Method for rapidly preparing cellulose nanocrystalline

A technology for cellulose and nanocrystals, applied in the field of preparing cellulose nanocrystals, can solve the problems of long preparation period, low yield, environment pollution by concentrated acid, etc., and achieve the advantages of shortened preparation time, good thermal stability and high preparation efficiency. Effect

Inactive Publication Date: 2016-06-29
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of using concentrated acid to pollute the environment in the existing preparation of cellulose

Method used

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  • Method for rapidly preparing cellulose nanocrystalline
  • Method for rapidly preparing cellulose nanocrystalline
  • Method for rapidly preparing cellulose nanocrystalline

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specific Embodiment approach 1

[0024] Embodiment 1: A method for rapidly preparing cellulose nanocrystals described in this embodiment is specifically carried out according to the following steps:

[0025] 1. Prepare the treatment agent: under the condition of temperature of 60°C-90°C, distill the deep eutectic solvent under reduced pressure and stir for 0.5h-2h to obtain the treatment agent;

[0026] The deep eutectic solvent is a mixture of hydrogen bond acceptors and hydrogen bond donors; the molar ratio of the hydrogen bond acceptors and hydrogen bond donors is 1:(1~10);

[0027] The hydrogen bond acceptor is a quaternary ammonium salt; the hydrogen bond donor is an amide, carboxylic acid or polyol;

[0028] 2. Biomass fiber pretreatment: Mix biomass fiber with a treatment agent to obtain a mixture, and then heat the mixture by microwave. The condition of microwave heat treatment is to treat it for 0.5min to 10min at a temperature of 70°C to 100°C. , to obtain a mixed solution containing biomass fiber ...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the quaternary ammonium salt described in step one is choline chloride, choline bromide, choline iodide or betaine; The carboxylic acid is oxalic acid, malic acid, formic acid or lactic acid; the amide described in step one is urea or thiourea; the polyhydric alcohol described in step one is a trihydric alcohol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the biomass fiber described in step 2 is cotton fiber, pulp fiber, wood fiber, bamboo fiber, hemp fiber, straw fiber, Grass plant fiber or algae plant fiber. Others are the same as in the first or second embodiment.

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Abstract

A method for rapidly preparing cellulose nanocrystals, and the invention relates to a method for preparing cellulose nanocrystals. The invention solves the problems of using concentrated acid to pollute the environment, long preparation period, low yield and low product thermal stability in the existing cellulose nanocrystal preparation. Methods: 1. Preparation of treatment agent; 2. Biomass fiber pretreatment; 3. Separation and cleaning; The present invention is used for a method for rapidly preparing cellulose nanocrystals.

Description

technical field [0001] The invention relates to a method for preparing cellulose nanocrystals. Background technique [0002] Natural cellulose has been used as an engineering material for thousands of years, and this use is still continuing today, such as forest products, paper and fabrics. With the development of science and technology and social needs, the traditional use of natural cellulose cannot fully meet the requirements of modern society for high performance and low cost of cellulose-based products. Therefore, how to research and develop next-generation cellulose-based products and engineering applications has attracted widespread attention. With the development of nanotechnology, the research on extracting nanoscale cellulose from natural cellulose fibers by destroying the hierarchical structure continues to deepen. Due to its high specific surface area, size effect and quantum effect, nanocellulose provides objective conditions for it to be used as a building bl...

Claims

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Application Information

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IPC IPC(8): C08B15/02
CPCC08B15/02
Inventor 刘永壮于海鹏徐爱玲樊静
Owner NORTHEAST FORESTRY UNIVERSITY
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