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Preparation method of glycolide

A glycolide and ethanol technology, applied in the field of materials, can solve problems such as poor appearance and color, increased production energy consumption, environmental and human hazards, etc.

Pending Publication Date: 2022-05-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain glycolide monomer, but it is difficult for the organic solvent to avoid side reactions such as decomposition and carbonization at high temperature, resulting in the obtained glycolide containing a certain amount of impurities, and the appearance color of the product is also poor, and the obtained glycolide Ester contains organic solvents, which increases the separation steps of products and solvents, increases the production energy consumption of products, and uses a large amount of organic solvents, which will cause great harm to the environment and human body

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  • Preparation method of glycolide

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1.1 760g 100% glycolic acid, 1000g polyethylene (BASF, Luwax A) and 2g catalyst stannous benzoate were successively added to the 3L round-bottomed flask, and the temperature was raised to 160° C. Under agitation, vacuumize to carry out polycondensation reaction, P= 3000Pa, after 4h, the vacuum degree was increased to P=700Pa, and the polycondensation reaction was continued for 12 hours to obtain 570g of oligoglycolic acid.

[0030] The oligoglycolic acid obtained by the present invention is analyzed by gel permeation chromatography according to the above method, and the number-average molecular weight of the polyglycolic acid is measured to be 3100 g / mol.

[0031] 1.2 The oligoglycolic acid in Example 1.1 is heated to 220°C, when the oligoglycolic acid is completely dissolved in polyethylene, it is added dropwise to a temperature of 220°C and contains 1500g polyethylene and 10g cracking catalyst trioxide The depolymerization was carried out in a 5L round-bottomed flask ...

Embodiment 2

[0037] 2.1 900g 100% methyl glycolate, 1500g polyethylene (BASF, Luwax AH3) and 3g catalyst stannous chloride are added successively in the 3L round-bottomed flask, be warming up to 150 ℃, vacuumize under stirring and carry out polycondensation reaction, P=3000Pa, after 4 hours, the vacuum degree was increased to P=700Pa, and the polycondensation was continued for 15 hours to obtain 562 g of oligoglycolic acid.

[0038] The oligoglycolic acid obtained by the present invention is analyzed by gel permeation chromatography according to the above method, and the number-average molecular weight of the polyglycolic acid is measured to be 2600 g / mol.

[0039] 2.2 The oligoglycolic acid in Example 2.1 is heated to 220°C, when the oligoglycolic acid is completely dissolved in polyethylene, it is added dropwise to a temperature of 230°C and contains 1000g polyethylene and 5g cracking catalyst trioxide The depolymerization was carried out in a 5L round-bottomed flask of antimony, and the...

Embodiment 3

[0043] 3.1 1040g 100% ethyl glycolate, 1500g polyethylene (BASF, Luwax AH6) and 4g catalyst stannous octoate were successively added to the 3L round-bottomed flask, and the temperature was raised to 170° C. Under stirring conditions, vacuumize to carry out polycondensation reaction, P =3000Pa, after 3h, the vacuum degree was increased to P=700Pa, and the polycondensation was continued for 10 hours to obtain 565g of oligoglycolic acid.

[0044] The oligoglycolic acid obtained in the present invention is analyzed by gel permeation chromatography according to the above method, and the number-average molecular weight of the polyglycolic acid is measured to be 3500 g / mol.

[0045] 3.2 The oligoglycolic acid in Example 3.1 is heated to 220°C, and when the oligoglycolic acid is completely dissolved in polyethylene, it is added dropwise to a temperature of 240°C and contains 500 g of polyethylene and 5 g of cracking catalyst zinc oxide The depolymerization was carried out in a 5L roun...

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Abstract

The invention provides a glycolide preparation method, which comprises: A) carrying out a condensation polymerization reaction on a glycolic acid monomer under the action of a polyolefin oligomer and a catalyst to obtain a glycolic acid oligomer; and step B) carrying out a cracking reaction on the glycolic acid oligomer under the action of a polyolefin oligomer to obtain glycolide. Polyolefin oligomer is added in the process of preparing oligomer through glycollic acid polycondensation, a polycondensation product can be converted into a viscous flow state from a solid state, and the problems that solid glycollic acid oligomer is difficult to melt and transfer in a pipeline are solved; meanwhile, the polyolefin oligomer is used as the cracking aid, has the advantages of good thermal stability and difficulty in decomposition, solves the problems of deep product color and high product purification difficulty caused by thermal decomposition of the conventional cracking aid, does not need to separate and purify glycolide, and is relatively high in product purity, high in yield, low in production cost and suitable for industrial production. The method can be used for industrial production of glycolide.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of glycolide. Background technique [0002] Polyglycolic acid is a degradable green polymer material with excellent biocompatibility, gas barrier properties and heat resistance, and is non-toxic and non-irritating. Therefore, polyglycolic acid can be used in various packaging. materials and medical polymer materials. At present, the synthesis methods of polyglycolic acid mainly include direct polycondensation method and glycolide ring-opening polymerization method. Glycolic acid is used for direct dehydration and oligomerization, and the molecular weight of the product is low, which is difficult to meet the performance of the material. In order to obtain high-molecular-weight and high-performance polyglycolic acid, it is necessary to adopt the ring-opening polymerization method of glycolide, in which the preparation of glycolide is the key. [0003] Glyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D319/12
CPCC07D319/12Y02P20/10
Inventor 张宝陈学思边新超李杲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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