Second, the effect of grinding fineness on the durability of the paint film. Usually the industry experience that the maximum size of the pigment particles should not exceed the thickness of the dry film formed once, if the pigment particles are greater than the thickness of the dry film, the surface of the paint film will show a rough and uneven state, which on the one hand will make the paint film luster decline, and because the pigment particles bulge on the paint film, under the external wind and sun erosion or mechanical force, These protruding particles are more likely to fall off from the paint film, leaving fine pinhole defects on the surface of the paint film, and therefore the water permeation gradually changes to the corrosion-prone center, thereby affecting the durability of the paint film and reducing its protective effect on the substrate.

Third, the effect of grinding fineness on the storage stability of color paint. The paint with fine pigment particles and good dispersion degree is not easy to precipitate and caking during its long-term storage, thus improving the storage stability. However, it should be noted that the grinding fineness of the pigment is not the pursuit of the finer the better, an increase in production costs, the second will also make the adhesion of the film decline, should be based on the different varieties and uses of the paint, the reasonable choice of its grinding fineness. For alkyd, amino decorative requirements of higher enamel, the regulation of grinding fineness is not more than 20μm; For various primers, considering the adhesion performance requirements, the grinding fineness is generally about 50μm.

Sinograce Chemical production of a variety of coatings and top and bottom coating, viscosifying emulsion, welcome to consult.