A kind of preparation method of nano cellulose fiber dry powder

Abstract

The invention relates to a preparation method of nano-cellulose fiber dry powder, which comprises the following steps: 1) taking cellulose, pulverizing and drying to obtain cellulose raw material, which is ready for use; 2) mixing organic acid and alcohol to obtain a reaction liquid, and reacting The mass fraction of organic acid in the liquid is 20-30%. The reaction liquid is heated to 140-160° C., the cellulose raw material obtained in step 1) is added, kept warm and stirred; 3) After the cellulose raw material is fully destroyed and dispersed, the reaction system Carry out solid-liquid separation treatment to obtain reaction recovery liquid and solid powder, and after the solid powder is washed with alcohol, disperse into alcohol to obtain a solid powder dispersion; 4) Homogenize the solid powder dispersion obtained in step 3), Obtaining the nanocellulose fiber dispersion; 5) Evaporating to dryness the alcohol in the nanocellulose fiber dispersion in step 4) to obtain the nanocellulose fiber dry powder.

Description

technical field [0001] The invention relates to the field of cellulose treatment, in particular to a preparation method of nano-cellulose fiber dry powder. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of glucose. It is the most widely distributed and most abundant polysaccharide in nature. It is widely found in the metabolites of plants and some bacteria, and is a valuable natural renewable resource. [0003] In the microstructure of cellulose fibers, there are crystalline regions where macromolecules are arranged and stacked in an orderly manner and amorphous regions where macromolecules are stacked disorderly. Among them, the physical and chemical properties of the crystalline region are more stable. Thus, smaller sized cellulosic materials, ie nanocellulose materials, are obtained through the destruction of the amorphous regions. [0004] Cellulose materials at the nanoscale have special physical and chemical properties different fr...

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Problems solved by technology

The common point of these methods is that the water consumption in the preparation process is large, and the product produced is an aqueous dispersion of cellulose nanomaterials. The main disadvantages of the product are: easy to be contaminated by microorganisms, high requirements for storage temperature, and phase change easily occurs in long-term products. Settling, high transportation costs, application conditions are limited to water, and the product has the properties of colloid, so it has the same defect as colloid that it is easy to be destabilized by electrolyte

[0006] The existing nanocellulose material dry powder preparation technology or complex operation procedures, or the use of ionic liquid as a dispersant leads to high prices and strict requirements on reaction conditions, which is not conducive to cost control after large-scale production, and the use of solvents is highly toxic and harmful to the environment. more harmful

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