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Preparation method of nanocellulose

A nano-cellulose and fiber technology, applied in the field of fiber materials, can solve problems such as lack of equipment, environmental impact, and application restrictions, and achieve the effects of easy removal, easy removal of impurities, and high solid content

Active Publication Date: 2020-12-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method of nanocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The embodiment of the present invention provides the first nanocellulose, and the specific preparation steps are as follows:

[0074] (1) Weigh 50g of wood powder that has passed through a 80-mesh sieve, add the wood powder to 1000ml of dilute sulfuric acid solution (the mass percent of dilute sulfuric acid solution is 1.5%), then place it in a water bath at 130°C and stir for 120min, and the reaction ends After that, suction filtration, washing to neutrality and drying are carried out successively to obtain the preliminary fiber product;

[0075] (2) 40g of the preliminary fiber product prepared in step (1) is weighed, added to 800ml of deionized water, and dispersed by magnetic stirring, then 6g of sodium chlorite is added to form a reaction solution, and the temperature of the water bath is set The temperature is 80°C, and the reaction is carried out by adding 6g of sodium chlorite every 30 minutes for a total of 120 minutes (that is, a total of 4 times of sodium chl...

Embodiment 2

[0080] The embodiment of the present invention provides the second nanocellulose, and the specific preparation steps are as follows:

[0081] (1) Weigh 50g of wood powder that has passed through a 80-mesh sieve, add the wood powder to 1000ml of dilute sulfuric acid solution (the mass percent of dilute sulfuric acid solution is 1.5%), then place it in a water bath at 130°C and stir for 120min, and the reaction ends After that, suction filtration, washing to neutrality and drying are carried out successively to obtain the preliminary fiber product;

[0082] (2) 40g of the preliminary fiber product prepared in step (1) is weighed, added to 800ml of deionized water, and dispersed by magnetic stirring, then 6g of sodium chlorite is added to form a reaction solution, and the temperature of the water bath is set The temperature is 80°C, and the reaction is carried out by adding 6g of sodium chlorite every 30 minutes for a total of 120 minutes (that is, a total of 4 times of sodium ch...

Embodiment 3

[0087] The embodiment of the present invention provides the third nanocellulose, and the specific preparation steps are as follows:

[0088] (1) Weigh 50g of wood powder that has passed through a 80-mesh sieve, add the wood powder to 1000ml of dilute sulfuric acid solution (the mass percent of dilute sulfuric acid solution is 1.5%), then place it in a water bath at 130°C and stir for 120min, and the reaction ends After that, suction filtration, washing to neutrality and drying are carried out successively to obtain the preliminary fiber product;

[0089] (2) 40g of the preliminary fiber product prepared in step (1) is weighed, added to 800ml of deionized water, and dispersed by magnetic stirring, then 6g of sodium chlorite is added to form a reaction solution, and the temperature of the water bath is set The temperature is 80°C, and the reaction is carried out by adding 6g of sodium chlorite every 30 minutes for a total of 120 minutes (that is, a total of 4 times of sodium chl...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/08C08B15/02
CPCC08B15/08C08B15/02
Inventor 黄德远张海燕洪浩群
Owner GUANGDONG UNIV OF TECH
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