Study on the High-shear Rheological Properties of the Talc

The high-shear viscosity of the talc using as coating pigment was studied by the high-shear capillary viscometer,the influence of pH value,solid content,dispersant,wetting agent,and particle size distribution on the high-shear viscosity of the talc was also investigated.The high-shear viscosity of talc slurry mixed with the GCC and kaolin was also studied.The results showed that the higher the talc content and the finer the particle size,the higher the high-shear viscosity of its slurry.The impact of dispersant and wetting agent on the high-shear viscosity of the talc is modest.Increasing the pH value is of benefit to reduce the high-shear viscosity of the talc slurry.The high-shear viscosity of talc slurry mixed with the GCC decreases with the GCC particle size reducing.When kaolin is added into the mixed dispersion system of coating talc and GCC,the high-shear viscosity of the system increases significantly,and the high-shear viscosity increases with the decrease of GCC pigment particle size.