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A method for improving the secondary processing stability of polyhydroxy acid

A technology for secondary processing and stability, applied in the field of improving the stability of secondary processing of polyhydroxy acid, can solve the problems of the impact of material performance, mechanical strength, gas barrier performance decline, accelerated degradation of polyhydroxy acid, etc., to achieve high mechanical performance effect

Active Publication Date: 2018-08-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high melting temperature of polyhydroxy acid, the residual metal catalyst will greatly accelerate the degradation of polyhydroxy acid in the process of secondary processing, resulting in a decrease in molecular weight, which will eventually lead to a decrease in mechanical strength and gas barrier properties, and make the material's performance severely affected

Method used

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  • A method for improving the secondary processing stability of polyhydroxy acid
  • A method for improving the secondary processing stability of polyhydroxy acid
  • A method for improving the secondary processing stability of polyhydroxy acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 10g of polyglycolic acid with a molecular weight of 200,000, add dodecanedioic acid dibenzohydrazide according to the addition amount of 0.011mmol / g, mix the two evenly with a pulverizer, and then add them to the German Hacker MiniLab through a feeding funnel at a constant speed In the twin-screw machine, feeding rate: 40g / h; screw speed: 20rpm; twin-screw temperature: 230°C; cooling after extrusion.

Embodiment 2

[0028] Take 10g of the same polyglycolic acid as in Example 1, add dodecanedioic acid di-n-heptanoylhydrazide according to the addition amount of 0.011mmol / g, mix the two evenly with a pulverizer, and then add them to Hacker, Germany at a constant speed through the addition funnel. In the MiniLab twin-screw machine, the processing parameters are the same as in Example 1.

Embodiment 3

[0030] Take 10 g of the same polyglycolic acid as in Example 1, add adipate disalicyylhydrazide according to the addition amount of 0.011 mmol / g, mix the two evenly with a pulverizer, and then add them to the German Hacker MiniLab twin-screw machine through a feeding funnel at a constant speed Among them, processing parameter is with embodiment 1.

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Abstract

The invention belongs to the field of fusion secondary processing of polymeric materials, and particularly relates to a method for improving the secondary processing stability of poly-hydroxy acid. The method comprises the following steps: substances comprising poly-hydroxy acid and bishydrazide are mixed uniformly; an obtained mixture is added to a double screw extrusion machine under the protection of inert gas, is subjected to fusion mixing and is extruded. With the adoption of the method, poly-hydroxy acid after secondary processing has higher molecular weight and mechanical properties.

Description

technical field [0001] The invention belongs to the field of melt secondary processing of polymer materials, in particular to a method for improving the stability of polyhydroxy acid secondary processing. Background technique [0002] Polyhydroxyacids, such as polyglycolic acid and polylactic acid, can be decomposed into water and carbon dioxide by microorganisms in nature, and will not pollute the environment, so they have attracted much attention as a new type of environmentally friendly material. [0003] Due to the advantages of good biocompatibility, high mechanical strength, non-toxic and harmless, and excellent gas barrier properties, polyhydroxy acid is widely used in absorbable surgical sutures, simulated human tissue materials, artificial bones, and tissue engineering scaffolds , drug slow-release carrier, high-strength fiber, food packaging, multi-layer bottle materials and other fields. The preparation methods for preparing polyhydroxyacids mainly include ring-o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/25
CPCC08K5/25C08L67/04
Inventor 崔爱军陈群陈圣春何明阳薛仕翰辛键
Owner CHANGZHOU UNIV
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