Preparation method of chitosan preservative film

A technology of chitosan and plastic wrap, which is applied in the field of preparation of chitosan plastic wrap, can solve the problems of poor water resistance of plastic wrap, and achieve the effects of reduced water permeability, good biocompatibility, and long-term food preservation time

Active Publication Date: 2020-01-17
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of poor water resistance of chitosan preservative film, the present invention provides a preparation method of chitosan preservative film. Chit

Method used

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  • Preparation method of chitosan preservative film
  • Preparation method of chitosan preservative film

Examples

Experimental program
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Effect test

Example Embodiment

[0022] Example 1

[0023] (1) Dissolve 0.05 mol of chitosan with a degree of deacetylation of 85% in 500 mL of 1% acetic acid solution, add 0.05 mol of arabinose while stirring, react at 80 ℃ for 3 h, and cool to room temperature , Get product A;

[0024] (2) Mix 40 g of product A, 5 g of palm oil, 1 g of alkyl polyglucoside, 5 g of gum arabic and 20 g of modified starch to form mixture B, and put it into the shearing and dispersing machine at a rate of 12000 r / min Speed ​​shear dispersion for 20 min, then add 0.1 g of polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 1 h, and then stir at 300 r / min for 60 min to obtain product C;

[0025] (3) Product C is evenly coated on the acrylic board after natural cooling, and dried at 50 ℃ to form a film to obtain the product.

Example Embodiment

[0026] Example 2

[0027] (1) Dissolve 0.05 mol of chitosan with a degree of deacetylation of 85% in 200 mL of 2% acetic acid solution, add 0.1 mol of arabinose while stirring, react at 100 ℃ for 2 h, and cool to room temperature , Get product A;

[0028] (2) Mix 50 g of product A, 10 g of palm oil, 2 g of alkyl polyglucoside, 10 g of gum arabic and 15 g of modified starch to form mixture B, and put it into the shearing and dispersing machine at a rate of 16000 r / min Disperse at speed for 5 min, then add 0.3 g of polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 2 h, and then stir at 400 r / min for 40 min to obtain product C;

[0029] (3) Product C is evenly coated on acrylic board after natural cooling, and dried at 60 ℃ to form a film, then the product is obtained.

Example Embodiment

[0030] Example 3

[0031] (1) Dissolve 0.05 mol of chitosan with 92% deacetylation degree in 100 mL of 3% acetic acid solution, add 0.15 mol of arabinose while stirring, react at 120 ℃ for 1 h, and cool to room temperature , Get product A;

[0032] (2) Mix 60 g of product A, 15 g of palm oil, 3 g of alkyl polyglucoside, 8 g of gum arabic and 10 g of modified starch to form mixture B, and put it into the shearing dispersing machine at a rate of 14000 r / min Disperse at speed for 10 min, add 0.2 g of polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 1.5 h, and then stir at 600 r / min for 30 min to obtain product C;

[0033] (3) Product C is evenly coated on acrylic board after natural cooling, and dried at 55 ℃ to form a film, then the product is obtained.

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Abstract

The invention relates to the field of preservative film preparation. Aiming at a problem of poor water resistance of chitosan films, the invention provides a preparation method of a chitosan preservative film. The method comprises the following steps: 1, dissolving chitosan in an acetic acid solution, and adding arabinose for a reaction to obtain a product A; 2, dispersing a mixture comprising 40-60 parts of the product A, 5-15 parts of palm oil and 1-3 parts of an emulsifier by shearing, carrying out defoaming under reduced pressure, and carrying out stirring for 30-60 min; and 3, carrying out natural cooling, and coating a board with the mixture, and carrying out drying to form a film. According to the preparation method, the chitosan reacts with the arabinose first, wherein hydrophilicgroups of the chitosan is substituted, hydrophilicity is reduced, and the reaction produces a reducing product with an antioxidant effect; then the chitosan is compounded with palm oil, the palm oil and the chitosan form hydrogen bonds to weaken action between hydrophilic groups and water in the film, and thus water permeability of the film is reduced; and meanwhile, oil droplets are embedded intointerstitial space of chitosan molecules to block a part of pores, and then water absorption of the film is reduced, so that the improvement effect of the chitosan preservative film is higher than improvement effect of single use of arabinose or palm oil in hydrophobic performance of the film.

Description

technical field [0001] The invention relates to the field of preparation of preservative films, in particular to a preparation method of chitosan preservative films. Background technique [0002] The plastic wrap is generally covered on the surface of the food to isolate the food from the air, which can prevent the odor of various dishes in the refrigerator and keep the freshness of the dishes. The plastic wrap is easy to use and affordable, and can be used in microwave food heating, refrigerator food preservation, fresh and cooked food packaging, etc. It is widely used in family life, supermarket stores, hotels and restaurants and food packaging in industrial production. Most of the plastic wraps on the market are made of polyethylene. For example, Chinese Patent Publication No. CN109988354A, titled "A Kind of Fruit and Vegetable Antibacterial Preservative Film and Its Preparation Method", discloses a kind of fruit and vegetable antibacterial plastic wrap in the field of fr...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08L5/00C08L91/00C08L3/02
CPCC08J5/18C08J2305/08C08J2405/00C08J2491/00C08J2403/02
Inventor 刘宇姜维胡世伟李世杰
Owner ZHEJIANG OCEAN UNIV
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