ANTIFREEZE Russian patent published in 1998 - IPC

FIELD: chemical technology. SUBSTANCE: antifreeze comprises, mas.%: 87% orthophosphoric acid, 1.30-1.40; sodium hydroxide, 0.80-1.00; sodium salt of 2-mercaptobentriazole, 0.01-0.05; sodium carbonate, 0.10-0.15; disodium dihydrous salt of ethylenediaminetetracetic acid, 0.03-0.07; foam suppressor, 0.02-0.03; dye, 0.002-0.003; water, 0.85-1.5; inhibitor of corrosion of non-ferrous metals, 0.02-1.1; ethylene glycol or polyglycols, the balance. Inhibitor of corrosion of non-ferrous metals comprises (as calculated for antifreeze), mas. %: sodium metaphosphate, 0.05-0.10 or caprolactam, 0.02-0.10; or carbamide, 0.010-0.30; or benztriazole, 0.20-0.30; or inhibitor of atmospheric corrosion, or mixture thereof at any combinations and at any ratio. Hexametaphosphate or sodium polyphosphate are used as metaphosphate. EFFECT: improved anticorrosive characteristics. 3 cl, 3 tbl