Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
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  • 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
  • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/08—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/04—Elements
  • C10M2201/041—Carbon; Graphite; Carbon black
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/06—Metal compounds
  • C10M2201/061—Carbides; Hydrides; Nitrides
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/06—Metal compounds
  • C10M2201/065—Sulfides; Selenides; Tellurides
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/06—Metal compounds
  • C10M2201/065—Sulfides; Selenides; Tellurides
  • C10M2201/066—Molybdenum sulfide
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/08—Inorganic acids or salts thereof
  • C10M2201/081—Inorganic acids or salts thereof containing halogen
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/08—Inorganic acids or salts thereof
  • C10M2201/084—Inorganic acids or salts thereof containing sulfur, selenium or tellurium
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/086—Chromium oxides, acids or salts
• • 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
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/10—Compounds containing silicon
  • C10M2201/102—Silicates
  • C10M2201/1023—Silicates used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/10—Compounds containing silicon
  • C10M2201/102—Silicates
  • C10M2201/103—Clays; Mica; Zeolites
• • 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
  • 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
• • 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
  • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
  • C10M2213/06—Perfluoro polymers
  • C10M2213/062—Polytetrafluoroethylene [PTFE]
• • 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
  • C10M2219/068—Thiocarbamate metal salts
• • 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
  • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
  • C10M2219/086—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing sulfur atoms bound to carbon atoms of six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/16—Groups 8, 9, or 10
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/055—Particles related characteristics
  • C10N2020/06—Particles of special shape or size
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/015—Dispersions of solid lubricants

Definitions

• the present invention relates to a lubricant additive and the use of certain metal sulfides for stabilizing a suspension of solid lubricants in a liquid lubricant.
• Lubricating oils are usually added to a solid lubricant additive in order to improve the tribological and wear-reducing properties of the lubricant, in particular under load (pressure and / or temperature).
• metal sulfides such as molybdenum disulfide, tin disulfide, bismuth trisulfide, antimony trisulfide, etc. are often used. There is extensive art which describes the use of such metal sulfides.
• the WO00 / 52116 describes a lubricant composition containing a layered lamellar solid lubricant such as tin disulfide and optionally other solid lubricants.
• the EP 244099 A describes solid lubricant additives for transmission oils such as molybdenum disulfide, graphite, tungsten disulfide, tin sulfide, polytetrafluoroethylene, etc.
• One of the most common lubricating additives which have so far been most frequently used, for example, in motor oils, essentially contains MoS 2 .
• the metal sulfides used as solid lubricants are present in suspension both in the additives and in the lubricating oils.
• the suspended metal sulfides often tend to agglomerate and settle, thereby affecting the effect of the metal sulfides and the properties of the lubricating oils.
• stabilizers eg anti-setting additives of elementis or dispersants based on calcium overbased. That's how it describes EP 244099 the use of an ethylene-propylene copolymer to control the dispersion and de-emulsification properties to improve a gear oil.
• the known dispersants are generally unable to sufficiently stabilize the suspension without at the same time affecting the lubricant properties.
• the present invention is therefore based on the object to provide a lubricant additive which is able to stabilize suspensions of solid lubricants based on sulfides without affecting the properties of the lubricants.
• Another object is to provide a low cost lubricant additive.
• activated graphite is a mixture of graphite and a metal compound selected from calcium fluoride, lithium fluoride, sodium aluminum fluoride (cryolite), potassium aluminum fluoride, potassium tetrafluoroborate (KBF 4 ), calcium sulfate, strontium sulfate, barium sulfate, magnesium carbonate, calcium carbonate, magnesium calcium carbonate (dolomite ), Lithium carbonate, lithium hydroxide, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, silica, titania, iron (II) iron (111) oxide (magnetite), and mixtures thereof.
• a metal compound selected from calcium fluoride, lithium fluoride, sodium aluminum fluoride (cryolite), potassium aluminum fluoride, potassium tetrafluoroborate (KBF 4 ), calcium sulfate, strontium sulfate, barium sulfate, magnesium carbonate, calcium carbonate, magnesium calcium carbonate (dolomite
• Activated graphite is prepared by mixing and / or grinding graphite with the mentioned compound, conveniently in a ball mill.
• the particle size of the graphite and the metal compound is in the range of 100 nm to 25 ⁇ m.
• activated graphite contains from 10 to 80% by weight, preferably from 30 to 70% by weight, in particular from 40 to 60% by weight of graphite and from 20 to 90% by weight, preferably from 30 to 70% by weight , in particular 40 to 60 wt .-% of the metal compound,
• the lubricant component a) may additionally contain one or more further lubricants.
• This may be a solid lubricant that is insoluble in the carrier oil, for example graphite, polytetrafluoroethylene or boron nitride or mixtures thereof.
• it may also be organic molybdenum compounds and the sulfurized derivatives thereof, as described in the US 5,641,731 are described act. Typical representatives of such compounds are molybdenum dithiophosphates and molybdenum dithiocarbamates.
• the molybdenum dithiocarbamates are preferably those of the formula (1) wherein R 1 and R 2 independently of one another are H or a hydrocarbon radical, where at least one of the radicals is a hydrocarbon radical, X is O or S, b is at least 2 and a is at least 1, depending on the oxidation state of the molybdenum, c in Depending on the oxidation state of the molybdenum is at least 1 and d is 0 or at least 1, depending on the oxidation state of the molybdenum.
• a and b are in the range of 1 to 5
• c is in the range of 1 to 6
• d is generally 0 or in the range of 2 to 10.
• a is 1 or 2
• b is 1 or 2
• c for 1 or 2
• d for 0 or 2.
• the hydrocarbon radicals comprise in particular 3 to 26 carbon atoms and more preferably 4 to 18 carbon atoms. They may be aliphatic radicals, such as alkyl or alkenyl groups, alicyclic radicals, such as cycloalkyl or cycloalkenyl groups, aromatic radicals, such as phenyl or naphthyl groups, which may optionally be substituted. Suitable substituents for the aliphatic radicals are halogen, in particular chlorine or fluorine, amino, C 1 -C 12 -alkoxy, mercapto, C 1 -C 12 -alkylmercapto, etc. Suitable substituents for alicyclic radicals are the abovementioned substituents and also phenyl. Suitable substituents for aromatic radicals are, in particular, alkyl radicals having preferably 1 to 12 carbon atoms.
• molybdenum dithiocarbamates of the formulas are used: wherein a is at least 2 and R 1 , R 2 and X have the meanings given above.
• R 2 is hydrogen and X is S.
• the molybdenum is preferably present at the oxidation state +5 or +6.
• Examples of molybdenum dithiocarbamates are molybdenum di-n-butyl dithiocarbamate, which is commercially available under the name Molyvan A from Vanderbilt, and molybdenum ditridecyldithiocarbamate, which is commercially available under the name Molyvan 807 from Vanderbilt.
• Molybdenum dithiocarbamates and their preparation are for example in the US 4,846,983 to which reference is made in its entirety.
• Molybdenum dithiophosphates and their preparation are for example in the US 5,055,174 to which reference is made in its entirety.
• the lubricant component a) contains an additional solid lubricant, this is generally present in a proportion of 1 to 70 wt .-%, preferably 5 to 65 wt .-%, in particular 10 to 60 wt .-%, 20 to 60 wt. % and more preferably 30 to 60 wt .-%, based on the total weight of the lubricant component.
• the oil-soluble lubricants are generally contained in an amount of 0.1 to 10 wt .-%, in particular 0.1-5 wt .-%, based on the total weight of the lubricant component.
• the lubricant additive contains 5 to 30 wt .-%, in particular 10 to 20 wt .-% of the lubricant component a).
• component b) molybdenum disulfide or copper sulfide and in particular molybdenum disulfide.
• the weight ratio of component a) to component b) is generally in the range from 2.5: 1 to 100: 1, preferably 3: 1 to 50: 1, in particular 4: 1 to 30: 1 and particularly preferably 4: 1 to 15: 1.
• the particle size of component a) is in the range of 100 nm to 25 .mu.m, in particular 100 nm to 10 .mu.m (determined by means of laser diffraction with a Malvern device: Mastersizer S "particle size distribution by laser diffraction").
• the particle size of component b) is preferably in the range of 10 nm to 1 ⁇ m (determined by means of laser diffraction, as mentioned above).
• the particle size of the components a) and b) is chosen so that the particle size of component b) is equal to or preferably lower than that of component a).
• the difference in the particle size is preferably at least the factor 10, in particular at least the factor 20 and particularly preferably at least the factor 40.
• component a) comprises graphite as further solid lubricant.
• component a) comprises a mixture of tin disulfide, bismuth III sulfide and graphite.
• component a) comprises 30 to 60 wt .-% graphite, 15 to 35 wt .-% tin disulfide and 15 to 40 wt .-% bismuth III sulfide, wherein the weight fractions are based on the total weight of these components, and supplement to 100%.
• component a) comprises activated graphite and an organic molybdenum compound. More preferably, component a) comprises 92 to 99.9 wt .-%, preferably 94 to 99.5 wt .-% of activated graphite and 0.1 to 8 wt .-%, preferably 0.5 to 6 wt .-% of the organic molybdenum compound.
• the lubricant additive of the invention may optionally contain other conventional components.
• such components are binders or thickeners, as indicated below in connection with the lubricants to which the lubricant additives are added, or fillers, such as oxides, hydroxides, carbonates, sulfates, thiosulfates, phosphates, silicates and halides of metal compounds.
• fillers are calcium carbonate, magnesium carbonate, alumina, silica, calcium hydroxide, calcium phosphate, calcium sulfate, barium sulfate, zeolites, and calcium fluoride.
• the lubricant additives according to the invention may also contain organic fillers, in particular polymers, such as PTFE, polyethylene or aramid powder (eg Twaron® 5011 from Teijin Twaron) and cellulose fibers (eg Arbocel® from Rettenmaier or Setralit® NfU / 346/1 from ECCO).
• organic fillers in particular polymers, such as PTFE, polyethylene or aramid powder (eg Twaron® 5011 from Teijin Twaron) and cellulose fibers (eg Arbocel® from Rettenmaier or Setralit® NfU / 346/1 from ECCO).
• the carrier oil for the lubricant additives of the present invention all oils usually used for lubricants are usable (examples of which are given below in connection with the lubricants to which the lubricant additives are added). It is expedient to use those carrier oils whose viscosity at 40 ° C. is 100 to 1500 cSt (100 to 1500 mm 2 / s).
• the carrier oil used is preferably paraffinic or naphthenic carrier oils, such as T110 from Nynas, SN 100 from Shell or NS 500 from Total.
• the preparation of the lubricant additives according to the invention is carried out in a customary manner by mixing the components using conventional devices known to the person skilled in the art, for example a dispersing device such as the Ultra-Turrax or a grinding system from Lehmann.
• a dispersing device such as the Ultra-Turrax or a grinding system from Lehmann.
• Useful polyolefin oils are, in particular, polymers of C 8 -C 12 - ⁇ -olefins.
• Polyether oils include aliphatic polyether oils such as poly (alkylene glycols), e.g. As polyethylene glycol, poly (propylene glycol) and copolymers thereof and the mono- and diethers, mono- or diesters and desired ether esters thereof. There are water-soluble and water-insoluble types into consideration. Aliphatic polyether oils also include perfluoropolyalkyl ethers. Preferred polyether oils are polyphenyl ethers and alkylated polyphenyl ethers.
• Branched primary alcohols are, in particular, the alcohols obtained by oxosynthesis or aldol condensation, such as 2-ethylhexanol and the C 7 , C 8 and C 9 oxo alcohols.
• Sebacin, azelaic and adipic acid are particularly preferred as the dicarboxylic acid.
• poly (alkylene glycol) poly (ethylene glycol) having a molecular weight of 100 to 600 is preferred.
• esters of neopentyl polyols are, in particular, esters of neopentyl glycol, trimethylolethane, trimethylolpropane, pentaerythritol and the ethoxylated and / or propoxylated products thereof.
• Preference according to the invention is given to mineral oils, ester oils and polyether oils.
• liquid lubricants examples include engine oils, gear oils, turbine oils, hydraulic fluids, pump oils, heat transfer agents, insulating oils, Drilling oils, cutting oils, compressor oils, chain oils, glass machine oils, release oils, gun oils, cylinder oils, solvent or water based bonded coatings (before the evaporation of the carrier liquid), cooling lubricants, etc.
• Semi-solid lubricant compositions of the present invention are generally based on mineral or synthetic oils (as noted above) in conjunction with suitable thickening agents.
• suitable thickening agents are fats, pastes, carriage greases, rolling and plain bearing greases etc.
• the lubricant additive according to the invention is generally added to the lubricants in an amount of from 0.1 to 5% by weight, preferably from 0.2 to 3% by weight and in particular from 0.5 to 1% by weight, based on the weight of the lubricant , added.
• the addition of the lubricant additive may also be such that components a) or b) are added separately to the lubricant.
• the lubricant additives according to the invention bring about an improvement in the suspension stability of the solid lubricants suspended in the lubricants, so that the tribological and wear-reducing properties of the lubricants are not impaired.
• the lubricant additives themselves form a stable suspension, so that the risk of uneven dosage or the introduction of agglomerates is reduced in the lubricant.
• low-cost lubricant additives can be formulated, in particular those with a low proportion of molybdenum disulfide.
• a gel of thickener and carrier oil was first prepared by mixing with an Ultra-Turrax. Subsequently, the remaining components were added and the mixture was ground in a porcelain ball mill (laboratory plant, Retsch) for 24 hours.
• a lubricant additive B which additionally contained 1.5 g of molybdenum disulfide (component b) as a 30% MoS 2 solid suspension from Acheson: SLA 1286
• a lubricant additive C which additionally contained 3.0 g of molybdenum disulfide (component b) as a 30% MoS 2 solid suspension from Acheson: SLA 1286), prepared by reacting 95 g of component a) with 5 g of the MoS 2 suspension or 90 g of component a) were mixed with 10 g of MoS 2 suspension.
• the lubricant additives A, B and C were then added to two commercially available motor oils from Meguin and the settling behavior of the resulting lubricants was investigated.
• 0.35 g of the lubricant additive and 49.65 g of engine oil were first mixed with a spatula and then for 15 minutes with a magnetic stirrer. The mixture was placed in a 50 ml graduated cylinder and after 14, 21 and 35 days the settling behavior was determined by the volume of the supernatant clear oil fraction. The higher the oil content in ml, the worse the settling behavior. The maximum, with complete settling the solids content of the suspension is 49.5 ml.
• Table 1 The results are summarized in Table 1 below.
• the lubricant additives B and C according to the invention bring about a marked improvement in the settling behavior of the solids, ie. H. the stability of the suspension is improved.
• a lubricant additive E which additionally contained 1.5 g of molybdenum disulfide (component b) as a 30% MoS 2 solid suspension from Acheson: SLA 1286
• a lubricant additive F which additionally contained 3.0 g of molybdenum disulfide (component b) as a 30% MoS 2 solid suspension from Acheson: SLA 1286), as described in Example 1.
• the lubricant additives E and F according to the invention bring about a marked improvement in the settling behavior of the solids, ie. H. the stability of the suspension is improved.
• lubricant additives G, H and I indicated with the same composition as in Example 2 and prepared according to the procedure described in Example 1, with the difference that instead of bentonite attapulgite (Attagel ® 40, Engelhard) was used as the thickener.
• the lubricant additives H and I according to the invention bring about a marked improvement in the settling behavior of the solids, i. the stability of the suspension is improved.
• the wear behavior of the engine oil Meguin 5810 B was investigated with and without the addition of a lubricant additive under load.
• the tester used was a fretting tester based on the principle of the Reicher test machine.
• a rotating cylinder dips into the lubricant, which has a temperature of 20 ° C.
• the ring is then gradually loaded by pressing the lateral surface of a fixed smaller cylinder, which is arranged so that its longitudinal axis is perpendicular to the longitudinal axis of the larger cylinder, and the wear dome of the stationary ring is measured as a function of the load in mm 2 .
• the wear behavior was determined under pressure in increments of 500 N up to 2500 N (1500 rpm, 6 min).
• the engine oil 5810 B was determined alone and with the addition of the lubricant additives B, C, F and I.
• the wear behavior of Meguin 5810 B with the addition of 0.35% molybdenum disulfide suspension (30% MoS 2 solid suspension from Acheson: SLA 1286) was determined. The results are summarized in Table 4 below.
• the lubricant additives B, C, F and I according to the invention do not adversely affect the wear behavior of the engine oil. At all load levels even an improvement of the wear behavior can be observed. Although at the same solids content of the molybdenum disulfide content of the additive according to the invention by a factor of 5 to 10 is lower than when using MoS 2 alone (last column), the wear behavior is comparable. Since the other additive components are less expensive than molybdenum disulfide, the task of finding an economical alternative to a pure MoS 2 additive is also solved.

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• Lubricants (AREA)

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• 2007
  • 2007-02-27 EP EP07103161A patent/EP1967572A1/fr not_active Withdrawn

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