Chitosan film and preparation method thereof

A technology of chitosan and film, applied in the direction of paper, etc., can solve the problems of long spinning process route, low output, high production cost, etc., and achieve the effect of environmental friendliness, low cost and good dialysis performance

Inactive Publication Date: 2012-09-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The wet spinning method of chitosan fiber is the most widely used and the most traditional spinning method. The whole spinning process route is too lengthy and the production cost is very high; although the electrospinning method can obtain superfine fibers, the output is extremely Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of titration neutralization preparation method of chitosan film, comprises the following steps:

[0033](1) Preparation of chitosan slurry: putting chitosan powder in an aqueous acetic acid solution with a concentration of 2 (V / V)% to dissolve chitosan slurry, the content of chitosan in the chitosan slurry is 0.1(W / W)%;

[0034] (2) Preparation of chitosan coagulation solution: put sodium hydroxide, urea and zinc acetate in deionized water and stir evenly to make chitosan coagulation solution; in the chitosan coagulation solution, the concentration of sodium hydroxide is 4( W / W)%, urea concentration is 0.5(W / W)%, zinc acetate concentration is 0.1(W / W)%;

[0035] (3) Neutralization titration: Add chitosan coagulation solution dropwise to the chitosan slurry under stirring at a rotating speed of 100rpm at a rate of 0.5 ml / min, while continuously measuring the pH value of the chitosan slurry;

[0036] (4) Chitosan is solidified and formed: as the dripping proceeds...

Embodiment 2

[0040] A kind of titration neutralization preparation method of chitosan film, comprises the following steps:

[0041] (1) Preparation of chitosan slurry: putting chitosan powder into 6 (V / V)% acetic acid aqueous solution to dissolve chitosan slurry, the content of chitosan in the chitosan slurry is 1.0(W / W)%;

[0042] (2) Preparation of chitosan coagulation solution: put sodium hydroxide, urea and zinc acetate in deionized water and stir to make chitosan coagulation solution; in the chitosan coagulation solution, the concentration of sodium hydroxide is 10( W / W)%, urea concentration is 1.0(W / W)%, zinc acetate concentration is 0.5(W / W)%;

[0043] (3) Neutralization titration: Add chitosan coagulation liquid dropwise to the chitosan slurry under stirring at a rotating speed of 1000 rpm at a rate of 5.0 ml / min, while continuously measuring the pH value of the chitosan slurry;

[0044] (4) Chitosan is solidified and formed: as the dripping proceeds, chitosan is continuously pre...

Embodiment 3

[0048] A kind of titration neutralization preparation method of chitosan film, comprises the following steps:

[0049] (1) Preparation of chitosan slurry: putting chitosan powder in 4 (V / V)% aqueous acetic acid solution to dissolve chitosan slurry, the content of chitosan in the chitosan slurry is 0.5(W / W)%;

[0050] (2) Preparation of chitosan coagulation solution: Put sodium hydroxide, urea and zinc acetate in deionized water and stir to make chitosan coagulation solution; in the chitosan coagulation solution, the concentration of sodium hydroxide is 7( W / W)%, urea concentration is 0.7(W / W)%, zinc acetate concentration is 0.3(W / W)%;

[0051] (3) Neutralization titration: Add chitosan coagulation solution dropwise to the chitosan slurry under stirring at a rotating speed of 500rpm at a rate of 2.5 ml / min, while continuously measuring the pH value of the chitosan slurry;

[0052] (4) Chitosan is solidified and formed: as the dripping proceeds, chitosan is continuously precip...

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PUM

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Abstract

The invention relates to a chitosan film prepared by means of neutralization titration and a preparation method thereof. The film is of a film structure formed by flocculation and aggregation of chitosan. The preparation method includes the steps: firstly, putting chitosan raw materials in an appropriate quantity into acetic acid aqueous solution so that chitosan solution is prepared; secondly, putting sodium hydroxide, urea and zinc acetate into deionized water with uniform stirring so that chitosan solidification liquid is prepared; thirdly, dropwise adding the solidification liquid into the chitosan solution with high-speed stirring; fourthly, precipitating the chitosan continuously in a flocculating manner along with dropwise adding, and stopping dropwise adding until a pH (potential of hydrogen) value is increased to the range from 6.5 to 7.5; fifthly, catching flocculation with a stainless steel filter screen so as to obtain the film formed by flocculation and aggregation of the chitosan; and sixthly, cleaning the film with the deionized water and naturally drying so that the chitosan film is obtained. The chitosan film is excellent in permeability and can be used as an auxiliary material for wound surfaces of burns and scalds.

Description

technical field [0001] The invention relates to a chitosan film and a preparation method thereof, in particular to a chitosan film prepared by a titration neutralization method and a preparation method thereof. Background technique [0002] Chitosan is the product of N-deacetylation of chitin, and its chemical name is β-(1→4)-2-amino-2-deoxy-D-glucose. Pure chitosan is a white translucent, tasteless, odorless, non-toxic, powdery solid with a slight pearl luster, which can undergo hydrolysis, alkylation, acylation, carboxymethylation, sulfonation, and nitration under certain conditions , Halogenation, oxidation, reduction, condensation and complexation and other chemical reactions can generate chitosan derivatives with different properties, which expands the application range of chitosan. [0003] Chitosan has good physiological activity, can inhibit bacterial activity, activate body system, absorb and excrete heavy metals, maintain immune effect and solubility, etc. Chitos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/30
Inventor 杨庆刘畅杜盼郯志清沈新元吉亚丽吴文华
Owner DONGHUA UNIV
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