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How to solve the floating color phenomenon of water-based paint?
The paint is often needs to add color pastes for tinting. Common pigment pastes like blue, purple, and black tend to float in water-based paints, There is no comparability or reference between the floating phenomenon of water-based coatings and the reasons for the formation of floating colors in oil-based or solvent based coatings.
Addressing the floating color issue of titanium dioxide in water-based systems hinges on the dispersion of the base titanium dioxide. Choosing the right dispersant for base titanium dioxide is essential. Although dispersing titanium dioxide may seem easy and convenient, the chosen dispersant must be capable of integrating with other types of dispersants and surfactants. If different color pastes are used, each with its own type of dispersant, and they are not compatible, this leads to color floating. If the base titanium dioxide is dispersed well and reasonably, and it is compatible with other color pastes or dispersants, then the floating color issue can be resolved.
If there is excessive white floating, it indicates that the dispersion of titanium dioxide is too efficient; if there is excessive black floating, it suggests that carbon black is dispersed too well. The key is to select appropriate dispersants that bring their dispersion capabilities closer together.
We recommend two types of dispersants: one is a high molecular weight polyacrylate type, and the other is a polymer-type surfactant.
Harry@shlasej.net