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Ring opening polymerization method of PBAT/PLA (poly(butylene adipate-co-terephthalate)/poly(lactic acid)) block copolymer

A block copolymer and ring-opening polymerization technology, applied in the field of biodegradable materials, can solve the problems of low weight average molecular weight and low yield, and achieve the effect of high weight average molecular weight and high yield

Inactive Publication Date: 2017-09-15
HENAN GREEN POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, block copolymers are prepared by direct ring-opening polymerization of lactide and PBAT under the action of a catalyst, and the weight-average molecular weight is not high and the yield is low

Method used

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  • Ring opening polymerization method of PBAT/PLA (poly(butylene adipate-co-terephthalate)/poly(lactic acid)) block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 146g of adipic acid, 194g of dimethyl terephthalate, and 216g of 1,4-butanediol into the reaction kettle, protect it with nitrogen, and heat it to 140°C. After the materials in the reaction kettle are completely melted, add tetrabutyl titanate Esters 5.56mg. Vacuumize to 0.06Mpa, react for 2h, then gradually increase the temperature to 230°C within 1h, control the vacuum degree at 1000Pa, continue to react for 5h, and obtain the prepolymer PBAT. Afterwards, 5.8 g of ethylene glycol was added for direct polycondensation reaction, and the vacuum degree was controlled at 1000 Pa. After 0.1 h of reaction, the material was discharged to obtain PBAT with hydroxyl groups at both ends, and the weight-average molecular weight was 60,000.

[0029] 60 g of PBAT with hydroxyl groups at both ends and 60 g of L-lactide were put into the reactor. The temperature is controlled at 160°C. After the material in the kettle is completely melted, 6 mg of stannous octoate is added, and t...

Embodiment 2

[0031] Put 146g of adipic acid, 97g of dimethyl terephthalate, and 135g of 1,4-butanediol into the reaction kettle, protect it with nitrogen, and heat it to 160°C. After the materials in the reaction kettle are completely melted, add tetra-titanate Butyl ester 37.8 mg. Vacuumize to 0.02Mpa, react for 2h, then gradually increase the temperature to 220°C within 2h, control the vacuum degree at 500Pa, and continue to react for 4h. The prepolymer PBAT was obtained, and then 4.5 g of hexanediol was added to carry out direct polycondensation reaction. The vacuum degree was controlled at 5 Pa. After 2 hours of reaction, the material was discharged to obtain PBAT with hydroxyl groups at both ends, and the weight average molecular weight was 100,000.

[0032] 60 g of PBAT with hydroxyl groups at both ends and 60 g of L-lactide were put into the reactor. The temperature is controlled at 200°C. After the material in the kettle is completely melted, 60 mg of stannous octoate is added, an...

Embodiment 3

[0034] Put 73g of adipic acid, 194g of dimethyl terephthalate, and 135g of 1,4-butanediol into the reaction kettle, protect it with nitrogen, and heat it to 150°C. After the materials in the reaction kettle are completely melted, add tetratitanate Butyl ester 2.01 g. Vacuumize to 0.04Mpa, react for 2h, then gradually increase the temperature to 210°C within 1h, control the vacuum degree at 800Pa, and continue to react for 1h. The prepolymer PBAT was obtained, and then 4.3 g of diethylene glycol was added to carry out direct polycondensation reaction. The vacuum degree was controlled at 2000 Pa. After 1 hour of reaction, the PBAT with hydroxyl groups at both ends was obtained, and the weight average molecular weight was 10000.

[0035] 60 g of PBAT with hydroxyl groups at both ends and 60 g of L-lactide were put into the reactor. The temperature is controlled at 120°C. After the material in the kettle is completely melted, 30 mg of stannous octoate is added, and the vacuum deg...

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Abstract

The invention provides a ring opening polymerization method of a PBAT / PLA (poly(butylene adipate-co-terephthalate) / poly(lactic acid)) block copolymer, which includes steps of feeding aliphatic diol in a reaction kettle with a prepolymer PBAT; preparing PBAT of which both ends have hydroxyls; feeding the PBAT of which both ends have hydroxyls and lactide into a reaction kettle; after materials in the kettle are completely melted, adding catalyst B for reaction to obtain PBAT-PLA block copolymer. The ring opening polymerization method of the PBAT / PLA has high output of block copolymer.

Description

technical field [0001] The invention relates to the technical field of biodegradable materials, in particular to a ring-opening polymerization method of a PBAT-PLA block copolymer. Background technique [0002] Polylactic acid combines resource renewability, complete biodegradability, biocompatibility, processability, and transparency. It is known as the most promising biochemical synthetic polymer new green environmental protection material in this century. However, polylactic acid has the disadvantages of low elongation at break, poor impact strength, poor toughness, lack of elasticity and flexibility, and it is difficult to meet some practical requirements, which limits its application. Therefore, polylactic acid needs to be toughened and modified. Traditional methods include physical modification and chemical modification. For example, the PBAT-PLA blend prepared by the direct blending process of PBAT and polylactic acid. In the prior art, block copolymers are prepared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/78C08G63/83C08G63/85
CPCC08G63/08C08G63/78C08G63/823
Inventor 阮刘文李万鑫汤永彬何新宇杨文军冒彬
Owner HENAN GREEN POLYMER CO LTD
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