concentrado de lubrificante refrigerador miscÍvel em Água, bem como seu uso

Described is a water-miscible cooling lubricant concentrate which comprises natural or synthetic mineral oils, emulsifying agents, corrosion protection additives, solubilizers, means of preservation, metal inhibitors and other conventional additives, and, after dilution to form a 2 to 25% by weight aqueous solution, has a pH value between 7.0 and 7.5 as well as additionally as means of preservation and/or anticorrosive additive comprises a mixture ofa) a conversion product of boric acid and a primary or tertiary alkanolamine and/orb) an ethoxylated and/or propoxylated fatty acid or a fatty acid alkanolamide as well as at least one further compound selected from the group comprised ofc) a carboxylic acid imide, a phosphoric acid ester, a triazole, a thiadiazole, an isothiazolinone, an imidazole, a guanidine, an aromatic carboxylic acid and the 3-iodo-2-propinyl-carbamate and/ord) a methylol urea derivative.