Method for preparing high-crystallinity polylactic acid material or article with high crystallization rate

A technology of polylactic acid materials and high crystallinity, which is applied in the field of polymer materials, can solve the problems of limited promotion of polylactic acid crystallization, and achieve the effects of promoting crystallization rate, increasing crystallinity, and high nucleation efficiency

Active Publication Date: 2014-10-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing methods for obtaining polylactic acid samples with high crystallinity have a limited effect on the crystallization of polylactic acid under the extremely fast cooling rate in actual processing, that is, only polylactic acid with low crystallinity can be obtained through conventional processing and molding methods sample

Method used

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  • Method for preparing high-crystallinity polylactic acid material or article with high crystallization rate
  • Method for preparing high-crystallinity polylactic acid material or article with high crystallization rate
  • Method for preparing high-crystallinity polylactic acid material or article with high crystallization rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Anneal the lactic acid polymer with a higher melting point at 60°C to 200°C for later use;

[0021] (2) Pulverize the lactic acid polymer resin with a higher melting point in step (1) into powder at room temperature for later use; dry poly-L-lactic acid with a melting point lower than that of the nucleating agent in a vacuum oven at 60°C for 12 h spare;

[0022] (3) The lactic acid polymer resin with higher melting point and polylactic acid with low melting point in step (2) are blended and granulated at 170°C by Haake rheometer at a mass ratio of 0.1:99.9.

Embodiment 2

[0024] (1) Anneal the lactic acid polymer with a higher melting point at 60°C to 200°C for later use;

[0025] (2) Pulverize the lactic acid polymer resin with a higher melting point in step (1) into powder at room temperature for later use; dry poly-L-lactic acid with a melting point lower than that of the nucleating agent in a vacuum oven at 60°C for 12 h spare;

[0026] (3) The lactic acid polymer resin with higher melting point and polylactic acid with low melting point in step (2) are blended and granulated at 170°C by Haake rheometer at a mass ratio of 1:99.

Embodiment 3

[0028] ((1) Anneal the lactic acid polymer with a higher melting point at 60°C to 200°C for later use;

[0029] (2) Pulverize the lactic acid polymer resin with a higher melting point in step (1) into powder at room temperature for later use; dry poly-L-lactic acid with a melting point lower than that of the nucleating agent in a vacuum oven at 60°C for 12 h spare;

[0030] (3) The lactic acid polymer resin with higher melting point and polylactic acid with low melting point in step (2) are blended and granulated at 170°C by Haake rheometer at a mass ratio of 5:95.

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Abstract

The invention discloses a method for preparing a high-crystallinity polylactic acid material or article with a high crystallization rate. The method comprises the following steps of pulverizing a certain proportion of high-melting-point lactic acid-based polymer with an orthorhombic system crystal and sieving, annealing and adding into a polylactic acid and polylactic acid blended system and processing in a specific processing temperature range by virtue of a melt-processing method to obtain the high-crystallinity polylactic acid material or article with the high crystallization rate. The added high-melting-point lactic acid-based polymer can be used as a nucleating agent for polylactic acid to greatly contribute to the crystallization of polylactic acid, and the crystallization of polylactic acid can be efficiently promoted at a relatively fast cooling rate and thus a high-crystallinity polylactic acid sample is obtained, and since the added lactic acid-based polymer is biodegradable, the polylactic acid material or product prepared by the method has high crystallinity and can be completely biodegradable. The method has the advantages of simple process and low cost and easily operated.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a high-crystallinity polylactic acid material or product with a high crystallization rate. 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 being renewable and degradable, polylactic acid also has high strength, high strength, moderate gas barrier properties, high transpare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04
Inventor 杨伟尹海燕魏馨丰包睿莹刘正英谢邦互杨鸣波
Owner SICHUAN UNIV
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