Easy-to-disperse Trans-Oxide Pigments

1、Product Characteristics

Easy-to-disperse Trans-oxide pigments have basic properties of transparent iron oxide pigmentsand much better dispersibility than transparent iron oxide pigments and especially suitablefor plastics, printing inks and various coatings which have high requirements on environmentalprotection.

2、Codes and technical specifications

Code	TY-615	TR-715
Appearance	Yellow powder	Red powder
Color(compared with the standard)	similar	similar
Relative color strength( Compared with the standard) %	≥98	≥98
Volatile matter at 105°C %	≤3.0	≤3.0
Water soluble matter %	≤0.5	≤0.5
Residue on 325 mesh sieve%	≤0.1	≤0.1
PH of water suspension	7	7
Oil absorption g/100g	35-45	35-45
Total iron-oxide %	80-90	85-95
Heat resistance ℃	160	500
Light resistance	8 grade	8 grade
Acid resistance	5 grade	5 grade
Alkali resistance	5 grade	5 grade

Dispersion Methods

In order to fully exhibit the high transparency and color strength, the Trans-oxide pigments must be dispersed completely. The forces of attraction between particles of small size are high and aggregates formed between the particles are difficult to fully disperse. Ideal dispersion depends on the manufacturing process and the dispersing equipment.

The first stage of a dispersion is to choose proper binders and dispersants to wet the pigment surface and make it to be pre-dispersion system by mechanical equipment and then choose proper milling equipment.

For relatively low viscosity systems, a horizontal bead mill containing glass beads or zirconia beads media is preferred, although ball mills may also be used. Where viscous systems are required, for example pastes or concentrates at high pigment loading, then a three roller mill may be required.

The dispersibility of odorless series umber pigments is better than that of Trans-oxide pigments, which can be dispersed by ball mill, basket type sand mill, three roller mill or horizontal bead mill.

After full dispersion, with the needle lengths of the particles less than 5 µm, the excellent properties of Trans-oxide pigments will be fully exhibited.