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Characterization of Sodium Carboxymethyl Cellulose CMC
CMC is odourless, odourless, non-toxic, moisture-absorbent white or yellowish granules and fibrous powder. It has excellent water solubility, viscosity, emulsification, diffusibility, enzyme resistance and stability. Sodium carboxymethyl cellulose CMC solution is a colourless transparent colloid, and its transparency is improved with the increase of substitution. The aqueous solution of CMC is neutral or weak alkaline.

Because CMC for food has the above characteristics, it can be used as sizing agent, emulsifier, stabilizer, adhesives, suspension agent, thickener, detergent, polishing agent, crystal production preventive agent, widely used in textile, printing and dyeing, petroleum, paper-making, leather, ink, ceramics, artificial fur, synthetic washing, etc. Putty powder, imitation porcelain paint, building glue, cigarette, putty paste, ceramics and other industries. With the continuous improvement of technology, the application prospects will be broader.

The sodium salt of cellulose carboxymethyl ether belongs to anionic cellulose ether. It is a white or milky white fibrous powder or granule with a density of 0.5-0.7 g/cubic centimetre. It is almost odourless, odourless and hygroscopic. It is easy to disperse in water to form a transparent colloidal solution and insoluble in organic solvents such as ethanol. CMC in food is an important water-soluble macromolecular cellulose ether with wide application and rapid development. It can be used as emulsifier, thickener, sizing agent, film-forming agent, binder and so on. Because it has many characteristics which are not found in general natural rubber and synthetic rubber, it has been widely used in tobacco, synthetic washing and soap industry, textile printing and dyeing industry, oil drilling mud, paper industry, food industry, paint industry in recent years. Ball-forming products such as mould powder, compound fertilizer, daily chemical industry, construction and civil industry. The practice has proved that the use of CMC can not only play its unique role but also save industrial grain. It is a rare synthetic rubber product.

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