Completely-degradable polylactic acid composite material with high crystallinity and preparation method thereof

A composite material, high crystallinity technology, applied in the field of high crystallinity fully degradable polylactic acid composite material and its preparation field, can solve problems such as damage to polylactic acid biodegradability, low crystallinity, etc., achieve easy operation, improve Effects of crystallinity, improved heat resistance and gas barrier properties

Active Publication Date: 2013-08-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding nucleating agents or plasticizers at present can only increase the crystallization rate of polylactic acid to a certain extent, and often still obtain samples with low crystallinity during the rapid cooling process.
In addition, the addition of inorganic nucleating agents can impair the biodegradability of PLA

Method used

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  • Completely-degradable polylactic acid composite material with high crystallinity and preparation method thereof
  • Completely-degradable polylactic acid composite material with high crystallinity and preparation method thereof
  • Completely-degradable polylactic acid composite material with high crystallinity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 10g of poly-L-lactic acid to 100ml of dichloromethane solution at room temperature, stir for 3h; stand for later use; add 0.1g of poly-D-lactic acid to 10ml of dichloromethane solution, stir for 3h; stand for later use; Add 0.5g of polyethylene glycol to 10ml of dichloromethane solution, stir for 3h; stand for later use;

[0029] (2) Add all the poly(D-lactic acid dichloromethane solution) and the polyethylene glycol dichloromethane solution prepared in step (1) into the poly(L-lactic acid dichloromethane solution), and stir for 3 hours;

[0030] (3) The solution prepared in step (2) was left to stand at room temperature for 48 hours, and the solvent was evaporated to remove;

[0031] (4) The product obtained in step (3) was vacuum-dried at 50° C. for 48 hours to obtain a poly-L-lactic acid / poly-d-lactic acid / polyethylene glycol composite material sample with a ratio of (100 / 1 / 5).

Embodiment 2

[0033] (1) Add 10g of poly-L-lactic acid to 100ml of dichloromethane solution at room temperature, stir for 3h; stand for later use; add 0.1g of poly-D-lactic acid to 10ml of dichloromethane solution, stir for 3h; stand for later use; Add 1g of polyethylene glycol to 10ml of dichloromethane solution, stir for 3h; let it stand for later use;

[0034] (2) Add all the poly(D-lactic acid dichloromethane solution) and the polyethylene glycol dichloromethane solution prepared in step (1) into the poly(L-lactic acid dichloromethane solution), and stir for 3 hours;

[0035] (3) The solution prepared in step (2) was left to stand at room temperature for 48 hours, and the solvent was evaporated to remove;

[0036] (4) The product obtained in step (3) was vacuum-dried at 50° C. for 48 hours to obtain a poly-L-lactic acid / poly-d-lactic acid / polyethylene glycol composite material sample with a ratio of (100 / 1 / 10).

Embodiment 3

[0038] (1) Add 10g of poly-L-lactic acid to 100ml of dichloromethane solution at room temperature, stir for 3h; stand for later use; add 0.1g of poly-D-lactic acid to 10ml of dichloromethane solution, stir for 3h; stand for later use; Add 2g of polyethylene glycol to 10ml of dichloromethane solution, stir for 3h; let it stand for later use;

[0039] (2) Add all the poly(D-lactic acid dichloromethane solution) and the polyethylene glycol dichloromethane solution prepared in step (1) into the poly(L-lactic acid dichloromethane solution), and stir for 3 hours;

[0040] (3) The solution prepared in step (2) was left to stand at room temperature for 48 hours, and the solvent was evaporated to remove;

[0041] (4) The product obtained in step (3) was vacuum-dried at 50° C. for 48 hours to obtain a poly-L-lactic acid / poly-d-lactic acid / polyethylene glycol composite material sample with a ratio of (100 / 1 / 20).

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Abstract

The invention discloses a completely-degradable polylactic acid composite material with high crystallinity. A poly-dextrolactic acid / poly-levolactic acid / polyethylene glycol composite material is prepared by the step of adding the polyethylene glycol poly-dextrolactic acid and the polyethylene glycol according to a certain ratio into the poly-levolactic acid in a solution blending way or a melt blending way. A stereo-structure composite crystal and a plasticizer polyethylene glycol which are generated in the blending process of the poly-dextrolactic acid and the poly-levolactic acid jointly accelerate the crystallization of the poly-levolactic acid, so that a polylactic acid sample with high crystallinity can be obtained in a fast cooling process; and all components added in the composite material are biodegradable, i.e., the composite material has high crystallinity and is also completely biodegradable. The preparation technology is simple, easy to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a fully degradable polylactic acid composite material with high crystallinity and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, the problems of plastic pollution and petrochemical resources have become the focus of worldwide attention. The sustainable development of biodegradable polymer materials using biomass and natural resources as raw materials has become a research and application development direction that has attracted worldwide attention. [0003] Polylactic acid (PLA) is currently the most widely used variety of synthetic biodegradable polymer materials, and it will gradually partially replace polyolefins and be widely used in the field of general plastics. In addition to its renewable and degradable properties, polylactic acid also has high strength, high strength, moderate gas barrier properties, high tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L71/08
Inventor 杨伟魏馨丰曹志强包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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