9 ноября, 2015 
Pokraskin Density can be a useful pointer to such properties of a pigment when dispersed in paint as suspension and density of the paint itself. According to Stokes’ law, a pigment particle will settle in paint at a rate proportional to the difference in the densities of the pigment and the medium. Therefore, paints with dense pigments exhibit quick settling during storage. The settling rate can be reduced by compensating for the high density by using a viscous medium and a pigment with low particle size.
A further use of density is in calculating important volume relationships while formulating the paint, such as PVC, which affects many important properties of coatings and volume solids in paint and is used to correlate dry film thickness and wet film thickness. The density of the pigment is primarily dependent on its chemical composition and to some extent on its crystal structure. Generally, inorganic pigments are denser than organic ones, with a few exceptions such as carbon black and iron blue pigment that have lower density than other inorganic pigments.
Опубликовано в рубрике 