During the process of the paint mist flying to the workpiece and forming a film on the workpiece, the solvent volatilization in the paint mist has an important influence on the spraying effect. During the process of flying from the Spray Gun to the workpiece, the volatilization rate of the solvent contained in the paint must be appropriate. Too fast or too slow is not good. The film contains too much solvent and sags. The factors that affect the solvent evaporation rate are as follows.
(1) Physical properties and quantities of solvents and thinners used in coatings
Some solvents and diluents can volatilize quickly, while some volatilize slowly, so solvents and diluents with appropriate volatilization rates should be selected. And the amount of solvent contained should also be appropriate, too much or too little will affect the sagging or leveling of the coating film.
(2) Atomizing air pressure
If the atomizing air pressure is too large, the solvent volatilization rate will be too fast, and vice versa, the volatilization rate will be slower, so generally an appropriate atomizing air pressure should be selected.
(3) Ambient temperature in the spraying area
Solvent volatilization is an endothermic process, and high ambient temperature is conducive to solvent volatilization, so the solvent volatilization rate is different in different seasons. When the ambient temperature is low in winter, the method of heating the coating can be used to increase the volatilization rate of the solvent.
(4) The degree of atomization of the paint
The degree of atomization is high, and the dispersion is fine, which is conducive to the volatilization of solvents.
