Cellulose thickeners The thickening efficiency of cellulose thickeners is high, especially for the thickening of the aqueous phase; there are few restrictions on coatings and coatings, and they are widely used; the pH range that can be used is wide. But there are shortcomings such as poor leveling, more splashing during roller coating, poor stability, and susceptibility to microbial degradation. Because of its low viscosity under high shear and high viscosity under static and low shear, the viscosity increases rapidly after coating is completed, which can prevent sagging, but on the other hand, it causes poor leveling. Studies have shown that the relative molecular mass of the thickener increases, and the splashability of the latex paint also increases. Cellulose thickeners are prone to splash due to their large molecular weight. This type of thickener achieves the thickening effect through "fixed water", and has little adsorption on pigments and latex particles. The volume expansion of the thickener fills the entire water phase, squeezing the suspended pigments and latex particles to the side, which is easy to cause flocculation , So the stability is not good. Because it is a natural polymer, it is vulnerable to attack by microorganisms.
Polyacrylic thickener Polyacrylic thickener has strong thickening and good leveling, good biological stability, but is sensitive to pH and poor water resistance.
The association structure of associative polyurethane thickener is destroyed under the action of shearing force, and the viscosity is reduced. When the shearing force disappears, the viscosity can be restored and the sag phenomenon can be prevented during the construction process.
