COOLANT BASED ON AZOLE DERIVATIVES CONTAINING 1,3-PROPANEDIOL FOR FUEL CELL COOLING SYSTEMS

摘要

The invention relates to an anti-freeze concentrate for the cooling systems of fuel cell drives, from which ready-to-use aqueous coolant compositions with a maximum conductivity of 50 S/cm can be produced, based on 1,3-propanediol or mixtures of 1,3-propanediol with alkylene glycols and/or derivatives thereof , comprising one or more five-membered heterocyclic compounds (azole derivatives) with two or three heteroatoms from the group nitrogen or sulphu r which comprise no or a maximum of one sulphur atoms and which can have an aromatic or saturated six-membered annelated ring.