COOLING LIQUID Russian patent published in 2000 - IPC

FIELD: chemical industry, more particularly cooling liquids for internal combustion engine cooling systems, and heat carrier in heat exchangers. SUBSTANCE: described is cooling liquid which, in addition to monoethylene glycol, alkali metal benzoate, sodium tetraborate, sodium nitrite, sodium salt of 2-mercaptobenzthiazole, foam suppressor-based on polysiloxane liquid, further comprises alkali-metal silicate and polyalkylene glycol with molecular weight of 100-400, ratio of components being as follows, wt %: polyethylene glycol with molecular weight of 100-400, 0.1-20.0; alkali metal benzoate, 1.6-3.5; sodium tetraborate, 0.3-1.0; sodium nitrite, 0.06-0.2; sodium salt of 2- mercaptobenzthizole, 0.005-0.02; alkali metal silicate, 0.005-0.06; foam suppressor, 0.002-0.02; colorant, 0.001-0.005; water, 3.0-45.0; and monoethylene glycol, the balance. EFFECT: increased anticorrosion properties and higher resistance to hard water. 3 tbl