Effect of solvent volatilization rate on coating appearance

The volatilization rate of the solvent is the volatilization speed of the solvent, which can control the length of time that the coating is in a fluid state. The evaporation rate needs to be adapted to the formation of the coating (for UV coatings, it needs to match the leveling time of the wet film in the infrared), if it is too fast, it will affect the leveling effect and the time of brushing back, and will cause problems such as blistering and orange peel; Too slow can cause pinholes, air bubbles, sagging and prolonged contact time. "Effect of Solvent Volatilization Rate on Coating Appearance" mainly studies the influence of solvent volatilization rate on coating appearance in UV curing system, and solves problems such as pinholes and spots in the spraying process. The article introduces the specific test process and analyzes the test results.

in conclusion

(1) The solvent with fast volatilization is sprayed to form a film and leveled for 3 to 4 seconds, and then cured. The appearance of the paint film is relatively satisfactory, without pinholes and particles; Outcropping phenomenon, time is difficult to control in industrial production;

(2) Spray the slow volatile solvent to form a film and level it for 3 to 4 seconds, and put it in the infrared for 1 to 4 minutes to cure. The appearance of the paint film is satisfactory, basically without pinholes and particles. However, the appearance is poor due to dust falling for too long, and if the solvent is not volatilized and cured effectively, the paint film will easily turn white;

(3) Single-component solvents and mixed solvents with moderate volatility are used in UV curing spray varnish, and a satisfactory coating can be obtained after infrared leveling (temperature 40-50°C, time 0-4min);

(4) After spraying, the wet film should not be left in the air for too long, preferably not more than 5 minutes.