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Method for improving dissolution performance of cellulose in ion liquid

A technology of cellulose dissolution and ionic liquid, applied in the field of cellulose, can solve the problems of restricting the industrial preparation of new cellulose materials, and achieve the effects of short processing time, good effect and easy dissolution

Inactive Publication Date: 2011-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the ionic liquid used for cellulose dissolution at home and abroad is mainly 1-butyl-3-methylimidazolium chloride salt, but the cellulose with a high degree of polymerization often needs to be dissolved in the ionic liquid at 80-100 ° C. Keep more than 10h to ensure the complete dissolution of cellulose, which greatly limits the industrial preparation of new cellulose materials in ionic liquids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Disperse cellulose in ethanol according to the ratio of cellulose to ethanol mass volume ratio of 2:100g / mL to obtain ethanol suspension of cellulose, stir at room temperature for 1h to disperse evenly, and filter to obtain fluffy cellulose Cellulose was dried in an oven at 50° C. for 10 h to obtain ethanol-treated cellulose;

[0022] (2) Disperse the ethanol-treated cellulose in ethanol again according to the ratio of cellulose to ethanol mass volume ratio of 2:100g / mL, then use 80W ultrasonic treatment at 10°C for 5min, and filter to obtain fluffy cellulose Cellulose is dried in an oven at 50° C. for 10 hours to obtain ultrasonically treated cellulose;

[0023] (3) With the ionic liquid 1-butyl-3-methylimidazole chloride as a solvent, the ultrasonically treated cellulose was prepared at a ratio of 1:100 according to the mass ratio of the absolute dry cellulose to the ionic liquid at 85°C. Add it into the ionic liquid, dissolve the cellulose under the condition of...

Embodiment 2

[0026] (1) Disperse cellulose in ethanol according to the ratio of cellulose to ethanol mass volume ratio of 5:100g / mL to obtain ethanol suspension of cellulose, stir at room temperature for 10h to disperse evenly, and filter to obtain fluffy cellulose Cellulose was dried in an oven at 60° C. for 5 hours to obtain ethanol-treated cellulose;

[0027] (2) Using the ionic liquid 1-butyl-3-methylimidazole chloride as a solvent, the ethanol-treated fiber was prepared at a ratio of 1.5:100 according to the mass ratio of the absolute dry cellulose to the ionic liquid at 110°C. The cellulose was added into the ionic liquid, and the cellulose was dissolved under the condition of cutting off moisture. The dissolution of the cellulose was observed by a polarizing microscope. The dissolution process was kept evenly stirred, and the dissolution time was recorded when the observation field of the polarizing microscope was completely black.

[0028] It was determined that the dissolution tim...

Embodiment 3

[0030] (1) Disperse cellulose in ethanol according to the ratio of cellulose to ethanol mass volume ratio of 10:100g / mL to obtain ethanol suspension of cellulose, stir at room temperature for 8h to disperse evenly, and filter to obtain fluffy The cellulose was dried in an oven at 55° C. for 8 hours to obtain ethanol-treated cellulose;

[0031] (2) Disperse the ethanol-treated cellulose in ethanol again according to the ratio of cellulose to ethanol mass volume ratio of 10:100g / mL, and then use 100W microwave treatment at 20°C for 60min, and filter to obtain fluffy cellulose Cellulose was dried in an oven at 55° C. for 8 hours to obtain microwave-treated cellulose;

[0032] (3) With the ionic liquid 1-butyl-3-methyl imidazole chloride as a solvent, under the condition of 140°C, the microwave-treated cellulose Add it into the ionic liquid, dissolve the cellulose under the condition of cutting off moisture, observe the dissolution of the cellulose with a polarizing microscope, k...

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Abstract

The invention discloses a method for enhancing the solubility property of cellulose in ionic liquid, comprising the following steps: the cellulose is dispersed and processed in ethanol to obtain the ethanol processed by the ethanol; the cellulose processed by the ethanol is dispersed in the ethanol again and is processed by ultrasonic waves or microwaves to obtain the cellulose processed by the ultrasonic waves or the microwaves; and when the cellulose processed by the ethanol, the ultrasonic waves or the microwaves is added in the ionic liquid to dissolve, the dissolution time of the cellulose can be obviously shortened. The cellulose process method has simple operation, short time and good effect, can shorten the dissolution time of the cellulose from more than 10 hours to 0.5-3 hour(s), and is suitable for the dissolution of the cellulose in the ironic liquid.

Description

technical field [0001] The invention belongs to the field of cellulose, in particular to a method for improving the solubility of cellulose in ionic liquids. Background technique [0002] As the most abundant renewable resource in nature, the total amount of cellulose in the plant kingdom is about 2.6×10 12 t, in addition, about 1.0×10 cellulose is newly produced through photosynthesis in the world every year 11 t. At present, cellulose materials have been widely used in many industrial fields such as fibers, papermaking, films, polymers, coatings, etc., but their application potential has not been fully developed. In recent years, as the total amount of non-renewable fossil resources such as petroleum and coal has been decreasing, the importance of cellulose renewable resources has become increasingly significant. Especially since the 1980s, as people have paid more and more attention to environmental pollution, many countries, especially developed countries, have listed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08L1/02
Inventor 刘传富张爱萍李维英孙润仓岳凤霞
Owner SOUTH CHINA UNIV OF TECH