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Method for synthesis of polylactide polyol by lactide and polyol

A polylactide and polyol technology is applied in the field of polylactide polyol to achieve the effects of ensuring stability, improving conversion rate and reducing losses

Inactive Publication Date: 2013-11-20
SHENZHEN ESUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All published patents do not use lactide and polyols as raw materials to produce polylactide polyols by ring-opening polymerization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] The crude lactide is purified first. The purified lactide requires that the lactide content is above 99.5%, the light purity is above 99.0%, and the water content is below 1000ppm. Add 122.0g of purified lactide that meets the requirements into a 500ml three-necked flask, and then add Reagent grade 1,4-butanediol 200.0g, then add stannous octoate catalyst with a lactide mass of 0.5 / 1000, vacuumize for nitrogen replacement, and raise the temperature to 140°C under nitrogen protection conditions. The temperature was raised to 170°C for 3 hours. After the reaction, a polylactide polyol with a viscosity average molecular weight of 100.2 was obtained.

example 2

[0024] The crude lactide is purified first. The purified lactide requires that the lactide content is above 99.5%, the light purity is above 99.0%, and the water content is below 1000ppm. Add 232.2g of lactide that meets the requirements after purification into a 500ml three-necked flask, and then add Reagent grade ethylene glycol 100.0g, then add stannous lactate catalyst with a lactide mass of 0.5 / 1000, vacuumize for nitrogen replacement, raise the temperature to 140°C under nitrogen protection, and react at 140°C for 1 hour, Raise the temperature to 170°C for 3h. A polylactide polyol having a viscosity average molecular weight of 302.0 was obtained.

example 3

[0026] The crude lactide is purified first. The purified lactide requires that the lactide content is above 99.5%, the light purity is above 99.0%, and the water content is below 1000ppm. Add 227.1g of purified lactide that meets the requirements into a 500ml three-necked flask, and then add Reagent grade neopentyl glycol 50.0g, then add a catalyst with a lactide mass of 0.5 / 1000, the catalyst is a mixture of diethyl zinc, tin lactate, and tin oxide in a weight ratio of 1:1:1, and then vacuumize for nitrogen replacement , under the condition of nitrogen protection, raise the temperature to 140°C, react at 140°C for 1 hour, and raise the temperature to 170°C for 3 hours. After the reaction, a polylactide polyol with a viscosity average molecular weight of 510.0 was obtained.

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Abstract

The invention relates to a method for obtaining polylactide polyol by a way of ring-opening polymerization of lactide with lactide and a polyol as direct raw materials. The method includes the following steps: A, lactide purification: a crude product lactide is purified, and lactide with the content of more than 99.5% and the optical purity of more than 99% is obtained; B, synthesis of polylactide polyol: the purified lactide and the polyol are added into a reaction kettle, then a catalyst is added according to a lactide weight ratio of 0.5 / 1000-1 / 1000 into the reaction kettle for polymerization, and polylactide polyol with the viscosity average molecular weight of 100-5000 is obtained, wherein the catalyst is a composite catalyst comprising one or more of zinc lactate, zinc oxide, zinc powder, diethyl zinc, tin lactate, tin oxide, tin dioxide, stannous oxide, stannous lactate, stannous octoate, stannous chloride, tin powder, propionic acid or tetrabutyl titanate. The method has simple process and easy operation, is suitable for industrialized production applications, and has no 'three wastes' emissions.

Description

technical field [0001] The invention belongs to the technical field of organic macromolecules, and in particular relates to a method for obtaining polylactide polyols by lactide ring-opening polymerization with lactide and polyols as direct raw materials. Background technique [0002] In terms of resin modification, polylactic acid polyols can be used to improve the flexibility, fluidity, low-temperature impact resistance, formability, etc. of resins such as acrylic, polyester, and vinyl; Compared with other polyethers and polyesters, polyurethane adhesives made of alcohol have better color, hydrolytic stability and uniformity; in terms of polyurethane, the cohesive strength and adhesion are strong, and they have higher strength, durability Abrasive. [0003] At the same time, polylactide polyol has the characteristics of biodegradation, can reduce the pressure on the environment, and has broad application prospects. [0004] Polylactide polyol synthesis technology: Chines...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/78
Inventor 杨义浒方文拓徐杰
Owner SHENZHEN ESUN IND
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