Preparation method of chitin film

A technology of chitin and urea, which is applied in the field of chitin film preparation, achieves the effect of cheap price, simple process and good biocompatibility

Inactive Publication Date: 2010-10-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are few reports on solvents that directly dissolve chitin, and the preparation of chitin films by purely physical methods is still being explored.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 2 grams of chitin (weight average molecular weight M w =2.5×10 5 ) into 98 grams of mixed aqueous solution containing 8wt% NaOH and 4wt% urea, stirred evenly, and after freezing at -20°C for 12 hours, took out and thawed to obtain a transparent chitin solution with a concentration of 2wt%. The chitin solution was cast, gelled at 30°C for 2 hours, and the residual sodium hydroxide and urea in the gel were washed away with distilled water to obtain a chitin wet film. After drying, the chitin film was obtained, and its mechanical strength was 88 MPa, elongation at break 7%.

Embodiment 2

[0019] 1.5 grams of chitin (weight average molecular weight M w =2.5×10 5 ) into 98.5 grams of mixed aqueous solution containing 10wt% NaOH and 14wt% urea, stirred evenly, and after freezing at -13°C for 24 hours, took out and thawed to obtain a transparent chitin solution with a concentration of 1.5wt% . Cast the chitin solution, gel it at 30°C for 8 hours, remove the residual sodium hydroxide and urea in the gel with distilled water to obtain a chitin wet film, soak it in 1wt% glycerin aqueous solution, and dry it A glycerin-plasticized chitin film CF1 was obtained, with a mechanical property of 49 MPa and an elongation at break of 12%.

Embodiment 3

[0021] 3 grams of chitin (weight average molecular weight M w =2.5×10 5 ) into 97.0 grams of mixed aqueous solution containing 10wt% NaOH and 10wt% urea, stirred evenly, and after freezing at -20°C for 6 hours, took out and thawed to obtain a transparent chitin solution with a concentration of 3wt%. Cast the chitin solution, gel it at 40°C for 2 hours, remove the residual sodium hydroxide and urea in the gel with distilled water to obtain a chitin wet film, soak it in 2wt% glycerin aqueous solution, and dry it A glycerin-plasticized chitin film CF2 was obtained, with a mechanical property of 55 MPa and an elongation at break of 34%.

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Abstract

The invention relates to a preparation method of chitin film. Chitin is added into combined aqueous solution containing NaOH and urea, the aqueous solution is frozen at low temperature, and unfreezing and stirring to be uniform are carried out, thus obtaining chitin solution. The chitin solution is cast on a glass plate and is subject to high temperature gelation, water is used for washing away residual NaOH and urea in film, so as to obtain chitin wet film, and drying is carried out, thus obtaining the chitin film. Glycerine is taken as plasticizer, so as to obtain the glycerine plasticized chitin film. In the invention, dissolution of chitin, gelation, film-forming and plasticizing are all physical processes, and no chemical reaction is taken place. The film can effectively absorb heavy metal ion and has favourable mechanical properties. The method of the invention is simple, operation is convenient, and no pollution to the environment is produced. The chitin film can have wide application prospect in the fields of tissue engineering support material and sewage treatment.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a chitin film. Background technique [0002] Chitin is a natural macromolecule second only to cellulose in nature, but there are many problems in its direct utilization. The main reason is that it is insoluble in common solvents, so it must be deacetylated into chitosan under concentrated alkali conditions before it can be used. Therefore, the development and production of chitin materials are mainly carried out with chitosan as raw material. Chitosan is obtained by deacetylating chitin, which greatly increases the cost of industrialization. In this way, not only the process is complicated, but the cost is high and the concentrated alkali will cause environmental pollution. It is of great strategic significance and economic interest to develop a new process for preparing materials by directly dissolving chitin solvents. In addition, chitin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08J5/18C08J7/00C08L5/08
Inventor 张俐娜常春雨段博
Owner WUHAN UNIV
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