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Method for reducing yellowness index of polyglycolic acid

A yellowness index, polyglycolic acid technology, applied in the field of polyglycolic acid manufacturing, can solve the problems of strong yellow coloration and inability to obtain color products, etc.

Inactive Publication Date: 2016-05-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the current polyglycolic acid is used as a raw material, the yellow coloring becomes stronger, which may cause a problem that the desired color product may not be obtained

Method used

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  • Method for reducing yellowness index of polyglycolic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 10 g of glycolide to the single-necked flask under nitrogen protection, and inject 4.02 μLSn(Oct) into the reaction flask using a micro-sampling needle 2 . A magnetic stirrer was used to stir the monomer and the catalyst, and the reactants were heated and polymerized in an oil bath, and the polymerization was carried out at 170° C. for 60 min. After the polymerization was completed, the reaction bottle was broken to take out the product. Afterwards, the molecular weight, monomer conversion rate and yellowness index of the polymer were measured, and the relevant results are shown in Table 1.

Embodiment 2

[0055] Add 10g glycolide and 0.00325gPh to the single-necked flask under nitrogen protection 3 P, inject 4.00μLSn(Oct) into the reaction vial using a microsyringe 2 . A magnetic stirrer was used to stir the monomer and the catalyst, and the reactants were heated and polymerized in an oil bath, and the polymerization was carried out at 170° C. for 60 min. After the polymerization was completed, the reaction bottle was broken to take out the product. Afterwards, the molecular weight, monomer conversion rate and yellowness index of the polymer were measured, and the relevant results are shown in Table 1.

Embodiment 3

[0057] Add 10 g of glycolide and 0.00512 g of SnO to the single-necked flask under nitrogen protection. A magnetic stirrer was used to stir the monomer and the catalyst, and the reactants were heated and polymerized in an oil bath, and the polymerization was carried out at 200° C. for 40 min. After the polymerization was completed, the reaction bottle was broken to take out the product. Afterwards, the molecular weight, monomer conversion rate and yellowness index of the polymer were measured, and the relevant results are shown in Table 1.

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Abstract

The invention provides a method for preparing polyglycolic acid. The yellowness index of polyglycolic acid is very low, and even when the polymerization temperature is high, the yellowness index of the product is also low. A catalyst is a composite catalyst, and the main component of the composite catalyst is a mixture of a traditional metal catalyst and an additive of an equal amount of substance. Compared with a single metal catalyst system, the catalytic activity of the composite catalyst is greatly improved. The polymerization reaction time is shortened to be within 20 min, and thus the polyglycolic acid production efficiency is greatly improved. The yellowness index of polyglycolic acid prepared through the method is low.

Description

technical field [0001] The invention relates to a method for producing polyglycolic acid. The method is to add an additive to a metal catalyst that catalyzes the ring-opening polymerization of glycolide, thereby effectively reducing the yellowness index of the product. Background technique [0002] Disposing of the vast amount of waste has been one of the serious problems facing the world over the past few centuries. For example, each household in the United States produces 3,000kg of waste each year, which must be properly disposed of. Degradable materials can play an important role in dealing with waste (Ref. 1). [0003] Polyglycolic acid (PGA) is a degradable aliphatic polyester, its research and development work has been carried out for decades, it is mainly used in the medical field (references 2 ~ 4). In addition, it is recognized as a suitable polymer for future packaging applications (refs 5, 6). PGA has good mechanical properties and is comparable to today's st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/85C08G63/83C08G63/78
CPCC08G63/08C08G63/78C08G63/823C08G63/85
Inventor 陈群高建崔爱军何明阳
Owner CHANGZHOU UNIV
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