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play an important role in optimizing film formation to ensure uniform and smooth surface finish. To understand their functioning better, let's first start off with the chemistry behind film formation
How does a Coating Film Formation Takes Place?
Polymer dispersions, used as binders in dispersion paints, consist of particles finely distributed in water. The layers of surfactant and / or colloid, present on the surface of the particles, act as stabilizers, preventing coagulation and provide stability in the dispersed stage. The particles have diameters of about 30 to 500 nm, or even higher in case of course, opaque dispersions.
The film formation process, after application, involves evaporation of the solvent and formation of a continuous polymer film by purely physical means.The film formation of polymer dispersions can be divided into 3 steps: