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Method for preparing polylactic acid/nanometer silicon dioxide composite material

A technology of nano-silica and composite materials, applied in the field of polymer-based composite materials, which can solve the problems of low mechanical properties and biocompatibility, and poor heat resistance of polylactic acid

Inactive Publication Date: 2009-09-02
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid has poor heat resistance, low mechanical properties and biocompatibility, and at the same time, there are some special functional requirements in practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 95% lactide with 4.9% modified nano-silica, then add 0.1% powdered catalyst stannous chloride, keep the system in a high vacuum state, heat the mixture under stirring until the polymerization reaction Polymerize at a temperature of 150°C and keep warm for 16 hours to obtain a polylactic acid / nano silicon dioxide composite material.

Embodiment 2

[0016] Mix 96.8% lactide with 3% modified nano-silica, then add 0.2% powder catalyst stannous octoate, keep the system in a high vacuum state, heat the mixture to the polymerization reaction temperature under stirring Polymerize at 150°C and keep warm for 16 hours to obtain polylactic acid / nano silicon dioxide composite material.

Embodiment 3

[0018] Mix 91% lactide with 8.9% modified nano-silica, then add 0.1% powder catalyst stannous octoate, keep the system in a high vacuum state, heat the mixture to the polymerization reaction temperature under stirring Polymerize at 150°C and keep warm for 16 hours to obtain polylactic acid / nano silicon dioxide composite material.

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PUM

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Abstract

The invention discloses a method for preparing a polylactic acid / nanometer silicon dioxide composite material. A silane coupling agent is adopted to perform chemical surface modification on silicon dioxide; the modified silicon dioxide and lactide are taken as raw materials, and a system is kept in a high vacuum state in the presence of a catalyst; the temperature is higher than 140 DEG C, and the in-situ ring-opening polymerization is performed with stirring of a magnetic force; and the polylactic acid / nanometer silicon dioxide composite material is obtained. In the method, during the in-situ polymerization, lactide ring-opening polymerization is performed to form polylactic acid, and the polylactic acid is grafted to the surface of SiO2 in the form of a covalent bond so as to obtain the polylactic acid / nanometer silicon dioxide composite material with high dispersivity.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid / nano-silicon dioxide composite material, belongs to the field of polymer-based composite materials, and is a fully degradable composite material. Background technique [0002] With the rapid growth of the world's population, the predatory exploitation of global resources by human beings, and the mass production, consumption, and abandonment of polymer products synthesized from petroleum and other petrochemical resources, environmental protection problems are becoming more and more serious. In order to solve the problem that synthetic resins and fibers are not easy to be decomposed by the environment, various biodegradable synthetic resins and fibers have been developed. Polylactic acid (PLA) is one of the biodegradable polymers with more research and better performance. Material. After PLA products are discarded, they will be decomposed into natural small molecules CO in soil or water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/06C08G63/78C08G63/08
Inventor 冯辉霞赵丹张茵郭静威陈娜丽张建强雒和明
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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