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
  • C10M141/12—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 compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
• • 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
  • C10M121/00—Lubricating compositions characterised by the thickener being a compound of unknown or incompletely defined constitution
• • 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
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/06—Mixtures of thickeners and additives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/04—Elements
  • C10M2201/041—Carbon; Graphite; Carbon black
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/04—Elements
  • C10M2201/041—Carbon; Graphite; Carbon black
  • C10M2201/0416—Carbon; Graphite; Carbon black used as thickening agents
• • 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
  • C10M2205/024—Propene
• • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
  • C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
• • 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
  • 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
  • C10N2040/04—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
  • C10N2040/32—Wires, ropes or cables lubricants
• • 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
  • C10N2040/38—Conveyors or chain belts

Definitions

• the present invention relates to grease compositions, particularly used in industrial applications or public works, requiring very good resistance to heavy loads and shocks.
• lubricating greases which are solid or semi-fluid substances resulting from the dispersion of a thickener in a liquid lubricant, incorporating additives which give them particular properties.
• lubricating greases are prepared with thickeners such as metal salts of fatty acids.
• the fatty acid is dissolved in the base oil at a relatively high temperature, and then the appropriate metal hydroxide is added. After having evaporated by cooking the water which forms during the reaction, it is cooled for a definite period of time to form the soap network.
• Hydroxides of Lithium, Sodium, Calcium, Barium, Titanium or Aluminum, or certain aluminum trimers are suitable for example as metal compounds for the manufacture of grease.
• Long-chain fatty acids of the order of C14 to C28, mainly C18, generally come from vegetable oils (castor oil for example) or animal oils (for example tallow). They can be hydrogenated.
• the best known derivative is 12-hydroxystearic acid from ricinoleic acid.
• short-chain acids typically comprising between 6 and 12 carbon atoms, for example azelaic acid or benzoic acid. Complex fats are then formed.
• Metallic soaps form a fibrous structure, except for aluminum soaps, which have a spherical gel structure.
• Other inorganic thickeners such as, for example, bentonite, silica gel can be used.
• Polycarbamides (polyureas) are also found in the thickeners.
• polyurea thickened greases do not have sufficient mechanical stability, especially because of their thixotropic nature, which leads them to destructure under mechanical stresses.
• Inorganic thickeners also have problems with mechanical strength and water resistance, which is detrimental in open systems.
• the metal soaps have, for their part, a very good mechanical strength.
• greases thickened with simple or complex aluminum soaps have a very good mechanical strength, are very resistant to water (in particular complex aluminum greases), and have a very good adhesiveness to metal surfaces.
• the patent FR 1 048 670 for example describes a grease comprising an aluminum soap, allowing the lubrication of heavy parts in industry, which operate under rigorous conditions of temperature and loads.
• the presence of aluminum soap prevents the separation of the base oil from the grease, and therefore the destructuring of the grease.
• Application FR 2 172 080 also describes particularly stable greases thickened with aluminum soaps, as well as application FR 2 012 238, which also emphasizes their resistance to water.
• EP 0661378 discloses examples of greases thickened with complex aluminum soaps containing molybdenum dithiocarbamate (MoDTC), alone or in combination with zinc dithiophosphate (DTPZn). These compositions do not contain graphite. Their EP performance is poor, especially that of fat containing only MoDTC.
• MoDTC molybdenum dithiocarbamate
• DTPZn zinc dithiophosphate
• Thickened greases with complex aluminum soaps, and including antiwear, extreme pressure additives, as well as a friction modifier, molybdenum disulfide (MoS 2 ), are marketed under the name of COPAL MS 2 for applications on open gears in heavy industry such as cement plants, sugar mills (grinders, furnace control harnesses, slewing rings), or for public works machinery.
• MoS 2 molybdenum disulfide
• these fats have a high content of molybdenum (Mo), which it would be advantageous to reduce for environmental reasons, and extreme pressure properties which could be improved, in particular to withstand shocks and knocks, for example in the crushers and public works machinery.
• Mo molybdenum
• the greases may contain various solid lubricants known for their frictional and anti-wear properties, such as, for example, molybdenum or tungsten disulfide, graphite or polytetrafluoroethylene (PTFE).
• solid lubricants known for their frictional and anti-wear properties, such as, for example, molybdenum or tungsten disulfide, graphite or polytetrafluoroethylene (PTFE).
• the application FR 2 723 747 discloses high temperature greases for homokinetic joints comprising mineral and / or synthetic base oils, polyurea thickeners and MoS 2 as solid lubricant, as well as graphite and at least one organic molybdenum compound, preferentially molybdenum dithiocarbamate.
• Solid graphite lubricants, MoDTC, PTFE can lower the MoS 2 costly solid lubricant content, but without substituting it completely.
• the molybdenum content of the compositions disclosed is at least of the order of 5000 ppm.
• the present invention relates to fat compositions comprising:
• a thickener composed mainly of one or more simple or complex aluminum soaps
• compositions according to the invention comprise, as base oils (a), one or more mineral base oils, alone or as a mixture, and optionally one or more synthetic base oils.
• compositions according to the invention comprise at least one complex aluminum soap as thickener (b).
• the aluminum soap (s), simple (s) or complex (s) constitute at least 80% by weight of the thickener (b) in said compositions.
• the grease compositions according to the invention further comprise one or more additives chosen from antiwear and / or extreme pressure additives, preferably phosphosulfides, preferentially dithiophosphates.
• compositions according to one of claims 1 to 5 further comprising one or more polymers, preferably chosen from polyisobutenes.
• the molybdenum content is between 500 and 5000 ppm, preferably between 1000 and 4800 ppm.
• the mass content of graphite is between 0.5 and 3%, preferably between 0.7 and 2%.
• the present invention also relates to the use of a grease composition as described above for the lubrication of systems open, preferably open gears, wire ropes, chain drives.
• this use is made in the field of industry, preferably the cement industry, sugar, or steel, or in the field of public works.
• the present invention also relates to the use of an additive composition comprising molybdenum dithiocarbamate and graphite to increase the welding load, measured according to DIN 51350/4, of a thickened grease with simple aluminum soaps or complex.
• the present invention also relates to an open system, preferably open gear, wire rope, chain drive, on which is applied a grease composition as described above.
• the other base oil (s) used in the compositions according to the present invention may be oils of mineral or synthetic origin of groups I to V according to the classes defined in the API classification (American Petroleum Institute).
• the mineral base oils according to the invention include all types of bases obtained by atmospheric and vacuum distillation of crude oil, followed by refining operations such as solvent extraction, desalphating, solvent dewaxing, hydrotreatment, hydrocracking and hydroisomerization, hydrofinishing.
• the base oils of the grease compositions according to the present invention can also be synthetic oils, such as certain esters, silicones, glycols, polybutene, polyalphaolefins (PAO), alkylbenzene, alkylnaphthalene.
• synthetic oils such as certain esters, silicones, glycols, polybutene, polyalphaolefins (PAO), alkylbenzene, alkylnaphthalene.
• the base oils may also be oils of natural origin, for example esters of alcohol and carboxylic acids, obtainable from natural resources such as sunflower oil, rapeseed oil, palm oil, soy....
• the grease compositions according to the invention contain a mixture of mineral oils, for example paraffinic mineral oils and naphthenic mineral oils, as base oils (a).
• they contain a mixture of mineral oil (s), for example paraffinic mineral oils and naphthenic mineral oils, and synthetic oils, for example polyalphaolefins.
• the base oil mixture (a) is set so that its viscosity at 40 ° C. according to ASTM D 445 is between 100 and 500 cSt, preferably between 110 and 300 cSt, preferably between 150 and 250 cSt. .
• the greases according to the present invention are thickened to aluminum soaps, simple or complex, which have mechanical properties and adhesiveness to the upper surfaces, as well as excellent water resistance.
• the aluminum and fatty acid soaps can be prepared separately, or in situ during the manufacture of the fat (in the latter case, the fatty acid (s) is dissolved in the base oil, and then the compound is added. appropriate metal).
• the simple aluminum soaps are for example prepared from aluminum hydroxide AI (OH) 3 and one or more long-chain fatty acids, typically comprising from 10 to 28 carbon atoms, saturated or unsaturated, by example stearic acid.
• the complex aluminum soaps are prepared, for example, from stearic acid, benzoic acid and aluminum trimers corresponding to formula (I):
• R is a hydrocarbon radical, preferentially alkyl, for example isopropyl.
• the complex aluminum soaps have, compared to simple soaps, the advantage of better resistance to high temperature.
• the aluminum soaps are preferably used at levels of the order of 5 to 30% by weight, preferably 10 to 25% by weight, preferably from 105 to 20% by weight, typically 12% by weight in the greases according to US Pat. 'invention.
• the amount of metallic soap (es) is generally adjusted so as to obtain greases of grade 00, grade 0, grade 1 or grade 2 according to the NLGI classification.
• the greases according to the invention mainly contain aluminum soaps, simple or complex, as thickeners. This means that these Soaps together represent the highest percentage by weight in the greases according to the invention, compared to the percentage by weight of other thickening materials.
• the quantity of the aluminum soap or soaps, simple or complex constitutes at least 50%, even more preferably at least 80% by weight relative to the total weight of thickening materials, in the grease compositions according to the invention.
• the greases according to the invention can contain, as the major thickener, metal soap of simple or complex fatty acids, and smaller amounts of other thickeners, such as other metallic soaps, simple or complex, polyureas, or inorganic thickeners, type bentonite or alumino silicates.
• the greases according to the invention are free of polyurea thickeners, which are more technically complicated to manufacture, in particular because the components used in their manufacture, such as isocyanates and amines, are very toxic and unstable. in storage.
• the greases according to the invention exclusively contain simple or complex aluminum metal soaps as thickeners.
• the grease compositions according to the invention contain graphite and molybdenum dithiocarbamate. It has surprisingly been found, and even though graphite is known for its low resistance under heavy load, that this combination makes it possible to obtain thickened greases with aluminum soaps having very good extreme pressure properties, with reduced rate of molybdenum.
• compositions according to the invention contain molybdenum dithiocarbamates, friction modifying additives well known to those skilled in the art.
• molybdenum dithiocarbamate organometallic friction modifiers can for example be dialkyldithiocarbamates of molybdenum corresponding to formula (II):
• X 1 , X 2 , X 3 , X 4 are alkyl chains, preferably having 2 to 13 carbon atoms, preferably 2 to 6 carbon atoms.
• the amount of MoDTC of the compositions according to the invention is adjusted so that their molybdenum content is between 500 and 5000, preferably between 1000 and 4800 ppm, preferably between 1500 and 4500 ppm, preferentially between 2000 and 4000, preferably between 2500 and 3000 ppm. Too low MoDTC content leads to poor extreme pressure properties, too high a content is detrimental to the environment.
• This content can be measured according to the usual techniques, plasma, atomic absorption, flurescence X.
• the mass content of dialkyldithiocarbamate compositions according to the invention is between 0.3 and 2%, preferably between 0.5 and 1.7%, preferably between 0.7 and 1.5%, preferably between 0.8 and and 1.2%, typically 1%.
• the Mo / [graphite] ratio between the molybdenum content, in ppm, and the mass percentage of graphite in said compositions is between 1000 and 4000, preferably between 1500 and 3500, preferably between 2000 and 3000, preferably between 2500 and 2900.
• the grease compositions according to the invention contain graphite, in any form that can be incorporated in fats.
• the graphite employed in the compositions according to the invention may be a powder of micrometric size, with particle sizes of between approximately 1 and 15 ⁇ , and for example a size distribution characterized by a diameter D 50 of between 3 and 8 ⁇ , preferably between 5 and 7 ⁇ .
• the mass content of graphite compositions according to the invention is between 0.5 and 3%, preferably between 0.7 and 2%, preferably between 0.8 and 1.5%, preferably between 0.9 and 1 , 2%.
• the greases according to the invention optionally contain sulfur-phosphorus anti wear and extreme pressure additives commonly used in the formulation of greases and lubricants. These are for example and not limited to thiophosphoric acid, thiophosphorous acid, esters of these acids, their salts, and dithiophosphates, preferably dithiophosphates, in particular zinc dithiophosphates (DTPZn).
• Zinc dithiophosphates of formula (III) are particularly preferred:
• R 1, R 2, R 3 and R 4 are, independently of one another, linear or branched alkyl groups comprising from 1 to 24, preferably from 3 to 14 carbon atoms, or optionally substituted aryl groups containing from 6 to 30, preferably from 8 to 18 carbon atoms.
• These different compounds can be used alone or as a mixture in the grease compositions according to the invention.
• Their weight% is preferably between 0.5 and 5% by weight, preferably between 0.7 and 2% by weight, or between 0.8 and 1.5% by weight relative to the total weight of the composition.
• the lubricating compositions according to the present invention may also contain phosphorus anti-wear and extreme pressure additives, such as, for example, alkyl phosphates or alkyl phosphonates, phosphoric acid, phopsphorous acid, mono, di and triesters of phosphorous acid and phosphoric acid, and their salts.
• phosphorus anti-wear and extreme pressure additives such as, for example, alkyl phosphates or alkyl phosphonates, phosphoric acid, phopsphorous acid, mono, di and triesters of phosphorous acid and phosphoric acid, and their salts.
• the lubricating compositions according to the present invention may also contain sulfurous antiwear and extreme pressure additives, for example dithiocarbamates, thiadiazoles and benzothiazoles, sulfurized olefins.
• sulfurous antiwear and extreme pressure additives for example dithiocarbamates, thiadiazoles and benzothiazoles, sulfurized olefin
• the greases according to the invention may also contain any type of additive adapted to their use, for example antioxidants, such as amines or phenolics, antirust which may be oxygenated compounds such as esters, for example sorbitan monoleate , oxidized waxes, copper passivants ...
• antioxidants such as amines or phenolics
• antirust which may be oxygenated compounds such as esters, for example sorbitan monoleate , oxidized waxes, copper passivants ...
• the greases according to the invention may also contain polymers, for example polyolefins, polyisobutene (PIB), polyethylenes, polypropylene, heavy PAOs, copolymer olefins (OCP), for example hydrogenated diene-styrene, polymethacrylates (PMA), at levels generally between 1 and 35%.
• polymers for example polyolefins, polyisobutene (PIB), polyethylenes, polypropylene, heavy PAOs, copolymer olefins (OCP), for example hydrogenated diene-styrene, polymethacrylates (PMA), at levels generally between 1 and 35%.
• These polymers are used to improve the cohesiveness of the greases, which are thus more resistant to centrifugation.
• These polymers also lead to a better adhesiveness (especially PIB) of the grease to the surfaces, and increase the viscosity of the base oil fraction, thus the thickness of the oil film between the friction parts.
• the greases according to the invention are preferably manufactured by forming the metal soap in situ.
• One or more fatty acids are dissolved in a fraction of the base oil or base oil mixture at room temperature. This fraction is generally of the order of 50% of the total amount of oil contained in the final fat.
• the fatty acids can be long acids, comprising from 14 to 28 carbon atoms, to form a simple soap, optionally combined with short fatty acids, comprising from 6 to 12 carbon atoms, to form complex soaps.
• the compounds containing aluminum are added at a temperature of approximately 60 to 80.degree.
• the reaction of the fatty acids with the aluminum-containing compound (s) is allowed to proceed by heating to about 200 ° C.
• the grease is then cooled, in particular by the remaining fraction of base oil.
• the additives are then incorporated at about 80 ° C. Kneading is then carried out for a time sufficient to obtain a homogeneous fat composition.
• the consistency of a grease measures its hardness or fluidity at rest. It is quantified by the depth of penetration of a cone of given dimensions and mass. The fat is previously subjected to mixing. The conditions for measuring the consistency of a grease are defined by ASTM D 217.
• the fats are divided into 9 classes or 9 NLGI grades (National Lubricating Grease Institute) commonly used in the field of fats. These grades are shown in the table below.
• the greases according to the invention are preferably greases with a consistency of between 265 and 430, preferably between 310 and 430, and preferably between 265 and 340 tenths of a millimeter according to ASTM D217.
• they are NLGI grade 00, 0, 1 or 2, that is to say that their consistency is respectively between 400 and 430, or 355 and 385, or 310 and 340, or 265 and 295 tenths of a millimeter according to ASTM D217.
• Greases for open gears should adhere to the surfaces, but should not be too thick because they are applied by splashing the gear into a pan or spraying.
• the grades 0, 00, or 1 will therefore be preferred, that is to say the greases of consistency between 400 and 430 respectively, or 355 and 385, or 310 and 340 tenths of a millimeter according to ASTM D217.
• Fat compositions were prepared with a grease foot prepared from mineral base oil, and a complex aluminum soap obtained by reaction of benzoic acid, glycerol tri stearate (stearin), and a source of aluminum (aluminum trimer of formula (I) above).
• the base oil represents 82.50% by weight of the fat foot, and the aluminum soap complex 17.50% by weight.
• These fats are grade 2 according to the NLGI classification.
• This fat foot is used in a commercial grease comprising 2.5% MoS 2 , and various additives: an anti-wear additive (DTPZn), an extreme pressure and an anti-rust, which is taken as reference (reference 1).
• DTPZn anti-wear additive
• DTPZn extreme pressure
• anti-rust an anti-rust additive
• the fat compositions were prepared with the same foot of fat and the same additivation as the commercial reference fat, but the MoS 2 was totally or partially substituted with other solid lubricants:
• the MoDTC used is di-n-butyldithiocarbamate molybdenum
• the MoS 2 used is a micrometric powder consisting of particles of size between 0.5 and 8 ⁇ , of D50 about 2 ⁇ .
• Table 1 groups together the compositions and the performances of fats A to E compared to reference 1.
• the greases D and E according to the invention have significantly improved pressure properties (EP) compared to the reference, and a much lower molybdenum content.
• Grease A which does not contain molybdenum, shows no improvement in the extreme pressure properties.
• Fats B and C show a slight improvement in the EP properties (lower than that observed with the D and E greases), but their molybdenum content remains very high.
• Example 2
• Fat compositions were prepared with a fat foot prepared from mineral base oil, and a single lithium soap obtained by reaction of 12-hydroxystearic acid and lithium hydroxide (LiOH, H 2 O) L base oil represents 90.00% by weight of the foot of fat, and the simple lithium soap 10.00% by weight.
• LiOH, H 2 O lithium hydroxide
• These fats are grade 2 according to the NLGI classification.
• This foot of fat is used in the composition of a grease taken as reference (reference 2) further comprising 1% MoS 2 , and various additives: an antiwear additive (DTPZn), an extreme pressure, and an anti-rust, which is taken as reference (reference 2).
• DTPZn antiwear additive
• DTPZn extreme pressure
• anti-rust anti-rust
• the fat compositions F and G were prepared with the same fat base and the same additivation as the reference fat 2, but the MoS 2 was replaced by graphite and MoDTC (identical to those of Example 1). .
• Table 1 groups together the compositions and the performances of the F and G greases compared to the reference 2.

Landscapes

• 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)
• General Details Of Gearings (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=43797602

Family Applications (1)

Country Status (12)

Families Citing this family (16)

Family Cites Families (20)

• 2010
  • 2010-12-13 FR FR1060442A patent/FR2968670B1/fr not_active Expired - Fee Related
• 2011
  • 2011-12-12 BR BR112013014825A patent/BR112013014825A2/pt not_active Application Discontinuation
  • 2011-12-12 CN CN2011800655281A patent/CN103339242A/zh active Pending
  • 2011-12-12 EP EP11805229.9A patent/EP2652100B1/de not_active Not-in-force
  • 2011-12-12 WO PCT/IB2011/055622 patent/WO2012080940A1/fr active Application Filing
  • 2011-12-12 US US13/993,239 patent/US20130267447A1/en not_active Abandoned
  • 2011-12-12 MX MX2013006759A patent/MX2013006759A/es active IP Right Grant
  • 2011-12-12 KR KR1020137018024A patent/KR20130130016A/ko not_active Application Discontinuation
  • 2011-12-12 CA CA2820456A patent/CA2820456C/fr not_active Expired - Fee Related
  • 2011-12-12 AR ARP110104631A patent/AR084244A1/es not_active Application Discontinuation
  • 2011-12-12 JP JP2013543940A patent/JP5873104B2/ja not_active Expired - Fee Related
  • 2011-12-12 ES ES11805229.9T patent/ES2580208T3/es active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events