The anti-settling effect of fumed silica
Fumed silica is an ideal anti-settling agent. The hydrogen bond structure formed by it is very uniform and stable, and it has a three-dimensional network structure. Therefore, it is very effective to prevent the precipitation of pigments in the coating system. Especially for the color paste system, the appropriate amount of addition will greatly improve the stability of the color paste, and can reduce the amount of wetting and dispersing agent, so as to improve the applicability of the color paste and reduce the influence of the color paste on the coating system. The anti-settling effect of vapor-phase white carbon black is very beneficial to the storage of coatings, especially some pigments such as metal powder and flakes are very easy to precipitate and cannot be completely suspended. The use of vapor-phase white carbon black can ensure that its dispersion is not precipitated, which is significantly improved Can opener performance of paint. Based on the total formula, the amount of fumed silica is in the range of 0.4% to 0.8%, but under special circumstances, such as zinc-rich paint, it needs to be increased to 2%.