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Catalyst system for synthesizing aliphatic-aromatic copolyester and application of catalyst system

A catalyst and aromatic technology, used in the field of catalysts for polyester synthesis, can solve the problems of yellowish hue and high molecular weight

Pending Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a catalyst system composed of a titanium-based composition and a metal composition, which can be used for the synthesis of aliphatic-aromatic copolyesters, can increase the polycondensation reaction rate and product molecular weight, and the prepared aliphatic-aromatic The family copolyester product has a high molecular weight, with a weight-average molecular weight (Mw) of 5000-150000g / mol, and reduces the occurrence of side reactions, and solves the disadvantage of yellowish hue of the copolyester product synthesized by traditional single titanium catalyst

Method used

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  • Catalyst system for synthesizing aliphatic-aromatic copolyester and application of catalyst system
  • Catalyst system for synthesizing aliphatic-aromatic copolyester and application of catalyst system

Examples

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Embodiment 1- example 5

[0033] The preparation of embodiment 1-example 5 titanium series composition

example 1

[0035] The molar ratio of titanium compound to hydroxycarboxylic acid is 1:5, the molar ratio of titanium compound to phosphoric acid ester is 1:10, and the molar ratio of titanium compound to 1,4-butanediol is 1:40.

[0036] First weigh 34g (0.2mol) of tetramethyl titanate, 211g (1mol) of citric acid, 280g (2mol) of trimethyl phosphate and 720g (8mol) of 1,4-butanediol and place them in a reactor with a reflux device , stirred and reacted at 50°C for 2 hours, distilled off the small molecules to form an intermediate solution, and cooled to room temperature to prepare the catalyst titanium-based composition C 1-1 .

example 2

[0038] The molar ratio of titanium compound to hydroxycarboxylic acid is 1:0.5, the molar ratio of titanium compound to phosphoric acid ester is 1:0.5, and the molar ratio of titanium compound to 1,4-butanediol is 1:2.

[0039] First weigh 46g (0.2mol) of tetraethyl titanate, 21g (0.1mol) of citric acid, 18g (0.1mol) of triethyl phosphate and 36g (0.4mol) of 1,4-butanediol and place them in a In the reactor, stir and react at 160°C for 1 hour, distill off small molecules to form an intermediate solution, and prepare the catalyst titanium-based composition C after cooling to room temperature 1-2 .

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Abstract

The invention discloses a catalyst system for synthesizing aliphatic-aromatic copolyester and application of the catalyst system. The catalyst system is composed of a titanium composition and a metal composition. The titanium composition is prepared by dissolving a titanium compound, hydroxycarboxylic acid and phosphate in 1, 4-butanediol, heating to react, removing small molecules and cooling to room temperature, and the metal composition is prepared by dissolving titanate, tetraethoxysilane and one metal compound selected from aluminum and zinc compounds in absolute ethyl alcohol, and conducting co-hydrolysis reaction, filtration and vacuum drying, wherein the molar ratio of the titanium composition to the metal composition is 1: 1-1: 10. The method is suitable for preparing copolyester with the aliphatic-aromatic group mole number ratio of 70 / 30-30 / 70, and the molecular weight of the copolyester is 5000-150000 g / mol. The catalyst system is environmentally friendly, side reactions are reduced, and the hue of an aliphatic-aromatic copolyester product is improved.

Description

technical field [0001] The invention relates to the field of catalysts for polyester synthesis, in particular to a catalyst system for the synthesis of aliphatic-aromatic copolyesters and its application. Background technique [0002] Aliphatic-aromatic copolyester is based on the good biodegradability of aliphatic polyester (such as polybutylene succinate, referred to as PBS), combined with aromatic polyester (such as polyterephthalate Butylene glycol formate (abbreviated as PBT) has the characteristics of high melting point, fast crystallization speed and excellent mechanical properties, and is a biodegradable material with good application prospects. A copolymer of aromatic dibasic acid (such as purified terephthalic acid, referred to as PTA) and succinic acid (abbreviated as SA) in fatty acids is used as a reactive monomer to react with 1,4-butanediol. The ester is polybutylene terephthalate-co-succinate (PBST for short); PTA and adipic acid (AA for short), which belong...

Claims

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Application Information

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IPC IPC(8): C08G63/85C08G63/84C08G63/83C08G63/183
CPCC08G63/85C08G63/84C08G63/83C08G63/183
Inventor 臧国强李少山肖刚马国玉米娟韩宝锋
Owner CHINA PETROLEUM & CHEM CORP
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