Method using ester solvent to perform dissolving to prepare food-grade polylactic acid film

A technology of ester solvent and polylactic acid is applied in the field of preparing degradable polylactic acid film, which can solve the problems of lack of fluidity of forming medium and complicated film-making process, and achieve good gas permeability, simple and good film-making process. The effect of food safety

Inactive Publication Date: 2019-05-31
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 pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for preparing a food-grade polylactic acid film by dissolving an ester solvent provided in this embodiment comprises the following steps:

[0021] (1) Mixing: mix polylactic acid particles with ethyl acetate solvent with a purity of 99.5% according to the ratio of adding 1 gram of polylactic acid particles to 15 milliliters of ethyl acetate solvent, stir while mixing, and dissolve the lactic acid particles for 1 min during the stirring process , to obtain a mixed liquor; the polylactic acid particles adopting the model of 4032D produced by Nature Works of the U.S.;

[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 the glass plate, and spread it evenly;

[...

Embodiment 2

[0028] The method for preparing a food-grade polylactic acid film by dissolving an ester solvent provided in this embodiment comprises the following steps:

[0029] (1) Mixing: mix polylactic acid particles with methyl acetate solvent with a purity of 99% according to the ratio of 1 gram of polylactic acid particles to 22 milliliters of methyl acetate solvent, and stir while mixing to dissolve the lactic acid particles for 3 minutes during the stirring process , to obtain a mixed liquor; the polylactic acid particles adopting the model of 4032D produced by Nature Works of the U.S.;

[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 to 32°C and keep the temperature for ...

Embodiment 3

[0036] The method for preparing a food-grade polylactic acid film by dissolving an ester solvent provided in this embodiment comprises the following steps:

[0037] (1) Mixing: mix polylactic acid particles with ethyl formate solvent with a purity of 98% according to the ratio of adding 1 gram of polylactic acid particles to 30 ml of ethyl formate solvent, stir while mixing, and dissolve the lactic acid particles for 5 minutes during the stirring process , to obtain a mixed liquor; the polylactic acid particles adopting the model of 4032D produced by Nature Works of the U.S.;

[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 stainless steel plate, then pour the solution ...

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Abstract

The invention discloses a method using ester solvent to perform dissolving to prepare a food-grade polylactic acid film. The method is characterized in that a food-grade ethyl formate, methyl acetateor ethyl acetate solvent is used to dissolve polylactic acid particles to obtain a solution, and the solution is poured onto a glass plate or a stainless steel plate to form the film. The method has the advantages that the method is simple in film preparation process, the prepared food-grade polylactic acid film is good in toughness and degradability, good in gas permeability and capable of beingused as a fresh-keeping packaging material used for prolonging the storage life of food such as chilled meat and fruits and vegetables, and the toughness of the food-grade polylactic acid film is better than 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 an ester solvent. 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 to...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L67/04
Inventor 张崟张龙翼柯欢张鹏程陈婷婷刘达玉王卫赵黎明
Owner CHENGDU UNIV
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