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Application of wetting agent in water-based resin coating

Mar 19, 2020

The development of wetting agents, flocculation is a common phenomenon in coatings, especially for organic pigments with large specific surface area. It is the evacuation combination of primary particles that can be opened by weak shear force, but when the flocculation is further intensified It often leads to delamination and agglomeration of the paint, resulting in loss of gloss, reduced hiding power and adhesion, poor flexibility, and poor water resistance. When the pigment particles are well wetted by a suitable wetting agent, the surface of the pigment is covered by the adsorbed wetting agent, which can significantly reduce the effective density of the pigment, make it close to the density of the paint, and significantly reduce the appearance 1. Flocculation and sedimentation of fillers. By selecting the appropriate wetting agent and the appropriate amount of addition, it can solve the problems of sedimentation and flocculation; if a wetting agent can wet two pigments, it can solve the problem of flowering. However, when too much wetting agent is added, it is easy to produce two drawbacks: one is to reduce the water resistance of the paint film; the other is to destroy the thickening effect of the associative thickener. In severe cases, it may even cause the pigment and filler to settle again Or flocculation.