The Introduction of Sodium Carboxymethyl Cellulose

Views: 165 Author: Site Editor Publish Time: 2022-01-26 Origin: Site

Sodium Carboxy Methyl Cellulose(CMC) is an odorless, tasteless, non-toxic white powder or micro-yellow fibrous in the pure state.

Sodium Carboxy Methyl Cellulose(CMC) is easy to absorb moisture, it dissolves easily in cold or hot water as the colloidal solution, it can not dissolve in many organic solvents such as methanol, ethanol, acetone, chloroform, benzene and so on. The degree of substitution (D.S) is an important factor affects its water-soluble, the viscosity also affects its water-soluble greatly. Sodium Carboxymethyl Cellulose(CMC) is usually alkali when viscosity between 25mPa.s-50000mPa.s, D.S is about 0.3. Sodium Carboxymethyl Cellulose(CMC) is water-soluble when its D.S is more than 0.4. With the increase of D.S, the transparency of the Sodium Carboxymethyl Cellulose(CMC) water substitution becomes much better. Like another macromolecule dielectric, when Sodium Carboxymethyl Cellulose(CMC) dissolving, the first phenomenon is expansion, and then dissolved gradually. So in the preparation solution, the particles should be uniform wetting, then the Sodium Carboxymethyl Cellulose(CMC) can be dissolved quickly. Otherwise, the Sodium Carboxymethyl Cellulose(CMC) is an expansion in water solution, the particles form a strong involucre or plastic coating so that the particles scattered difficulty resulting in dissolution difficulty.

CMC

The balance moisture of Sodium Carboxymethyl Cellulose (CMC) with the increase of air humidity increased, with the rise in temperature decreases. At room temperature and the average humidity 80-85%, the balance of moisture more than 26 percent, however the moisture of products less than 10%, lower than the balanced moisture. Even if the moisture content at about 15 percent, there have no difference in appearance. But when moisture content at more than 20 percent, some particles adhere to one another will be able to see, the higher the viscosity, the more obvious of the phenomenon.

The Sodium Carboxymethyl Cellulose(CMC) is a polarity macromolecule compound, its degree of absorbing moisture dominated by the relative humidity, but also the number of polarity group. The higher the D.S, that is, if the number of polarity group is larger, the degree of absorbing moisture is bigger.

For the Sodium Carboxymethyl Cellulose(CMC) solution, its viscosity changes with the velocity gradient can be explained: Because the dispersed phase of Sodium Carboxymethyl Cellulose (CMC) is hydrophilic, after sopping water, at first it will expand, and then dissolved as macromolecules. Because the volume of the molecules is large, the viscosity is great. If the tangential force is increasing, the macromolecules begin directional function, the long axis will be gradually transformed into the flow direction, and the tangential force bigger, the more complete the turning, so the viscosity resistance becoming smaller when the Sodium Carboxymethyl Cellulose (CMC) solution flowing. At the same time, the solvent layer around the Sodium Carboxymethyl Cellulose(CMC) can also be deformed due to tangential force changing, which is the reason for the resistance reducing. In low concentrations Sodium Carboxymethyl Cellulose(CMC) solution, velocity gradient affect on the viscosity is very small, when the solution concentration increases, the velocity gradient affect on viscosity also increases. The viscosity of the Sodium Carboxymethyl Cellulose(CMC) solution will increase with the D.P increasing, but the increase rate of the viscosity is different because of the degree of substitution.

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