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Tear-resistant and degradable polylactic acid food packaging film and preparation method thereof

A technology of food packaging film and polylactic acid, applied in the field of packaging materials, can solve the problems of high brittleness of polylactic acid, low tear strength, limited application of polylactic acid film, etc., to improve tear strength, expand application range, and good degradation ability. Effect

Active Publication Date: 2021-07-30
上海经海纬象生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the polylactic acid material used as a packaging film has the above advantages, due to the high brittleness of polylactic acid, the tear strength of the film is low, which limits the application of polylactic acid film in the packaging field.

Method used

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  • Tear-resistant and degradable polylactic acid food packaging film and preparation method thereof
  • Tear-resistant and degradable polylactic acid food packaging film and preparation method thereof
  • Tear-resistant and degradable polylactic acid food packaging film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add menthol lactone monomer to toluene, then add glycerol, diethyl zinc, and urea, stir for 10 minutes, heat to 75°C for 13 hours under the protection of nitrogen, then drop glacial acetic acid to terminate the reaction, and Unreacted monomers and catalysts are removed by ice methanol precipitation at -20°C, and finally centrifuged to obtain hydroxyl-terminated star polymenthol lactone; among them, menthol lactone, toluene, glycerol, diethyl zinc, urea The mass ratio of glacial acetic acid and glacial methanol is 28:100:0.22:1.2:0.5:0.02:800;

[0032] (2) Add hydroxyl-terminated star polymenthol lactone into toluene, then add succinic acid and zirconia, stir for 20 minutes, heat to 100°C for 10 hours under the protection of nitrogen, and then rotary evaporate to remove toluene to obtain carboxyl-terminated star Type polymenthol lactone; wherein, the mass ratio of hydroxyl-terminated star polymenthol lactone, toluene, succinic acid, and zirconia is 28:100:6:0.4;

[...

Embodiment 2

[0037] (1) Add menthol lactone monomer to toluene, then add glycerol, diethyl zinc, and urea, stir for 20 minutes, heat to 65°C for 15 hours under nitrogen protection, then drop glacial acetic acid to terminate the reaction, and Unreacted monomers and catalysts are removed by ice methanol precipitation at -20°C, and finally centrifuged to obtain hydroxyl-terminated star polymenthol lactone; among them, menthol lactone, toluene, glycerol, diethyl zinc, urea The mass ratio of glacial acetic acid and glacial methanol is 32:100:0.15:1.5:0.5:0.02:600;

[0038] (2) Add hydroxyl-terminated star polymenthol lactone into toluene, then add succinic acid and zirconia, stir for 10 minutes, heat to 105°C for 8 hours under nitrogen protection, and then rotary evaporate to remove toluene to obtain carboxyl-terminated star Type polymenthol lactone; wherein, the mass ratio of hydroxyl-terminated star polymenthol lactone, toluene, succinic acid, and zirconia is 32:100:6:0.8;

[0039] (3) Add c...

Embodiment 3

[0043] (1) Add menthol lactone monomer to toluene, then add glycerol, diethyl zinc, and urea, stir for 12 minutes, heat to 70°C for 14 hours under the protection of nitrogen, then drop glacial acetic acid to terminate the reaction, and Unreacted monomers and catalysts are removed by ice methanol precipitation at -20°C, and finally centrifuged to obtain hydroxyl-terminated star polymenthol lactone; among them, menthol lactone, toluene, glycerol, diethyl zinc, urea The mass ratio of glacial acetic acid and glacial methanol is 30:100:0.2:1.4:0.4:0.025:700;

[0044] (2) Add hydroxyl-terminated star polymenthol lactone to toluene, then add succinic acid and zirconia, stir for 15 minutes, heat to 102°C for 9 hours under nitrogen protection, and then rotary evaporate to remove toluene to obtain carboxyl-terminated star Type polymenthol lactone; wherein, the mass ratio of hydroxyl-terminated star polymenthol lactone, toluene, succinic acid, and zirconia is 30:100:5:0.5;

[0045] (3) ...

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Abstract

The invention relates to the technical field of packaging materials, and provides a tear-resistant and degradable polylactic acid food packaging film and a preparation method thereof. The polylactic acid food packaging film is composed of polylactic acid and composite cross-linked particles. The composite cross-linked particle is of a core-shell structure, wherein a core layer is a nano silicon dioxide particle, and a shell layer is a polymenthol lactone elastomer in which chitin nano whiskers are uniformly distributed. In the shell layer of the composite cross-linked particle, the polymenthol lactone forms a cross-linked network structure, and the chitin nano whiskers are used as cross-linking points of the network structure. The chitin nano crystal whiskers are nano crystal whiskers which have few defects and high strength and are obtained after chitin is hydrolyzed to remove an amorphous region and a low-order region. The shell layer and the core layer are well combined through chemical bonds. The composite cross-linked particles are added into the polylactic acid, so that the tearing strength of the polylactic acid packaging film can be obviously improved, and the packaging film has good degradation capacity.

Description

technical field [0001] The invention belongs to the technical field of packaging materials and provides a tear-resistant and degradable polylactic acid food packaging film and a preparation method. Background technique [0002] Food packaging is to maintain the quality of food, prevent food from deteriorating during storage, distribution, and sales, prevent microbial contamination, and prevent superchemical and physical changes. Therefore, the development of food packaging materials is of great significance. With the widespread application of plastics, food packaging materials have gradually changed from paper, bamboo, wood, etc. to plastic films. Food packaging films have the advantages of good barrier properties, easy processing, light weight, and low price, and have become popular in the food industry and daily life. It is widely used in food packaging materials. [0003] Although food packaging films have many advantages, most plastic films will be discarded after use. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L5/08C08K9/10C08K3/36C08J5/18B65D65/46
CPCC08J5/18B65D65/466C08J2367/04C08J2467/04C08J2405/08C08K3/36Y02W90/10Y02A40/90
Inventor 韩群
Owner 上海经海纬象生物材料有限公司
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