What are the effects of solvent volatilization on film?

The volatility of a solvent is an important characteristic next to solvency, and the volatility determines the volatilization rate to a large extent. The evaporation rate of the solvent determines the length of the paint film flow time. The volatilization speed of the solvent needs to adapt to the formation of the paint film. If the volatilization is too fast, the surface of the paint film will dry too fast, which will cause problems such as whitening, orange peel, and bubbling. If the volatilization is too slow, problems such as long dry time to touch, sagging, and pinholes will appear on the surface of the paint film. These problems can be solved by using a mixed solvent. The volatilization speed of the mixed solvent is relatively fast in the initial stage of paint drying, so as to prevent the paint film from sagging and other pathological conditions, but it should be slower in the later stage of paint drying, so that it has enough leveling time. For bake-on finishes, solvent volatility is an important factor in causing blistering, cratering, and pinholes. Solvents have a wide range of evaporation rates and can be selected to improve the application characteristics of a particular coating.