Preparation method of polylactic acid food packaging film with antibacterial property and one-way moisture resistance

A technology of food packaging film and polylactic acid film layer, applied in coating and other directions, can solve the problems of poor heat resistance of natural antibacterial agents, limited promotion and use, long crosslinking time, etc., and achieves high antibacterial activity, easy promotion, and slow migration. the effect

Pending Publication Date: 2022-05-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses expensive genipin as a cross-linking agent in the preparation of the gel film, and the cross-linking time is long (4-12h); the selected natural antibacterial agent has poor heat resista

Method used

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  • Preparation method of polylactic acid food packaging film with antibacterial property and one-way moisture resistance
  • Preparation method of polylactic acid food packaging film with antibacterial property and one-way moisture resistance
  • Preparation method of polylactic acid food packaging film with antibacterial property and one-way moisture resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of the polylactic acid film layer: Weigh 2g of polylactic acid and dissolve it in 100mL of chloroform solution, add 0.6g of glycerin as a plasticizer, stir to dissolve it completely, and ultrasonically degas to obtain a polylactic acid solution. Then pour it into a 20×20cm self-made glass plate, put it in a fume hood, and dry it at room temperature to obtain a polylactic acid film layer;

[0021] (2) Preparation of antibacterial gelatin gel solution: Weigh 2g of gelatin and disperse it in 100mL of water, stir and heat to 70°C to fully dissolve, then cool to 40°C, add 2mg of tannic acid and 1mg of ferric chloride, NaOH was used to adjust the pH value of the solution to 7.0, and continued to stir at 40° C. for 5 minutes to form a gel solution. Add 0.1 g of silver nitrate to the gel solution and stir at 40° C. for 30 minutes to obtain an antibacterial gelatin gel solution.

[0022] (3) Pour the antibacterial gelatin gel solution onto the surface of the poly...

Embodiment 2

[0024] (1) Preparation of polylactic acid film layer: Weigh 3g of polylactic acid and dissolve it in 100mL of chloroform solution, add 0.9g of glycerin as a plasticizer, stir to dissolve it completely, and ultrasonically degas to obtain a polylactic acid solution. Then pour it into a 20×20cm self-made glass plate, put it in a fume hood, and dry it at room temperature to obtain a polylactic acid film layer;

[0025] (2) Preparation of antibacterial gelatin gel solution: Weigh 3g of gelatin and disperse it in 100mL of water, stir and heat to 70°C to fully dissolve, then cool to 40°C, add 4mg of tannic acid and 2mg of ferric chloride, Use NaOH to adjust the pH value of the solution to 7.5, and continue stirring at 40°C for 5 minutes to form a gel solution, add 0.15g of silver nitrate to the gel solution, and stir at 40°C for 75 minutes to obtain an antibacterial gelatin gel solution;

[0026] (3) Pour the antibacterial gelatin gel solution onto the surface of the polylactic acid ...

Embodiment 3

[0028] (1) Preparation of polylactic acid film layer: Weigh 4g of polylactic acid and dissolve it in 100mL of chloroform solution, add 1.2g of glycerin as a plasticizer, stir to dissolve it completely, and ultrasonically degas to obtain a polylactic acid solution. Then pour it into a 20×20cm self-made glass plate, put it in a fume hood, and dry it at room temperature to obtain a polylactic acid film layer;

[0029] (2) Preparation of antibacterial gelatin gel solution: Weigh 4g of gelatin and disperse it in 100mL of water, stir and heat to 70°C to fully dissolve it, then cool to 40°C, add 6mg of tannic acid and 3mg of ferric chloride, Use NaOH to adjust the pH value of the solution to 8.0, and continue stirring at 40°C for 5 minutes to form a gel solution, add 0.2g of silver nitrate to the gel solution, and stir for 120 minutes at 40°C to obtain an antibacterial gelatin gel solution;

[0030] (3) Pour the antibacterial gelatin gel solution onto the surface of the polylactic ac...

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Abstract

The invention discloses a preparation method of a polylactic acid food packaging film with antibacterial and one-way moisture barrier properties, the packaging film is composed of a polylactic acid film layer and an antibacterial gelatin hydrogel film layer, a polylactic acid trichloromethane solution is prepared firstly, then glycerol is added as a plasticizer, stirring and degassing are performed, then the mixture is poured into a glass plate, and the antibacterial and one-way moisture barrier polylactic acid food packaging film is obtained. Naturally airing in a fuming cupboard to prepare a polylactic acid film layer; the preparation method comprises the following steps: adding tannic acid and ferric trichloride into a gelatin solution, regulating the pH value by adopting NaOH, stirring and crosslinking, and then adding AgNO3 to obtain an antibacterial gelatin gel solution; and pouring the antibacterial gelatin gel solution into the surface of the polylactic acid film, and drying to obtain the polylactic acid film with antibacterial and one-way moisture barrier properties. The prepared polylactic acid film has good moisture absorption, humidity regulation and durable antibacterial performance, meanwhile, the adopted preparation method is easy to operate and mild in condition, the used raw materials are wide, easy to obtain and low in price, and the polylactic acid film has wide application prospects in the field of food packaging.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a preparation method of a polylactic acid food packaging film with antibacterial and unidirectional moisture resistance properties. Background technique [0002] Food packaging is an important part of the food industry and plays an important role in protecting food quality. At present, most of the food packaging materials in the market are non-degradable petroleum-based plastics, and 90% of food packaging in my country will be discarded, and the white pollution caused by it is becoming more and more serious. With the promulgation of the national "Plastic Ban Order" in 2021 and the improvement of the public's awareness of environmental protection, research on the development of functional green and degradable new plastic packaging is imminent. [0003] Polylactic acid (PLA) is a biodegradable thermoplastic polyester synthesized primarily from lactic acid, ...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L67/04C08L89/00C08K5/1545C08K3/16C08K3/28C08K13/02
CPCC08J7/0427C08J2367/04C08J2489/00C08K5/1545C08K3/16C08K3/28C08K13/02
Inventor 李辉单鹏黎咏诗杨绕
Owner KUNMING UNIV OF SCI & TECH
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