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Methods of Dispersion
In order to fully exhibit the high transparency and color strength, the Transparent iron oxide pigments must be dispersed completely. The interfacial forces between particles of small size are high and aggregates formed between the particles are difficult to be fully dispersed. Ideal dispersion depends on the dispersion process and the dispersion equipment.
The first stage of the dispersion is to choose proper binders and dispersants to wet the pigment surface to make it to be predispersion system and then choose proper milling equipment for grinding.
For relatively low viscosity systems, a bead mill containing glass, steel or zirconia media is preferred, although ball mills or attritors may also be used. Where viscous systems are required, for example pastes or concentrates at high pigment loading, then a triple roll mill may be required.
After full dispersion, with the needle lengths of the particles under 5 μm, the excellent properties of Transparent iron oxide pigments will be fully exhibited.