Iron Oxide Yellow
Iron oxide yellow is an important inorganic pigment, the main component is iron oxide monohydrate, chemical formula Fe2O3 · H2O. The following is a detailed description of iron oxide yellow:
1. basic information
Chemical formula: Fe2O3 · H2O
Molecular weight: 177.71
CAS No.: 51274-00-1
Properties: from lemon yellow to brown powder, relative density 2.44~3.60, melting point 350~400 ℃. Insoluble in water, alcohol, soluble in acid. Powder fine, is the crystal of iron oxide hydrate.
2. preparation method
There are two main preparation methods of iron oxide yellow:
Ferrous sulfate oxidation method: ferrous sulfate is generated by the reaction of sulfuric acid and iron filings, then sodium hydroxide is added and air is introduced for oxidation to prepare crystal nuclei, then ferrous sulfate and iron filings are added to the crystal nucleus suspension, heated and blown into air for oxidation, and iron oxide yellow is obtained by pressing, filtering, rinsing, drying and crushing.
Aromatic nitro oxidation method: aromatic amino can be produced at the same time, the reaction equation is Fe H2O R-NO2 → Fe2O3 · H2O R-NH2.
3. Application Areas
Iron oxide yellow because of its excellent tinting strength and stability, is widely used in many fields:
Construction field:
As a pigment or colorant, it is directly applied to indoor and outdoor colored concrete surfaces, such as walls, floors, ceilings, pillars, porches, pavements, parking lots, stairs, stations, etc.
It is suitable for coloring all kinds of building ceramics and glass ceramics, such as tiles, floor tiles, roof tiles, panels, terrazzo, mosaic tiles, artificial marble, etc.
Paints and paints:
Suitable for coloring and protection of water-based interior and exterior wall coatings, powder coatings, etc.
Can also be used for oil paint, including epoxy, alkyd, amino and other primers and finishes.
Can also be used for toy paint, decorative paint, furniture paint, electrophoretic paint and enamel paint.
plastic and rubber:
Suitable for coloring of plastic products, such as thermosetting plastics and thermoplastics.
It is also used for coloring rubber products, such as automobile inner tubes, aircraft inner tubes, bicycle inner tubes, etc.
Other areas:
Widely used in watercolor, oil, paint and other pigments production.
Used as an intermediate of iron oxide pigments, such as the preparation of iron oxide red, iron black, etc.
Can also be used for cosmetics, paper, leather coloring.
4. security and storage
Safety: Although iron oxide yellow is generally considered a relatively safe substance, long-term inhalation of its dust may cause diseases in parts of the body such as the respiratory system. Therefore, it is necessary to wear protective measures such as masks and gloves during use.
Storage conditions: iron oxide yellow should be stored in a dry, ventilated and low temperature environment, avoid direct sunlight and high temperature environment. At the same time, it is necessary to prevent it from contacting the fire source and contacting the oxygen in the air for a long time to avoid spontaneous combustion.
In summary, iron oxide yellow is a yellow inorganic pigment with excellent performance and wide application, which plays an important role in many fields such as architecture, coating, paint, plastic, rubber and so on. At the same time, it is also necessary to pay attention to its safety and stability during use.
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