Method for preparing nano-crystal cellulose II by using basic anion-exchange resin

Abstract

The invention relates to a method for preparing nano-crystal cellulose II by using basic anion-exchange resin. The method comprises steps of: adding fibers and ion exchange resin into a solvent to obtain a suspension; performing agitation, ultrasound or microwave radiation processing to the suspension; then further performing the ultrasonic dispersion processing to filter out the ion exchange resin and obtain a fiber suspension after separation; and finally obtaining the nano-crystal cellulose II through further high-speed centrifugal purification to the fiber suspension. The invention takes basic anion-exchange resin as an alkaline catalyst that can dissociate OH- from the solution, overcomes disadvantages of liquid alkali reaction, can be used repeatedly, has little corrosion to equipment, excellent catalytic activity, wide temperature range for use, can work normally under different pH values, and has the advantages of slight degrade damage to the cellulose and less environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing nanocrystalline cellulose, and more particularly to a method for preparing nanocrystalline cellulose II by using an alkaline cation exchange resin. Background technique [0002] Cellulose is the most abundant natural polymer material in nature, and the development of renewable cellulose resources is of great strategic significance under the current situation. As a natural polymer compound, cellulose has limited strength and other deficiencies in its performance, which limits its application range. If it is prepared into nanomaterials, its properties can be optimized to a certain extent. Manipulating cellulose molecules and their supramolecular aggregates in the nanoscale range to design and assemble stable multiple patterns, thereby creating new nano-fine chemicals and new nano-materials with excellent functions, which has become the frontier field of cellulose science. Nano-scale crystalline cellulose a...

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Problems solved by technology

On the other hand, its biodegradability and renewability are unmatched by other materials.

[0003] At present, the preparation of nanocellulose crystals reported in the literature mainly adopts strong acid hydrolysis such as sulfuric acid, which is not easy to control the degree of cellulose degradation, and is more corrosive to equipment, and post-processing will produce a large amount of acidic waste liquid, causing great environmental pollution.