Method for preparing high-branched poly lactic acid through bulk polymerization

A technology of bulk polymerization and polylactic acid, which is applied in the field of bulk polymerization to prepare highly branched polylactic acid, which can solve the problems of wide use of difficult materials, low molecular weight of polylactic acid, and long reaction cycle

Active Publication Date: 2005-01-12
马鞍山同杰良生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The relative molecular weight of the polylactic acid prepared by direct polycondensation is relatively low. In the patent JP59-96123, polylactic acid is prepared by direct polycondensation under reduced pressure and high temperature in the presence of a catalyst. However, the obtained polylactic acid has a very low molecular weight and is difficult to use as a material. Widely used; the patent US5310865 uses an organic solvent azeotropic dehydration solution to polymerize polylactic acid, and the disadvantages are that the reaction cycle is long and the molecular weight is not high; in the patent US4273920, the molecular weight of the polylactic acid prepared by direct polycondensation using a strong acidic ion exchange resin can reach 30,000

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 150 grams of 85% pure L-lactic acid into a 500ml four-necked flask equipped with a thermometer, a stirrer and a nitrogen introduction tube, pour nitrogen into it, heat to 100°C, and stir for dehydration under the conditions of a vacuum of 80mmHg for 2 hours. After removing about 40 g of water, add 0.1 g of stannous chloride, gradually increase the temperature from 100°C to 140°C, and polycondensate at a vacuum of 50mmHg for 20 hours to obtain a lactic acid polymer with a weight average molecular weight of 9,600. 2wt% of hexanediol was added and reacted for 10 hours, and terephthalic acid (-COOH / -OH=1.2, molar ratio) was added to continue the reaction for 10 hours, and finally polylactic acid with a weight average molecular weight of 154,000 was obtained.

Embodiment 2-6

[0028] Based on Example 1, the catalyst was changed, and the results are as follows:

[0029] Catalyst weight average molecular weight of polylactic acid

[0030] Antimony trioxide 96,000

[0031] Stannous octoate 107,000

[0032] Diethyl zinc 85,000

[0033] Tin 148,000

[0034] Alumina 118,000

Embodiment 7

[0036] Based on Example 1, using 2,4-toluene diisocyanate instead of adipic acid, polylactic acid with a weight average molecular weight of 194,000 was finally obtained.

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PUM

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Abstract

A high branched polylactic is prepared by utilizing chain extendor which includes A containing two or multiple functional groups being able to reat with hydroxy radical and B containing two or multiple functional groups being able to react with carboxyl radical. A and B are not substances of two functional groups at the same time.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials, and specifically relates to a method for preparing hyperbranched polylactic acid by bulk polymerization. Background technique [0002] Environmental pollution and resource shortage have received widespread attention as a global problem. Among them, white pollution and oil crisis are particularly important. As a material, plastic has excellent performance, but plastic is mainly derived from non-renewable resource petroleum, and it has caused serious white pollution at present. Polylactic acid is a typical biodegradable plastic. It comes from renewable resources such as corn and other crops, and the waste can be quickly degraded into harmless small molecules in nature. Therefore, polylactic acid has been widely studied as an environmentally friendly material. And application. [0003] There are two main methods for preparing polylactic acid, ring-opening polymerization and direct polycondensat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/06C08G63/78
Inventor 任杰王秦峰张乃文
Owner 马鞍山同杰良生物材料有限公司
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