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Preparation of cellulose solution

A cellulose solution and cellulose technology, applied in the field of cellulose solution preparation, can solve the problems of complicated cellulose dissolution process, high cost, harsh conditions, etc., and achieve the effects of shortening the dissolution time, promoting dissolution, and reducing preparation steps

Inactive Publication Date: 2011-06-22
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: In order to overcome the disadvantages of complicated cellulose dissolving process, high cost and harsh conditions in the prior art, the present invention proposes a method for quickly preparing cellulose solution with few preparation steps, simple and easy to operate, green and environment-friendly

Method used

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  • Preparation of cellulose solution
  • Preparation of cellulose solution
  • Preparation of cellulose solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get microcrystalline cellulose 5g (viscosity average molecular weight 2.4 * 10 4 ), lithium chloride 8g and dimethylacetamide 100ml, and then ultrasonic treatment for 10 minutes, the frequency used is 20KHz, the power is 600w, after stirring evenly at room temperature, freeze at -6 °C for 3 hours to obtain A stable cellulose solution.

Embodiment 2

[0027] Get microcrystalline cellulose 8g (viscosity average molecular weight 3.1 * 10 4 ), lithium chloride 8g and dimethylacetamide 100ml, and then ultrasonic treatment for 15 minutes, the frequency used is 25KHz, and the power is 650w. After stirring at room temperature, freeze at -8°C for 3 hours to obtain A stable cellulose solution.

Embodiment 3

[0029] Get microcrystalline cellulose 15g (viscosity average molecular weight 3.1 * 10 4 ), lithium chloride 9g and dimethylacetamide 100ml, and then ultrasonic treatment for 20 minutes, the frequency used is 20KHz, and the power is 700w. After stirring at room temperature, freeze at -10°C for 4 hours to obtain A stable cellulose solution.

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Abstract

The invention discloses a method for preparing a high-concentration cellulose non-derivatization solution, wherein, the method has few steps in the preparation process, and is simple, easy to operate, green, environment-friendly and quick. The method is realized by the following technical proposal: firstly, 2 to 20 percent of cellulose (w / v), 4 to 10 percent of lithium chloride (w / v) and dimethylacetamide are subjected to ultrasonic treatment for 5 to 20 minutes with a frequency of between 20 and 25KHz and a power of between 400 and 800W, are evenly stirred at room temperature, then are frozen for 3 to 5 hours at a temperature of between 6 and 20 DEG C below zero, and a cellulose solution which can steadily exist at room temperature is obtained. The method is particularly suitable for natural cellulose with a molecular weight lower than 5x10<4>. In the method, the cellulose does not form new derivatives after the ultrasonic treatment and refrigerating treatment. The method provides abetter reaction medium and a preparation means for further molecular modification design to the cellulose to produce required functionized materials.

Description

technical field [0001] The invention belongs to the technical field of preparing cellulose solution. Background technique [0002] With the gradual depletion of petrochemical resources and the increasing environmental pollution caused by waste plastics, the use of natural renewable materials - cellulose has attracted the attention and research of a large number of materials science and chemical science and technology personnel. Plant fiber is the most abundant natural polymer on the earth. It contains about 10-25% in herbaceous plants, 40-53% in wood, 60-85% in bast fibers such as flax, and 90% in cotton. %. In addition, cellulose is also the basic component of plant cells. The carbon constituting cellulose in natural organisms accounts for about 40%, and more than 100 billion tons of cellulose are produced through photosynthesis every year. An inexhaustible renewable organic resource. Because cellulose is cheap, degradable, and non-polluting to the environment, all count...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08L1/02C08K3/24C08B1/00
Inventor 储富祥许玉芝王春鹏李芬芬曹珍艳陈日清金立维
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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