Pigment and Nanopigment Dispersion Technologies by Rothon, Roger

By Rothon, Roger

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Often, more binder is added at the end. This is mainly to stabilize the dispersion, but it can also help in increasing the drainage efficiency. In some cases, air pressure is used to force highly viscous or thixotropic mill bases out of the mill. Attrition Mills These are a development of the ball mill in which a static, upright cylinder is fitted with a central shaft with rods or rings attached. The balls (now known as grinding medium) are usually ceramic or steel and can be smaller than in the ball mill.

It also features very high recirculation rates. • MicroMedia Mill. This can use beads down to 20 micron and has been especially designed to produce pigment dispersions for LCD displays (color filters) and highquality ink-jet printing. • Super Flow Pearl Mills. These feature stator-rotor geometry with a hollow rotor that can be cooled to prevent product overheating. The mill features multiple inner and outer chambers and the pigment is first treated and then milled with turbulently flowing media that are separated from the final product by centrifugal forces.

It is generally referred to as the chloride process. The overall reaction is quite simple to write down, but is much more complex in practice. The titanium source is first converted to titanium tetrachloride by reaction with chlorine and a carbon source (usually coke). TiO2 (impure starting material) + 2Cl2 + C → TiCl4 + CO2 The titanium tetrachloride is a gas at the reaction temperature and is cooled on leaving the reactor to liquefy it. It is then purified by distillation. Next, the titanium tetrachloride is oxidized to form titanium dioxide.

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