Your current location：
Careful control of the preparation process for Genky Transparent iron oxide pigments results in the formation of pigments with very small primary particle sizes. The particles are acicular with needle lengths of up to 43nm and needle widths up to 9nm. Typical specific surface area is 15-150m²/g.
Genky series of Transparent iron oxide pigments exhibit high levels of transparency and color strength combined with excellent chemical stability, weather-resistance, acid-resistance, and alkaline-resistance. Genky Transparent iron oxide pigments are strong absorbers of ultraviolet radiation. As inorganic pigments, they are non-bleeding, non-migratory and insoluble allowing good effects to be achieved in both water and solvent based systems. Genky Transparent iron oxide pigments have good stability to temperature. The red can suffer up to 300℃, and yellow, green, black and brown up to be 160°C.
Genky series of Transparent iron oxide pigments and dispersions have passed the chemical laboratory determination by the international inspection agency SGS-CSTC that no related harmful substances are detected, which meet the latest environmental standards.
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 5μm, the excellent properties of Transparent iron oxide pigments will be fully exhibited.