Preparation of cellulose solution

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 dimethyl acetamide 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 a better 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 countri...

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

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