Sodium Carboxymethyl Cellulose, usually referred to as Sodium CMC or CMC, has been widely used as thickener, stabilizer and protective colloid in the painting industry because of its excellent properties. Let’s talk about the application of CMC used in ordinary paints.
The macromolecular chain of CMC with hydroxyl group hydrates with water and produces entanglement at the same time, thus increasing the viscosity of water phase. As a result, CMC has good compatibility in water or organic solvents, and has good compatibility with pigments. This can greatly improve the viscosity and rheology of paints, so CMC is often used as thickener, dispersant and stabilizer in the painting industry. The specific effects of CMC in the application of water-based paints are as follows:
- It has good water resistance and can improve the durability of coating film;
- It makes the coating film with high fullness and uniform;
- It can act as a stabilizer and prevent coating separation due to rapid temperature changes;
- It can act as a protective colloid and can maintain the stability of coating systems in a wide range of pH values;
- It can act as a thickener, make the coating uniform, achieve ideal preservation and construction viscosity, and avoid serious separation during storage period;
- It can improve the leveling of coating, improve coating splash resistance, flow resistance, so as to improve the construction performance of coating;
- It can also make the pigment, filler and other additives evenly dispersed in the coating, so that the coating has excellent color attachment effect.
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