Preparation method of nano-cellulose fiber dry powder

Abstract

The invention relates to a preparation method of nano-cellulose fiber dry powders which comprises the following steps: 1) taking, pulverizing and drying cellulose to obtain a cellulose raw material for later use; 2) mixing organic acid with alcohol to obtain reaction liquid in which the organic acid takes up 20-30% by mass, heating the reaction liquid to 140 to 160 DEG C, adding the cellulose rawmaterial obtained in step (1), preserving heat and mixing; 3) after the cellulose raw material is sufficiently destroyed and dispersed, performing solid-liquid separation treatment in a reaction system to obtain reaction recovery liquid and solid powder, washing the powder with alcohol, and then dispersing the solid powder in the alcohol to obtain solid powder dispersion liquid; 4) homogenizing the solid powder dispersion liquid obtained in step 3) to obtain nano-cellulose fiber dispersion liquid; 5) evaporating the alcohol in the nano-cellulose fiber dispersion liquid obtained in step 4) to dryness, so as to obtain the nano-cellulose 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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