Preparation method of nanocellulose

Abstract

The invention belongs to the technical field of fiber materials, and particularly relates to a preparation method of nanocellulose. The method comprises the following steps of: mixing plant waste or powder with a dilute acid solution for reaction to obtain a preliminary fiber product; under the action of a weak acid regulator, subjecting the preliminary fiber product, sodium chlorite and water tomixed reaction to obtain a palm fiber product; mixing and reacting the palm fiber product, alkali liquor and oxidizing substances to obtain a bleached fiber product; then mixing and reacting the bleached fiber product with a TEMPO oxidation system to obtain an oxidized fiber slurry; and finally, carrying out mechanical treatment on the oxidized fiber slurry to obtain the nanocellulose. The nanocellulose provided by the invention is treated by extruder equipment, continuous production can be realized, the unit product energy consumption is low, the diameter of the nanocellulose is relatively small, the diameter range distribution is narrow, the purity of the nanocellulose in a certain diameter range is relatively high due to the narrow diameter range distribution, and various mixing and shearing equipment is provided for selection, and the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of fiber materials, and in particular relates to a preparation method of nanocellulose. Background technique [0002] The planet is going through a severe energy and environmental crisis due to the unsustainable consumption of non-renewable raw materials during centuries of industrialization. In the past 50 years, about 90% of the world's energy demand was mainly met by fossil fuels, and the carbon dioxide emitted into the earth's atmosphere was about 1.5×10 10 Mg, which contributes to global warming. One solution that may help to achieve sustainable goals is the "secondary use" of lignocellulosic residues such as crop residues (straw, corn stalks, bagasse) and tree waste (wood flour, bark, leaves )etc. Lignocellulose, the most abundant and renewable but underutilized biological resource in nature, has become one of the main sources of primary renewable energy in the 21st century, providing nearly 14% of ...

AI Technical Summary

Problems solved by technology

[0005] The existing nanocellulose preparation methods generally process cellulose raw materials through a large number of chemical reagents or large-scale mechanical equipment, such as using a large amount of concentrated acid to cellulose After degradation, a large amount of acidic waste liquid will have a serious impact on the environment, or use large-scale equipment to produce nanocellulose, which consumes high energy and has low yield, and is very vulnerable to lack of equipment, which greatly limits its application.

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