Method for preparing water-soluble cellulose and water-soluble cellulose prepared by the same

A technology for water-soluble cellulose and cellulose solution, applied in the field of preparation of water-soluble cellulose derivatives, can solve the problems of slow research progress, complicated preparation process and high price of water-soluble cellulose, and achieve reasonable and efficient utilization and dissolution. The effect of high rate and fast dissolution rate

Active Publication Date: 2015-11-25
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In recent years, the research on water-soluble cellulose has progressed slowly. Although there are related reports on the application of water-soluble hydroxypropyl cellulose and hydroxyethyl cellulose, due to its high price and complicated preparation process, in recent years, little research

Method used

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  • Method for preparing water-soluble cellulose and water-soluble cellulose prepared by the same
  • Method for preparing water-soluble cellulose and water-soluble cellulose prepared by the same
  • Method for preparing water-soluble cellulose and water-soluble cellulose prepared by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Crushed fiber pulp board

[0052] Put the cotton linter cellulose pulp board (purchased from Shandong Yinying Co., Ltd.) into a high-speed beater for cellulose crushing treatment. Generally, the fiber pulp board is crushed until it is completely fluffy, and there is no pulp board. A fluffy linter cellulose is obtained, wherein the pulverization time is 3-5 min.

[0053] The fluffy fiber pulp sheet is more conducive to the immersion of the solvent ionic liquid, which in turn facilitates the dissolution of cellulose.

[0054] 2. Dissolving treatment

[0055] Put fluffy linter cellulose (0.5g) and ionic liquid 1-ethyl-3-methylimidazole acetate (10g) into a 50mL beaker, and use a magnetic stirrer at 80°C under normal pressure, Stirring is carried out to dissolve the linter cellulose to obtain a transparent and viscous cellulose-ionic liquid solution, wherein the weight ratio of cellulose to ionic liquid is 1:20, the stirring time is 30min, and the stirring speed is 150...

Embodiment 2

[0066] 1. Crushed fiber pulp board

[0067] The cotton linter cellulose pulp board is placed in a high-speed beater for cellulose pulverization to obtain fluffy cotton linter cellulose, wherein the pulverization time is 3-5 minutes.

[0068] 2. Dissolving treatment

[0069] Put fluffy linter cellulose (0.5g) and ionic liquid 1-ethyl-3-methylimidazolium acetate (15g) into a 50mL beaker, seal the mouth of the beaker with plastic wrap, and store at 70°C, Under normal pressure, a magnetic device is used to stir the cotton linter cellulose to obtain a transparent and viscous cellulose-ionic liquid solution, wherein the weight ratio of cellulose and ionic liquid is 1:30, and the stirring time for 20min, the stirring speed is 200rpm.

[0070] 3. Modification treatment

[0071] Under the condition of stirring and keeping the temperature of the cellulose-ionic liquid solution at 70°C, slowly add a chemical modifier (dichloroacetyl chloride, 2.5g) into the cellulose-ionic liquid solu...

Embodiment 3

[0077] 1. Crushed fiber pulp board

[0078] The cotton linter cellulose pulp board is placed in a high-speed beater for cellulose pulverization to obtain fluffy cotton linter cellulose, wherein the pulverization time is 3-5 minutes.

[0079] 2. Dissolving treatment

[0080] Put fluffy linter cellulose (0.5g) and ionic liquid 1-ethyl-3-methylimidazolium acetate (5g) into a 50mL beaker, seal the mouth of the beaker with plastic wrap, and store at 90°C, Under normal pressure, a magnetic device is used for stirring treatment to dissolve the linter cellulose to obtain a transparent and viscous cellulose-ionic liquid solution, wherein the weight ratio of cellulose and ionic liquid is 1:10, and the stirring time for 30min, the stirring speed is 200rpm.

[0081] 3. Modification treatment

[0082] Under the condition of stirring and keeping the temperature of the cellulose-ionic liquid solution at 90° C., slowly add a chemical modifier (dichloroacetyl chloride, 1.0 g) into the cellulo...

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Abstract

The present invention provides a method for preparing water-soluble cellulose. The method uses linter pulp board as a raw material, which is dissolved by an ionic liquid, and then supplemented with a modifier and a catalyst for chemical modification, so as to prepare a water-soluble cellulose derivative. The water-soluble cellulose derivative prepared by the method has the advantages of good solubility and high degree of polymerization, and has broad application prospects in medical engineering, food industry and cellulosic functional materials. The preparation method is simple and convenient for operation, has easily controlled process conditions, greatly simplifies the production process and reduces costs; and the method for the first time reports water-soluble cellulose preparation based on the ionic liquid dissolving system.

Description

technical field [0001] The present invention relates to a method for preparing water-soluble cellulose derivatives. Background technique [0002] As the main component of biomass such as trees and grasses, cellulose is the most abundant renewable natural polymer compound in nature. It has the characteristics of recyclability, good biocompatibility, biodegradability, low price, With many advantages such as easy modification, it is known as one of the main raw materials in the future industry, energy and other fields. Although the industrial utilization of cellulose has been carried out for a long time, the application potential of cellulose has not been exploited due to its highly crystalline structure and insolubility in common solvents. According to statistics, as many as 100 billion tons of cellulose resources are produced through photosynthesis in the world every year. However, only 2 million tons of newly generated cellulose resources are used for production each year, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/06C08B3/28
Inventor 张学铭逄锦慧张乔会吴苗赵东红
Owner BEIJING FORESTRY UNIVERSITY
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