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A kind of preparation method and application of chitin nanofiber

A technology of nanofibers and chitin, which is applied in the field of preparation of chitin nanofibers, can solve the problems of uncontrollable and unadjustable charging properties of chitin fibers, etc., and achieve good particle charging performance, mild preparation conditions, and particle size The effect of uniform diameter

Active Publication Date: 2021-09-17
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention proposes a preparation method and application of chitin nanofibers, which solves the technical problems that the existing chitin fiber length and charging properties are uncontrollable and unadjustable

Method used

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  • A kind of preparation method and application of chitin nanofiber
  • A kind of preparation method and application of chitin nanofiber
  • A kind of preparation method and application of chitin nanofiber

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Embodiment 1

[0041] The invention provides a preparation method of chitin nanofibers, the steps are as follows:

[0042] (1) Prepare 50mL of 1 mol / L inorganic acid solution, heat it in a water bath or an oil bath at 50°C, add 1g of chitin powder, and stir at a low speed for 2 hours until fully acidified to obtain an acid solution suspension;

[0043] (2) The acid solution suspension prepared in step (1) was centrifuged at high speed, and the precipitate was washed twice with water and then redispersed in 50 mL of water to obtain a dispersion;

[0044] (3) Ultrasonic crush the dispersion liquid. The corresponding ultrasonic crushing conditions for every 100g of dispersion liquid are: ultrasonic crushing power is 200 W, ultrasonic crushing frequency is 20KHz, ultrasonic crushing time is 30min, and the temperature of the dispersion liquid is maintained at 0°C during ultrasonication , to obtain chitin nanofiber aqueous suspension.

[0045] figure 2 It is the measured particle size and parti...

Embodiment 2

[0048] The invention provides a preparation method of chitin nanofibers, the steps are as follows:

[0049] (1) Prepare 100mL of 2 mol / L inorganic acid solution, heat it in a water bath or oil bath at 60°C, add 1g of chitin powder, and stir at a low speed for 3 hours until it is fully acidified to obtain an acid solution suspension;

[0050] (2) The acid solution suspension prepared in step (1) was centrifuged at high speed, and the precipitate was washed once with water and redispersed in 100 mL of water to obtain a dispersion;

[0051] (3) Ultrasonic crush the dispersion liquid. The corresponding ultrasonic crushing conditions for every 100g of dispersion liquid are: ultrasonic crushing power is 200 W, ultrasonic crushing frequency is 20KHz, ultrasonic crushing time is 30min, and the temperature of the dispersion liquid is maintained at 0°C during ultrasonication , to get chitin nanofibers.

[0052] figure 1 It is the transmission electron microscope image of the chitin na...

Embodiment 3

[0056] The invention provides a preparation method of chitin nanofibers, the steps are as follows:

[0057] (1) Prepare 200mL of 3 mol / L inorganic acid solution, heat it in a water bath or oil bath at 70°C, add 1g of chitin powder, and stir at a low speed for 5 hours until fully acidified to obtain an acid solution suspension;

[0058] (2) The acid solution suspension prepared in step (1) was centrifuged at high speed, and the precipitate was washed twice with water and redispersed in 200 mL of water to obtain a dispersion;

[0059] (3) Ultrasonic crush the dispersion liquid. The corresponding ultrasonic crushing conditions for each 100g dispersion liquid are: ultrasonic crushing power is 400 W, ultrasonic crushing frequency is 25KHz, ultrasonic crushing time is 40min, and the temperature of the dispersion liquid is maintained at 0°C during ultrasonication , to obtain chitin nanofiber aqueous suspension.

[0060] Figure 4 It is the measured particle size and particle size d...

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Abstract

The invention belongs to the field of preparation of new materials, in particular to a preparation method and application of chitin nanofibers. After diluting with concentrated acid, add chitin powder raw material, after heating and acidolysis once, centrifuge, wash and resuspend the precipitate, after ultrasonic treatment, the aqueous dispersion of chitin nanofibers can be obtained, and solid powder can also be obtained by freeze-drying. The invention decomposes the chitin raw material into microfibers under acid liquid, and then decomposes them into nanofibers through ultrasonic crushing. The preparation method is simple, gentle, efficient and controllable, reducing the amount of acid solution and the energy consumption of the preparation. At the same time, the nanofibers are uniform, have good dispersibility and suspension, high charging performance, and have remarkable characteristics of nanomaterials. The invention realizes the controllable adjustment of the chitin nanofiber size by adjusting the ultrasonic crushing condition; and realizes the controllable adjustment of the chitin nanofiber surface electric quantity by adjusting the temperature and the acid hydrolysis ratio.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, in particular to a preparation method and application of chitin nanofibers. Background technique [0002] Chitin is the only positively charged natural polymer in nature, widely present in the exoskeleton of crustaceans, tissues and organs of molluscs and cell walls of fungi, etc. Chitin exists in the form of fibers, and the structural units N-acetylglucosamine are connected by hydrogen bonds, with three configurations of α, β, and γ. Among them, the α-configuration chitin is the most common, with high crystallinity and stable physical properties, and is derived from shrimp shells. Chitin is non-toxic, biodegradable and biocompatible. It can improve plant growth, induce plant resistance, and increase crop yield. It is used in crop pest control, seed coating, and fruit and vegetable preservation. At present, in biomedicine, nanoscale chitin particles have large specific surface area a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/00C08B37/08A01N61/00A01P1/00A01P3/00A01P7/00A61K47/36B82Y40/00
CPCA01N61/00A61K47/36B82Y40/00C08B37/003D01F9/00
Inventor 李振亚尹新明苏丽娟王合中安世恒宋南魏纪珍刘润强
Owner HENAN AGRICULTURAL UNIVERSITY