Process for preparing water-soluble chitosan packing film

A technology of water-soluble chitosan and packaging film, which is applied in the field of preparation of water-soluble chitosan packaging film, can solve the problems of complex preparation process and achieve the effect of short preparation time

Inactive Publication Date: 2005-03-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is relatively complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 20g of chitosan raw material (deacetylation degree is 94%) in 1L of 2wt% acetic acid aqueous solution, add dropwise 25.4g of acetic anhydride under stirring at room temperature, after stirring for 1 hour, add the mixed solution dropwise to 1L of 0.5mol / l hydroxide In the potassium-ethanol solution, a flocculent precipitate is obtained, the precipitate is filtered out, washed with ethanol until neutral, and dried to obtain a 50% deacetylated chitosan product.

[0015] Dissolve 1g of 50% deacetylated chitosan in 100ml of aqueous solution to form a solution with a chitosan concentration of 1.0 wt%. The solution is poured on a polyethylene film and cast to form a film. The solvent is evaporated at room temperature and solidified into After the film, peel it off carefully, and let it dry naturally or dry to form a chitosan film.

[0016] Implementation effect: the chitosan film is neutral. When the thickness of the chitosan film is controlled to 0.05mm, it will be d...

Embodiment 2

[0018] Adopt the same method among the embodiment 1 to make 50% deacetylation degree chitosan product.

[0019] Add 1g of 50% deacetylated chitosan to 50ml of water, stir to dissolve and form a transparent solution, add 50ml of absolute ethanol, stir well, and make a solution with a chitosan concentration of 1.1wt%, and pour the solution on the polyethylene film Cast film on top, evaporate the solvent at room temperature, solidify to form a film, peel it off carefully, and let it dry naturally or dry to form a chitosan film.

[0020] Implementation effect: the chitosan film forms a film after drying at room temperature for 4 hours, and the chitosan film is neutral. When the thickness of the chitosan film is controlled to 0.05 mm, it dissolves in 20°C water within 1 minute, and dissolves faster in 80°C water , When the film thickness is adjusted to 0.1mm, it will be dissolved in 20°C water within 2 minutes.

Embodiment 3

[0022] Make 50% degree of deacetylation chitosan product with the same method among the embodiment 1.

[0023] Add 1g of 50% deacetylated chitosan into 50ml of water, stir to dissolve and form a transparent solution, add 50ml of acetone, stir evenly, and make a solution with a chitosan concentration of 1.1wt%, and pour the solution onto a polyethylene film for casting To form a film, evaporate the solvent at room temperature, solidify to form a film, peel it off carefully, and let it dry naturally or dry to form a chitosan film.

[0024] Implementation effect: the chitosan film forms a film after drying at room temperature for 4 hours, and the chitosan film is neutral. When the thickness of the chitosan film is controlled to 0.05 mm, it dissolves in 20°C water within 1 minute, and dissolves faster in 80°C water , When the film thickness is adjusted to 0.1mm, it will be dissolved in 20°C water within 2 minutes.

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PUM

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Abstract

The invention relates to a process for preparing water-soluble chitooligosacchrides packaging film by using water, water and ethanol, or water and acetone as solvent, at the condition of neutral pH, dissolving 50% deacetylated chitosan, and casting into films, wherein the edible compositions such as starch and sugar, water-soluble compositions such as polyvinyl alcohol can also be added.

Description

technical field [0001] The invention relates to a preparation method of a water-soluble chitosan packaging film. The chitosan film has the characteristics of water solubility and edibility, and can be used as a commercial lining film or packaging film. Background technique [0002] Chitin is a straight-chain polysaccharide in which N-acetyl-D-glucose is linked by β(1→4) glycosidic bonds. It is widely found in the cell walls of crustacean and arthropod heart bacteria, and is second only to cellulose in the earth. One of the richest organic compounds. Chitosan, the product of deacetylation treatment of chitin, has some unique physical and chemical properties and physiological functions due to the large number of free amino groups with high activity in its molecular structure. It is widely used in medicine, food, cosmetics, agriculture and environmental protection. It has broad application prospects, especially the chitosan biological health care products made of it have many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L5/08
Inventor 冯芳刘预赵斌元胡克鳌
Owner SHANGHAI JIAO TONG UNIV
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