The higher the degree of substitution, the more the number of anions (-OCH2COONa) on the sodium carboxymethyl cellulose CMC and the polyanionic cellulose PAC molecule, and the more stable the performance.
The higher the degree of substitution of polyanionic cellulose PAC and sodium carboxymethyl cellulose CMC, the relative reduction of unsubstituted units in the molecule.
CMC and PAC with high degree of substitution are more stable in application.
The stability of CMC and PAC products with too low substitution is slightly poor, which is characterized by large amount of sedimentation, poor viscosity stability and poor fluid loss resistance.
Replacement of CMC and PAC with good uniformity and good product quality, which is embodied in the good appearance and fluidity of the product, the high transparency of the product after dissolving in water, and the good acid resistance, heat resistance, salt resistance and thixotropy.