Now, sodium carboxymethyl cellulose is widely used in various industries, with the gradual increase in annual production of extremely rapid development of the industry. Its outstanding features of its rapid development are inseparable.
CMC can be resistant to temperature dry 140-150 ℃ minutes or less, with the majority of the same solution, when the temperature rises to reduce the viscosity of the CMC solution, but these solutions remain stable when heated, after cooling, the viscosity will return to the The initial viscosity.
CMC is an acid having a strong acidity, if treatment with a strong acid CMC, would liberate the free acid HCMC, this acid is insoluble in water
To know the situation precipitated only happen in the case of lower PH value (approximately 2.5), if the PH value exceeds this value would not have precipitated the situation, example: In the PH value of 3.5 in acetic acid medium.
Sodium carboxymethyl cellulose as a buffer and the ion exchange, if the PH value is kept in the range described above, a small amount of an acid may be added to the aqueous solution, and does not change the solubility of the.
③ solvent resistance:
Sodium carboxymethyl cellulose is insoluble in organic solvents. Even if the reaction may produce some swelling, but the sodium carboxymethyl cellulose does not dissolve, but may be added a certain proportion of the water-soluble organic solvent in the CMC solution (typically 30-40%).
Some reaction of the metal salt and CMC, hydroxyethyl cellulose, precipitated the corresponding acid salts, copper salts, aluminum salts, tin salts, high iron salts, silver salt and a zirconium salt such reaction occurs. CMC calcium and magnesium salts do not react and generate precipitation, can be used for water, the presence of a weak concentration of the alkali metal salt will normally reduce the viscosity of the solution, but there is a strong alkali salt concentration will increase the viscosity of the solution, there are sometimes even cause gelation.
⑤ water content:
CMC is a hygroscopic substance is placed in the air-dried CMC absorb moisture of 12% -25% (see the main air humidity), in order to avoid a given period of time due to changes in water content leads to a concentration of active substance change, CMC should be stored in its original packaging, it is recommended to store in a dry place.
With the improvement of the production process, the development of technology, more high-quality products will gradually come out, more powerful, more widely, the product towards the direction of diversification.