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A preparation method of all bio-based composite materials capable of rapid stereocombination after melting

A composite material and stereocomposite technology, which is applied in the field of preparation of all-bio-based composite materials, can solve the problems of unfavorable food packaging application, complex polylactic acid stereocomplex process, low rate of stereocomplex, etc., and achieves easy realization. , Improve physical and mechanical properties, the effect of fast speed

Active Publication Date: 2016-10-26
上海英华辰睿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above patented technology introduces non-bio-based and non-biodegradable components (such as metal salts), which is not conducive to the application in food packaging and other fields, and the rate of stereocomplex formation during the cooling process after melting of the stereocomplex is still small
On the other hand, the process of preparing polylactic acid stereocomplex with the existing patented technology is complicated, and the required equipment can only be realized through special design.

Method used

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  • A preparation method of all bio-based composite materials capable of rapid stereocombination after melting
  • A preparation method of all bio-based composite materials capable of rapid stereocombination after melting
  • A preparation method of all bio-based composite materials capable of rapid stereocombination after melting

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Effect test

Embodiment 1

[0027] First, the L-polylactic acid and the D-polylactic acid are dissolved in chloroform at room temperature according to the weight ratio to obtain a polylactic acid mixture A, and a certain mass of nanocellulose is ultrasonically dispersed in chloroform at room temperature to obtain a mixture B. Then mixture A and mixture B were mixed and stirred thoroughly to obtain mixture C, and mixture C was desolvated at 40° C. to obtain a kind of all-bio-based composite film (wherein PDLA / PLLA / NCC=55 / 45 / 0.5, weight ratio ).

Embodiment 2

[0029] First, the L-polylactic acid and the D-polylactic acid are dissolved in chloroform at room temperature according to the weight ratio to obtain a polylactic acid mixture A, and a certain mass of nanocellulose is ultrasonically dispersed in dichloromethane at room temperature to obtain a mixture B. Then mixture A and mixture B were mixed and stirred well to obtain mixture C, and mixture C was desolvated at 40° C. to obtain a kind of all-bio-based composite film (wherein PDLA / PLLA / NCC=50 / 50 / 1, weight ratio ).

Embodiment 3

[0031] First, the L-polylactic acid and the D-polylactic acid are dissolved in the organic solvent chloroform according to the weight ratio at room temperature to obtain a polylactic acid mixture A, and a certain mass of nanocellulose is ultrasonically dispersed in chloroform at room temperature to obtain a mixture B, then mixture A and mixture B were mixed and fully stirred to obtain mixture C, and mixture C was desolvated at 40° C. to obtain a kind of all-bio-based composite film (wherein PDLA / PLLA / NCC=50 / 50 / 2, weight ratio).

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Abstract

The invention discloses a preparation method of a full-bio-based composite material capable of being rapidly composited stereoscopically after melting. The preparation method includes mixing poly(L-lactic acid) and poly(D-lactic acid) with natural polymers according to a weight ratio by a solution mixing method to obtain the full-bio-based composite material, wherein the melting peak temperature of the composite material is not lower than 220 DEG C, melting enthalpy is not lower than 70J / g, and a high-content polylactic acid stereoscopic composite material can be formed rapidly at the temperature of 110-195 DEG C after the composite material melts at the temperature of 230-260 DEG C. The preparation method is simple in process and easy to industrialize and provides an effective approach for acquiring the high-content polylactic acid stereoscopic composite material through melting and enhancing high performance of polylactic acid materials.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing an all-bio-based composite material capable of rapid stereocomposition after melting. Background technique [0002] As a bio-based and biodegradable polymer material, polylactic acid has received extensive attention. However, the disadvantages of polylactic acid, such as poor toughness and heat resistance, slow crystallization rate and low crystallinity, restrict the application and development of polylactic acid. The polylactic acid stereocombination technology has opened up a new direction for the improvement of the physical and mechanical properties of polylactic acid. [0003] Polylactic acid (PLA) includes L-polylactic acid (PLLA), D-polylactic acid (PDLA) and racemic polylactic acid (PDLLA). L-polylactic acid and d-polylactic acid can form a stereocomplex (SC-PLA) during the blending process. The melting point of SC-PLA is about 50°C highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L3/02C08L1/02
Inventor 马丕明蒋龙吕培王倩倩吴倩东为富陈明清
Owner 上海英华辰睿新材料有限公司
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