The dispersibility of carboxymethyl cellulose is that the product will be decomposed in water, so the dispersibility of the product has also become a way to judge its performance. Let’s learn more about it:
1) A certain amount of water is added to the obtained dispersion system, which can improve the dispersibility of the colloidal particles in water, and it is necessary to ensure that the amount of water added cannot dissolve the colloid.
2) It is necessary to disperse the colloidal particles in a liquid carrier medium that is miscible in water, insoluble in water-soluble gels or without water, but it must be larger than the volume of the colloidal particles so that they can be fully dispersed. are monohydric alcohols such as methanol and ethanol, ethylene glycol, acetone, etc.
3) A water-soluble salt should be added to the carrier liquid, but the salt cannot react with the colloid. Its main function is to prevent the water-soluble gel from forming a paste or coagulating and precipitation when it is at rest. Commonly used are sodium chloride and so on.
4) It is necessary to add a suspending agent to the carrier liquid to prevent the phenomenon of 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 carboxymethyl cellulose, if glycerol is used as the suspending agent, the usual dosage is about 3%-10% of the carrier liquid.
5) In the process of alkalization and etherification, cationic or nonionic surfactants should be added, and should be dissolved in the liquid carrier to be compatible with colloids. Commonly used surfactants are lauryl sulfate, glycerin Monoester, propylene glycol fatty acid ester, its dosage is about 0.05%-5% of the carrier liquid.
Post time: Nov-04-2022