aliphatic polyester in a degassing device. The cyclic by-product is removed by an entrainer. The entrainer is preferably water. This method will also cause degradation of polyester, and the operation is complicated

Images