| abstract |
The invention relates to protective lubricants for corrosion protection of the interior of combustion engines, which contain a) from 70 to 95% by weight of a base oil and/or engine oil, b) from 0.1 to 6.0% by weight of an additive of a neutralising detergent, c) from 0.05 to 2.0% by weight of a barium, calcium or zinc salt of dialkyldithiophosphoric acid having 6 to 30 carbon atoms, or a mixture thereof, d) from 1 to 12% by weight of a corrosion-inhibiting, neutralising inhibitor comprising a polyethylene glycol sulphonamide, polyethylene glycol N-(alkyl)sulphonamide, polyethylene glycol sulphonimide or polyethylene glycol N-(alkyl)sulphonimide having an average molecular weight of from 300 to 900, or a mixture thereof, and e) from 0.1 to 1.0% by weight of a corrosion and simultaneously emulsification inhibitor comprising a mono-, di- or triester of fatty acids having 8 to 22 carbon atoms which contain a double bond with di- and/or triethanolamine and/or a salt of a monoester and/or diester of this type, or a mixture thereof, and optionally f) from 0.1 to 6.0% by weight of an additive which increases the viscosity index and adhesion, comprising a polyolefin or an olefin copolymer having an average molecular weight of from 500 to 50000 or a polyacrylic ester (polyacrylate) or polymethacrylic ester (polymethacrylate) having an average molecular weight of from 5000 to 900000, or a mixture thereof. The effect of these protective lubricants is much better than that of the known ones. |