Mineral pigments for varnish-and-paint materials and process for producing thereof

Inventia se refera la tehnologia de obtinere a pigmentilor minerali sintetici policromatici pentru producerea vopselelor de grund, de ulei si poligrafice si poate fi aplicata la intreprinderile de producere a vopselelor si lacurilor. Pigmentii minerali pentru materiale de lacuri si vopsele contin un complex mixt de cupru(II)-fier(III) si hexacianura de fier(III)-fier(II) cu formula generala:Procedeul de obtinere a pigmentilor minerali include adaugarea la o suspensie de precipitat de cleire de vin care contine albastru de Berlin, a solutiei de hidroxid de calciu, separarea prin electroflotare a impuritatilor solide, purificarea solutiei care contine albastru de Berlin hidrosolubil cu formula generala Ńŕ{FeIII[FeII(CN)6]}2, tratarea acesteia cu un camp ultraacustic cu frecventa de 20...40 kHz si intensitatea de 1...3 W/cm3 timp de 5...10 min, adaugarea unei cantitati stoichiometrice de solutie a amestecului de sulfat de cupru si sulfat de fier la un pH de 2,5...3,0, separarea reziduului obtinut, spalarea, uscarea si macinarea lui. In calitate de sursa de sulfat de cupru si sulfat de fier se utilizeaza solutiile uzate de la corodarea cuprului la producerea placutelor imprimate pe baza de clorura de fier. Rezultatul inventiei consta in obtinerea pigmentilor minerali cu parametri inalti de dispersie si stabilitate foto- si chimica, cu gama de culori de la blemarin pana la rosu-cafeniu. The invention relates to the technology of obtaining polychromatic synthetic mineral pigments for the production of priming, oil-base and polygraphic paints and can be used at varnish-and-paint production enterprises.The mineral pigments for varnish-and-paint materials comprise a mixed complex of copper (II)-iron(III) and ferro(III)-ferri(II) hexacyanide of general formula CuII-FeIII{FeIII[FeII(CN)6]}2 with the dispersion of 0.05...0.20 µm at a copper and iron ratio of (0.05...0.90):(0.95...0.10).The process for producing mineral pigments includes addition to a suspension of winy adhesive precipitates containing Prussian blue of a calcium hydroxide solution, separation by electroflotation of solid impurities, purification of the solution containing water-soluble Prussian blue of general formula Ca{FeIII[FeII(CN)6]}2, treatment thereof with an ultrasonic field with the frequency of 20...40 kHz and the intensity of 1...3 W/cm3 during 5...10 min, addition of a stochiometric quantity of iron sulphate and copper sulphate solution at a pH of 2.5...3.0, separation of the obtained resid