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The color changes caused by changes in paint film thickness and pigment content were studied.
apply three spherical blue pigments with different concentrations (0.5%, 2% and 4% (weight)) to the stainless steel substrate at different film thicknesses (310, 490, 730 m) and dry in the oven, while the coating surface is photographed. Record the weight loss caused by the evaporation of the solvent from the
. Measure the color of the dry paint film. Surface-driven conflow is observed in a dry paint film, which causes pigment particles to move.
the thickness of a pigment or coating changes color
the analysis model is used to predict solvent concentration gradients in the paint film and calculate the number of Marangoni to determine the speed of fluid motion. When Marangoni changed hours, all movement stopped. Pigment particles tend to congregate around the edges of the cont flow chamber and produce color changes, especially when the paint film is thin and the pigment content is low.
because a large number of pigment particles increase the reflection of light, increasing the amount of pigment or increasing the thickness of the coating will make the paint lighter color. Paints with high pigment concentrations are less likely to see color changes.
the study was published in Organic Coatings Progress Volume 136, November 2019, 105173.
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