Lubricating grease composition
AssigneeKlüber Lubrication München KG
InventorsGünther Bodesheim, Martin Schmidt-Amelunxen, Dieter Sohn, Stefan Grundei, Andrea Höpke
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Abstract
The invention relates to lubricating grease compositions having a base oil mixture based on oils having viscosities (ISO VG 2 to ISO VG 1500) that are standard for industrial lubricants, an ionic liquid, a thickening agent, e.g., based on a polyurea compound and conventional additives that can be used at current service temperatures that are higher than 120° C. to 260° C., in particular at a service temperature in the region of high service temperatures that are higher than 180° C. to 260° C. and also at low temperatures as low as −60° C. The invention also relates to a method for producing said type of lubricating grease compositions.
Claims11
A lubricating grease composition consisting of a mixture of
- (a) 5 to 95 wt % base oil based on oils with a standard viscosity for industrial lubricants, consisting of an ester of an aromatic or aliphatic di-, tri- or tetracarboxylic acid with one or a mixture of C7 to C22 alcohols consisting of a polyphenyl ether or alkylated diphenyl ether, an ester of trimethylolpropane, pentaerythritol or dipentaerythritol with aliphatic C7 to C22 carboxylic acids, C18 dimer acid esters with C7 to C22 alcohols, complex esters as individual components or in any mixture, or selected from poly-α-olefins, alkylated naphthalenes, alkylated benzenes, polyglycols, silicone oils, perfluoro polyethers,
- (b) 1 to 10 wt % ionic liquid or a mixture of ionic liquids selected from the group consisting of
- butylmethylpyrrolidinium bis(trifluoromethylsulfonyl)imide,
- trihexyl(tetradecyl)phosphonium
- bis(trifluoromethylsulfonyl)imide,
- 1-ethyl-3-methylimidazolium ethyl sulfate,
- 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and
- N-ethyl-3-methylpyridinium nonafluorobutanesulfonate,
- (c) 3 to 50 wt % thickening agent selected from the group consisting of
- a reaction product of a diisocyanate selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, and 4,4′-diisocyanatodiphenylmethane, which may be used individually or in combination, with an amine of the general formula R′2N—R, where R is an aryl, alkyl or alkylene radical with 2 to 22 carbon atoms and R′ is identical or different hydrogen, an alkyl, alkylene or aryl radical, metal soaps and metal complex soaps,
- and
- (d) 0.1 to 10 wt % conventional additives individually or in combination, selected from the group consisting of corrosion preventives, oxidation preventives, wear preventives, friction reducing agents, agents to protect against metal effects, UV stabilizers, organic or inorganic solid lubricants selected from polyimide, polytetrafluoroethylene (PTFE), graphite, metal oxides, boron nitride, molybdenum sulfide and phosphate.
Dependencies are inferred from the claim text.