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Preparation method of degradable poly(lactic-co-glycolic acid)

A technology of polylactic acid glycolic acid and lactic acid glycolic acid, applied in the field of materials, can solve problems such as refractory degradation, destruction, ecological environment pollution, etc., 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

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of degradable polylactic acid glycolic acid, the preparation steps comprising:

[0019] 1) using industrial-grade lactic acid aqueous solution and glycolic acid as raw materials, dehydrating and refining under vacuum conditions to obtain lactic acid glycolic acid oligomers;

[0020] 2) mixing the lactic acid 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 polylactic acid glycolic acid intermediate product;

[0021] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polylactic acid glycolic acid.

[0022] The vacuum degree in step 1) is 3.3kPa, the dehydration time is 8 hours, the dehydration temperature range is 120°C, and the molar ratio of lactic acid to glycolic acid is 1:3.

[0023] The vacuum degree in step 2) is 1.5kPa, the reaction temperature range is...

Embodiment 2

[0029] A preparation method of degradable polylactic acid glycolic acid, the preparation steps comprising:

[0030] 1) using industrial-grade lactic acid aqueous solution and glycolic acid as raw materials, dehydrating and refining under vacuum conditions to obtain lactic acid glycolic acid oligomers;

[0031] 2) mixing the lactic acid 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 polylactic acid glycolic acid intermediate product;

[0032] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polylactic acid glycolic acid.

[0033] The vacuum degree in step 1) is 1kPakPa, the dehydration time is 2 hours, the dehydration temperature range is 60°C, and the molar ratio of lactic acid to glycolic acid is 1:1.

[0034] The vacuum degree in step 2) is 1 kPakPa, the reaction temperature range ...

Embodiment 3

[0040] A preparation method of degradable polylactic acid glycolic acid, the preparation steps comprising:

[0041] 1) using industrial-grade lactic acid aqueous solution and glycolic acid as raw materials, dehydrating and refining under vacuum conditions to obtain lactic acid glycolic acid oligomers;

[0042] 2) mixing the lactic acid 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 polylactic acid glycolic acid intermediate product;

[0043] 3) Add chain extender MDI to the reaction vessel in step 2), and heat the reaction under vacuum conditions to obtain high molecular weight polylactic acid glycolic acid.

[0044] The vacuum degree in step 1) is 2.5kPa, the dehydration time is 4 hours, the dehydration temperature range is 80°C, and the molar ratio of lactic acid to glycolic acid is 1:1.5.

[0045] The vacuum degree in step 2) is 2kPa, the reaction temperature range is ...

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PUM

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Abstract

The invention relates to a preparation method of degradable poly(lactic-co-glycolic acid). The preparation method comprises the following steps: 1) dehydrating and refining an industrial lactic acid water solution and glycolic acid as raw materials under vacuum conditions, thus obtaining a lactic-co-glycolic acid oligomer; 2) mixing the lactic-co-glycolic acid oligomer obtained in the step 1) with a catalyst, adding the mixture to a reaction vessel and carrying out heating reaction under vacuum conditions, thus obtaining a poly(lactic-co-glycolic acid) intermediate product; and 3) adding a chain extender MDI to the reaction vessel in the step 2) and carrying out heating reaction under vacuum conditions, thus obtaining high molecular weight poly(lactic-co-glycolic acid).

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of degradable polylactic acid glycolic 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, polylactic acid glycolic acid has abundant sources, clean production process, non-toxic and harmless, and excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08G63/85C08G63/87C08G63/91
CPCC08G63/06C08G63/85C08G63/87C08G63/912C08G2230/00
Inventor 李小福
Owner 桂林市福泰建材有限责任公司
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