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A kind of in-situ generated polylactic acid compound and its preparation method

A technology of polylactic acid and composites, which is applied in the field of biodegradable polymer materials, can solve the problems of limiting the use range of materials, complex process steps, and limiting wide application, etc., to achieve good film-forming properties, improve dispersibility, and reduce order The effect of arrangement

Active Publication Date: 2017-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To some extent, it limits its wide application in fields such as medicine, agriculture and packaging.
In the prior art, there is a technology of blending star-shaped polylactic acid and linear polylactic acid by melt blending method. The process steps of this method are relatively complicated, and the process of melt blending is easy to cause degradation of polylactic acid, resulting in discoloration of the material, which limits the quality of the material. scope of use and increased cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The L-lactide of 500g is joined in the reaction vessel that is connected with inert gas, slowly heats up to reactant melting and stirs by oil bath, then adds catalyst stannous octoate 0.05wt% and glycerol 0.6wt%, raises The reaction was carried out at a temperature of 180° C. for 1.5 hours, and samples were taken for analysis. Then add 3wt% 1,4-butanediol to continue the reaction for 2h, and finally obtain the complex. According to the GPC test, after adding glycerol to initiate polymerization, the number average molecular weight is 29,000, and the molecular weight distribution is 1.16. After adding 1,4-butanediol for polymerization, the number average molecular weight of the obtained polylactic acid composite is 14,600, and the molecular weight distribution is 1.89.

Embodiment 2

[0035]The L-lactide of 500g is joined in the reaction container that is connected with inert gas, slowly heats up to reactant melting and stirs by oil bath, then adds catalyst stannous octoate 0.05wt% and glycerol 0.15wt%, raises The reaction was carried out at a temperature of 180° C. for 1.5 hours, and samples were taken for analysis. Then add 3wt% 1,4-butanediol to continue the reaction for 2h, and finally obtain the complex. According to the GPC test, after adding glycerol to initiate polymerization, the number average molecular weight is 43,000, and the molecular weight distribution is 1.18. After adding 1,4-butanediol for polymerization, the number average molecular weight of the obtained polylactic acid composite is 28,600, and the molecular weight distribution is 2.32.

Embodiment 3

[0037] The L-lactide of 500g is joined in the reaction container that is connected with inert gas, slowly heats up to reactant melting and stirs by oil bath, then adds catalyst stannous octoate 0.05wt% and glycerol 0.15wt%, raises The reaction was carried out at a temperature of 180° C. for 1.5 hours, and samples were taken for analysis. Then add 1.5wt% 1,4-butanediol to continue the reaction for 2h, and finally obtain the complex. According to the GPC test, after adding glycerol to initiate polymerization, the number average molecular weight is 43000, and the molecular weight distribution is 1.18. After adding 1,4-butanediol for polymerization, the obtained polylactic acid composite has a number average molecular weight of 31000, and the molecular weight distribution is 2.09.

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PUM

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Abstract

The invention relates to a polylactic acid compound, which comprises polymerizing lactide under the action of an initiator system and a catalyst, and directly obtains a polylactic acid compound comprising star polylactic acid and linear polylactic acid after polymerization, The initiator system includes star coinitiators and diol coinitiators. According to the present invention, the polylactic acid compound has excellent comprehensive properties, good mechanical properties, good toughness and viscosity, and wide molecular weight distribution, which is beneficial to improve dispersibility and processability. The polylactic acid compound can be used to prepare films, sheets, foams, coatings and adhesives, and has broad application prospects; it can especially be used as coating materials.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a polylactic acid compound generated in situ. The present invention also relates to the preparation method of the above complex. Background technique [0002] The mass production and use of synthetic polymer materials has produced two major issues: the massive consumption of limited petroleum resources and the environmental pollution caused by waste polymers. Under such circumstances, environmentally friendly biodegradable materials have emerged and flourished. Among the many biodegradable polymer materials that have been developed, polylactic acid (PLA) is made of renewable resource plants, which is non-toxic, non-irritating, and has excellent biocompatibility, bioabsorption, and complete biodegradability. , At the same time, it also has excellent physical and mechanical properties, so it has attracted more and more attention. [0003] Polymer linear polylactic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/664C08L67/04C09D167/04
Inventor 杜影赵丽娜邓燕霞孟伟娟齐可非唐伟刚
Owner CHINA PETROLEUM & CHEM CORP
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