OPTIMIZATION OF DISPERSANT AND LIQUID LEVELS IN COLOR PIGMENT CONCENTRATES

摘要

The dispersion of organic and inorganic pigments for the manufacture of a color mill base (CMB) or a color pigment concentrate (CPC) requires the use of a dispersant. Much has been written about the use of specific dispersants to make CMBs or CPCs, and suppliers recommend rather wide use ranges (e.g., 20 -150% dispersant based on pigment weight for carbon black). Formulators need to optimize the dispersant level to insure dispersion stability, minimum viscosity, and full color development when the CMB or CPC is added to a coating. Sufficient liquid is needed to fill the interstitial volume between dispersed pigment particles. A Liquid Dispersant Flow Point Method (LDFPM) is proposed to determine the optimum levels of dispersant and liquid for a pigment/dispersant combination. The objective is a CPC or CMB with a maximized pigment concentration. Viscosity and colorimetry are used to determine the extent of dispersion.