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Preparation method of degradable polyglycolic acid

A technology of polyglycolic acid and glycolic acid, which is applied in the field of materials, can solve problems such as high vacuum, increased viscosity, and difficult dehydration, and achieve the effect of high mechanical tensile strength

Inactive Publication Date: 2017-02-22
桂林市福泰建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction conditions of direct polycondensation are relatively harsh, the reaction time is long, the temperature is high, the vacuum degree is high, and the viscosity increases in the later stage, resulting in difficulty in dehydration and difficulty in significantly increasing the molecular weight, which limits the development of this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of degradable polyglycolic acid, the preparation steps comprising:

[0020] 1) using glycolic acid as a raw material, dehydrating and refining under vacuum conditions to obtain glycolic acid oligomers;

[0021] 2) mixing the glycolic acid oligomer obtained in step 1) with a catalyst, adding it to a reaction vessel, and heating and reacting under vacuum conditions to obtain a polyglycolic acid intermediate product;

[0022] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polyglycolic acid.

[0023] The vacuum degree in step 1) is 3.3kPa, the dehydration time is 8 hours, and the dehydration temperature range is 120°C.

[0024] The vacuum degree in step 2) is 1.5kPa, the reaction temperature range is 180°C, the reaction time is 8 hours, and the reaction is accompanied by mechanical stirring.

[0025] The catalyst in step 2) is a mixture of two or three of stann...

Embodiment 2

[0030] A preparation method of degradable polyglycolic acid, the preparation steps comprising:

[0031] 1) using glycolic acid as a raw material, dehydrating and refining under vacuum conditions to obtain glycolic acid oligomers;

[0032] 2) mixing the glycolic acid oligomer obtained in step 1) with a catalyst, adding it to a reaction vessel, and heating and reacting under vacuum conditions to obtain a polyglycolic acid intermediate product;

[0033] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polyglycolic acid.

[0034] The vacuum degree in step 1) is 1 kPakPa, the dehydration time is 2 hours, and the dehydration temperature range is 60° C.

[0035] The vacuum degree in step 2) is 1 kPakPa, the reaction temperature range is 120° C., the reaction time is 2 hours, and the reaction is accompanied by mechanical stirring.

[0036] The catalyst in step 2) is a mixture of two or three of...

Embodiment 3

[0041] A preparation method of degradable polyglycolic acid, the preparation steps comprising:

[0042] 1) using glycolic acid as a raw material, dehydrating and refining under vacuum conditions to obtain glycolic acid oligomers;

[0043] 2) mixing the glycolic acid oligomer obtained in step 1) with a catalyst, adding it to a reaction vessel, and heating and reacting under vacuum conditions to obtain a polyglycolic acid intermediate product;

[0044] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polyglycolic acid.

[0045] The vacuum degree in step 1) is 2.5kPa, the dehydration time is 4 hours, and the dehydration temperature range is 80°C.

[0046] The vacuum degree in step 2) is 2kPa, the reaction temperature range is 150°C, the reaction time is 6 hours, and the reaction is accompanied by mechanical stirring.

[0047] The catalyst in step 2) is a mixture of two or three of stannous...

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PUM

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Abstract

The present invention relates to a preparation method of degradable polyglycolic acid. The preparation method comprises the steps of 1) adopting glycolic acid as a raw material, subjecting glycolic acid to dehydrating and refining under the vacuum condition to obtain a glycolic acid oligomer; 2) mixing the obtained glycolic acid oligomer with a catalyst, adding mixed materials into a reaction vessel, and subjecting the materials to heating reaction under the vacuum condition to obtain a polyglycolic acid intermediate; 3) adding a chain extender MDI into the reaction vessel of the step 2), and subjecting materials in the reaction vessel to heating reaction under the vacuum condition to obtain the high-molecular weight polyglycolic acid.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of degradable polyglycolic acid. Background technique [0002] The use of polymer materials has penetrated into various fields of industry, agriculture and daily life. Synthetic polymer materials are mainly derived from petrochemical products, which are not perishable and difficult to degrade. For waste polymer material products, except for a small amount of recycling, the rest are mostly incinerated and landfilled, causing serious pollution and damage to the ecological environment. Biodegradable polymer materials have good biodegradability, rich sources of raw materials, and have similar mechanical properties to traditional petroleum-based polymer materials, so they are very popular. As a chemically synthesized biodegradable polymer material, polyglycolic acid has abundant sources, clean production process, non-toxic and harmless, and excellent performance. It has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08G63/78C08G63/91
CPCC08G63/06C08G63/78C08G63/912C08G2230/00
Inventor 李小福
Owner 桂林市福泰建材有限责任公司
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