METHOD FOR PRODUCING GREEN PIGMENT BASED ON ZINC OXIDE DOPED WITH COBALT Russian patent published in 2023 - IPC C09C1/04 C09C3/04 C01G9/02 B82Y40/00 

FIELD: pigments.

SUBSTANCE: method for producing a green pigment based on zinc oxide doped with cobalt involves processing a solution of a mixture of zinc nitrate hexahydrate and cobalt nitrate hexahydrate, taken in the ratio, mol.: Zn⁺²:Co⁺² =(0.99-0.75):(0.01-0.25) in formic acid followed by annealing. In the case of using 99.7% formic acid, the treatment is carried out at the following metals ratio, mol.: (Zn⁺²+Co⁺²):HCOOH=1:2.2, by holding the solution until the spontaneous reaction begins to obtain lilac powder after the end of the reaction. In the case of using 20% formic acid, the treatment is carried out at the ratio, mol.: (Zn⁺²+Co⁺² ):HCOOH=1:2.1, by heating the solution to a temperature of 40-50°C and holding it at this temperature for 1.5-2 hours until a dry residue is obtained in the form of a pink powder. The resulting powders are annealed at a temperature of 800-900°C for 0.5-1 hour.

EFFECT: ability to produce a wide range of shades of green pigment from light green to dark green in a simple and environmentally friendly way.

1 cl, 2 dwg, 5 ex