Floating color is a color paint blended with pigments with large density differences, and it is easy to produce pigment distribution in the upper and lower layers, making the surface of the coating film inconsistent with the color tone of the interior. Such as gray paint modulated by carbon black_titanium dioxide, light blue modulated by Oushu blue_titanium dioxide, etc. When the wet paint film dries, the uneven evaporation of the solvent causes the surface to have a poor surface tension and cause convection, which is the driving force for the floating color. therefore. The solution to floating colors is:
(1) Reduce the density difference of pigments and improve the dispersion performance of pigments;
(2) Add a little silicone oil additive, the thin layer of silicone oil with low surface strength can avoid the surface tension difference caused by solvent volatilization, thereby eliminating the convection phenomenon, which is effective in preventing color floating.
Bleeding is when the color of the base layer is dissolved into the top coat, causing the color of the top layer to stain and change color.
(1) The bottom layer contains organic pigments with poor solvent resistance, which are dissolved and infiltrated by the topcoat solvent. Due to the poor solvent resistance of asphalt paint, the black paint base is also easily dissolved into the upper paint film and stained black.
(2) When the colored wood is painted, the coloring dye is easily dissolved and penetrates into the finish paint.
(3) The topcoat contains a solvent with too strong solvency, and the topcoat is applied if the bottom layer is not dry enough.
A better solution to bleeding is to spray a sealer coat. Hard resin coating films containing high pigments and fillers, or filled with flaky pigments and fillers, generally have better sealing properties.