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Micro-nano cellulose and preparation method thereof

A technology of micro-nano cellulose and cellulose, which is applied in the field of materials, can solve the problems of complex operation, large equipment corrosion, and a large amount of acid waste liquid, and achieve the effects of mild reaction conditions, low equipment corrosion, and small degradation damage

Active Publication Date: 2013-06-19
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods of cellulose need to be pretreated, the method is complicated, and the strong acid hydrolysis method is used, which is not easy to control the degree of cellulose degradation, and it is more corrosive to the equipment. After treatment, a large amount of acid waste liquid will be generated, which will cause great environmental pollution.
[0008] The existing micro-nano cellulose preparation technology is complicated and not universal, and it is mainly prepared by degrading cellulose with strong oxidizing reagents. It is large, and the operation is complicated, and the post-processing will produce a large amount of waste liquid, which will cause great pollution to the environment

Method used

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  • Micro-nano cellulose and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Take by weighing 2g microcrystalline cellulose, join the ZnCl of 30g mass fraction 60% ２ —In glycerin solution, 175°C oil bath for 4h to obtain cellulose / ZnCl ２ / glycerin mixture. Add 700 mL of distilled water to the cellulose / ZnCl ２ Glycerin / glycerin mixture, centrifuge and layer (centrifuge at 10,000 rpm, 15 min each time), remove the upper layer solution, and remove the lower layer of cellulose jelly to obtain micro-nano cellulose. It can be seen from the observation of the transmission electron microscope that the micro-nanocellulose prepared by this method has a diameter of about 10-20nm and a length of about 200nm, and has a rod-like and network-like structure, such as figure 1 shown.

Embodiment 2

[0026] Weigh 2g of chemical pulp, add to 30g of ZnCl with a mass fraction of 0.1% ２ —In glycerin solution, 240°C oil bath for 8h to obtain cellulose / ZnCl ２ / glycerin mixture. Add 700 mL of distilled water to the cellulose / ZnCl ２ Glycerin / glycerol mixture, centrifuge and layer (centrifuge at 5000 rpm, 10 min each time), remove the upper layer solution, and obtain micro-nano cellulose from the lower layer of cellulose jelly.

Embodiment 3

[0028] Weigh 0.5g absorbent cotton and add to 10g FeCl with a mass fraction of 60%. 3 —Glycerol-ethylene glycol solution (the mass ratio of glycerol and ethylene glycol is 1:1), oil bath at 100°C for 1h, to obtain cellulose / FeCl 3 / glycerin / glycol mixture. Add 700 mL of distilled water to the cellulose / FeCl 3 / glycerol / ethylene glycol mixture, centrifuge and layer (centrifuge at 5,000 rpm, 10 min each time), remove the upper layer solution, and remove the lower layer of cellulose jelly to obtain micro-nano cellulose.

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Abstract

The invention discloses micro-nano cellulose and a preparation method thereof. Cellulose is reacted with a metal salt high-boiling point alcoholic solution, thereby obtaining the micro-nano cellulose. According to the preparation method, the usage of metal salt is less, the reaction condition is mild, the cellulose degradation loss is less, the equipment corrosive substance is small, the operation is simple and the yield is high. An amorphous area of the cellulose is degraded after being treated with the metal salt alcoholic solution, the degree of polymerization of the cellulose is reduced, the degree of crystallization is greatly increased, and meanwhile, the specific surface area and the chemical activity of the cellulose are increased. The obtained micro-nano cellulose is bar-shaped, has a net structure, is excellent in mechanical strength and is beneficial to the application of the cellulose in a compound material.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a micro-nano cellulose and a preparation method thereof, in particular to a method for preparing micro-nano cellulose by using a metal salt-high boiling point alcohol solution. Background technique [0002] Cellulose is the most abundant, renewable and biodegradable natural polymer in the world. Nature can provide about 150 billion tons of cellulose every year, and it is an inexhaustible renewable resource in nature. The use of its performance improvement and high added value has become a research hotspot at home and abroad. Cellulose can be degraded by acid hydrolysis, enzyme treatment and mechanical method to produce micro-nano cellulose. Micro-nanocellulose has many excellent properties, such as high purity, high degree of polymerization, high crystallinity, high hydrophilicity, high Young's modulus, high strength, ultra-fine structure and high transparency, etc. In view of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B1/00C08B15/00
Inventor 黄彪欧文林雯怡陈学榕唐丽荣陈燕丹卢麒麟陈翠霞
Owner FUJIAN AGRI & FORESTRY UNIV
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