1. The particle size of pigments in paints and the dispersibility of pigments in substrates will affect the gloss of paint films. The finer the pigments are, the better the dispersion uniformity of the pigments in the matrix is, which helps to form a smooth paint film.
2. The ratio of pigment to base in paint has an effect on the gloss of paint film. Because of the weakening of specular reflection of the pigment particles in the paint film, the gloss decreases gradually with the increase of the volume concentration of the pigment (P.V.C).
3. When the ratio of pigments to the base is fixed, the more oil absorption the pigments have, the lower their gloss.
4. Different pigments have different degrees of light absorption and reflection. Because black paint absorbs light completely and white paint reflects light completely, black paint shows higher gloss than white paint.
5. The type of solvent used in paint directly affects the volatilization rate, and too fast or too slow will affect the smoothness of the paint film and reduce the gloss of the paint film.
5. The type of solvent used in paint directly affects the volatilization rate, and too fast or too slow will affect the smoothness of the paint film and reduce the gloss of the paint film.
6. The gloss of the paint film surface depends not only on the smoothness and roughness of the paint film surface, but also on the incident angle of light. The greater the incident angle, the higher the intensity of reflected light.
7. Standard plate is the main benchmark for measuring and calculating the gloss of paint film. It will directly affect the accuracy of sample gloss measurement. Therefore, it should be carefully preserved to prevent surface damage.
8. In the middle gloss area, the relationship between visual gloss and instrument gloss is approximately linear; in the high gloss area, because of the brightness of reflection image, the visual gloss is often lower than instrument gloss; in the low gloss area, because of the different amount of pigment (matting agent) and the roughness of paint film surface, the visual gloss will be higher than instrument measured results.
In fact, the shrinkage and drying speed are not proportional, just as drying only promotes its shrinkage speed, it does not show that the shrinkage rate is large, shrinkage rate and carrier are directly related, but also depends on the carrier, so gloss and fullness are only authorized to the carrier itself.
The influence of pigments, fillers, and solvents is acquired, just like the finer the pigments are ground, the smoother the surface will be, and the higher the gloss will be. In addition, when spraying, the excessive amount of solvents added will lead to too few dry film carriers and affect the gloss.
Slow drying of solvents in the early stage is beneficial to the leveling of coatings, good releasability in the late stage accelerates the drying speed and reduces environmental pollution, which also has a great impact on the gloss.
As far as drying and self-drying are concerned, from the analysis of optical principle, first of all, the gloss is mainly determined by the smoothness of the paint film.
In the case of actual drying, the drying may be smoother than the self-drying film, and the shrinkage rate of the drying film is indeed larger than that of the self-drying paint film, but the drying solvent evaporates faster. Therefore, in the earlier drying process, when the film has not been cross-linked, the faster the solvent evaporates, the more the solid content of the construction increases, and the higher the solid content of the construction, the higher the gloss of the film, the solvent evaporates most, and there is truth in the film. When the solvent is used, the solvent force will increase under heating conditions, resulting in re-leveling. The evenness of the final film may be better than that of self-drying, resulting in a higher gloss.
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