Iron blue pigment, procedures to prepare it and utilise it

Details Iron blue pigment, procedures to prepare it and utilise it Iron blue pigment, procedures to prepare it and utilise it

C - Chemistry, Metallurgy

09

D

6/210, 6/23

C09D 11/00 (2006.01) C01C 3/12 (2006.01) C09C 1/26 (2006.01)

Patent

CA 1165510

ABSTRACT OF THE DISCLOSURE An iron blue pigment ("DIN 55 906") is prepared by pre- cipitating white paste and then oxidizing the white paste. Alkali metal ions such as sodium ions and potassium ions, cyanide or hexacyanoferrate(II) ions, and iron(II) ions are used as starting materials. The iron blue pigment of the invention contains potassium in an amount between 0.5 and 4.5% preferably between 0.5 and 2.0% by weight, sodium in an amount between 0.1 and 1.0% by weight, ammonium in an amount from 2.0 to 4.5% by weight, pro- ferably between 3.0 and 4.5% by weight, has a tinting strength, when tested in accordance with "DIN 52 204" and "DIN 53 234" exceeding the tinting strength of "Vossenblau 705" the German colour standard for iron blue pigments by between 5 and 15%, and has colour differences (determined in accordance with "DIN 53 204" and "DIN 53 234" in combination with "DIN 6174" with "Vossenblau 705" as standard) which are: .DELTA.L : - 0.7 to -1.5 .DELTA.a : - 0.5 to 1.5 .DELTA.b : - 0.6 to -2.3 .DELTA.C : 0.5 to 2.0 To save potassium ions in the preparation of iron blue pigments, of the invention, the precipitation of white paste is done in two stages. The alkali metal ions which are used in the pre- cipitation of white paste are: potassium ions in the first stage and sodium ions in the second stage. The soluble byproducts of the reaction are then removed, ammonium salts are added, and the white paste obtained in this manner is aged and oxidised thereafter in a conventional manner and recovered as an iron blue pigment. The iron blue pigment can be utilised as pigment in the preparation of printing inks, paints and enamels, and as a colourant in fungi- cides.

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