METHOD OF PRODUCING CERAMIC ALUMINIUM-COBALT OXIDE PIGMENT BASED ON NANO-SIZED MESOPOROUS SYNTHETIC XONOTLITE Russian patent published in 2013 - IPC C09C1/28 C09C1/40 C09C1/00 B82B1/00 B82Y99/00 

FIELD: chemistry.

SUBSTANCE: ceramic aluminium-cobalt oxide pigment is prepared based on nano-sized mesoporous synthetic xonotlite by preparing a reaction solution containing calcium (II), silicate and a high-molecular weight surfactant of the class of quaternary ammonium salts; calcium hydrosilicate is precipitated from the solution while stirring. An aluminium-cobalt phase is then added to the prepared suspension; the formed precursor is separated, washed, dried at 60°C on air and annealed at 800-960°C. The aluminium-cobalt phase is obtained by extracting and concentrating cobalt (II) ions and aluminium from aqueous solutions of salts thereof using monocarboxylic acids and subsequent preparation of an aqueous emulsion of a mixture of cobalt and aluminium carboxylates.

EFFECT: invention enables to obtain environmentally safe, intensely coloured aluminium-cobalt oxide pigments with weight-average particle size of 200-70 nm, having high covering power.

8 cl, 4 ex