Common salt.ã€‚ Flocculent white powder, odorless, tasteless, non-toxic.Â Soluble in water to form a transparent colloidal solution, the solution was neutral. Light and heat stability. Hygroscopicity.Do not dissolve in acid, cresol, ethanol, acetone, chloroform, benzene, etc., insoluble in methanol, ether.Â Substituted with carboxymethyl cellulose derivatives, cellulose treated with sodium hydroxide to form alkali cellulose, and then with chloroacetic acid reaction.Â Constitute the glucose units of cellulose can be replaced with three hydroxyl groups, thus obtain different degrees of product substitution.Â 1g dry weight per 1mmol carboxymethyl leaders who, in water and dilute acid insoluble, but swelling can be used for ion exchange chromatography. åœ¨0.5mol/L NaCl Carboxymethyl pKa in water of about 4, in 0.5mol / L NaCl in about 3.5, is the weak acid cation exchanger, pH4 or more usually used for the separation of neutral and basic proteins.Â More than 40% of carboxymethyl substitution is hydroxy may form a stable water-soluble high viscosity colloid solution.Â CMC viscosity of the pharmaceutical industry for the selection of an appropriate adhesive tablet, disintegrating agent, suspending agent suspensions.Â Replacement of the food industry with high degree of CMC for ice cream, canned food, fast cooking of the thickener, beer foam stabilizer. Widely used in dyeing, pesticide processing, pharmaceutical, paper, paint, ceramics, oil, food and other industries as sizing agent, thickener, emulsifier, emulsion stabilizer, binder, film forming agent.
In the pharmaceutical, cosmetic, food industry, widely used as a thickening agent, suspending agent, binder, protective colloid, etc.