Carbodiimide as an additive in lubricants for engine systems to improve compatibility with elastomers

Abstract

Carbodiimide as additive in lubricants for powertrain systems to improve compatibility with elastomers The present invention relates to a lubricating composition for a powertrain system, comprising at least one or more base oils, at least one carbodiimide additive and at least one basic organic additive improving TBN; as well as a method for lubricating a powertrain system using such a lubricating composition. It also relates to the use of at least one carbodiimide additive in a lubricating composition for a powertrain system, to improve its compatibility with elastomers.

Description

Description Title of the invention: Carbodiimide as an additive in lubricants for engine systems to improve the compatibility with elastomers technical field

[0001] = The present invention relates to the field of lubricating compositions, in particular lubricating compositions for the lubrication of engine systems mobile or stationary. It relates more specifically to the use of carbon- diimides as additives in lubricating compositions to improve their com- compatibility with elastomers, in particular with elastomeric materials for seals present at the level of the motorization systems.

[0002] …— Advantageously, the invention notably improves compatibility with lubricant elastomers using one or more gold additives basic organic compounds improving the total basc index (TBN) of said composition. Previous technique

[0003] Lubricating compositions, also called "lubricants", are commonly implemented in engines primarily for the purpose of reducing forces friction between the different moving metal parts in the engines. They are also effective in preventing premature wear and tear or even endo- management of these rooms, and in particular their surface area.

[0004] To achieve this, a lubricating composition is conventionally composed of an oil of base to which are generally associated several additives dedicated to stimulating the per- lubricating properties of the base oil, such as modifying additives friction reducers, but also to provide additional performance.

[0005] — In fact, lubricants intended for the lubrication of engines, for example gas engines, particularly hydrogen or natural gas engines, or dual-fuel engines (for example, dual-fuel (gasoline / gasoline or gas / diesel) engines) must meet several requirements requirements, they must therefore combine good anti-wear, anti- corrosion, good detergent and dispersing properties to reduce formation of deposits.

[0006] — Internal combustion engines produce acidic by-products. These products acids can, for example, come from the combustion of fuel or impurities from the fuel or lubricant composition, causing the formation of sulfur oxides which, in the presence of water, are hydrolyzed into by-products acids. These acidic by-products have detrimental effects on the performance of the lu- engine blockage, as well as direct contact with the engine. They can, in particular, cause problems with corrosion, wear and deposits on the metal parts of the engine. It is therefore necessary that lubricants be able to neutralize these acidic substances, in order to reduce or even prevent the damage they can cause to the engine system. Detergents based on insoluble metallic salts, for example based on calcium or magnesium carbonate, have been commonly used to neutralize these by-products. However, these metallic detergents, for example based on phenolate and sulfonate, are ash-generating and therefore undesirable. In particular, the "low ash" (LOW SAPS) specifications, developed by the European Automobile Manufacturers' Association (ACEA), impose limit limits on the levels of sulfated ash (generated by the presence of metals), sulfur, and phosphorus in lubricant compositions, hence the name "Low SAPS" for "Low Sulfated Ashes, Phosphorus, Sulfur." ​​Indeed, sulfur, phosphorus, and sulfated ash can damage aftertreatment systems installed on vehicles. Ash, in particular, is harmful to diesel particulate filters (DPFs). It has therefore been proposed to implement, as an alternative to over-based metallic detergents, basic organic additives, which do not generate ash, capable of reacting with acids and neutralizing them. These basic organic additives thus increase the total base number (TBN) of the lubricant composition without affecting the sulfated ash content, in order to comply with the limits imposed for "Low SAPS" lubricants. They are also commonly referred to as "TBN boosters". The TBN, measured according to ASTM D2896, is a measure of the lubricant's basicity, and therefore its ability to neutralize the acidity developing in the lubricant during operation. It is expressed in milligrams of potassium hydroxide per gram of lubricating oil sample (mg KOH / g). In particular, amine additives, for example of the alkylated and aromatic amine type, which do not generate ash, have been proposed as an alternative to over-based metallic detergents. Unfortunately, this additive treatment of the lubricant with such basic organic additives, particularly amine additives, is likely to induce adverse effects on the compatibility of the lubricant with elastomers and, consequently, to lead to degradation of the materials of elastomeric seals, in particular fluoropolymer seals (Nersasian et al., Asle Transactions, volume 23, 4, 343-352). The degradation of the elastomer material of a seal can result, for example, in swelling, shrinkage, weakening of the seal, and can lead to seal failure, such as seal leaks, which impairs engine performance and can also damage the engine. Therefore, the quantity of such basic organic additives introduced must be closely controlled to ensure satisfactory compatibility and avoid impacting the elastomeric materials used in the powertrain system, for example, in the seals. Consequently, the increase in the lubricant's TBN (Total Beneficial Net) through the addition of such additives is limited by the quantity of basic organic additives, such as amines, that is acceptable to prevent significant seal degradation. To improve the compatibility of lubricating compositions with fluoropolymer seals, US document 2014 / 0315768 proposes, for example, an additive comprising at least one iodine atom, in particular an alkyl iodide such as iodododecane. However, the addition of such an additive does not allow for improved compatibility of the lubricant composition with respect to the different types of elastomers that can be used in the seals of engine systems, for example for gas engines or heavy-duty vehicle engines, with which the lubricant is in contact, particularly with respect to ethylene-acrylic elastomers. The present invention aims to propose a means to improve the compatibility of lubricants with the different elastomers that can be used in the seals of the motorization systems with which the lubricant is in contact, in particular in the context of the formulation of lubricants incorporating basic organic additives, in particular amines, implemented to increase the TBN of the lubricant. Carbodiimides are known as anti-hydrolysis agents in the formulation of rubber-type and plastic materials, particularly for thermoplastic polyesters, polyamides and polyurethanes. Furthermore, in the field of lubricants, US document 5,614,483 describes the implementation of carbodiimides as stabilizing additives in a lubricating base containing ester groups to prevent hydrolytic decomposition. Carbodiimides have also been proposed to improve the oxidation stability, rust resistance, or corrosion resistance of lubricants. For example, US patent 3,346,496 proposes the use of carbodiimides as antioxidants and corrosion inhibitors, in combination with diphenylamine or hydroquinoline antioxidants. Document WO 00 / 22074 proposes combining an acidic anti-rust additive and a acid deactivator such as a carbodiimide, to formulate a lubricating oil with improved oxidation stability and anti-rust performance. Document EP 0 992 571 further describes the implementation of a carbodiimide with a specific N-phenyl-naphthyl amine to improve the oxidation stability of mineral oils. We can also cite document EP 2 290 043 which describes the implementation of a liposoluble carbodiimide in association with a metallic salt of dithiophosphoric acid, to improve the anti-corrosion properties of the lubricating composition. Also, US document 2006 / 0122077 describes the implementation of a carbodiimide, in combination with a carboxylic acid comprising 2 to 24 carbon atoms, to improve corrosion inhibition, lubrication and lead compatibility properties, in a composition for power transmissions. On the other hand, it has never been proposed to implement carbodiimide additives in order to increase the compatibility of a lubricant, intended for an engine system, with elastomers, in particular the elastomers of the seals present in engine systems. Description of the invention The present invention relates, according to a first aspect, to a lubricating composition intended for a motorization system, comprising at least: - one or more base oils; - at least one carbodiimide additive; and - at least one basic organic additive improving the total base index of said composition, in particular of the polyalkylamine type. The basic organic additive(s), known as "TBN booster", used in a lubricating composition according to the invention, make it possible to increase the total base index as defined above, noted TBN, of the composition; in other words, they are able to neutralize acids from, for example, the combustion of gases or by-products of chemical decomposition, and allow access to improved detergency performance. Preferably, the said "TBN booster" additive(s) have a base number, called BN (for "Base number" in Anglo-Saxon terminology), measured according to the ASTM D2896 standard, greater than 10 mg KOH / g and up to 1200 mg KOH / g of additive, in particular greater than or equal to 50 mg KOH / g of additive and more particularly greater than or equal to 100 mg KOH / g of additive. Preferably, the aforementioned "TBN booster" additive(s) are chosen from: (a) polyalkylamine additives; (b) ionic liquid additives based on guanidinium, ammonium or phosphonium; (c) additives produced by the reaction between at least: . a hydroxybenzoic acid, optionally substituted with a hydrocarbon group; or an alkali or alkaline earth metal salt thereof, optionally superbased; . a boron compound; and an amino compound; and their mixtures. Examples of these "TBN booster" additives are detailed further in the text. According to a particular embodiment, the said "TBN booster" additive(s) are selected from polyalkylamines. Such a lubricating composition advantageously offers improved compatibility with elastomers, particularly with the elastomers of the seals present in the engine systems, with which it is intended to come into contact. In fact, as illustrated in the examples that follow, the inventors discovered that it is possible, by supplementing a lubricant, in particular comprising one or more basic organic additives, especially of the polyalkylamine type, used to increase the TBN of the lubricant, with a carbodiimide additive, to significantly improve the compatibility of the lubricant with elastomers and, in particular, to advantageously reduce / limit the adverse effects associated with the use of said basic organic additives "TBN booster". The invention thus relates, according to another of its aspects, to the use of at least one carbodiimide additive in a lubricating composition intended for a motorization system, in particular in a lubricating composition comprising at least one basic organic additive improving the TBN, to improve its compatibility with elastomers, in particular with the elastomers of the seals of the motorization system with which the lubricating composition is intended to come into contact. As shown in the examples, the compatibility of elastomers can be assessed according to the CEC L-112-16 standard, common for heavy-duty diesel engines and gas engines, which references compatibility on four different types of elastomer: "RE6" for a fluoroelastomer, "RE7" for a polyacrylate, "RE8" for a nitrile and "RE9" for an ethylene acrylic. This compatibility results in an absence of physical or chemical alteration of the elastomer and therefore in the maintenance of the tensile / friction coefficients and elongation at break at satisfactory levels. Advantageously, the addition of the carbodiimide additive improves the lubricant's compatibility, not only with fluoropolymer elastomers, but also with all types of elastomers considered according to this standard and which can be exposed to lubricant within the motorization system. Advantageously, the possibility of increasing the compatibility of the lubricant through the addition of a carbodiimide additive according to the invention allows the implementation in the lubricant of basic organic additives, free of ash, in particular of amine additives as described in the rest of the text, in particular in quantities greater than those which can be considered in the absence of a carbodiimide additive, without negatively impacting the compatibility properties of the lubricant with elastomers. The invention further relates to a process or method for improving the compatibility with elastomers, in particular with seals, of a lubricating composition intended for a motorization system, in particular of a lubricating composition implementing one or more basic organic additives improving the TBN of the lubricant, preferably one or more polyalkylamines, comprising the addition to said composition of at least one carbodiimide additive. The implementation of a carbodiimide additive according to the invention, in association with one or more basic organic additives, thus makes it possible to overcome the harmful effect of the latter on the compatibility of the lubricant with elastomers, and thus to reduce the damage of the lubricant on the elastomeric material of the seals. The invention thus advantageously makes it possible to formulate a lubricant comprising an increased content of basic organic ash-free additives, in particular polyalkylamines, without altering the compatibility of the lubricant with elastomers, in particular seal elastomers. By taking advantage of the implementation of basic organic compounds as "TBN booster" additives, instead of conventional metallic detergents, which generate ash, it is possible to obtain a lubricant with a high total base index TBN, particularly suited to the desired use for the lubricant, while maintaining a low ash content. A lubricating composition according to the invention can thus combine a high TBN, a low ash content, particularly sulfated ash, and good compatibility properties with elastomers. In particular, a lubricating composition according to the invention may advantageously exhibit a TBN, measured according to ASTM D2896, of at least 1 mg KOH / g of lubricating composition, in particular of at least 2 mg KOH, especially of at least 3 mg KOH per gram of lubricating composition. A lubricating composition according to the invention may advantageously have a low sulfated ash content. In particular, the sulfated ash content of a lubricating composition according to the invention may be less than or equal to 1.3% by mass, in particular less than or equal to 1% by mass, more particularly in- less than or equal to 0.8% by mass, relative to the total mass of said lubricating composition. The sulfated ash content may be measured according to ASTM D874. The invention relates, according to another of its aspects, to a process or method for increasing the TBN of a lubricating composition intended for a motorization system, in particular a low ash lubricating composition, without impacting the ash content of said composition or its compatibility with elastomers, comprising the addition to said lubricating composition of at least one basic organic additive improving the TBN, in particular at least one polyal- alkylamine type additive, in association with at least one carbodiimide additive. The lubricants considered according to the invention, exhibiting improved compatibility with elastomers, can be used for various motorization systems, mobile or stationary, in particular for motorization systems comprising one or more elastomeric materials, including elastomeric seals, with which the lubricant is brought into contact. For the purposes of this invention, "powertrain system" means a system comprising all the mechanical parts necessary for the intended mobile or stationary application and including at least one engine, in particular an internal combustion engine. This may be a combustion, gas (including hydrogen), ammonia, electric, or hybrid (dual fuel) powertrain system, for example, dual fuel (gas / gasoline or gas / diesel), depending on the nature of the engine(s) included in the powertrain system: combustion, gas (including hydrogen), ammonia, and / or electric. A "mobile" motorization system is more specifically a motorization system implemented in vehicles, including light vehicles, heavy goods vehicles, so-called "off-road" mobile machines or even marine vehicles. A mobile motorization system thus corresponds more specifically to the propulsion system of a vehicle. For the purposes of this invention, a "propulsion system" is defined as a system comprising the mechanical parts necessary for propelling a vehicle. More specifically, the propulsion system includes an engine, a transmission, and possibly a battery. The battery itself generally consists of a set of electrical accumulators, called cells. A "stationary" drive system, as defined in the invention, is a drive system including a stationary engine. It can find applications, for example, in electrical power generation devices. In particular, it may be a gas-powered drive system, especially a stationary gas engine. Advantageously, the lubricating composition considered according to the invention is implementation for a gas engine system, including biogas engine systems, in particular for natural gas engines (liquefied natural gas (LNG) or compressed natural gas (CNG), hydrogen engines or dual-fuel engines, for which it is imperative to control both the ash content and the TBN. This could be a lubricating composition for a four-stroke engine system, particularly for heavy-duty or marine four-stroke engines. According to a particular embodiment, the lubricant considered according to the invention is intended for a four-stroke engine operating on gas, in particular hydrogen or natural gas. The invention also relates, according to another of its aspects, to a process or method of lubricating a motorization system, in particular as described above, comprising a step of bringing at least one mechanical part of said system into contact with a lubricating composition as defined above. Other features, variations and advantages of implementing a carbodiimide additive according to the invention will become clearer from reading the description and examples that follow, given by way of illustration and not limitation of the invention. In the following text, the expressions "between … and …", "ranging from … to …" and "varying from … to …" are equivalent and are meant to mean that the boundaries are included, unless otherwise stated. In the context of the invention, the following definitions apply: - "alkyl", a saturated aliphatic group, linear or branched; for example, a C, a C alkyl represents a saturated carbon chain of x to z carbon atoms, linear or branched; - "Cycloalkyl", a cyclic alkyl group, for example a C, to C cycloalkyl; represents a cyclic carbon group of x to z carbon atoms, for example a cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl; - "aryl", a mono- or polycyclic aromatic hydrocarbon group, in particular comprising between 6 and 10 carbon atoms. Examples of aryl groups include phenyl and naphthyl groups; - "aralkyl", an aryl group as defined above, substituted by at least one alkyl group as defined above. The aralkyl group may be linked to the rest of the molecule by the aryl or alkyl part of the radical. - "alkylene", a divalent radical, preferably saturated, linear or branched, derived from a hydrocarbon by the removal of two hydrogen atoms from distinct carbon atoms. For example, a C,-Cz-alkylene group represents a saturated carbon chain, linear or branched, of 1 to 3 carbon atoms, for example, methylene, ethylene, 1-methylethylene or propylene; - "alkenyl", an aliphatic group, linear or branched, mono- or polyunsaturated; for example containing one or two ethylenic unsaturations; - "hydrocarbon", a compound or a fragment of a compound selected from: an alkyl, an alkenyl, an aryl, an aralkyl. Hydrocarbon groups may, where appropriate, include heteroatoms. Detailed description CARBODIIMIDE ADDITIVE As previously stated, the invention is based on the implementation, in a lubricant for a motorization system, of one or more carbodiimide additives, to improve the compatibility of the lubricant with elastomers. It is understood that the invention may implement a single carbodiimide additive or a mixture of at least two distinct carbodiimide additives, in particular two, three or more distinct carbodiimide additives, in particular as defined below. The term "carbodiimide additive" refers to an additive comprising at least one motif -N=C=N-. The carbodiimide additive considered according to the invention can be a so-called "mono-carbodiimide" additive comprising a single carbodiimide motif, or a so-called "poly-carbodiimide" additive comprising at least two carbodiimide motifs. Preferably, the carbodiimide additives used according to the invention are of the following formula (I): X-(-N=C=NY),N=C=NY (D in which: X and Ÿ represent, independently of each other, a hydrocarbon radical, saturated or unsaturated, linear, branched or cyclic, aromatic or non-aromatic, possibly substituted, preferably comprising from 6 to 60 carbon atoms, in particular from 8 to 20 carbon atoms, and more particularly from 9 to 15 carbon atoms; and q is equal to 0 or is an integer from 1 to 100, in particular from 1 to 50 and more particularly from 1 to 40. The said radicals X and Y, preferably aromatic, may have aromatic, aliphatic and / or cycloaliphatic substituents, preferably at least in ortho position relative to the carbodiimide group, for example alkyl groups comprising at least two carbon atoms. According to a particular embodiment, the carbodiimide additive considered according to the invention is a mono-carbodiimide. It corresponds more specifically to the aforementioned formula (I) in which q equals 0. In other words, the carbodiimide additive considered according to the invention can have the following formula (D): XN=C=NY (1'), in which X and Y are as defined previously. In particular, X and Y, identical or different, in particular identical, may represent a phenyl group, preferably substituted at at least one of the ortho positions relative to the carbodiimide function, preferably at both ortho positions, and optionally in the para position relative to the carbodiimide function, by a group selected from aliphatic, linear, branched or cyclic groups, substituted or unsubstituted, saturated or unsaturated, and aromatic groups substituted or unsubstituted, said aliphatic and / or aromatic groups preferably comprising from 2 to 20 carbon atoms. In other words, X and Ÿ in the aforementioned formula (l'), whether identical or different, particularly if identical, can represent radicals of the formula: [Chem.3] R4 AR 7) ° Ra in which: # represents the nitrogen atom binding site of the carbodiimide function; at least one of the Rs, and Ra represents an aliphatic, linear, branched or cyclic group, substituted or unsubstituted, saturated or unsubstituted, or an aromatic group, substituted or unsubstituted, preferably comprising from 2 to 20 carbon atoms; the other of the Rs, and R; represents a hydrogen atom, an aliphatic group, linear, branched or cyclic, substituted or unsubstituted, saturated or unsaturated, or an aromatic group, substituted or unsubstituted, preferably comprising from 2 to 20 carbon atoms; and Ry represents a hydrogen atom, an aliphatic group, linear, branched or cyclic, substituted or unsubstituted, saturated or unsaturated, or an aromatic group, substituted or unsubstituted, preferably comprising from 2 to 20 carbon atoms; said aromatic group being optionally condensed with the supporting phenyl ring. Preferably, at least one of the R, and R>, in particular R, and Ra, identical or different, represents an alkyl group, linear or branched, in C; to C,,, such as ethyl, propyl, isopropyl, butyl, tert-butyl groups; a cycloalkyl group in C; to Ca, for example a cyclohexyl group; or an aryl or aralkyl group comprising 6 to 15 carbon atoms, such as a phenyl, tolyl, benzyl group. According to a particularly preferred embodiment, R and Ra, whether identical or different, particularly identical, represent branched alkyl groups from C1 to C2, particularly from C3 to C5, especially from C1 to C5, such as isopropyl groups. Preferably, Rs represents a hydrogen atom or a branched alkyl group from C1 to C2, particularly from C3 to C5, especially from C3 to C5, such as an isopropyl group; more preferably, Rs represents a hydrogen atom. According to a particular embodiment, the carbodiimide additive implemented according to the invention corresponds to the following formula (l'a): [Chem.4] (Born M Ro N=C=FN FH we 1N {+ d'a) in which the R groups, identical or different, and the R groups, identical or different, are such as defined previously, in particular represent C-branch alkyl groups; at C5, preferably isopropyl groups. As an example, the carbodiimide additive can be chosen from the N,N'-bis(2,6-diisopropylphenyl)carbodiimide, N,N'-bis(2,4,6-triisopropylphenyl)carbodiimide and their mixtures. According to a particular preferred embodiment, the carbodiimide additive is N,N'-bis(2,6-diisopropylphenyl)carbodiimide. Carbodiimide additives can also be selected from carbodiimide dimers, oligomers, and polymers, known as "polycarbodiimide" additives. Such polycarbodiimide additives correspond more specifically to the aforementioned formula (I), in which q is greater than or equal to 1, and the X and Y groups can be as defined previously for monocarbodiimides. The carbodiimide additives implemented according to the invention, preferably mono-carbodiimides, can be commercially available or prepared according to synthesis methods known to those skilled in the art. The said carbodiimide additive(s) are advantageously implemented in a sufficient content to achieve the desired effect in terms of lubricant compatibility with elastomers, in particular to meet the required specifications for the lubricant in terms of compatibility with elastomers, for example as evaluated according to CEC L-112-16. The quantity of carbodiimide additive(s) used varies particularly depending on the nature of the lubricant, and more specifically on the nature and quantity of basic organic additives, particularly amine additives, present in the lubricant and likely to negatively affect the compatibility of the lubricant with elastomers. The said carbodiimide additive(s) can thus be advantageously implemented in an adjusted quantity to mitigate / compensate for the adverse effect associated with the implementation of basic organic additives, in particular as described later in the text, on the compatibility of the lubricant with elastomers. In general, the carbodiimide additive(s) considered according to the invention, in particular as defined above, can be implemented at a rate of 0.1 to 8% mass of commercial product, in particular 0.5 to 5% mass and more particularly 1 to 3% mass of commercial product, relative to the total mass of said lubricating composition. According to a particular embodiment, a lubricating composition according to the invention may comprise from 0.01 to 0.8% by mass of carbodiimide active matter, in particular from 0.05 to 0.5% by mass and more particularly from 0.1 to 0.3% by mass of carbodiimide active matter, relative to the total mass of said lubricating composition. The mass content of active matter of carbodiimide means to designate the mass content of said carbodiimide compound, without any compounds, in particular solvents, with which it is formulated. LUBRICANT COMPOSITION A lubricating composition as considered according to the invention comprises one or more base oils, as well as other additives conventionally considered in lubricating compositions. It is understood that the nature and quantity of the other compounds are adapted with regard to the purpose of the lubricant, and more particularly with regard to the type of engine system for which it is intended, for example depending on whether it is intended for use in a vehicle engine, a marine engine, etc. Base oil Conventionally, a lubricating composition comprises one or more base oils. These base oils can be chosen from among the base oils conventionally used in the field of lubricating oils, such as mineral, synthetic or natural, animal or vegetable oils or mixtures thereof. It can be a mixture of several base oils, for example a mixture of two, three, four, or even more than four base oils. The base oils of the lubricating compositions considered according to the invention may in particular be oils of mineral or synthetic origin belonging to groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) and presented in the table below or their mixtures. [Table 1] ea Viscosity index curvature | Saturated fat content | Sulfur content | {Vp < 30% > 9.035% 80 <VI < 120 290 <0.03% Sure <VI<120 —j— hydrocraquées | 290% 0,03 % > 120 Grouping! Mineral oils Group IT Hydrocracked oils Group IH Hydrocracked or hydro-isomerized oils RE RE VOS NE PER RE EEE 4 | Group IV Polyalphacefins (PAO) | Group V Esters and other bases not included in groups I to IV | Mineral base oils include all types of base oils obtained by atmospheric and vacuum distillation of burnt petroleum, followed by refining operations such as solvent extraction, desalpha removal, solvent dewaxing, hydrotreating, hydrocracking, hydroisomerization and hydrofinishing. Synthetic base oils can be esters of carboxylic acids and alcohols, polyalphaolefins, or polyalkylene glycols (PAGs) obtained by polymerization or copolymerization of alkylene oxides containing 2 to 8 carbon atoms, particularly 2 to 4 carbon atoms. Polyalphaolefins used as base oils are, for example, obtained from monomers containing 4 to 32 carbon atoms, such as decene, octene, or dodecene, and have a viscosity at 100°C between 1.5 and 15 mm·s⁻¹ according to ASTM D445. Their average molecular weight is generally between 250 and 3000 according to ASTM D5296. Mixtures of synthetic and mineral oils, which may be bio-based, can also be used. There are generally no limitations on the use of different base oils. The only difference in the lubricating composition is that the components must have properties, measured according to applicable standards, such as viscosity, viscosity index, sulfur content, or oxidation resistance, suitable for use in powertrain systems, for example, vehicle engines. In one particular embodiment, a lubricating composition according to the invention comprises at least one mineral base oil (Group I). In another particular embodiment, a lubricating composition according to the invention comprises at least one base oil selected from Group II, III, and IV oils of the API classification, and mixtures thereof, in particular at least one Group III base oil. A lubricating composition considered according to the invention may comprise at least 50% by mass of base oil(s) relative to its total mass, in particular at least 60% by mass of base oil(s), and more particularly between 70 and 99% by mass of base oil(s). ADDITIVES Basic organic additive "TBN booster" As previously stated, the implementation of one or more carbo-diimide additives according to the invention proves particularly advantageous to counter the adverse effect associated with the implementation of basic organic additives improving TBN, known as "TBN booster", in particular amine additives, on the compatibility of the lubricant with elastomers. The lubricating composition considered according to the invention, supplemented by one or more carbodiimide additives, in particular as defined above, may thus advantageously comprise one or more basic organic additives capable of increasing the TBN of the lubricating composition, in particular one or more amine additives. Basic organic additives known as "TBN boosters" are familiar to those skilled in the art. These additives have the advantage of generating little to no ash, unlike metallic detergents. They are also referred to as "ashless" compounds or additives. Preferably, the "TBN booster" additives implemented according to the invention have a base number, called BN (for "Base number" in Anglo-Saxon terminology), measured according to the ASTM D2896 standard, greater than 10 mg KOH / g and up to 1200 mg KOH / g of additive, in particular greater than or equal to 50 mg KOH / g of additive and more particularly greater than or equal to 100 mg KOH / g of additive. Advantageously, by implementing one or more carbodiimide additives according to the invention, the quantity of said basic organic additive(s) improving TBN, in particular by amine additive(s), for example of polyalkylamine type, as described in the rest of the text, which can be incorporated into said lubricating composition, is not limited with regard to considerations of incompatibility of said bases with respect to elastomers. Therefore, the quantity of basic organic additives, in particular amine additives, for example of the polyalkylamine type, can be adjusted to achieve the desired TBN for the lubricating composition. The target TBN value may vary depending on the intended application for the lubricant. Advantageously, the presence of at least one carbodiimide additive thus makes it possible to consider the implementation of an increased quantity of basic organic additive(s) without impacting the compatibility of the lubricant with elastomers, in order to obtain a lubricant with the desired TBN, and thus to reduce the presence of undesirable metallic detergents given the ash they generate. In particular, the said basic organic additive(s) "TBN booster", in particular amines, for example of the polyalkylamine type, may be used in a content greater than or equal to 0.1% by mass, relative to the total mass of said lubricating composition, in particular in a content between 0.1 and 10% by mass, more particularly between 0.5 and 7% by mass, preferably between 1 and 5% by mass. Preferably, the said basic organic additive(s) "TBN booster", in particular amines, for example of the polyalkylamine type, can be implemented in such a content that their presence, at the level of the lubricating composition, contributes to at least | mg of KOH / g of the total TBN of said composition, in particular from | to 40 mg of KOH / g, in particular from 1 to 15 mg of KOH / g, in particular at least 3 mg of KOH / g of the TBN of the lubricating composition. In particular, the said basic organic additive(s) "TBN booster", in particular amines, for example of the polyalkylamine type, may be implemented in a content such that the BN of the said basic organic additive(s) represents at least 3%, in particular at least 5% and preferably 10 to 50% of the TBN of the lubricating composition. According to a particular embodiment, the basic organic additive(s) "TBN booster", in particular amines, for example of the polyalkylamine type, and the carbodiimide compound(s) are present in a lubricating composition according to the invention in a TBN booster / carbodiimide mass ratio greater than or equal to 0.3, in particular greater than or equal to 0.8 and more particularly between 1 and 10. The aforementioned basic organic additive(s) "TBN booster" implemented in a compositions according to the invention may preferably be chosen from: (a) polyalkylamine additives, in particular as described in the following text; (b) ionic liquid additives based on guanidinium, ammonium or phosphonium, in particular as described in the following text; (c) additives produced by the reaction between at least: . a hydroxybenzoic acid, optionally substituted with a hydrocarbon group; or an alkali or alkaline earth metal salt thereof, optionally superbased; . a boron compound; and . an amine compound, in particular as described later in the text; and mixtures thereof. In particular, the "TBN booster" additives considered according to the invention are not amine antioxidant additives, especially aromatic amine-type antioxidant additives. Aromatic amine-type antioxidants are generally of the formula NR®R°R"° in which R* represents an aliphatic or aromatic group, possibly substituted, R° represents an aromatic group, possibly substituted, R'° represents a hydrogen atom, an alkyl group, an aryl group, or a group of the formula RYS(O)R" in which R'! represents an alkylene or alkenylene group, R'? represents an alkyl, alkenyl, or aryl group, and z represents 0, 1, or 2. It is understood that a lubricating composition according to the invention may comprise a single basic organic additive "TBN booster" or a mixture of at least two basic organic additives "TBN booster", in particular two, three or more basic organic additives "TBN booster", in particular chosen from the amine compounds detailed in the following text. (a) Polyalkylamine additives The basic organic additives "TBN booster" implemented in a lubricating composition according to the invention may more particularly include polyalkylamine type additives. According to a particular embodiment, a lubricating composition according to the invention comprises at least one polyalkylamine-type additive, more particularly selected from dialkylene triamines and trialkylene tetramines. The polyalkylamine additives may more particularly have the following formula (IT): [Chem.5] li pe N-A1—FNH—A2——N =, RC + m R (I) in which: R4 and Rs represent, independently of each other, a hydrogen atom or an alkyl or alkenyl group, linear or branched, in particular comprising from 1 to 22 carbon atoms: Rç and R7 represent, independently of each other, an alkyl or alkenyl group, linear or branched, in particular comprising from 1 to 30 carbon atoms, in particular from 1 to 22 carbon atoms: A1 and A2 represent, independently of each other, an alkylene group at C, at Ce, in particular at C, at C, especially at C, at C; preferably Al and A2 represent propylene groups —(CH)>-; and m is equal to 0, 1, 2 or 3; preferably m is equal to | or 2. Preferably, A1 and A2 are identical. In particular, they can represent methylene (-CH2-), ethylene (-CH2-CH2-), methylethylene (-CH2-CH(CH2)- or -CH(CH2)-CH2-), or propylene (-(CH2);-) groups. Preferably, A1 and A2 represent propylene (or trimethylene) -(CH2)+- groups. Preferably, R4 and Rs are identical. In particular, R4 and Rs can represent hydrogen atoms. According to a particular embodiment, the polyalkylamine additive may have formula (II) in which: - R4 and Rs represent hydrogen atoms; and - Rs and Ry, identical or different, represent alkyl groups, linear or branched, comprising from 8 to 22 carbon atoms, preferably from 14 to 18 carbon atoms and more preferably from 16 to 18 carbon atoms. According to another embodiment, the polyalkylamine additive may be of formula (II) in which: - R4 and Rs represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, at C, to C5, in particular at C, to C;, notably a methyl group; preferably R, and Rs, identical, represent hydrogen atoms or methyl groups; preferably R, and Rs, identical, represent hydrogen atoms; - Rs and Ry represent, independently of each other, an alkyl group, linear or branched, at C, to C5, in particular at C, to C;, notably a methyl group; preferably Rç and Ry, identical, represent methyl groups. According to a particular embodiment, a lubricating composition according to the invention may comprise at least one polyalkylamine additive of the aforementioned formula (IT) in which m is 1 and A1 and A2 are propylene groups. In particular, the polyalkylamine additive may have the following formula (II-a): [Chem.6] Re / R, NDS RG (He has) in which: R4 and Rs represent, independently of each other, a hydrogen atom or an alkyl group at C, to C5, in particular at C, to C3 and more particularly a methyl group; preferably, R, and Rs are identical and more preferably represent hydrogen atoms or methyl groups; and even more preferably R, and Rs are identical and represent hydrogen atoms; Rs and Ry represent, independently of each other, an alkyl group at C, at Ce, particularly at C, at C; and more particularly a methyl group; preferably Rs and R are identical and more preferentially represent methyl groups. As an example, we can cite N,N-dimethyldipropylene triamine (DMAPAPA) (CAS: 10563-29-8) and N,N,N',N'-tetramethyldipropylene triamine (TMDPT) CAS: 6711-48-4). According to another particular embodiment, a lubricating composition according to the invention may comprise at least one polyalkylamine additive of the aforementioned formula (II) in which m is 2 and A1 and A2 are propylene groups. In particular, the polyalkylamine additive may have the following formula (II-b): [Chem.7] Rey Ra 1 pa 7 Rs (Hb} in which: R4 and Rs represent hydrogen atoms; and Rs and Ry represent, independently of each other, an alkyl group in Cz to C2, preferably in C,; in Cyr and more preferably in Cy5 to Cjs. As an example, one can cite the compound name IUPAC N°-{3-[(3-aminopropyl)amino]propyl}-N,N-di-C16- C18 (evennumbered) alkyl propane-1,3-diamine (CAS 1623405-26-4). Other polyalkylamine additives may also be considered. The lubricating composition according to the invention may thus comprise a mixture of polyalkylamines incorporating one or more branched polyalkylamines, as described in the request WO 2017 / 148816. In particular, the lubricating composition according to the invention may incorporate one or more polyalkylamines selected from the following polyalkylamines of formula (III) or (IV): [Chem.8] NH2 OX NS (qi BE A0 GA Et NAT / p > ANR fe k #e EE R7 SSSR of n H n av in which: Rs and R7 are as defined previously; in particular they represent, independently of each other, an alkyl or alkenyl group, linear or branched comprising from 8 to 22 carbon atoms, in particular from 14 to 18 carbon atoms and more particularly from 16 to 18 carbon atoms; net z represent, independently of each other, 0, 1, 2 or 3; and when z is different from 0, 0 and p are, independently of each other, 0, 1, 2 or 3; and derivatives of these. Polyalkylamine derivatives correspond more specifically to polyalkylamines of formula (III) or (IV) in which one or more NH functions are methylated and / or alkoxylated. In particular, a composition according to the invention may implement at least one branched polyalkylamine of formula (IIT) or (IV), that is to say, of formula (IIT) in which at least one of n and z is greater than or equal to 1, or of formula (IV) in which n is greater than or equal to 1. According to a particular embodiment, the lubricating composition comprises a mixture of polyalkylamines of formula (III) and / or (IV) of which at least 3% by mass, in particular at least 5% by mass, in particular at least 10% by mass and more particularly at least 20% by mass, of branched polyalkylamines of formula (II) and / or (IV), relative to the total mass of the mixture of polyalkylamines of formula (III) and (IV). (b) Ionic liquids According to a particular embodiment, a lubricating composition according to the invention may include, as basic organic additives "TBN booster", one or more ionic liquid type additives selected from guanidinium-based ionic liquids, ammonium-based ionic liquids, phosphonium-based ionic liquids and mixtures thereof. Such additives are described in particular in application WO 2020 / 216655 and in applications filed under numbers EP 20315181.6, EP 20315180.8 and EP 20315182.4. Ionic liquid additives based on guanidinium may be more particularly of the following formula (V): [Chem.9] [CAT IX] (W) in which [CAT,*] represents a guanidinium ion and [Xy] represents one or more anionic species. Preferably, [CAT),*] represents a cation of formula (Va): [Chem.10] R1 1 R2 NN well | R5 R4 (Va) in which: R1 and R2 are chosen, independently of each other, from among a hydrogen atom, an alkyl group, linear or branched, in C,-C3p, a cycloalkyl group in C;-C;, an aryl group in Cs-C;2, or an aralkyl group in Cz-C,2, optionally substituted by a functional group comprising an oxygen and / or nitrogen atom; R3, R4, R5, R6 are chosen, independently of each other, from an alkyl group, linear or branched, in C,-C;9, a cycloalkyl group in C;-C;, an aryl group in C;-C,z Or an aralkyl group in C,-C;, optionally substituted by a functional group comprising an oxygen and / or nitrogen atom; or two of (R3,R4) or (R5,R6) together form a methylene chain (CH»)p1- with p, an integer from 2 to 5. According to a particularly preferred embodiment, in formula (Va), - RI and R2 represent, independently of each other, a hydrogen atom or an alkyl group, linear or branched, in C,-C, in particular in C,-C; and in particular methyl or ethyl. Preferably, R1=R2. - R3, R4, RS and R6 are chosen, independently of each other, from alkyl groups, linear or branched, in C,-Ce, in particular in C,-C; and in particular methyl and ethyl groups. Preferably, R3=R4=R5=R6, and in particular represents -CH; or -CH,-CHs. Preferably, [CAT,*] is chosen from: [Chem.11] RER sf, se A N--CH, TO THIS PUS ii ÊR; C6 A, in, EM RE € 4 a” FES + Rae + + ËÏ th, Pat To CH, N Nu” We at £N, L on > es In formula (V), [Xy] represents a counter-ion compatible with the intended application according to the invention. In particular, [Xy"] may comprise one or more anions selected from among the halides, perhalides, pseudohalides, sulfates, sulfites, sulfonates, sulfonimides, phosphates, phosphites, phosphonates, methides, carboxylates, hydroxycarbylates, alkoxides, azolates, carbonates, carbamates, thiophosphates, thiocarbylates, thiocarbamates, thiocarbonates, xanthates, thiosulfonates, thiosulfates, nitrate, nitrite, perchlorate, halometalates, amino acids and borates. According to a particular embodiment, the counterion [Xy-] is selected from: a) Ra-COO- carboxylates, with Ra selected from alkyl and alkenyl groups comprising from 1 to 30 carbon atoms, preferably from 6 to 15 carbon atoms; aryl groups comprising from 6 to 30 carbon atoms, preferably from 6 to 15 carbon atoms; aralkyl groups comprising from 7 to 30 carbon atoms, in particular from 7 to 20 carbon atoms, optionally substituted by a functional group comprising an oxygen and / or nitrogen atom. For example, [Xy-] can represent 2-ethylhexanoate. b) RaRbHCO- alkoxides with Ra selected from alkyl and alkenyl groups comprising 1 to 30 carbon atoms, aryl groups comprising 6 to 30 carbon atoms, aralkyl groups comprising 7 to 30 carbon atoms; Rb is selected from H, alkyl and alkenyl groups comprising 1 to 30 carbon atoms, aryl groups comprising 6 to 30 carbon atoms, aralkyl groups comprising 7 to 30 carbon atoms, optionally substituted by a functional group comprising an oxygen and / or nitrogen atom. Preferably, [X,] is chosen from alkyl phenolates, in particular comprising 7 to 20 carbon atoms; aminophenolates, in particular in which the amine group is substituted by at least one alkyl group comprising 1 to 18, in particular 2 to 12, carbon atoms; and mixtures thereof. For example, [X;] can represent tert-amylphenolate, isooctylphenolate, or dioctylamino phenolate. (c) Hydroxycarboxylates HO-Rc-COOY, with Rc a divalent radical selected from alkyl and alkenyl groups, comprising from 1 to 30 carbon atoms, in particular from 1 to 15 carbon atoms; aryl groups comprising from 6 to 30 carbon atoms, in particular from 6 to 15 carbon atoms; aralkyl groups comprising from 7 to 30 carbon atoms, in particular from 7 to 20 carbon atoms, optionally substituted by a functional group comprising an oxygen and / or nitrogen atom. For example, [X;] may represent 2-hydroxypropanoic acid. In a particularly preferred embodiment, [X;] is selected from: 2-ethylhexanoate, 2-hydroxypropanoate, ter-amylphenolate, isooctylphenolate, or dioctylaminophenolate. According to another variant, the guanidinium-based ionic liquid has the aforementioned formula (V), in which [CAT,*] represents 1,1,3,3-tetramethylguanidinium, of formula (Vb) [Chem.12] Ha +61 ST H,e A CH, SN NT CH, CH; (Vb) and [X,] represents one or more counterions chosen from the compounds of formula (VD [Chem 13] [Chem.13] R—A-0+y,-0+y,—0" Li (VD in which: - A represents an aryl group comprising 6 to 12 carbon atoms; in particular a phenyl or naphthyl group; - R! is chosen from a hydrogen atom, an alkyl or alkenyl group, linear or branched, comprising from 1 to 30 carbon atoms, an aryl group comprising from 6 to 30 carbon atoms: - Ÿ represents an alkylene group, linear or branched, comprising from 1 to 6 carbon atoms; and - N, represents an integer from 1 to 20, in particular from 1 to 15 and more particularly from 1 to 12, preferably from 4 to 12 and more preferably from 6 to 10. According to a preferred embodiment, [X;] corresponds to the formula (VIA): [Chem.14] m (VIA) S, “CL Frot fe in which: - R' is chosen from a hydrogen atom, an alkyl or alkenyl group, linear or branched, comprising from 1 to 30 carbon atoms and an aryl group comprising from 6 to 30 carbon atoms; R! can be in ortho, para or meta position, preferably in para position; - Y, is an alkylene group, linear or branched, comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms, and more preferably Y, is - CH--CH-- ; and - n, is an integer from 1 to 15, preferably from 1 to 12. Preferably, in formula (VI) or (VIA), R1 is selected from a hydrogen atom and a linear or branched alkyl or alkenyl group comprising from 1 to 30 carbon atoms, preferably from 1 to 24, in particular from 1 to 18 carbon atoms, more preferably from 1 to 12 carbon atoms; R1 being in the ortho, para, or meta position. Advantageously, R1 represents a linear or branched alkyl group comprising from 1 to 18 carbon atoms, in particular from 1 to 12 carbon atoms, R1 being preferably in the para position. For example, R! can be chosen from an isopropyl, n-propyl, iso-butyl, ter-butyl, n-butyl, tert-pentyl, n-pentyl, n-hexyl, tert-hexyl, n-heptyl, tert-heptyl, n-octyl, tert-octyl, 2-ethylhexyl, n-nonyl, tert-nonyl and dodecyl group. According to a preferred embodiment, [X;] responds to the formula (VIB): (VIB) [Chem.15] oo { SNS LS x dt mn He CH, CH, CH in which nl is between 4 and 10, in particular between 6 and 10. Advantageously, [Xy] is the tert-octylphenylpolyethoxyethanolate of formula (VIB) with nl = 8 or 9. Ammonium-based ionic liquid additives may more particularly be of the following formula (VII): [Chem.16] [CAT:}{X7-] (VI in which: [CAT] represents a tri-n-octylmethylammonium cation; and [Xz] represents one or more anionic species chosen from among the carboxylates of formula (VIIA): [Chem 17] [Chem.17] oO R « (VHA) in which R is an alkyl or alkenyl group, linear or branched, comprising from 2 to 8 carbon atoms; preferably a linear or branched alkyl group comprising from 2 to 8 carbon atoms, in particular from 4 to 8 carbon atoms and more particularly from 5 to 7 carbon atoms. According to a preferred embodiment, [X>] is 2-ethylhexanoate. According to a preferred embodiment, the ammonium-based ionic liquid is tri-n-octylmethylammonium 2-ethylhexanoate. Ionic liquid additives based on phosphonium may be more particularly of the following formula (VIII): [Chem.18] ICAT:]{X] (VID in which: [CAT+*] represents a phosphonium cation and [X3"] represents one or more anionic species. Preferably, [CAT,*+] is chosen from cations of formula (VIIIA): [Chem.19] R7 {+ R10—PR8 R9 (VHIA) in which: - R7, R8, R9 and R10 are hydrocarbon groups, linear or branched, saturated or unsaturated, comprising from 1 to 12 carbon atoms; - at least one of the groups R7, R8, R9, R10 is chosen from alkyl or alkenyl groups, linear or branched, in C, to C3; - at least two of the groups R7, R8, R9, R10 are chosen, independently of each other, from linear or branched alkyl or alkenyl groups, in C; to Cp. Advantageously, in formula (VIIIA), - R7 represents an alkyl or alkenyl group, preferably an alkyl group, linear or branched, at C, to C, ; and - R8, R9, R10 represent, independently of each other, alkyl or alkenyl groups, preferably linear or branched alkyl groups, in C; to Cy> ; preferably R7, R8 and R9 are identical and represent linear or branched alkyl groups in C; to C,>. Advantageously, in formula (VIIIA), R7 = -CH,, and R8 = R9 = R10 = CH, —(CH2),3-, with p3 representing an integer between 6 and 8; preferably R8 = R9 = R10 = CH,—(CH,),-. In formula (VIID), [X3] represents a counterion chosen from the compounds of formula (VIIB): [Chem.20] GOLD (HIV / HIV) in which R* is chosen from linear or branched alkyl or alkenyl groups comprising 5 to 7 carbon atoms. According to a particularly advantageous embodiment, [X3] represents 2-ethylhexanoate. According to a preferred embodiment, [CATy+] is tri-n-octyl methylphosphonium and [X7] is 2-ethylhexanoate. In other words, the phosphonium-based ionic liquid is tri-n-octyl methylphosphonium 2-ethylhexanoate. Ionic liquids based on guanidinium, ammonium, or phosphonium are preferably soluble in the base oil or oils used in the lubricating composition. A compound is said to be soluble in a base oil if it can be dissolved to a concentration of at least 0.01% by weight relative to the weight of the base oil, at ambient temperature. (c) Additives with amine, boron and acid or carboxylate functionalities According to a particular embodiment, a lubricating composition according to the invention may include, as a basic organic additive "TBN booster", one or more additives having amine, boron and acid or carboxylate functionalities. Such additives are described in particular in applications WO 2018 / 220007, WO 2018 / 220009, WO 2019 / 229173, WO 2020 / 094796, WO 2020 / 094800 and WO 2021 / 089671. These additives can be specifically chosen from the products of the reaction between at least: - a hydroxybenzoic acid, optionally substituted by a hydroxycarbon group; or an alkali or alkaline earth metal salt thereof, optionally superbased; - a boron compound; and - an amino compound, in particular chosen from the compounds detailed below. Hydroxybenzoic acid type compound and hydroxybenzoate salt Hydroxybenzoic acid-type compounds, optionally substituted with a hydrocarbon group, are molecules that include at least one benzoic acid fragment, and in which the aromatic ring bears at least one hydroxyl group, and possibly an alkyl, alkenyl, aryl, or aralkyl substituent. When present, the hydrocarbon substituent and the hydroxyl group may be in ortho, meta, or para positions relative to the acid group and to each other. The hydrocarbon substituent may consist of 1 to 50 carbon atoms. Hydroxybenzoic acid type compounds include salicylic acid (2-hydroxybenzoic acid), 3-hydroxybenzoic acid, 4-hydroxybenzoic acid, preferably salicylic acid. Hydroxybenzoic acid-type compounds substituted with a hydrocarbon group may be chosen, for example, from mono-(alkyl or alkenyl) substituted salicylic acids, alkyl and / or alkenyl di-substituted salicylic acids, acid functionalized calixarenes, in particular salicylic acid calixarenes, and mixtures thereof. Preferably, compounds of the hydroxybenzoic acid type, possibly substituted by a hydrocarbon group, can correspond to the following formula (IX): [Chem.21] Or 9 ÿ ôn Ia (x) in which: R represents a hydrocarbon group, linear, branched or cyclic, of 1 to 50 carbon atoms, R possibly including one or more heteroatoms; a is equal to 0, 1 or 2, preferably a is equal to 1. When a equals 2, the hydrocarbon groups can be identical or different. Hydrocarbon groups include alkyl, alkenyl, aryl, and aralkyl groups, and may include one or more heteroatoms. The heteroatoms in hydrocarbon groups R can be chosen from O, N, S; for example, they can be chosen from -OH, -NH, or -SH, or -O-, -NH-, -N=, or -S-. Preferably, R does not include a heteroatom. Preferably, R represents an alkyl or alkenyl group, linear or branched, preferably a linear alkyl group, comprising from 1 to 50 carbon atoms, in particular from 12 to 40 and more particularly from 18 to 30 carbon atoms. Preferably, the compound hydroxybenzoic acid of formula (IX) is salicylic acid or a derivative of salicylic acid of formula (IXA) [Chem.22] 2H a (EXA) in which R and a have the aforementioned definitions. According to one embodiment, hydroxybenzoic acid type compounds, optionally substituted by a hydrocarbon group, can be selected from calixarene structures. The calixarene structures according to the invention more particularly designate cyclic structures comprising m units of hydroxybenzoic acid substituted by a hydrocarbon group of formula (X) and n units of phenol of formula (XI) which are linked together to form a cycle. [Chem.23] *» oO * + > y a} {ed & ; £ * to s & TV At 27 at 5 (XF) in which: G, represents a hydrocarbon group, linear, branched or cyclic, of 1 to 50 carbon atoms, and G, may include one or more heteroatoms, in particular chosen from O, Net S; preferably G, is chosen from alkyl and alkenyl groups, in particular a linear alkyl group comprising in particular 12 to 40 carbon atoms, in particular 18 to 30 carbon atoms; bvaut0,10u 2; Q represent, independently of each other, divalent bonding groups, G3, G3, G4 and G; are chosen from: OH, H or a hydrocarbon group of 1 to 50 carbon atoms which includes one or more heteroatoms, provided that one or two of G, G, G, G, and G; is OH, put n are integers that satisfy: m between 1 and 8, n is at least 3, m+n is between 4 and 20, preferably between 5 and 12. When b = 2, the hydrocarbon groups G can be identical or different. Preferably, the units (X) are chosen from units of the following formula (XA): [Chem.24] OH % t: @ (tie to vd {XA) in which G, Q and b are such as defined for formula (X). Preferably, in formula (XT), Gs is a hydroxyl group. Advantageously, G2, G3, G4 in formula (XI) represent, independently of each other, H or an alkyl or alkenyl group of 1 to 50 carbon atoms; in particular H or a linear alkyl group of 1 to 40 carbon atoms, in particular from 1 to 30 carbon atoms and more specifically from 4 to 25 carbon atoms. When more than one unit (X) is present, the units (X) may be identical or different. The units (XI) may be identical or different in a calixarene molecule. The Q groups can be chosen, independently of each other, from -S- and formula groups (CHG;).- in which G; is chosen from a hydrogen atom and a hydrocarbon group of 1 to 10 carbon atoms and c is an integer of 1 to 4 carbon atoms, notably each G, is H. The alkali and / or alkaline earth metal hydroxybenzoate compounds, optionally substituted by a hydrocarbon group, are the alkali and / or alkaline earth metal salts of the aforementioned hydroxybenzoic acid type compounds. Preferably, the alkali metal is lithium, sodium, or potassium, especially potassium. Preferably, the alkaline earth metal is calcium, barium, magnesium, or strontium, preferably calcium. According to a particular embodiment, in the reaction with the boron compound and the amine compound, the hydroxybenzoic acid-type compound, optionally substituted with a hydrocarbon group, or an alkali and / or alkaline earth metal salt thereof, may be used in a mixture with an alkylphenol. The mixture may, for example, comprise up to 50 mol% of alkylphenol, relative to the total number of moles of the mixture of alkylphenol and the hydroxybenzoic acid-type compound or alkali and / or alkaline earth metal hydroxybenzoate. Boreal compound The boron compound (in other words, based on boron) can be chosen in particular from boric acid (B(OH);), hydrocarbon boronic acids, boric esters and hydrocarbon boronic esters, boron oxide and boric acid complexes. In particular, the boron compound may be chosen from boric acid; boron oxide; boric acid complexes; trialkyl borates, especially in which the alkyl groups independently comprise from 1 to 4 carbon atoms; boronic acids having a C,-Cy alkyl group; boric acids substituted with two alkyl groups, especially in C, AC; boric acids substituted with two aryl groups, especially in C₁ to C₂; boric acids substituted with one or two aryl groups, especially in C₁ to C₂; and derivatives of these compounds obtained by substituting at least one alkyl group with one or more alkoxy groups. Alkyl and alkoxy groups can be linear, branched, or cyclic. Boric acid complexes are, in particular, complexes of boron with one or more molecules comprising one or more alcohol functions. According to a particular embodiment, the boron compound is boric acid. Amino compound According to a first embodiment, the amine compound can be a polyalkylamine compound, as described in application WO 2021 / 089671, of formula (XII): [Chem.25] Ra 547 at; N _ RO (XI in which: al represents 0 or 1; x], yl and z1 represent, independently of each other, an integer chosen from 1, 2 and 3; preferably 2 or 3; when al=0, Rs and Ro represent, independently of each other, a C,-C3 - alkyl group; when al=1, Rs and R, independently of each other, represent a group chosen from: a hydrogen atom and a C,-Cz-alkyl group. Preferably, in formula (XII), x1=y1. Preferably, in formula (XII), when al=1, x1=yl=z1. According to a first embodiment, the polyalkylamine compound has formula (XII) in which al= 0 (triamine compounds). The polyalkylamine compound may more particularly be of formula (XIIA): [Chem.26] NH2 NH MIS (XJIA) in which: Rs and Rs represent, independently of each other, a C,-Cz-alkyl group; preferably R:=R; x] and yl are, independently of each other, an integer chosen from 1, 2 and 3; preferably 2 or 3; preferably x1=y1; the total number of carbon atoms in formula (XIIA) being between 4 and 10, preferably is 8. Preferably, x1=y1=3. Preferably, Rs=R,=CH,. The di-alkylaminopolyalkylamine of formula (XIIA) may be dimethylaminopropylaminopropylamine (DMAPAPA). According to another embodiment, the polyalkylamine compound has the formula (XID in which al= 1 (tetramine compounds). The polyalkylamine compound may more particularly be of formula (XIIB): [Chem.27] Ra | NH NH NH. OMG (XIIB) in which: Rs and Ro represent, independently of each other, a hydrogen atom or an alkyl group at C, to C; ; preferably R;=R, ; in particular Rs=R£=H ; x], yl and z1 are integers, independently of each other, 1, 2 or 3; preferably x1=y1=z1, and in particular 2 or 3, in particular 2. The tri-alkylaminopolyalkylamine of formula (XIIB) can be in particular triethylenetetramine. According to another embodiment, the amine compound may be a quaternary ammonium salt, as described in applications WO 2019 / 229173 and WO 2020 / 094796. Preferably, the amine compound can be chosen from quaternary ammonium salts comprising four hydrocarbon groups, advantageously chosen from C,-C40 alkenyl and alkyl groups. According to a particularly preferred embodiment, the amino compound is chosen from quaternary ammonium salts corresponding to formula (XIII): [Chem.28] R44 WwW *411 R = 12 x Re Ras Qaim in which: W- represents a counter ion, specifically chosen from among the halogens, for example Cl Rio, Ru, Riz and R;3 are chosen, independently of each other, from hydrocarbon groups comprising from 1 to 40 carbon atoms, advantageously from alkenyl and alkyl groups, linear, branched or cyclic, comprising from 1 to 40 carbon atoms. According to a first embodiment, R10, R11, Ry2 and R13 are chosen, independently of each other, from linear alkyl and alkenyl groups comprising from 1 to 8 carbon atoms, preferably from 2 to 6 carbon atoms. According to another embodiment, R40, R11, R12 and Ry3 are chosen, independently of each other, from linear alkyl and alkenyl groups comprising from 14 to 22 carbon atoms, preferably from 14 to 18 carbon atoms and more preferably from 16 to 18 carbon atoms. For example, compounds of formula (XIII) are commercially available from Aczo under the references Arquad® and Ethoquad®. According to another variant, the amine compound may be chosen from compounds comprising two or three amine functions, at least one amine function being substituted by at least one hydrocarbon group and, optionally, one or more amine functions being substituted by at least one monoalkoxy or polyalkoxy group, as described in applications WO 2018 / 220007 and WO 2020 / 0947966. According to this variant, preferably, the amine compound is chosen from compounds comprising two or three amine functions, at least one amine function being substituted by at least one hydrocarbon group comprising from 1 to 40 carbon atoms, advantageously a C,-C4 alkyl or alkenyl group, and where one or more amine functions is / are optionally substituted by a C,-C monoalkoxy or polyalkoxy group. In a particularly preferred embodiment, the amine compound is chosen from among the diamines of formula (XIV) [Chem.29] RioNX1-Rd-NZ122 (XIV) or triamines of formula (XV) [Chem 301] [Chem.30] RioNX1-Rd-NY-Re-NZ:Z2 (XV in which X represents a group chosen from a hydrogen atom, an alkyl group or an alkenyl group R;; ; Ÿ represents a group chosen from a hydrogen atom, an alkyl group or an alkenyl group R;3; Z, and Z, represent, independently of each other, a hydrogen atom, an alkyl group or an alkenyl group Ry; Rio, Rir, Ry2 and R;3 represent, independently of each other, hydrocarbon groups comprising from 1 to 40 carbon atoms, advantageously alkyl or alkenyl groups comprising from 1 to 40 carbon atoms, Rd and Re represent, independently of each other, alkyl or alkenyl groups comprising from 1 to 20 carbon atoms; when Z, and Z; both represent alkyl or alkenyl groups Ry2, they can be different. Preferably, in formulas (XIII), (XIV), and (XV), R10, R11, Ry2, and Ry3 are selected independently from alkyl and alkenyl groups, preferably linear, comprising from 4 to 30 carbon atoms, in particular from 8 to 22 carbon atoms, especially from 14 to 22 carbon atoms, preferably from 14 to 18 carbon atoms, and more preferably from 16 to 18 carbon atoms. In a particular embodiment, the groups Ro, R11, Ry2, and Ry3 are identical. In formulas (XIV) and (XV), Rd and Re are preferably chosen from linear alkyl and alkenyl groups, preferably linear alkyl groups, in particular comprising 2 to 4 carbon atoms. Advantageously, Rd and Re are chosen from -CH,-CH--, -CH(CH3)-CHz- and -CH; - CH-CH-. According to a particular embodiment, the amino compound of formula (XIV) has the formula (XIVA): [Chem.31] x 1 RNA—{CH25NH 10 (XIVA) in which Rp and X are such as defined previously for formula (XIV) and x2 is 2, 3 or 4. According to a particular embodiment, the amino compound of formula (XV) has the formula (XVB): [Chem.32] x Qu Le — Ha — EN + HC Ha NH (XVB) in which: Ru and X; are such as defined previously for formula (XV); x2 is 2, 3 or 4; y2 is 2, 3 or 4. According to another embodiment, the amine compound may be selected from mixtures of polyalkylamines substituted with two alkyl and / or alkenyl fatty acid chains, as described in applications WO 2018 / 220009 and WO 2020 / 094800. The polyalkylamine mixture more particularly comprises one or more po- Lyalkylamines of formula (IID) or (IV) as described previously. [Chem.33] NH2 ASS \ R 0 0e ja SAONE 7 PTS J. P { = an fs TS ALAN R5 SUR H nn aw in which: Rs and Ry represent, independently of each other, alkyl or alkenyl groups, linear or branched, preferably linear, comprising from 4 to 30 carbon atoms, preferably from 8 to 22 carbon atoms and more particularly from 14 to 18 carbon atoms, preferably from 16 to 18 carbon atoms; net z represent, independently of each other, 0, 1, 2 or 3; and when z is different from 0, 0 and p are equal, independently of each other, to 0, 1, 2 or 3; or derivatives thereof: in which the mixture of polyalkylamines comprises at least 3% by mass, in particular at least 5% by mass, especially at least 7% by mass, preferably at least 10% by mass and more particularly at least 20% by mass, of polyalkylamines of formula (III) and / or (IV) branched relative to the total mass of the mixture of polyalkylamines of formula (III) and (IV). By branched, we mean that, for a polyalkylamine of formula (III), at least one of n and z is greater than or equal to 1, and for a polyalkylamine of formula (IV), n is greater than or equal to 1. Preferably, the polyalkylamine mixture comprises, or even consists of, compounds of formula (III) or (IV) in which n, 0, p and z are, independently of each other, 0, 1 or 2, preferably 0 or 1. In formulas (III) and (IV), Rç and Ry, preferably identical, may be derived from animal and vegetable oils and fats, in particular as described previously, and especially from tallow oil, coconut oil and palm oil, preferably tallow oil. Such amines may be commercially available from the company Akzo, by example under the commercial reference Tetrameen® 2HBT. reaction product As previously stated, the compound used as a "TBN booster" additive in a lubricant composition according to the invention can thus be the product of the reaction of at least one hydroxybenzoic acid, optionally substituted by a hydrocarbon group or an alkali and / or alkaline earth metal salt thereof, with at least one boron compound and at least one amine compound, as described above. The reaction can, for example, be carried out by combining the hydrobenzoic acid or hydroxybenzoate compound and the boron compound in the desired ratio and in the presence of a suitable solvent. Suitable solvents can be, for example, naphtha and polar solvents such as water and alcohols, for example, methanol, ethanol, propanol, and butanol. Advantageously, the reaction is carried out with a molar ratio of hydroxybenzoic acid / borate compound of the type ranging from 30:1 to 1:30, preferably from 15:1 to 1:5, especially from 10:1 to 1:5, more particularly from 5:1 to 1:2 and even more preferably from 4:1 to 1:1. After sufficient time, the boron compound is dissolved. Then, the amine compound is slowly added to the mixture to effect neutralization and the formation of the desired reaction product. Advantageously, the amino compound is added in such an amount that the molar ratio of hydroxybenzoic acid type compound / amino compound is between 30:1 and 1:30, in particular from 10:1 to 1:5, preferably between 15:1 and 1:5, more preferably between 5:1 and 1:2 and more preferably between 4:1 and 1:1. Advantageously, the amino compound is added in such an amount that the molar ratio of borated compound / amino compound is between 20:1 and 1:20, preferably between 10:1 and 1:10, more preferably between 5:1 and 1:5 and more preferably between 2:1 and 1:2. The reaction can be carried out by maintaining the reaction medium at a temperature between about 20°C and about 100°C, for example between about 50°C and about 75°C, usually for a time of 0.5 to 5 hours, and more preferably between 1 and 4 hours. The resulting product contains a complex mixture of compounds that can be used as is in the lubricating composition according to the invention. Preferably, the product results from the reaction of a mixture of reactants (not including the solvent(s)) consisting of at least one hydroxybenzoic acid or alkali or alkaline earth metal hydroxybenzoate type compound optionally substituted by a hydrocarbon group, at least one boron compound and at least one amine compound, and possibly an alkylphenol. Other basic organic additives improving TBN can also be considered according to the invention, such as succinimide-type dispersants or nitrogen-based organic dispersants. According to one particular embodiment, the "TBN booster" additive(s) used in a lubricating composition according to the invention consist of one or more polyalkylamines. Alternatively, according to another particular embodiment, a lubricating composition according to the invention comprises no "TBN booster" additives other than polyalkylamine-type additives, in particular as described above. According to a particular embodiment, a lubricating composition according to the invention may comprise, or even be composed of: - from 60 to 99.8% by mass, in particular from 70 to 90% by mass, of one or more base oils: - from 0.01 to 0.8% by mass, in particular from 0.05 to 0.5% by mass, of one or more carbodiimide additives, in particular as defined above; - from 0.1 to 10% by mass, preferably from 0.5 to 7% by mass and more particularly from 1 to 5% by mass, of at least one basic organic additive improving the total base index (TBN) of said composition, in particular of amine additive(s), preferably comprising one or more polyalkylamines as described above; the contents being expressed in relation to the total mass of said lubricating composition. Other additives A lubricating composition according to the invention may include all types of additives suitable for the intended use of the lubricant, as detailed in the following text, for example for use in gas engine systems, for mobile and stationary applications, heavy-duty engine systems, four-stroke marine engine systems, etc. In particular, when seeking to formulate a lubricant with a low sulfated ash content, the additives are chosen so as not to significantly impact the sulfated ash content of the lubricant composition. These additives can be introduced individually and / or in the form of a mixture of additives similar to those already available for sale for commercial lubricant formulations for vehicle engines, of performance level as defined by ACEA (European Automobile Manufacturers' Association) and / or API (American Petroleum Institute), well known to those skilled in the art. These additives, distinct from the aforementioned basic organic additive(s) improving TBN and from the aforementioned carbodiimide additive(s), may be chosen in particular from among metallic detergents, friction modifiers, anti-wear additives, extreme pressure additives, antioxidants, viscosity index (VI) improvers, pour point depressant (PPD) additives, dispersants, antifoaming agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof. Advantageously, a lubricating composition according to the invention comprises one or more additives selected from viscosity index improvers, pour point lowering additives, anti-wear additives, antioxidants and mixtures thereof. Metallic detergent additives Metallic detergents are known to those skilled in the art. They are generally anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head, the associated cation being a metallic cation of an alkali or alkaline earth metal. They are generally chosen from alkali metal or alkaline earth metal salts of carboxylic acids, sulfonates, salicylates, naphthenates, and phenate salts. The alkali and alkaline earth metals are preferably calcium, magnesium, sodium, or barium. These metallic salts generally contain the metal in stoichiometric quantities (these are then called non-superbased or "neutral" detergents), or in excess, i.e., in a quantity greater than the stoichiometric amount. These are then called superbased detergent additives; the excess metal that gives the detergent additive its superbased character is then generally in the form of a metallic salt insoluble in the base oil, for example, a carbonate, a hydroxide, an oxalate, an acetate, a glutamate, preferably a carbonate. According to a particular embodiment, the lubricating composition according to the invention comprises at least one metallic detergent additive selected from over-based detergents and / or neutral detergents. In particular, the super-based detergent and / or the neutral detergent are compounds based on metals selected from calcium, magnesium, sodium and barium, preferably based on calcium or magnesium. Preferably, the over-based detergent is over-based with insoluble metallic salts selected from the group of alkali and alkaline-earth metal carbonates, preferably calcium carbonate. The over-based detergent used in a lubricating composition according to the invention can be chosen in particular from among phenates, sulfonates, salicylates and mixed detergents (phenates-sulfonates-salicylates) over-based with calcium carbonate, more particularly from sulfonates and phenates over-based with calcium carbonate. A lubricating composition according to the invention may comprise less than 15% by mass of metallic detergent(s), in particular less than 10% by mass, and more particularly from 0.5% to S%, in particular less than 2% by mass, of metallic detergent(s), relative to the total mass of said lubricating composition. Reducing the content of metallic detergent(s) makes it advantageous to meet the specifications of "LOW SAPS" lubricating compositions. Advantageously, a lubricating composition according to the invention thus has a sulfated ash content, determined according to ASTM D-874, of less than or equal to 1.3% by mass, in particular less than or equal to 1% by mass and more particularly less than or equal to 0.8% by mass. According to a particular embodiment, a lubricating composition according to the invention may comprise, or even be composed of: - 60 to 99% by mass, in particular 70 to 90% by mass, of one or more base oils: - from 0.01 to 0.8% by mass, in particular from 0.05 to 0.5% by mass, of one or more carbodiimide additives, in particular as defined above; - from 0.1 to 10% by mass, preferably from 0.5 to 7% by mass and more particularly from 1 to 5% by mass, of at least one basic organic additive improving the total base index (TBN) of said composition, in particular comprising one or more polyalkylamines as defined above; - from 0.5 to 10% by mass; in particular from 0.5 to 5% by mass, of one or more metallic detergent additives, in particular chosen from over-based detergents and / or neutral detergents as described above; the contents being expressed in relation to the total mass of said lubricating composition. A lubricating composition considered according to the invention may include at least one friction-modifying additive. Friction-modifying additives can be chosen from compounds providing metallic elements and ash-free compounds, preferably from ash-free compounds. Among the compounds providing metallic elements, we can mention transition metal complexes such as Mo, Sb, Sn, Fe, Cu, Zn whose ligands can be hydrocarbon compounds including atoms of oxygen, nitrogen, sulfur or phosphorus. Advantageously, friction-modifying additives are chosen from ash-free compounds, generally of organic origin, and can be more specifically selected from fatty acid and polyol monoesters, alkoxylated amines, alkoxylated fatty amines, fatty epoxides, and fatty epoxides. of borate, fatty amines or glycerol esters of fatty acids. According to the invention, the fatty compounds comprise at least one hydrocarbon group comprising from 10 to 24 carbon atoms. According to an advantageous variant, a lubricating composition includes at least one friction-modifying additive, in particular molybdenum-based. In particular, molybdenum-based compounds can be selected from molybdenum dithiocarbamates (Mo-DTC), molybdenum dithiophosphates (Mo-DTP), and mixtures thereof. Advantageously, a lubricating composition considered according to the invention may comprise from 0.01 to 5% by mass, preferably from 0.01 to 5% by mass, more particularly from 0.1 to 2% by mass or even more particularly from 0.1 to 1.5% by mass, relative to the total mass of the lubricating composition, of friction-modifying additives, advantageously including at least one molybdenum-based friction-modifying additive. A lubricating composition considered according to the invention may include at least one antioxidant additive. Antioxidant additives are primarily intended to delay the degradation of the lubricating composition during service. This degradation can manifest itself in particular through the formation of deposits, the presence of sludge, or an increase in the viscosity of the lubricating composition. They act, in particular, as radical inhibitors or hydroperoxide scavengers. Commonly used antioxidant additives include phenolic antioxidants, amine antioxidants, and phosphosulfur antioxidants. Some of these antioxidants, such as phosphosulfur antioxidants, can generate ash. Phenolic antioxidants may be ash-free or in the form of neutral or basic metal salts. Antioxidant additives may include sterically hindered phenols, sterically hindered phenol esters, sterically hindered phenols containing a thioether bridge, diphenylamines, diphenylamines substituted with at least one C,-C, alkyl group, N,N'-dialkylaryl diamines, and mixtures thereof. Preferably, sterically hindered phenols are chosen from compounds comprising a phenol group in which at least one vicinal carbon of the carbon bearing the alcohol function is substituted by at least one C,-C10 alkyl group, preferably a C,-C4 alkyl group, preferably a C, alkyl group, preferably by the ter-butyl group. Amino compounds are another class of antioxidant additives that can be used, possibly in combination with phenolic antioxidant additives. Examples of amino compounds are aromatic amines, for example... aromatic amines of formula NRSR°R'° in which R* represents an aliphatic group or an aromatic group, possibly substituted, R° represents an aromatic group, possibly substituted, R!° represents a hydrogen atom, an alkyl group, an aryl group or a group of formula R'"'S(O),R" in which R'! represents an alkylene group or an alkenylene group, R represents an alkyl group, an alkenyl group or an aryl group and z represents 0, 1 or 2. Sulfurized alkyl phenols or their alkali and alkaline earth metal salts can also be used as antioxidant additives. A lubricating composition considered according to the invention may contain all types of antioxidant additives known to those skilled in the art. Advantageously, the lubricating composition comprises at least one ash-free antioxidant additive. Also advantageously, a lubricating composition considered according to the invention may comprise from 0.1 to 2% by mass, relative to the total mass of the composition, of at least one antioxidant additive. A lubricating composition considered according to the invention may include at least one pour point depressant additive (also known as a "PPD" agent). By slowing the formation of paraffin crystals, pour point depressant additives generally improve the cold-weather performance of the lubricating composition. Examples of pour point reducing agents include alkyl polymethacrylates, polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalenes, and alkylated polystyrenes. A lubricating composition considered according to the invention may also include at least one dispersing agent. Dispersing agents ensure the suspension and removal of insoluble solid contaminants consisting of oxidation byproducts that form when the lubricating composition is in service. They may be selected from Mannich bases, succinimides, and their derivatives. In particular, a lubricating composition considered according to the invention may comprise from 0.2 to 10% by mass of dispersing agent(s), relative to the total mass of the composition. A lubricating composition considered according to the invention may also include at least one viscosity index (VI) improver. Viscosity index (VI) improvers, particularly viscosity index improving polymers, ensure good cold-weather performance and minimal viscosity at high temperatures. Examples of viscosity index improving polymers include polymer esters, homopolymers, or hydrogenated or non-hydrogenated copolymers. styrene, butadiene and isoprene, olefin homopolymers or copolymers, such as ethylene or propylene, polyacrylates and polymethacrylates (PMA). In particular, a lubricating composition considered according to the invention may comprise from 1 to 15% by mass of additive(s) improving the viscosity index, relative to the total mass of the lubricating composition. A lubricating composition considered according to the invention may also include at least one antifoaming additive. Antifoaming additives may be selected from polar polymers such as polymethylsiloxanes or polyacrylates. In particular, a lubricating composition considered according to the invention may comprise from 0.01 to 3% by mass of antifoaming additive(s), relative to the total mass of the lubricating composition. According to a particular embodiment, a lubricating composition according to the invention may comprise, or even be composed of: - a base oil or a mixture of base oils, - one or more carbodiimide additives, in particular as defined above; - one or more basic organic additives improving the total base index (TBN) of said composition, in particular comprising one or more polyalkylamines as described above; - possibly one or more additives, distinct from the said basic organic additive(s) improving the TBN and from the said carbodiimide additive(s), chosen from metallic detergent additives, friction modifiers, anti-wear additives, extreme pressure additives, antioxidants, viscosity index (VI) improvers, pour point depressant (PPD) additives, dispersants, anti-foaming agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof. Preferably, a lubricating composition formulated according to the invention comprises, or is even made up of: - 60 to 99% by mass of one or more base oils; - from 0.01 to 0.8% by mass, in particular from 0.05 to 0.5% by mass, of one or more carbodiimide additives, in particular as defined above; - from 0.1 to 10% by mass, preferably from 0.5 to 7% by mass and more particularly from 1 to 5% by mass, of at least one basic organic additive improving the total base index (TBN) of said composition, in particular comprising one or more polyalkylamines as defined above; - possibly 1 to 30% by mass, preferably 5 to 20% by mass, of one or more other additives, distinct from the aforementioned basic organic additive(s) improving the TBN and from the aforementioned carbodiimide additive(s), chosen from among the detergent additives me- tallics, friction modifiers, anti-wear additives, extreme pressure additives, antioxidants, viscosity index (VI) improvers, pour point depressants (PPD) additives, dispersants, anti-foaming agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof; the contents being expressed in relation to the total mass of said lubricating composition. According to a particular embodiment, a lubricating composition according to the invention may have a kinematic viscosity, measured at 40°C according to ASTM D445, of between 20 mm² / s and 50 mm² / s, preferably between 25 mm² / s and 40 mm² / s. Advantageously, a lubricating composition according to the invention has a kinematic viscosity, measured at 100°C according to ASTM D445, of between 2 mm² / s and 20 mm² / s, preferably between 4 mm² / s and 15 mm² / s. All the characteristics and specific methods relating to the implementation of a carbodiimide compound according to the invention and to the lubricating composition comprising it, also apply to the uses, processes, and methods referred to in the invention. APPLICATION As previously stated, the lubricating compositions considered according to the invention can be intended for various motorization systems, mobile or stationary. In particular, the invention proves to be particularly advantageous for implementation in drive systems comprising an elastomeric material, for example elastomeric seals, exposed to said lubricant. The invention thus relates, according to another of its aspects, to the use of a composition as defined above, incorporating one or more carbo-diimide additives as an additive improving the compatibility of the lubricating composition with respect to elastomers, for lubricating a motorization system, in particular mobile or stationary. Lubricating compositions according to the invention can be intended in particular for motorization systems including an internal combustion engine, for example a Diesel engine or a gas engine. The engine system may include a diesel fuel engine, typically a heavy-duty diesel engine, a marine engine, a petrol engine, a gas engine, or an ammonia engine. This can include engine systems for light vehicles, heavy vehicles, and boats. In particular, the lubricating composition considered according to the invention may be a lu- brescent for gas engine systems, mobile or stationary, in particular for natural gas engines (LNG or CNG), hydrogen engines, but also dual fuel gas / petrol, dual fuel gas / diesel engines. It can be implemented for heavy-duty vehicle engine systems and four-stroke marine engine systems. In particular, a lubricating composition according to the invention is implemented for propulsion systems separate from two-stroke marine engines. It can find a particularly advantageous application for motorization systems with a gas engine, especially operating with gases of renewable origin, for example gases loaded with impurities, and for which it is important to implement a lubricant with a high level of TBN. It is also particularly well-suited for lubricating heavy-duty vehicle engine systems, such as those in trucks. It is also suitable for heavy-duty diesel engines equipped with exhaust gas recirculation (EGR) systems. Such systems can be used in efforts to reduce the environmental emissions of these engines. Diesel engines with EGR can experience higher loads of acidic combustion products, transferred to the lubricant from the exhaust gases, so lubricants with high TBN levels are often desirable to perform the neutralization of these acids. The invention will now be described by means of the following examples, given by way of illustration and not limitation of the invention. Examples The compatibility of engine lubricants with elastomers is evaluated according to the CEC L-112-16 standard. This test explores the performance of four types of elastomeric materials (RE6: fluoroelastomer; RE7: polyacrylate; RE: nitrile and RE9: ethylene acrylic) when exposed to a lubricant. The reference lubricant is a commercial lubricant under the reference NATERIA MI 40, intended for the lubrication of stationary gas engines. Formulations C1, II, I2 and I3 are prepared by supplementing the reference lubricant with: - a basic organic additive of the polyalkylamine type: N,N'-Dimethyldipropylene triamine, denoted DMAPAPA (formulations C1, I1 and I2), at a mass content of 0.5% relative to the mass of the reference lubricant; or N,N,N',N'-tetramethyldipropylene triamine, denoted TMDPT (formulation I3), at a mass content of 0.7% by mass relative to the mass of the reference lubricant; and - for formulations II, I2 and I3, in addition, by a carbodiimide additive according to the invention (N,N”-bis(2,6-diisopropylphenyl)carbodiimide), introduced in the form of two commercial products denoted Carbodiimide 1 and Carbodiimide 2, in a mass content of commercial product of 1% or 2% by mass relative to the total mass of the reference lubricant. The results obtained in terms of volumetric variation, variation of tensile strength and elongation at break, according to the tests carried out according to the CEC L-112-16 standard, on the different elastomeric materials, when exposed to the reference lubricant and to each of the lubricant compositions C1, I1, I2 and I3, are gathered in the table below. [Tables 2] ci u EVA 13 [re] ci target | is | | Value | | 5 0stsa0s | PMAE to (> te | TE target DMAPAPA 1 1421 1e 1 CE 1 484 Ca 0 SRepds | +659 ft | +0.76 pds DMAPAPA | Carbodiimide | Carbodimid | Carhodimide | + - w ' 3 { 23 q 2 *%|ss21 [0 | 5 24 03 0.2 Vañation —_ S Jet of |-1s | assistance | 0 | Report ] 18 | At 68 -63 -65 Ala 2, = 1 resistance | % | | RTS | dla |! — aka 1% | -76-#20 | 31 | -82 -780 -62 -68 70:20 | -31 | 07 îi4 ND xD of resistance | % | Report | s| æ 47 ND ND ta |) da 1 $ d action Blongation éla % | 70:20 | 31 | rupture se | -L848.9 | -0.1 | volumetric TRE ' Variation | % Report | + | resistance | % - rar | is | MASS at || 65415 | | 64 25 ND xD $i 44 ND ND — | Elongation action at %| 65 / 15 | | np % | +10420| 20 | volumetric f ? * Variation a of resistance | %] Report ] 5 I -27 -26 ND ND âla 1 | Res resistance | ss | Report | 5 | âla ala | its | s15 | -26 | À3 15 ND ND breakage 16 8.7 6.5 85 d= assistance | % | Report | -24 | -62 6 A -23 to the GLASS dla || 65;+19 | + | 83 38 -28 42 At ane traction Blongation ds || breakup The results show that adding a carbodiimide additive to the lubricant helps to counteract the adverse effect of adding polyalkylamine on compatibility with elastomers, particularly with regard to the impact of the lubricant on the elongation properties at break of the elastomer material. Thus, the addition of a carbodiimide additive according to the invention to a lubricant allows to achieve good compatibility of the lubricant + A different elastomers, even in the presence of amine additives.

Claims

Demands

1. Lubricating composition intended for a DC motor system, including at least: - one or more base oils; - at least one carbodiimide additive; and - at least one basic organic additive improving the total base index of the said composition, says TBN.

2. Composition according to the preceding claim, characterized in that said carbodiimide additive has the following formula (I): X-(-N=C=NY),N=C=NY (D in which: Each X and Y represent, independently of each other, a radical hydrocarbon, saturated or unsaturated, linear, branched or cyclic, aromatic or not, possibly substituted, comprising from 6 to 60 atoms of carbon, in particular from 8 to 20 carbon atoms and more particularly- bonding of 9 to 15 carbon atoms: q equals 0 or is an integer from 1 to 100, in particular from 1 to 50 and above particularly from 1 to 40.

3. Composition according to claim 1 or 2, characterized in that said carbodiimide additive is a monocarbodiimide of formula (l') next: XN=C=NY ([') in which X and Y, identical or different, represent radicals formula R, Ra Ra in which: * represents the binding site to a nitrogen atom of the car- function bodiimide; at least one of the Rs, and R» represents an aliphatic, linear group, branched or cyclic, substituted or unsubstituted, saturated or unsaturated, or a group aromatic, substituted or not, preferably comprising 2 to 20 carbon atoms: the other of the Rs, and R» represents a hydrogen atom; an alli- group phatic, linear, branched or cyclic, substituted or unsubstituted, saturated or unsaturated, or an aromatic group, substituted or not, preferably comprising 2 to 20 carbon atoms; and R; represents a hydrogen atom, an aliphatic, linear group, branched or cyclic, substituted or unsubstituted, saturated or unsaturated, or a group aromatic, substituted or not, preferably comprising 2 to 20 carbon atoms; said aromatic group being possibly condensed with the supporting phenyl ring.

4. Composition according to the preceding claim, characterized in that X and Y, whether identical or different, represent radicals of the formula R4 Ra > 4 R- in which R and R>, identical or different, in particular identical, represent branched alkyl groups at C; at C3, in particular at C 3 At C,p, particularly in C; at C,, and more preferentially groups isopropyl; and R; represents a hydrogen atom or branched alkyl group at C; to C 20, €N in particular in C; in C,p, especially in C; in C, preferably a hydrogen atom.

5. Composition according to any one of the preceding claims, ca- characterized in that said carbodiimide additive is chosen from among the N,N'-bis(2,6-diisopropylphenyl)carbodiimide, N,N'-bis(2,4,6-triisopropylphenyl)carbodiimide and their mixtures, in In particular, the said carbodiimide additive is the N,N'-bis(2,6-diisopropylphenyl)carbodiimide.

6. Composition according to any one of the preceding claims, ca- characterized in that said basic organic additive improves the TBN presents a basic index, called BN, measured according to the ASTM standard D2896, greater than 10 mg KOH / g and up to 1200 mg KOH / g of additive, in particular greater than or equal to 50 mg KOH / g of additive and more particularly- greater than or equal to 100 mg KOH / g of additive.

7. Composition according to any one of the preceding claims, ca- characterized in that said basic organic additive improves the TBN is chosen from: (a) polyalkylamine additives; {b) ionic liquid additives based on guanidinium, ammonium or phosphonium; (c) additives produced by the reaction between at least: . a hydroxybenzoic acid, optionally substituted by a group hydrocarbon; or an alkali or alkaline earth metal salt thereof, optionally over-based, a boron compound and an amino compound; and their mixtures.

8. Composition according to any one of the preceding claims, ca- characterized in that said basic organic additive improves the TBN is chosen from among the polyalkylamines of formula (ID): 4, Fe N—A1—FNH—A2——N, RC "pniath DR, (im in which: R and Rs represent, independently of each other, an atom of hydrogen or an alkyl or alkenyl group, linear or branched, comprising from 1 to 22 carbon atoms; Rs and R- represent, independently of each other, an alkyl group or alcenvyl, linear or branched, comprising from 1 to 30 atoms of carbon, in particular from 1 to 22 carbon atoms; A1 and A2 represent, independently of each other, a group alkylene in C, at Ce; in particular in C, at C4, preferably groups propylene —CH;);- ; and m is equal to 0, 1, 2 or 3, preferably m is equal to | or 2.

9. Composition according to any one of the preceding claims, ca- characterized in that said basic organic additive improves the TBN is chosen from among the polyalkylamines of formula (II-a) D "6 / R NTRSOS / Rs (Ia) in which: R4 and Rs represent, independently of each other, an atom of hydrogen or an alkyl group at C, at Ce, in particular at C, at C; and more specifically a methyl group; Rs and R; represent, independently of each other, an alkyl group in C, at C5, in particular in C, at Cz and more particularly a group methyl; and polyalkylamines of formula (II-b) D # Rz7 Ra 7 S NH N PRES Rs (Ib) in which: R4 and Rs represent hydrogen atoms; and Rs and R; represent, independently of each other, an alkyl group in C: to Cz, preferably in C, to Cyz and more preferably in C;5 to Here

10. | Composition according to any one of the preceding claims, ca- characterized in that the said basic organic additive(s) improving TBN is implemented at a concentration of at least 0.1% by mass, in a particular concentration between 0.1 and 10% by mass, more specifically between 0.5 and 7% by mass, preferably between 1 and 5% by mass, per relative to the total mass of said composition.

11. Composition according to any one of the preceding claims, ca- characterized in that it includes one or more other additives, distinct from the aforementioned carbodiimide additive(s) and from the aforementioned additive(s) basic organic compounds improving TBN, chosen from among the additives de- metallic detergents; friction-modifying additives, anti-wear additives, extreme pressure additives, antioxidants, viscosity index improvers, viscosity index lowering additives flow agents, dispersants, antifoaming agents, thickeners, corrosion inhibitors, copper passivating agents, and their mixtures.

12. Composition according to any one of the preceding claims, said lubricating composition being a lubricant for a mo- system gas-fired power, particularly biogas, especially for an engine liquefied or compressed natural gas, a hydrogen engine, or even a dual-fuel engine, in particular for a powertrain system four-stroke, especially for a heavy-duty truck engine or an engine four-stroke marine engine.

13. A method for lubricating a motorization system comprising a step of bringing at least one mechanical part of said system into contact with a lubricating composition as defined according to one any of the claims | to 12.

14. Use of at least one carbodiimide additive in a lu- composition br- intended for a motorization system, to improve its com- compatibility with elastomers, particularly in a lu- composition brilliance comprising at least one basic organic additive improving the TBN.

15. Use according to the preceding claim, wherein said additive carbodiimide is as defined in any one of the claims 2 to 5; and / or said basic organic additive improving TBN is such as defined in any one of claims 6 to 10.