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Sodium Carboxymethyl Cellulose (CMC)

Sodium Carboxymethyl Cellulose (CMC)

Product details

Sodium Carboxymethyl Cellulose (CMC)

Physicalproperties

The pure Sodium Carboxymethyl Cellulose is white or milk white fibrous powder or particles, odorless and tasteless. It is in soluble in organic solvents such as methanol, alcohol, diethyl ether,acetone, chloroform and benzene but soluble in water, methanol and benzene in 60% proportion of water.

The solution viscosity remains normal in a wide range of pH values but the most stable in the range of pH 7-9. As the pH valuedecreases, the solution will be acidified.

Sodium carboxymethyl cellulose equilibrium water content will increase with the rise of air humidity but decrease with the rise of temperature. In general when the viscosityis with in 25-50Pa•s and the degree of substitution is about 0.3, it shows alkaline solubility and while the degree of substitution is over 0.4, it shows water solubility.

With the rise of DS, the transparency of solution improves accordingly. In addition, the replacement homogeneity also has angreat effect on the solubility. CMC has hygroscopic properties, and its moisture absorption level is related to the atmospheric temperature and relative humidity. When reaching the equilibrium, it will no longer absorbmoisture.

2. Production of CMC

Sodium Carboxymethyl Cellulose (Cellulose Gum or CMC) is extracted from wood pulp and pure cotton cellulose. Sodium Carboxymethyl Cellulose can be divided into industrial grade and food grade.

Cellulose derivatives with carboxymethyl substituents are treated with sodium hydroxide to form cellulose with alkali cellulose and reacted with monochloroacetic acid. The glucose units that make up the cellulose have three hydroxyl groups that can be exchanged, so that products with different degrees of position can be obtained. An average of 1 mmol per 1 g of the introductionof 1 mmol of carboxymethyl, insoluble in water and dilute acid, but can be swollen for ion exchange chromatography. The carboxymethyl pKa is about 4 inpure water and about 3.5 in 0.5 mol / L NaCl, which is a weakly acidic cation exchanger, usually at pH 4 for the separation of neutral and alkaline proteins.More than 40% of the hydroxyl groups are carboxymethyl displacements soluble in water to form a stable high viscosity colloidal solution.

Application of CMC in industries

1. In Building Paint Industry

Sodium Carboxymethylcellulose can be used in build painting with favorable dispersion function and well-distributed coating. Without layering,it has good stability performance and thickening effects to regulate the viscosity of paint. It can match most surface-active agents and preservatives used in water-soluble paint. It can act as the retarder of concrete construction and the addition of Sodium Carboxymethyl cellulose into the concrete has obvious thickening and water-retaining functions. Moreover, it helps to prolong the setting time of concrete, increase the early strength of concrete, and avoid cracks in the building. In addition, Sodium Carboxymethyl cellulose can also be used as pumping aid of concrete to keep commodity concrete mixture non-bleeding and without segregation and to improve thehomogeneity of concrete.

2. In textile industry

Sodium Carboxymethyl cellulose can be used as sizing, leveling, and thickening agents of textile pulp. Sodium carboxymethyl cellulose can act as a thickening agent in printing pastes, with features like small residue and high coloring rate, and is a very promising class of textile auxiliaries.

3. In Papermaking Industry

Sodium Carboxymethyl cellulose can be used as the sizing agent of paper in papermaking industry to greatly improve the dry strength, wet strength, oil resistivity, ink absorption and water resistance of paper.


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