Iron Oxide Pigment For Paints

Natural iron oxide pigments or iron oxide earth pigments collectively known as iron oxides contain iron oxides and oxide hydroxides. Hematite (α-Fe2O3) is the most common iron oxide found in laterite pigments, with iron hydroxide needle iron ore (α-FeOOH) being the most common. Iron compounds are often found in loess pigments. Amber is a brown earth pigment containing iron and manganese oxides.

Iron oxide pigment can be used in a variety of coatings for coloring protection materials and colors, exterior including water-based coatings, powder coatings, etc.; it can also be used in epoxy resin, alkyd, amino and other coatings and a variety of primers and paints; it can also be used in toy paints, decorative paints, furniture paint, electrophoresis paints, enamels and so on. Iron red primer has anti-rust function, which can replace expensive red lead paint and save non-ferrous metal.

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

Iron oxide pigment has good heat resistance and stable chemical properties. Their resistance to dilute acids, alkalis, water and solvents gives them good weatherability.

Iron oxide pigment for paints and coatings has good weather resistance, high purity, good thermal stability and good compatibility with other components in the application system. It absorbs UV rays and prevents degradation of the substrate. It also has a protective effect on the coating and is low cost. That is why it is suitable for paints and coatings. Due to its high covering power, UV resistance and low water absorption, it enhances the mechanical strength of the paint film and has excellent properties especially in adhesion. Nowadays, iron oxide is widely used in all kinds of outdoor paints, road marking paints, metal antirust primers and topcoats.

Requirements for iron oxide performance in antirust paint

The water-soluble salt of iron oxide red used in antirust paint should be low, which is conducive to the improvement of antirust performance. Especially when ferric chloride increases, 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 easier to promote metal corrosion. Coatings made of iron-red paint are prone to chalking after prolonged exposure. Especially iron red with small particle size is crushed faster. So in order to improve the weather resistance, the larger the particle size of iron red pigment, the better. However, it is easy to make the coating gloss decline.

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

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.

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

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.

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

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

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.

Topcoat Iron Oxide Performance Requirements

Flocculation of one or more pigment components usually causes color changes in topcoats. In addition, poor wettability of the pigments and too much wetting agent are often the cause of flocculation. Pigments tend to flocculate after baking. Therefore, in order to achieve a uniform topcoat color, it is better to use synthetic iron oxide red produced by the wet process. The surface of coatings made of iron oxide red needle-like crystals is easily mercerized. The streaks produced when the painting is observed from different angles. The different shades of color are related to the different refractive indices of the crystals.

Different types of iron oxide pigments for paints and coatings

Compared to natural iron oxide red, synthetic iron oxide red has a higher density, smaller particle size, higher purity, better hiding power, higher oil absorption and stronger coloring power. Both types are used in some paint formulations, such as alkyd primers for ferrous metal surfaces.
Iron yellow is slightly less heat resistant. It gradually loses its water of crystallization during heat treatment and changes to the red phase. Therefore it cannot be used in paints with high drying temperatures. Synthetic iron yellow has higher coloring power and brighter hue. Various shades of yellow iron oxide can be produced as required. It also has the function of shielding ultraviolet radiation. In addition, it can extend the service life of the coating. The application area and dosage of iron yellow in coatings are small. It is often mixed with other pigments. When coloring latex paints, a small amount of iron yellow colorant can be added to make it beige.
Iron brown and iron black often contain dopants such as carbon and manganese oxide. The synthetic product is a mixture of iron black, iron red, and iron yellow with high coloring and hiding power.
Iron oxide brown absorbs almost all of the ultraviolet spectrum, so camouflage paints made of iron brown have the same infrared reflectivity as trees, grass, sand, etc., making it impossible to detect camouflage in the air by infrared photography. Iron oxide black can be used to formulate primers for use on metal objects in vehicles and transportation equipment and is easier to grind than carbon black.