Rheology of high solid coatings. I. Analysis of sagging and slumping
The rheology of sagging and slumping of high solid coatings on vertical surfaces is analyzed in terms of a non-Newtonian power-law model. The results indicate that, in order to have good sag control and good sprayability at the same time, high solid coatings should be pseudoplastics with a power constant of about 0.6 and a viscosity at 1 sec-1 of about 25 poise at the temperature of interest. This theoretical prediction is confirmed experimentally.