Lubricating grease composition containing an ionic liquid

Abstract

A lubricating grease composition comprising: a) 20 to 96.5% by weight of a base oil based on the total weight of the lubricating grease composition, the base oil having at least 50% by weight of base oil A based on the total weight of the base oil, and base oil A being an ester and / or polyglycol, preferably a polyglycol containing unsubstituted ethylene units as carbon groups in the repeating unit; 20 to 96.5% by weight of a base oil based on the total weight of the lubricating grease composition; b) 0.5 to 80% by weight of an ionic liquid based on the total weight of the lubricating grease composition, wherein the anion is bis(fluorosulfonyl)imide; and c) 3 to 35% by weight of a thickener selected from urea, lithium simple soap, metal-complex soaps of elements of main groups 1 and 2 of the periodic table, particularly lithium complex soaps and mixtures thereof, based on the total weight of the lubricating grease composition.

Description

Technical Field

[0001] The present invention relates to a lubricating grease composition containing an ionic liquid and its use.

[0002] Ionic liquids are known to be usable as additives in lubricants such as lubricating greases and lubricating oils. Thereby, it is possible to favorably affect tribology-related properties such as friction, wear, and conductivity. In particular, good results are obtained with ionic liquids having a group containing CFx. These groups are usually contained in anions and improve their heat load capacity and conductivity as additives in lubricants. Bis(trifluoromethylsulfonyl)imide (bta) is an important representative example of these anions due to its very excellent heat resistance and hydrolysis resistance.

[0003] However, the drawback of compounds containing CFx is that these groups are not biodegradable, and as a result, ionic liquids containing such groups are hardly decomposable.

[0004] From European Patent Application Publication No. 3872154, a) a lubricant (Schmiermittel), in particular a lubricant containing a non-polar base oil (Basisoel), and b) a first ionic liquid made from 1-decene as a monomer component, in particular soluble in PAO400 / 40, and c) a second ionic liquid made from 1-decene as a monomer component, in particular insoluble in PAO400 / 40 is known as a lubricant composition (Schmierstoffzusammensetzung).

[0005] As a possible second ionic liquid, trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide is particularly mentioned. However, it is known to those skilled in the art that bis(fluorosulfonyl)imide (fsi)-based ionic liquids as anions have significantly lower thermal resistance than ionic liquids containing a CFx group. This can mainly be explained by the lack of strong carbon-fluorine bonds in the fsi anion, which has an adverse effect on the stability of the whole molecule.

[0006] The disadvantages of the described lubricant composition are further that the use of two different ionic liquids increases the complexity of the manufacturing process and the associated manufacturing costs, and that the lubricant composition is limited to non-polar base oils. Certainly, non-polar base oils may also have polar components. However, this is always less than 50% by weight based on the total weight of the base oil.

[0007] European Patent No. 2164935 describes the use of a selected ionic liquid having a fluorine-containing anion in a lubricating grease composition to reduce the aging phenomenon of the lubricant and reduce the electrical resistance.

[0008] The object of the present invention is to provide a lubricant composition in which the use of bta-containing ionic liquids can be omitted and which still has good tribology-related properties with respect to friction, wear and conductivity. Furthermore, this lubricant composition has sufficient temperature stability, preferably at least 180 °C, and it is desirable to contain a high proportion of polar base oil.

[0009] This object is achieved by a lubricating grease composition, a) a base oil (Grundoel) of 20 to 96.5% by weight based on the total weight of the lubricating grease composition, the base oil having at least 50% by weight of base oil A based on the total weight of the base oil, and base oil A being an ester and / or a polyglycol, preferably a polyglycol containing unsubstituted ethylene units as carbon groups in the repeating unit, as the base oil, b) 0.5 to 80% by weight, based on the total weight of the lubricating grease composition, of an ionic liquid in which the anion is bis(fluorosulfonyl)imide, and c) 3 to 35% by weight, based on the total weight of the lubricating grease composition, of a thickener selected from urea, lithium simple soaps, metal-complex soaps of elements of main groups 1 and 2 of the periodic table, in particular lithium complex soaps and mixtures thereof is solved by a lubricating grease composition comprising

[0010] According to the present invention, it has been found that by using the lubricating grease composition according to the present invention, it is possible to omit the use of an ionic liquid containing bta and still obtain good tribology-related properties with respect to friction, wear and conductivity. Furthermore, the lubricating grease composition can contain a polar base oil in a high proportion, which further has sufficient temperature stability, advantageously at least 180 °C. Since ionic liquids based on bis(fluorosulfonyl)imide as anions are known to have only slight thermal stability, the high temperature stability of the lubricating grease composition according to the present invention was surprising. Regardless of the mechanism, the surprisingly high thermal stability of bis(fluorosulfonyl)imide as an anion in the lubricant according to the present invention is presumed to be due to solubilization by a stabilizing base oil. Stabilization by preventing or delaying autocatalysis by the base oil is also conceivable.

[0011] According to the present invention, the lubricating grease composition preferably contains a base oil having a solubility of at least 3% by weight with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20 °C. This solubility indicates the high polarity of the base oil. Furthermore, base oil A preferably also has a solubility of at least 3% by weight with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20 °C. The solubility with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide is advantageously carried out as described in the chapter on test methods.

[0012] The base oil can include one or more base oils A and optionally a base oil different from base oil A. However, according to the present invention, the lubricating grease composition preferably does not have other base oils in addition to the base oil.

[0013] In a preferred embodiment of the present invention, the base oil has a solubility of at least 3 wt%, preferably at least 5 wt%, even more preferably at least 10 wt% with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20°C.

[0014] In another preferred embodiment of the present invention, the base oil has a solubility in the range of at least 3 wt% to 30 and / or at least 5 wt% to 30 wt%, and / or at least 10 wt% to 30 wt%, and / or at least 3 wt% to 20 wt%, and / or at least 5 wt% to 20 wt%, and / or at least 10 wt% to 20 wt%, and / or at least 3 wt% to 15 wt% and / or at least 5 wt% to 15 wt%, and / or at least 10 wt% to 15 wt% with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20°C.

[0015] In a preferred embodiment of the present invention, base oil A has a solubility of at least 3 wt%, preferably at least 5 wt%, even more preferably at least 10 wt% with respect to the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20°C.

[0016] In another preferred embodiment of the present invention, base oil A has a solubility in ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20 °C in the range of at least 3 wt% to 99 and / or in the range of at least 5 wt% to 99 wt% and / or in the range of at least 10 wt% to 99 wt% and / or in the range of at least 3 wt% to 80 wt% and / or in the range of at least 5 wt% to 80 wt%, and / or in the range of at least 10 wt% to 80 wt%, and / or in the range of at least 3 wt% to 15 wt% and / or in the range of at least 5 wt% to 15 wt% and / or in the range of at least 10 wt% to 15 wt%.

[0017] In a preferred embodiment, base oil A is present in each case in a proportion of 50 to 100 wt% and / or more than 55 wt%, for example in a proportion of 55 to 100 wt%, and / or more than 60 wt%, for example in a proportion of 60 to 100 wt%, more preferably more than 70 wt%, for example in a proportion of 70 to 100 wt%, based on the total weight of the base oil.

[0018] The proportion of the base oil based on the total weight of the lubricating grease composition is 20 wt% to 96.5 wt%, preferably 40 wt% to 95 wt%, more preferably 60 wt% to 90 wt%, even more preferably 70 wt% to 95 wt%, particularly 75 wt% to 85 wt%.

[0019] The proportion of base oil A based on the total weight of the lubricating grease composition is advantageously 10 wt% to 96.5 wt%, more preferably 35 wt% to 95 wt%, even more preferably 40 wt% to 90 wt%, particularly 35 wt% to 85 wt%.

[0020] In a preferred embodiment, the base oil A is an ester and / or a polyglycol, and the polyglycol is preferably a polyglycol containing unsubstituted ethylene units as carbon groups in the repeating units. A particularly preferred polyglycol is a polyalkylene glycol containing unsubstituted ethylene units as carbon groups in the repeating units, and preferably a polyalkylene glycol containing unsubstituted ethylene units and methyl-substituted ethylene units as carbon groups in the repeating units. Similarly preferred polyglycols are polyalkylene glycols containing unsubstituted ethylene units as carbon groups in the repeating units, and the weight ratio of the unsubstituted ethylene units is preferably at least 20% by weight, for example 20% to 100% by weight, preferably at least 30% by weight, for example 30% to 100% by weight, based on the total weight of the polyglycol.

[0021] In a preferred embodiment, the ester has an oxygen / carbon weight ratio greater than 0.1, for example 0.1 to 0.35, preferably greater than 0.15 to 0.30, and / or the polyglycol has an oxygen / carbon weight ratio greater than 0.44, for example 0.44 to 0.70, preferably greater than 0.50, for example 0.50 to 0.68.

[0022] Particularly preferred polyglycols are selected from homopolymers from ethylene oxide as the only monomer and / or copolymers having unsubstituted ethyl groups and 1-methylethyl groups as carbon groups in the repeating units, and the weight ratio of unsubstituted ethylene units in the copolymer is preferably at least 20% by weight, for example 20% to 90% by weight, more preferably at least 30% by weight, for example 30% to 90% by weight, based on the total weight of the polyglycol. The end groups of particularly preferred polyglycols are, independently of each other, preferably hydroxide groups and / or C1-C20 alkoxide groups, preferably C1-C6 alkoxide groups. The alkoxide end groups may be further substituted. The end groups can be introduced during the production of the polyglycol by reacting the monomer ethylene oxide with a monofunctional starter. The monofunctional starter is preferably water and alcohols, especially butanol. It is also possible to link two or more chains of the polyglycol via end groups. As the linking end groups, alkyl groups are preferred. This can be done when producing polyglycol from ethylene oxide using a nucleophilic bifunctional or higher-functional starter. Examples of bifunctional starters are diols, especially 1,2-ethanediol.

[0023] Preferred esters are carboxylic acid esters, preferably mono-esters, di-esters, tri-esters, tetra-esters, penta-esters, polyesters, preferably estolides. Particularly preferred are di-esters, tri-esters, tetra-esters, penta-esters, polyesters, estolides and mixtures thereof. Similarly preferred carboxylic acid esters are preferably aromatic esters of aromatic C8 - C20, preferably C8 - C10 di-, tri- or tetra-carboxylic acids with aliphatic C7 - C22 alcohols present singly or as a mixture, and preferably aliphatic C4 - C22 mono-carboxylic acids and / or di-carboxylic acids with aliphatic mono-, di-, tri-, tetra-, penta-, hexa-alcohols having from 3 to 22 carbon atoms present singly or as a mixture, 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 ester each independently preferably has from C3 - C54 carbon atoms. Preferred acid components have from C4 - C22 carbon atoms, preferred alcohol components have from C3 - C22 carbon atoms, and / or preferred hydroxycarboxylic acid components have from C14 - C22 carbon atoms. Preferred di-esters are those in which the acid component has less than 36 carbon atoms, preferably from 6 to 20 carbon atoms, even more preferably from 6 to 12 carbon atoms. The advantage of these esters is their good solubility in the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide.

[0024] Estride is an oligomer of an oligomeric aliphatic hydroxycarboxylic acid, preferably 12-hydroxystearic acid, or an unsaturated carboxylic acid, preferably oleic acid, and the terminal carboxylic acid groups are esterified with a monoalcohol, diol, triol and / or tetraalcohol, preferably a branched monoalcohol, very preferably geraniol, and any free hydroxide groups that may be present may be esterified by reaction with a monocarboxylic acid or dicarboxylic acid. Particularly preferred are aliphatic esters of monocarboxylic acids and / or dicarboxylic acids having from C3 to C20, preferably from C6 to C20 carbon atoms, and mono-, di-, tri-, tetra-, penta- and / or hexaalcohols present individually or as a mixture having from 3 to 22 carbon atoms.

[0025] In a particularly preferred embodiment, the ester is selected from the group consisting of aliphatic esters of an aliphatic monocarboxylic acid having from C5 to C22 carbon atoms and aliphatic tri-, tetra-, hexaalcohols present individually or as a mixture having from C3 to C10 carbon atoms, in particular trimethylolpropane, pentaerythritol and / or dipentaerythritol, and / or aliphatic esters of an aliphatic dicarboxylic acid having from C6 to C20 carbon atoms and aliphatic mono- and / or dialcohols present individually or as a mixture having from 6 to 22 carbon atoms, estride and aromatic esters of aromatic tri- and tetracarboxylic acids and an aliphatic C7 to C22 alcohol present individually or as a mixture and mixtures thereof.

[0026] Base oils equally suitable according to the invention comprise base oil A in a mixture with base oil B. Base oil B preferably has a solubility in the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide of less than 3% by weight, for example from 0.1% to 3% by weight, preferably less than 2.5% by weight, for example from 0.01% to 2.5% by weight, even more preferably less than 2% by weight, for example from 0.01% to 2% by weight, even more preferably less than 1% by weight, for example from 0.01% to 1% by weight, at room temperature of 20 °C.

[0027] In another preferred embodiment, the base oil B is more than 5% by weight, for example 5% to 30% by weight, preferably 10% to 25% by weight, based on the total weight of the base oil B1 having an oxygen / carbon weight ratio of at most 0.1, for example 0 to 0.1, and / or the base oil B2 having a proportion of halogen and / or silicon.

[0028] When the base oil contains the base oil A in a mixture with the base oil B, the proportion of the base oil A is more than 50% by weight, for example 50 to 90% by weight, even more preferably more than 60% by weight, for example 60 to 85% by weight, particularly more than 70% by weight, for example 70 to 85% by weight, based on the total weight of the base oil.

[0029] Preferred base oil B consists of the group consisting of Group I, II, II+, III, IV base oils according to the classification of the American Petroleum Institute (API) [NLGI Spokesman, N. Samman, Volume 70, Number 11, p.14ff], and subsequent Group V base oils, namely diphenyl ether, alkylated naphthalene, polyisobutylene, silicone oil, polytetrahydrofuran and oxetane polymer, polyalkylene glycol having ethylene units substituted with aliphatic and / or aromatic alkyl groups, wherein the weight ratio of unsubstituted ethylene units in the polyalkylene glycol is less than 20% by weight based on the total weight of the polyalkylene glycol, polyalkylene glycol, and aliphatic dicarboxylic acids having 22 to 40 carbon atoms, preferably 34 to 38 carbon atoms, and aliphatic mono- and / or dialcohols having 6 to 22 carbon atoms present individually or as a mixture, aliphatic esters, aliphatic tricarboxylic acids having 33 to 60 carbon atoms, preferably 50 to 58 carbon atoms, and aliphatic mono- and / or dialcohols having 6 to 22 carbon atoms present individually or as a mixture, aliphatic esters and mixtures thereof. Particularly preferred base oils are alkylated diphenyl ether, polyisobutylene, polyalphaolefin and mixtures thereof. The base oil may be composed of a mixture of the aforementioned base oils.

[0030] When present, the proportion of base oil B is advantageously less than 50% by weight, for example 10 to 49% by weight, even more preferably at most 40% by weight, for example 10% to 40% by weight, particularly at most 30% by weight, for example 10 to 30% by weight, based on the total weight of the base oil.

[0031] When present, the proportion of base oil B is advantageously at most 48% by weight, for example 5 to 48% by weight, even more preferably at most 40% by weight, for example 10% to 40% by weight, particularly at most 30% by weight, for example 10 to 30% by weight, based on the total weight of the lubricating grease composition.

[0032] The lubricating grease composition according to the present invention preferably has a kinematic viscosity of 20 mm 2 / s to 1500 mm 2 / s, preferably 20 mm 2 / s to 320 mm 2 / s, and even more preferably 25 mm 2 / s to 220 mm 2 / s, and even more preferably 30 mm 2 / s to 150 mm 2 / s. The kinematic viscosity is measured according to ASTM D 7042, January 2021 edition.

[0033] According to the present invention, the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide is 0.5% by weight to 80% by weight, even more preferably 2% by weight to 40% by weight, even more preferably 2% by weight to 20% by weight, even more preferably 3% by weight to 15% by weight, and particularly 5% by weight to 10% by weight based on the total weight of the lubricating grease composition.

[0034] In a preferred embodiment, the base oil contains base oil A and base oil B in a weight ratio of at least 50:50, for example 50:50 to 60:40, even more preferably at least 60:40, for example 60:40 to 70:30, even more preferably at least 70:30, for example 70:30 to 90:10, and particularly at least 80:20, for example 80:20 to 90:10.

[0035] In another preferred embodiment, the base oil contains base oil A and base oil B in a weight ratio of 50:50 to 60:40, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide (fsi) is 0.5 to 10% by weight, preferably 3 to 10% by weight, based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 60:40 to 70:30, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide (fsi) is 0.5% to 15% by weight, preferably 3% to 15% by weight, based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 70:30 to 90:10, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide (fsi) is 0.5% to 40% by weight, preferably 3% to 20% by weight, based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 80:20 to 90:10, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide (fsi) is 0.5% to 80% by weight based on the total weight of the lubricating grease composition.

[0036] In another preferred embodiment of the present invention, the ionic liquid has a cation selected from the group consisting of symmetric and asymmetric ammonium ions, NR1R2R3R4+ and phosphonium ions PR1R2R3R4+. The residues R1 to R4 are, independently of one another, branched or unbranched, substituted or unsubstituted C1- to C 24 -, preferably C1- to C 18 -, particularly preferably C6- to C 18 -alkyl groups or C6- to C 30 -aryl groups. Preferred substituents are alkoxy, carboxy, amide, amino, thiocarboxy, carbamoyl, oxo, thioxo and / or hydroxy.

[0037] Advantageously, the residues R1 to R4 are selected such that they have in total at least 10 carbon atoms, advantageously at least 20 carbon atoms, even more preferably at least 25 carbon atoms.

[0038] In a particularly preferred embodiment of the present invention, the ionic liquid contains 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 highly preferred.

[0039] The lubricating grease composition according to the present invention can also have a mixture of different ionic liquids, where the anions are bis(fluorosulfonyl)imide in each case but the cations are different. The lubricating grease composition according to the present invention can also further have another ionic liquid where the anion is not bis(fluorosulfonyl)imide. In this case, the proportion of the other ionic liquid is advantageously 0.5% to 5% by weight based on the total weight of the lubricating grease composition.

[0040] However, in a preferred embodiment of the present invention, the lubricating grease composition does not have an ionic liquid in which the anion is not bis(fluorosulfonyl)imide. This is advantageous because using a plurality of ionic liquids complicates the manufacturing process and increases the manufacturing cost associated therewith. More preferably, the lubricating grease composition does not contain an ionic liquid containing bis(trifluoromethylsulfonyl)imide (bta) as an anion. This is advantageous for toxicological reasons. In another embodiment of the present invention, the lubricating grease composition either does not have an ionic liquid in which the anion is not bis(fluorosulfonyl)imide or has this at a maximum ratio of 0.5% by weight based on the total weight of the lubricating grease composition. More preferably, the lubricating grease composition either does not contain an ionic liquid containing a perfluoroalkyl group or contains an ionic liquid containing a perfluoroalkyl group at a maximum ratio of 0.5% by weight based on the total weight of the lubricating grease composition. This is advantageous for toxicological reasons.

[0041] In a particularly preferred embodiment of the present invention, the ionic liquid in which the anion is bis(fluorosulfonyl)imide is P666(14)fsi, trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide

Chemical formula

Chemical formula

Chemical formula

Chemical formula

[0042] The use of an ionic liquid in a lubricant composition formed as a lubricating grease composition is particularly advantageous. This is because lubricating greases are usually present in smaller amounts at the lubrication point than lubricating oils, so the positive effect on lifespan due to the ionic liquid fsi is particularly pronounced in lubricating greases.

[0043] Preferably, the lubricating grease composition contains a thickener in each case in a proportion of 4 to 30% by weight, in particular 6 to 20% by weight, based on the total weight of the lubricating grease composition.

[0044] Preferably, the cone penetration (in 1 / 10 mm units) of the lubricating grease composition formed as a lubricating grease is 400 to 200, even more preferably 330 to 220, even more preferably 300 to 250. The cone penetration is determined in accordance with DIN ISO 2137, December 2016 edition.

[0045] According to the present invention, the thickener is selected from urea, lithium simple soaps, metal-complex soaps of elements of main groups 1 and 2 of the periodic table, in particular lithium complex soaps and mixtures thereof. Urea means the reaction product of organic monofunctional, bifunctional, trifunctional and higher functional isocyanates and / or mixtures thereof with aliphatic and / or aromatic monofunctional, bifunctional, trifunctional or higher functional organic amines.

[0046] The advantage of urea is that it can be used at high application temperatures, and as a result, the combination with an ionic liquid containing FSI as an anion leads to a lubricating grease having an especially long service life. Preferred ureas are diisocyanates, preferably 2,4 - diisocyanatotoluene, 2,6 - diisocyanatotoluene, 4,4’ - diisocyanatodiphenylmethane, 2,4’ - diisocyanatodiphenylmethane, 4,4’ - diisocyanatodiphenyl, 4,4’ - diisocyanato - 3,3’ - dimethyldiphenyl, 4,4’ - diisocyanato - 3,3’ - dimethylphenylmethane (which can be used individually or in combination), and an amine or diamine of the general formula (H2N) x R [where x = 1 or 2 and R is an aryl residue, an alkyl residue, a cycloalkyl residue or an alkylene residue having 2 to 22 carbon atoms, which are present individually or in combination], and is a reaction product thereof.

[0047] In a particularly preferred embodiment, the urea is a diurea containing aliphatic, cycloaliphatic / aliphatic and / or cycloaliphatic ureas.

[0048] In a particularly preferred embodiment, the urea is of formula A

Chemical formula

[0049] The diurea compounds preferably usable according to the present invention are described in German Patent Application Publication No. 112012001102.

[0050] Preferred diurea compounds are Formula A:

Chemical formula

Chem.

Chem.

Chem.

Chem.

Chem.

[0051] In the ureas of Formulas A - E, the alkyl groups are unbranched.

[0052] In another embodiment, the thickener is selected from lithium simple soaps, metal - composite soaps of elements of Group 1 and Group 2 of the periodic table, especially lithium composite soaps and mixtures thereof.

[0053] Preferably, the lithium complex soap is derived from C4-C36 dicarboxylic acids, preferably azelaic acid, sebacic acid, suberic acid, terephthalic acid, dodecanedioic acid, and / or higher functionality higher carboxylic acids having 3 or more, preferably 3-4 carboxylic acid groups (the number of carbon groups can be 6-60), for example, preferably starting from citric acid and trimeric acid, and / or one or more of the aforementioned acids, in each case in combination with one or more monocarboxylic acids, preferably one or more C4-C24 monocarboxylic acids, preferably stearic acid, hydroxystearic acid, especially 12-hydroxystearic acid, palmitic acid, oleic acid, an ester compound combined with salicylic acid, especially a methyl ester and / or a triglyceride, an ester compound of one or more of the aforementioned acids, especially a methyl ester and / or a triglyceride and / or a lithium complex soap produced starting from a combination with sebacic acid monostearylamide and / or terephthalic acid monostearylamide.

[0054] In another embodiment, the lubricating grease composition comprises 20-92.5% by weight of a base oil based on the total weight of the lubricating grease composition and 4-20% by weight, preferably an aluminum complex soap, bentonite, sulfonate, silicate, polyimide, and a further thickener selected from mixtures thereof, based on the total weight of the lubricating grease composition.

[0055] 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 sulfides, phosphates, preferably calcium phosphate, carbonates, preferably calcium carbonate, metal oxides, preferably amorphous silicon dioxide, silicates and layered silicates, talc, mica, and mixtures thereof.

[0056] 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 sulfides, phosphates, preferably calcium phosphate, carbonates, preferably calcium carbonate, metal oxides, preferably amorphous silicon dioxide, silicates and layered silicates, talc, mica and mixtures thereof.

[0057] When present, the proportion of the solid lubricant in the lubricating grease composition according to the invention is, in each case, preferably 0.5% to 23% by weight, more preferably 0.5% to 20% by weight, particularly 0.5% to 18% by weight, based on the total weight of the lubricating grease composition.

[0058] Furthermore, the lubricating grease composition can contain, for example, additives for protecting against corrosion, oxidation (antioxidants), and the influence of metals, such as chelating compounds, free radical scavengers, UV stabilizers, reaction layer formers, viscosity improvers, pour point depressants, adhesion improvers, and / or additives for reducing oil separation in the grease.

[0059] Advantageously, the proportion of the additive in the lubricating grease composition according to the present invention is 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, particularly 1.5% by weight to 12% by weight, based on the total weight of the lubricating grease composition. Preferably, additives in the form of phosphorus-containing, sulfur-containing, nitrogen-containing and / or oxygen-containing compounds, polymers and / or mixtures thereof are used. Particularly preferred additives are aromatic amines, phenols, particularly alkylated phenols, triazoles such as benzotriazole, tolyltriazole, esters, particularly sulfurized fatty acid esters, glycerin mono- or diesters, sorbitan esters, thiadiazoles, dithiocarbamates, particularly molybdenum dithiocarbamate, phosphates, particularly thiophosphates, oligomer phosphates, oligomer thiophosphates, dithiophosphates, zinc dialkyldithiophosphate, molybdenum dithiophosphate, amine phosphates, trialkyl phosphates, triaryl phosphates, phosphites, metal salts, carboxylic acids, polymers, particularly polymethacrylates, olefin copolymers and / or mixtures thereof.

[0060] Highly preferred additives are aromatic amines, alkylated phenols, thiadiazoles, dithiocarbamates, triaryl phosphates, amine phosphates, benzotriazole and / or mixtures thereof.

[0061] Highly preferred additives are aromatic amines. This is because it has surprisingly been found that their use can significantly delay, in particular, the onset of oxidation by ionic liquids.

[0062] Preferred aromatic amines according to the present invention are styrenated diphenylamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine, octylated and / or butylated diphenylamine, particularly p,p'-dioctyldiphenylamine, nonylated diphenylamine. Thus, in a particularly preferred embodiment of the present invention, the lubricating grease composition has diphenylamine, particularly p,p'-dioctyldiphenylamine, as an antioxidant.

[0063] In another preferred embodiment of the present invention, the lubricating grease composition contains an additive in a proportion of 0.5% to 23% by weight, more preferably 0.5% to 20% by weight, particularly 0.5% to 10% by weight, based on the total weight of the lubricating grease composition.

[0064] Advantageously, the lubricating grease composition has a lower service temperature determined in accordance with IP 186, 2015 edition, of -30°C or lower, for example -60°C to -30°C, preferably -40°C or lower, for example -60°C to -40°C, and / or preferably an upper service temperature determined in accordance with DIN 51821 1+2, July 2016 edition, of at least +160°C, for example 160°C to 220°C, preferably at least +180°C, for example 180°C to 220°C.

[0065] A further subject of the present invention includes the use of the lubricating grease composition according to the present invention for lubricating drive elements, advantageously rolling bearings, transmission mechanisms, sliding bearings, actuators and / or chains.

[0066] Preferred are drive elements to which a potential is applied, advantageously rolling bearings, transmission mechanisms, sliding bearings, actuators and / or chains.

[0067] Even more preferred drive elements are rolling bearings, transmission mechanisms, sliding bearings, actuators and / or chains, which are arranged in systems and machines for the production and conveyance of food, wind turbines, vehicles, advantageously motor vehicles, particularly hybrid vehicles and electric vehicles, railway vehicles, industrial plants, industrial robots and / or ships.

[0068] Particularly preferably, the drive element is selected from pulley bearings, fan bearings, vacuum pump bearings, particularly the rolling bearings of the electric motors of hybrid vehicles and electric vehicles, particularly the generators of electric vehicles and railway vehicles, wind turbines, industrial motors, auxiliary units of vehicles and / or joints of vehicles.

[0069] Particularly preferably, the lubricating grease composition is used for lubricating the rolling bearings of electric motors in hybrid vehicles and / or electric vehicles.

[0070] This advantage lies in the fact that the lubricating grease composition according to the invention exhibits a combination of properties that are particularly suitable for these applications. Particularly advantageous is the very good thermal stability combined with the ability to discharge electric potential.

[0071] A further subject of the invention is the use of a lubricating grease composition for lubricating drive elements, preferably rolling bearings, which require a lower use temperature of -30 °C or less, for example -60 °C to -30 °C, preferably -40 °C or less, for example -60 °C to -30 °C, determined according to IP 186, 2015 edition, and / or a higher use temperature of at least +160 °C, for example 160 °C to 220 °C, more preferably at least +180 °C, for example 180 °C to 220 °C, determined according to DIN 51821 1+2, July 2016 edition.

Brief Description of the Drawings

[0072]

Figure 1

Figure 2

[0073] Hereinafter, the present invention will be described in more detail with reference to some examples that do not limit the present invention.

[0074] Example 1 TGA measurements of the ionic liquids trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide (P666(14)fsi) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide (P666(14)bta) were carried out and the values obtained were compared with each other.

[0075]

Table 1

[0076] As expected, the TGA measurement showed that P666(14)bta had better thermal stability than P666(14)fsi. The evaporation loss value was lower for P666(14)bta when measured in both air and N2. The better thermal stability of bta can be explained by the strong carbon-fluorine bond within the anion.

[0077] Example 2 DSC measurements were carried out on the ionic liquids trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide (P666(14)fsi) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide (P666(14)bta).

[0078] Figure 1 shows the results of the DSC measurement under an O2 atmosphere, and Figure 2 shows the results of the DSC measurement under an N2 atmosphere.

[0079] From Figure 1, it can be seen that the onset of P666(14)fsi is earlier than that of P666(14)bta, and thus its stability is lower.

[0080] Figure 2 shows that P666(14)fsi has a significant exothermic reaction near 270 °C, while P666(14)bta does not. In both investigations, it was confirmed that the ionic liquid with the fsi anion in the pure substance has low thermal resistance.

[0081] Example 3 To determine the evaporation loss, trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide (P666(14)fsi) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide (P666(14)bta) were placed in a cylindrical threaded vial (bottom area 1.5 cm 2, fill to a height of 5 cm. Weigh exactly 200 mg of each of the two ILs. At two test temperatures, use vials without spheres (100Cr6 steel balls according to DIN 51350-1, March 2015 edition) and vials with spheres respectively. This purpose is to test whether a reaction occurs between the metal of the spheres and the ionic liquid in the vial.

[0082]

Table 2

[0083]

Table 3

[0084] At a test temperature of 150 °C, there is a difference in the evaporation loss of both ionic liquids in the pure substances. In the sample without spheres, the evaporation loss of P666(14)bta continuously increases over the measurement period. In comparison, an overall weight increase is observed in the values of the fsi sample. In the presence of steel balls, it can be seen that the evaporation loss of P666(14)fsi is lower than that of P666(14)bta. With spheres, the overall evaporation loss values for both substances are significantly higher. However, in the case of P666(14)fsi, the value first increases and then decreases again towards the end.

[0085] At 180 °C, the evaporation losses of both substances are naturally higher than those at 150 °C. In contrast to the low test temperature, the trend of the values of P666(14)fsi is not prominent. Nevertheless, towards the end of the period, they become higher than those of P666(14)bta. Generally, it can be understood that the observed values are involved in phenomena such as water absorption / desorption, corrosion of steel balls, and catalytic decomposition in addition to decomposition with mass loss. At 180 °C, from the tests of the substances in pure form, it is suggested that the stability of the IL containing fsi is lower than that of the IL containing bta.

[0086] Example 4 Manufacture of Two Lubricating Grease Compositions and Comparative Grease According to the Invention from Base Grease A Base grease A It consists of 85% by weight of trimellitic acid ester (TMSE-A) containing C9 - C11 alcohol with an oxygen / carbon ratio of 0.20 and a base oil viscosity at 40°C of about 72 mm 2 / s, aliphatic saturated amines, aliphatic unsaturated amines and aromatic amines, and 11% by weight of a urea thickener composed of the reaction product of a mixture from MDI (4,4'-diisocyanatodiphenylmethane) and TDI (a mixture of 2,4 - diisocyanatotoluene and 2,6 - diisocyanatotoluene in a molar ratio of about 4:1). As additives, 0.5% by weight of p,p'-dioctyldiphenylamine and 3.5% by weight of another additive (corrosion prevention, antiwear) are used.

[0087] To this base grease A, 5% by weight of P666(14)fsi( Grease 1 according to the present invention ) or 5% by weight of P666(14)bta( Comparative grease 2 ) is added, and the mixture is homogenized through a three-roll mill. Grease 3 according to the present invention In the case of, 5% by weight of N1888 fsi is used and incorporated in the same way.

[0088] Compared with base grease A, the specific electrical resistance drops by about a factor of 10³. Surprisingly, grease 1 according to the invention shows a lifespan improved by about 50% at 180°C compared to comparative grease 2 containing an ionic liquid not according to the invention. Also, the grease according to the invention meets the lifespan requirements of DIN 51821 1+2 at 200°C.

[0089]

Table 4 - 1

Table 4 - 2

[0090]

Table 5

[0091] In the life test at 200 °C, Grease 1 according to the present invention shows a remarkable increase in the achieved life of more than 2.5 times based on the L50 value. Similarly, Grease 3 according to the present invention shows a 50% increase in life compared to Base Grease A.

[0092] Example 5 Some lubricating grease compositions according to the present invention and comparative greases are produced from Base Grease B.

[0093] Base grease B is 84.5 wt% of trimellitic acid ester having linear C8 and C10 alkyl groups present in a ratio of 1:1 (mol) (having an oxygen / carbon ratio of 0.22) (TMSE-B), 13.5 wt% of a urea thickener produced by reacting MDI (4,4'-diisocyanatodiphenylmethane) and octylamine in a ratio of 1.2 (mol), 1 wt% of p,p'-dioctyldiphenylamine, 1 wt% of a calcium sulfonate corrosion inhibitor additive consisting of.

[0094]

Table 6

[0095] Grease 6 according to the present invention shows an increase in life of about 50% compared to Base Grease B (comparative grease) while maintaining a very steep failure curve (high β value). Grease 7 according to the present invention shows an increase in life of about 40%.

[0096] All greases according to the present invention satisfy the requirements of DIN 51821 1+2 at 200 °C because the L50 value exceeds 100 hours. This makes it possible to lower the electrical resistance (see the table below) while maintaining the upper use temperature of 200 °C.

[0097]

Table 7

[0098] The addition of IL P666(14)fsi significantly reduces the specific electrical resistance. On the other hand, the cone penetration only changes slightly, indicating that the thickening effect is not hindered by the ionic liquid.

[0099] Example 6 The specific electrical resistance of a mixture of P666(14)fsi or P666(14)bta in polyglycol was measured.

[0100] As polyglycol A, polyglycol with a kinematic viscosity of 220 mm 2 / s is used. This is a random copolymer from ethylene oxide and propylene oxide in a 1:1 (molar) ratio using glycol as a starter. The oxygen / carbon ratio is 0.53.

[0101] [Table 8]

[0102] [Table 9]

[0103] The table shows that the lubricant composition using P666(14)fsi results in a lower specific resistance compared to P666(14)bta. From this, it can be inferred that the lubricating grease composition containing the aforementioned base oil A also has a reduced specific resistance by the addition of P666(14)fsi.

[0104] This was surprising because, as shown in the following table, the viscosity of P666(14)fsi is higher than that of P666(14)bta.

[0105] [Table 10]

[0106] This suggests that in the case of fsi, the ion pairs are actually more tightly bound, i.e., have lower mobility, and should thus exhibit lower conductivity. However, as shown above, this is surprisingly not the case.

[0107] Example 7 The effect of N1888 fsi on the thermal oxidation stability of ester oil was investigated.

[0108] Trimellitic acid ester B (trimellitic acid ester having linear C8 and C10 alkyl groups present in a ratio of about 1:1 (mol)) is used as the base oil, and p,p'-dioctyldiphenylamine is used as the amine-based antioxidant (amine AO). Trimellitic acid ester B is base oil A.

[0109] [Table 11-1] [Table 11-2]

[0110] The shear viscosity is measured at a shear rate of 300 1 / s at 25 °C in accordance with DIN 53019-1.3. The open dish test is carried out in an aluminum evaporation dish with a diameter of 50 mm. 5 g ± 0.1 g is weighed. The measurement is carried out in a circulating air oven. The measurement is carried out over 24 / 48 / 72 hours. In each case, the evaporation loss is determined and the shear viscosity is measured.

[0111] Oils 2, 3, 4, 5 and 6 are lubricant compositions from which lubricating grease compositions according to the invention can be obtained by combination with a thickener.

[0112] Comparing the samples containing only P666(14) fsi (oils 6 and 5) with the samples containing only amine AO (oils 1 and 7), it can be seen that the onset of oxidation is significantly delayed by the ionic liquid.

[0113] The sample combining the amine antioxidant p,p'-dioctyldiphenylamine with P666(14)fsi also shows a significant positive effect on the evaporation loss in TGA up to 300 °C, the onset and onset of oxidation in DSC, and the evaporation value in the open dish test (see, for example, the evaporation value after 24 hours).

[0114] Example 8 Perform a solubility test of N1888 fsi in base oils containing base oils with different polarities. The results are shown in the following table.

[0115] [Table 12]

[0116] The base oil mixture described here is not suitable for the production of the lubricating grease composition according to the present invention because the proportion of base oil A is too low and thus the solubility of N1888 fsi is too low.

[0117] [Table 13]

[0118] The base oil mixture described here is suitable for the production of the lubricating grease composition according to the present invention because base oil A is present in a sufficient proportion and thus the solubility of N1888 fsi is sufficient.

[0119] [Table 14]

[0120] The base oil mixture described here is suitable for the production of the lubricating grease composition according to the present invention because base oil A is present in a sufficient proportion and thus the solubility of N1888 fsi is sufficient.

[0121] [Table 15]

[0122]

Table 16

[0123] The base oil described herein is suitable for the production of the lubricating grease composition according to the present invention because base oil A is present in a sufficient proportion, and thus the solubility of N1888 fsi is very good.

[0124] These examples show that the ionic liquid N1888 fsi is miscible with the trimellitic acid ester over a very wide concentration range.

[0125]

Table 17

[0126] The base oil described herein is not suitable for the production of the lubricating grease composition according to the present invention because the proportion of base oil A does not exist, and thus the solubility of N1888 fsi is insufficient.

[0127]

Table 18

[0128] The base oil mixture described herein is suitable for the production of the lubricating grease composition according to the present invention because base oil A is present in a sufficient proportion, and thus the solubility of N1888 fsi is sufficient.

[0129]

Table 19

[0130] The base oil described here does not have a proportion of base oil A, and thus the solubility of N1888 fsi is insufficient, so it is not suitable for the production of the lubricating grease composition according to the present invention.

[0131]

Table 20

[0132] The base oil described here has only base oil A, and thus the solubility of N1888 fsi is sufficient, so it is suitable for the production of the lubricating grease composition according to the present invention.

[0133] It can be seen that N1888 fsi can be easily dissolved even in a larger amount in a base oil having a proportion of polar base oil exceeding 50% by weight. The polar base oil is selected from esters and polyalkylene glycols produced using ethylene oxide as a component of the reaction mixture.

[0134] Example 9: Starting from base grease C, grease 9 not according to the present invention is produced:

Table 21

[0135] Base grease C is assigned to NLGI class 1. The base oil has a kinematic viscosity of 130 mm 2 / s at 40 °C and is a non-polar mixture from mineral oil / PAO. The oxygen / carbon ratio is approximately 0. The thickener is a mixture from urea / calcium complex soap. Furthermore, normal additives for improving oxidation stability, load-carrying capacity and protection from corrosion are also included. Adding an ionic liquid does not improve the life, and the L50 value further decreases. It can be seen that no improvement is achieved by using an ionic liquid in a grease with a non-polar base oil (mineral oil and PAO).

[0136] Example 10 Lubricating grease D is produced with the following composition: 41 wt% of trimellitic acid ester A, C9 - C11 V 40 about 72 mm 2 / s (oxygen / carbon ratio of 0.20) 17 wt% of PIB, Mn of about 1300 g / mol determined by GPC (oxygen / carbon ratio of 0.0) 20 wt% of alkylated diphenyl ether, V 40 about 100 mm 2 / s (oxygen / carbon ratio of 0.04) 13 wt% of lithium complex thickener from azelaic acid / 12 - hydroxystearic acid 4 wt% of amine - based antioxidant 5 wt% of additive package for corrosion prevention, AW and EP.

[0137] The weight ratio of trimellitic acid ester A in the total base oil is 52.6 wt%.

[0138]

Table 22 - 1

Table 22 - 2

[0139] The composition according to the present invention shows advantages regarding reduction of specific resistance, low - temperature behavior (flow pressure), and avoidance of hardening (without increase in kinematic viscosity) when stored at 180 °C.

[0140] Example 11: Solubility investigation of N8881 fsi in an esteride - based oil

Table 23

[0141] N8881 fsi is soluble in the esteride - based oil in the investigated concentration range. The specific resistance decreases as the amount of IL increases.

[0142] Evaluation of test results Generally, it has been demonstrated that lubricating grease compositions containing fsi-based ionic liquids as anions can achieve performance values within the range of products with bta-based ionic liquids added. Therefore, fsi-based ionic liquids are excellent alternatives to ionic liquids containing bta. Furthermore, fsi-based additives have the advantage of not containing hardly decomposable CFx groups compared to additives containing bta.

[0143] In an experiment where P666(14)fsi was examined in pure form, as expected, it was shown to have lower thermal stability compared to P666(14)bta. This can mainly be explained by the lack of strong carbon-fluorine bonds within the anion, which affects the stability of the whole molecule.

[0144] Surprisingly, the performance difference between the two ionic liquids becomes significantly lower when they are used as additives in grease. The values of the tested properties indicate that P666(14)fsi exhibits very similar performance to P666(14)bta in the observed grease systems. High-temperature and / or low-temperature properties as well as conductivity criteria can be met by using fsi materials as additives within the observed temperature range.

[0145] Furthermore, the lubricating grease composition according to the present invention can also meet the criteria regarding corrosion stability.

[0146] Generally, it has been shown that lubricating grease compositions having fsi-based ionic liquids are excellent alternatives to lubricating grease compositions having bta-containing ionic liquids from the perspective of their performance. Furthermore, the lubricating grease composition according to the present invention does not have hardly decomposable CFx groups and is therefore biodegradable.

[0147] Test Method

[0148] To determine the kinematic viscosity at 40 °C and 100 °C, the viscosity index and the density at 40 °C and 100 °C, a Stabinger viscometer compliant with ASTM D 7042 January 2021 edition is used, unless otherwise specified.

[0149] Determination of carbon content: ASTM D 5291:2021 is used for the determination of carbon content.

[0150] JPI-5S-68-11 is used for the determination of oxygen content.

[0151] The oxygen / carbon weight ratio is obtained by dividing the oxygen mass fraction (wt%) determined according to JPI-5S-68-11 by the carbon mass fraction (wt%) determined according to ASTM D 5291:2021.

[0152] To determine the solubility of ionic liquid N1888 fsi in the base oil or base oils forming the base oil, one or more base oils forming the base oil are placed in a beaker and N1888 fsi is added at each concentration. The mixture is stirred at 60 °C for 10 minutes using a magnetic stirrer. After cooling to room temperature, the mixture is visually inspected and the electrical resistance is measured. N1888 fsi is insoluble in the base oil or base oils at a specific concentration when the turbidity value is more than 1 FNU higher than the turbidity of the pure base oil or base oils during turbidity measurement at 25 °C according to DIN EN ISO 7027-1:2016-11. N1888 fsi is similarly insoluble in the base oil or base oils at a specific concentration when two or more phases are formed. N1888 fsi is insoluble in the base oil or base oils at a specific concentration when the turbidity value is more than 1 FNU higher than the turbidity of the pure base oil or base oils during turbidity measurement at 25 °C according to DIN EN ISO 7027-1:2016-11.

Claims

1. A lubricating grease composition comprising: a) a base oil in an amount of 20 to 96.5% by weight based on the total weight of the lubricating grease composition, said base oil having at least 50% by weight of base oil A based on the total weight of the base oil, said base oil A being an ester and / or a polyglycol, preferably a polyglycol containing unsubstituted ethylene units as carbon groups in the repeating units, and b) an ionic liquid in an amount of 0.5 to 80% by weight based on the total weight of the lubricating grease composition, wherein the anion is bis(fluorosulfonyl)imide, and c) a thickener selected from urea, lithium simple soap, metal-complex soaps of elements of Group 1 and Group 2 of the periodic table, especially lithium complex soaps and mixtures thereof, in an amount of 3 to 35% by weight based on the total weight of the lubricating grease composition. A lubricating grease composition.

2. The lubricating grease composition according to claim 1, wherein the base oil has a solubility of at least 3% by weight in the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20 °C and / or the base oil A has a solubility of at least 3% by weight in the ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20 °C.

3. The lubricating grease composition according to claim 1 or 2, wherein the base oil A is present in each case in a proportion of 50 to 100% by weight and / or more than 55% by weight, for example 55 to 100% by weight, and / or more than 60% by weight, for example 60 to 100% by weight, more preferably more than 70% by weight, for example 70 to 100% by weight, based on the total weight of the base oil.

4. The lubricating grease composition according to any one of claims 1 to 3, wherein the proportion of the base oil based on the total weight of the lubricating grease composition is 40% to 95% by weight, more preferably 60% to 90% by weight, even more preferably 70% to 95% by weight, especially 75% to 85% by weight.

5. The proportion of the base oil A based on the total weight of the lubricating grease composition is 10% by weight to 96.5% by weight, more preferably 35% by weight to 95% by weight, even more preferably 40% by weight to 90% by weight, particularly 35% by weight to 85% by weight, and the lubricating grease composition according to any one of claims 1 to 4 is characterized thereby.

6. The lubricating grease composition according to any one of claims 1 to 5 is characterized in that the ester has an oxygen / carbon weight ratio of more than 0.1, for example 0.2 to 0.35, and / or the polyglycol has an oxygen / carbon weight ratio of more than 0.44, for example 0.44 to 0.

70.

7. The polyglycol is selected from homopolymers from ethylene oxide as the only monomer and / or copolymers having unsubstituted ethyl groups and 1-methylethyl groups as carbon groups in the repeating units, and the weight ratio of the unsubstituted ethylene units in the copolymer is advantageously at least 20% by weight, for example 20% by weight to 90% by weight, advantageously at least 30% by weight, for example 30% by weight to 90% by weight, based on the total weight of the polyglycol, and the end groups of the polyglycol are, independently of one another, preferably hydroxide groups and / or C1-C20 alkoxide groups, and the lubricating grease composition according to any one of claims 1 to 6 is characterized thereby.

8. The lubricating grease composition according to any one of claims 1 to 7 is characterized in that the ester is selected from carboxylic acid esters, preferably mono esters, di esters, tri esters, tetra esters, penta esters, polyesters, preferably estrides and mixtures thereof.

9. The lubricating grease composition according to any one of claims 1 to 8, wherein the ester is selected from the group consisting of aliphatic monocarboxylic acids having 5 to 22 carbon atoms and aliphatic triesters, tetraesters, hexaalcohols having 3 to 10 carbon atoms, present individually or as a mixture, in particular trimethylolpropane, pentaerythritol and / or dipentaerythritol, and / or aliphatic dicarboxylic acids having 6 to 20 carbon atoms and aliphatic mono- and / or dialcohols having 6 to 22 carbon atoms, present individually or as a mixture, aliphatic esters, estolides and aromatic triesters and tetraacids and aromatic esters of aliphatic C7 to C22 alcohols, present individually or as a mixture, and mixtures thereof.

10. The lubricating grease composition according to any one of claims 1 to 9, wherein the base oil contains the base oil A in a mixture with the base oil B, and the base oil B has a solubility of less than 3% by weight in ionic liquid methyltrioctylammonium-bis(fluorosulfonyl)imide at room temperature of 20°C.

11. The lubricating grease composition according to claim 10, wherein the base oil B is a base oil B1 having an oxygen / carbon weight ratio of at most 0.1, preferably 0 to 0.1, and / or the base oil B is a base oil B2 having a proportion of halogen and / or silicon of more than 5% by weight based on the total weight of the base oil B2.

12. The base oil B is selected from the group consisting of base oils of Groups I, II, II+, III, and IV according to the classification of the American Petroleum Institute (API) [NLGI Spokesman, N. Samman, Volume 70, Number 11, p.14ff], and subsequent base oils of Group V, namely diphenyl ether, alkylated naphthalene, polyisobutylene, silicone oil, polytetrahydrofuran, and oxetane polymer, a polyalkylene glycol having ethylene units substituted with aliphatic and / or aromatic alkyl groups, wherein the weight ratio of unsubstituted ethylene units in the polyalkylene glycol is less than 20% by weight based on the total weight of the polyalkylene glycol, aliphatic esters of aliphatic dicarboxylic acids having 22 to 40 carbon atoms, preferably 34 to 38 carbon atoms, and aliphatic mono- and / or di-alcohols having 6 to 22 carbon atoms, present individually or as a mixture, aliphatic esters of aliphatic tricarboxylic acids having 33 to 60 carbon atoms, preferably 50 to 58 carbon atoms, and aliphatic mono- and / or di-alcohols having 6 to 22 carbon atoms, present individually or as a mixture, and mixtures thereof, the lubricating grease composition according to claim 10 or 11, characterized in that it is selected therefrom.

13. The proportion of the base oil B is, in each case, 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, particularly at most 30% by weight, for example 10 to 30% by weight, based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is at least 50:50, particularly preferably at least 60:40, more preferably at least 70:30, particularly at least 80:20, the lubricating grease composition according to any one of claims 10 to 12, characterized in that it is such.

14. The weight ratio of base oil A to base oil B is 50:50 to 60:40, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide is 0.5 to 10% by weight based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 60:40 to 70:30, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide is 0.5% to 15% by weight based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 70:30 to 90:10, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide is 0.5% to 40% by weight based on the total weight of the lubricating grease composition, and / or the weight ratio of base oil A to base oil B is 80:20 to 90:10, and the proportion of the ionic liquid in which the anion is bis(fluorosulfonyl)imide is 0.5% to 80% by weight based on the total weight of the lubricating grease composition. The lubricating grease composition according to any one of claims 10 to 13.

15. 20 mm at 40 °C ２ / s to 1500 mm ２ / s, preferably 20 mm ２ / s to 320 mm ２ The lubricating grease composition according to any one of claims 1 to 14, characterized by having a kinematic viscosity of

16. The ionic liquid has a cation selected from the group consisting of symmetric and asymmetric ammonium ions, NR １ R ２ R ３ R ４ +, and phosphonium ions PR １ R ２ R ３ R ４ +, and the residues R １ to R ４ are, independently of one another, 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, and the lubricating grease composition according to any one of claims 1 to 15 is characterized in that it can be such.

17. The lubricating grease composition according to any one of claims 1 to 16, characterized in that it does not have an ionic liquid in which the anion is not bis(fluorosulfonyl)imide, or has an ionic liquid in which the anion is not bis(fluorosulfonyl)imide at a ratio of at most 0.5% by weight based on the total weight of the lubricating grease composition.

18. The lubricating grease composition according to any one of claims 1 to 17, characterized in that it does not have an ionic liquid containing a perfluoroalkyl group, or has an ionic liquid containing a perfluoroalkyl group at a ratio of at most 0.5% by weight based on the total weight of the lubricating grease composition.

19. The ionic liquid in which the anion is bis(fluorosulfonyl)imide is trihexyl(tetradecyl)phosphonium bis(fluorosulfonyl)imide 【Chemical 1】 methyltrioctylammonium - bis(fluorosulfonyl)imide 【Chemical 2】 tributyltetradecylphosphonium - bis(fluorosulfonyl)imide 【Chemical Formula 3】 tetraoctylphosphonium - bis(fluorosulfonyl)imide 【Chemical 4】 The lubricating grease composition according to any one of claims 1 to 18, characterized in that it is selected from the group consisting of and mixtures thereof.

20. The lubricating grease composition according to any one of claims 1 to 19, characterized in that the proportion of the thickener is 4 to 30% by weight based on the total weight of the lubricating grease composition.

21. The lubricating grease composition according to any one of claims 1 to 20, characterized in that the lubricating grease composition comprises 20 to 92.5% by weight of a base oil based on the total weight of the lubricating grease composition and 4 to 20% by weight, preferably selected from the group consisting of aluminum complex soap, bentonite, sulfonate, silicate, polyimide and mixtures thereof, of a further thickener based on the total weight of the lubricating grease composition.

22. The urea is a reaction product of a diisocyanate, preferably 2,4 - diisocyanatotoluene, 2,6 - diisocyanatotoluene, 4,4'-diisocyanatodiphenylmethane, 2,4'-diisocyanatodiphenylmethane, 4,4'-diisocyanatodiphenyl, 4,4'-diisocyanato - 3,3'-dimethyldiphenyl, 4,4'-diisocyanato - 3,3'-dimethylphenylmethane (which can be used individually or in combination), and an amine or diamine of the general formula (H ２ N) ｘ R [wherein x = 1 or 2, and R is an aryl residue, an alkyl residue, a cycloalkyl residue or an alkylene residue having 2 to 22 carbon atoms, which exist individually or in combination], and is a urea, characterized in that the lubricating grease composition according to any one of claims 1 to 21

23. The urea contains a diurea containing an aliphatic, cycloaliphatic / aliphatic and / or cycloaliphatic urea, preferably Formula A 【Chemical Formula 5】 which is a diurea represented by In the formula, R ２ is a divalent aromatic hydrocarbon residue having 6 to 15 carbon atoms, and R １ and R ３ are each independently a C6-20 cycloalkyl residue, particularly a cyclohexyl residue or a linear or branched C8-20 alkyl residue, the lubricating grease composition according to any one of claims 1 to 22.

24. The lithium complex soap is based on a C4-C36 dicarboxylic acid, preferably azelaic acid, sebacic acid, cork acid, terephthalic acid, dodecanedioic acid, and / or a higher functionality higher carboxylic acid having 3 or more, preferably 3 to 4 carboxylic acid groups (the number of carbon groups can be 6 to 60), for example, preferably starting from citric acid and trimeric acid, and / or one or more of the aforementioned acids, in each case in combination with one or more monocarboxylic acids, preferably one or more C4-C24 monocarboxylic acids, preferably stearic acid, hydroxystearic acid, especially 12-hydroxystearic acid, palmitic acid, oleic acid, salicylic acid, in particular an ester compound combined with methyl ester and / or triglyceride, an ester compound of one or more of the aforementioned acids, in particular a methyl ester and / or triglyceride and / or a lithium complex soap produced starting from a combination with sebacic acid monostearylamide and / or terephthalic acid monostearylamide, characterized in that it is the lubricating grease composition according to any one of claims 1 to 23.

25. As an additive, an aromatic amine, preferably a styrenated diphenylamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine, octylated and / or butylated diphenylamine, in particular p,p'-dioctyldiphenylamine, nonylated diphenylamine, is selected. The aromatic amine is preferably contained in a proportion of 0.5% by weight to 23% by weight, more preferably 0.5% by weight to 20% by weight, and particularly 0.5% by weight to 10% by weight based on the total weight of the lubricating grease composition. The lubricating grease composition according to any one of claims 1 to 24 is characterized in that it contains the aromatic amine in such a proportion.

26. According to IP 186, 2015 edition, having a lower limit operating temperature of -30°C or lower, preferably -40°C or lower, and / or according to DIN 51821 1+2, July 2016 edition, having an upper limit operating temperature of at least +160°C, preferably at least +180°C. The lubricating grease composition according to any one of claims 1 to 25 is characterized in that it has such temperature limits.

27. Use of the lubricating grease composition according to any one of claims 1 to 26 for lubricating a drive element to which a potential is preferably applied, preferably a rolling bearing, a transmission mechanism, a sliding bearing, an actuator and / or a chain.

28. The use according to claim 27, characterized in that the drive element is selected from a pulley bearing, a fan bearing, a vacuum pump bearing, in particular a rolling bearing of an electric motor of a hybrid vehicle and an electric vehicle, in particular a generator of an electric vehicle and a railway vehicle, a wind turbine, an industrial motor, an auxiliary unit of a vehicle and / or a joint of a vehicle.

29. The use according to claim 27 or 28, characterized in that the lubricating grease composition is used for lubricating a drive element, preferably a rolling bearing, which requires a lower limit operating temperature of the lubricating grease of -30°C or lower, preferably -40°C or lower, according to IP 186, 2015 edition, and / or an upper limit operating temperature of at least +160°C, preferably at least +180°C, determined preferably according to DIN 51821 1+2, July 2016 edition.

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