Preparation method of instant sodium carboxymethyl cellulose

Abstract

The invention discloses a preparation method of instant sodium carboxymethyl cellulose, and the method comprises the following steps: retting, beating and loosening cotton, and carrying out hot washing, acid treatment, bleaching and dehydration to obtain a raw material cotton fiber; adding ethanol and sodium hydroxide into a kneading machine, performing uniform mixing, adding the raw material cotton fiber, and performing stirring to obtain alkalized cellulose; carrying out etherification reaction on the alkalized cellulose obtained in the step S2 and monochloroacetic acid to obtain a sodium carboxymethyl cellulose crude product; performing neutralizing and washing: neutralizing the sodium carboxymethyl cellulose crude product obtained in the step S3 by using an aqueous solution of alcohol containing acetic acid, performing washing by using alcohol, and performing filtering to obtain a solid substance; performing drying treatment: drying the solid substance obtained in the step S4, and performing sieving treatment to obtain a sodium carboxymethyl cellulose finished product. Cotton fibers which are rich in resource and low in price are used as raw materials, the quality of the cotton fibers is improved, high-temperature and high-pressure production is not needed, energy consumption is low, and the prepared product is good in stability, long in shelf life and excellent in quality.

Description

Technical field[0001]The present invention relates to the field of carboxymethylcellulose sodium, in particular a method of preparing an instant carboxymethylcellulose.Background technique[0002]Sodium carboxymethylcellulose is an organic substance, a chemical formula [C6H7O2 (OH) 2OCH2COONA] N, is a carboxymethylated derivative of cellulose, is the most important ionic cellulose gel, sodium carboxymethylcellulose. It is an anionic polymer compound obtained by natural cellulose and caustic, and a chloric acid reaction, the molecular weight is from several thousand to million, with the rapid development of the national economy, and the increasing economic globalization China's cellulose ether production industry faces a huge challenge. At present, most of the production of carboxymethylcellulose sodium has high cost, low yield and low volume, poor uniformity, low dissolution rate and low degree of dissolution, for this purpose A preparation method of an instant carboxymethylcellulose ...

AI Technical Summary

Problems solved by technology

[0002] Sodium carboxymethyl cellulose is an organic substance with the chemical formula [C6H7O2(OH)2OCH2COONa]n. It is a carboxymethylated derivative of cellulose and the most important ionic cellulose gum. Sodium carboxymethyl cellulose is usually It is an anionic polymer compound prepared by reacting natural cellulose with caustic alkali and monochloroacetic acid. The molecular weight ranges from several thousand to millions. With the rapid development of the national economy, the pace of economic globalization is accelerating. , my country's cellulose ether production industry is facing huge challenges. Most of the currently produced sodium carboxymethylcellulose has problems of high cost, low yield and viscosity, poor substitution uniformity, and low dissolution rate and degree. For this reason, we Propose a kind of preparation method of instant sodium carboxymethylcellulose for solving the above problems