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
  • 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/02—Well-defined aliphatic compounds
  • C10M2203/024—Well-defined aliphatic compounds unsaturated
• • 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
  • 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
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions 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
  • 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
  • C10M2205/028—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
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/08—Amides
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/08—Amides
  • C10M2215/082—Amides containing hydroxyl groups; Alkoxylated derivatives
• • 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
  • 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
  • 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
  • C10M2223/047—Thioderivatives not containing metallic elements
• • 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
  • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
  • C10M2227/09—Complexes with metals
• • 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
  • C10N2010/12—Groups 6 or 16
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/54—Fuel economy
• • 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
  • C10N2070/00—Specific manufacturing methods for lubricant compositions
  • C10N2070/02—Concentrating of additives

Definitions

• the present invention is applicable to the field of lubricants, in particular lubricants for engine, and more particularly for engine of motor vehicles. More particularly, the present invention relates to a lubricating composition comprising at least one base oil, at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine.
• the lubricant composition according to the invention has both good friction properties for steel / steel contacts, for steel / carbon coating contacts as well as for carbon coating / carbon coating contacts, while retaining good anti-wear properties. .
• the present invention also relates to a lubrication process using this composition.
• the present invention also relates to a method for reducing friction between two steel surfaces, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to a method for reducing friction between a steel surface and a surface covered with carbon, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to a method for reducing friction between two carbon-coated surfaces, and more particularly in a motor vehicle engine.
• the present invention also relates to a method for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.
• the present invention also relates to the use of a fatty triamine in a lubricating composition to reduce friction between two steel surfaces, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to the use of a fatty triamine in a lubricating composition to reduce friction between a steel surface and a surface covered with carbon, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to the use of an oily triamine in a lubricating composition to reduce friction between two surfaces covered with carbon, in particular in an engine, and more particularly in an engine of motor vehicles.
• the present invention also relates to the use of a fatty triamine in a lubricating composition for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.
• the present invention also relates to a concentrated composition type of additives comprising at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine.
• lubricants are to reduce the friction and wear phenomena of mechanical parts, in particular in vehicle engines, and more particularly in motor vehicles.
• organomolybdenum compounds represent a family of compounds whose properties for reducing friction phenomena have been widely described, and more particularly in the contacts between two steel surfaces.
• organomolybdenum compounds in particular organomolybdenum compounds comprising a dithiocarbamate group, can cause aggravation of the phenomena of wear of mechanical parts.
• the document US 5,650,381 describes in particular a lubricating composition comprising an organomolybdenum compound and a zinc dithiophosphate.
• DLC coatings are used as coatings on the surfaces of parts in vehicle engines, and in particular in motor vehicle engines.
• organomolybdenum compounds present in a lubricant can degrade or even peel off a carbon coating present on a surface and that this degradation can be accentuated with the increase in the content of organomolybdenum compounds in the lubricant.
• lubricants compatible with surfaces covered with a carbon material, and in particular a DLC coating or a nanodiamond coating have been sought, these lubricants not comprising organolmolybdenum compounds.
• the document EP 2479247 describes a lubricant comprising a compound based on a zinc phosphate compound and a sulfur compound.
• the document EP 1338641 describes a lubricant comprising an amine as a friction modifier compatible with a surface having a DLC coating.
• An objective of the present invention is to provide a lubricating composition which overcomes all or part of the aforementioned drawbacks.
• Another objective of the invention is to provide a lubricating composition the formulation of which is easy to use.
• Another object of the present invention is to provide a lubrication method for reducing friction between two steel surfaces, between a steel surface and a carbon coated surface as well as between two carbon coated surfaces.
• the Applicant has found that the presence of at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine in a lubricating composition makes it possible to confer on the lubricating composition simultaneously good friction properties for steel / steel contacts, for steel / carbon coating contacts and for carbon coating / carbon coating contacts.
• the present invention makes it possible to formulate lubricant compositions comprising an optimized content of organomolybdenum compounds and having good friction properties for steel / steel contacts, for steel / carbon coating contacts as well as for carbon coating / carbon coating contacts.
• the lubricant compositions according to the invention have good friction properties for steel / steel contacts, for steel / carbon coating contacts and for carbon coating / carbon coating contacts, while retaining good anti-wear properties.
• the lubricant compositions according to the invention allow fuel savings in all the operating phases of an engine. vehicle, preferably motor vehicles, and more particularly at start-up.
• the lubricant compositions according to the invention exhibit good storage stability as well as a viscosity which does not vary or varies very little.
• the invention also relates to a motor oil comprising a lubricating composition as defined above.
• the invention also relates to the use of a lubricating composition as defined above for the lubrication of mechanical parts, in particular in transmissions and / or vehicle engines, preferably motor vehicles.
• the invention also relates to the use of a lubricating composition as defined above for reducing friction between two steel surfaces, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a lubricant composition above to reduce friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a lubricating composition as defined above for reducing friction between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a lubricating composition as defined above for reducing the fuel consumption of vehicles, preferably motor vehicles.
• the invention also relates to a method of lubricating mechanical parts, in particular in transmissions and / or engines of vehicles, preferably motor vehicles, comprising at least one step of bringing at least one part into contact with a lubricating composition such as defined above.
• the invention also relates to a method for reducing friction between two steel surfaces, in particular in a vehicle engine, preferably of a motor vehicle, comprising at least one step of bringing at least one of the steel surfaces into contact with a composition.
• lubricant as defined above.
• the invention also relates to a method for reducing friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle, comprising at least one step of bringing at least one of the surfaces with a lubricating composition as defined above.
• the invention also relates to a method for reducing the friction between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle, comprising at least one step of bringing at least one of the surfaces covered with carbon into contact with a lubricating composition as defined above.
• the invention also relates to a method for reducing the fuel consumption of a vehicle, preferably a motor vehicle, comprising at least one step of bringing a mechanical part of the engine of the vehicle into contact with a lubricating composition as defined above.
• the invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two steel surfaces, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a fatty triamine in a lubricating composition
• a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two carbon-coated surfaces, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing the fuel consumption of a vehicle, preferably a motor vehicle.
• the lubricant composition according to the invention comprises at least one organomolybdenum compound.
• organomolybdenum compound according to the invention is meant any organomolybdenum compound soluble in an oil.
• the organomolybdenum compound can be chosen from organic molybdenum complexes such as carboxylates, esters, molybdenum amides, which can be obtained by reaction of molybdenum oxide or molybdates of ammonium with fatty substances, glycerides, fatty acids or derivatives of fatty acids (esters, amines, amides ).
• organic molybdenum complexes such as carboxylates, esters, molybdenum amides, which can be obtained by reaction of molybdenum oxide or molybdates of ammonium with fatty substances, glycerides, fatty acids or derivatives of fatty acids (esters, amines, amides ).
• the organomolybdenum compound is chosen from molybdenum complexes free from sulfur and phosphorus, with ligands of amide type, mainly prepared by reaction of a source of molybdenum, which can be by example molybdenum trioxide, and an amine derivative, and fatty acids comprising for example from 4 to 28 carbon atoms, preferably from 8 to 18 carbon atoms, such as for example the fatty acids contained in vegetable or animal oils.
• a source of molybdenum which can be by example molybdenum trioxide, and an amine derivative
• fatty acids comprising for example from 4 to 28 carbon atoms, preferably from 8 to 18 carbon atoms, such as for example the fatty acids contained in vegetable or animal oils.
• the organic molybdenum complex can comprise from 2 to 8.5% by weight of molybdenum relative to the weight of complex.
• the organic molybdenum complex consists of at least one compound of formula (Ia) or (II-a), alone or as a mixture: in which R 1 represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms, in which R 1 represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms.
• the organomolybdenum compound can be chosen from molybdenum dithiophosphates or molybdenum dithiocarbamates.
• the organomolybdenum compound is chosen from molybdenum dithiocarbamates.
• Molybdenum dithiocarbamate compounds are complexes formed from a metal nucleus linked to one or more ligands, the ligand being an alkyl dithiocarbamate group. These compounds are well known to those skilled in the art.
• the Mo-DTC compound can comprise from 1 to 40%, preferably from 2 to 30%, more preferably from 3 to 28%, advantageously from 4 to 15% by mass of molybdenum, based on the total mass of the Mo-DTC compound.
• the Mo-DTC compound can comprise from 1 to 40%, preferably from 2 to 30%, more preferably from 3 to 28%, advantageously from 4 to 15% by mass of sulfur , based on the total mass of the Mo-DTC compound.
• the compound Mo-DTC can be chosen from those whose nucleus has two molybdenum atoms (also called dimeric Mo-DTC) and those whose nucleus has three molybdenum atoms (also called Mo-DTC trimer).
• trimeric Mo-DTC compounds As examples of trimeric Mo-DTC compounds according to the invention, mention may be made of the compounds and their methods of preparation as described in the documents WO 98/26030 and US 2003/022954 .
• the Mo-DTC compound is a dimeric Mo-DTC compound.
• dimeric Mo-DTC compounds mention may be made of the compounds and their methods of preparation as described in the documents EP 0757093 , EP 0719851 , EP 0743354 or EP 1013749 .
• alkyl group within the meaning of the invention means a hydrocarbon group, linear or branched, saturated or unsaturated, comprising from 1 to 24 carbon atoms.
• the alkyl group is chosen from the group formed by methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, l hexadecyl, stearyl, icosyl, docosyl, tetracosyl, triacontyl, 2-ethylhexyl, 2-butyloctyl, 2-butyldecyl, 2-hexyloctyl, 2-hexyldecyl, 2-octyldecyl, 2-hexyldodecyl , 2-
• alkenyl group within the meaning of the present invention means a linear or branched hydrocarbon group comprising at least one double bond and comprising from 2 to 24 carbon atoms.
• the alkenyl group can be chosen from vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, l 'undecenyl, dodecenyl, tetradecenyl and oleic.
• aryl group within the meaning of the present invention, is meant a polycyclic aromatic hydrocarbon or an aromatic group, substituted or not by an alkyl group.
• the aryl group can comprise from 6 to 24 carbon atoms.
• the aryl group can be chosen from the group formed by phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, phenylphenyl, benzylphenyl, phenylphenyl, phenyl
• the cycloalkyl groups and the cycloalkenyl groups can be chosen, without limitation, from the group consisting of cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclopentenyl, methylcyclohexenyl.
• Cycloalkyl groups and cycloalkenyl groups can have from 3 to 24 carbon atoms.
• R 3 , R 4 , R 5 and R 6 independently represent an alkyl group comprising from 4 to 18 carbon atoms or an alkenyl group comprising from 2 to 24 carbon atoms.
• X 3 , X 4 , X 5 and X 6 may be identical and may represent a sulfur atom.
• X 3 , X 4 , X 5 and X 6 can be identical and can be an oxygen atom.
• X 3 and X 4 may represent a sulfur atom and X 5 and X 6 may represent an oxygen atom.
• X 3 and X 4 can represent an oxygen atom and X 5 and X 6 can represent a sulfur atom.
• the ratio in number of sulfur atoms relative to the number of oxygen atoms (S / O) of the Mo-DTC compound can vary from (1/3) to (3/1).
• the Mo-DTC compound of formula (A) can be chosen from a symmetrical Mo-DTC compound, an asymmetric Mo-DTC compound and their combination.
• symmetrical Mo-DTC compound according to the invention is meant a Mo-DTC compound of formula (III) in which the groups R 3 , R 4 , R 5 and R 6 are identical.
• asymmetric Mo-DTC compound according to the invention means a Mo-DTC compound of formula (III) in which the groups R 3 and R 4 are identical, the groups R 5 and R 6 are identical and the groups R 3 and R 4 are different from the groups R 5 and R 6 .
• the Mo-DTC compound is a mixture of at least one symmetrical Mo-DTC compound and at least one asymmetric Mo-DTC compound.
• R 3 and R 4 represent an alkyl group comprising from 5 to 15 carbon atoms and R 5 and R 6 , identical and different from R 3 and R 4 , represent a group alkyl comprising from 5 to 15 carbon atoms.
• R 3 and R 4 which are identical, represent an alkyl group comprising from 6 to 10 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 10 to 15 carbon atoms.
• R 3 and R 4 which are identical, represent an alkyl group comprising from 10 to 15 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 6 to 10 carbon atoms .
• R 3 , R 4 , R 5 and R 6 which are identical, represent an alkyl group comprising from 5 to 15 carbon atoms, preferably from 8 to 13 carbon atoms.
• the compound Mo-DTC is chosen from the compounds of formula (III-a) in which the groups R 3 , R 4 , R 5 and R 6 are as defined for formula (III).
• Mo-DTC compounds As examples of Mo-DTC compounds, mention may be made of the products Molyvan L, Molyvan 807 or Molyvan 822 sold by the company RT Vanderbilt Compagny or the products Sakura-lube 200, Sakura-lube 165, Sakura-lube 525 or Sakura-lube 600 marketed by the company Adeka.
• the content by weight of organomolybdenum compound ranges from 0.05 to 3%, preferably from 0.1 to 2%, advantageously from 0.1 to 1% relative to the total weight of the lubricating composition.
• the lubricant composition according to the invention comprises at least one compound comprising a dithiophosphate group.
• dithiophosphate the compound comprising a dithiophosphate group
• dithiophosphate the compound comprising a dithiophosphate group
• the dithiophosphate can be chosen from ammonium dithiophosphates, amine dithiophosphates, ester dithiophosphates and metallic dithiophosphates, taken alone or as a mixture.
• the dithiophosphate is chosen from ammonium dithiophosphates of formula (IV): in which R 7 and R 8 represent, independently of one another, an optionally substituted hydrocarbon group comprising from 1 to 30 carbon atoms.
• R 7 and R 8 represent, independently of one another, an optionally substituted hydrocarbon group, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• R 7 and R 8 represent, independently of one another, an unsubstituted hydrocarbon group, said hydrocarbon group possibly being an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 7 and R 8 represent, independently of one another, a linear or branched alkyl hydrocarbon group, more preferably a linear alkyl hydrocarbon group.
• R 7 and R 8 independently of one another represent a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.
• ammonium dithiophosphate mention may be made of ammonium dimethyl dithiophosphates, ammonium diethyl dithiophosphates and ammonium dibutyl dithiophosphates.
• R 9 and R 10 independently of one another represent an optionally substituted hydrocarbon group comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , advantageously from 5 to 12 carbon atoms.
• R 9 and R 10 represent, independently of one another, an unsubstituted hydrocarbon group, said hydrocarbon group possibly being an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 9 and R 10 represent, independently of one another, a linear or branched alkyl hydrocarbon group, more preferably a linear alkyl hydrocarbon group.
• R 9 and R 10 independently of one another represent a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.
• R 11 , R 12 and R 13 independently of one another represent a hydrocarbon group comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , advantageously from 5 to 12 carbon atoms.
• R 14 and R 15 independently of one another represent an optionally substituted hydrocarbon group comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , advantageously from 5 to 12 carbon atoms.
• R 14 and R 15 independently of one another represent an unsubstituted hydrocarbon group, said hydrocarbon group possibly being an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 14 and R 15 represent, independently of one another, a linear or branched alkyl hydrocarbon group, more preferably a linear alkyl hydrocarbon group.
• R 14 and R 15 represent, independently of one another, a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.
• R 14 and R 15 represent, independently of one another, a hydrocarbon group comprising from 2 to 6 carbon atoms.
• R 16 and R 17 represent, independently of one another, a hydrocarbon group comprising from 2 to 6 carbon atoms.
• the metal is chosen from the group consisting of zinc, aluminum, copper, iron, mercury, silver, cadmium, tin, lead, antimony, bismuth, thallium, chromium, molybdenum, cobalt, nickel, tungsten, sodium, calcium, magnesium, manganese and arsenic.
• the preferred metals are zinc, molybdenum, antimony, preferably zinc and molybdenum.
• the metal is zinc.
• the metallic dithiophosphates are neutral as exemplified in formula (VII) or basic when a stoichiometric excess of metal is present.
• R 18 and R 19 independently of one another represent a hydrocarbon group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , advantageously from 5 to 12 carbon atoms.
• R 18 and R 19 represent, independently of one another, an unsubstituted hydrocarbon group, said hydrocarbon group possibly being an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 18 and R 19 represent, independently of one another, a linear or branched alkyl hydrocarbon group, more preferably a linear alkyl hydrocarbon group.
• R 18 and R 19 independently of one another represent a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.
• the dithiophosphate according to the invention is a zinc dithiophosphate of formula (VII-a) or of formula (VII-b): in which R 18 and R 19 are as defined above.
• metallic dithiophosphate there may be mentioned for example the Additin® RC 3038, the Addin® RC 3045, the Addin® RC 3048, the Addin® RC 3058, the Addin® RC 3080, Addin® RC 3180, Addin® RC 3212, Addin® RC 3580, Kikulube® Z112, Lubrizol® 1371, Lubrizol® 1375, Lubrizol® 1395, Lubrizol® 5179, Oloa® 260, Olaa® 267.
• the content by weight of dithiophosphate ranges from 0.1 to 5%, preferably from 0.1 to 3%, advantageously from 0.5 to 2% relative to the total weight of the lubricating composition.
• the lubricant composition according to the invention comprises at least one fatty triamine.
• the fatty triamines are mainly obtained from carboxylic acids.
• the starting fatty acids for obtaining fatty triamines according to the invention can be chosen from myristic, pentadecylic, palmitic, margaric, stearic, nonadecylic, arachidic, heneicosanoic, behenic, tricosanoic, lignoceric, pentacosanoic, cerotic, heptacosanoic, montanic acids.
• nonacosanoic nonacosanoic, melissic, hentriacontanoic, laceroic or unsaturated fatty acids such as palmitoleic, oleic, erucic, nervonic, linoleic, a-linolenic, gamma-linolenic, di-homo-gamma-linolenic, arachidonic, eicosapentaenoic, docosahexaenoic.
• unsaturated fatty acids such as palmitoleic, oleic, erucic, nervonic, linoleic, a-linolenic, gamma-linolenic, di-homo-gamma-linolenic, arachidonic, eicosapentaenoic, docosahexaenoic.
• the preferred fatty acids can be derived from the hydrolysis of the triglycerides present in vegetable and animal oils, such as coconut oil, palm oil, olive oil, peanut oil, rapeseed oil, sunflower oil, soybean oil, cotton, linen, beef tallow, ....
• Natural oils may have been genetically modified to enrich their content of certain fatty acids.
• the fatty triamines can be obtained from natural, plant or animal resources.
• the fatty triamine is chosen from the compounds of formula (VIII): R 20 -N - [(CH 2 ) 3 -NH 2 ] 2 (VIII) in which R 20 represents a linear or branched, saturated or unsaturated alkyl group comprising at least 10 carbon atoms, preferably from 10 to 22 carbon atoms, more preferably from 14 to 22 carbon atoms, advantageously from 16 to 20 carbon atoms .
• R 20 represents a mixture of at least one saturated alkyl group comprising from 16 to 18 carbon atoms and a mono-unsaturated alkyl group comprising from 16 to 18 carbon atoms.
• the fatty triamine is chosen from the compounds of formula (IX): R 21 -NH- (CH 2 -CH 2 -CH 2 -NH) 2 -H (IX) in which R 21 represents a linear or branched, saturated or unsaturated alkyl group comprising at least 10 carbon atoms, preferably from 10 to 22 carbon atoms, more preferably from 14 to 22 carbon atoms, advantageously from 16 to 20 carbon atoms .
• the content by weight of fatty triamine ranges from 0.1 to 5%, preferably from 0.1 to 3%, advantageously from 0.5 to 2% relative to the total weight of the composition.
• the lubricating composition comprises a mass ratio (organomolybdenum / fatty triamine compound) ranging from 1/10 to 1, preferably from 1/5 to 4/5.
• the lubricating composition comprises a mass ratio (organomolybdenum compound / compound comprising a dithiophosphate / fatty triamine group) ranging from 1/10/10 to 1/1/1, preferably ranging from 1 / 5/5 to 4/5/5.
• the lubricating compositions according to the invention may contain any type of mineral, synthetic or natural, animal or vegetable lubricating base oil suitable for their use.
• the base oil or oils used in the lubricating compositions according to the present invention may be oils of mineral or synthetic origin from groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) as summarized below, alone or in mixture.
• Table I Saturated content Sulfur content Viscosity index (VI) Group I Mineral oils ⁇ 90% > 0.03% 80 ⁇ VI ⁇ 120 Group II Hydrocracked oils ⁇ 90% ⁇ 0.03% 80 ⁇ VI ⁇ 120 Group III Hydrocracked or hydro-isomerized oils ⁇ 90% ⁇ 0.03% ⁇ 120 Group IV Polyalphaolefins (PAO) Group V Esters and other bases not included in groups I to IV bases
• the mineral base oils according to the invention include all types of bases obtained by atmospheric distillation and under vacuum of crude petroleum, followed by refining operations such as solvent extraction, dealphating, solvent dewaxing, hydrotreatment, hydrocracking and hydroisomerization, hydrofinishing.
• the base oils of the lubricating compositions according to the invention can also be synthetic oils, such as certain esters of carboxylic acids and alcohols, or polyalphaolefins.
• the polyalphaolefins used as base oils are for example obtained from monomers having from 4 to 32 carbon atoms (for example octene, decene), and a viscosity at 100 ° C of between 1.5 and 15 cSt according to the standard ASTM D445.
• Their weight average molecular weight is typically between 250 and 3000 according to standard ASTM D5296. Mixtures of synthetic and mineral oils can also be used.
• a lubricating base for producing the lubricating compositions according to the invention, except that they must have properties, in particular of viscosity, viscosity index, content of sulfur, oxidation resistance, suitable for use in a vehicle engine, preferably motor vehicles.
• the lubricating bases represent at least 50% by mass, relative to the total mass of the lubricating composition, preferably at least 60%, or even at least 70%. Typically, they represent between 75 and 99.9% by mass, relative to the total mass of the lubricant compositions according to the invention.
• the lubricating compositions comprise group I and / or III mineral bases, or group IV synthetic bases according to the API classification.
• the lubricant compositions have a kinematic viscosity at 100 ° C. measured according to standard ASTM D445 ranging from 4 to 25 cSt, preferably from 5 to 22 cSt, advantageously from 5 to 13 cSt .
• the lubricant compositions have a viscosity index (VI) greater than or equal to 140, preferably greater than or equal to 150, measured according to standard ASTM 2270.
• VI viscosity index
• the lubricant compositions according to the invention may also contain at least one additive chosen from detergents, anti-wear additives other than a dithiophosphate, extreme pressure additives, dispersants, pour point improvers, anti - foam, thickeners and their mixtures.
• the lubricant composition can further comprise at least one antioxidant additive.
• the antioxidant additives delay the degradation of the lubricating compositions in service, in particular of engine oils in service, degradation which can in particular result in the formation of deposits, the presence of sludge, or an increase in the viscosity of the lubricating composition, in particular of the engine oil.
• the antioxidant additives act in particular as radical inhibitors or destroyers of hydroperoxides.
• antioxidants commonly used there may be mentioned antioxidants of phenolic type or of amino type, phosphosulfur antioxidants. Some of these antioxidants, for example phosphosulfurics, can generate ash.
• the phenolic antioxidants can be ashless, or they can be in the form of neutral or basic metal salts.
• the antioxidant agents can be chosen in particular from sterically hindered phenols, sterically hindered phenol esters and sterically hindered phenols comprising a thioether bridge, diphenylamines, diphenylamines substituted by at least one C1-C12 alkyl group, N, N 'dialkyl aryl diamines and combinations thereof.
• sterically hindered phenol is meant within the meaning of the present invention a compound comprising a phenol group in which at least one vicinal carbon of the carbon carrying the alcohol function is substituted by at least one C1-C10 alkyl group, preferably a C1-C6 alkyl group, preferably a C4 alkyl group, preferably by the ter-butyl group.
• Amino compounds are another class of antioxidants that can be used, possibly in combination with phenolic antioxidants.
• Typical examples are the aromatic amines, of formula R 22 R 23 R 24 N, in which R 22 represents an aliphatic group or an optionally substituted aromatic group, R 23 represents an optionally substituted aromatic group, R 24 represents a hydrogen atom , an alkyl group, an aryl group or a group of formula R 25 S (O) z R 26 , where R 25 represents an alkylene group or an alkenylene group, R 26 represents an alkyl group, an alkenyl group or an aryl group and z represents an integer of 0, 1 or 2.
• Sulfurized alkyl phenols or their alkali and alkaline earth metal salts can also be used as antioxidants.
• antioxidants are that of copper-containing compounds, for example copper thio- or dithiophosphates, copper and carboxylic acid salts, dithiocarbamates, sulphonates, phenates, copper acetylacetonates.
• copper I and II salts, succinic acid or anhydride can also be used.
• the lubricant composition according to the invention can contain any type of antioxidant additive known to those skilled in the art.
• ashless antioxidants are used.
• the lubricant composition according to the invention can comprise from 0.5 to 2% of at least one antioxidant additive by weight relative to the total mass of the lubricant composition.
• the lubricant composition according to the invention can also comprise a detergent additive.
• Detergent additives in particular reduce the formation of deposits on the surface of metal parts by dissolving secondary oxidation and combustion products.
• the detergents which can be used in the lubricant composition according to the invention are well known to those skilled in the art.
• the detergents commonly used in the formulation of lubricating compositions can be anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head.
• the associated cation is typically a metal cation of an alkali or alkaline earth metal.
• the detergents are preferably chosen from the alkali or alkaline earth metal salts of carboxylic acids, sulfonates, salicylates, naphthenates, as well as the phenate salts.
• the alkali and alkaline earth metals are preferably calcium, magnesium, sodium or barium. These metal salts may contain the metal in an approximately stoichiometric amount or in excess (in an amount greater than the stoichiometric amount). In the latter case, these detergents are said to be overbased detergents.
• the excess metal bringing the overbased character to the detergent, is in the form of metal salts insoluble in oil, for example carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate.
• the lubricant composition according to the invention can comprise from 2 to 4% by weight of detergent, relative to the total mass of the lubricant composition.
• the lubricant composition according to the invention can also comprise at least one pour point lowering additive.
• Pour point lowering additives notably improve the cold behavior of lubricating compositions, by slowing down the formation of paraffin crystals.
• the lubricant composition according to the invention can also comprise at least one dispersant.
• the dispersants can be chosen from the groups formed by or Mannich bases.
• the lubricant composition according to the invention may comprise from 0.2 to 10% by mass of dispersants relative to the total mass of the lubricant composition.
• the lubricating composition can also comprise at least one polymer improving the viscosity index.
• polymers mention may be made of polymeric esters, copolymers of ethylene and propylene, homopolymers or copolymers of styrene, butadiene or isoprene, hydrogenated or not, polymethacrylates (PMA).
• PMA polymethacrylates
• the lubricant composition according to the invention can comprise from 1 to 15% by mass of polymers improving the viscosity index, relative to the total mass of the lubricant composition.
• the lubricating composition is not an emulsion.
• the lubricating composition is anhydrous.
• the invention also relates to a motor oil comprising a lubricating composition according to the invention.
• the engine oil can be of grade 0W-20 and 5W-30 according to the classification SAEJ300, characterized by a kinematic viscosity at 100 ° C (KV100) ranging from 5.6 to 12, 5 cSt measured according to international standard ASTM D445.
• KV100 kinematic viscosity at 100 ° C
• the engine oil can be characterized by a viscosity index, calculated according to international standard ASTM D2230, greater than or equal to 130, preferably greater than or equal to 150.
• base oils having a sulfur content of less than 0.3% for example group III mineral oils, and sulfur-free synthetic bases, preferably group IV, or mixtures thereof.
• the invention also relates to the use of a lubricating composition as defined above for the lubrication of mechanical parts, in particular in transmissions and / or engines of vehicles, preferably motor vehicles.
• the invention also relates to the use of a lubricating composition as defined above to reduce friction between two steel surfaces, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a lubricant composition above to reduce friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a lubricating composition as defined above to reduce friction between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• carbon coating according to the invention is meant any coating comprising carbon.
• These carbon coatings can be chosen from diamond coatings, and more particularly nanodiamond coatings.
• Such coatings can in particular be in the form of at least one layer of nanocrystalline diamond, having a purity ranging from 70 to 99%.
• the carbon coatings are chosen from nanodiamond coatings in the form of at least one layer of nanocrystalline diamond having a purity ranging from 70 to 99%, preferably ranging from 70 to 97%, advantageously of 75% and a thickness ranging from 0.1 to 3 ⁇ , preferably ranging from 0.5 to 2 ⁇ , advantageously 1.5 ⁇ .
• These carbon coatings can also be chosen from DLC (Diamond Like Carbon) type coatings.
• DLC coating Any type of DLC coating can be used as a carbon coating according to the invention.
• the DLC bring together a set of families of amorphous materials containing mainly carbon.
• hydrogenated DLCs in particular hydrogenated DLCs called a-C: H and non-hydrogenated DLCs, in particular non-hydrogenated DLCs called a-C or non-hydrogenated DLCs called ta-C.
• the DLCs have properties which vary according to their content of sp3 hybridized carbons and their hydrogen content. Certain variants of DLC can be doped with metallic elements, such as iron, chromium or tungsten.
• DLC coatings are generally less mechanically and thermally resistant because they are amorphous materials. On the other hand, they are generally less rough and above all can be deposited at low temperature on the majority of substrates.
• the DLCs are chosen from hydrogenated DLCs, in particular hydrogenated DLCs called a-C: H.
• the DLCs are chosen from hydrogenated DLCs, in particular hydrogenated DLCs called a-C: H containing from 10 to 40% of hydrogen.
• the invention also relates to the use of a lubricating composition as defined above for reducing the fuel consumption of vehicles, preferably motor vehicles.
• the invention also relates to a method of lubricating mechanical parts, in particular in transmissions and / or engines of vehicles, preferably motor vehicles, comprising at least one step of bringing at least one part into contact with a lubricating composition such as defined above.
• the invention also relates to a method for reducing friction between two steel surfaces, in particular in a vehicle engine, preferably of a motor vehicle, comprising at least one step of bringing at least one of the steel surfaces into contact with a lubricating composition as defined above.
• a subject of the invention is also a method for reducing friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle, comprising at least one step of bringing into contact at least one of the surfaces with a lubricating composition as defined above.
• the invention also relates to a method for reducing friction between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle, comprising at least one step of bringing at least one of the surfaces covered with carbon with a lubricating composition as defined above.
• the above method also makes it possible not to aggravate, or even reduce the wear between two steel surfaces, in particular in a vehicle engine, preferably a motor vehicle.
• the above method also makes it possible not to aggravate, or even reduce the wear between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the above method also makes it possible not to aggravate, or even reduce the wear between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to a method for reducing the fuel consumption of a vehicle, preferably a motor vehicle, comprising at least one step of bringing a mechanical part of the engine of the vehicle into contact with a lubricating composition such as defined above.
• Vehicles may include a two- or four-stroke internal combustion engine.
• the engines can be petrol or diesel engines intended to be powered by conventional petrol or diesel.
• conventional gasoline or by “conventional diesel” is meant in the sense of the present invention engines which are powered by a fuel obtained after refining an oil of mineral origin (such as petroleum for example).
• the engines can also be petrol engines or diesel engines modified to be powered by a fuel based on oils derived from renewable materials such as alcohol-based fuels or biodiesel fuel.
• the vehicles can be light vehicles such as automobiles and motorcycles. Vehicles can also be heavy goods vehicles, construction equipment, ships.
• the subject of the invention is also the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two steel surfaces , especially in a vehicle engine, preferably a motor vehicle.
• Another subject of the invention is the use of a fatty triamine in a lubricating composition
• a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between a steel surface and a surface covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the subject of the invention is also the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two surfaces covered with carbon, in particular in a vehicle engine, preferably a motor vehicle.
• the invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing the fuel consumption of a vehicle, preferably a motor vehicle.
• composition of concentrated additive type further comprises at least one additional additive.
• the additional additive can be chosen from the additives mentioned above.
• At least one base oil can be added to the composition of concentrated additive type according to the invention to obtain a lubricant composition according to the invention.
• Lubricant compositions No. 1 to No. 6 are described in Table II; the percentages given are mass percentages.
• Table II Lubricating composition # 1 # 2 # 3 # 4 N ° 5 N ° 6
• Base oil 100 98.5 98.6 97.5 97.6 99
• Compound comprising a dithiophosphate group 1 1 1 1 1 1 1
• Organomolybdenum compound 1 0.5 0.5 Organomolybdenum compound 2 0.4 0.4
• Test 1 evaluation of the friction properties of lubricating compositions on a steel / steel contact
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table III presents the coefficient of friction of lubricant compositions N ° 1, N ° 2 and N ° 4.
• Table III Composition # 1 # 2 # 4 Coefficient of steel / steel friction 0.150 0.035 0.025
• the lubricant composition according to the invention No. 4 has improved friction properties for steel / steel contacts, compared to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to l invention but not comprising fatty triamine according to the invention (composition N ° 2).
• Test 2 evaluation of the friction properties of lubricating compositions on a DLC / steel contact
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table IV presents the coefficient of friction of lubricant compositions N ° 1, N ° 2, N ° 4 and N ° 6.
• Table IV Composition # 1 # 2 # 4 N ° 6 DLC / steel coefficient of friction 0.070 0.070 0.053 0.080
• the lubricant composition according to the invention No. 4 has improved friction properties on DLC / steel contacts, compared to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but not comprising a fatty triamine according to the invention (composition No. 2), as well as compared to a lubricating composition comprising a fatty triamine according to the invention but not comprising an organomolybdenum compound according to the invention nor of a compound comprising a dithiophosphate group according to the invention (composition No. 6).
• Test 3 evaluation of the friction properties of lubricating compositions on a DLC / steel contact
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table V presents the coefficient of friction of lubricant compositions N ° 1, N ° 2 and N ° 4.
• Table V Composition # 1 # 2 # 4 DLC / steel coefficient of friction 0.070 0.090 0.060
• Test 4 evaluation of the friction properties of lubricating compositions on a DLC / steel contact
• the coefficient of friction is evaluated according to the method described in test 3.
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table VI presents the friction coefficient of the lubricant compositions N ° 1, N ° 3 and N ° 5.
• Table VI Composition # 1 # 3 N ° 5 DLC / steel coefficient of friction 0.070 0.090 0.060
• Lubricant compositions No. 7 to No. 10 are described in Table VII; the percentages given are mass percentages.
• Table VII Lubricating composition # 7 # 8 N ° 9 # 10 Base oil 100 98.5 97.5 99 Compound comprising a dithiophosphate group 1 1 Organomolybdenum compound 1 0.5 0.5 Oily triamine 1 1
• Test 5 evaluation of the friction properties of lubricating compositions on a steel / steel contact
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table VIII presents the coefficient of friction of the lubricant compositions N ° 7, N ° 8, N ° 9 and N ° 10.
• the lubricating composition according to the invention No. 9 has improved friction properties on steel / steel contacts, compared to a lubricating composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but not comprising a fatty triamine according to the invention (composition No. 8), as well as compared to a lubricating composition comprising a fatty triamine according to the invention but not comprising an organomolybdenum compound according to the invention nor of a compound comprising a dithiophosphate group according to the invention (composition No. 10).
• Test 6 evaluation of the friction properties of lubricating compositions on a steel / diamond contact
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table IX presents the coefficient of friction of lubricant compositions N ° 7, N ° 8 and N ° 9.
• the lubricant composition according to the invention No. 9 has improved friction properties for steel / diamond contacts, compared to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to l invention but not comprising fatty triamine according to the invention (composition N ° 8).
• Test 7 evaluation of the friction properties of lubricating compositions on a DLC / steel contact
• the coefficient of friction is evaluated according to the method described in test 2.
• a difference of at least 0.01 between two values of coefficient of friction is considered significant to show the influence on said coefficient of friction.
• Table X presents the friction coefficient of lubricant compositions N ° 7, N ° 8 and N ° 9. Paints Composition # 7 # 8 N ° 9 Coefficient of steel / diamond friction 0.070 0.080 0.070
• the lubricant composition according to the invention No. 9 has improved friction properties for DLC / steel contacts, compared to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to l invention but not comprising fatty triamine according to the invention (composition N ° 8).

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