| Résumé : |
A theory that explains the mechanism by which pigments affect the gloss of paint films was strengthened and expanded. Immediately after paint is applied, surface tension of the wet film maintains its surface at molecular smoothness and gloss at perfect distinctness-of-image. While the film dries or cures it shrinks from loss of solvent or condensation products. Pigment particles and, if present, resin droplets, come together, interact and develop structure within the wet film. Eventually, the compressive strength of this structure in the film overcomes the surface forces. As the film continues to shrink, its surface becomes rough, degrading distinctness-of-image gloss. Experimental data and theoretical argument are presented that show that effects are proportional to pigment particle size. |
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Gloss of paint films : II. Effects of pigment size in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)
