Pigments are predispersed in resins to produce predispersed pigments , and it could be done in an aqueous medium in a ball mill using steel balls , However the balls need to be protected from corrosion .How could this be done
There are ceramic grinding balls made of Al2O3. This balls are harder than steel ball and do not corrode.
If you want maximum density, there are balls from hard alloy (WC-Co) with a density of 15-16 g/cm3. These balls also do not rust.
I not sure that specific gravity is a critical parameter in the process, to some extent.
Thus I have thad he same proposal as Vadim, i.e. using ceramic materials and why not silicon nitride (Si3N4) which is very resistant and does not corrode. Moreover Si3N4 balls are used in some rolling element bearings, meaning that they are available.
You could possibly consider to add about 10―15 g/L of sodium benzoate to the aqueous medium, as corrosion inhibitor, to prevent possible corrosion of the steel balls.
Dear Asit:
I have taken the approximate concentration guideline suggested at above post from: Gösta Wranglén, "An Introduction to Corrosion and Protection of Metals", Institut för Metallskydd, Stockholm, 1972, p. 160.
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