EP4179048A1 - Utilisation d'ester de dialkylène glycol pour augmenter la résistance à l'oxydation d'une composition lubrifiante - Google Patents
Utilisation d'ester de dialkylène glycol pour augmenter la résistance à l'oxydation d'une composition lubrifianteInfo
- Publication number
- EP4179048A1 EP4179048A1 EP21739701.7A EP21739701A EP4179048A1 EP 4179048 A1 EP4179048 A1 EP 4179048A1 EP 21739701 A EP21739701 A EP 21739701A EP 4179048 A1 EP4179048 A1 EP 4179048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- linear
- carbon atoms
- branched
- groups
- alkyl group
- 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- Withdrawn
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
- C10M129/74—Esters of polyhydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials 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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
-
- 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
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- 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
- C10N2020/02—Viscosity; Viscosity index
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- 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
- C10N2030/02—Pour-point; Viscosity index
-
- 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
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- 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
- C10N2030/74—Noack Volatility
Definitions
- TITLE Use of dialkylene glycol ester to increase the resistance to oxidation of a lubricating composition
- the present invention relates to the use of dialkylene glycol ester to increase the resistance to oxidation of a lubricating composition.
- Lubricating compositions also called “lubricants”, are commonly used in engines for the main purposes of reducing the frictional forces between the various moving metal parts in the engines. They are also effective in preventing premature wear or even damage to these parts, and in particular to their surface.
- One of the main objectives in the automotive field in particular is to try to increase the life of lubricating compositions and consequently to reduce oil change intervals.
- Lubricating compositions are subject to numerous constraints, in particular mechanical, but also to oxidation constraints. These oxidation stresses are due in particular to contact between the lubricating composition and air and/or water as well as to changes in temperature of the lubricating composition.
- An objective of the present invention is therefore to propose an additive making it possible to increase the resistance to oxidation of a lubricating composition.
- Another objective of the present invention is also to propose an additive making it possible to reduce the level of oxidation of a lubricating composition.
- Another objective is still and to provide an additive making it possible to increase the service life of a lubricating composition and consequently to reduce the oil change intervals.
- R represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, in particular a methyl, ethyl or propyl group, preferably methyl; s represents 1 or 2; n represents 1, 2 or 3, it being understood that when s is different from 1, the n may be identical or different;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that, when s equals 2 and n, which are identical, equals 2, at least one of the R groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms; and provided that, when s is 1 and n is 3, at least one of the R groups bonded to the carbon in the beta position of the oxygen atoms of the ester functions represents a hydrogen atom.
- the present invention also relates to the use of at least one diester of formula (I) in a lubricating composition comprising at least one base oil to reduce the level of oxidation of said lubricating composition, in which :
- R represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, in particular a methyl, ethyl or propyl group, preferably methyl; s represents 1 or 2; n represents 1, 2 or 3, it being understood that when s is different from 1, the n may be identical or different;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that, when s equals 2 and n, which are identical, equals 2, at least one of the groups R represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms; and provided that, when s is 1 and n is 3, at least one of the R groups linked to the carbon in the beta position of the oxygen atoms of the ester functions represents a hydrogen atom.
- the present invention also relates to a method for increasing the resistance to oxidation of a lubricating composition comprising at least one base oil comprising the addition to said lubricating composition of at least one diester of formula (I)
- R represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, in particular a methyl, ethyl or propyl group, preferably methyl; s represents 1 or 2; n represents 1, 2 or 3, it being understood that when s is different from 1, the n may be identical or different;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that, when s equals 2 and n, which are identical, equals 2, at least one of the R groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms; and provided that, when s is 1 and n is 3, at least one of the R groups bonded to the carbon in the beta position of the oxygen atoms of the ester functions represents a hydrogen atom.
- the present invention also relates to a method for reducing the level of oxidation of a lubricating composition comprising at least one base oil comprising the addition to said lubricating composition of at least one diester of formula (I)
- R represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, in particular a methyl, ethyl or propyl group, preferably methyl;
- s represents 1 or 2;
- n represents 1, 2 or 3, it being understood that when s is different from 1, the n may be identical or different;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that, when s equals 2 and n, which are identical, equals 2, at least one of the R groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms; and provided that, when s is 1 and n is 3, at least one of the R groups bonded to the carbon in the beta position of the oxygen atoms of the ester functions represents a hydrogen atom.
- the modification of the level of oxidation of a lubricating composition is determined by measuring its viscosity, and the evolution of this viscosity, for example KV100 or KV40. Indeed, as polar oxidation compounds begin to form, following the entry of oxygenated compounds into the structure of the lubricating composition, the viscosity and/or the acidity of the composition lubricant increase. It is thus possible to determine the level of oxidation of a lubricating composition comprising or not comprising the diester according to the invention and to determine the impact of this diester on the level of oxidation and consequently on the resistance to 'oxidation.
- the KV100 and the KV40 can be measured in any manner known to those skilled in the art and in particular according to the ASTM445 standard.
- n 2 or 3, preferably 2.
- at least one of the R groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably from 1 to 4 carbon atoms. carbon, more preferably methyl, ethyl or propyl, advantageously methyl.
- the diester of formula (I) according to the invention is a diester of the following formula (G):
- R and R' represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably a methyl, ethyl or propyl group, preferably a methyl group ; s represents 1 or 2; n represents 2; m represents 2;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that, when s is 2, at least one of the groups R or R' represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms.
- At least one of the R or R' groups in the diester of formula (G) represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably from 1 to 4 carbon atoms, of preferably methyl, ethyl, or propyl, advantageously methyl.
- Ra and Rb have a linear sequence of 7 to 14 carbon atoms, preferably 8 to 12 carbon atoms, more particularly 8 to 11 carbon atoms. carbon, in particular 9 or 11 carbon atoms.
- the diester of the invention is preferably a compound of formula (Ia): R a -C(0)-0-([C(R)2]n-0)-([C(R , >2]n-0)- €(0)-R b
- R and R' represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms; provided that at least one of the groups R or R' represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl.
- At least one of the groups R represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl; and at least one of R' represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl.
- one of the groups R represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl; and one of R' represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl; the other groups R and R' representing hydrogen atoms.
- the diester of the invention is a compound of formula (l”a)
- one of the groups R 1 and R 2 represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, the other representing a hydrogen atom
- one of the R 3 and R 4 groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, the other representing a hydrogen atom
- one of the R 3 and R 4 groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, the other representing a hydrogen atom
- Ra and Rb identical or different, are as defined previously.
- one of the groups R 1 and R 2 represents a methyl, ethyl or propyl group, preferably methyl, the other representing a hydrogen atom
- one of the R 3 and R 4 groups represents a methyl, ethyl or propyl group, preferably methyl, the other representing a hydrogen atom.
- R represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl;
- Ra and Rb which are identical or different, represent, independently of each other, hydrocarbon groups, saturated or unsaturated, linear or branched, having a linear sequence of 6 to 18 carbon atoms.
- At least one of R represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl.
- one of the R groups represents an alkyl group, linear or branched, comprising from 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, preferably methyl, the others represent hydrogen atoms.
- linear sequence of x to y carbon atoms a carbon chain, saturated or unsaturated, preferably saturated, comprising from x to y carbon atoms, one after the other. others, the carbon atoms possibly present at the level of the branches of the chain carbon is not taken into account in the number of carbon atoms (xy) constituting the linear sequence.
- Ra and Rb which are identical or different, are derived from plant origin , animal or petroleum.
- Ra and Rb which are identical or different, represent saturated groups.
- Ra and Rb which are identical or different, represent linear groups.
- Ra and Rb which are identical or different, represent saturated linear hydrocarbon groups comprising from 6 to 18 carbon atoms, preferably from 7 to 17 carbon atoms, in particular from 7 to 14 carbon atoms, preferably from 8 to 12 carbon atoms, especially 9 or 12 carbon atoms.
- Ra and Rb which are identical or different, represent alkyl groups saturated linear atoms comprising from 6 to 18 carbon atoms, preferably from 7 to 17 carbon atoms, in particular from 7 to 14 carbon atoms, preferably from 8 to 12 carbon atoms, in particular 9 or 12 carbon atoms.
- Ra and Rb are identical.
- diesters of formula (I) may be commercially available or prepared according to synthetic methods described in the literature and known to those skilled in the art, in particular according to methods described in WO201925446.
- the diester of formula (I) is added in a proportion of 10 to 70% by mass relative to the total mass of the lubricating composition.
- the base oil used in the lubricating compositions of the invention may be oils of mineral or synthetic origin belonging to groups I to V according to the classes defined by the API classification (or their equivalents according to the ATIEL classification (Table 1) or mixtures thereof.
- the mineral base oils of the invention include any type of base oil obtained by atmospheric and vacuum distillation of crude oil, followed by scouring operations such as solvent extraction, deasphalting, solvent dewaxing, hydrotreating, hydrocracking, hydroisomerization and hydrofinishing.
- Blends of synthetic and mineral oils can also be used.
- the base oils of the lubricating compositions according to the invention can also be chosen from synthetic oils, such as certain esters of carboxylic acids and alcohols, and polyalphaolefins.
- the polyalphaolefins used as base oil are for example obtained from monomers comprising from 4 to 32 carbon atoms, for example from octene or decene, and for which the viscosity at 100° C. is between 1 .5 and 15 mm2.s-1 according to the ASTM D445 standard. Their average molar mass is generally between 250 and 3000 according to the ASTM D5296 standard.
- the lubricating composition according to the invention may comprise at least 50% by weight of base oil relative to the total weight of the composition.
- the lubricating composition according to the invention comprises at least 60% by weight, or even at least 70% by weight, of base oils relative to the total weight of the lubricating composition. More preferably, the lubricating composition according to the invention comprises from 75 to 97% by weight of base oils relative to the total weight of the composition.
- composition of the invention may also comprise at least one additive.
- the preferred additives for the lubricating composition according to the invention are chosen from detergent additives, the friction modifier additives differ from the molybdenum compounds defined above, extreme pressure additives, dispersants, pour point activators, anti- foam, thickeners and mixtures thereof.
- the lubricating compositions according to the invention comprise at least one extreme pressure additive, or a mixture.
- Anti-wear additives and extreme pressure additives protect surface friction by forming a protective film adsorbed on its surfaces.
- the anti-wear additives are chosen from additives comprising phosphorus and sulfur such as metal alkylthiophosphate, in particular zinc alkylthiophosphate, and more precisely zinc dialkyldithiophosphate or ZnDTP.
- the preferred compounds are of formula Zn((SP(S)(OR)(OR'))2, in which R and R', identical or different, independently represent an alkyl group, preferably an alkyl group comprising from 1 to 18 carbon atoms.
- Amine phosphates are also anti-wear additives which can be used in the lubricating compositions of the invention.
- the phosphorus atoms provided by these additives can act as a poison for automotive catalytic systems since they generate ash. It is possible to minimize these effects by substituting part of the amine phosphates with additives that do not provide phosphorus, such as, for example, polysulfides, in particular olefins containing sulfur.
- the lubricating compositions according to the invention may comprise from 0.01 to 6% by weight, preferably from 0.05 to 4% by weight, more preferably from 0.1 to 2% by weight relative to the total weight of lubricating composition, anti-wear and extreme pressure additives.
- the lubricating compositions according to the invention comprise from 0.01 to 6% by weight, preferably from 0.05 to 4% by weight, more preferably from 0.1 to 2% by weight relative to the total weight of composition lubricant, anti-wear additives (or anti-wear compound).
- compositions according to the invention may comprise at least one friction modifier additive different from the molybdenum compounds of the invention.
- the friction modifier additives can in particular be chosen from compounds providing metallic elements and ashless compounds.
- compounds providing metallic elements mention may be made of complexes of transition metals such as Mo, Sb, Sn, Fe, Cu, Zn for which the ligands may be hydrocarbon compounds comprising oxygen, nitrogen , sulfur or phosphorus.
- Ashless friction modifier additives are generally of organic origin or can be selected from monoesters of fatty acids and polyols, alkoxylated amines, alkoxylated fatty amines, fatty epoxides, borates fatty epoxides, fatty amines or glycerol acid esters.
- the fatty compounds comprising at least one hydrocarbon group comprising from 10 to 24 carbon atoms.
- the lubricating composition according to the invention may comprise from 0.01 to 2% by weight or from 0.01 to 5% by weight, preferably from 0.1 to 1.5% by weight or from 0.1 to 2 % by weight relative to the total weight of the lubricating composition, of friction modifier additive different from the molybdenum compounds according to the invention.
- the lubricating composition according to the invention may comprise at least one antioxidant additive.
- Antioxidant additives generally delay the degradation of the lubricating composition. This degradation is most often expressed by the formation of deposits, by the presence of sludge or by an increase in the viscosity of the lubricating composition.
- Antioxidant additives generally act as free radical inhibitors or destructive hydroperoxide inhibitors.
- antioxidants of the phenolic type, antioxidants of the amine type, antioxidants containing sulfur and phosphorus. Some of these antioxidants, for example those comprising sulfur and phosphorus, can generate ash.
- the phenolic antioxidant additives may be ash-free or may be in the form of neutral or basic metal salts.
- the antioxidant additives may in particular be chosen from sterically hindered phenols, esters of sterically hindered phenols, sterically hindered phenols comprising a thioether bridge, diphenylamines, diphenylamines substituted with at least one C1 to C12 alkyl group, N,N '-dialkyl-aryl-diamines and mixtures thereof.
- the sterically hindered phenols are chosen from compounds comprising a phenol group for which at least one of the carbon atoms in the vicinity of the carbon atom carrying the alcohol function is substituted by at least one alkyl group in C1 to C10, preferably C1 to C6 alkyl, preferably C4 alkyl, preferably tert-butyl.
- Amine compounds are another class of antioxidant additives which may be used, optionally in combination with phenolic antioxidant additives.
- amine compounds are aromatic amines, for example aromatic amines of formula NRaRbRc in which Ra represents an aliphatic group or an optionally substituted aromatic group, Rb represents an optionally substituted aromatic group, Rc represents a hydrogen atom, an alkyl group, an aryl group or a group of the formula RdS(0)zRe in which Rd represents an alkylene or alkenylene group, Re represents an alkyl group, an alkenyl group or an aryl group and z represents 0, 1 or 2.
- Sulfur-containing alkyl phenols or their alkali or alkaline earth metal salts can also be used as antioxidant additives.
- antioxidant additives are compounds comprising copper, for example copper thio- or dithio-phosphate, salts of copper and carboxylic acids, dithiocarbamates, sulfonates, phenates, copper acetylacetonates. Copper I and II salts, succinic acid or anhydride salts can also be used.
- the lubricating compositions according to the invention can also comprise any type of antioxidant known to those skilled in the art.
- the lubricating composition comprises at least one ash-free antioxidant additive.
- the lubricating composition according to the invention comprises from 0.1 to 2% by weight relative to the total weight of the composition, of at least one antioxidant additive.
- the lubricating composition according to the invention may also comprise at least one detergent additive.
- Detergent additives generally reduce the formation of deposits on the surface of metal parts by dissolving secondary products of oxidation and combustion.
- detergent additives which can be used in the lubricating compositions according to the invention are generally known to those skilled in the art.
- Detergent additives can be anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophobic head.
- the associated cation can be a metal cation of an alkali or alkaline earth metal.
- the detergent additives are preferably chosen from alkali metal or alkaline earth metal salts of carboxylic acid, sulfonates, salicylates, naphthenates, as well as phenate salts.
- the alkali and alkaline-earth metals are preferably calcium, magnesium, sodium or barium.
- metal salts generally comprise the metal in a stoichiometric quantity or in excess, that is to say in a content greater than the stoichiometric content.
- overbased detergents the excess metal implying the overbased nature of the detergent additive is usually in the form of an oil-insoluble metal salt, eg carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate.
- the lubricating composition according to the invention can comprise from 0.5 to 8% or from 2 to 4% by weight of overbased detergent additive relative to the total weight of the lubricating composition.
- the lubricating composition according to the invention may also comprise a pour point depressant additive.
- the pour point depressant additive By slowing down the formation of paraffin crystals, the pour point depressant additive generally improves the cold behavior of the lubricating composition according to the invention.
- alkyl polymethacrylates examples include polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalene, alkyl polystyrenes.
- the lubricating composition according to the invention can also comprise a dispersing agent.
- the dispersing agents can be chosen from Mannich bases, succinimides and their derivatives.
- the lubricating composition according to the invention may comprise from 0.2 to 10% by weight of dispersing agent relative to the total weight of lubricating composition.
- the lubricating composition according to the invention may also further comprise at least one other additional polymer improving the viscosity index.
- additional polymer improving the viscosity index mention may be made of polymeric esters, homopolymers or copolymers, hydrogenated or not, of styrene, butadiene and isoprene, polymethacrylates (PMA).
- PMA polymethacrylates
- the lubricating composition according to the invention may comprise from 1 to 15% by weight, relative to the total weight of the lubricating composition, of additive improving the viscosity index.
- the lubricating composition according to the invention may also comprise at least one thickening agent.
- the lubricating composition according to the invention may also comprise an antifoaming agent and a demulsifying agent.
- the lubricating composition of the invention also comprises at least one anti-wear agent, in particular based on Zinc, in particular ZnDTP.
- the present invention also relates to the use of the lubricating composition according to the invention for reducing the friction of the mechanical parts of an engine, at least one of the parts comprising a coating of amorphous carbon type, preferably hydrogenated amorphous carbon.
- Figure 1 presents the KV40 values as a function of time for the compositions of the invention and the comparative compositions.
- Figure 2 presents the KV100 values as a function of time for the compositions of the invention and the comparative compositions.
- lubricating compositions described in Table 2 are prepared (CC2, CC3, CC4 and CC5 are comparative compositions, C2 and C3 are compositions according to the invention).
- Table 3 below groups together the characteristics of the lubricating compositions of Example 1.
- the KV100 and KV40 are measured according to the ASTMD445 standard and expressed in mm2/s.
- the VI is measured according to the ISO2909 standard.
- the HTHS is measured according to the CEC L-036 standard and expressed in mPa.s
- the KV100 and the KV40 of the compositions C2, CC2, CC3, C3, CC4 and CC5 were measured as a function of time according to the ASTMD445 standard. The measurements were made after 3 days, 4 days, 5 days, 6 days, 7 days, 8 days and 9 days, according to the following protocol:
- a container comprising the compositions to be tested air is injected at a flow rate of 10L.h-1 for the entire duration of the test. Iron is also added in an amount of 100 ppm at T0 in order to stimulate/catalyze the oxidation of the compositions tested.
- the container comprising the compositions tested is left for the entire duration of the test in a water bath heated to 170°C.
- Figures 1 and 2 clearly show that the addition of the diester of the invention makes it possible to limit and delay the increase in viscosity of the lubricating composition.
- the diester of the invention allows an increase in the resistance to oxidation and a decrease (or reduction) in its level of oxidation.
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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)
- Lubricants (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2007286A FR3112349B1 (fr) | 2020-07-09 | 2020-07-09 | Utilisation d’ester de dialkylène glycol pour augmenter la résistance à l’oxydation d’une composition lubrifiante |
| PCT/EP2021/068857 WO2022008603A1 (fr) | 2020-07-09 | 2021-07-07 | Utilisation d'ester de dialkylène glycol pour augmenter la résistance à l'oxydation d'une composition lubrifiante |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4179048A1 true EP4179048A1 (fr) | 2023-05-17 |
Family
ID=72709614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21739701.7A Withdrawn EP4179048A1 (fr) | 2020-07-09 | 2021-07-07 | Utilisation d'ester de dialkylène glycol pour augmenter la résistance à l'oxydation d'une composition lubrifiante |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230250353A1 (fr) |
| EP (1) | EP4179048A1 (fr) |
| CN (1) | CN115836119A (fr) |
| FR (1) | FR3112349B1 (fr) |
| WO (1) | WO2022008603A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025132971A1 (fr) | 2023-12-20 | 2025-06-26 | Infineum International Limited | Compositions lubrifiantes contenant des antioxydants à base de diphénylamine à substitution aralkyle |
| WO2025132945A1 (fr) | 2023-12-20 | 2025-06-26 | Infineum International Limited | Compositions lubrifiantes contenant un antioxydant diphénylamine substitué par aralkyle |
| WO2025132964A1 (fr) | 2023-12-20 | 2025-06-26 | Infineum International Limited | Compositions lubrifiantes contenant un antioxydant diphénylamine disubstitué en c8 |
| WO2025153675A1 (fr) * | 2024-01-17 | 2025-07-24 | Totalenergies Onetech | Utilisation de composés diester comme additifs détergents dans une composition lubrifiante pour système de motorisation |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5665686A (en) * | 1995-03-14 | 1997-09-09 | Exxon Chemical Patents Inc. | Polyol ester compositions with unconverted hydroxyl groups |
| TWI250204B (en) * | 2001-04-06 | 2006-03-01 | Nippon Mitsubishi Oil Corp | Oil for very small amount oil supply type cutting-grinding operation and sliding face, and very small amount oil supply type cutting-grinding method using it |
| US7517838B2 (en) * | 2002-08-22 | 2009-04-14 | New Japan Chemical Co., Ltd. | Lubricating oil for bearing |
| US7871967B2 (en) * | 2007-02-12 | 2011-01-18 | Chevron U.S.A. Inc. | Diester-based lubricants and methods of making same |
| EP3124579A1 (fr) * | 2015-07-31 | 2017-02-01 | Total Marketing Services | Composition de lubrifiant contenant des diesters ramifiés et agent améliorant l'indice de viscosité |
| DE102017012207B4 (de) * | 2017-08-01 | 2022-11-10 | deconta GmbH | Anschlussvorrichtung zum Anschluss an einen Arbeitsraum |
| FR3069864B1 (fr) | 2017-08-03 | 2019-08-16 | Total Marketing Services | Composition lubrifiante comprenant un diester |
-
2020
- 2020-07-09 FR FR2007286A patent/FR3112349B1/fr active Active
-
2021
- 2021-07-07 CN CN202180048405.0A patent/CN115836119A/zh active Pending
- 2021-07-07 US US18/015,132 patent/US20230250353A1/en not_active Abandoned
- 2021-07-07 WO PCT/EP2021/068857 patent/WO2022008603A1/fr not_active Ceased
- 2021-07-07 EP EP21739701.7A patent/EP4179048A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US20230250353A1 (en) | 2023-08-10 |
| WO2022008603A1 (fr) | 2022-01-13 |
| CN115836119A (zh) | 2023-03-21 |
| FR3112349A1 (fr) | 2022-01-14 |
| FR3112349B1 (fr) | 2023-06-16 |
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