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A kind of method utilizing glacial acetic acid dissolution to prepare food-grade polylactic acid film

A technology of polylactic acid and glacial acetic acid, which is applied in the field of preparing degradable polylactic acid films, can solve the problems of lack of fluidity of the forming medium and complicated film-making process, and achieves good gas permeability, simple film-making process and good toughness. and degradability

Active Publication Date: 2021-03-02
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, PLA films are mainly made of solid or semi-solid materials through extrusion, stretching, blow molding, etc. Since the forming medium does not have fluidity, the film-making process is more complicated, so it is necessary to provide a film-making process. Simple, and the prepared film has good toughness and degradability food-grade polylactic acid film preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method that the present embodiment provides utilizes glacial acetic acid to dissolve to prepare food-grade polylactic acid film comprises the following steps:

[0021] (1) Mixing: mix polylactic acid particles with glacial acetic acid with a purity of 99.5% according to the ratio of adding 1 gram of polylactic acid particles to 15 milliliters of glacial acetic acid, stir while mixing, and dissolve the lactic acid particles for 1 min during the stirring process to obtain a mixed solution ; The polylactic acid particle adopts the polylactic acid particle of model 4032D produced by Nature Works of the United States;

[0022] (2) Heat dissolving: place the mixed solution in a water bath constant temperature oscillator at 60°C for 10 minutes and shake to dissolve, so that the polylactic acid is completely dissolved to obtain a solution;

[0023] (3) Film formation: heat the glass plate to 25°C, and keep the temperature for a certain period of time, pour the solution on t...

Embodiment 2

[0028] The method that the present embodiment provides utilizes glacial acetic acid to dissolve to prepare food-grade polylactic acid film comprises the following steps:

[0029] (1) Mixing: mix polylactic acid particles with glacial acetic acid with a purity of 99.5% at a ratio of adding 1 gram of polylactic acid particles to 22 milliliters of glacial acetic acid, and stir while mixing to dissolve the lactic acid particles for 3 minutes during the stirring process to obtain a mixed solution ; The polylactic acid particle adopts the polylactic acid particle of model 4032D produced by Nature Works of the United States;

[0030] (2) Hot dissolving: Add tea polyphenols to the mixed solution, the amount of which is 35% of the mass of the polylactic acid particles, then place the mixed solution in a water bath constant temperature oscillator at 50°C for 20 minutes and shake to dissolve the polylactic acid completely. get solution;

[0031] (3) Film formation: Heat the glass plate ...

Embodiment 3

[0036] The method that the present embodiment provides utilizes glacial acetic acid to dissolve to prepare food-grade polylactic acid film comprises the following steps:

[0037] (1) Mixing: mix polylactic acid particles with glacial acetic acid with a purity of 99.5% at a ratio of adding 1 gram of polylactic acid particles to 30 milliliters of glacial acetic acid, stir while mixing, and dissolve the lactic acid particles for 5 minutes during the stirring process to obtain a mixed solution ; The polylactic acid particle adopts the polylactic acid particle of model 4032D produced by Nature Works of the United States;

[0038] (2) Heat dissolving: place the mixed solution in a water-bath constant temperature oscillator at 40°C and shake for 30 minutes to dissolve the polylactic acid completely to obtain a solution;

[0039] (3) Film formation: heat the stainless steel plate to 40°C and keep the temperature for a certain period of time, then apply a layer of vaseline on the stain...

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PUM

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Abstract

The invention discloses a method for preparing a food-grade polylactic acid film by dissolving with glacial acetic acid. The method uses food-grade glacial acetic acid to dissolve polylactic acid particles, and then pours the solution on a glass plate or a stainless steel plate to form a film. The film-making process of this method is simple, and the prepared polylactic acid film is food-grade, which not only has good toughness and degradability, but also has good gas permeability, and can be used as a fresh-keeping packaging material to prolong the life of chilled meat. , fruits and vegetables and other foods, its toughness is better than the existing plastic wrap.

Description

technical field [0001] The invention relates to a method for preparing a degradable polylactic acid film, in particular to a method for preparing a food-grade polylactic acid film by dissolving in glacial acetic acid. Background technique [0002] Polylactic acid (PLA) film is a new type of biodegradable material, which has the basic characteristics of biodegradable plastics and can be safely disposed of after use without producing any harmful substances. Compared with polyethylene (polyethylene, PE) film, PLA film has high film-forming properties, high transparency and high water vapor permeability, and has a wide range of raw material sources. In addition, PLA film also has the same printing properties as conventional film materials. [0003] At present, PLA films are mainly made of solid or semi-solid materials through extrusion, stretching, blow molding, etc. Since the forming medium does not have fluidity, the film-making process is more complicated, so it is necessary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J3/09B65D65/46C08L67/04
CPCY02W90/10Y02A40/90
Inventor 张崟张龙翼柯欢张鹏程叶浩龙刘达玉王卫赵黎明
Owner CHENGDU UNIV
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