A kind of preparation method of chitosan nanofiber

A technology of chitosan nanometer and chitosan solution, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of easy introduction of other impurities, poor dispersion stability, and limited application, so as to improve product quality, Guarantee product quality and use quality, and the effect of expanding the application range

Active Publication Date: 2020-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has low production cost, mature technology and equipment, and can prepare nano-chitosan in fiber form, its dispersion stability is not good, and other impurities are easily introduced during the preparation of nano-chitosan fibers prepared by this method, which makes its application difficult. limit

Method used

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  • A kind of preparation method of chitosan nanofiber
  • A kind of preparation method of chitosan nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Prepare 100ml of 1% acetic acid solution, add 1g of chitosan with a molecular weight of 50,000 and a degree of deacetylation of 90% to the acetic acid solution at 50°C and continue stirring until the chitosan is completely dissolved. Chitosan solution;

[0033] 2) Prepare 10ml of hydrogen peroxide solution with a mass fraction of 6%, add the hydrogen peroxide solution dropwise under the stirring condition of the chitosan solution, control the dropping time within half an hour, then continue to stir for 2h, then let it stand and cool to room temperature naturally to obtain A suspension containing degradation product A;

[0034] 3) Prepare 30ml of 1mol / L sodium hydroxide aqueous solution, slowly add it dropwise to the suspension of step 2), adjust its pH to neutral, collect the filter cake by suction, and repeat the filter cake with deionized water Wash to neutral to obtain degradation product B;

[0035] 4) Disperse the degradation product B in deionized water and stir it ...

Embodiment 2

[0038] 1) Prepare 100ml of 3% acetic acid solution, add 1g of chitosan with a molecular weight of 100,000 and a degree of deacetylation of 95% to the acetic acid solution at 55°C, and continue stirring until the chitosan is completely dissolved. Chitosan solution;

[0039] 2) Prepare 10ml of a hydrogen peroxide solution with a mass fraction of 3%, add the hydrogen peroxide solution dropwise under the stirring condition of the chitosan solution, control the dropping time within half an hour, and then continue to stir for 6 hours, then let it stand and cool to room temperature naturally to obtain A suspension containing degradation product A;

[0040] 3) Prepare 30ml of 2mol / L sodium hydroxide aqueous solution, slowly add it dropwise to the suspension of step 2), adjust its pH to neutral, collect the filter cake by suction, and repeat the filter cake with deionized water Wash to neutral to obtain degradation product B;

[0041] 4) Disperse the degradation product B in deionized water...

Embodiment 3

[0044] 1) Prepare 100ml of acetic acid solution with a mass fraction of 5%, add 3g of chitosan with a molecular weight of 200,000 and a degree of deacetylation of 80% to the acetic acid solution at 40°C, and continue stirring until the chitosan is completely dissolved. Chitosan solution;

[0045] 2) Prepare 10ml of hydrogen peroxide solution with a mass fraction of 6%, add the hydrogen peroxide solution dropwise under the stirring condition of the chitosan solution, control the dropping time within half an hour, and then continue to stir for 4 hours, then let it stand and cool to room temperature naturally to obtain A suspension containing degradation product A;

[0046] 3) Prepare 30ml sodium hydroxide aqueous solution with a concentration of 3mol / L, slowly add it dropwise to the suspension of step 2), adjust its pH to neutral, collect the filter cake by suction, and repeat the filter cake with deionized water Wash to neutral to obtain degradation product B;

[0047] 4) Disperse t...

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Abstract

The invention relates to a preparation method of a chitosan nanofiber. Through a chemical-physical cooperation function of homogeneity of hydrogen peroxide and a homogenizer, firstly, chitosan with certain molecular weight and deacetylation degree is added to an acid solution for dissolution, at a certain temperature, degradation treatment is conducted with hydrogen peroxide, the degraded chitosanwith low molecular weight is obtained, and finally the degraded chitosan is degraded and subjected to high-pressure homogeneous treatment so that the nano chitosan fiber can be prepared. Through a test, the prepared chitosan fiber is in a nano scale, the diameter of the prepared chitosan nanofiber is 15-40 nanometers, and the length of the prepared chitosan nanofiber is 200-1,000 nanometers; thechitosan nanofiber can be evenly dispersed in water and ethyl alcohol for a long time, agglomeration hardly occurs, it is tested that the zeta of a prepared chitosan nanofiber suspension solution is 34-41 mV, after the prepared chitosan nanofiber suspension solution is placed for two months, the zeta potential of the prepared chitosan nanofiber suspension solution still reaches 32-36 mV, and it isexpressed that the stability is good. The method is easy to implement, mild in condition, environmentally friendly, safe and low in cost, provides convenience for industrial production and has wide application prospects in the fields of biomedicine application, biosensors, adsorbents, tissue engineering, membrane materials and new energy materials.

Description

Technical field [0001] The invention relates to the application field of chitosan, in particular to a method for preparing chitosan nanofibers. Background technique [0002] Chitosan is a product of deacetylation of chitin, a renewable resource widely found in animals and plants. Chitosan has many unique properties, such as hydrophilicity, biocompatibility, biodegradability, antibacterial, non-toxic, and anticoagulant properties. It is the only natural polysaccharide with positive charge found so far. The molecular structure of chitosan contains hydroxyl, amino and other groups, which can be easily prepared into derivatives with different properties through chemical modification. It can be widely used in tissue engineering, biomedicine, adsorbents, membrane materials, new energy materials and other fields. [0003] Nano-chitosan material is a material with nano-scale prepared by physical and chemical methods with chitosan as raw material. Compared with nano-microspheres, nano-chit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/00
CPCD01F9/00
Inventor 邵自强陈垦刘建新王波张璐王文俊王飞俊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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