Improvement of Color Strength by Dry Milling of Colored Pigment in the Presence of Extender Pigment

Abstract

The color strength is one of the most important performances in paint and ink industries. The color strength can be improved by the improvement of pigment dispersibility in paint with reduced diameter of the primary pigment particle. In this paper, dry milling of the colored pigment in the presence of extender pigment for better pigment dispersibility and higher hardness was studied.
Consequently, color strength was sharply improved by using this technique. Dry milling of colored pigment was promoted by extender pigment, and ultra fine colored pigment particle was prepared, which resulted in higher the color strength. The effect of the extender pigment on the dispersibility of the colored pigment was not found in this examination.
From the observation of the paint film with transmission electron microscope, the pigment particle size and the pigment dispersibility were found to be evaluated individually.