Lubricating grease composition based on ionic liquids
AssigneeKlüber Lubrication München KG
InventorsMartin Schmidt-Amelunxen, Dieter Sohn, Stefan Grundei, Andrea Höpke
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Abstract
The invention relates to the use of ionic liquids for production of water-resistant lubricating grease compositions, which are used in a temperature range from at least 30° C. to at least 180° C. and have good anticorrosion properties.
Claims23
A method for protective treatment of a component exposed to contact with water to prevent corrosion and oxidation at temperatures of at least −30° C. to at least 180° C. comprising applying a water-resistant lubrication grease composition to the surface of the component to be treated, the water-resistant lubrication grease composition comprising:
- (a) 40 to 95 wt. % of one or more ionic liquid(s) having a cation selected from the group consisting of a quaternary ammonium cation or a phosphonium cation and having an anion selected from the group consisting of a bis(perfluoroalkylsulfonyl)imide, bis(trifluoromethylsulfonyl)imide, bis(perfluoroaryl)imide, and tris(perfluoroalkyl)trifluorophosphate, wherein the cation of the ionic liquid has a long hydrophobic alkyl chain, aryl group or alkylaryl group with at least 8 to 25 carbon atoms and all the hydrophobizing alkyl, aryl or alkyaryl groups of the cation have at least 15 to 60 carbon atoms and a melting point of <−30° C.;
- (b) 0.1 to 10 wt. % of a conventional soluble additive for lubricants;
- (c) 5 to 60 wt. % of a water-resistant thickener.
A water-resistant lubricating grease composition comprising:
- (a) 40 to 95 wt. % of one or more ionic liquid(s) having a cation selected from the group consisting of a quaternary ammonium cation or a phosphonium cation and having an anion selected from the group consisting of a bis(perfluoroalkylsulfonyl)imide, bis(trifluoromethylsulfonyl)imide, bis(perfluoroaryl)imide, and tris(perfluoroalkyl)trifluorophosphate, wherein the cation of the ionic liquid has a long hydrophobic alkyl chain, aryl group or alkylaryl group with at least 8 to 25 carbon atoms and all the hydrophobizing alkyl, aryl or alkyaryl groups of the cation have at least 15 to 60 carbon atoms and a melting point of <−30° C.;
- (b) 0.1 to 10 wt. % of a conventional soluble additive;
- and
- (c) 5 to 60 wt. % of a water-resistant thickener.
Dependencies are inferred from the claim text.