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Sodium Carboxymethyl Cellulose (sodium Carboxymethyl Cellulose, Abbreviated CMC-Na)

- Mar 20, 2015 -

Sodium carboxymethyl cellulose (sodium carboxymethyl cellulose, abbreviated CMC-Na) is a cotton waste and waste paper pulp as a raw material and synthetic anionic polymer compound. Molecular weight of 6400 (± 1000), has excellent water solubility and a film, widely used in petroleum, geology, chemical, light industry, food, pharmaceutical and other industries, known as "industrial MSG." April 1989 Ministry of Chemical Industry has the CMC-Na as a "new field of fine chemicals `August 5 'product planning" .CMC-Na production development today, the synthesis methods are mainly two types of water-borne direct method (spray soda), and the other is the use of organic solvent soluble media law. Because after who have less alkaline, etherification time is short, ether agent utilization, higher characteristic, so far has been adopted by many domestic manufacturers. However, there is widespread domestic CMC-Na low pass rate, a substantial increase in the cost of new Product development is slow and other issues key indicators to measure the quality of CMC-Na is the degree of substitution (DS) and viscosity Generally, DS is different, the CMC-Na's character is different;. substitution increases, the transparency and stability of the solution the better. It is reported, CMC-Na degree of substitution in 0.7 ~ 1.2 Transparency, when good, its solution viscosity at pH 6 to 9:00 maximum. In order to ensure its quality, in addition to select etherification agent, but also a number of factors must be considered and viscosity of the substitution, for example, the relationship between the amount of the base and between the etherifying agent, etherification time, system water content, temperature, pH, salt concentration and the like

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