Carboxymethyl fiber

Sodium traits

CMC is a cellulose derivative with a glucose polymerization degree of 200-500 and an etherification degree of 0.6-0.7. It is a white or off-white powder or fibrous substance, odorless, and hygroscopic. The degree of substitution (etherification) of the carboxyl group determines its nature. When the degree of etherification is more than 0.3, it is soluble in lye. The viscosity of the aqueous solution is determined by the pH and the degree of polymerization. When the degree of etherification is 0.5-0.8, it will not precipitate in acid. CMC is easily soluble in water and becomes a transparent viscous solution in water, and its viscosity changes with the concentration and temperature of the solution. The temperature below 60 ℃ is stable, and heating at a temperature above 80 ℃ for a long time will reduce the viscosity.