Sodium carboxymethyl cellulose is a kind of cellulose that is widely used now. This product has more outstanding characteristics. In order to fully understand its performance and make full use of it, take the functional characteristics that are easy to disperse in water as an example. For CMC -Na dispersibility to understand.
1. A suspending agent needs to be added to the carrier liquid to prevent gel precipitation. The main suspending agent can be glycerin, hydroxypropyl methylcellulose, etc. The suspending agent should be soluble in the liquid carrier and compatible with the colloid. For sodium carboxymethylcellulose, if glycerin is used as the suspending agent, the usual dosage is about 3%-10% of the carrier liquid.
2. Add appropriate amount of water when carrying out the dispersion system, which can improve the dispersibility of the colloidal particles in water, and ensure that the amount of water added cannot dissolve the colloid.
3. A cationic or non-ionic surfactant should be added during the reaction of alkalization and etherification, and it should be dissolved in the liquid carrier to be compatible with the colloid. Commonly used surfactants include lauryl sulfate and glycerin Monoester, propylene glycol fatty acid ester, its dosage is about 0.05%-5% of the carrier liquid.
4. The colloidal particles should be dispersed in a water-soluble, miscible, insoluble to water-soluble gel or liquid carrier medium without water, but it must be larger than the volume of the colloidal particles so that they can be fully dispersed. This type of carrier is mainly It is a monohydric alcohol, such as methanol and ethanol, ethylene glycol, acetone, etc.
5. Water-soluble salt should be added to the carrier liquid, but the salt cannot react with the colloid. Its function is mainly to prevent the water-soluble gel from forming a paste or coagulation and precipitation when it is still, and sodium chloride is commonly used.
All in all, in the use of sodium carboxymethylcellulose, in order to disperse it, it is necessary to add an appropriate amount of water. Remember that salt cannot react with colloids, so when using CMC-Na, pay more attention to avoid affecting its performance. The play, can not achieve the effect of use.
