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HMW (high-molecular-weight) polylactic acid material and preparation method thereof

A polylactic acid material and a high molecular weight technology are applied in the field of high molecular weight polylactic acid materials and their preparation, which can solve the problems of the influence of the mechanical properties of the material, the inability to obtain a polylactic acid material that can be rapidly formed, and achieve low production cost, increased content and crystallization rate. , the effect of simple process

Active Publication Date: 2019-06-21
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this reference document can obtain rapidly crystallized polylactic acid materials by introducing polyethylene glycol, it cannot obtain high-molecular-weight polylactic acid materials that rapidly form high stereocomplex crystal content, and there is a compatibility issue between polyethylene glycol and polylactic acid. problem, the mechanical properties of the material will be affected

Method used

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  • HMW (high-molecular-weight) polylactic acid material and preparation method thereof

Examples

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preparation example Construction

[0022] The preparation method of the present invention comprises the following steps:

[0023] Step 1, divide the chloroform liquid into two parts, the first part is 35-45% chloroform, and the remainder is the second part;

[0024] Step 2, the preparation of the polylactic acid blend, weigh the left-handed polylactic acid and the right-handed polylactic acid with a molar ratio of 1:1, and dissolve the weighed left-handed polylactic acid and the right-handed polylactic acid into the first chloroform liquid and stir with a magnetic stirrer for 5-8 min at a stirring speed of 200rpm;

[0025] Step 3, pour the solution mixed in step 1 into a clean petri dish, and make the chloroform fully volatilize until the chloroform is completely volatilized;

[0026] Step 4, preparing epoxy prepolymer solution, dissolving one of polyphenol alcohol, urea, propylene glycol, diethylene glycol, 1,3-butanediol or ethylene glycol in the second part of chloroform In the liquid, prepare a 1~3% epoxy...

Embodiment 1

[0030] The mass percent of each component is: 5% of L-polylactic acid, 5% of D-polylactic acid, 0.5% of small molecular substances, and 89.5% of chloroform.

Embodiment 2

[0032] The mass percent of each component is: 5% of L-polylactic acid, 5% of D-polylactic acid, 1% of small molecular substances, and 89% of chloroform.

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Abstract

The invention discloses an HMW (high-molecular-weight) polylactic acid material. The HMW polylactic acid material is prepared from 2%-6% by mass of PLLA (poly(L-lactic acid)), 2%-6% by mass of PDLA(poly(D-lactic acid)), 85%-95% by mass of trichloromethane and 1%-3% by mass of small-molecular substances capable of promoting formation of hydrogen bonds in a system by mixing with a solution blendingmethod. According to the prepared polylactic acid material, semi-crystallization period is shortened obviously, and content of SCs (stereocomplex crystals) is increased obviously. By adopting the small-molecular substances easily forming the hydrogen bonds to promote stereocomplex crystallization of a polylactic acid blending system, the process is simple, the production cost is low, and the polylactic acid material has large-scale production prospects.

Description

technical field [0001] The invention relates to the field of biodegradable polylactic acid materials, in particular to a high-molecular-weight polylactic acid material rapidly forming high stereocomplex crystal content and a preparation method thereof. Background technique [0002] Poly(lactic acid), PLA, a biodegradable polyester material derived from renewable resources, has always been the focus of polymer research and application. In 1987, Ikada et al first reported the stereocomplex (Stereocomplex) formed by blending poly(L-lactic acid), PLLA and poly(D-lactic acid), PDLA. crystal, SC), its melting point is nearly 50 ℃ higher than the homogeneous crystal (Homocrystal, HC) formed by PLLA (or PDLA). Due to higher thermal stability and better mechanical properties, stereocomplex crystals are becoming a prominent research focus in the field of polylactic acid, and the application range of this biodegradable material will also be significantly expanded. [0003] However, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/053C08K5/21C08K5/09
Inventor 李照磊曾瑜叶鑫鑫
Owner JIANGSU UNIV OF SCI & TECH