Optimizing Rheology for Paint and Coating Applications
White Paper Dec 14, 2015
Malvern Instruments Limited
Paints or coatings, like many commercial products, must be optimized for their end use performance, which for paints and coatings includes leveling behavior, pigment dispersability, sag resistance, applicator loading and film thickness, all of which depend on a coatings rheological behavior. Each of these processes will have an associated shear stress, shear rate and timescale, with temperature another potential variable. For Newtonian materials where viscosity is independent of applied shear stress then temperature is the main variable, however, to provide the requisite functionality most paints and coatings tend to be non-Newtonian, where viscosity is a function of the applied shear stress or shear rate.