The Effect of Solid Content of Pigment Slurry on Its Low Shear Viscosity

The effect of solid content of pigment slurry on its low shear viscosity is analyzed. The results indicate that the deviation of viscosity concentration is still not acceptable for most of the pigments, although the solid content of pigment slurry is well linear with the reciprocal of the square root of viscosity. Furthermore, the slight fluctuation of solid content which is close to the viscosity concentration can cause significant variation of the low shear viscosity according to the calculation, and result in the uncredible test value of viscosity concentration. High testing precision can be achieved by controlling the viscosity in the lower side when determining the viscosity under the given solid content.