USE OF A LUBRICATING GREASE COMPOSITION HAVING A HIGH UPPER USE TEMPERATURE

Abstract

A lubricant grease composition is disclosed, the lubricant grease composition including a base oil and a thickener. The thickener includes an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components in which an upper use temperature of the lubricant grease composition is at least 90° C.

Claims

1. A lubricant grease composition comprising: a base oil; and a thickener comprising an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components in which an upper use temperature of the lubricant grease composition is at least 90° C..

2. A lubricant grease composition comprising: a base oil; and a thickener comprising an aluminum-based complex soap and a polyurea thickener, wherein the lubricant grease is configured for lubrication of surfaces of components at a temperature that is at least intermittently at least 90° C..

3. The lubricant grease claimed in claim 1, wherein the lubricant grease composition has a use temperature range of −60° C..

4. The lubricant grease claimed in claim 1, wherein a proportion of the polyurea thickener in the lubricant grease composition is 1% by weight to 11% by weight, based on the total weight of the lubricant grease composition.

5. The lubricant grease claimed in claim 1, wherein the polyurea thickener is a reaction product of a diisocyanate selected from the group consisting of 2,4- diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′—diisocyanatodiphenylmethane, 2,4′-diisocyanatophenyl-methane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanato-3,3′-dimethyl-phenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines.

6. The lubricant grease claimed in claim 2, wherein the lubricant grease is configured for lubrication of surfaces of components when the temperature is maintained for a period of at least 10 minutes.

7. The lubricant grease claimed in claim 1, wherein the lubricant grease is configured for lubrication of surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners in actuators in the automotive sector.

8. The lubricant grease claimed in claim 1, wherein the lubricant grease composition has an oil separation according to ASTM D 6184-17 (24 h/100° C.) of less than 12% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C.) of less than 16% by weight and/or according to ASTM D 6184-17 (24 h/100° C., then 24 h/110° C., then 24 h/120° C.) of less than 20% by weight.

9. The lubricant grease claimed in claim 1, wherein the aluminum-based complex soap has the formula (A) ##STR00003## where R is an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms.

10. The lubricant grease claimed in claim 9, wherein R is derived from one or more fatty acids selected from the group consisting of lauric acid, palmitic acid, myristic acid, and stearic acid.

11. The lubricant grease claimed in claim 1, wherein the proportion of the aluminum-based complex soap in the lubricant grease composition is from 1% by weight to 11% by weight based on the total weight of the lubricant grease composition.

12. The lubricant grease claimed in claim 1, wherein the proportion of aluminum-based complex soap and polyurea thickener together is from 2% by weight to 22% by weight, based on the total weight of lubricant grease composition.

13. The lubricant grease claimed in claim 1, wherein the base oils are polyalphaolefins; or metallocene polyalphaolefins, and naphthenic mineral oils according to the API Group I classification.

14. The lubricant grease claimed in claim 1, wherein the lubricant grease composition has the following composition: 55% to 96% by weight of base oil, 1% to 11% by weight of polyurea thickener, 1% to 11% by weight of aluminum-based complex soap, 1% to 30% by weight of additives, and 1% to 30% by weight of solid lubricants.

Description

DETAILED DESCRIPTION

[0013] This object is achieved in accordance with the invention by the use of a lubricant grease composition comprising [0014] a base oil, [0015] a thickener comprising an aluminum-based complex soap and a polyurea thickener, for lubrication of the surfaces of components in applications in which an upper use temperature of the lubricant grease composition of at least 90° C., for example 90° C. to 180° C. and/or 90° C. to 160° C. and/or 90° C. to 150° C., preferably at least 100° C., for example 100° C. to 180° C. and/or 100° C. to 160° C. and/or 100° C. to 150° C., more preferably 110° C. to 180° C. and/or 110° C. to 170° C. and/or 110° C. to 160° C. and/or 110° C. to 150° C., is required.

[0016] It has been found in accordance with the invention that, surprisingly, the use of a thickener comprising an aluminum-based complex soap in combination with a polyurea thickener makes it possible to obtain a lubricant grease composition of excellent suitability for lubrication of the surfaces of components in applications in which a high upper use temperature of the lubricant grease composition is required. Thus, the lubricant grease composition is of excellent suitability for applications in the automotive sector, since the use temperatures required in the automotive sector, which are typically in the range from −40° C. to +120° C., can be achieved without difficulty. Examples of applications in which an upper use temperature of the lubricant grease composition of at least 90° C. is required is the lubrication of ball joints, spur gears, worm gears and planetary gears and actuators of brush-operated or brushless DC motors (DC, BLDC motors) and/or AC motors (AC, BLAC motors).

[0017] The lubricant grease composition used in accordance with the invention preferably has an upper use temperature of at least 90° C., for example 90° C. to 180° C. and/or 90° C. to 160° C. and/or 90° C. to 150° C., preferably at least 100° C., for example 100° C. to 180° C. and/or 100° C. to 160° C. and/or 100° C. to 150° C., more preferably 110° C. to 180° C. and/or 110° C. to 170° C. and/or 110° C. to 160° C. and/or 110° C. to 150° C.

[0018] An upper use temperature of the lubricant grease composition is understood to mean the highest temperature at which the lubricant grease composition can be used without losing its use capability. The upper use temperature can be determined in accordance with the invention by measuring oil separation at various temperatures. According to the invention, the upper use temperature of the lubricant grease composition is the highest temperature at which the lubricant grease composition has an oil separation to ASTM D6184-17 (24 h/X° C.) of less than 12% by weight. The lubricant grease composition preferably has an oil separation to ASTM D6184-17 (24 h/100° C.) of less than 12% by weight, more preferably of less than 10% by weight and especially less than 6% by weight. Likewise preferably, the lubricant grease composition has an oil separation to ASTM D6184-17 (24 h/100° C., then 24 h/110° C.) of less than 16% by weight, more preferably of less than 14% by weight and especially less than 13% by weight. Likewise preferably, the lubricant grease composition has an oil separation to ASTM D6184-17 (24 h/100° C., then 24 h/110° C., then 24 h/120° C.) of less than 20% by weight, more preferably of less than 15% by weight and especially less than 12% by weight.

[0019] In an embodiment of the invention, the lubricant grease composition has a use temperature range from −60° C. to +180° C. and/or of −50° C. to +160° C., and/or of −40° C. to +150° C. and/or of −40° C. to +140° C. and/or of −40° C. to +120° C. A use temperature range of the lubricant grease composition is understood to mean the temperature range in which the lubricant grease composition can be used without losing its use capability. For instance, according to the invention, a lubricant grease composition at its use temperature has an oil separation to ASTM D6184-17 (24 h/X° C.) of less than 12% by weight. In addition, a lubricant grease composition at its use temperature has a flow pressure (DIN 51805-2:2016-09) of not more than 1400 mbar.

[0020] Nevertheless, the lubricant grease composition can also be used at temperatures higher or lower than the abovementioned temperatures, provided that these temperatures occur only for a short period of time, for example less than 10 minutes.

[0021] The invention further provides for the use of a lubricant grease composition comprising [0022] a base oil, [0023] a thickener comprising an aluminum-based complex soap and a polyurea thickener,
for lubrication of the surfaces of components at temperatures that are at least inteiu ittently at least 90° C., for example 90° C. to 180° C. and/or 90° C. to 160° C. and/or 90° C. to 150° C., preferably at least 100° C., for example 100° C. to 180° C. and/or 100° C. to 160° C. and/or 100° C. to 150° C., more preferably 110° C. to 180° C. and/or 110° C. to 170° C. and/or 110° C. to 160° C. and/or 110° C. to 150° C.

[0024] In an embodiment of the invention, the temperature is maintained for a period of at least 10 minutes, more preferably of at least 20 minutes, more preferably of at least 40 minutes and especially of at least 60 minutes.

[0025] The high thermal stability of the lubricant grease composition was surprising in that the use of aluminum-based complex soaps, as elucidated above, is known to lead to lubricant greases having comparatively low thermal stability of generally below 90° C. Without committing to any mechanism, it is suspected that a synergism develops between aluminum complex soap and polyurea thickener that increases the thermal stability of the aluminum complex soap. This is probably because the two thickener components have good mutual miscibility, and hence the result is a hybrid thickener system. The distinctly higher upper use temperature of the polyurea thickener has a positive influence on the upper use temperature of the aluminum-based complex soap without adversely affecting the general positive properties of the aluminum-based complex soap.

[0026] A polyurea thickener is understood to mean a reaction product of a diisocyanate, preferably 2,4- diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′-dii socyanatodiphenylmethane, 2,4′-diisocyanatophenylmethane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanato-3,3′-dimethylphenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical having 2 to 22 carbon atoms, or with mixtures of amines and diamines.

[0027] The proportion of the polyurea thickener in the lubricant grease composition of the invention is preferably 1% by weight to 11% by weight, more preferably from 2% by weight to 10% by weight, and especially from 3% by weight to 9% by weight, based in each case on the total weight of the lubricant grease composition.

[0028] According to the invention, it is possible in principle to use a wide variety of different aluminum-based complex soaps that are customarily used in lubricant grease compositions. In one embodiment of the present invention, aluminum-based complex soaps of the

##STR00001##

[0029] are preferred on account of their good availability. The fatty acid radical R here is preferably an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms (R=C.sub.4-C.sub.28). Preference is given here to an even number of carbon atoms since this occurs in most naturally occurring fatty acids. More preferably, R=C.sub.12-C.sub.22. Further preferably, the R radicals are derived from fatty acids selected from the group consisting of lauric acid, palmitic acid, mytistic acid, stearic acid and mixtures thereof.

[0030] Aluminum-based complex soaps as shown in formula 1 are aluminum carboxylate compounds that can be prepared by a reaction of a fatty acid, an aromatic carboxylic acid and an aluminum-alcohol derivative. Commercially used aluminum alkoxides are aluminum isopropoxide or trioxyaluminum triisopropoxide. A simple route to preparation of the aforementioned aluminum-based complex soaps comprises the reaction between a trioxyaluminum triisopropoxide (Al trimer for short), a fatty acid and a benzoic acid:

##STR00002##

[0031] Alternatively, it is also possible to convert an intermediate, for example polyoxyaluminum stearate, to the corresponding complex soap. In grease production, this obviates the need to release a low molecular weight alcohol, for example isopropyl alcohol.

[0032] What is advantageous about the use of the aluminum-based complex soaps as thickener, as elucidated above, is that they combine good availability with low cost.

[0033] Furthermore, aluminum complex soaps have good water resistance, pumpability, good low-temperature characteristics and high material compatibility.

[0034] The proportion of the aluminum-based complex soap in the lubricant grease composition of the invention is preferably from 1% by weight to 11% by weight, more preferably from 2% by weight to 10% by weight and especially from 3% by weight to 9% by weight, based in each case on the total weight of the lubricant grease composition.

[0035] In an embodiment of the invention, the proportion of aluminum-based complex soap and polyurea thickener together is from 2% by weight to 22% by weight, more preferably from 4% by weight to 20% by weight and especially from 6% by weight to 18% by weight, based in each case on the total weight of the lubricant grease composition.

[0036] In some embodiments the invention encompasses the use of the lubricant grease composition for lubrication of the surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners and especially of friction partners of the aforementioned type in actuators, especially in the automotive sector.

[0037] Suitable base oils are customary lubricant oils that are liquid at room temperature (20° C.). The base oil preferably has a kinematic viscosity of 18 mm.sup.2/s to 20 000 mm.sup.2/s, especially from 30 mm.sup.2/s to 400 mm.sup.2/s, at 40° C. Base oils are distinguished between mineral oils and synthetic oils. A base oil is understood to mean the customary base fluids used for the production of lubricants, especially oils that are assigned to groups I, II, II+, III, IV or V according to the classification of the American Petroleum Institute (API) [NLGI Spokesman, N. Samman, volume 70, number 11, p. 14 et seq.]. Mineral oils are classified by API group. API Group I are mineral oils consisting, for example, of naphthenic or paraffinic oils. If these mineral oils, by comparison with API Group I oils, have been chemically modified, have a low aromatics level and low sulfur level and have a low proportion of saturated compounds and hence improved viscosity/temperature characteristics, the oils are classified as API Group II and III. API Group III also includes what are called gas-to-liquid oils that are produced not from the refining of crude oil but by the chemical conversion of natural gas.

[0038] Synthetic oils include polyethers, esters, polyesters, preferably polyalphaolefins, especially metallocene polyalphaolefins, polyethers, perfluoropolyalkyl ethers (PFPAE), alkylated naphthalenes, silicone oils and alkylaromatics and mixtures thereof. The polyether compound may have free hydroxyl groups, but may also have been fully etherified or end group-esterified and/or have been prepared from a starter compound having one or more hydroxyl and/or carboxyl groups (—COOH). Also possible are polyphenol ethers, optionally alkylated, as the sole components or even better as mixed components.

[0039] Suitably usable are esters of an aromatic and/or aliphatic di-, tri- or tetracarboxylic acid with one or a mixture of C.sub.7 to C.sub.22 alcohols, esters of trimethylolpropane, pentaerythritol or dipentaerythritol with aliphatic C.sub.7 to C.sub.22 carboxylic acids, esters of C.sub.18 dimer acids with C.sub.7 to C.sub.22 alcohols, complex esters, as individual components or in any mixture.

[0040] Likewise suitable are silicone oils, native oils and derivatives of native oils.

[0041] Base oils particularly preferred in accordance with the invention are polyalphaolefins, especially metallocene polyalphaolefins, and naphthenic mineral oils according to the API Group I classification.

[0042] In an embodiment of the invention, the proportion of the base oil in the lubricant grease composition of the invention is from 55% by weight to 90% by weight, more preferably from 60% by weight to 95% by weight, and especially from 68% by weight to 92% by weight, based in each case on the total weight of the lubricant grease composition.

[0043] As well as base oil(s) and thickener(s), the composition of the invention may also contain further additives, for example antioxidants, anticorrosives, lubricity improvers, high-pressure and antiwear additives, metal deactivators, viscosity and friction improvers, dyes, friction reducers.

[0044] The addition of antioxidants can reduce or even prevent the oxidation of the lubricant grease composition of the invention, especially on use thereof. Oxidation can give rise to unwanted free radicals, resulting in an increased level of occurrence of break down reactions of the lubricant. The addition of antioxidants stabilizes the lubricant grease composition.

[0045] Antioxidants that are particularly suitable in accordance with the invention are the following compounds: styrenized diphenylamines, diaromatic amines, phenolic resins, thiophenolic resins, phosphites, butylated hydroxytoluene, butylated hydroxyanisole, phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, octylated/butylated diphenylamine, di-alpha-tocopherol, di-tert-butylphenyl, benzenepropanoic acid, sulfur-containing phenol compounds and mixtures of these components.

[0046] In addition, the lubricant grease composition may contain further additives, especially anticorrosion additives, metal deactivators or ion-complexing agents. These include triazoles, imidazolines, N-methylglycine (sarcosine), benzotriazole derivatives, N,N-bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine; n-methyl-N-(1-oxo-9-octadecenyl)-glycine, mixtures of phosphoric acid and mono- and diisooctyl esters reacted with (C.sub.11-14)-alkylamines, mixtures of phosphoric acid and mono- and diisooctyl esters reacted with tert-alkylamine and primary (C.sub.12-14)-amines, dodecanoic acid, triphenyl phosphorothionate and amine phosphates. Commercially available additives are as follows: IRGAMET® 39, IRGACOR® DSS G, Amin 0; SARKOSYL® 0 (Ciba), COBRATEC® 122, CUVAN® 303, VANLUBE®9123, CI-426, CI-426EP, CI-429 and CI-498.

[0047] Further conceivable antiwear additives are amines, amine phosphates, phosphates, thiophosphates, phosphorothionates and mixtures of these components. The commercially available antiwear additives include IRGALUBE® TPPT, IRGALUBE® 232, IRGALUBE® 349, IRGALUBE®211 and ADDITIN® RC3760 Liq 3960, FIRC—SHUN® FG 1505 and FG 1506, NA-LUBE® KR-015FG, LUBEBOND®, FLUORO® FG, SYNALOX®40-D, ACHESON® FGA 1820 and ACHESON® FGA 1810.

[0048] The proportion of the further additives is preferably from 1% by weight to 30% by weight, more preferably from 1.5% by weight to 25% by weight, and especially from 2% by weight to 20% by weight, in each case based on the total weight of the lubricant grease composition.

[0049] In addition, the lubricant grease composition may contain solid lubricants such as PTFE, boron nitride, polymer powders, for example PTFE, polyamides or polyimides, pyrophosphate, metal oxides, for example zinc oxide or magnesium oxide, metal sulfides, for example zinc sulfide, molybdenum sulfide, tungsten sulfide or tin sulfide, pyrophosphates, thiosulfates, magnesium carbonate, calcium carbonate, calcium stearate, carbon polymorphs, for example carbon black, graphite, graphene, nanotubes, fullerenes, SiO2 polymorphs, melanin cyanurate, or a mixture thereof.

[0050] The proportion of the solid lubricants is preferably from 1% by weight to 30% by weight, more preferably from 1.5% by weight to 25% by weight, and especially from 2% by weight to 20% by weight, based in each case on the total weight of the lubricant grease composition.

[0051] Further preferably, the lubricant grease composition has a worked penetration, determined to DIN ISO 2137:2016-12, of 265 to 385 0.1 mm. According to the National Lubricating Grease Institute (NLGI) scale, this corresponds to a consistency class no. 0-2 as per DIN 51818:1981-12.

[0052] In an embodiment of the invention, the lubricant grease composition has the following composition: [0053] 55°/h to 96% by weight of base oil, [0054] 1% to 11% by weight of polyurea thickener, [0055] 1% to 11% by weight of aluminum-based complex soap, [0056] 1% to 30% by weight of additives, [0057] 1% / to 30% by weight of solid lubricants.

[0058] The invention is elucidated in detail hereinafter with reference to various examples.

[0059] Production of a lubricant grease composition of the invention:

[0060] A standard production method for lubricant greases is used. Heated reactors are used, which may also be designed as an autoclave or vacuum reactor. If required, the resultant grease can be homogenized, filtered and/or devolatilized.

[0061] Production method A: Formation of a lubricant grease composition of the invention by separate production of an aluminum-based complex soap (base grease A) and a polyurea thickener (base grease B—H) with subsequent mixing and additization

[0062] Base Grease a (Aluminum-Based Complex Soap):

[0063] A heatable reaction vessel equipped with a stirrer system suitable for the production of lubricant greases is initially charged with the base oil or a portion of the base oil or oil mixture. The aluminum-based complex soap is produced therein by reaction of polyoxyaluminum stearate with benzoic acid and stearic acid. Subsequently, the reaction mixture is heated, wherein peak temperatures up to 210° C. may occur, in order to drive out the water and to melt the thickener. The subsequent cooling phase determines the morphology of the thickener. It is possible here to use residual base oil for controlled adjustment of the consistency.

[0064] Base Greases B—H (Polyurea Thickener):

[0065] A heatable reaction vessel equipped with a stirrer system suitable for the production of lubricant greases is initially charged with the base oil or a portion of the base oil or oil mixture. Subsequently, the isocyanate component(s) is/are added and heated to 60° C. while stirring. In a separate reaction vessel, a portion of the base oil is mixed with the amine component(s) at 60° C. until the solution is homogeneous. The amine solution is added while stirring the isocyanate solution and heated up to 200° C. The subsequent cooling phase determines the morphology of the thickener. It is possible here to use residual base oil for controlled adjustment of the consistency.

[0066] Base grease A and polyurea grease (base grease B—H) are mixed in a heatable reaction vessel equipped with a stirrer system suitable for the production of lubricant greases. The additives are added while stirring over and above 120° C. Once the desired consistency has been attained, the product is homogenized, and optionally filtered and devolatilized.

[0067] Production method B: Formation of the lubricant grease composition by sequential production of an aluminum-based complex soap and a polyurea thickener in the base oil with subsequent addition of the additives. A heatable reaction vessel equipped with a stirrer system suitable for the production of lubricant greases is initially charged with the base oil or a portion of the base oil or oil mixture. The aluminum-based complex soap is produced therein by reaction of polyoxyaluminum stearate with benzoic acid and stearic acid. Subsequently, the reaction mixture is heated, wherein peak temperatures up to 210° C. may occur, in order to drive out the water and to melt the thickener. Subsequently, the brew is cooled down to 60° C., and the isocyanate component(s) is/are added and melted while stirring. In a separate reaction vessel, a portion of the base oil is mixed with the amine component(s) at 60° C. until the solution is homogeneous. The amine solution is added while stirring the isocyanate solution and heated up to 200° C. The subsequent cooling phase determines the morphology of the thickener. It is possible here to use residual base oil for controlled adjustment of the consistency. The additives are added while stirring over and above 120° C. Once the desired consistency has been attained, the product is homogenized, and optionally filtered and devolatilized.

[0068] By the above-described process, the lubricant grease compositions shown in table 1 and table 2 (base greases A 1-2/base greases B—H/hybrids 1-15) are produced.

[0069] A comparison of production methods A and B is shown in table 3. Small difference in the penetration values shows that both production methods are suitable for production of a corresponding hybrid grease.

[0070] Penetration is determined to DIN ISO 2137:2016-12. What is measured is worked penetration after 60 twin strokes.

[0071] Oil separation is determined to ASTM D6184-17 with the differences described below. For table 4, the contact time is different and is 72 h, with, after every 24 h, i) determination of the amount of oil separated and ii) an increase in the temperature by 10° C. For table 5, the contact time is 30 h. A separate measurement is effected here at 130° C. and at 150° C.

TABLE-US-00001 TABLE 1 Production of base greases A1 A2 B C D E F G H Toluene 2,4-/2,6- X X X diisocyanate Diphenylmethane 4,4′- X X X X X X diisocyanate Benzoic acid X X Cyclohexylamine X X Ethylenediamine X Oleylamine X X X X X PAO X X X X X X X X Polyoxyaluminum stearate X X p-Phenetidine X X n-Octylamine X X X X X X Stearic acid X X Thickener content [% by 15 12 15 13 15 15 15 15 15 wt.] Penetration ( 1/10 mm) 330 346 285 186 185 198 234 340

TABLE-US-00002 TABLE 2 Production of hybrid greases AK component PU component PAO Penetration [% by wt.] [% by wt.] [% by wt.] [ 1/10 mm] Hybrid 1 50.0/A 2 50.0/E.sup.  — 339 Hybrid 2 48.5/A 2 24.0/G 27.5 336 Hybrid 3 47.0/A 2 23.5/C 29.0 343 Hybrid 4 53.0/A 2 26.5/H 20.0 362 Hybrid 5 62.5/A 2 32.5/B  5.0 337 Hybrid 6 62.5/A 2 32.5/H  5.0 349 Hybrid 7 73.5/A 2  6.5/F 20.0 349 Hybrid 8 66.5/A 2 13.5/F.sup.  20.0 346 Hybrid 9 53.5/A 2 26.5/F.sup.  20.0 337 Hybrid 10 40.0/A 1 40.0/G 20.0 330 Hybrid 11 37.5/A 1 37.5/C 25.0 330 Hybrid 12 50.0/A 1 50.0/H — 361 Hybrid 13 50.0/A 1 50.0/B — 342 Hybrid 14 35.0/A 1 35.0/F.sup.  30.0 320 Hybrid 15 32.5/A 1 32.5/D 35.0 325

TABLE-US-00003 TABLE 3 Comparison of production methods A/B using two hybrid greases with different thickener contents 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 Diphenylmethane 4,4′- X X X X X X X X diisocyanate Benzoic acid X X X X X X X X Oleylamine X X X X X X X X PAO X X X X X X X X Polyoxyaluminum stearate X X X X X X X X n-Octylamine X X X X X X X X Stearic acid X X X X X X X X Antioxidant package X X X X X X X X Wear resistance package X X X X X X X X Anticorrosive package X X X X X X X X Viscosity improver X X X X X X X X Friction modifier X X X X X X X X Thickener content of AK [% by 6 6 3 3 4.8 4.8 7.2 7.2 wt.] Thickener content of PU [% by 6 6 3 3 7.2 7.2 4.8 4.8 wt.] Production method A X X X X Production method B X X X X Penetration ( 1/10 mm) 290  289  370  390  305 288 301 305 5-1 5-2 6-1 6-2 7-1 8-2 8-1 8-2 Toluene 2,4-/2,6-diisocyanate X X X X X X X X Diphenylmethane 4,4′- X X X X X X X X diisocyanate Benzoic acid X X X X X X X X Oleylamine X X X X X X X X PAO X X X X X X X X Polyoxyaluminum stearate X X X X X X X X p-Phenetidine X X X X X X X X n-Octylamine X X X X X X X X Stearic acid X X X X X X X X Antioxidant package X X X X X X X X Wear resistance package X X X X X X X X Anticorrosive package X X X X X X X X Viscosity improver X X X X X X X X Friction modifier X X X X X X X X Thickener content of AK [% by 6 6 5 5 7.2 7.2 4.8 4.8 wt.] Thickener content of PU [% by 6 6 5 5 4.8 4.8 7.2 7.2 wt.] Production method A X X X X Production method B X X X X Penetration ( 1/10 mm) 335  340  350  350  340 340 310 305

TABLE-US-00004 TABLE 4 Determination of oil separation to ASTM D6184-17 after 24 h at 100° C., after +24 h at 110° C., and after +24 h at 120° C. 24 h/100° C. 24 h/110° C. 24 h/120° C. Specimen [% by wt.] [% by wt.] [% by wt.] Base grease A 12.76 16.95 21.42 Hybrid 2 5.59 8.74 11.63 Hybrid 3 6.22 8.92 11.33 Hybrid 5 4.78 7.35 9.57 Hybrid 6 8.21 10.78 12.67 Hybrid 7 9.64 13.29 15.95 Hybrid 8 6.41 9.27 11.86 Hybrid 9 4.84 6.79 8.71

TABLE-US-00005 TABLE 5 Determination of oil separation to ASTM D6184-17 at 130° C. and 150° C. for 30 h each 30 h/130° C. 30 h/150° C. Grease A 1 12.0 27.0 Grease A 2 18.3 — Hybrid 10 7.7 9.4 Hybrid 11 3.4 5.6 Hybrid 12 9.8 8.2 Hybrid 13 7.1 10.1 Hybrid 14 9.8 12.0 Hybrid 15 8.6 10.1

[0072] The following conclusions can be drawn from the results:

[0073] Table 2 shows that the hybrid greases can be produced with a multitude of combinations between a thickener comprising a complex soap on aluminum and a polyurea thickener. Table 3 shows that both the production processes named are suitable for formulating comparable greases. It is possible here to vary both the content of the thickener based on an aluminum complex soap and the content of polyurea thickener with respect to one another and also overall.

[0074] Table 4 and table 5 show from the comparison of the oil separations that hybrid greases based on a combination of a thickener comprising a complex soap on aluminum and a polyurea thickener are superior to the conventional aluminum complex soaps at higher use temperatures.

[0075] While subject matter of the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. Any statement made herein characterizing the invention is also to be considered illustrative or exemplary and not restrictive as the invention is defined by the claims. It will be understood that changes and modifications may be made, by those of ordinary skill in the art, within the scope of the following claims, which may include any combination of features from different embodiments described above.

[0076] The terms used in the claims should be construed to have the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article “a” or “the” in introducing an element should not be interpreted as being exclusive of a plurality of elements. Likewise, the recitation of “or” should be interpreted as being inclusive, such that the recitation of “A or B” is not exclusive of “A and B,” unless it is clear from the context or the foregoing description that only one of A and B is intended. Further, the recitation of “at least one of A, B and C” should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. Moreover, the recitation of “A, B and/or C” or “at least one of A, B or C” should be interpreted as including any singular entity from the listed elements, e.g., A, any subset from the listed elements, e.g., A and B, or the entire list of elements A, B and C.