Impact Of Dispersant Chemistry On Pigment Suspension Behavior: Linking Acid Number, Molecular Weight, And Environmental Stability

Abstract

Pigment suspensions for many uses, including paints and inks, must be sensitive to the dispersant properties. The acid number to molecular weight ratio (AN/MW) is accepted as an important molecular descriptor of dispersants in determining dispersion efficiency. Pigment suspensions in the AN/MW ratio, dispersion stability, and rheology are all highlighted in this overview. This paper tries to provide a clear and complete insight into the physicochemical processes involved by studying how changes in this ratio affect particle-particle interaction, flocculation resistance, and viscoelasticity. The literature evidence shows that by merely optimizing this ratio, pigment dispersion quality can be improved, pigment aggregation can be reduced, and favorable rheological properties can be attained for both processing and application.