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Environment-friendly heat-resistant polylactic acid and preparation method thereof

An environmentally friendly polylactic acid technology, applied in the field of polymer material processing technology, can solve the problems of polylactic acid materials such as the decline in environmental friendliness, and achieve the effects of avoiding the decline in mechanical properties, accelerating the crystallization rate, and improving heat resistance and mechanical properties

Inactive Publication Date: 2013-12-04
北京华哲经纬生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, most of the nucleating agents used in the previously disclosed patent polylactic acid are non-degradable organic substances, which will lead to a decline in the environmental friendliness of the polylactic acid material. What is disclosed in the present invention is an environmentally friendly heat-resistant type Polylactic acid material method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] Preparation of two nucleating agents

[0019] Preparation of nucleating agent 1 (NA1)

[0020] The L-polylactic acid and the D-polylactic acid with a weight average molecular weight of 60000g / mol were melt-blended at a ratio of 1:3 and granulated. The extrusion temperature is shown in Table 1, and the screw speed is 200 rpm. Place the granulated product in an oven at 110°C for 20 minutes.

[0021] Preparation of Nucleating Agent 2 (NA2)

[0022] The L-polylactic acid and the D-polylactic acid with a weight average molecular weight of 60000g / mol were melt-blended at a ratio of 3:1 and granulated. The extrusion temperature is shown in Table 1, and the screw speed is 200 rpm. Place the granulated product in an oven at 135°C for 5 minutes.

[0023] Table 1 Temperature distribution of each section of the extruder

[0024]

[0025] Comparative Examples and Examples

Embodiment 1

[0030] Example 1: Preparation of polylactic acid / NA1 spline

[0031] 100 parts of vacuum-dried semi-crystalline poly-L-lactic acid (weight average molecular weight 15W g / mol) and 0.1 part of NA1 nucleating agent were extruded into pellets in a twin-screw extruder, and then the polylactic acid particles were injection-molded into national standard test samples Article, to be tested. Its crystallization rate, heat distortion temperature and mechanical properties are shown in Table 2.

Embodiment 2

[0032] Embodiment two: the preparation of polylactic acid / NA2 spline

[0033] 100 parts of vacuum-dried semi-crystalline poly-L-lactic acid (weight average molecular weight 15W g / mol) and 1 part of NA2 nucleating agent were extruded and granulated in a twin-screw extruder, and then the polylactic acid particles were injection-molded into national standard test samples Article, to be tested. Its crystallization rate, heat distortion temperature and mechanical properties are shown in Table 2.

[0034] Table 2 embodiment sample performance

[0035]

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PUM

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Abstract

The invention provides an environment-friendly heat-resistant polylactic acid and a preparation method thereof, and belongs to the field of polymer material processing technology. The preparation method comprises the following steps: performing melt extrusion and pelleting on L-polylactic acid and D-polylactic acid according to a certain proportion by a double-screw extruder with the extrusion temperature of 160-190 DEG C; drying the mixture, and performing annealing treatment on the mixture to obtain a nucleating agent; performing melt blending extrusion on the nucleating agent and industrial polylactic acid proportionally, and performing injection molding on the blend. According to the method, the crystallization rate of the polylactic acid is greatly improved to increase the crystallinity of the polylactic acid, refine the grain size of the polylactic acid, shorten molding cycle of the polylactic acid, improve the dimensional stability and heat resistance of the polylactic acid, and improve the mechanical performance of polylactic acid products.

Description

technical field [0001] The invention specifically relates to a method for preparing an environment-friendly heat-resistant polylactic acid material by using a novel nucleating agent. The invention belongs to the field of polymer material processing technology. Background technique [0002] Polylactic acid (PLA) is an important lactic acid derivative. It is a kind of polymer material obtained by chemical synthesis or biosynthesis with lactic acid as a monomer. It is non-toxic, non-irritating, and has excellent biocompatibility. Biodegradable and absorbable, strong plasticity, easy to process and shape. It is easily decomposed and metabolized by various microorganisms in nature or enzymes in animals and plants, and finally forms water and carbon dioxide without polluting the environment, so it is considered to be one of the most promising biodegradable polymer materials. Its biggest advantage is its renewability and degradability. Renewability makes its production not depen...

Claims

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Application Information

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IPC IPC(8): C08L67/04
Inventor 邹国享李锦春赵彩霞张鑫宋艳焦青伟
Owner 北京华哲经纬生物科技有限公司
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