Iron Oxide Colors In Coatings

Iron oxide pigment is widely used in coatings, paints and printing ink because of its non-toxicity, non-bleeding color, low cost and ability to form various different shades. Coatings are composed of film-forming substances, pigments, fillers, solvents and additives. From the development of oil-based coatings to synthetic resin coatings, all kinds of coatings can not be separated from the application of pigments, especially iron oxide pigments for paints and coatings, which have become indispensable pigments in the coating industry.
Pigments provide two main benefits to any coating: aesthetic and functional. The decorative qualities provided by pigments are important; they are more than just color. They can improve the overall performance of a protective color coating by increasing its durability and adding protection to the substrate. Inorganic pigments have been in the chemistry of coatings for centuries, such as iron oxide in its original natural form.

Why iron oxide pigment can be widely used in paints and coatings

Iron oxide pigment has good heat resistance, stable chemical properties, good resistance to dilute acid, alkali, water, solvent and good weathering resistance.

Iron oxide pigments for paints and coatings are characterized by good weathering resistance, high purity, good thermal stability, good compatibility with other components in the application system, absorption of ultraviolet rays, prevention of degradation of the substrate, and at the same time, they have a protective effect on the coating and are low cost, making them the first choice of pigments for application in paints and coatings. As iron oxide has the characteristics of strong covering power, strong UV resistance and low water absorption, it can enhance the mechanical strength of the paint film, especially in the adhesion with excellent characteristics. At present, iron oxide is widely used in various outdoor paints, road paints, metal antirust primers and topcoats.

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Iron oxide pigments are widely used in coatings, paints, plastics, rubber, ceramics, asphalt, cement and other fields to provide color stability and uniform tinting effect.

Because iron oxide pigments are available in a variety of oxidation states, a wide range of colors can be achieved through different formulations and treatments, from bright to deep.

Iron oxide pigments maintain color stability during the preparation process and do not change color when exposed to heat or light.

Compared to some other pigments, iron oxide pigments are often considered an environmentally friendly choice as they contain no heavy metals or other harmful substances.

$Iron oxide pigments remain stable at high temperatures and are therefore often used in products that are resistant to high temperatures, such as ceramics or refractory materials.$

Iron oxide pigments remain stable at high temperatures and are therefore often used in products that are resistant to high temperatures, such as ceramics or refractory materials.

Iron oxide pigments are widely adopted for their stability, weather resistance and versatility, and their relatively low cost makes them a cost-effective choice for making a wide range of color products.

Iron oxide pigments have excellent weathering resistance, with high resistance to light, chemicals and climate change, and are not easily faded or discolored.

Iron oxide pigments have excellent covering ability, which can effectively hide the color or imperfections of the underlying layer when covering the surface.

Iron oxide pigments are mainly composed of iron and oxygen elements. Depending on the oxidation state, they can be formed into a variety of colors, such as red, yellow, brown and black.

Iron oxide pigments are extremely light stable and can therefore be exposed to outdoor environments for long periods of time without noticeable color fading.

Requirements for iron oxide properties in antirust paints

The iron oxide red used in antirust paint should have a low content of water-soluble salts, which is conducive to the improvement of antirust performance. Especially when ferric chloride is increased, water can easily penetrate into the coating while accelerating the corrosion of the metal.
Metals are very sensitive to acids, so when the PH value of the resin, pigment or solvent in the coating is lower than 7, it is more likely to promote metal corrosion. Iron red paint after long-term exposure, the coating film is prone to chalking, especially the smaller particle size of iron red chalking faster, so in order to improve the weather resistance, iron red pigment particle size the larger the better. But it is easy to make the coating film gloss decrease.

Requirements of top coat on iron oxide performance

The color change of top coat is usually caused by one or more pigment components flocculation, in addition, the poor wettability of pigment, too much wetting agent is also the cause of flocculation. Pigments are prone to flocculation after roasting, therefore, in order to make the color of the topcoat uniform, it is better to use the synthetic iron oxide red produced by wet method. The surface of the coating composed of iron oxide red needle-like crystals is prone to the phenomenon of filigree, and the streaks produced when the coating is observed from various angles are of different shades of color, which is related to the different refractive indices of the crystals.

Different types of iron oxide pigments for paints and coatings

Compared with natural iron red, synthetic iron red has high density, small particle size, high purity, good covering power, high oil absorption and strong coloring power. Both types are used in some paint formulations, such as alkyd resin primers for ferrous metal surface primers.
The heat resistance of iron yellow is a little bit poor, in the heat treatment process will gradually lose the water of crystallization and transformed into red phase, so it can not be used in coatings with high drying temperature. Synthetic iron yellow has strong coloring power, bright color, can be formulated according to the need for a variety of shades of iron oxide yellow, but also has the role of shielding ultraviolet radiation, and can extend the service life of the coating. The application area and dosage of iron yellow in paint are less, often used in combination with other pigments. In the coloring of latex paint, a small amount of iron yellow material can be added to make it beige.
Iron brown and iron black often contain carbon, manganese oxide and other dopants, and the synthetic product is a mixture of iron black, iron red and iron yellow, with strong coloring power and covering power.
Iron oxide brown can absorb almost all of the ultraviolet spectrum, so camouflage coatings made of iron oxide brown on the infrared reflection of the same trees, grass, sand, etc., so that the airborne infrared photography can not be found camouflage. Iron oxide black can be used to formulate primers for metal objects in vehicles and transportation equipment and is easier to grind than carbon black.