Among the additives, wetting agents and dispersants are surfactants for coatings, and some additives have both wetting and dispersing functions, but there is still a difference between the two in terms of the functions of wetting agents and dispersants themselves. The wetting agent is mainly to reduce the surface tension of the pigment, and the molecular weight is small. The dispersant is adsorbed on the surface of the pigment to produce charge repulsion or steric hindrance, to prevent the pigment from producing harmful flocculation, so that the dispersion system is in a stable state, usually the molecular weight of the dispersant is larger.
