Technical Information--Tran-Oxide Pigments

Careful control of the preparation process for Trans-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 is 105 -150m2/g , and hence, for inorganic pigment , have relatively high oil absorption figure. All of the Trans-oxide pigment range exhibit high levels of transparency and color strength combined with excellent chemical stability, acid-resistance, and alkaline-resistance , as inorganic pigment, they are non-bleeding,non-migratory and are not soluble allowing good effects to be achieved in both water and oil based systems.
Trans-oxide pigment have good stability to temperature , the red can suffer up to 300 °C, and yellow, black , green , and brown up to be 160°C.

Trans-oxides are strong absorbers of ultraviolet radiation . The higher the degree of dispersion to expose the maximum surface area of the pigments , not only improve the transparency of the paint film , but also allows for a high level of absorption of the damaging UV light.
The color shade nuances of  Trans-oxide pigments can be obtained by changing the manufacturing process to influence particle shape with high surface areas.So we can offer Trans-oxide pigments with subtle nuances of color shade.

According to the X-ray analysis to our pigments , the contents of Pb , Sn , Cd are under 100ppm , which meet the EN71 (1994) Part 3 specification and proves our products are high quality environmentally acceptable materials.

Applications Trans-oxide pigments are mostly used in automotive paints and wood finishes. Meanwhile they are also widely used in the areas of construction paints, industrial coatings , plastic , nylon , rubber,print ink, art coatings, cosmetics and powder coatings.
The excellent weather fastness, UV absorption properties,high transparency and color strength makes Trans-oxide to enrich the colors , increase color shades when combined with organic pigments and dyes and improve the condition of poor weather fastness when organic pigments and dyes are used alone without Trans-oxide pigments.

Automotive Paints Trans-oxide pigments give the stylist the ability to improve durability , transparency and UV absorption of the paint. So they are widely used in automotive paints and in conjunction with aluminum and pearlescence to produce metallic and golden yellow finishes. At the same time , significant cost benefits by allowing cost effective color stylings in combination with more expensive organic pigments can be achieved.

Transparent yellow iron oxide is used in combination with phthalo cyanine pigments to achieve gold to green shades, while transparent red and brown iron oxides can be combined to blue shade reds and maroons.

Wood Coatings The ultraviolet component of sunlight is principally responsible for the degradation of wood. Trans-oxide pigments are strong absorbers of UV radiation providing protection for the wood while their color and transparency enhances the appearance of the natural wood grain with a soft color. The high durability and weather fastness of Trans-oxide pigments make them the natural choice for wood stains and furniture finishes.

Plastic Application There is a growing requirement for the use of Trans-oxide in plastic application .Owing to its properties of high transparency and color strength and strong absorption of UV, for example , when we use them as the coloring matter of transparent plastic containers , they can also work as UV radiation absorber which can protect the goods in the containers from UV radiation.They can be applied in PET or PP for drinking cans and medicine bottles.

Industry Coating Coatings containing Trans-oxide pigments can produce attractive gold and copper effects when applied over metal.
Trans-oxide pigments are suitable for cosmetics and both exterior and interior coating system and children toys.

Print ink The transparent iron oxide is as bright as similar organic pigments and transparent dyestuffs, which is suitable for printing of aluminum tube. Due to successful application of car coatings, it may be used in preparation of metallic paints.

Art coatings Art coatings including metallic paints (water or oil dispersion), scaly figure paint and hammer paint, may keep the art colors for long period due to the high durability property of transparent iron oxide.

Cosmetics Because transparent iron oxide is non-toxic and has a high UV ray absorption, it is applicable in cosmetic industry (water dispersion).

Powder coating Transparent iron oxide is able to keep colors unchanged in 5-20 minutes under 130 -200 ℃, so it may be used in powder coating.

Methods of Application 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 equipment.

The first stage of a dispersion is to choose proper dispersants and solvent to wet the pigment surface to make it to be predispersion system and then choose proper equipment.

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 Trans-oxide pigments will be fully exhibited.

We can supply fully dispersed pigment dispersions in both water-based and solvent-based systems.

Transparent Iron Oxide Pigments