Rheology of high solid coatings. I. Analysis of sagging and slumping

Abstract

Abstract 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.