Registry number: CAS[64294-91-3]; CI 77492

Structural formula: α-Fe2O3•H2O

Molecular Weight: 186.69

 Pigment properties:

Transparent yellow powder. The density is 3.5g/cm3, and the particle size is 0.01~0.02μm. The particles are fine, the specific surface area is large, 10 times that of ordinary iron oxide, it can strongly absorb ultraviolet rays, and has good light resistance and atmospheric resistance. When light is projected onto a paint film or plastic film containing transparent iron oxide pigments, it is transparent.

 Pigment preparation method:

Sulfate oxidation is used. The sulfuric acid and iron are reacted to produce ferrous sulfate, and then concentrated sulfuric acid and sodium chlorate are added for ferrous oxidation, and the produced iron sulfate is neutralized and precipitated with sodium hydroxide, and then ferrous sulfate and iron filings are added for conversion, and then washed, surface treated, filtered, dried and crushed.

Fe+H2SO4 → FeSO4+H2

6FeSO4+2NaClO3+3H2SO4 →3Fe2(SO4)3+2NaCI+H2O

4Fe(OH)2+O2 → 4FeOOH+2H2O

Fe2(SO4)3+6NaOH →2Fe(OH)3+3Na2SO4

3Fe(OH)3 → Fe2O3•H2O+2H2O

Quality standard: enterprise standard

 Use:

Inorganic pigments. It is used in the manufacture of alkyd paint, amino alkyd paint, acrylic paint, etc. It is also used to prepare transparent yellow, transparent red and other pigments, and is coated on reflective substrates such as aluminum foil, electroplating materials, etc., so that the coating has a sense of false gold plating, so that it is widely used in coins, lamps, bicycles, sewing machines, steel furniture, instruments, meters, automobiles, etc. In addition, it is also used in the manufacture of canned interior and exterior wall coatings and inks.