Iron oxide pigments are found in nature as mineral deposits. There are actually three types of iron oxide pigments which are obtained in nature as mineral deposits. They're limonite, hematite, and magnetite. In addition to the natural mineral deposits, iron oxide pigments can be acquired synthetically. In general, the naturally occurring iron oxides tend to be weaker and dirtier in color than their synthetic alternatives due to impurities in the oxides. The natural pigments are opaque or semi-opaque because of their coarse particle size. The synthetic pigments minimize these disadvantages.
Iron oxide pigments are getting to be increasingly important on account of their chemical stability, the absence of toxicity and their wide color spectrum which range from yellow via orange, red and brown to black. When dispersed in paints and printing inks, such pigments are distinguished by high transparency when used in full strength. However, iron oxide pigments suffer from a servere disadvantage in that they are very hard-grained, i.e. they can only be dispersed with great difficulty in the media to be employed. This poor dispersibility or grain hardness, which has formerly been characteristic of transparent iron oxide pigments which give a pure hue, could be influenced to only a very slight degree, if at all, by measures taken during synthesis of the pigments.
One type of synthetic iron oxide pigments which are coloristically distinctive are the relatively pure iron oxide pigments produced by solution reactions. These pigments are commonly referred to as transparent iron oxide pigments. Iron oxide pigments which has an average particle size of less than 0.1 micron are termed transparent iron oxide pigments because they transmit visible light. Explained in another way, "transparent pigment" is pigment having a majority of the particles smaller than the wave length of light. The pigments which have an average particle size greater than 0.1 microns and which cannot transmit light are considered to be opaque. Due to their small particle sizes, nanometer transparent iron oxide pigments are totally different from the opaque iron oxides in aspect of light absorption and scattering. They exhibit an advanced level of transparency caused by the instinctive crystalline structure of the pigment and fine crystallite size resulting from the method of manufacture. Transparent iron oxide pigments are powerful absorbers of ultraviolet radiation. The higher the degree of dispersion to expose the maximum surface area of the pigments, not merely enhance the transparency of the paint film, but additionally makes it possible for a high level of absorption of the damaging UV light. These pigments have good stability to temperature, the red one can suffer up to 300, and yellow, black , green , and brown up to be 160.
Transparent iron oxide pigments are principally used in the creation of automotive effect lacquers, wood varnishes and for coloring transparent plastics, coloring of paints, printing inks, films, building materials, cosmetics and the like. Theyare typically applied in coating applications requiring high transparency while maintaining an appropriate resistance to UV degradation of the organic binder upon prolonged exposure to natural sunlight.
Transparent iron oxide pigments, which are extensively used in automotive metallic finishes, are generally yellow or red. The metallic effect depends on the degree of transparency of the pigment. The use of these pigments in coating compositions used in particular for external surface finishes for automobiles and trucks provides the finish with high transparency, glamour and aesthetic quality. Transparent yellow iron oxide can be 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. Transparent yellow iron oxide pigments are produced by precipitation with an alkaline solution from water-soluble iron salts both ferric and ferrous, followed by filtration, washing and drying thereof. The transparent red iron oxide pigments are produced by calcining transparent yellow iron oxide pigments.
The ultraviolet component of sunlight is principally responsible for the degradation of wood. Transparent iron 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. The high durability and weather fastness of Trans-oxide pigments make them the natural choice for wood stains and furniture finishes.
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.
Coatings containing transparent iron oxide pigments can produce attractive gold and copper effects when applied over metal.
Our transparent iron oxide pigments exhibit high levels of transparency and color strength in addition to excellent chemical stability, acid-resistance, and alkaline-resistance. The excellent weather fastness, UV absorption properties, high transparency and color strength makes our 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 pigments and dyes are used alone without Trans-oxide pigments. Our transparent iron oxide dispersions (TRAFe) can be applied in both solvent-borne (SBA, LSB) and water-borne (CSEW, CSBW) systems. SBA solvent-borne dispersions exhibit high compatibility with acrylic acid, polyester, polyurethane, silicone, fluoro 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 well suited for long-oil alkyd, plant oil, etc, in low polar systems.
Our products include waterborne, water and oil borne pigment powder, and waterborne, solvent-borne pastes in the colors of yellow, red, blue, green, black and brown.
Shangyu Chuangjia Chemical Co., Ltd.
Mr. Libin Zhong
No.19 Wei 11 East Road, Fine Chemical Zone, Shangyu, Zhejiang 312300, China
0086 575 82122083
0086 575 81229655