Sodium carboxymethyl cellulose (also known as: sodium carboxymethyl cellulose, carboxymethyl cellulose, CMC, Carboxymethyl, Cellulose Sodium, Sodium salt of Caboxy Methyl Cellulose) is the world's most widely used on a range, the maximum amount of cellulose species.
Molecular Weight: 263.1976
Sodium carboxymethyl cellulose (CMC) molecular structure
German first obtained in 1918 and was granted the patent in 1921 and seen in the world. Since then to achieve commercial production in Europe. The crude product was only used as a colloid and a binder. From 1936 to 1941, application of sodium carboxymethyl cellulose industry is quite active, invented several patents quite enlightening. During World War II, Germany used sodium carboxymethyl cellulose synthetic detergent. Hercules Inc. in 1943 for the United States for the first time made sodium carboxymethyl cellulose, and the production of refined sodium carboxymethyl cellulose product in 1946, the product was recognized as a safe food additive. Seventies of last century, China began to adopt, began the widespread use of the nineties. Is the world's most widely used, the largest amount of cellulose species.
Structural Formula: C6H7O2 (OH) 2OCH2COONa formula: C8H11O7Na
This product is carboxymethyl cellulose ether sodium salt, is anionic cellulose ether, white or milky white fibrous powder or granules, density 0.5-0.7 g / cc, almost odorless, tasteless, hygroscopic. A transparent colloidal solution is easily dispersed in water, insoluble in an organic solvent such as ethanol. 1% aqueous solution pH of 6.5 to 8.5, when the pH> 10, or 5:00, significantly reduced mucilage viscosity <, at pH = 7 for optimal performance. The thermal stability, a rapid increase in the viscosity below 20 ℃, 45 ℃ when the change is slow, prolonged heating above 80 ℃ can make it gel viscosity and performance variability decreased. Soluble in water, the solution transparent; very stable in alkaline solution, the case is easy to acid hydrolysis, PH value will precipitate 2-3, the case will be a polyvalent metal salt precipitation reactions.
The main purpose
The food industry as a thickener, pharmaceutical industry as drug carriers, daily chemical industry as a bonding agent, anti-Chen Ning agent again. Printing and dyeing industry as sizing agent and printing paste protective colloid. In the petrochemical industry as oil fracturing fluid ingredients.