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A method for reducing the melting temperature of polylactic acid by using lactic acid monomer and its composite material

A technology of lactic acid monomer and composite materials, which is applied in the processing field of reducing the melting temperature of polylactic acid, can solve the problems of environmental friendly damage of polylactic acid, and achieve the effect of lowering the melting temperature and lowering the banburying temperature

Active Publication Date: 2021-07-27
WUHAN ENG SCI & TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the addition of organic solvents such as dimethyl sulfoxide as a co-solvent, which damages the environmental friendliness of polylactic acid.

Method used

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  • A method for reducing the melting temperature of polylactic acid by using lactic acid monomer and its composite material
  • A method for reducing the melting temperature of polylactic acid by using lactic acid monomer and its composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix polylactic acid and lactic acid monomer uniformly at a mass ratio of 98:2, pour into an internal mixer and stir at a temperature of 135°C until melted to obtain a polylactic acid-lactic acid composite material, which is named P98L2.

Embodiment 2-5

[0019] The preparation method was the same as in Example 1, except that the banburying temperature was changed to 180°C, 160°C, 140°C and 130°C.

[0020] Table 1: Effect of 2% lactic acid monomer on melting effect of polylactic acid

[0021]

[0022] * Y indicates that it can be melted, and N indicates that it cannot be melted.

[0023] Table 1 shows the effect of adding 2% lactic acid monomer on the melting point of polylactic acid. It can be seen from the prior art that without adding any plasticizer, the processing temperature of pure polylactic acid is 180°C. After adding 2% mass fraction of lactic acid monomer, the melting point of polylactic acid decreases from 180°C to 135°C. It shows that in the process of banburying, lactic acid can play a plasticizing effect on polylactic acid.

Embodiment 6-9

[0025] The preparation method is the same as in Example 1, except that the mass fraction of lactic acid becomes 1%, 4%, 6% and 8%, and the obtained polylactic acid-lactic acid composite materials are named P99L1, P96L4, P94L6, P92L8 respectively .

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Abstract

The invention relates to a method for reducing the melting temperature of polylactic acid by utilizing lactic acid monomer and a composite material thereof. The polylactic acid is mixed with a small amount of monomeric lactic acid, and then poured into an internal mixer for melting and blending. Only a small amount of lactic acid monomer can effectively reduce the mixing temperature of polylactic acid, and the structure and performance of the obtained polylactic acid-lactic acid composite material can be regulated by adjusting the amount of lactic acid monomer.

Description

technical field [0001] The invention relates to a novel processing method for reducing the melting temperature of polylactic acid. Background technique [0002] Polylactic acid has good biocompatibility, degradability, mechanical properties and processing properties. It is formed by ring-opening polymerization of lactide or by hydrolysis and fermentation of carbohydrates such as starch and cellulose in various renewable natural resources. Polylactic acid material has the advantages of high strength and good mechanical properties, but it also has some disadvantages, such as insufficient mechanical strength and high glass transition temperature, making it suitable for use with When the biomass-based phase in daily life is melt-mixed to prepare composite materials, there are problems such as large difference in melting point and high price, which limit its application. [0003] The melting point of polylactic acid is too high, which is not conducive to processing with some bio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/09
Inventor 张宇窦晓亚
Owner WUHAN ENG SCI & TECH RESINST