EP4112705A1 - Composition lubrifiante aqueuse comprenant une feuille nanométrique de mos2 - Google Patents

Composition lubrifiante aqueuse comprenant une feuille nanométrique de mos2 Download PDF

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Publication number
EP4112705A1
EP4112705A1 EP21305909.0A EP21305909A EP4112705A1 EP 4112705 A1 EP4112705 A1 EP 4112705A1 EP 21305909 A EP21305909 A EP 21305909A EP 4112705 A1 EP4112705 A1 EP 4112705A1
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EP
European Patent Office
Prior art keywords
composition according
lubricating composition
water
mos
anyone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21305909.0A
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German (de)
English (en)
Inventor
Benoit Thiebaut
Virginia Ruiz Fernández
Ignacio GARCÍA ALONSO
Andi Mikosch Cuka
Fabrice DASSENOY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre National de la Recherche Scientifique CNRS
Ecole Centrale de Lyon
TotalEnergies Onetech SAS
Original Assignee
Centre National de la Recherche Scientifique CNRS
Ecole Centrale de Lyon
TotalEnergies Onetech SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centre National de la Recherche Scientifique CNRS, Ecole Centrale de Lyon, TotalEnergies Onetech SAS filed Critical Centre National de la Recherche Scientifique CNRS
Priority to EP21305909.0A priority Critical patent/EP4112705A1/fr
Priority to CN202280046717.2A priority patent/CN117580933A/zh
Priority to PCT/EP2022/068048 priority patent/WO2023275236A1/fr
Priority to US18/571,910 priority patent/US20240228906A1/en
Priority to EP22740853.1A priority patent/EP4363534A1/fr
Publication of EP4112705A1 publication Critical patent/EP4112705A1/fr
Withdrawn legal-status Critical Current

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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
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/22—Compounds 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/06—Particles of special shape or size
    • 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
    • C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
    • 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
    • C10M2201/02—Water
    • 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
    • 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
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • 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
    • 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
    • C10N2040/02—Bearings
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/044—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for manual transmissions

Definitions

  • the present invention relates to lubricant compositions in particular for gear, bearing and transmission, in particular automotive gears and transmissions, for example for electric vehicle reducers and industrial gears and bearing, more particularly for manual gearboxes.
  • Gears, especially industrial gears face extreme operating conditions that can lead to damage, for example, wear to the internal components of the gears. This damage reduces the life of the gears, for example industrial gears, and can lead to costly and prolonged maintenance, repair costs, unscheduled downtime for the equipment that contains the gears.
  • Lubricants are used in industrial gears to solve a part of that issues and also in drive elements, such as automotive gears and transmissions, roller bearings, and plain bearings or seals on rotating shafts.
  • Lubricants are classically based on mineral oil or synthetic hydrocarbons, but also could be based on an aqueous basis.
  • the lubricants cause a separating, load-transferring lubricating film to be built up between the parts that slide or roll on one another. It is thus achieved that the metal surfaces do not touch, and thus, also reduced friction occurs.
  • the present invention relates to a lubricating composition
  • a lubricating composition comprising:
  • the active content of h-MOS 2 nanosheets is comprised between 0.005 and 0.1 wt%, preferably between 0.01 to 0.06 wt%, based on the total weight of the lubricating composition.
  • the lubricating composition comprises 0.05 to 1 wt% of surfactant, preferably non-ionic surfactant, preferably from 0.1 to 1 wt%, based on the total weight of the lubricating composition.
  • h-MoS 2 the "h” refers to the hexagonal phase of MoS 2 .
  • the crystal structure of MoS2 is hexagonal.
  • the UV-visible absorption spectra of the resulting h-MOS 2 (h is for hexagonal) nanosheet aqueous dispersion displayed the characteristic bands A and B at 660 and 603 nm respectively corresponding to the excitonic transitions of hexagonal MoS 2 nanosheets. Absorbance at these characteristic wavelengths was used to estimate the concentration of h-MOS 2 nanosheets.
  • the nanosheets of h-MOS 2 dispersed in the water has an average particle hydrodynamic size comprised between 25 and 65 nm, preferably between 30 and 60 nm, more preferably around 45 ⁇ 5 nm.
  • the average particle size of the nanosheets is measured by all techniques known by the skilled person, preferably by Transmission Electron Microscopy (TEM) for lateral size, Atomic Force Microscopy (AFM) for thickness or Dynamic Light Scattering (DLS) for hydrodynamic size.
  • TEM Transmission Electron Microscopy
  • AFM Atomic Force Microscopy
  • DLS Dynamic Light Scattering
  • the hydrodynamic size is the size of the dispersed particle with the solvation layer, it depends on the solvent (dielectric constant) and may be larger than the size of dry particle measured by microscopy.
  • the surfactant acts as a stabilizer of the h-MOS 2 nanosheets.
  • the surfactant can be a ionic surfactant, for example chosen among
  • the surfactant is preferably a non-ionic surfactant, sodium dodecyl sulphate, sodium dodecylbenzenesulphonate, lithium dodecyl sulphate, sodium cholate, taurodeoxycholate; or a non-ionic surfactant.
  • the surfactant is a non-ionic surfactant.
  • the non-ionic surfactant can for example chosen among: alcoholethoxylates, fatty acid ethoxylates, fatty acid alkanolamide ethoxylates, fatty alcohol polyglycol ethers, preferaby the non-ionic surfactant is alkylphenolethoxylates, for example the non-ionic surfactant is polyethylene glycol tert- octylphenyl ether (Triton ® X-100) commercialized by Sigma-Aldrich.
  • the water implemented in the invention is preferably purified water.
  • Purified water can be chosen among ultrapure water, demineralized water, osmotic water, deionized water.
  • the amount of water in the lubricating composition is greater than 35 wt%, preferably comprised between 35 and 99 wt%, preferably from 35 to 75 wt%, based on the total weight of the lubricating.
  • ultra-pure water or high-purity water or highly purified water
  • ultrapure water the water is treated to the highest levels of purity for all contaminant types, including: organic and inorganic compounds; dissolved and particulate matter; volatile and non-volatile; reactive, and inert; hydrophilic and hydrophobic; and dissolved gases.
  • ultrapure water is demineralized water.
  • the in-situ process enables to obtain h-MOS 2 nanosheets directly dispersed in the aqueous solution and stabilized with the surfactant.
  • the liquid phase exfoliation can be carried out by any method known by the skilled person, it is preferably carried out using a high-power tip sonicator or high-shear rotors. Preferably, the liquid phase exfoliation is carried out in reduced time, preferably from 4 to 8 hours.
  • the liquid -phase exfoliation is preferably followed by a centrifugation step that can be carried by any means known by the skilled person, it is preferably carried out by a centrifuge allowing for high rotation speeds for instance a Thermo Scientific Sorvall Legend XT. Preferably, the centrifugation is carried out during 1 to 4 hours from 1000 to 10000 rpm. The higher the speed, the smaller the size and concentration of nanosheets will be.
  • the bulk MoS 2 is not functionalized.
  • the bulk raw material is micron-sized (1-10 ⁇ m) MoS 2 powder (> 98.5% purity) from Acros Organics (CAS number: 1317-33-5)
  • the in-situ preparation of the h-MOS 2 nanosheets enables a single step preparation (there is no need of drying and isolating steps of h-MOS 2 nanosheets otherwise produced in a preexfoliating liquid media).
  • the in-situ process requires a lower concentration of MoS 2 nanosheets (compared to process of the literature) to obtain improved properties such as improved colloidal stability and reduction of wear and friction.
  • the lubricating composition according to the invention can also comprise polyalkylene glycol.
  • the polyalkylene glycols (denoted “PAG”) are chosen from water-soluble polyalkylene glycols.
  • the term "water-soluble” is intended to denote a polyalkylene glycol having a solubility in water of at least 10 g / L, preferably of at least 500 g / L, in water at ambient temperature (approximately 25 ° C).
  • the polyalkylene glycols can more particularly be formed of C1-C4, preferably C1-C3, more particularly C2-C3 alkylene oxide units.
  • a polyalkylene glycol used in an aqueous lubricating composition according to the invention comprises at least 50% by weight, in particular at least 80% by weight, more preferably at least 90% by weight of propylene oxide and / or ethylene oxide units. It may be an ethylene oxide / propylene oxide random copolymer.
  • a polyalkylene glycol used in an aqueous lubricating composition according to the invention has a kinematic viscosity measured at 100 ° C (KV100), according to the ASTM D445 standard, between 100 and 5000 mm 2 / s, in particular between 150 and 3000 mm 2 /s.
  • a polyalkylene glycol used in an aqueous lubricating composition according to the invention has a kinematic viscosity measured at 40 ° C (KV40), according to the ASTM D445 standard, between 500 and 30,000 mm 2 / s, more particularly between 1,000 and 25,000 mm 2 /s.
  • the flash point of a polyalkylene glycol used in an aqueous lubricating composition according to the invention is preferably greater than or equal to 160 ° C, in particular greater than or equal to 220 ° C.
  • the flash point can be measured by ISO 2592 or ASTM D92.
  • a polyalkylene glycol used in an aqueous lubricating composition according to the invention has a viscosity index measured according to the ASTM D2270 standard, of between 100 and 800, preferably between 250 and 550.
  • the lubricating composition according to the invention can also comprise various additives that are compatible with the aqueous solution.
  • the additives are used in a form soluble or emulsifiable in water, for example in the form of salts or ionic liquids.
  • Said additive(s) are of course chosen with regard to the intended application for the aqueous lubricant.
  • a person skilled in the art will take care to choose the optional additives and / or their quantity in such a way that the advantageous properties of the aqueous lubricating composition according to the invention, in particular the tribological properties, in particular of reduction of friction and protection of parts against wear, are not altered by the additives envisaged.
  • Such additives can be more particularly chosen from anti-foam agents, biocides, pH regulators, corrosion inhibitors, anti-wear and / or extreme pressure additives, sequestering agents, metal passivators, colorants, dispersants, emulsifying agents, and mixtures thereof.
  • a lubricating composition according to the invention can comprise one or more additives chosen from anti-foam agents, extreme pressure agents, corrosion inhibitors, pH regulators, metal passivators, colorants, and their mixtures.
  • a lubricating composition according to the invention may more particularly comprise from 0.1 to 10% by mass of additives, in particular from 1.0 to 8.0% by mass of additives, relative to the total mass of the composition.
  • An aqueous lubricating composition according to the invention can comprise at least one corrosion inhibitor agent.
  • Corrosion inhibitors advantageously make it possible to reduce or even prevent the corrosion of metal parts.
  • the nature of said corrosion inhibitor(s) can be chosen with regard to the metal to be protected against corrosion, such as aluminum, steel, galvanized steel, yellow metals, for example copper or brass.
  • the inorganic corrosion inhibitors may be mentioned nitrites, sulphites, silicates, borates, sodium, potassium, calcium or magnesium phosphates, alkali metal phosphates, hydroxides, molybdates, zinc sulphates, magnesium or nickel.
  • alkanolamines such as triethanolamine
  • aliphatic monocarboxylic acids in particular having 4 to 15 carbon atoms, for example octanoic acid
  • aliphatic dicarboxylic acids having 4 to 15 carbon atoms for example decane dioic acid, undecane dioic acid, dodecane dioic acid or their mixtures
  • polycarboxylic acids optionally neutralized with triethanolamine such as 1,3,5-triazine-2,4,6-tri-(6-aminocaproic) acid
  • alkanoylamidocarboxylic acids in particular isononanoylamidocaproic acid, and mixtures thereof.
  • Borated amides, products of the reaction of amines or amino alcohols with boric acid can also be used.
  • An aqueous lubricating composition according to the invention may in particular comprise from 0.1% to 5.0% by weight of corrosion inhibitor (s), preferably from 0.5% to 4.0% by weight, more preferably from 1.0% to 2.5% by mass, relative to the total mass of the composition.
  • corrosion inhibitor s
  • a lubricating composition according to the invention may comprise at least one anti-wear and / or extreme pressure additive. Their function is to reduce wear and the coefficient of friction, or to prevent metal-to-metal contact by forming a protective film adsorbed on these surfaces.
  • anti-wear additives among which may be mentioned those chosen from phosphosulfur additives such as metal alkylthiophosphates or their salts. Amine phosphates are also antiwear additives which can be used in a composition according to the invention. Additives which do not provide phosphorus may also be suitable, such as, for example, polysulphides, in particular sulfur-containing olefins.
  • extreme pressure additives suitable for the present invention, mention may be made of water-soluble extreme pressure additives, such as 2,5-dimercapto-1,3,4-thiadiazole (DMTD) or one of its salts, in in particular a disodium salt (NaDMTD).
  • DMTD 2,5-dimercapto-1,3,4-thiadiazole
  • NaDMTD disodium salt
  • An aqueous lubricating composition according to the invention may comprise between 0.01% and 10% by mass of anti-wear and / or extreme pressure additive(s) as defined above, preferably between 0.5% and 5.0% by mass, relative to the total mass of the composition.
  • An aqueous lubricating composition according to the invention may comprise at least one anti-foam additive.
  • Antifoams help prevent foaming of the lubricating fluid. It may, for example, be an anti-foaming agent based on polysiloxanes or on acrylate polymers. Preferably, the anti-foaming agent is chosen from three-dimensional siloxanes.
  • the anti-foaming agents can also be polar polymers such as polymethylsiloxanes or polyacrylates.
  • a lubricating composition according to the invention can comprise from 0.001% to 3.0% by weight of anti-foaming additive (s), preferably from 0.005% to 1.5% by weight, more preferably from 0.01 % to 1.0% by weight, relative to the total weight of the lubricating composition.
  • anti-foaming additive s
  • a lubricating composition according to the invention can comprise at least one pH regulating additive, in particular an alkaline buffer.
  • the pH regulator makes it possible to maintain the desired pH of the lubricating composition, in particular in order to preserve an alkaline pH, advantageously between 8 and 11, in particular to prevent corrosion of the metal surfaces.
  • the pH regulator can be chosen from amines, in particular alkanolamines and amino alcohols.
  • a pH regulating additive chosen from ethanolamines, such as monoethanolamine (MEA), diethanolamine (DEA); triethanolamine (TEA), diglycolamine (DGA) isopropanolamines, such as mono-isopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethylene amines, such as ethylene diamine (EDA), diethylene triamine (DETA), triethylene tetramine (TETA) and tetraethylene pentamine (TEPA), alkanolamines, such as methyldiethanol amine (MDEA), cyclamines, such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.
  • An aqueous lubricating composition according to the invention can in particular comprise from 0.1% to 10% by mass of additive (s) regulating the pH
  • a lubricating composition according to the invention can comprise at least one metal passivating agent.
  • Metal passivators protect metal parts by promoting the formation of metal oxide on their surface.
  • the metal passivating agents can for example be chosen from triazole derivatives, such as tetrahydrobenzotriazole (THBTZ), tolyltryazole (TTZ), benzotriazole (BTZ), amines substituted with a triazole group, such as N,N-bis(2-ethylhexyl)-1,2,4-triazol-1-yl methanamine, N'-bis(2 ethylhexyl)-4-methyl-1H-benzotriazol-1-methyl-amine, N,N-bis (heptyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(nonyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(decyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(undecyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,
  • the metal passivating agents are chosen from tetrahydrobenzotriazole (THBTZ), tolyltriazole (TTZ), benzotriazole (BTZ), and their salts, alone or as mixtures.
  • a lubricating composition according to the invention may in particular comprise from 0.01% to 2.0% by weight of metal passivating agent (s), preferably from 0.1% to 1.0% by weight, relative to the total mass of the composition
  • a lubricating composition according to the invention may comprise one or more dyes.
  • the dyes can be natural or synthetic, generally organic.
  • the dyes which can be used in an aqueous lubricating composition can be more particularly chosen from natural or synthetic water-soluble dyes, for example the dyes FDC Red 4, DC Red 6, DC Red 22, DC Red 28, DC Red 30, DC Red 33, DC Orange 4, DC Yellow 5, DC Yellow 6, DC Yellow 8, FDC Green 3, DC Green 5, FDC Blue 1, betanin (beet), carmine, a chlorophyllin, methylene blue , anthocyanins (enocianin, black carrot and hibiscus), caramel and riboflavin.
  • An aqueous lubricating composition according to the invention may comprise between 0.01% and 2.0% by weight of dye(s), preferably between 0.01% and 1.5% by weight, more preferably between 0.02% and 1.0% by weight, relative to the total weight of the composition.
  • a lubricating composition according to the invention can comprise one or more emulsifying agents, also called emulsifiers. Their function is to generate stable emulsions in water.
  • the emulsifying agents can be more particularly nonionic, such as, for example, ethoxylated fatty alcohols, ethoxylated fatty acids, ethoxylated fatty amides; anionic, for example soaps of KOH, NaOH; sulphonates; cationic, such as quaternary ammonium compounds; or else water-soluble or emulsifiable carboxylic acid esters.
  • an aqueous lubricating composition according to the invention can comprise from 0.01% to 10% by weight of emulsifying agent(s), preferably from 0.1% to 5.0% by weight, relative to the total weight of the lubricating composition.
  • a lubricating composition according to the invention can comprise at least one sequestering agent.
  • Sequestering agents also called chelating agents, make it possible to limit the encrustation of metal ions in the composition.
  • sequestering agents there may be mentioned those derived from phosphonic acids and phosphonates, such as diethylenetriaminepentamethyl phosphonic acid (DTPMPA), amino tri(methylene phosphonic acid) (ATMP), acid hydroxyethanediphosphonic acid (HEDP), 1-hydroxylethylidene 1,1-diphosphonate, 2-hydroxyethylamine di (methylene phosphonic) acid (HEAMBP), diethylene triamino penta (methylene phosphonic) acid (DTMP), acids multifunctional organic and hydroxy acids, such as ethylenediaminetetraacetic acid (EDTA), pteroyl-L-glutamic acid (PGLU), organic polyacids, such as maleic acid and polyaspartic acid, polysaccharides and carbohydrates,
  • a lubricating composition according to the invention can comprise at least one biocidal and / or fungicidal agent.
  • Biocides and fungicides can be used to improve the biological stability of the composition by limiting the proliferation of bacteria, fungi and yeasts in the lubricating fluid.
  • Such biocides can be chosen from parabens, aldehydes, reactive acetylacetone compounds, isothiazolinones, phenolic compounds, acid salts, halogenated compounds, quaternary ammoniums, certain alcohols and their mixtures.
  • the biocides can be chosen from optionally substituted benzisothiazolinones (BIT), such as N-butyl-1,2-benzisothiazolin-3-one, methylisothiazolinones (MIT), mixtures of methylisothiazolinone and chloromethylisothiazolinone (MIT / CMIT), orthophenyl-phenol (OPP) or its sodium salt, 3-iodo-2-propynylbutylcarbamate (IPBC), chloro-cresol and N, N-methylene-bis-morpholine (MBM); sorbic acid; preferably from orthophenyl-phenol (OPP) or its sodium salt, 3-iodo-2-propynylbutylcarbamate, chloro-cresol, benzisothiazolinones and N, N-methylene-isomorpholine.
  • BIT optionally substituted benzisothiazolinones
  • BIT optionally substituted benzisothiazolin
  • An aqueous lubricating composition according to the invention can in particular comprise between 0.01% and 10% by weight of biocide (s) and / or fungicide (s), preferably between 0.5% and 5.0% by weight, relative to the total weight of the composition.
  • the lubricating composition according to the invention comprises less than 5 wt% of non-water soluble oil, preferably less than 2 wt%, more preferably less than 1 wt%, based on the total weight of the lubricating composition.
  • the lubricating composition of the invention does not comprise non-water soluble oil.
  • Non-water soluble oil is oil that is not substantially solubilized in water at room temperature (around 25°C).
  • non-water soluble oil has a solubility in water less than 0.2 g/l at room temperature (around 25°C).
  • Such oil is for example lubricating base oil from groups I to V of the API classification (or equivalent in ATIEL classification) and their mixtures.
  • the present invention also relates to a process for preparing the lubricating composition according to the invention comprising the following steps:
  • the present invention also relates to a process for creating h-MOS 2 nanosheets in an aqueous solution comprising the following steps:
  • the water, the surfactant and the h-MOS 2 nanosheets are as decribed above.
  • the in-situ process enables to obtain h-MOS 2 nanosheets directly dispersed in the aqueous solution and stabilized with the surfactant.
  • the liquid phase exfoliation can be carried out by any method known by the skilled person, it is preferably carried out using a high-power tip sonicator or a high-shear rotor. Preferably, the liquid phase exfoliation is carried out in reduced time, preferably from 4 to 8 hours.
  • the centrifugation step can be carried by any means known by the skilled person, it is preferably carried out by a centrifuge allowing for high rotation speeds for instance, a Thermo Scientific Sorvall Legend XT. Preferably, the centrifugation is carried out during 1 to 4 hours at 1000 to 10000rpm.
  • the present invention also relates to the use of the lubricating composition according to the invention for the lubrication of mechanical parts of a mechanic system, preferably for gear, bearing and transmission, in particular automotive gears and transmissions, for example electric vehicle reducers and industrial gears and bearing, , particularly of manual gearboxes.
  • the use of the composition according to the present invention enables to reduce wear and friction.
  • the present invention also relates to a process for lubricating mechanical parts of a mechanic system, preferably for gear, bearing and transmission, in particular automotive gears and transmissions, for example electric vehicle reducers and industrial gears and bearing, , particularly of manual gearboxes, comprising putting the mechanical parts of the mechanic system in contact with the lubricating composition according to the invention.
  • the present invention also relates to a process for reducing wear and friction on mechanical parts of a mechanic system, preferably gear, bearing and transmission, in particular automotive gears and transmissions, for example electric vehicle reducers and industrial gears and bearing, particularly of manual gearboxes, comprising putting the mechanical parts of the mechanic system in contact with the lubricating composition according to the invention.
  • a mechanic system preferably gear, bearing and transmission, in particular automotive gears and transmissions, for example electric vehicle reducers and industrial gears and bearing, particularly of manual gearboxes
  • the surface of steel 100Cr6 disks and balls after the pin-on-disk tribology measurements was examined by optical microscopy (Leica DM4000M) and confocal microscopy (Leica DCM3D) to evaluate wear of both contacting surfaces lubricated by the different formulations.
  • the ball wear volume loss was estimated from the radius of the wear trace using the equation to calculate the volume of a spherical cap.
  • Stability refers to the time without observing sedimentation and preserving tribological performance.
  • Aqueous solutions of h-MOS 2 nanosheets were produced by liquid-phase exfoliation of bulk micron-sized MoS 2 powder (4 mg/ml) (99%, Acros Organics) in water containing a certain amount of TX-100 (0.1-1% wt.) using a high-power tip sonicator (Dr. Hielscher UP 400S at the highest amplitude and frequency) for times ranging from 4 to 8 hours. Volumes used varied from 30 to 100 mL.
  • nanosized h-MOS 2 nanosheets are obtained directly dispersed in the aqueous lubricants as a result of the exfoliation process.
  • the final concentration of h-MOS 2 nanosheets can be tuned by varying the sonication time and centrifugation speed and time in a way that the highest concentrations correspond to large sonication times and low centrifugation speed and time.
  • the tribological measurements mentioned above are carried out using 1mL out of a 65 mL sample.
  • the pin-on-disk tests were carried out on 66HRC 100CR6 steel disks under the following conditions: 25°C temperature, 5N load, 2 cm/s sliding speed and 130 m distance or on 34HRC 100CR6 steel disks under the following conditions: 25°C temperature, 5N load, 2 cm/s sliding speed and 80 m distance

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)
EP21305909.0A 2021-07-01 2021-07-01 Composition lubrifiante aqueuse comprenant une feuille nanométrique de mos2 Withdrawn EP4112705A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP21305909.0A EP4112705A1 (fr) 2021-07-01 2021-07-01 Composition lubrifiante aqueuse comprenant une feuille nanométrique de mos2
CN202280046717.2A CN117580933A (zh) 2021-07-01 2022-06-30 含MoS2纳米片的水性润滑组合物
PCT/EP2022/068048 WO2023275236A1 (fr) 2021-07-01 2022-06-30 Composition lubrifiante aqueuse comprenant une nanofeuille de mos2
US18/571,910 US20240228906A1 (en) 2021-07-01 2022-06-30 AQUEOUS LUBRICATING COMPOSITION COMPRISING MoS2 NANOSHEET
EP22740853.1A EP4363534A1 (fr) 2021-07-01 2022-06-30 Composition lubrifiante aqueuse comprenant une nanofeuille de mos2

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EP21305909.0A EP4112705A1 (fr) 2021-07-01 2021-07-01 Composition lubrifiante aqueuse comprenant une feuille nanométrique de mos2

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Citations (2)

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US20120149616A1 (en) * 2009-09-01 2012-06-14 Klueber Lubrication Muenchen Kg Water-based lubricants
CN106520354A (zh) * 2016-10-21 2017-03-22 青岛大学 一种基于二维材料纳米片/碳量子点的水基润滑液及其制备方法

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CN104560347A (zh) * 2014-12-29 2015-04-29 北京航空航天大学 一种原位制备二硫化钼纳米片水基润滑剂的方法

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US20120149616A1 (en) * 2009-09-01 2012-06-14 Klueber Lubrication Muenchen Kg Water-based lubricants
CN106520354A (zh) * 2016-10-21 2017-03-22 青岛大学 一种基于二维材料纳米片/碳量子点的水基润滑液及其制备方法

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EP4363534A1 (fr) 2024-05-08
US20240228906A1 (en) 2024-07-11
CN117580933A (zh) 2024-02-20
WO2023275236A1 (fr) 2023-01-05

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