EP3692120B1 - Hybrid grease with low friction coefficients and high wearing protection - Google Patents

Hybrid grease with low friction coefficients and high wearing protection Download PDF

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Publication number
EP3692120B1
EP3692120B1 EP19742289.2A EP19742289A EP3692120B1 EP 3692120 B1 EP3692120 B1 EP 3692120B1 EP 19742289 A EP19742289 A EP 19742289A EP 3692120 B1 EP3692120 B1 EP 3692120B1
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Prior art keywords
weight
thickener
grease
oil
hybrid
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EP19742289.2A
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German (de)
French (fr)
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EP3692120A1 (en
Inventor
Reiner Schmitz
Martin Wimmer
Stefan Seemeyer
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Klueber Lubrication Muenchen GmbH and Co KG
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Klueber Lubrication Muenchen SE and Co KG
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C10M107/08—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation containing butene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
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    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C10M2201/0413—Carbon; Graphite; Carbon black used as base material
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
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    • C10M2201/10—Compounds containing silicon
    • C10M2201/1006—Compounds containing silicon used as base material
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    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
    • C10M2205/0265—Butene used as base material
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    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
    • C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
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    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • C—CHEMISTRY; METALLURGY
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/045—Polyureas; Polyurethanes
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    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • C10M2229/0415—Siloxanes with specific structure containing aliphatic substituents used as base material
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/042—Siloxanes with specific structure containing aromatic substituents
    • C10M2229/0425—Siloxanes with specific structure containing aromatic substituents used as base material
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    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
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    • C10N2040/10—Running-in-oil ; Grinding
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    • C10N2050/10—Semi-solids; greasy
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Definitions

  • the present invention relates to the provision of a new hybrid grease with low coefficients of friction and high wear protection that can be used in a wide temperature range.
  • the new hybrid grease is based on a combination of a grease based on a silicone oil in conjunction with a grease based on synthetic hydrocarbon oils or polyglycols.
  • the new hybrid grease can be used to lubricate joints in vehicle parts based on plastic-steel combinations, as well as for use in actuators that are increasingly being used in vehicles, such as brakes, brake boosters, power steering (EPS) and window regulators .
  • EPS power steering
  • a high level of wear protection is achieved, among other things, with greases based on mineral oils, synthetic hydrocarbons such as PAO, esters, polyglycol or PFPE.
  • synthetic hydrocarbons such as PAO, esters, polyglycol or PFPE.
  • base oils with the highest possible viscosity index and a low pour point are required.
  • PFPE as a base oil is not an option for many applications due to its high costs.
  • additives such as PTFE are required, which, however, leads to very high raw material costs.
  • WO 2104/028632 A1 lubricant compositions which contain a silicone oil-free oil and a silicone oil as the base oil, the silicone oil being an oil-soluble oil and being selected from ethyl silicone and octyl silicone. Lithium soaps are also mentioned as thickeners.
  • EP 0 657 524 B1 describes the mixture of PFPE oils with another PFPE-insoluble oil component.
  • the WO 2013/010851 A1 discloses a lubricant composition comprising two components, a low viscosity component together with a high viscosity component that is separable from the low viscosity component at low temperatures and becomes uniform at high temperatures.
  • the WO 2008/037885 A2 relates to a highly cohesive silicone grease which comprises at least one oil-containing diorganopolysiloxane polymer, based on the weight of the silicone grease, 10 to 30% by weight of at least one organometallic soap, and 1 to 10% by weight of at least one paraffin, the grease being characterized thereby that the paraffin is halogen-free, in particular chlorine-free, and essentially consists of hydrocarbons that are linear and are obtained from petroleum distillation.
  • the CN-B-101 870 905 concerns lubricating greases based on organic silicones, such as methyl silicone, which are thickened with Aerosil/SiO 2 .
  • the CN-A-105 907 446 also describes lubricating greases based on silicone oils, such as polydimethylsiloxane, which are thickened with PTFE as a thickener.
  • the known hybrid greases refer to the mixing of PFPE fats or oils with other PFPE-free greases as well as to immiscible compositions.
  • the present invention therefore aims to provide a lubricant composition that meets the above-mentioned requirements, can be used in particular in a wider temperature range from -50 ° C to + 160 ° C and has low coefficients of friction, long running times and essentially no signs of wear the components.
  • a hybrid fat consisting of a mixture of a fat based on a silicone oil with a fat or oil based on a synthetic hydrocarbon oil or polyglycol oil and a thickener and conventional additives. What is crucial is that the two base oils or oil phases are not miscible with each other.
  • Particularly preferred is a hybrid grease in which PAO, mPAO, ethylene, LAO copolymers are used as synthetic hydrocarbons.
  • illustration 1 shows the structure of a device for determining the coefficients of friction based on a torque test in a ball joint.
  • Figure 2 shows an example of the time course of the measurement of the device in illustration 1 .
  • Figure 3 shows the device for determining wear protection using a wear protection test in a ball joint.
  • the base oil or part of the base oil or oil mixture is placed in a suitable heatable container with an agitator, as is used in the prior art for the production of lubricating greases.
  • the thickener is produced, such as the neutralization of stearic acid or 12-OH stearic acid with lithium hydroxide and a subsequent heating phase to remove the water and form the thickener structure. Peak temperatures of up to 210°C can be reached in order to completely melt the soap thickener and then adjust the morphology of the thickener through targeted cooling.
  • the additives are added and distributed homogeneously. It is also possible to produce a batch with silicone oil as base oil and thickener and the synthetic hydrocarbon oil as Add mixing component analogously to an additive.
  • the fat components (A) and (B) shown in Table 1 were prepared. All information is in% by weight. ⁇ b> ⁇ u>Table 1 ⁇ /u> ⁇ /b> Synth. KW/PAO fat A Synth. KW/PAO fat B Silicone grease Polydimethylsiloxane viscosity at 40°C 10,000 mm 2 /s - - 75% Synth. KW / PAO viscosity at 40°C 3500 mm 2 /s - 80.5% - Synth.
  • the mixture of the two fats can be produced using agitators that correspond to the state of the art in the production of lubricating greases. It is also possible to produce a batch with silicone oil as base oil and thickener and the synthetic hydrocarbon oil as a mixing component to be added analogously to an additive. It is also possible to prepare a batch with synthetic hydrocarbon oil as base oil and thickener and only add the silicone oil as a mixing component analogous to an additive. After mixing, a subsequent homogenization process step can be carried out, for example using a grinder (colloid mill), rolling mill or high-pressure homogenizer.
  • the hybrid fats according to the invention were prepared from components (A) and (B), which are shown in Table 2. All information is in% by weight. ⁇ b> ⁇ u>Table 2 ⁇ /u> ⁇ /b> Hybrid fat A Hybrid fat B Hybrid fat C Synth. KW/PAO fat A 20% - - Synth. KW/PAO fat B - 20% 10% Silicone grease 80% 80% 90%
  • test method described below was used to determine the coefficients of friction using a torque test in a ball joint.
  • the structure of the testing system is in illustration 1 shown.
  • Ball joints were used, as are installed as standard in the chassis of vehicles.
  • the balls are made of steel with a diameter of 23 mm.
  • the steel ball comes with a plastic shell POM (polyoxymethylene) enclosed.
  • the lubricant is introduced between the plastic shell and the steel ball.
  • the POM shell with the ball is then inserted into a housing in a form-fitting manner.
  • the housing is pressed in such a way that a certain force is exerted on the system of shell and ball.
  • the surface pressure is approximately 1 N/mm 2 .
  • Table 3 shows the results of determining the coefficients of friction using a torque test. ⁇ b> ⁇ u>Table 3 ⁇ /u> ⁇ /b> Pattern Synth. KW/PAO fat A Synth. KW/PAO fat B Silicone grease Hybrid fat A Hybrid fat B Hybrid fat C Release torque at +25°C 6 Nm 5.8 Nm 3.2 Nm 5 Nm 3.2 Nm 3.1Nm Release torque at -40°C 3.9 Nm 3.2 Nm 2.7 Nm 3.6 Nm 2.7 Nm 2.6 Nm Release torque at +80°C 5.5 Nm 5.7 Nm 3.2 Nm 5.4 Nm 3.2 Nm 3.1Nm Running torque at +25°C 2.5 Nm 1.6Nm 1.8Nm 1.8Nm 1.6Nm 1.6Nm Running torque at -40°C 2.7 Nm 2.0 Nm 0.9Nm 0.6 Nm 0.8Nm 0.8Nm Running torque at +80°C 3 Nm 2.5 Nm (stick slip) 2.3 Nm 2.6 Nm 2.3 N
  • the release and running moments could be positively influenced by hybridization.
  • the low release torques and running torques of the silicone grease over the entire temperature range were particularly advantageously achieved and in some cases even exceeded, ie reduced, with the hybrid greases B and C.
  • the wear test was carried out in a ball joint.
  • the ball joint described is subjected to a load of 3240N by a device.
  • the device is movably mounted so that the ball can be tilted in the POM shell.
  • the tilting movement is carried out with a deflection of 3° and a frequency of 15 Hz.
  • the movement is stopped at regular intervals and the play caused by wear is determined by relieving and reversing the load.
  • the wear values could be positively influenced by hybridization. A very good level of wear could be achieved, particularly with the hybrid grease B.

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Description

Die vorliegende Erfindung betrifft die Bereitstellung eines neuen Hybridfettes mit niedrigen Reibwerten und hohem Verschleißschutz, das in einem weiten Temperaturbereich eingesetzt werden kann. Das neue Hybridfett basiert auf einer Kombination von einem Fett auf Basis eines Silikonöls in Verbindung mit einem Fett auf Basis von synthetischen Kohlenwasserstoffölen oder Polyglykolen. Insbesondere kann das neue Hybridfett zur Schmierung von Gelenken in Fahrzeugteilen auf der Basis von Kunststoff-Stahl-Paarungen verwendet werden, des weiteren zur Anwendung in Aktuatoren, die in Fahrzeugen zunehmend Einsatz finden, wie beispielsweise in Bremsen, Bremskraftverstärkern, Lenkunterstützung (EPS) sowie Fensterhebern.The present invention relates to the provision of a new hybrid grease with low coefficients of friction and high wear protection that can be used in a wide temperature range. The new hybrid grease is based on a combination of a grease based on a silicone oil in conjunction with a grease based on synthetic hydrocarbon oils or polyglycols. In particular, the new hybrid grease can be used to lubricate joints in vehicle parts based on plastic-steel combinations, as well as for use in actuators that are increasingly being used in vehicles, such as brakes, brake boosters, power steering (EPS) and window regulators .

Besonders niedrige Reibwerte, die zudem sehr konstant über einen weiten Temperaturbereich aufrechterhalten werden können, werden mit einem Schmierstoff auf Basis Silikonöl erreicht. Zur weiteren Verbesserung des Reibwertes und Stick-Slip-Verhaltens ist eine hohe Grundölviskosität erforderlich. Silikonfette, insbesondere diejenigen auf Basis von Polydimethysiloxan haben einen sehr hohen Viskositätsindex sowie einen niedrigen Stockpunkt. Damit können die oben beschriebenen Eigenschaften erreicht werden. Die Fettzusammensetzungen auf Basis von Silikonölen zeigen jedoch Schwächen im Verschleißschutz, insbesondere bei hoch belasteten Anwendungen, wie beispielsweise hoch verspannten Fahrwerksgelenken.Particularly low coefficients of friction, which can also be maintained very consistently over a wide temperature range, are achieved with a lubricant based on silicone oil. To further improve the coefficient of friction and stick-slip behavior, a high base oil viscosity is required. Silicone greases, especially those based on polydimethysiloxane, have a very high viscosity index and a low pour point. This allows the properties described above to be achieved. However, the grease compositions based on silicone oils show weaknesses in wear protection, especially in highly stressed applications, such as highly stressed chassis joints.

Ein hoher Verschleißschutz wird unter anderem mit Fetten auf Basis von Mineralölen, synthetischen Kohlenwasserstoffen, wie PAO, Ester, Polyglykol oder PFPE erreicht. Um einen weiten Temperaturbereich abzudecken, sind Grundöle mit einem möglichst hohen Viskositätsindex und einem niedrigen Stockpunkt erforderlich. PFPE als Grundöl kommt aufgrund der hohen Kosten für viele Anwendungen nicht in Frage. Selbst mit den aktuellen Entwicklungen auf Basis synthetischer Kohlenwasserstoffe, z.B. m-PAOs (Metallocen-PAO) lässt sich dieses Ziel nur begrenzt erreichen. Um mit Systemen auf der Basis von synthetischen Kohlenwasserstoffen einen niedrigen Reibwert zu erzielen, sind Additive, wie z.B. PTFE erforderlich, was jedoch zu sehr hohen Rohstoffkosten führt.A high level of wear protection is achieved, among other things, with greases based on mineral oils, synthetic hydrocarbons such as PAO, esters, polyglycol or PFPE. In order to cover a wide temperature range, base oils with the highest possible viscosity index and a low pour point are required. PFPE as a base oil is not an option for many applications due to its high costs. Even with current developments based on synthetic hydrocarbons, e.g. m-PAOs (metallocene PAO) This goal can only be achieved to a limited extent. In order to achieve a low coefficient of friction with systems based on synthetic hydrocarbons, additives such as PTFE are required, which, however, leads to very high raw material costs.

Aus der WO 2104/028632 A1 sind Schmiermittelzusammensetzungen bekannt, die als Basisöl ein silikonölfreies Öl und ein Silikonöl enthalten, wobei das Silikonöl ein öllöslisches Öl ist und ausgewählt wird aus Ethylsilikon, Oktylsilikon. Des weiteren werden als Verdickungsmittel Lithiumseifen genannt.From the WO 2104/028632 A1 lubricant compositions are known which contain a silicone oil-free oil and a silicone oil as the base oil, the silicone oil being an oil-soluble oil and being selected from ethyl silicone and octyl silicone. Lithium soaps are also mentioned as thickeners.

Die US 4 251 431 B beschreibt die Herstellung von Ölen auf Basis von PFPE mit Methylpolysiloxanen als Hybridfette, wobei die beiden Ölphasen unlöslich sind.The US 4,251,431 B describes the production of oils based on PFPE with methylpolysiloxanes as hybrid fats, where the two oil phases are insoluble.

Auch die EP 0 657 524 B1 beschreibt die Mischung von PFPE-Ölen mit einer weiteren PFPE unlöslichen Ölkomponente.Also the EP 0 657 524 B1 describes the mixture of PFPE oils with another PFPE-insoluble oil component.

Die WO 2013/010851 A1 offenbart eine Schmierstoffzusammensetzung, die zwei Bestandteile aufweist, einen niedrigviskosen Bestandteil zusammen mit einem hochviskosen Bestandteil, der bei niedrigen Temperaturen von dem niedrigviskosen Bestandteil abscheidbar ist und bei hohen Temperaturen gleichmäßig wird.The WO 2013/010851 A1 discloses a lubricant composition comprising two components, a low viscosity component together with a high viscosity component that is separable from the low viscosity component at low temperatures and becomes uniform at high temperatures.

Die WO 2008/037885 A2 betrifft ein hoch-kohäsives Silikonfett, das mindestens ein ölhaltiges Diorganopolysiloxanpolymer, bezogen auf das Gewicht des Silikonfetts 10 bis 30 Gew.-% mindestens einer metallorganischen Seife, und 1 bis 10 Gew.-% mindestens eines Paraffins umfasst, wobei das Fett dadurch gekennzeichnet ist, dass das Paraffin halogenfrei, insbesondere chlorfrei ist und im Wesentlichen aus Kohlenwasserstoffen besteht, die linear sind und aus der Erdöldestillation gewonnen werden.The WO 2008/037885 A2 relates to a highly cohesive silicone grease which comprises at least one oil-containing diorganopolysiloxane polymer, based on the weight of the silicone grease, 10 to 30% by weight of at least one organometallic soap, and 1 to 10% by weight of at least one paraffin, the grease being characterized thereby that the paraffin is halogen-free, in particular chlorine-free, and essentially consists of hydrocarbons that are linear and are obtained from petroleum distillation.

Die CN-B-101 870 905 betrifft Schmierfette auf der Basis von organischen Silikonen, wie Methylsilikon, die mit Aerosil/SiO2 verdickt werden.The CN-B-101 870 905 concerns lubricating greases based on organic silicones, such as methyl silicone, which are thickened with Aerosil/SiO 2 .

Die CN-A-105 907 446 beschreibt ebenfalls Schmierfette auf der Basis von Silikonölen, wie Polydimethylsiloxan, die mit PTFE als Verdickungsmittel verdickt werden.The CN-A-105 907 446 also describes lubricating greases based on silicone oils, such as polydimethylsiloxane, which are thickened with PTFE as a thickener.

Die bekannten Hybridfette beziehen sich auf die Abmischung von PFPE-Fetten oder Ölen mit anderen in PFPE-freien Schmierfetten sowie auf nicht mischbare Zusammensetzungen.The known hybrid greases refer to the mixing of PFPE fats or oils with other PFPE-free greases as well as to immiscible compositions.

Die vorliegende Erfindung zielt daher darauf ab, eine Schmierstoffzusammensetzung bereitzustellen, die den oben genannten Anforderungen genügt, insbesondere in einem weiteren Temperaturbereich von -50°C bis +160°C anwendbar ist und dabei niedrige Reibwerte, sowie lange Laufzeiten und im wesentlichen keine Verschleißerscheinungen bei den Bauteilen bewirkt.The present invention therefore aims to provide a lubricant composition that meets the above-mentioned requirements, can be used in particular in a wider temperature range from -50 ° C to + 160 ° C and has low coefficients of friction, long running times and essentially no signs of wear the components.

Hierzu wird erfindungsgemäß ein Hybridfett bestehend aus einer Mischung aus einem Fett auf Basis eines Silkonöls mit einem Fett oder Öl auf Basis eines synthetischen Kohlenwasserstofföls oder Polyglykolöls und einem Verdickungsmittel und üblichen Additiven bereitgestellt. Entscheidend ist, dass die beiden Basisöle bzw. Ölphasen nicht miteinander mischbar sind.For this purpose, according to the invention, a hybrid fat is provided consisting of a mixture of a fat based on a silicone oil with a fat or oil based on a synthetic hydrocarbon oil or polyglycol oil and a thickener and conventional additives. What is crucial is that the two base oils or oil phases are not miscible with each other.

In " Synthetic Lubricants and High Performance Functional fluids" (Editor R. L. Shubkin), Marcel Dekker Inc, New York, Basel, Hong Kong 1993, ISBN 0-8247-8715-3 finden sich Angaben zu den typischen PAO (Seite 1 bis 40 ), zu Silikonölen (S. 183 bis 203 ) und Polyglykolen (S. 101 bis 123 ). Metallocen katalysierte PAO wurden beispielsweise von ExxonMobil im Rahmen eines Vortrages (" The influence of Molecular Structure on the Properties of Polyalphaolefins", Autoren Bruce Harrington, Sandy Reid-Peters ) auf dem 19th Internationalen Tribologie Kolloquium in Esslingen (21. bis 23.Januar 2014 ) vorgestellt.In " Synthetic Lubricants and High Performance Functional fluids" (Editor RL Shubkin), Marcel Dekker Inc, New York, Basel, Hong Kong 1993, ISBN 0-8247-8715-3 find each other Information on the typical PAO (pages 1 to 40 ), to Silicone oils (pp. 183 to 203 ) and Polyglycols (pp. 101 to 123 ). Metallocene-catalyzed PAO, for example, was presented by ExxonMobil in a lecture (" The influence of Molecular Structure on the Properties of Polyalphaolefins", authors Bruce Harrington, Sandy Reid-Peters ) on the 19th International Tribology Colloquium in Esslingen (January 21st to 23rd, 2014 ) presented.

In Ullmanns Encyklopädie der technischen Chemie, 4., neubearbeitete und erweiterte Auflagen, Verlag Chemie, 1981, Band 20 finden sich im Beitrag "Schmierstoff und verwandte Produkte", (Seite 457 bis 671 ) von D. Klamman ebenfalls Angaben zu Silikonölen (S. 523 bis 525 ). Die Viskosität der Öle kann dabei von 18 mm2/s bis 20000 mm2/s bei 40°C betragen.In Ullmann's Encyclopedia of Technical Chemistry, 4th, revised and expanded editions, Verlag Chemie, 1981, Volume 20 can be found in the article “Lubricants and Related Products,” (pages 457 to 671 ) from D. Klamman also provides information on silicone oils (pp. 523 to 525 ). The viscosity of the oils can be from 18 mm 2 /s to 20,000 mm 2 /s at 40°C.

Normalerweise ist es nicht möglich ein Silikonöl mit einem synthetischen Kohlenwasserstofföl zu mischen. Überraschenderweise lassen sich aber Fette mischen, die auf unmischbaren Grundölen aufgebaut sind, wie z.B. als Silikonöl Polydimethysiloxan und als synthetischen Kohlenwasserstoff, z.B. PAO. Diese können so gemischt werden, dass ein homogener Schmierstoff entsteht. Außerdem ist es möglich einen Ansatz mit Silikonöl als Basisöl und Verdicker herzustellen und das synthetische Kohlenwasserstofföl als Mischkomponente analog einem Additiv zuzugeben. Ebenfalls möglich ist es, einen Ansatz mit synthetischem Kohlenwasserstofföl als Basisöl und Verdicker herzustellen und nur das Silikonöl als Mischkomponente analog einem Additiv zuzugeben. Die Mischung kann mit Rührwerken wie sie in der Herstellung von Schmierfetten dem Stand der Technik entsprechen gefertigt werden. Nach dem Mischen kann ein nachgeschalteter Homogenisierungsprozessschritt, beispielsweise mittels Mahlwerk (Kolloidmühle), Walzwerk oder Hochdruckhomogenisator erfolgen. Der so hergestellte Schmierstoff zeigt alle oben geforderten und gewünschten Eigenschaften.Normally it is not possible to mix a silicone oil with a synthetic hydrocarbon oil. Surprisingly, it is possible to mix fats that are based on immiscible base oils, such as silicone oil polydimethysiloxane and synthetic hydrocarbons, e.g. PAO. These can be mixed in such a way that a homogeneous lubricant is created. It is also possible to produce a batch with silicone oil as base oil and thickener and to add the synthetic hydrocarbon oil as a mixing component analogous to an additive. It is also possible to produce a batch with synthetic hydrocarbon oil as base oil and thickener and only add the silicone oil as a mixing component analogous to an additive. The mixture can be produced using state-of-the-art agitators used in the production of lubricating greases. After mixing, a subsequent homogenization process step can take place, for example using a grinder (colloid mill), rolling mill or high-pressure homogenizer. The lubricant produced in this way shows all of the properties required and desired above.

Das Silikonöl wird ausgewählt aus der Gruppe bestehend aus Polydimethylsiloxan, Polyphenylmethylsiloxan oder Mischungen aus beiden Ölen. Das synthetische Kohlenwasserstofföl wird ausgewählt aus der Gruppe bestehend aus PAO, Mischungen aus PAO und Olefincopolymeren, Mischungen aus PAO und Polyisobutylen. Das Verdickungsmittel ist ein Seifenverdickungsmittel und wird ausgewählt aus der Gruppe bestehend aus Lithium-12-hydroxystearat und Lithiumstearat.The silicone oil is selected from the group consisting of polydimethylsiloxane, polyphenylmethylsiloxane or mixtures of both oils. The synthetic hydrocarbon oil is selected from the group consisting of PAO, blends of PAO and olefin copolymers, blends of PAO and polyisobutylene. The thickener is a soap thickener and is selected from the group consisting of lithium 12-hydroxystearate and lithium stearate.

Des weiteren können übliche Additive wie Antioxidantien, Korrosionsschutzmittel sowie ein Festschmierstoff in dem erfindungsgemäßen Hybridfett enthalten sein.Furthermore, common additives such as antioxidants, corrosion inhibitors and a solid lubricant can be contained in the hybrid grease according to the invention.

Für das erfindungsgemäße Hybridfett werden

  1. (A) 10 bis 50 Gew.-% eines Fettes auf Basis eines synthetischen Kohlenwasserstofföls oder Polyglykol enthaltend 50 bis 90 Gew.-% Grundöl, ausgewählt aus synthetischen Kohlenwasserstofföl, PAO, Mineralöl oder Polyglykol, 10 bis 25 Gew.-% Verdickungsmittel, 0 bis 10 Gew.-% Additive mit
  2. (B) 50 bis 90 Gew.-% eines Silikonfetts, enthaltend 70 bis 90 Gew.-% Silikonöl 5 bis 30 Gew.-% Verdickungsmittel sowie bis zu 0 bis 10 Gew.-% Additive, gemischt,
wobei das Verdickungsmittel ein Seifenverdickungsmittel ist und ausgewählt wird aus der Gruppe bestehend aus Lithium-12-hydroxystearat und Lithiumstearat.For the hybrid fat according to the invention
  1. (A) 10 to 50% by weight of a fat based on a synthetic hydrocarbon oil or polyglycol containing 50 to 90% by weight of base oil selected from synthetic hydrocarbon oil, PAO, mineral oil or polyglycol, 10 to 25% by weight of thickener, 0 up to 10% by weight of additives
  2. (B) 50 to 90% by weight of a silicone grease, containing 70 to 90% by weight of silicone oil, 5 to 30% by weight of thickener and up to 0 to 10% by weight of additives, mixed,
wherein the thickener is a soap thickener and is selected from the group consisting of lithium 12-hydroxystearate and lithium stearate.

Wahlweise kann die Komponente (A) Festschmierstoff enthalten. Festschmierstoffe können zum Beispiel PTFE, Graphit, Molybdändisulfid, Melamincyanurat und Mischungen daraus sein.Optionally, component (A) can contain solid lubricant. Solid lubricants can be, for example, PTFE, graphite, molybdenum disulfide, melamine cyanurate and mixtures thereof.

Insbesondere bevorzugt werden für das erfindungsgemäße Hybridfett

  1. (A) 10 bis 20 Gew.-% eines Fettes enthaltend 70 bis 90 Gew.-% Grundöl, ausgewählt aus synthetischen Kohlenwasserstofföl oder Polyglykol, 10 bis 20 Gew.-% Verdickungsmittel, 1 bis 7 Gew.-% Additive mit
  2. (B) 80 bis 90 Gew.-% eines Silikonfetts, enthaltend 70 bis 80 Gew.-% Polydimethylsiloxan, bis zu 30 Gew.-% Verdickungsmittel sowie 1 bis 10 Gew.% Additive, gemischt,
wobei das Verdickungsmittel ein Seifenverdickungsmittel ist und ausgewählt wird aus der Gruppe bestehend aus Lithium-12-hydroxystearat und Lithiumstearat.Particular preference is given to the hybrid fat according to the invention
  1. (A) 10 to 20% by weight of a fat containing 70 to 90% by weight of base oil selected from synthetic hydrocarbon oil or polyglycol, 10 to 20% by weight of thickener, 1 to 7% by weight of additives
  2. (B) 80 to 90% by weight of a silicone grease containing 70 to 80% by weight of polydimethylsiloxane, up to 30% by weight of thickener and 1 to 10% by weight of additives, mixed,
wherein the thickener is a soap thickener and is selected from the group consisting of lithium 12-hydroxystearate and lithium stearate.

Besonders bevorzugt ist ein Hybridfett, bei dem als synthetische Kohlenwasserstoffe PAO, mPAO, Ethylen, LAO Copolymere verwendet werden.Particularly preferred is a hybrid grease in which PAO, mPAO, ethylene, LAO copolymers are used as synthetic hydrocarbons.

Abbildung 1 zeigt den Aufbau einer Vorrichtung zur Bestimmung der Reibwerte anhand einer Drehmomentprüfung in einem Kugelgelenk. illustration 1 shows the structure of a device for determining the coefficients of friction based on a torque test in a ball joint.

Abbildung 2 zeigt beispielhaft den zeitlichen Verlauf der Messung der Vorrichtung in Abbildung 1. Figure 2 shows an example of the time course of the measurement of the device in illustration 1 .

Abbildung 3 zeigt die Vorrichtung zur Bestimmung des Verschleißschutzes anhand einer Verschleißschutzprüfung in einem Kugelgelenk. Figure 3 shows the device for determining wear protection using a wear protection test in a ball joint.

Die Erfindung wird nun durch die folgenden Beispiele näher erläutert.The invention is now explained in more detail by the following examples.

BeispieleExamples Herstellung:Production:

Es wird ein Standardherstellverfahren nach dem Stand der Technik für Schmierfette eingesetzt.A standard, state-of-the-art manufacturing process for lubricating greases is used.

Das Grundöl bzw. ein Teil des Grundöles oder Ölgemisches wird in einem geeigneten heizbaren Behälter mit Rührwerk, wie er dem Stand der Technik für die Herstellung von Schmierfetten genutzt wird, vorgelegt. Darin erfolgt die Herstellung des Verdickers, wie beispielsweise die Neutralisation von Stearinsäure oder 12-OH-Stearinsäure mit Lithiumhydroxid und anschließender Heizphase zur Entfernung des Wassers sowie zur Ausbildung der Verdickerstruktur. Als Spitzentemperaturen können bis zu 210°C erreicht werden, um den Seifenverdicker komplett aufzuschmelzen und anschließend durch gezieltes Abkühlen die Morphologie des Verdickers einzustellen. In der anschließenden Abkühlphase werden die Additive zugegeben und homogen verteilt. Außerdem ist es möglich einen Ansatz mit Silikonöl als Basisöl und Verdicker herzustellen und das synthetische Kohlenwasserstofföl als Mischkomponente analog einem Additiv zuzugeben. Ebenfalls möglich ist es einen Ansatz mit synthetischem Kohlenwasserstofföl als Basisöl und Verdicker herzustellen und nur das Silikonöl als Mischkomponente analog einem Additiv zuzugeben. Im Anschluss erfolgt ein Homogenisierungsprozess z.B. über ein Walzwerk oder eine Kolloidmühle oder einem Hochdruckhomogenisator wie es nach dem Stand der Technik für die Herstellung von Schmierfetten üblich ist.The base oil or part of the base oil or oil mixture is placed in a suitable heatable container with an agitator, as is used in the prior art for the production of lubricating greases. This is where the thickener is produced, such as the neutralization of stearic acid or 12-OH stearic acid with lithium hydroxide and a subsequent heating phase to remove the water and form the thickener structure. Peak temperatures of up to 210°C can be reached in order to completely melt the soap thickener and then adjust the morphology of the thickener through targeted cooling. In the subsequent cooling phase, the additives are added and distributed homogeneously. It is also possible to produce a batch with silicone oil as base oil and thickener and the synthetic hydrocarbon oil as Add mixing component analogously to an additive. It is also possible to produce a batch with synthetic hydrocarbon oil as base oil and thickener and only add the silicone oil as a mixing component analogous to an additive. A homogenization process then takes place, for example via a rolling mill or a colloid mill or a high-pressure homogenizer, as is usual in the state of the art for the production of lubricating greases.

Nach dem oben beschriebenen Verfahren wurden die in Tabelle 1 gezeigten Fettkomponenten (A) und (B) hergestellt. Alle Angaben sind in Gew.-%. Tabelle 1 Synth. KW/PAO-Fett A Synth. KW/ PAO Fett B Silikonfett Polydimethylsiloxan Viskosität bei 40°C 10000 mm2/s - - 75% Synth. KW / PAO Viskosität bei 40°C 3500 mm2/s - 80,5% - Synth. KW / PAO Viskosität bei 40°C 350 mm2/s 74% - - Verdicker: Lithium 12-OH-Stearat / Lithiumstearat 20% 13% 24% Antioxidant 1% 0,5% - Korrosionsschutz 5% 1% 1% Festschmierstoff - 5% - According to the method described above, the fat components (A) and (B) shown in Table 1 were prepared. All information is in% by weight. <b><u>Table 1</u></b> Synth. KW/PAO fat A Synth. KW/PAO fat B Silicone grease Polydimethylsiloxane viscosity at 40°C 10,000 mm 2 /s - - 75% Synth. KW / PAO viscosity at 40°C 3500 mm 2 /s - 80.5% - Synth. KW / PAO viscosity at 40°C 350 mm 2 /s 74% - - Thickener: Lithium 12-OH stearate / lithium stearate 20% 13% 24% Antioxidant 1% 0.5% - Corrosion protection 5% 1% 1% Solid lubricant - 5% -

Hybridfette:Hybrid fats:

Die Mischung der beiden Fette kann mit Rührwerken, wie sie in der Herstellung von Schmierfetten dem Stand der Technik entsprechen gefertigt werden. Außerdem ist es möglich einen Ansatz mit Silikonöl als Basisöl und Verdicker herzustellen und das synthetische Kohlenwasserstofföl als Mischkomponente analog einem Additiv zuzugeben. Ebenfalls möglich ist es, einen Ansatz mit synthetischem Kohlenwasserstofföl als Basisöl und Verdicker herzustellen und nur das Silikonöl als Mischkomponente analog einem Additiv zuzugeben. Nach dem Mischen kann ein nachgeschalteter Homogenisierungsprozessschritt beispielsweise mittels Mahlwerk (Kolloidmühle) Walzwerk oder Hochdruckhomogenisator erfolgen.The mixture of the two fats can be produced using agitators that correspond to the state of the art in the production of lubricating greases. It is also possible to produce a batch with silicone oil as base oil and thickener and the synthetic hydrocarbon oil as a mixing component to be added analogously to an additive. It is also possible to prepare a batch with synthetic hydrocarbon oil as base oil and thickener and only add the silicone oil as a mixing component analogous to an additive. After mixing, a subsequent homogenization process step can be carried out, for example using a grinder (colloid mill), rolling mill or high-pressure homogenizer.

Nach diesem Verfahren wurden die erfindungsgemäßen Hybridfette aus den Komponenten (A) und (B) hergestellt, die in Tabelle 2 gezeigt sind. Alle Angaben sind in Gew.-%. Tabelle 2 Hybridfett A Hybridfett B Hybridfett C Synth. KW/PAO Fett A 20% - - Synth. KW/PAO Fett B - 20% 10% Silikonfett 80% 80% 90% According to this process, the hybrid fats according to the invention were prepared from components (A) and (B), which are shown in Table 2. All information is in% by weight. <b><u>Table 2</u></b> Hybrid fat A Hybrid fat B Hybrid fat C Synth. KW/PAO fat A 20% - - Synth. KW/PAO fat B - 20% 10% Silicone grease 80% 80% 90%

Bestimmung der ReibwerteDetermination of the coefficients of friction

Zur Bestimmung der Reibwerte anhand einer Drehmomentprüfung in einem Kugelgelenk wurde das nachfolgend beschriebene Prüfverfahren verwendet. Der Aufbau der Prüfanlage ist in Abbildung 1 gezeigt.The test method described below was used to determine the coefficients of friction using a torque test in a ball joint. The structure of the testing system is in illustration 1 shown.

Zum Einsatz kamen Kugelgelenke, wie sie im Fahrwerk von Fahrzeugen serienmäßig verbaut werden. Die Kugeln sind aus Stahl mit einen Durchmessen von 23 mm. Die Stahlkugel wird mit einer Kunststoffschale aus POM (Polyoxymethylen) umschlossen. Zwischen der Kunststoffschale und der Stahlkugel wird der Schmierstoff eingebracht. Anschließend wird die POM-Schale mit der Kugel in einem Gehäuse formschlüssig eingebracht. Das Gehäuse wird so verpresst, dass eine bestimmte Kraft auf das System aus Schale und Kugel ausgeübt wird. Im vorliegenden Beispiel liegt die Flächenpressung bei ca. 1 N/mm2.Ball joints were used, as are installed as standard in the chassis of vehicles. The balls are made of steel with a diameter of 23 mm. The steel ball comes with a plastic shell POM (polyoxymethylene) enclosed. The lubricant is introduced between the plastic shell and the steel ball. The POM shell with the ball is then inserted into a housing in a form-fitting manner. The housing is pressed in such a way that a certain force is exerted on the system of shell and ball. In the present example, the surface pressure is approximately 1 N/mm 2 .

Tabelle 3 zeigt die Ergebnisse der Bestimmung der Reibwerte anhand einer Drehmomentprüfung. Tabelle 3 Muster Synth. KW / PAO-Fett A Synth. KW / PAO-Fett B Silikonfett Hybridfett A Hybridfett B Hybridfett C Lösemoment bei +25°C 6 Nm 5,8 Nm 3,2 Nm 5 Nm 3,2 Nm 3,1 Nm Lösemoment bei -40°C 3,9 Nm 3,2 Nm 2,7 Nm 3,6 Nm 2,7 Nm 2,6 Nm Lösemoment bei +80°C 5,5 Nm 5,7 Nm 3,2 Nm 5,4 Nm 3,2 Nm 3,1 Nm Laufmoment bei +25°C 2,5 Nm 1,6 Nm 1,8 Nm 1,8 Nm 1,6 Nm 1,6 Nm Laufmoment bei -40°C 2,7 Nm 2,0 Nm 0,9 Nm 0,6 Nm 0,8 Nm 0,8 Nm Laufmoment bei +80°C 3 Nm 2,5 Nm (stick slip) 2,3 Nm 2,6 Nm 2,3 Nm 2,2 Nm Table 3 shows the results of determining the coefficients of friction using a torque test. <b><u>Table 3</u></b> Pattern Synth. KW/PAO fat A Synth. KW/PAO fat B Silicone grease Hybrid fat A Hybrid fat B Hybrid fat C Release torque at +25°C 6 Nm 5.8 Nm 3.2 Nm 5 Nm 3.2 Nm 3.1Nm Release torque at -40°C 3.9 Nm 3.2 Nm 2.7 Nm 3.6 Nm 2.7 Nm 2.6 Nm Release torque at +80°C 5.5 Nm 5.7 Nm 3.2 Nm 5.4 Nm 3.2 Nm 3.1Nm Running torque at +25°C 2.5 Nm 1.6Nm 1.8Nm 1.8Nm 1.6Nm 1.6Nm Running torque at -40°C 2.7 Nm 2.0 Nm 0.9Nm 0.6 Nm 0.8Nm 0.8Nm Running torque at +80°C 3 Nm 2.5 Nm (stick slip) 2.3 Nm 2.6 Nm 2.3 Nm 2.2 Nm

Gegenüber den Fetten auf Basis von synthetischen Kohlenwasserstoffen konnten durch Hybridisierung die Löse- und Laufmomente positiv beeinflusst werden. Die niedrigen Lösemomente sowie Laufmomente des Silikonfettes über den gesamten Temperaturbereich konnten insbesondere mit den Hybridfetten B und C besonders vorteilhaft erreicht und zum Teil sogar noch übertroffen, d.h. erniedrigt werden.Compared to greases based on synthetic hydrocarbons, the release and running moments could be positively influenced by hybridization. The low release torques and running torques of the silicone grease over the entire temperature range were particularly advantageously achieved and in some cases even exceeded, ie reduced, with the hybrid greases B and C.

Bestimmung des VerschleißschutzesDetermination of wear protection

Die Verschleißprüfung wurde in einem Kugelgelenk durchgeführt.The wear test was carried out in a ball joint.

Das beschriebene Kugelgelenk wird durch eine Vorrichtung mit einer Last von 3240N beaufschlagt. Die Vorrichtung ist beweglich gelagert, so dass die Kugel in der POM-Schale gekippt werden kann. Die Kippbewegung wird mit einer Auslenkung von 3° und einer Frequenz von 15 Hz durchgeführt. In regelmäßigen Abständen wird die Bewegung angehalten und durch Entlastung sowie Umkehrung der Last wird das durch den Verschleiß entstandene Spiel ermittelt.The ball joint described is subjected to a load of 3240N by a device. The device is movably mounted so that the ball can be tilted in the POM shell. The tilting movement is carried out with a deflection of 3° and a frequency of 15 Hz. The movement is stopped at regular intervals and the play caused by wear is determined by relieving and reversing the load.

Der Aufbau der Apparatur zur Verschleißschutzprüfung ist in Abbildung 3 gezeigt.The structure of the apparatus for wear protection testing is in Figure 3 shown.

Das Ergebnis der Verschleißprüfung ist in Tabelle 4 gezeigt.The result of the wear test is shown in Table 4.

Ausgewertet wurde der Verschleißweg des Gelenkes nach 1,1 Mio. Lastwechseln Tabelle 4 Muster Synth. KW / PAO-Fett A Synth. KW / PAO-Fett B Silikonfett Hybridfett A Hybridfett B Hybridfett C Verschleißweg (mm) 0,25 mm 0,15 mm >0,65 mm 0,4 mm 0,2 mm 0,3 mm The wear path of the joint was evaluated after 1.1 million load changes <b><u>Table 4</u></b> Pattern Synth. KW/PAO fat A Synth. KW/PAO fat B Silicone grease Hybrid fat A Hybrid fat B Hybrid fat C Wear distance (mm) 0.25mm 0.15mm >0.65mm 0.4mm 0.2mm 0.3mm

Gegenüber dem Silikonfett konnten durch Hybridisierung die Verschleißwerte positiv beeinflusst werden. Insbesondere mit dem Hybridfette B konnte ein sehr gutes Verschleißniveau erreicht werden.Compared to silicone grease, the wear values could be positively influenced by hybridization. A very good level of wear could be achieved, particularly with the hybrid grease B.

Claims (7)

  1. Hybrid grease, comprising
    (A) 10 to 50% by weight of a grease based on a synthetic hydrocarbon oil or polyglycol, containing 50 to 90% by weight of base oil, selected from synthetic hydrocarbon oil, PAO, or polyglycol, 10 to 25% by weight of thickener, 0 to 10% by weight of additives, and
    (B) 50 to 90% by weight of a silicone grease, containing 70 to 90% by weight of silicone oil, selected from the group consisting of polydimethyl siloxane, polyphenyl methyl siloxane, or mixtures thereof, 5 to 30% by weight of thickener, and 0 to 10% by weight of additives,
    wherein the thickener is a soap thickener, and is selected from the group consisting of lithium-12-hydroxy stearate and lithium stearate.
  2. Hybrid grease according to claim 1, comprising in particular
    (A) 10 to 20% by weight of a grease based on a synthetic hydrocarbon oil or polyglycol, containing 70 to 80% by weight of base oil, selected from synthetic hydrocarbon oil, PAO, or polyglycol, 10 to 20% by weight of thickener, 1 to 7% by weight of additives, and
    (B) 80 to 90% by weight of a silicone grease, containing 70 to 80% by weight of silicone oil, selected from the group consisting of polydimethyl siloxane, polyphenyl methyl siloxane, or mixtures thereof, 10 to 30% by weight of thickener, and 1 to 10% by weight of additives,
    wherein the thickener is a soap thickener and is selected from the group consisting of lithium-12-hydroxy stearate and lithium stearate.
  3. Hybrid grease according to claim 1 or 2, which additionally contains a grease lubricant in the component (A).
  4. Hybrid grease according to any one of claims 1 to 3, which, as a synthetic hydrocarbon oil, contains an oil selected from the group consisting of PAO, mixtures of PAO and olefin copolymers, mixtures of PAO and polyisobutylene.
  5. Use of a hybrid grease according to any one of claims 1 to 4, for the lubrication of joints in the automotive sector.
  6. Use of a hybrid grease according to claim 5, for the lubrication of joints on the basis of plastic/steel pairings.
  7. Use of a hybrid grease according to any one of claims 1 to 4, for the lubrication of actuators, such as are used in motor vehicles for steering support (EPS), brake actuators, braking force amplifiers, and window raisers.
EP19742289.2A 2018-07-24 2019-07-12 Hybrid grease with low friction coefficients and high wearing protection Active EP3692120B1 (en)

Applications Claiming Priority (2)

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DE102018005835.3A DE102018005835A1 (en) 2018-07-24 2018-07-24 Hybrid grease with low friction and high wear protection
PCT/EP2019/000215 WO2020020476A1 (en) 2018-07-24 2019-07-12 Hybrid grease with low friction coefficients and high wearing protection

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FR3130837A1 (en) * 2021-12-21 2023-06-23 Nyco New polyalkoxysiloxane base oils for lubricating applications

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US4251431A (en) 1979-01-16 1981-02-17 Shell Oil Company Lubricating greases
JPH06240274A (en) * 1993-02-16 1994-08-30 Kyodo Yushi Kk Lubricant composition for ball joint
EP0657524B1 (en) 1993-12-01 1999-03-31 AUSIMONT S.p.A. Mineral or synthetic, hydrogen-based greases, having improved properties
DE19817055A1 (en) * 1997-06-20 1998-12-24 Fuchs Mineraloelwerke Lubricant for maintenance-free cardan shafts
JP2002180077A (en) * 2000-12-08 2002-06-26 Ntn Corp Lubricant composition and bearing
JP2003176489A (en) * 2001-10-04 2003-06-24 Nsk Ltd Traction grease composition
FR2906257A1 (en) * 2006-09-25 2008-03-28 Rhodia Recherches & Tech HIGH COHESION SILICONE GREASE WITH COLD
JP5388486B2 (en) * 2008-06-18 2014-01-15 トピー工業株式会社 Grease-like lubricant
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JP5731306B2 (en) 2011-07-21 2015-06-10 昭和シェル石油株式会社 Two-phase lubricating oil composition
JP5689088B2 (en) * 2012-03-23 2015-03-25 新日鐵住金株式会社 Lubricant composition for cold pilga rolling
WO2014028632A1 (en) 2012-08-14 2014-02-20 Dow Corning Corporation Lubricant compositions
GB2506974A (en) * 2012-08-14 2014-04-16 Dow Corning Lubricant compositions
JP6072532B2 (en) * 2012-12-21 2017-02-01 昭和シェル石油株式会社 Grease composition
CN105907446B (en) * 2016-04-20 2019-02-22 埃优诺特种新材料科技(山东)有限公司 Lubricant composition and preparation method thereof
JP6902233B2 (en) * 2016-12-06 2021-07-14 株式会社ニッペコ Grease composition and movable fitting

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KR20200079512A (en) 2020-07-03
EP3692120A1 (en) 2020-08-12
US11274263B2 (en) 2022-03-15
US20210171856A1 (en) 2021-06-10
KR102370955B1 (en) 2022-03-08
CN111770979A (en) 2020-10-13
JP7090711B2 (en) 2022-06-24
WO2020020476A1 (en) 2020-01-30

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