Essentially, carboxymethyl cellulose na and polyanionic cellulose are the same chemical. It's just that their production standards are slightly different, leading to different parameters. Compared with carboxymethyl cellulose na, polyanionic cellulose has the characteristics of "three highs and one low": high stability, high temperature resistance, high acid and alkali salt resistance, and low usage.
Carboxymethyl cellulose na refers to sodium carboxymethyl cellulose in the usual sense, while polyanionic cellulose generally refers to the "solvent-slurry method" process that has been successfully developed and widely used to produce a new type of modified carboxymethylcellulose na with high stability. Modified carboxymethylcellulose na has a higher degree of substitution and a more uniform distribution of substituents, so that it can be used in a wider industrial production field and a complex use environment to meet higher process requirements. Internationally, this new type of modified carboxymethylcellulose na is also called "polyanionic cellulose".
From this point of view, polyanionic cellulose and carboxymethyl cellulose na are actually one substance, but they have different production standards and different parameters. Generally, the degree of substitution of polyanionic cellulose is greater than 0.90, and its uniformity is better. Polyanionic cellulose is mainly used in petroleum drilling fluids. General industrial grade carboxymethyl cellulose na can also be used in petroleum drilling fluids, which are cheaper, but not as effective as polyanionic cellulose.
Polyanionic cellulose is a high-performance cellulose ether. Its physical and chemical properties are similar to that of carboxymethyl cellulose na, but its comprehensive performance is higher. It can be used to replace carboxymethyl cellulose na in all its applications, especially in high-end market to meet higher process requirements, and the competitive advantage is obvious.