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替换城市 Principle and influencing factors of special No Foam agents for paints(3)

2023-06-01

Leveling agent is a commonly used coating additive that can promote the formation of a flat, smooth, and uniform coating film during the drying process. A class of substances that can effectively reduce the surface tension of finishing fluids and improve their leveling and uniformity. It can improve the permeability of the finishing liquid, reduce the possibility of spots and stains during brushing, increase coverage, and make the film formation uniform and natural. Mainly surface active agents, organic solvents, etc.

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Most surfactants used in coatings tend to be functionally incompatible with No Foam. In particular, emulsifiers, wetting and dispersing agents, leveling agents, thickeners, etc. can have an impact on the effectiveness of defoamers. Therefore, when coordinating various additives, it is necessary to pay attention to the relationship between different additives and select a good balance point.

Baking temperature

When the paint is baked at high temperature at room temperature, its viscosity will drop at the beginning, and bubbles can move to the surface. However, because of the volatilization of solvent, the curing of paint, and the increase of surface viscosity, the foam will become more stable and retain on the surface, resulting in shrinkage and pinholes. Therefore, the baking temperature, fixing speed, and solvent volatilization rate also have an impact on the effect of defoamer.