Studies of sedimentation behaviour of high pigmented alkyd primer: A rheological approach

These rheological studies are carried out to understand the sedimentation tendency of pigments in solvent borne alkyd primer (SP). Three high pigment volume concentration (PVC) primers with varying wetting agents are studied comparatively with benchmark low PVC primer with good antisettling performance. Rheological tests namely control shear rate (CSR), creep recovery, oscillatory amplitude sweep and frequency sweep were performed on these samples and correlation with natural and accelerated stability tests was established. Here the correlation of rheological parameters like yield stress, crossover point, zero shear viscosity, deformation, loss factor, etc. with the respective pigment sedimentation tendencies in primer samples gave good understanding of their importance in primer formulation. This not only helps making better primer but also reduces development time for a product and thus improved productivity.

► Preparation of high pigmented alkyd primer.
► Investigation of pigment sedimentation behaviour using accelerated and natural stability test.
► Rheological characterization of high pigmented alkyd primer.
► Correlation of rheological properties with the accelerated and natural stability test results.