COMPOUND FOR PRODUCING STABLE ELECTRIC INSULATING COATING ON ELECTRIC-STEEL SURFACES Russian patent published in 2000 - IPC

FIELD: electrical engineering; insulation of magnet wires for electrical machines and devices. SUBSTANCE: compound incorporating polyvinyl alcohol, orthophosphoric acid, and water is doped, in addition, with urea, thiourea, ethyl alcohol, glycerin, phthalic anhydride, boric acid, and surface-active material obtained by reaction between 1,1,2,2,3,3,4,4,5,5,6,6-dodecaftor-1H-heptane-7-ola and phosphate pentoxide, ratio of ingredients is the following, g/l: polyvinyl alcohol, 50.0-80.0; orthophosphoric acid, 12.0-15.0; urea, 3.0-15.0; thiourea, 0-6.0; glycerin, 0-20.0; ethyl alcohol, 10.0-50.0; phthalic anhydride, 0-6.0; boric acid, 0-5.0; surface-active material, 3.0-6.0; water, up to 1 l volume. EFFECT: improved thermal stability of coating resistant to high-temperature treatment. 1 tbl, 1 ex