EP4310163B1 - Composition de graisse lubrifiante contenant un liquide ionique - Google Patents

Composition de graisse lubrifiante contenant un liquide ionique Download PDF

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Publication number
EP4310163B1
EP4310163B1 EP22186355.8A EP22186355A EP4310163B1 EP 4310163 B1 EP4310163 B1 EP 4310163B1 EP 22186355 A EP22186355 A EP 22186355A EP 4310163 B1 EP4310163 B1 EP 4310163B1
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EP
European Patent Office
Prior art keywords
weight
grease composition
lubricant grease
base oil
composition according
Prior art date
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EP22186355.8A
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German (de)
English (en)
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EP4310163A1 (fr
Inventor
Stefan Grundei
Daniel CHALL
Martin Schmidt-Amelunxen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Klueber Lubrication Muenchen & Co Kg GmbH
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Klueber Lubrication Muenchen & Co Kg GmbH
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Application filed by Klueber Lubrication Muenchen & Co Kg GmbH filed Critical Klueber Lubrication Muenchen & Co Kg GmbH
Priority to PL22186355.8T priority Critical patent/PL4310163T3/pl
Priority to EP22186355.8A priority patent/EP4310163B1/fr
Priority to JP2025503019A priority patent/JP2025523226A/ja
Priority to US18/997,186 priority patent/US12612575B2/en
Priority to CN202380055136.XA priority patent/CN119907848A/zh
Priority to PCT/EP2023/062567 priority patent/WO2024017518A1/fr
Publication of EP4310163A1 publication Critical patent/EP4310163A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/36—Esters of polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
    • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/06—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having more than one carboxyl group bound to an acyclic carbon atom or cycloaliphatic carbon atom
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/12—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to a carbon atom of a six-membered aromatic ring
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
    • C10M137/14—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
    • C10M2207/1276—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic used as thickening agent
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/2805—Esters used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/285—Esters of aromatic polycarboxylic acids
    • C10M2207/2855—Esters of aromatic polycarboxylic acids used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
    • C10M2209/1075—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
    • C10M2223/065—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/077—Ionic Liquids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy

Definitions

  • the present invention relates to a lubricating grease composition containing an ionic liquid and its use.
  • ionic liquids can be used as additives in lubricants such as lubricating greases and lubricating oils. This can have a positive effect on tribologically relevant properties such as friction, wear and electrical conductivity. Good results are achieved in particular with ionic liquids that contain CFx groups. These groups are usually contained in the anions and, as additives in lubricants, improve their thermal resilience and electrical conductivity. Due to its very good thermal and hydrolytic resistance, bis(trifluoromethylsulfonyl)imide (bta) is an important representative of these anions.
  • a disadvantage of compounds containing CFx is that these groups are not biodegradable and ionic liquids containing such groups are, as a result, persistent.
  • ionic liquid is trihexyl(tetradecyl)phosphoniumbis(fluorosulfonyl)imide.
  • ionic liquids based on bis(fluorosulfonyl)imide (fsi) as anion have a significantly lower thermal stability than ionic liquids that contain CFx groups. This can be explained primarily by the fact that the fsi anion lacks strong carbon-fluorine bonds, which has a negative effect on the stability of the molecule as a whole.
  • the non-polar base oils can have a polar component. However, this is always less than 50% by weight, based on the total weight of the base oil.
  • the EP2164935B1 describes the use of selected ionic liquids with fluorine-containing anions in lubricating grease compositions to reduce aging phenomena of the lubricant and to reduce electrical resistance.
  • the object of the present invention is to provide a lubricant composition which can dispense with the use of ionic liquids containing BTA and which nevertheless has good tribologically relevant properties with regard to friction, wear and electrical conductivity.
  • the lubricant composition should have sufficient temperature stability, preferably at least 180°C, and be able to contain a high proportion of polar base oils.
  • the lubricating grease composition according to the invention it is possible to dispense with the use of ionic liquids containing BTA and still obtain good tribologically relevant properties with regard to friction, wear and electrical conductivity.
  • the lubricating grease composition can contain a high proportion of polar base oils and it also has sufficient temperature stability, preferably at least 180°C.
  • the high temperature stability of the lubricating grease composition according to the invention was surprising, since ionic liquids based on bis(fluorosulfonyl)imide as anion are known to have only low thermal stability.
  • the lubricating grease composition preferably comprises a base oil which has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide of at least 3% by weight at a room temperature of 20°C.
  • This solubility shows the high polarity of the base oil.
  • the base oil A preferably also has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide of at least 3% by weight at a room temperature of 20°C.
  • the solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide is preferably carried out as described in the test methods chapter.
  • the base oil can contain one or more base oils A and optionally also base oils other than base oil A. According to the invention, however, the lubricating grease composition preferably contains no further base oils in addition to the base oil.
  • the base oil has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide of at least 3 wt.%, preferably at least 5 wt.%, even more preferably at least 10 wt.% at a room temperature of 20°C.
  • the base oil at a room temperature of 20°C has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide at least in the range from 3% by weight to 30% by weight and/or at least in the range from 5% by weight to 30% by weight, and/or at least in the range from 10% by weight to 30% by weight and/or at least in the range from 3% by weight to 20% by weight, and/or at least in the range from 5% by weight to 20% by weight, and/or at least in the range from 10% by weight to 20% by weight, and/or at least in the range from 3% by weight to 15% by weight and/or at least in the range from 5% by weight to 15% by weight and/or at least in the range from 10% by weight to 15% by weight.
  • the base oil A has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide of at least 3% by weight, preferably at least 5% by weight, even more preferably at least 10% by weight, at a room temperature of 20°C.
  • the base oil A has a solubility for the ionic Liquid methyltrioctylammonium bis(fluorosulfonyl)imide at least in the range of 3 wt.% to 99 and/or at least in the range of 5 wt.% to 99 wt.%, and/or at least in the range of 10 wt.% to 99 wt.%, and/or at least in the range of 3 wt.% to 80 wt.%, and/or at least in the range of 5 wt.% to 80 wt.%, and/or at least in the range of 10 wt.% to 80 wt.%, and/or at least in the range of 3 wt.% to 15 wt.% and/or at least in the range of 5 wt.% to 15 wt.% and/or at least in the range of 10 wt.% to 15 wt.%.
  • the base oil A is present in a proportion of 50 to 100% by weight and/or in a proportion of more than 55% by weight, for example from 55 to 100% by weight, and/or in a proportion of more than 60% by weight, for example from 60 to 100% by weight, even more preferably in a proportion of more than 70% by weight, for example from 70 to 100% by weight, in each case based on the total weight of the base oil.
  • the proportion of base oil, based on the total weight of the lubricating grease composition is 20 wt.% to 96.5 wt.%, preferably 40 wt.% to 95%, more preferably 60 wt.% to 90%, even more preferably 70 wt.% to 95% and in particular 75 wt.% to 85 wt.%.
  • the proportion of base oil A based on the total weight of the lubricating grease composition is preferably 10 wt.% to 96.5 wt.%, more preferably 35 wt.% to 95 wt.%, even more preferably 40 wt.% to 90 wt.%, in particular 35 wt.% to 85 wt.%.
  • the base oil A is an ester and/or a polyglycol, wherein the polyglycol is preferably a polyglycol containing unsubstituted ethylene units as carbon group in the repeat unit.
  • a particularly preferred polyglycol is a Polyalkylene glycol containing unsubstituted ethylene units as carbon group in the repeat unit, preferably a polyalkylene glycol containing unsubstituted ethylene units and methyl-substituted ethylene units as carbon group in the repeat unit.
  • a likewise preferred polyglycol is a polyalkylene glycol containing unsubstituted ethylene units as carbon group in the repeat unit, wherein the weight proportion of the unsubstituted ethylene units is preferably at least 20 wt.%, for example 20 wt.% to 100 wt.%, preferably at least 30 wt.%, for example 30 wt.% to 100 wt.%, based on the total weight of the polyglycol.
  • the ester has an oxygen/carbon weight ratio of more than 0.1, for example from 0.1 to 0.35, preferably from more than 0.15 to 0.30 and/or the polyglycol has an oxygen/carbon weight ratio of more than 0.44, for example from 0.44 to 0.70, preferably of more than 0.50, for example from 0.50 to 0.68.
  • a particularly preferred polyglycol is selected from homopolymers of ethylene oxide as the sole monomer and/or copolymers with unsubstituted ethyl groups and 1-methylethyl groups as carbon groups in the repeat unit, the weight proportion of the unsubstituted ethylene units in the copolymers preferably being at least 20% by weight, for example 20% by weight to 90% by weight, preferably at least 30% by weight, for example 30% by weight to 90% by weight, based on the total weight of the polyglycol.
  • the end groups of the particularly preferred polyglycol are, independently of one another, preferably hydroxide groups and/or C1-C20 alkoxide groups, preferably C1-C6 alkoxide groups.
  • the alkoxide end groups can additionally be substituted.
  • the end groups can be introduced during the production of the polyglycol. by reacting the monomeric ethylene oxides with a monofunctional starter.
  • Monofunctional starters are preferably water and alcohols, especially butanol.
  • Two or more chains of the polyglycol can also be linked via an end group.
  • Alkyl groups are preferred as the linking end group. This can be done when producing the polyglycol from ethylene oxides with a nucleophilic di- or higher-functional starter. Examples of difunctional starters are diols, especially 1,2-ethanediol.
  • esters are carboxylic acid esters, preferably monoesters, diesters, triesters, tetraesters, pentaesters, polyesters, preferably estolides. Diesters, triesters, tetraesters, pentaesters, polyesters, estolides and mixtures thereof are particularly preferred.
  • carboxylic acid esters are aromatic esters, preferably of aromatic C8-C20, preferably C8-C10, di-, tri- or tetracarboxylic acids with one or in a mixture of aliphatic C7 to C22 alcohols and aliphatic esters, preferably of aliphatic C4-C22 monocarboxylic acids and/or dicarboxylic acids with an aliphatic mono-, di-, tri-, tetra, penta, hexa-alcohol present individually or in a mixture with a carbon number of 3 to 22, preferably polyol esters, such as preferably complex esters, estolides and mixtures thereof.
  • the acid and/or alcohol component and/or hydroxycarboxylic acid component of the carboxylic acid esters independently of one another preferably have a number of carbon atoms from C3 to C54.
  • Preferred acid components have a number of carbon atoms from C4 to C22
  • preferred alcohol components have a number of carbon atoms from C3 to C22
  • /or preferred hydroxycarboxylic acid components have a number of carbon atoms from C14 to C22.
  • Preferred diesters are diesters whose acid component has fewer than 36 carbon atoms, preferably 6 carbon atoms to 20 carbon atoms, even more preferably 6 Carbon atoms up to 12 carbon atoms.
  • the advantage of these esters is their good dissolving power for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide.
  • Estolides are oligomeric aliphatic hydroxycarboxylic acids, preferably 12-hydroxystearic acid or oligomers of unsaturated carboxylic acids, preferably oleic acid, in which the terminal carboxylic acid group is esterified with a mono-alcohol, dialcohol, trialcohol and/or tetra-alcohol, preferably branched monoalcohols, very particularly preferably Guerbet alcohols, and in which any free hydroxide groups present can be esterified by reaction with monocarboxylic acids or dicarboxylic acids.
  • the ester is selected from the group consisting of aliphatic esters of aliphatic monocarboxylic acids having a carbon number of C 5 to C 22 with an aliphatic tri, tetra, hexa-alcohol present individually or in mixtures with a carbon number of C 3 to C10, in particular trimethylolpropane, pentaerythritol and/or dipentaerythritol, and/or aliphatic esters of aliphatic dicarboxylic acids, having a carbon number of C 6 to C 20, with an aliphatic mono- and/or dialcohol present individually or in mixtures with a carbon number of 6 to 22, estolides and aromatic esters of aromatic tri- and tetracarboxylic acids with one or in mixtures of aliphatic C7 to C22 alcohols and mixtures thereof.
  • Base oils which are also suitable according to the invention contain the base oil A in a mixture with a base oil B.
  • the base oil B preferably has a solubility for the ionic liquid methyltrioctylammonium bis(fluorosulfonyl)imide of less than 3% by weight, for example from 01% by weight to 3% by weight, preferably less than 2.5% by weight, for example from 0.01% by weight to 2.5% by weight, even more preferably less than 2% by weight, for example from 0.01% by weight to 2% by weight, even more preferably less than 1% by weight, for example from 0.01% by weight to 1% by weight.
  • the base oil B is a base oil B1 which has an oxygen/carbon weight ratio of at most 0.1, for example from 0 to 0.1 and/or a base oil B2 which has a proportion of halogens and/or silicon of more than 5% by weight, for example from 5% by weight to 30% by weight, preferably from 10% by weight to 25% by weight, based on the total weight of the base oil B2.
  • the proportion of the base oil A is more than 50% by weight, for example from 50 to 90% by weight, more preferably more than 60% by weight, for example from 60 to 85% by weight, in particular more than 70% by weight, for example from 70 to 85% by weight, based on the total weight of the base oil.
  • Preferred base oils B are selected from the group consisting of base oils of groups I, II, II+, III, IV and from the following base oils of group V according to the classification of the American Petroleum Institute (API) [NLGI Spokesman, N. Samman, Volume 70, Number 11, p.14ff], namely diphenyl ethers, alkylated naphthalenes, polyisobutylenes, silicone oils, polytetrahydrofurans and oxetane polymers, polyalkylene glycols substituted with aliphatic and/or aromatic alkyl groups.
  • API American Petroleum Institute
  • ethylene units the weight proportion of unsubstituted ethylene units in the polyalkylene glycols being less than 20% by weight based on the total weight of the polyalkylene glycol, and aliphatic esters of aliphatic dicarboxylic acids having a carbon number of C22 to C40, preferably C34 to C38, with an aliphatic mono- and/or dialcohol present individually or in mixtures having a carbon number of 6 to 22, aliphatic esters of aliphatic tricarboxylic acids having a carbon number of C33 to C60, preferably C50 to C58, with an aliphatic mono- and/or dialcohol present individually or in mixtures having a carbon number of 6 to 22, and mixtures thereof.
  • Particularly preferred base oils are alkylated diphenyl ethers, polyisobutylenes, polyalphaolefins and mixtures thereof.
  • the base oils can also be composed of mixtures of the preceding base oils.
  • the proportion of base oil B is preferably less than 50% by weight, for example 10 to 49% by weight, more preferably at most 40% by weight, for example 10% to 40% by weight, in particular at most 30% by weight, for example 10 to 30% by weight, based on the total weight of the base oil.
  • the proportion of base oil B is preferably at most 48% by weight, for example 5 to 48% by weight, more preferably at most 40% by weight, for example 10% to 40% by weight, in particular at most 30% by weight, for example 10 to 30% by weight, based on the total weight of the lubricating grease composition.
  • the lubricating grease composition according to the invention preferably has a kinematic viscosity at 40 °C of 20 mm 2 /sec to 1500 mm 2 /sec, preferably from 20 mm 2 /sec to 320 mm 2 /sec, more preferably from 25 mm 2 /sec to 220 mm 2 /sec, more preferably from 30 mm 2 /sec to 150 mm 2 /sec.
  • the kinematic viscosity is determined according to ASTM D 7042, edition 2021.01.
  • the proportion of the ionic liquid whose anion is bis(fluorosulfonyl)imide is according to the invention from 0.5 wt.% to 80 wt.%, more preferably from 2 wt.% to 40 wt.%, more preferably from 2 wt.% to 20 wt.%, more preferably from 3 wt.% to 15 wt.% and in particular from 5 wt.% to 10 wt.%, based on the total weight of the lubricating grease composition.
  • the base oil contains the base oil A and the base oil B in a weight ratio between base oil A and base oil B of at least 50:50, for example from 50:50 to 60:40, more preferably of at least 60:40, for example from 60:40 to 70:30, even more preferably of at least 70:30, for example from 70:30 to 90:10, in particular of at least 80:20, for example from 80:20 to 90:10.
  • the base oil contains the base oil A and the base oil B in a weight ratio between base oil A and base oil B of 50:50 to 60:40 and the proportion of ionic liquid whose anion is bis(fluorosulfonyl)imide (fsi) is from 0.5 to 10 wt.%, preferably from 3 to 10 wt.%, based on the total weight of the lubricating grease composition, and/or in a weight ratio between base oil A and base oil B of 60:40 to 70:30 and the proportion of ionic liquid whose anion is bis(fluorosulfonyl)imide (fsi) is from 0.5 wt.% to 15 wt.%, preferably from 3 wt.% to 15 wt.%, based on the total weight of the lubricating grease composition and/or in a weight ratio between base oil A and base oil B of 70:30 to 90:10 and the proportion of ionic liquid whose Anion is bis(flufluorosulfon
  • the ionic liquid has a cation selected from the group consisting of symmetrical and asymmetrical ammonium ions, NR 1 R 2 R 3 R 4 + and phosphonium ions PR 1 R 2 R 3 R 4 +.
  • the radicals R 1 to R 4 can independently of one another be branched or unbranched, substituted or unsubstituted C 1 - to C 24 -, preferably C 1 - to C 18 -, particularly preferably C 6 - to C 18 -alkyl groups or C 6 - to C 30 - aryl groups.
  • Preferred substituents are alkoxy, carboxy, amido, amino, thiocarboxy, carbamoyl, oxo, thioxo and/or hydroxy.
  • the radicals R 1 to R 4 are selected so that they have a total of at least 10 carbon atoms, preferably at least 20 carbon atoms, more preferably at least 25 carbon atoms.
  • the ionic liquid has one or more cations selected from the group consisting of: trihexyltetradecylphosphonium, tributyltetradecylphosphonium, tetraoctylphosphonium, trioctylmethylammonium, tributylmethylphosphonium, tributylphosphonium and mixtures thereof.
  • Trihexyltetradecylphosphonium, tributyltetradecylphosphonium, tetraoctylphosphonium and trioctylmethylammonium and mixtures thereof are very particularly preferred.
  • the lubricating grease composition according to the invention can also contain mixtures of different ionic liquids in which the anions are each bis(fluorosulfonyl)imide but the cations are different.
  • the lubricating grease composition according to the invention can also contain further ionic liquids whose anion is not bis(fluorosulfonyl)imide.
  • the proportion of the further ionic liquid is preferably 0.5% by weight to 5% by weight, based on the total weight of the lubricating grease composition.
  • the lubricating grease composition does not contain any ionic liquids whose anion is not bis(fluorosulfonyl)imide. This is advantageous because the use of multiple ionic liquids increases the complexity of the manufacturing process and, associated with this, the manufacturing costs. More preferably, the lubricating grease composition does not contain any ionic liquid that contains bis(trifluoromethylsulfonyl)imide (bta) as an anion. This is advantageous for toxicological reasons.
  • the lubricating grease composition does not contain any ionic liquids whose anion is not bis(fluorosulfonyl)imide, or these are present in a proportion of at most 0.5% by weight, based on the total weight of the lubricating grease composition. More preferably, the lubricating grease composition does not contain any ionic liquid that contains perfluoroalkyl groups, or ionic liquids that contain perfluoroalkyl groups in a proportion of at most 0.5% by weight, based on the total weight of the lubricating grease composition. This is advantageous for toxicological reasons.
  • ionic liquid in a lubricant composition which is designed as a lubricating grease composition is particularly advantageous since the positive effects on the service life, attributable to the ionic liquid fsi, are particularly evident in lubricating greases, since lubricating greases are usually present in smaller quantities than lubricating oils at the lubrication point.
  • the lubricating grease composition preferably contains the thickener in a proportion of 4 to 30 wt.%, in particular 6 to 20 wt.%, in each case based on the total weight of the lubricating grease composition.
  • the worked penetration (in 1/10 mm) of the lubricating grease composition formed as a lubricating grease is between 400 and 200, more preferably between 330 and 220, even more preferably between 300 and 250.
  • the worked penetration is determined according to DIN ISO 2137, edition 2016.12.
  • the thickener is selected from urea, lithium simple soaps, metal complex soaps of the elements of the 1st and 2nd main groups of the periodic table, in particular lithium complex soaps and mixtures thereof.
  • Urea is understood to mean reaction products of organic mono-, di-, tri- and higher-functional isocyanates and/or mixtures thereof with aliphatic and/or aromatic mono-, di-, tri- or higher-functional organic amines.
  • the urea is a diurea containing aliphatic, cycloaliphatic/aliphatic and/or cycloaliphatic ureas.
  • the urea is a diurea represented by formula A wherein R 2 is a divalent aromatic C6-15 hydrocarbon radical; and R 1 and R 3 are independently a C6-20 cycloalkyl radical, in particular cyclohexyl radical or a straight-chain or branched C8-20 alkyl radical.
  • Diurea compounds which can preferably be used according to the invention are described in DE112012001102A1 .
  • the thickener is selected from lithium simple soaps, metal complex soaps of the elements of the 1st and 2nd main groups of the periodic table, in particular lithium complex soaps and mixtures thereof.
  • the lithium complex soap is a lithium complex soap prepared from C4-C36 dicarboxylic acids, preferably azelaic acid, sebacic acid, suberic acid, terephthalic acid, dodecanedioic acid and/or from higher functional carboxylic acids with 3 or more, preferably 3 to 4 carboxylic acid groups, where the number of carbon groups can be 6 to 60, such as preferably citric acid and trimer acids, and/or starting from ester compounds, in particular methyl esters and/or triglycerides of one or more of the aforementioned acids, each combined with one or more monocarboxylic acids, preferably combined with one or more C4-C24 monocarboxylic acids, preferably stearic acid, hydroxystearic acid, in particular 12-hydroxystearic acid, palmitic acid, oleic acid, salicylic acid, ester compounds, in particular methyl esters and/or triglycerides of one or more of the aforementioned acids and/or combined with se
  • the lubricating grease composition contains 20 to 92.5 wt.%, based on the total weight of the lubricating grease composition, of the base oil and 4 to 20 wt.%, based on the total weight of the lubricating grease composition, of a further thickener, preferably selected from aluminum complex soaps, bentonite, sulfonate, silicate, polyimide and mixtures thereof.
  • the lubricating grease composition can also contain inorganic and/or organic solid lubricants.
  • Preferred solid lubricants are selected from the group consisting of polytetrafluoroethylene (PTFE), molybdenum disulfide, graphite, graphene, boron nitride (hexagonal), tin(IV) sulfide, zinc(II) sulfide, tungsten disulfide, metal sulfide, phosphate, preferably calcium phosphate, carbonate, preferably calcium carbonate, metal oxide, preferably amorphous silicon dioxide, silicate and layered silicate, talc, mica and mixtures thereof.
  • PTFE polytetrafluoroethylene
  • molybdenum disulfide graphite, graphene, boron nitride (hexagonal)
  • tin(IV) sulfide zinc(II) sulfide
  • tungsten disulfide metal
  • Particularly preferred solid lubricants are selected from the group consisting of molybdenum disulfide, graphite, graphene, boron nitride (hexagonal), tin(IV) sulfide, zinc(II) sulfide, tungsten disulfide, metal sulfide, phosphate, preferably calcium phosphate, carbonate, preferably calcium carbonate, metal oxide, preferably amorphous silicon dioxide, silicate and layered silicate, talc, mica and mixtures thereof.
  • the proportion of solid lubricant in the lubricating grease composition according to the invention is preferably 0.5 wt.% to 23 wt.%, more preferably 0.5 wt.% to 20 wt.% and in particular 0.5 wt.% to 18 wt.%, in each case based on the total weight of the lubricating grease composition.
  • the lubricating grease composition can contain additives, for example against corrosion, oxidation (antioxidants) and for protection against metal influences, for example chelating compounds, radical scavengers, UV stabilizers, reaction layer formers, viscosity improvers, pour point depressants, adhesion improvers and/or additives to reduce oil separation in greases.
  • additives for example against corrosion, oxidation (antioxidants) and for protection against metal influences, for example chelating compounds, radical scavengers, UV stabilizers, reaction layer formers, viscosity improvers, pour point depressants, adhesion improvers and/or additives to reduce oil separation in greases.
  • the proportion of additives in the lubricating grease composition according to the invention is preferably 0.5% by weight to 23% by weight, more preferably 0.5% by weight to 20% by weight, even more preferably 1% by weight to 18% by weight and in particular 1.5% by weight to 12% by weight, based on the total weight of the lubricating grease composition.
  • Additives in the form of phosphorus-, sulfur-, nitrogen- and/or oxygen-containing compounds, polymers and/or mixtures thereof are preferably used.
  • Particularly preferred additives are aromatic amines, phenols, in particular alkylated phenols, triazoles such as benzotriazoles, tolyltriazoles, esters, in particular sulfurized fatty acid esters, glycerol mono- or di-esters, sorbitan esters, Thiadiazoles, dithiocarbamates, in particular molybdenum dithiocarbamates, phosphates, in particular thiophosphates, oligomeric phosphates, oligomeric thiophosphates, dithiophosphates, zinc dialkyldithiophosphates, molybdenum dithiophosphates, amine phosphates, trialkyl phosphates, triaryl phosphates, phosphites, metal salts, carboxylic acids, polymers, in particular polymethacrylates, olefin copolymers and/or mixtures thereof.
  • triazoles such as benzotriazoles, tolyltriazoles, est
  • Very preferred additives are aromatic amines, alkylated phenols, thiadiazoles, dithiocarbamates, triaryl phosphates, amine phosphates, benzotriazoles and/or mixtures thereof.
  • Particularly preferred additives are aromatic amines, since it has surprisingly been found that their use can achieve a particularly strong delay in the onset of oxidation by the ionic liquid.
  • Aromatic amines preferred according to the invention are styrenated diphenylamine, phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, octylated and/or butylated diphenylamine, in particular p,p'-dioctyldiphenylamine, nonylated diphenylamine.
  • the lubricating grease composition contains diphenylamine, in particular p,p'-dioctyldiphenylamine, as antioxidants.
  • the lubricating grease composition comprises the additives in a proportion of 0.5 wt.% to 23 wt.%, more preferably from 0.5 wt.% to 20 wt.%, in particular from 0.5 wt.% to 10 wt.%, based on the total weight of the lubricating grease composition.
  • the lubricating grease composition is characterized by a lower service temperature of not greater than -30°C, for example from -60°C to -30°C, preferably not greater than -40°C, for example from -60°C to -40°C, determined according to IP 186, Edition 2015 and/or preferably an upper service temperature of at least +160°C, for example from 160°C to 220°C, preferably at least +180°C, for example from 180°C to 220°C, determined according to DIN 51821 1+2, Edition 2016,7.
  • a lower service temperature of not greater than -30°C, for example from -60°C to -30°C, preferably not greater than -40°C, for example from -60°C to -40°C, determined according to IP 186, Edition 2015 and/or preferably an upper service temperature of at least +160°C, for example from 160°C to 220°C, preferably at least +180°C, for example from 180°C to 220°C, determined according to DIN 51821 1+
  • a further object of the present invention comprises the use of the lubricating grease composition according to the invention for the lubrication of drive elements, preferably rolling bearings, gears, plain bearings, actuators and/or chains.
  • Further preferred drive elements are rolling bearings, gears, plain bearings, actuators and/or chains which are arranged in systems and machines for the production and conveyance of food, in wind turbines, in vehicles, preferably automobiles, in particular in hybrid and electric vehicles, in rail vehicles, industrial plants, industrial robots and/or in ships.
  • the drive elements are selected from pulley bearings, fan bearings, vacuum pump bearings, rolling bearings of electric motors, in particular of hybrid and electric vehicles, generators, in particular of electric vehicles and rail vehicles, Wind turbines, industrial engines, auxiliary units in vehicles and/or vehicle joints.
  • the lubricating grease composition is particularly preferably used for lubricating rolling bearings of electric motors of hybrid and/or electric vehicles.
  • the lubricating grease composition according to the invention has a combination of properties that is particularly suitable for these applications.
  • the very good temperature stability combined with the ability to dissipate electrical potentials is particularly advantageous.
  • a further subject matter of the present invention comprises the use of the lubricating grease composition for the lubrication of drive elements, preferably of rolling bearings, in which a lower service temperature of not greater than -30°C, for example from -60°C to -30°C, preferably not greater than -40°C, for example from -60°C to -30°C, determined according to IP 186, Edition 2015 and/or preferably an upper service temperature of at least +160°C, for example from 160°C to 220°C, more preferably at least +180°C, for example from 180°C to 220°C, determined according to DIN 51821 1+2 Edition 2016.7 is necessary.
  • the TGA measurements show a better temperature stability for P666(14) bta compared to P666(14) fsi. Both in the measurement with air and with N 2 , the values for evaporation losses are lower for P666(14) bta.
  • the better temperature stability for bta can be explained by the strong carbon-fluorine bond in the anion.
  • Figure 2 shows that P666(14) fsi exhibits a significant exothermic reaction at around 270°C, but P666(14) bta does not. Both investigations confirm the lower thermal stability of the ionic liquid with the fsi anion in pure substance.
  • trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide (P666(14) fsi) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide (P666(14) bta) are filled into cylindrical screw-top vials (base area 1.5 cm 2 , height 5 cm). 200 mg of each of the two ILs are weighed precisely.
  • One vial without a ball and one vial with a ball (100Cr6 steel balls according to DIN 51350-1, edition 2015-03) are used for two test temperatures.
  • the evaporation losses for both substances are naturally higher than at 150°C.
  • the value curve for the P666(14) fsi is unremarkable in contrast to the lower test temperature. Nevertheless, at the end of the period they are higher than for the P666(14) bta.
  • the observed values can be understood to mean that in addition to decomposition with loss of mass, phenomena such as absorption/release of water, corrosion of the steel ball and catalyzed decomposition also play a role.
  • the tests of the substances in their pure form suggest that the stability of the IL containing fsi is lower than the stability of the IL containing bta.
  • the base grease A consists of 85% by weight of a trimellitic acid ester with C9 - C11 alcohols with an oxygen/carbon ratio of 0.20 with a base oil viscosity at 40°C of approx. 72 mm 2 /sec (TMSE-A), 11% by weight of a urea thickener consisting of the reaction products of aliphatic saturated amines, aliphatic unsaturated amines and aromatic amines with a mixture of MDI (4,4'-diisocyanatodiphenylmethane) and TDI (mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene in a molar ratio of approx. 4:1). 0.5% by weight of p,p'-dioctyldiphenylamine and 3.5% by weight of other additives (corrosion protection, anti-wear) are used as additives.
  • TMSE-A trimellitic acid ester with C9
  • the grease 1 according to the invention surprisingly shows a service life improved by about 50% at 180°C compared to the comparison grease 2, which contains an ionic liquid not according to the invention.
  • the grease according to the invention also meets the service life requirement of DIN 51821 1+2 at 200°C.
  • the grease 1 according to the invention shows a significant increase in the service life achieved, based on the L 50 value, by more than a factor of 2.5.
  • the grease 3 according to the invention also shows an increase in service life by 50% compared to the base grease A.
  • the base fat B consists of:
  • trimellitic acid ester with linear C8 and C10 alkyl groups which are present in a ratio of approximately 1:1 (molar) (TMSE-B) with an oxygen/carbon ratio of 0.22, 13.5 wt.% urea thickener, produced by the reaction of MDI (4,4'-diisocyanatodiphenylmethane) and octylamine in a ratio of 1.2 (molar), 1 wt.% p,p'-dioctyldiphenylamine, 1 wt.% calcium sulfonate corrosion inhibitor additive.
  • MDI 4,4'-diisocyanatodiphenylmethane
  • octylamine in a ratio of 1.2 (molar)
  • 1 wt.% p,p'-dioctyldiphenylamine 1 wt.% calcium sulfonate corrosion inhibitor additive.
  • the grease 6 according to the invention shows an increase in service life of approximately 50% while maintaining the very steep failure curve (high ⁇ values).
  • the grease 7 according to the invention shows an increase in service life of approximately 40%.
  • Polyglycol A is a polyglycol with a kinematic viscosity of 220 mm 2 /sec. It is a random copolymer of Ethylene oxide and propylene oxide in a ratio of 1:1 (molar) with glycol as starter. The oxygen/carbon ratio is 0.53.
  • Trimellitic acid ester B (trimellitic acid ester with linear C8 and C10 alkyl groups, which are present in a ratio of approximately 1:1 (molar)) is used as the base oil, and p,p'-dioctyldiphenylamine is used as the amine antioxidant (Amin. AO). Trimellitic acid ester B is a base oil A. Designation Oil 1 Oil 2 Oil 3 Oil 4 Amin.
  • the shear viscosity is determined at 25°C at a shear rate of 300 1/s according to DIN 53019-1.3.
  • the open dish test is carried out with aluminum evaporation dishes with a diameter of 50 mm. 5 g +/- 0.1 g are weighed in. The measurement is carried out in a convection oven. The measurement is carried out over 24/48/72 hours. The evaporation loss is determined and the shear viscosity is measured in each case.
  • Oils 2, 3, 4, 5 and 6 represent lubricant compositions from which lubricating grease compositions according to the invention can be obtained by combination with the thickener.
  • Base oil PAO 8/ trimellitic acid ester B with linear C8 and C10 alkyl groups (ratio of the two base oils 60:40). PAO 8 has an oxygen/carbon ratio of 0. The trimellitic acid ester B has an oxygen/carbon ratio of 0.22. This gives the base oil a Oxygen/carbon ratio of 0.088 Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil mixture described here is not suitable for producing a lubricating grease composition according to the invention because the proportion of base oil A is too low and therefore the solubility of N1888fsi is too low.
  • the trimellitic acid ester B has an oxygen/carbon ratio of 0.22. This gives the base oil a Oxygen/carbon ratio of 0.15 Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil mixture described here is suitable for producing a lubricating grease composition according to the invention because a sufficient proportion of base oil A is present and thus the solubility of N1888fsi is sufficient.
  • the trimellitic acid ester B has an oxygen/carbon ratio of 0.22. This gives the base oil a Oxygen/carbon ratio of 0.18 Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil mixture described here is suitable for producing a lubricating grease composition according to the invention because a sufficient proportion of base oil A is present and thus the solubility of N1888fsi is sufficient.
  • Base oil Trimellitic acid ester B with linear C8 and C10 alkyl groups. The trimellitic acid ester B has an oxygen/carbon ratio of 0.22. Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil described here is suitable for producing a lubricating grease composition according to the invention because a sufficient proportion of base oil A is present and therefore the solubility of N1888fsi is very good.
  • the examples show that the ionic liquid N1888fsi is miscible with the trimellitic acid ester over a very wide concentration range.
  • Base oil polypropylene oxide homopolymer (non-polar), butanol started, kinematic viscosity at 40°C approx. 120 mm 2 /sec with oxygen/carbon ratio of 0.44 Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil described here is not suitable for producing a lubricating grease composition according to the invention because no proportion of base oil A is present and therefore the solubility of N1888fsi is not sufficient.
  • Base oil polypropylene oxide homopolymer (non-polar), butanol initiated, kinematic viscosity at 40°C approx. 120 mm 2 /sec/ trimellitic acid ester B with linear C8 and C10 alkyl groups (polar) mixing ratio based on mass percent 50:50.
  • Oxygen/carbon ratio of 0.22 of the base oil is 0.33.
  • Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • the base oil mixture described here is suitable for producing a lubricating grease composition according to the invention because a sufficient proportion of base oil A is present and thus the solubility of N1888fsi is sufficient.
  • Base oil Hydrogenated dimer acid ester (non-polar), alcohol component 2-ethylhexanol. Oxygen/carbon ratio is 0.10. Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt. % 10 wt.
  • the base oil described here is not suitable for producing a lubricating grease composition according to the invention because no proportion of base oil A is present and therefore the solubility of N1888fsi is not sufficient.
  • Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • N1888fsi is readily soluble in base oils with a polar base oil content of more than 50% by weight, even in larger quantities.
  • the polar base oils are selected from esters and polyalkylene glycols produced with ethylene oxide as a component of the reaction mixture.
  • Example 9 A base grease C and, from this, a non-inventive grease 9 are produced:
  • the base grease C is classified as NLGI class 1.
  • the base oil has a kinematic viscosity of 130 mm 2 /sec at 40°C and is a non-polar mixture of mineral oil/PAO.
  • the oxygen/carbon ratio is almost 0.
  • the thickener is a mixture of urea/calcium complex soap.
  • the product contains the usual additives for oxidative stabilization, to improve load-bearing capacity and to protect against corrosion.
  • the addition of the ionic liquid does not improve the service life; the L 50 value is even reduced. It has been shown that in greases whose base oil is non-polar (mineral oil and PAO), no improvement is achieved by using the ionic liquid.
  • the weight proportion of trimellitic acid ester A in the total base oil is 52.6 wt.%.
  • method standard Unit Example grease D + 3 % N8881 fsi according to invention
  • Example grease D Comparison grease General data Walk penetration 60 DT ISO 2137 1/10mm 283 273 Dropping point ISO 2176 °C Greater than 300°C Greater than 300°C Flow pressure at -40°C DIN51805 mBar 537 825 Oil separation after 30h/150°C ASTM D6184 Wt % 7.3 5.8 specific resistance DIN 53482 [ohm*cm] 9.68E+07 3.88E+10 Evaporation loss, 24 h/180°C DIN58397 % 15.6 11.4 Shear viscosity at 25°C, shear rate 300 1/s, fresh DIN53019-1,3 mPas 5300 5800 Shear viscosity at 25°C, shear rate 300 1/s, after evaporation loss test 24 h/180°C according to DIN 58397 DIN53019
  • composition according to the invention shows advantages in terms of reducing the specific resistance, the low-temperature behavior (flow pressure) and the avoidance of hardening when stored at 180°C (no increase in dynamic viscosity)
  • Estolid base oil homopolymer 12-hydroxystearic acid, esterified with 2-ethylhexanol, kinematic viscosity at 40°C approx. 148 mm 2 /s; the oxygen/carbon ratio is 0.17 Quantity N1888fsi 0 wt. % 1 wt. % 3 wt. % 5 wt.
  • N8881 fsi is soluble in the estolide base oil in the concentration range investigated. With increasing amount of IL, the specific resistance is reduced.
  • lubricating grease compositions containing ionic liquids based on fsi as an anion achieve performance values that are in the range of a product additived with ionic liquids based on bta.
  • Ionic liquids based on fsi are therefore a good alternative to ionic liquids containing bta.
  • fsi-based additives have the advantage over bta-containing additives of not containing any persistent CFx groups.
  • the difference in performance between the two ionic liquids is significantly smaller when they are used as additives in grease.
  • the values of the tested properties show that the P666(14) fsi has a very similar performance effect in the grease system under consideration as P666(14) bta. Requirements for high and low temperature properties as well as for electrical conductivity can be met with the fsi material as an additive in the temperature ranges under consideration.
  • grease compositions containing ionic liquids based on fsi are, in terms of their performance, a good alternative to grease compositions containing ionic liquids containing bta.
  • the grease compositions according to the invention do not contain any persistent CFx groups and are therefore biodegradable.
  • JPI-5S-68-11 is used to determine the oxygen content.
  • the oxygen/carbon weight ratio is obtained from the oxygen mass fraction (wt%), determined according to JPI-5S-68-11, divided by the carbon fraction (wt%), determined according to ASTM D 5291:2021.
  • N1888 fsi is insoluble in base oil or base oil at a certain concentration if the turbidity value in the turbidity measurement according to DIN EN ISO 7027 -1:2016-11 at 25°C is more than 1 FNU higher than for pure base oil or base oil.
  • N1888 fsi is also insoluble in base oil or base oil at a certain concentration if two or more phases form. N1888 fsi is soluble in base oil or base oil at a certain concentration if the turbidity measurement according to DIN EN ISO 7027-1:2016-11 at 25°C the turbidity value is no more than 1 FNU higher than that of pure base oil or base oil.

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Claims (29)

  1. Composition lubrifiante comprenant :
    a) 20 à 96,5% en poids, par rapport au poids total de la composition lubrifiante, d'une huile de base, l'huile de base présentant une huile de base A en une proportion d'au moins 50% en poids, par rapport au poids total de l'huile de base, l'huile de base A étant un ester et/ou un polyglycol, de préférence un polyglycol, contenant des motifs d'éthylène non substitués en tant que groupe carboné dans le motif récurrent,
    b) 0,5 à 80% en poids, par rapport au poids total de la composition lubrifiante, d'un liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide,
    c) 3 à 35% en poids, par rapport au poids total de la composition lubrifiante, d'un épaississant, choisi parmi l'urée, les savons simples de lithium, les savons complexes métalliques des éléments du 1er et du 2e groupe principal du système périodique, en particulier les savons complexes de lithium et leurs mélanges.
  2. Composition lubrifiante selon la revendication 1, caractérisée en ce que l'huile de base présente, à une température ambiante de 20°C, une solubilité pour le liquide ionique bis(fluorosulfonyl)imide de méthyltrioctylammonium d'au moins 3% en poids et/ou l'huile de base A présente, à une température ambiante de 20°C, une solubilité pour le liquide ionique bis(fluorosulfonyl)imide de méthyltrioctylammonium d'au moins 3% en poids.
  3. Composition lubrifiante selon la revendication 1 ou 2, caractérisée en ce que l'huile de base A se trouve en une proportion de 50 à 100% en poids et/ou en une proportion supérieure à 55% en poids, par exemple de 55 à 100% en poids et/ou en une proportion supérieure à 60% en poids, par exemple de 60 à 100% en poids, plus préférablement en une proportion supérieure à 70% en poids, par exemple de 70 à 100% en poids, à chaque fois par rapport au poids total de l'huile de base.
  4. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que la proportion de l'huile de base, par rapport au poids total de la composition lubrifiante, est de 40% en poids à 95% en poids, plus préférablement de 60% en poids à 90% en poids, encore plus préférablement de 70% en poids à 95% en poids et en particulier de 75% en poids à 85% en poids.
  5. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que la proportion de l'huile de base A, par rapport au poids total de la composition lubrifiante, est de 10% en poids à 96,5% en poids, plus préférablement de 35% en poids à 95% en poids, encore plus préférablement de 40% en poids à 90% en poids, en particulier de 35% en poids à 85% en poids.
  6. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'ester présente un rapport en poids oxygène/carbone supérieur à 0,1, par exemple de 0,2 à 0,35 et/ou le polyglycol présente un rapport en poids oxygène/carbone supérieur à 0,44, par exemple de 0,44 à 0,70.
  7. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que le polyglycol est choisi parmi les homopolymères d'oxyde d'éthylène en tant que monomère unique et/ou les copolymères présentant des groupes éthyle non substitués et des groupes 1-méthyléthyle en tant que groupes carbonés dans le motif récurrent, la proportion en poids des motifs d'éthylène non substitués dans les copolymères étant de préférence d'au moins 20% en poids, par exemple de 20% en poids à 90% en poids, de préférence d'au moins 30% en poids, par exemple de 30% en poids à 90% en poids, par rapport au poids total du polyglycol et les groupes terminaux des polyglycols, indépendamment les uns des autres, étant de préférence des groupes hydroxyde et/ou des groupes C1-C20-alcoxyde.
  8. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'ester est choisi parmi les esters d'acides carboxyliques, de préférence les monoesters, les diesters, les triesters, les tétraesters, les pentaesters, les polyesters, de préférence les estolides et leurs mélanges.
  9. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'ester est choisi dans le groupe constitué par les esters aliphatiques d'acides monocarboxyliques aliphatiques présentant un nombre d'atomes de carbone de C5 à C22 avec un trialcool, tétraalcool, hexaalcool aliphatique, seuls ou en mélange, présentant un nombre d'atomes de carbone de C3 à C10, en particulier le triméthylolpropane, le pentaérythritol et/ou le dipentaérythritol et/ou les esters aliphatiques d'acides dicarboxyliques aliphatiques, présentant un nombre d'atomes de carbone de C6 à C20, avec un monoalcool et/ou dialcool aliphatique, seuls ou en mélange, présentant un nombre d'atomes de carbone de 6 à 22, les estolides et les esters aromatiques d'acides tricarboxyliques et tétracarboxyliques aromatiques avec des alcools aliphatiques en C7-C22, seuls ou en mélange, et leurs mélanges.
  10. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'huile de base contient l'huile de base A en mélange avec une huile de base B, l'huile de base B présentant, à une température ambiante de 20°C, une solubilité pour le liquide ionique bis(fluorosulfonyl)imide de méthyltrioctylammonium inférieure à 3% en poids.
  11. Composition lubrifiante selon la revendication 10, caractérisée en ce que l'huile de base B est une huile de base B1 qui présente un rapport en poids oxygène/carbone d'au plus 0,1, de préférence de 0 à 0,1 et/ou en ce que l'huile de base B est une huile de base B2 qui présente une proportion d'halogènes et/ou de silicium de plus de 5% en poids, par rapport au poids total de l'huile de base B2.
  12. Composition lubrifiante selon la revendication 10 ou 11, caractérisée en ce que l'huile de base B est choisie dans le groupe constitué par les huiles de base des groupes I, II, II+, III, IV et parmi les huiles de base suivantes du groupe V selon la classification du American Petroleum Institute (API) [NLGI Spokesman, N. Samman, Volume 70, numéro 11, page 14 et suivantes], à savoir les diphényléthers, les naphtalènes alkylés, les polyisobutylènes, les huiles de silicone, les polytétrahydrofurannes et les polymères d'oxétane, les polyalkylèneglycols, qui présentent des motifs d'éthylène substitués par des groupes alkyle aliphatiques et/ou aromatiques, la proportion en poids de motifs d'éthylène non substitués dans les polyalkylèneglycols étant inférieure à 20% en poids par rapport au poids total du polyalkylèneglycol et les esters aliphatiques d'acides dicarboxyliques aliphatiques, présentant un nombre d'atomes de carbone de C22 à C40, de préférence de C34 à C38 avec un monoalcool et/ou dialcool aliphatique, seuls ou en mélange, présentant un nombre d'atomes de carbone de 6 à 22, les esters aliphatiques d'acides tricarboxyliques aliphatiques, présentant un nombre d'atomes de carbone de C33 à C60, de préférence de C50 à C58 avec un monoalcool et/ou dialcool aliphatique, seuls ou en mélange, présentant un nombre d'atomes de carbone de 6 à 22 et leurs mélanges.
  13. Composition lubrifiante selon l'une ou plusieurs des revendications 10 à 12, caractérisée en ce que la proportion de l'huile de base B est d'au plus 48% en poids, par exemple de 5 à 48% en poids, plus préférablement d'au plus 40% en poids, par exemple de 10% en poids à 40% en poids, en particulier d'au plus 30% en poids, par exemple de 10 à 30% en poids, à chaque fois par rapport au poids total de la composition lubrifiante et/ou le rapport en poids entre l'huile de base A et l'huile de base B est d'au moins 50:50, de manière particulièrement préférée d'au moins 60:40, encore plus préférablement d'au moins 70:30, en particulier d'au moins 80:20.
  14. Composition lubrifiante selon l'une ou plusieurs des revendications 10 à 13, caractérisée en ce que le rapport en poids entre l'huile de base A et l'huile de base B est de 50:50 à 60:40 et la proportion de liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide, est de 0,5 à 10% en poids, par rapport au poids total de la composition lubrifiante et/ou le rapport en poids entre l'huile de base A et l'huile de base B est de 60:40 à 70:30 et la proportion de liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide, est de 0,5% en poids à 15% en poids, par rapport au poids total de la composition lubrifiante et/ou le rapport en poids entre l'huile de base A et l'huile de base B est de 70:30 à 90:10 et la proportion de liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide, est de 0,5% en poids à 40% en poids, par rapport au poids total de la composition lubrifiante et/ou le rapport en poids entre l'huile de base A et l'huile de base B est de 80:20 à 90:10 et la proportion de liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide, est de 0,5% en poids à 80% en poids, par rapport au poids total de la composition lubrifiante.
  15. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée par une viscosité cinématique à 40°C de 20 mm2/sec à 1500 mm2/sec, de préférence de 20 mm2/sec à 320 mm2/sec.
  16. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que le liquide ionique présente un cation choisi dans le groupe constitué par les ions d'ammonium, NR1R2R3R4+, et les ions de phosphonium, PR1R2R3R4+, symétriques et asymétriques, les radicaux R1 à R4 pouvant être, indépendamment les uns des autres, des groupes alkyle en C1-C24, de préférence en C1-C18, de manière particulièrement préférée en C6-C18, ramifiés ou non ramifiés, substitués ou non substitués ou des groupes aryle en C6-C30.
  17. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce qu'elle ne présente pas de liquides ioniques, dont l'anion n'est pas le bis (fluorosulfonyl) imide ou présente des liquides ioniques dont l'anion n'est pas le bis(fluorosulfonyl)imide, en une proportion d'au plus 0,5% en poids, par rapport au poids total de la composition lubrifiante.
  18. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce qu'elle ne présente pas de liquide ionique, qui contient des groupes perfluoroalkyle ou présente des liquides ioniques qui contiennent des groupes perfluoroalkyle, en une proportion d'au plus 0,5% en poids, par rapport au poids total de la composition lubrifiante.
  19. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que le liquide ionique, dont l'anion est le bis(fluorosulfonyl)imide, est choisi dans le groupe constitué par :
    bis(fluorosulfonyl)imide de trihexyl(tétradécyl)phosphonium
    Figure imgb0022
    le bis(fluorosulfonyl)imide de méthyltrioctylammonium
    Figure imgb0023
    le bis(fluorosulfonyl)imide de tributyltétradécylphosphonium
    Figure imgb0024
    le bis(fluorosulfonyl)imide de tétraoctylphosphonium
    Figure imgb0025
    et leurs mélanges.
  20. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que la proportion d'épaississant est de 4 à 30% en poids, par rapport au poids total de la composition lubrifiante.
  21. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que la composition lubrifiante contient 20 à 92,5% en poids, par rapport au poids total de la composition lubrifiante, d'huile de base ainsi que 4 à 20% en poids, par rapport au poids total de la composition lubrifiante d'un autre épaississant, de préférence choisi parmi les savons complexes d'aluminium, la bentonite, le sulfonate, le silicate, le polyimide ainsi que leurs mélanges.
  22. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'urée est une urée qui est un produit de réaction d'un diisocyanate, de préférence le 2,4-diisocyanatotoluène, le 2,6-diisocyanatotoluène, le 4,4'-diisocyanatodiphénylméthane, le 2,4'-diisocyanatodiphénylméthane, le 4,4'-diisocyanatodiphényle, le 4,4'-diisocyanato-3,3'-diméthyldiphényle, le 4,4'-diisocyanato-3,3'-diméthylphénylméthane, qui peuvent être utilisés seuls ou en combinaison, avec une amine ou une diamine de formule générale (H2N)xR, dans laquelle x = 1 ou 2 et R représente un radical aryle, alkyle, cycloalkyle ou alkylène comprenant 2 à 22 atomes de carbone, qui sont présentes seules ou en combinaison.
  23. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'urée est une di-urée, qui contient des urées aliphatiques, cycloaliphatiques/aliphatiques et/ou cycloaliphatiques, de préférence une di-urée représentée par la formule A,
    Figure imgb0026
     dans laquelle R2 représente un radical hydrocarboné bivalent aromatique en C6-C15 ; et R1 et R3 représentent, indépendamment l'un de l'autre, un radical C6-20-cycloalkyle, en particulier un radical cyclohexyle ou un radical C8-20-alkyle linéaire ou ramifié.
  24. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que le savon complexe de lithium est un savon complexe de lithium préparé à partir d'acides dicarboxyliques en C4-C36, de préférence l'acide azélaïque, l'acide sébacique, l'acide subérique, l'acide téréphtalique, l'acide dodécanedioïque et/ou à partir d'acides carboxyliques à fonctionnalité supérieure comprenant 3 ou plus, de préférence 3 à 4 groupes d'acide carboxylique, le nombre de groupes carbonés pouvant être de 6 à 60, comme par exemple l'acide citrique et les acides trimère et/ou à partir de composés ester, en particulier les esters méthyliques et/ou les triglycérides d'un ou de plusieurs des acides susmentionnés, à chaque fois combinés avec un ou plusieurs acides monocarboxyliques, de préférence combinés avec un ou plusieurs acides monocarboxyliques en C4-C24, de préférence l'acide stéarique, l'acide hydroxystéarique, en particulier l'acide 12-hydroxystéarique, l'acide palmitique, l'acide oléique, l'acide salicylique, les composés d'ester, en particulier les esters méthyliques et/ou les triglycérides d'un ou de plusieurs des acides susmentionnés et/ou combinés avec un monostéarylamide de l'acide sébacique et/ou un monostéarylamide de l'acide téréphtalique.
  25. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée en ce qu'elle contient, comme additif, une amine aromatique, de préférence choisie parmi la diphénylamine styrénisée, la phényl-alpha-naphtylamine, la phényl-bêta-naphtylamine, la diphénylamine octylée et/ou butylée, en particulier la p,p'-dioctyldiphénylamine, la diphénylamine nonylée, de préférence en une proportion de 0,5% en poids à 23% en poids, plus préférablement de 0,5% en poids à 20% en poids, en particulier de 0,5% en poids à 10% en poids, par rapport au poids total de la composition lubrifiante.
  26. Composition lubrifiante selon l'une ou plusieurs des revendications précédentes, caractérisée par une température d'utilisation inférieure de pas plus de -30°C, de préférence de pas plus de -40°C selon IP 186, édition 2015 et/ou une température d'utilisation supérieure d'au moins +160°C, de préférence d'au moins +180°C DIN 51821 1+2, édition 2016,7.
  27. Utilisation d'une composition lubrifiante selon l'une ou plusieurs des revendications précédentes pour la lubrification d'éléments d'entraînement, de préférence de paliers de cylindre, de transmissions, de paliers lisses, d'actionneurs et/ou de chaînes, des potentiels électriques étant de préférence appliqués aux éléments d'entraînement.
  28. Utilisation selon la revendication 27, caractérisée en ce que les éléments d'entraînement sont choisis parmi les paliers de poulie, les paliers de ventilateur, les paliers de pompe à vide, les paliers de cylindre de moteurs électriques, en particulier de véhicules hybrides et électriques, les générateurs, en particulier de véhicules électriques et ferroviaires, les éoliennes, les moteurs industriels, les groupes auxiliaires dans les véhicules et/ou les articulations de véhicules.
  29. Utilisation selon la revendication 27 ou 28, caractérisée en ce que la composition lubrifiante est utilisée pour la lubrification d'éléments d'entraînement, de préférence de paliers de cylindre, pour lesquels une température d'utilisation inférieure de pas plus de -30°C, de préférence de pas plus de -40°C selon IP 186, édition 2015 et/ou de préférence une température d'utilisation supérieure d'au moins +160°C, de préférence d'au moins +180°C (déterminée selon DIN 51821 1+2, édition 2016,7) est/sont nécessaire(s).
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US18/997,186 US12612575B2 (en) 2022-07-21 2023-05-11 Lubricating grease composition containing an ionic fluid
CN202380055136.XA CN119907848A (zh) 2022-07-21 2023-05-11 包含离子液体的润滑脂组合物
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