1. Transparent Iron Oxide Overview
Although nanometer transparent iron oxide is a kind of inorganic pigments
in view of its synthetic and performance characteristics, it also owns
properties of organic pigments. And transparent iron oxide belongs to
nanometer crystals, because its particle size is
Iron Oxide Pigment Series
much smaller, only 0.01-0.015цm, compared with opaque one. The small
size of nanometer crystals gives transparent iron oxide large specific
surface area (about 128m2/g), which results in its high oil
absorption, (up to 80-100), by comparison, phthalocyanine blue 56, phthalocyanine
green 46, carbazole violet 84, opaque iron oxide 18. Since the particle
diameter of transparent iron oxide is smaller than half light wavelength,
it has transparent colors when scattered in the media and made into
successive films. Moreover, due to its tiny particle diameter, nanometer
transparent iron oxide is totally different from the opaque one in aspect
of light absorption and scattering, thus it has vivid colors instead
of dark colors performed by opaque iron oxide.Iron
oxide nona particles, nona-structured iron oxide
Advantages of using Transparent Iron Oxide
- UV absorption : Transparent iron oxide pigments are effective absorbers
of ultraviolet radiation, providing essential protection to resins
and many substrates. The inclusion of these pigments, even at low
levels, ensures significant protection against degradation resulting
from UV exposure
- Stability: Both acid and alkali resistant, TRAFe™ pigments
demonstrate outstanding weather fastness and gloss retention qualities.
Yellow iron oxides exhibit thermal stability of approximately 160℃.
Red grades, being a dehydrated form of yellow iron oxides, having
undergone a calcination process at low temperatures, display higher
thermal stability of around 300℃.
- Excellent transparency and weather fast colors for interior and
exterior use: light fastness, weather fastness & durability.
- Excellent chemical stability: Can be used in combination with organic
transparent pigments in both solvent and water borne systems
Application of Transparent Iron Oxide
Automotive Paints: used with aluminum pigments and pearl powder in
the oil and water based systems to produce golden colors and used
with organic transparent pigments to produce various transparent paints.
|Transparent Iron Oxide Pigments
- Wood protection: soft color, no fading, prevent ultraviolet radiation
from damaging the wood.
- Powder coatings: coats on metal surface to produce gold or copper
color, widely applicable for inner and outer coating of cans.
for transparent iron oxide red, no change in color when the temperature
is under 300℃
- Printing inks: vivid transparent colors suitable for the printing
of aluminum foils.
- Decorative coatings: color can be kept for long periods of time
- Plastic packing: used in PET or PP plastic to make drinking cans
and drug bottles.
- Cosmetics: widely applied in the cosmetics industry because it is
toxin-free and has an excellent absorption capability to ultraviolet
2. Transpare Iron Oxide Dispersion Overview
“TRAFe” Transparent Iron Oxide Dispersions, with color of yellow, red,
Iron Oxide Dispersion Series
blue, green, black and brown, can be applied in both solvent-borne (SB,
LSB) and water-borne (SBW) systems. SB solvent-borne dispersions are resin-free,
displaying high compatibility with acrylic acid, polyester, polyurethane,
silicon , efluoro and vinyl ester resins in high and middle polar systems.
It is especially suitable to be applied in automobile and industrial paints.
LSB type dispersions are especially suitable for long-oil, medium-oil
and short-oil alkyd, plant oil, etc in low polar systems. It is specially
recommended to be used in wood coatings. SBW water-borne dispersions contain
no resins and flux, and possess high compatibility and fluidity. They
are specially recommended to be used in water-borne alkyd, polyurethane
and water-borne acrylic acid and polymer emulsion based water-borne systems.
The “TRAFe” dispersions exhibit high levels of color strength, transparency
and UV absorption properties combined with excellent weather fastness,
heat durability and alkaline-resistance. They are widely applied in high
quality automotive paints, wood finishes, construction paints and industrial
If particles form when add transparent iron oxide dispersions into binder,
the result is caused by the fast reaction between the dispersion and viscous
binder. The method to avoid the problem is to take the following steps.
Nona-structured Iron oxide pigments
- Take certain quantity of transparent iron oxide dispersion, and
add solvent or water is into it to lower dispersion’s viscosity. The
quantity of the solvent or water need to lower the pigment loading
in the dispersion within 10%.
- Take right amount of bi nder, which is 5%-10% of the dispersion
quantity, and add it into the above dispersion slowly while stirring
in order to obtain low concentrated solution. Stir slowly and add
the above obtained low viscous solution into the remaining binder.
Storage and Caution
The dispersions should be stored in well-sealed containers at a temperature
under 35℃ and the storage period should not exceed 12months. The dispersions
should be stirred evenly before being used and should be used up as soon
as possible after unpacking. As for LSB type dispersion, when the storage
temperature is above 35℃,volatility of solvent or the chemical reaction
of the binder may cause formation of a skin on the surface of the dispersion
and the skin should be removed before use.