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When the particle size of iron oxide red is 0.2μm, the particle size is yellow, and the specific surface area and oil absorption are also large. When the particle size increases, the hue moves from red to purple. The specific surface area and oil absorption also become smaller. Iron oxide red is widely used in antirust coatings with physical antirust function. Water in the atmosphere cannot penetrate into the metal layer and can increase the compactness and mechanical strength of the coating.
Micaceous iron oxide: The iron oxide used as antirust pigment is mainly micaceous iron oxide. At present, the fine powder screened by natural minerals is widely used, showing flaky crystal and heat resistance can reach more than 800 ℃. Early Britain made use of Australian natural products and processed into high-durability anti-corrosion coating, which has achieved good results in bridges and steel frame structures. For example, Sppndon Bridge, Paris Tower, Japan's Kobe Bridge, Guanmen Bridge, the fourth contact bridge, etc. are all coated with mica iron oxide coating. The former has good durability during 20 years, which can save a lot of maintenance costs and is valued by relevant countries. After the synthetic product was developed in the 1960 s, it broke the monopoly of natural products and surpassed natural products in purity, particle size distribution, crystal form, heat resistance and other aspects. Coatings made of micaceous iron oxide have the following characteristics: ① good film formation, ② excellent adhesion and connection characteristics, ③ resistance to air pollution and ultraviolet light without radiation, ④ excellent durability, ⑤ easy coating into thick film and so on.
The iron oxide red water soluble salt applied to the antirust paint is low, which is beneficial to improve the antirust performance, especially when the chloride ion increases, the water easily penetrates into the coating, and at the same time accelerates the corrosion of the metal. In addition, metal is very sensitive to acid, so when the PH value of resin, pigment or solvent in the coating is below 7, it is easier to promote metal corrosion. After long-term exposure, the coating of iron oxide red paint is easy to produce chalking phenomenon, especially iron oxide red with smaller particle size is faster, so iron oxide red with larger particle size should be selected to improve weather resistance, but it is also easy to make the coating gloss drop iron red has better heat resistance, but also suitable for application for powder coating coloring. Iron red perchloroethylene primer is used in painting, which is first mixed with iron red, perchloroethylene resin, plasticizer (dibutyl phthalate), low barium carbonate and filler (barium sulfate and talcum powder), then rolled into paint pieces on a mixing machine, dissolved by solvent, phenolic resin and alkyd resin are added, and the paint is mixed and filtered. Iron red in the application of latex paint also has a broad future, to replace solvent-based coatings and oil-based coatings, coating in a variety of building structures.
Iron oxide brown and iron oxide black: they have higher tinting strength and hiding power. The heat resistance of iron brown and iron black is lower than that of iron red. Iron black is oxidized to generate brown γ-Fe2O3 in air above 180 ℃, and turns to α-Fe2O3 (red) above 350 ℃. Iron brown can absorb almost all the ultraviolet spectrum, so the camouflage paint made of iron brown has the same infrared reflection as trees, grass, sand, etc., so that the infrared photography in the air can not determine the camouflage, iron brown has played a positive role in this regard, and has been widely developed!