KR20180122337A - Lubricant compositions based on neutralized amines and molybdenum - Google Patents

Abstract

The present invention relates to the use of a lubricant composition for reducing friction between at least one carbon coated two surfaces, comprising:
At least one base oil;
At least one organic molybdenum compound;
At least one fully or partially neutralized amine salt, said amine satisfying the formula (I) RN (X) -Y.

Description

Lubricant compositions based on neutralized amines and molybdenum

The present invention relates to the field of lubricant compositions, and more particularly to lubricant compositions for transmissions or engines and particularly automotive engines.

One of the purposes of the lubricant composition is to reduce the friction and wear phenomena of moving mechanical parts in contact with each other. One particular purpose of the lubricant composition is to limit this friction phenomenon in vehicle engines, particularly automotive engines. In addition, the use of carbon coatings in engines, particularly automotive engines, is expanding. Accordingly, it would be advantageous to be able to propose a lubricant composition that can reduce the friction phenomenon irrespective of whether it is a steel / steel, a carbon coating / carbon coating or a steel / carbon coating contact.

In general, to limit the friction phenomenon, a friction modifier may be incorporated into the lubricant composition. In particular, it is known to add fatty acid amines as friction modifiers. However, such an amine may have deleterious effects on seals, particularly on the mechanical component seals and notably on the fluorinated polymer seal. Such an amine can effectively induce accelerated deterioration of the mechanical properties of the seal.

It is also known to use organic molybdenum compounds to reduce the friction phenomenon, more particularly the friction phenomenon for contact between the two steel surfaces. However, it is known to those skilled in the art that the use of organic molybdenum compounds, especially organic molybdenum compounds containing dithiocarbamate groups, can cause deteriorated wear of mechanical components. It has also been observed that the organic molybdenum compounds contained in the lubricant can be decomposed and can even desorb the carbon coating from the surface, which degradation can be marked by the increased content of organic molybdenum compounds in the lubricant.

Accordingly, it would be advantageous to provide a lubricant composition having a moderate impact on other engine members, and particularly on the seal, while reducing the friction phenomenon, especially in the presence of carbon-coated surfaces.

In addition, one of the purposes of the lubricant composition is to improve the engine yield and thus permit fuel economy.

It is therefore an object of the present invention to provide a lubricant composition which enables the reduction of the friction phenomenon in the presence of a surface, especially with a carbon coating, which is particularly advantageous for sealing parts, in particular engine seals, It has a limited impact on the deterioration of the sealing portion of the engine.

It is a further object of the present invention to provide such a composition which allows for a reduction in the friction phenomenon irrespective of whether it is steel / steel, carbon coating / carbon coating or steel / carbon coating contact.

It is a further object of the present invention to provide such a composition which also allows reduction in fuel consumption.

Other objects will become apparent upon reading the following description of the invention.

In order to meet these objects and drawbacks of known lubricant compositions, the present invention proposes a lubricant composition comprising:

- At least one base oil;

- At least one organic molybdenum compound;

- At least one fully or partially neutralized amine salt, wherein the amine satisfies the following formula (I), and wherein the acid neutralizing acid is selected from the monoacid of formula (II):

R-N (X) -Y (I)

In this formula,

R is a linear or branched, fully saturated hydrocarbon radical having 2 to 24 carbon atoms, preferably 4 to 24, more preferably 14 to 24, in particular 16 to 24, for example 18 to 24 carbon atoms Or a partially saturated hydrocarbon group;

X is a linear or branched, fully or partially saturated hydrocarbon group having 1 to 24 carbon atoms, preferably 1 to 10 carbon atoms, especially 1 to 8 carbon atoms, a benzyl group, -R ¹ - [NH-R ² ] _n -NH ₂ ;

Y is a hydrogen atom, a linear or branched, fully or partially saturated hydrocarbon group having 1 to 24 carbon atoms, preferably 1 to 10 carbon atoms, especially 1 to 8 carbon atoms, a benzyl group, -R ¹ - [NH-R ² ] _n -NH ₂ ;

n is an integer from 0 to 3, preferably from 0 to 2, preferably 0 or 1;

The same or different R ¹ and R ² are linear or branched alkyl groups having 2 to 4 carbon atoms, preferably 2 to 3 carbon atoms, preferably CH ₂ CH ₂ or CH ₂ CH ₂ CH ₂ ;

At least one of X and Y is a hydrogen atom or -R ¹ - [NH-R ² ] _n -NH ₂ ;

At least one of X, Y or R is a linear or branched, saturated or unsaturated, saturated or unsaturated hydrocarbon radical having from 4 to 24 carbon atoms, preferably from 14 to 24 carbon atoms, in particular from 16 to 24 carbon atoms, Of fully or partially saturated hydrocarbon groups)

R'COOH (II)

Wherein R 'is a linear or branched, fully or partially saturated hydrocarbon group having from 2 to 24 carbon atoms.

Surprisingly, the present inventors have surprisingly found that the combination of fully or partially neutralized amine salt and organic molybdenum compound of the present invention is limited in friction, irrespective of whether it is steel / steel, carbon coating / carbon coating or steel / And showed little or no impact on sealing deterioration. In addition, the inventors have also demonstrated that the partially or fully neutralized amine salt of the present invention has a better compatibility with the corresponding non-neutralized amine, especially with the encapsulation of the engine and particularly the engine engine seal . In the present application, the seal is a seal used in engine design, generally a polymer seal, and particularly preferably a fluoroelastomer seal. In particular, lubricant compositions comprising at least one partially or fully neutralized amine salt of the present invention enable limited wear of engine seals, particularly automotive engines, as opposed to non-neutralized amines.

Amines which are neutralized and intended to be used in the compositions of the present invention are preferably amines satisfying the formula (Ia)

RN (X) -R ¹ - [NHR ² ] _n -NH ₂ (Ia)

Wherein R, X, R ¹ , R ² and n have the given definition,

At least one of X or R is a linear or branched fully unsaturated hydrocarbon radical having from 4 to 24 carbon atoms, preferably from 14 to 24 carbon atoms, in particular from 16 to 24 carbon atoms, for example from 18 to 24 carbon atoms. Or a partially saturated hydrocarbon group.

Preferably, the compound of formula (I) or (Ia)

R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;

X is a hydrogen atom, a linear or branched alkyl group having from 2 to 8 carbon atoms, a benzyl group, or a group of the formula -R ¹ - [NH-R ² ] _n -NH ₂ .

Preferably, the compound of formula (I) or (Ia)

R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;

X is a hydrogen atom or a group of the formula -R ¹ - [NH-R ² ] _n -NH ₂ .

Preferably, the compound of formula (I)

R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;

Y is -R ¹ - [NH-R ² ] _n -NH ₂ ;

n = 0;

R ¹ is CH ₂ CH ₂ CH ₂ ;

X is CH ₂ CH ₂ CH ₂ NH ₂ or H.

Preferably, the compound of formula (Ia)

R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;

n = 0;

R ¹ is CH ₂ CH ₂ CH ₂ ;

X is CH ₂ CH ₂ CH ₂ NH ₂ or H.

In a particularly preferred manner, the amine is selected from the following amines:

RNHCH ₂ CH ₂ CH ₂ CNH ₂ , wherein R represents a linear or branched, fully or partially saturated hydrocarbon group having from 16 to 18 carbon atoms; or

_{N (R) (CH 2 CH} 2 CH 2 NH 2) (CH 2 CH 2 CH 2 NH 2) (R represents an hydrocarbon saturation in a whole or in part, of a linear or branched having from 16 to 18 carbon atoms) .

In the present invention, the acid used to neutralize the amine of formula (I) or (Ia) defined above in salt form is preferably selected from acids of formula (II) wherein R ' Is a linear or branched, fully or partially saturated hydrocarbon group having from 1 to 24 carbon atoms, preferably from 10 to 24, for example from 14 to 20, in particular from 16 to 20 carbon atoms.

In a particularly preferred manner, the acid which enables the neutralization of the amine of formula (I) or (Ia) is oleic acid.

Amines used in the compositions of the present invention are fully or partially neutralized. Preferably, the molar ratio between the number of moles of nitrogen atoms in the amine and the number of moles of acid functional groups of formula (II) is from 9: 1 to 1: 1, preferably from 5: 1 to 1: 1.

The organomolybdenum compounds according to the invention are intended to designate any organic molybdenum compounds which are soluble in oils, especially base oils.

The organic molybdenum compound of the present invention can be obtained by reacting a molybdenum oxide, an ester, a carboxylate, a carboxylate, and the like which can be obtained through the reaction of molybdenum oxide or ammonium molybdate and a fat, a glyceride, a fatty acid or a fatty acid derivative (ester, amine, amide, Lt; RTI ID = 0.0 > molybdenum. ≪ / RTI >

Preferably, the organomolybdenum compound is selected from a molybdenum source, for example molybdenum trioxide, and a fatty acid having from 4 to 28 carbon atoms, such as preferably from 8 to 18 carbon atoms, such as vegetable or animal oils Containing molybdenum complex with an amide type ligand prepared by reaction of an amine derivative having a fatty acid contained therein.

The synthesis of such compounds is described, for example, in patents US4889647, EP0546357, US5412130, EP1770153.

In one preferred embodiment of the present invention, the organic molybdenum compound is selected from organic complexes of molybdenum obtained via the following reaction:

(i) fats of the mono-, di-, or triglyceride type, or fatty acids;

(ii) an amine source of formula (A);

(Wherein,

X ¹ is an oxygen atom or a nitrogen atom;

X ² is an oxygen atom or a nitrogen atom;

N and m are 1 when X ¹ or X ² is an oxygen atom;

- when X ¹ or X ² is a nitrogen atom, n and m are 2)

(iii) a molybdenum source selected from molybdenum trioxide or molybdate, preferably ammonium molybdate, in an amount sufficient to provide from 0.1 to 30% molybdenum based on the total weight of the complex.

In one embodiment of the invention, the organic complex of molybdenum may comprise from 2 to 8.5 weight percent molybdenum based on the weight of the complex.

In one preferred embodiment of the present invention, the organic complex of molybdenum consists of at least one compound of the formula (III) or (IV), alone or as a mixture:

(Wherein,

X ¹ is an oxygen atom or a nitrogen atom;

X ² is an oxygen atom or a nitrogen atom;

And the case where X ¹ is an oxygen atom and n is 1, if X ² is an oxygen atom m is 1;

When the X ¹ is nitrogen atom and n is 2, and when X ² is a nitrogen atom and m is 2;

R < ₁ > is a linear or branched, saturated or unsaturated alkyl group having from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms,

(Wherein,

X ¹ is an oxygen atom or a nitrogen atom;

X ² is an oxygen atom or a nitrogen atom;

And the case where X ¹ is an oxygen atom and n is 1, if X ² is an oxygen atom m is 1;

When the X ¹ is nitrogen atom and n is 2, and when X ² is a nitrogen atom and m is 2;

R ₁ is a linear or branched, saturated or unsaturated alkyl group having from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms;

R ₂ is a linear or branched, saturated or unsaturated alkyl group having from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms.

In one embodiment of the invention, the organic complexes of molybdenum are prepared by the following reaction:

(i) Mono-, di-, or triglyceride type fats, or fatty acids;

(ii) Diethanolamine or 2- (2-aminoethyl) aminoethanol;

(iii) And a molybdenum source selected from molybdenum trioxide or molybdate, preferably ammonium molybdate, in an amount sufficient to provide 0.1 to 20.0% molybdenum based on the weight of the complex.

In one preferred embodiment of the invention, the organic complex of molybdenum consists of at least one compound of the formula (III-a) or (III-b), alone or as a mixture:

(Wherein,

R < ₁ > is a linear or branched, saturated or unsaturated alkyl group having from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms,

Wherein R < ₁ > is a linear or branched, saturated or unsaturated alkyl group having from 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms.

As an example of a sulfur-free molybdenum complex according to the present invention, Molyvan 855® marketed by Vanderbilt may be mentioned.

In another embodiment, the organic molybdenum compound may be selected from molybdenum dithiophosphate or molybdenum dithiocarbamate.

In one preferred embodiment of the present invention, the organic molybdenum compound is selected from molybdenum dithiocarbamates.

The molybdenum dithiocarbamate compound (Mo-DTC compound) is a complex formed of a metal core bound to at least one ligand, and the ligand is a dithiocarbamate group of alkyl. Such compounds are well known to those of ordinary skill in the art.

In one embodiment of the invention, the Mo-DTC compound is present in an amount of 1 to 40% by weight, preferably 2 to 30% by weight, more preferably 3 to 28% by weight, based on the total weight of the Mo- 4 to 15% by weight of molybdenum.

In another embodiment of the present invention, the Mo-DTC compound is advantageously used in an amount of 1 to 40% by weight, preferably 2 to 30% by weight, more preferably 3 to 28% by weight, based on the total weight of the Mo- May comprise from 4 to 15% by weight of sulfur.

In another embodiment of the present invention, the Mo-DTC compound is a Mo-DTC compound having a core having two molybdenum atoms (also referred to as dimer Mo-DTC) and a core having three molybdenum atoms Compound (also referred to as trimeric Mo-DTC).

In another embodiment of the present invention, the trimeric Mo-DTC compound satisfies the formula Mo ₃ S _k L _n ,

k is an integer ranging from at least 4, preferably from 4 to 10, advantageously from 4 to 7;

n is an integer ranging from 1 to 4;

L is a dithiocarbamate group of alkyl having 1 to 100 carbon atoms, preferably 1 to 40 carbon atoms, advantageously 3 to 20 carbon atoms.

As examples of the trimeric Mo-DTC compounds according to the present invention, compounds such as those described in documents WO 98/26030 and US 2003/022954 and methods for their preparation can be mentioned.

In one preferred embodiment of the present invention, the Mo-DTC compound is a dimeric Mo-DTC compound.

As examples of dimeric Mo-DTC compounds, compounds such as those described in documents EP 0757093, EP 15 0719851, EP 0743354 or EP 1013749 and their preparation methods can be mentioned.

The dimer Mo-DTC compound generally corresponds to a compound of formula (V)

In this formula,

Identical or different R ₃ , R ₄ , R ₅ and R ₆ are each independently a hydrocarbon group selected from alkyl, alkenyl, aryl, cycloalkyl or cycloalkenyl groups;

X ₃ , X ₄ , X _5, and X _{6, which} are the same or different, are each independently an oxygen atom or a sulfur atom.

In the sense of the present invention, an alkyl group means a linear or branched, saturated or unsaturated hydrocarbon group having 1 to 24 carbon atoms.

In one embodiment of the invention, the alkyl group is selected from the group consisting of methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, tert- butyl, n-pentyl, iso-pentyl, neopentyl, Decyl, undecyl, dodecyl, tridecyl, isodecyl, tetradecyl, hexadecyl, stearyl, icosyl, docosyl, tetracosyl, triacontyl, 2-ethylhexyl, 2 2-hexyldecyl, 2-hexyldodecyl, 2-octyldodecyl, 2-decyltetradecyl, 2-dodecylhexadecyl, 2-hexadecyl octadecyl, 2-tetradecyl octadecyl, myristyl, palmityl and stearyl.

In the sense of the present invention, an alkenyl group means a linear or branched hydrocarbon group containing at least one double bond and having from 2 to 24 carbon atoms. The alkenyl group is preferably selected from the group consisting of vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, oleic).

In the sense of the present invention, an aryl group means a polycyclic aromatic hydrocarbon or aromatic group substituted or unsubstituted by an alkyl group. The aryl group may have 6 to 24 carbon atoms.

In one embodiment, the aryl group is phenyl, tolyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentyl May be selected from the group formed by phenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, phenylphenyl, benzylphenyl, phenyl- styrene, p-cumylphenyl and naphthyl have.

In the sense of the present invention, the cycloalkyl group and the cycloalkenyl group may be optionally substituted with one or more substituents selected from cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, Pentenyl, methylcyclohexenyl, but is not limited thereto. The cycloalkyl group and the cycloalkenyl group may have 3 to 24 carbon atoms.

In a preferred embodiment of the present invention, the same or different R ₃ , R ₄ , R ₅ and R ₆ are each independently an alkyl group having 4 to 18 carbon atoms or an alkenyl group having 2 to 24 carbon atoms .

In one embodiment of the present invention, X ₃ , X ₄ , X ₅ and X ₆ may be the same and may represent a sulfur atom.

In another embodiment of the present invention, X ₃ , X ₄ , X ₅ and X ₆ may be the same and may represent an oxygen atom.

In another embodiment of the present invention, X ₃ and X ₄ may represent a sulfur atom, and X ₅ and X ₆ may represent an oxygen atom.

In another embodiment of the present invention, X ₃ and X ₄ may represent an oxygen atom, and X ₅ and X ₆ may represent a sulfur atom.

In another embodiment of the present invention, the ratio of the number of sulfur atoms to the number of oxygen atoms (S / O) of the Mo-DTC compound can vary from (1: 3) to (3: 1).

In another embodiment of the invention, the Mo-DTC compound of formula (V) can be selected from a symmetrical Mo-DTC compound, an asymmetric Mo-DTC compound and combinations thereof.

The symmetrical Mo-DTC compound according to the present invention is a Mo-DTC compound of formula (V) wherein R ₃ , R ₄ , R ₅ and R ₆ groups are the same.

The asymmetric Mo-DTC compound according to the present invention refers to a Mo-DTC compound of formula (V) wherein the groups R ₃ and R ₄ are the same, the groups R ₅ and R ₆ are the same and the groups R ₃ and R ₄ is different from the groups R ₅ and R ₆ .

In one preferred embodiment of the invention, the Mo-DTC compound is a mixture of at least one symmetrical Mo-DTC compound and at least one asymmetric Mo-DTC compound.

In one embodiment of the present invention, R ₃ and R ₄ are the same and represent an alkyl group having 5 to 15 carbon atoms, R ₅ and R ₆ are the same but different from R ₃ and R ₄ , Lt; / RTI > carbon atoms.

In a preferred embodiment of the present invention, R ₃ and R ₄ are the same and represent an alkyl group having 6 to 10 carbon atoms and R ₅ and R ₆ represent an alkyl group having 10 to 15 carbon atoms.

In another preferred embodiment of the present invention, R ₃ and R ₄ are the same and represent an alkyl group having 10 to 15 carbon atoms, and R ₅ and R ₆ are alkyl groups having 6 to 10 carbon atoms.

In another preferred embodiment of the present invention, R ₃ , R ₄ , R ₅ and R ₆ are the same and represent an alkyl group having 5 to 15 carbon atoms, preferably 8 to 13 carbon atoms.

Advantageously, the Mo-DTC compound is selected from compounds of formula (V)

X ₃ and X ₄ are oxygen atoms;

X ₅ and X ₆ are sulfur atoms;

R ₃ is an alkyl group having 8 carbon atoms or an alkyl group having 13 carbon atoms;

R ₄ is an alkyl group having 8 carbon atoms or an alkyl group having 13 carbon atoms;

R ₅ is an alkyl group having 8 carbon atoms or an alkyl group having 13 carbon atoms;

R ₆ is an alkyl group having 8 carbon atoms or an alkyl group having 13 carbon atoms.

Thus, advantageously, the Mo-DTC compound is selected from compounds of the formula (V-a)

Wherein the groups R ₃ , R ₄ , R ₅ and R ₆ are as defined for formula (V).

More advantageously, the Mo-DTC compound is a mixture of:

A Mo-DTC compound of formula (Va) wherein R ₃ , R ₄ , R ₅ and R ₆ represent an alkyl group having 8 carbon atoms;

A Mo-DTC compound of formula (Va) wherein R ₃ , R ₄ , R ₅ and R ₆ represent an alkyl group having 13 carbon atoms; And

A Mo-DTC compound of formula (Va) wherein R ₃ , R ₄ represent an alkyl group having 13 carbon atoms and R ₅ and R ₆ represent an alkyl group having 8 carbon atoms; And / or

- a Mo-DTC compound of formula (Va) wherein R ₃ , R ₄ represent an alkyl group having 8 carbon atoms and R ₅ and R ₆ represent an alkyl group having 13 carbon atoms;

Examples of Mo-DTC compounds include the products Molyvan L®, Molyvan 807® or Molyvan 822®, marketed by RT Vanderbilt Company®, or products Sakura-lube 200®, Sakura-lube 165®, Sakura- lube 525® or Sakura-lube 600® may be mentioned.

Preferably, the lubricant composition of the present invention comprises from 0.05 to 5% by weight, preferably from 0.1 to 2% by weight, based on the total weight of the composition, of a partially or fully neutralized amine salt.

Preferably, the lubricant composition of the present invention comprises from 0.01 to 3% by weight, preferably from 0.05 to 3% by weight, for example from 0.1 to 2% by weight, based on the total weight of the composition, of organic molybdenum compounds.

In general, the lubricant compositions of the present invention may comprise any type of animal or vegetable lubricant base oil, mineral, synthetic or natural, known to those of ordinary skill in the art.

The base oils used in the lubricant compositions of the present invention may be minerals of synthetic origin (Table A) or mixtures thereof belonging to classes I to V (or equivalents thereof in the ATIEL classification) of the classes defined in the API classification have.

<Table A>

The mineral base oil of the present invention can be used for the refining operations such as solvent extraction, deasphalting, solvent dewaxing, hydrotreating, hydrocracking, hydrogen isomerization and hydrofinishing, followed by vacuum distillation and atmospheric distillation of crude oil Lt; RTI ID = 0.0 &gt; oil. &Lt; / RTI &gt;

Mixtures of synthetic and mineral oils may also be used.

In general, other than the requirement that the various lubricity bases for making the lubricant compositions of the present invention have properties of viscosity, viscosity index, sulfur content, oxidation resistance, particularly adapted for use in an engine or vehicle transmission, There is no.

Base oils of the lubricant compositions of the present invention may also be selected from synthetic oils such as carboxylic acids and some esters of alcohols and polyalphaolefins. The polyalphaolefins used as the base oil have, for example, from 4 to 32 carbon atoms (for example octene or decene) and from 1.5 to 15 mm ² .s ^-1 according to standard ASTM D445, Is obtained from a monomer having a viscosity. Their molecular weight average is generally from 250 to 3 000 according to standard ASTM D 5296.

Preferably, the base oil of the present invention is selected from the base oils having an aromatic content of 0 to 45%, preferably 0 to 30%. The aromatic content of the oil is measured according to the UV-Burdett method. Without wishing to be bound by any theory, the aromaticity of the base oil is a characteristic that enables optimization of the action of the polymer as a function of temperature. The choice of an oil having a low aromatic content enables optimization at higher temperatures.

Advantageously, the lubricant composition of the present invention comprises at least 50% by weight base oil based on the total weight of the composition.

More advantageously, the lubricant composition of the present invention comprises at least 60 wt.%, Even at least 70 wt.% Base oil based on the total weight of the composition.

More particularly advantageously, the lubricant composition of the present invention comprises from 60 to 99.5% by weight of base oil, preferably from 70 to 99.5% by weight, based on the total weight of the composition.

A number of additives may be used in such lubricant compositions of the present invention.

Preferred additives for the lubricant compositions used in the present invention are selected from detergents, antiwear additives, friction modifiers different from organic molybdenum compounds, extreme pressure additives, dispersants, pour point depressants, defoamers, thickeners and mixtures thereof.

Preferably, the lubricant composition of the present invention comprises at least one anti-wear additive, at least one extreme pressure additive, or a mixture thereof.

The antiwear and extreme pressure additives protect this surface by forming a protective film that is adsorbed on the rubbing surface.

There are a wide variety of abrasion resistant additives. Preferably, for the lubricant compositions of the present invention, the wear-resistant additive is selected from phosphorus-sulfide additives such as metal alkyl thiophosphates, especially zinc alkyl thiophosphates, more specifically zinc dialkyl dithiophosphates or ZnDTP. Preferred compounds of the formula Zn ((SP (S) ( OR 1) (OR 2)) 2 to have the same or different and wherein R ² and R ³ are each independently an alkyl group, preferably having 1 to 18 carbon &Lt; / RTI &gt;

Amine phosphate is also an antiwear additive that can be used in the lubricant compositions of the present invention. However, the phosphorus contributed by these additives may act as a poison to the automotive catalytic system because these additives generate ash. This effect can be minimized by partially replacing the amine phosphate with a phosphorus-free additive, such as a polysulfide, for example, in particular, sulfurized olefin.

Advantageously, the lubricant composition of the present invention comprises from 0.01 to 6% by weight, preferably from 0.05 to 4% by weight, more preferably from 0.1 to 2% by weight, of the wear-resistant additive and extreme pressure additive, based on the total weight of the lubricant composition .

Advantageously, the lubricant composition of the present invention may comprise at least one additional friction modifying additive different from the organic molybdenum compound. Additional friction modifying additives may be selected from compounds providing metal elements and re-containing compounds. Among the compounds providing the metal element, mention may be made of transition metal complexes such as Mo, Sb, Sn, Fe, Cu and Zn, and the ligand thereof may be a hydrocarbon compound containing oxygen, nitrogen, sulfur or phosphorus atoms. Re-free friction modifying additives are generally of organic origin and include monoesters of fatty acids and polyols, fatty acid epoxides, borate fatty acid epoxides; Or fatty acid glycerol esters. According to the present invention, the fatty acid compound comprises at least one hydrocarbon group having from 10 to 24 carbon atoms.

Advantageously, the lubricant composition of the present invention comprises from 0.01 to 2%, or from 0.01 to 5%, preferably from 0.1 to 1.5%, or from 0.1 to 2%, by weight of the friction modifying additive, based on the total weight of the lubricant composition .

Advantageously, the lubricant composition of the present invention may comprise at least one antioxidant additive.

Antioxidant additives generally allow delayed deterioration of the lubricant composition in use. This deterioration can be notably interpreted as the formation of deposits, the presence of sludge or an increase in the viscosity of the lubricant composition.

The antioxidant additive acts as a radical inhibitor or hydroperoxide dissociation agent in particular. Of the frequently used antioxidant additives, phenolic type antioxidant additives, amino type antioxidant additives, phosphorus antioxidant additives can be mentioned. Some of these antioxidant additives, such as phosphorus-sulfur oxidation inhibitors, can produce ash. The phenolic antioxidant additive may be re-infiltrated only or may be in the form of a neutral or basic metal salt. The antioxidant additives include, in particular, hindered phenols including sterically hindered phenols, esters of sterically hindered phenols, and thioether bridges, diphenylamines, diphenylamines substituted by at least one C ₁ -C ₁₂ alkyl group, N, N ' -Dialkyl-aryl-diamines and mixtures thereof.

Preferably, according to the present invention, the sterically hindered phenols are those wherein at least one of the carbon-containing alcohol functional groups has at least one C ₁ -C ₁₀ alkyl group, preferably a C ₁ -C ₆ alkyl group, Is selected from compounds comprising a phenolic group substituted by a C ₄ alkyl group, preferably by a tert-butyl group.

Amino compounds are another class of antioxidant additives that can optionally be used in combination with phenolic antioxidant additives. Examples of amino compounds are aromatic amines such as aromatic amines of the formula NR ³ R ⁴ R ⁵ wherein R ³ is an optionally substituted aliphatic or aromatic group and R ⁴ is an optionally substituted aromatic group R ⁵ is a hydrogen atom, an alkyl group, an aryl group, a group represented by the formula R ⁶ S (O) _z R ⁷ wherein R ⁶ is an alkylene group or an alkenylene group, and R ⁷ is an alkyl group, And z is 0, 1, or 2.

Sulfurized alkylphenol, or an alkali metal or alkaline earth metal salt thereof, may also be used as the antioxidant additive.

Another class of antioxidant additives are those of copper compounds, such as copper thio- or dithiophosphate, copper and carboxylic acid salts, copper dithiocarbamates, sulfonates, phenates and acetylacetonates. Copper I and II salts, salts of succinic acid or anhydrides may also be used.

The lubricant compositions of the present invention may contain any type of antioxidant additives known to those of ordinary skill in the art.

Advantageously, the lubricant composition comprises at least one re-free antioxidant additive.

Also advantageously, the lubricant composition of the present invention comprises from 0.5 to 2% by weight, based on the total weight of the composition, of at least one antioxidant additive.

The lubricant composition of the present invention may also comprise at least one detergent additive.

Detergent additives generally allow for the reduction of the formation of deposits on the surface of the metal part by dissolving the secondary oxidation and combustion products.

Detergent additives that can be used in the lubricant compositions of the present invention are generally known to those of ordinary skill in the art. The detergent additive may be an anionic compound comprising a lipophilic hydrocarbon long chain and a hydrophilic head. The associated cations may be metal cations of alkali metals or alkaline earth metals.

Detergent additives are preferably selected from carboxylic acid salts, sulfonates, salicylates, naphthenates and phenate salts of alkali or alkaline earth metals. The alkali metals and alkaline earth metals are preferably calcium, magnesium, sodium or barium.

Such metal salts generally contain a stoichiometric amount or an excess, i.e., an amount of metal greater than the stoichiometric amount. They are also overbased detergent additives; The excess metal that imparts the overbased properties to the detergent additive is also generally in the form of an oil-insoluble metal salt, such as carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate.

Advantageously, the lubricant composition of the present invention may comprise from 2 to 4% by weight of detergent additive based on the total weight of the lubricant composition.

Also advantageously, the lubricant composition of the present invention may further comprise at least one pour point depressant additive.

By slowing the formation of paraffin crystals, pour point depressants generally improve the behavior of the lubricant compositions of the present invention at cold temperatures.

As examples of the pour point depressant additive, mention may be made of alkyl polymethacrylates, polyacrylates, polyaryl amides, polyalkyl phenols, polyalkyl naphthalenes, alkylated polystyrenes.

Advantageously, the lubricant composition of the present invention may also comprise at least one dispersant.

Dispersing agents may be selected from Mannich bases, succinimides and derivatives thereof.

Also advantageously, the lubricant composition of the present invention may comprise from 0.2% to 10% by weight of the dispersant based on the total weight of the lubricant composition.

The lubricant compositions of the present invention may also include at least one additional polymer that improves the viscosity index. As examples of additional polymers that improve the viscosity index, polymeric esters, homopolymers, or hydrogenated or non-hydrogenated copolymers of styrene, butadiene and isoprene, polymethacrylate (PMA) can be mentioned.

The invention also relates to the use of the inventive lubricant compositions for lubricating mechanical components, in particular transmissions and / or vehicle engines, preferably automotive engines.

The compositions of the present invention are notably distinguished between two surfaces, particularly between two surfaces in steel, between two carbon coated surfaces, or between surfaces in steel and carbon coated surfaces To reduce the friction between the two.

In a particularly advantageous manner, the invention relates to the use of the inventive lubricant compositions for lubricating carbon-coated mechanical components, notably transmissions and / or vehicle engines, preferably automotive engines, of at least one of these components . Preferably, one of the parts is carbon coated and the remainder (s) is of steel or carbon.

In a particularly advantageous manner, the compositions of the present invention are used to reduce friction between two surfaces (at least one of which is carbon coated), particularly in a vehicle engine, preferably an automotive engine, One is carbon coated, the other is steel, or the two surfaces are carbon coated.

In the present invention, &quot; carbon coating &quot; or &quot; carbon coated &quot; means any coating containing carbon. "Carbon coatings" notably refers to diamond coatings, especially nanodiamond coatings. Such coatings may in particular be in the form of at least one layer of nanocrystalline diamond having a purity in the range of from 70 to 99%. Preferably, the carbon coating has a purity in the range of 70 to 99%, preferably in the range of 70 to 97%, advantageously 75%, in the range of 0.1 to 3 μm, preferably in the range of 0.5 to 2 μm, advantageously 1.5 and a nanodiamond coating in the form of at least one layer of nanocrystalline diamond having a thickness of &lt; RTI ID = 0.0 &gt; m. &lt; / RTI &gt;

Such a carbon coating may also be selected from a coating of DLC type (Diamond Like Carbon). Any type of DLC coating may be used. In general, DLCs together form a group of family sets of amorphous materials that essentially contain carbon. Among these families, hydrogenated DLC, in particular a-C: H, and non-hydrogenated DLC, in particular a-C or ta-C, are used.

DLC has properties that vary as a function of their sp3 hybrid carbon content and hydrogen content. Some DLC modifications can be doped with metal elements such as iron, chromium or tungsten.

Compared to diamond coatings, DLC coatings generally have less mechanical and thermal resistance because they are amorphous materials. On the other hand, they are generally less roughened, and more particularly they can be deposited at low temperatures on most substrates. Preferably, the DLC is hydrogenated DLC, especially aC: H (containing 10-40% hydrogen).

Advantageously, the use of the lubricant compositions of the present invention is particularly advantageous in vehicle engines, preferably in automobiles, between two surfaces, in particular between two steel surfaces, between two carbon coated surfaces, or between a steel surface and a carbon coated surface Thereby preventing wear and tear, and even reducing wear between them.

The present invention also relates to the use of the lubricant compositions of the present invention to reduce fuel consumption of vehicles, particularly automobiles.

Advantageously, the present inventors have also found that the partially or fully neutralized amine salt of the present invention is more effective than the corresponding non-neutralized amine, especially with respect to the sealing portion, particularly the engine seal portion and, And it has proved to be compatible. In the present invention, the seal is a seal used in engine design and is generally a polymer seal, particularly preferably a fluoroelastomer seal. The compositions of the present invention notably enable limited wear of the engine seal, particularly in automotive engines, as compared to non-neutralized amines.

Accordingly, the present invention also relates to the use of the composition of the present invention for further reducing the deterioration of a seal contained in a vehicle engine, preferably an automobile.

The present invention also relates to a method of lubricating mechanical components, particularly transmissions and / or vehicle engines, particularly automotive engines, comprising at least one step of positioning at least one component in contact with the lubricant composition of the present invention . Preferably, at least one component is carbon coated and the remaining component (s) is steel or carbon coated.

The present invention also relates to a method for reducing friction between two surfaces of a vehicle engine, particularly an automobile, said method comprising at least one step of positioning at least one surface in contact with the lubricant composition of the present invention . Said surface being as defined above. In particular, the method relates to a reduction in friction between two steel surfaces, between two carbon coated surfaces, or between a steel surface and a carbon coated surface. Preferably, the invention relates to a method for reducing friction between two surfaces of a vehicle engine, in particular an automobile engine (at least one surface being carbon coated), said method comprising at least one surface, And at least one step of placing the composition in contact with the composition. Preferably, one of the surfaces is carbon coated and the remainder is steel, or the two surfaces are carbon coated.

Advantageously, in accordance with the method of the invention, particularly between two surfaces in a vehicle engine, preferably an automobile engine, in particular between two steel surfaces, between two carbon coated surfaces, or between a steel surface and a carbon coated surface It is possible to reduce, even to reduce, the wear of the tire.

Advantageously, with the method of the present invention, it is possible to at least reduce, without worsening, wear between two carbon coated surfaces.

The present invention also relates to a method for reducing fuel consumption of a vehicle, preferably an automobile, said method comprising at least one step of positioning a mechanical part of a vehicle engine in contact with a lubricant composition as defined above .

The engine of the present invention may be a two-stroke or four-stroke internal combustion engine. The engine may be a gasoline engine or diesel engine intended to power conventional petrol or diesel. In the present invention, &quot; conventional gasoline &quot; or &quot; conventional diesel &quot; means an engine that uses the fuel obtained after refining oil (for example, crude oil) of mineral origin as a power source. The engine may also be a gasoline engine or a diesel engine modified to powerfully use an oil-containing fuel derived from recycled materials such as alcohol-based fuel or biodiesel.

The vehicle of the present invention may be a light vehicle such as an automobile and a motorbike. Vehicles can also be heavy vehicles, construction equipment, vessels.

The transmission of the present invention may be a transmission, particularly a gearbox, used in lightweight vehicles such as automobiles.

The transmission of the present invention may be a heavy vehicle, a transmission used in construction equipment, especially a gear box or an axle.

The transmission of the present invention can also be a transmission used in industrial machines, in particular a gear or gear box for wind turbines.

A further aspect of the present invention is to provide a method of making a carbon-coated surface between an engine, particularly a vehicle engine and notably an automotive engine, between two surfaces, in particular between two steel surfaces, between a steel surface and a carbon- The use of a combination of a fully or partially neutralized amine salt as defined above and at least one organic molybdenum compound in a lubricant composition comprising at least one base oil for reducing friction.

A further aspect of the invention relates to a lubricant composition comprising at least one base oil for reducing friction between an engine, in particular a vehicle engine and, in particular, at least one carbon coated two surface in an automobile, Such as a combination of fully or partially neutralized amine salt and at least one organic molybdenum compound. Preferably, one of the surfaces is carbon and the remainder is steel, or both surfaces are carbon.

With such use, it is also advantageous to reduce wear, not deteriorate, especially between two surfaces of steel in a vehicle engine and preferably in an automotive engine, between a steel surface and a carbon coated surface, or between two carbon coated surfaces It is possible.

With this use, it is also possible to reduce, or even reduce, the wear between at least one carbon coated two surfaces, particularly in a vehicle engine, preferably an automotive engine. Preferably, one of the surfaces is carbon coated and the remainder is steel, or both surfaces are carbon coated.

The various uses mentioned above also enable reduced degradation of the seals contained in the vehicle engine, preferably automobiles.

The invention is described below with the aid of non-limiting embodiments.

Example 1: Evaluation of the compatibility of these compositions with the lubricant compositions of the present invention, the preparation of comparative lubricant compositions, and the seals used in automotive engines.

The lubricant composition of Reference 1 was prepared according to the following Table 1 (composition given in weight (g)).

Base oil 1: Group III base oil (dynamic viscosity measured at 40 캜 according to standard ASTM D445 = 20 mm ² / s);

- Base oil 2: Group III base oil (standard dynamic viscosity = 25 mm ² / s in a 40 ℃ measured according to ASTM D445);

- viscosity index improvers: hydrogenated styrene / isoprene polymers;

Additive pack: anti-wear agent of the zinc dithiophosphate type, antioxidant of the diphenylamine type, detergent of the calcium salicylate type (P6660® marketed by Infineum);

- Pour point depressants: polymethacrylates (Lubrizol 7748®, marketed by Lubrizol);

- amine 1: neutralized fatty acid diamine (Duomeen TDO® marketed by Akzo Nobel);

- Amine 2: a non-neutralized fatty acid diamine (Duomeen T® marketed by Akzo Nobel);

- Friction modifier: molybdenum dithiocarbamate (Sakuralube 525® marketed by Adeka).

Lubricant composition
Reference 1 Base oil 1 78.0 Base oil 2 3.1 Viscosity index improver 5.3 Additive pack 13.3 Pour point depressant 0.3

The lubricant compositions and comparative compositions of the present invention were prepared according to the following Table 2 (composition given in weight (g)).

Composition One Comparison 1 Comparison 2 Lubricant composition
Reference 1 98.6 98.6 99.6 Amine 1 1.0 Amine 2 1.0 Friction modifier 0.4 0.4 0.4

The compatibility of the prepared lubricant compositions with an elastomeric seal of type RE1 was evaluated according to standard CEC-L-39-T96 and the results obtained are shown in Table 3 below.

The
Composition 1 Comparative Composition 1 Comparative Composition 2 Fluorocarbon
Compatibility of RE 1 elastomer
Deviation from breaking load compared to new seal%
Deviation in breaking elongation compared to new seal%
Deviation in volume compared to new seal%

-56.3%

-65.5%

+ 1.5%


-70.1%

-76.1%

+ 4%


-2.4%

-0.2%

+ 1.5%

The results show that the lubricant composition of the present invention (Composition 1) comprising a combination of neutralized amine and organic molybdenum compound exhibits better performance compared to the lubricant composition (Comparative Composition 1) comprising a combination of non-neutralized amine and organic molybdenum compound Good compatibility with the seal used for the engine, especially the fluoroelastomer seal.

Example 2: Evaluation of the lubricant compositions of the present invention, the preparation of comparative lubricant compositions, and their friction reduction properties to DLC / steel contact.

Lubricant Composition Reference 2 was prepared according to Table 4 below (composition given in weight (g)).

Base oil: Group III base oil (dynamic viscosity measured at 40 占 폚 according to standard ASTM D445 = 19 mm ² / s);

- viscosity index improvers: hydrogenated styrene / isoprene polymers;

- additive packs: dispersants, detergents of calcium phenate, carboxylate and sulfonate type;

- Pour point depressants: polymethacrylates (Viscoplex 1-358® marketed by Evonik);

- amine 1: neutralized fatty acid diamine (Duomeen TDO® marketed by Akzo Nobel);

- Amine 2: a non-neutralized fatty acid diamine (Duomeen T® marketed by Akzo Nobel);

- amine 3: neutralized fatty acid triamine (Armolube 312® marketed by Akzo Nobel);

- Amine 4: non-neutralized fatty acid triamine (Triameen YT® marketed by Akzo Nobel);

- Friction modifier: molybdenum dithiocarbamate (Sakuralube 525® marketed by Adeka).

Lubricant composition
Reference 2 Base oil 84.8 Viscosity index improver 3.5 Additive pack 0.2 Pour point depressant 11.5

The lubricant compositions and comparative compositions of the present invention were prepared according to Table 5 below (composition given in weight (g)).

Composition 2 3 Comparison 3 Comparison 4 Compare 5 Compare 6 Compare 7 Lubricant composition reference 2 98.6 98.6 98.6 98.6 99.6 99.0 99.0 Amine 1 1.0 1.0 Amine 2 1.0 Amine 3 1.0 1.0 Amine 4 1.0 Friction modifier 0.4 0.4 0.4 0.4 0.4

The first test was used to evaluate the friction characteristics of the lubricant composition.

The coefficient of friction was evaluated using a linear tribometer, DLC bead / steel plane under the following conditions:

- Type of steel: 100c6;

- type of the bead-like DLC coating: includes hydrogen of 31 to 33%, and having a molar ratio of 55:45 (sp ² carbon / carbon sp ³⁾ a: CH hydrogenated DLC;

Thickness of DLC layer: 1.5 mu;

- Temperature: 110 ° C,

A normal load of 5 N;

- Travel distance of 10 mm.

A second test for evaluating the friction characteristics of the lubricant composition was also performed to enable the characterization of the engine friction to an operating point representing the point scanned during the NEDC cycle (New European Driving Cycle).

The test engine was a H4BT engine by RENAULT corresponding to a 3-cylinder multipoint indirect injection gasoline engine, which meets the EURO 5 standard.

The unburned heat engine was propelled by the generator at the desired speed. In this type of test, the fluid (coolant and lubricant) was temperature-controlled because no combustion occurred. The torque provided by the generator to propel the heat engine was measured at each operating point. A comparison between the propulsive torque of an engine with different lubricants has made it possible to identify lubricants that exhibit the best friction characteristics.

The test operating point is as follows:

- Engine speed (rpm): 4000-3500-3000-2500-2000-1500-1000-750

- Adjusted lubricant temperature in the manifold: 40 ° C - 60 ° C - 90 ° C - 110 ° C

- Controlled water temperature at the engine outlet: 40 ° C - 60 ° C - 90 ° C - 100 ° C

At the completion of this test, the lower the value obtained, the better the friction reduction characteristics of the tested lubricant.

The properties of the prepared lubricant compositions were evaluated and the results are provided in Table 6 below.

Composition 2 3 Comparison 3 Comparison 4 Compare 5 Compare 6 Compare 7 Coefficient of friction of DLC / steel 0.05 0.08 0.1 0.06 0.09 0.1 0.09 Propelling torque 88 80 119 87 81 119 91

The results show that the lubricant compositions of the present invention (compositions 2 and 3) comprising a combination of neutralized amine and organic molybdenum compound exhibit a friction-reducing characteristic especially for DLC / steel contact, which is a combination of a non-neutralized amine and an organic molybdenum compound (Comparative compositions 3 and 4) comprising a combination of the lubricant compositions (comparative compositions 3 and 4), and even better.

Claims (16)

Use of a lubricant composition for reducing friction between at least one carbon coated two surfaces comprising:
At least one base oil;
At least one organic molybdenum compound;
At least one fully or partially neutralized amine salt, wherein the amine satisfies the formula (I) wherein the acid neutralizing acid is selected from monoacids of formula (II) .
RN (X) -Y (I)
(Wherein,
R is a linear or branched, fully saturated hydrocarbon radical having 2 to 24 carbon atoms, preferably 4 to 24, more preferably 14 to 24, in particular 16 to 24, for example 18 to 24 carbon atoms Or a partially saturated hydrocarbon group;
X is a linear or branched, fully or partially saturated hydrocarbon group having 1 to 24 carbon atoms, preferably 1 to 10 carbon atoms, especially 1 to 8 carbon atoms, a benzyl group, -R ¹ - [NH-R ² ] _n -NH ₂ ;
Y is a hydrogen atom, a linear or branched, fully or partially saturated hydrocarbon group having 1 to 24 carbon atoms, preferably 1 to 10 carbon atoms, especially 1 to 8 carbon atoms, a benzyl group, -R ¹ - [NH-R ² ] _n -NH ₂ ;
n is an integer from 0 to 3, preferably from 0 to 2, preferably 0 or 1;
The same or different R ¹ and R ² are linear or branched alkyl groups having 2 to 4 carbon atoms, preferably 2 to 3 carbon atoms, preferably CH ₂ CH ₂ or CH ₂ CH ₂ CH ₂ ego;
At least one of X and Y is a hydrogen atom or -R ¹ - [NH-R ² ] _n -NH ₂ ;
At least one of X, Y or R is a linear or branched, saturated or unsaturated, saturated or unsaturated hydrocarbon radical having from 4 to 24 carbon atoms, preferably from 14 to 24 carbon atoms, in particular from 16 to 24 carbon atoms, Of fully or partially saturated hydrocarbon groups)
R'COOH (II)
Wherein R 'is a linear or branched, fully or partially saturated hydrocarbon group having from 2 to 24 carbon atoms, The use according to claim 1, wherein the amine satisfies the following formula (Ia):
RN (X) -R ¹ - [NHR ² ] _n -NH ₂ (Ia)
Wherein R, X, R ¹ , R ² and n have the definition given in claim 1,
At least one of X or R is a linear or branched fully unsaturated hydrocarbon radical having from 4 to 24 carbon atoms, preferably from 14 to 24 carbon atoms, in particular from 16 to 24 carbon atoms, for example from 18 to 24 carbon atoms. Or a partially saturated hydrocarbon group. 3. The method according to claim 1 or 2,
R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;
X is a hydrogen atom, a linear or branched alkyl group having from 2 to 8 carbon atoms, a benzyl group, or a group of the formula -R ¹ - [NH-R ² ] _n -NH ₂ . 4. The method according to any one of claims 1 to 3,
R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;
X is a hydrogen atom or a group of the formula -R ¹ - [NH-R ² ] _n -NH ₂ . 5. The method according to any one of claims 1 to 4,
R is a linear or branched, fully or partially saturated hydrocarbon group having from 14 to 24, in particular from 16 to 24, for example from 18 to 24 carbon atoms;
Y is -R ¹ - [NH-R ² ] _n -NH ₂ ;
n = 0;
R ¹ is CH ₂ CH ₂ CH ₂ ;
Wherein X is CH ₂ CH ₂ CH ₂ NH ₂ or H. 6. The composition according to any one of claims 1 to 5, wherein the molar ratio between the number of moles of nitrogen atoms in the amine and the number of moles of the acid of formula (II) in the composition is from 9: 1 to 1: 1, Is from 5: 1 to 1: 1. 7. Compounds according to any one of claims 1 to 6, wherein R ' is a radical having from 7 to 24 carbon atoms, preferably from 10 to 24, for example from 14 to 20, in particular from 16 to 20 carbon atoms Linear or branched, fully or partially saturated hydrocarbon group. 8. The use according to any one of claims 1 to 7, wherein the organic molybdenum compound is a molybdenum dithiocarbamate compound. 9. Use according to any one of claims 1 to 8, wherein the amine is selected from the following amines:
RNHCH ₂ CH ₂ CH ₂ CNH ₂ wherein R is a linear or branched, fully or partially saturated hydrocarbon group having from 16 to 18 carbon atoms; or
_{N (R) (CH 2 CH} 2 CH 2 NH 2) (CH 2 CH 2 CH 2 NH 2) ( wherein, R is the hydrocarbon saturation in a whole or in part, of a linear or branched having from 16 to 18 carbon atoms ). 10. Use according to any one of claims 1 to 9, wherein said composition comprises from 0.05 to 5% by weight, preferably from 0.1 to 2% by weight, of said neutralized amines relative to the total weight of said composition. 11. The composition according to any one of claims 1 to 10, wherein the composition comprises from 0.01 to 3% by weight, preferably from 0.05 to 3% by weight, for example from 0.1 to 2% by weight, based on the total weight of the composition, Molybdenum compound. 12. The composition according to any one of claims 1 to 11, wherein the composition further comprises at least one anti-wear additive, which is preferably a phosphorus, sulfide or phosphorus-sulfide compound, preferably zinc dithiophosphate &Lt; / RTI &gt; 13. Use according to any one of the preceding claims for reducing friction in a vehicle engine, preferably an automobile. 14. Use according to any one of the preceding claims for reducing friction between a steel surface and a carbon coated surface in a vehicle engine, preferably an automobile. 14. Use according to any of the claims 1 to 13 for reducing friction between two carbon coated surfaces in a vehicle engine, preferably an automobile. 16. Use according to any one of the claims 1 to 15 for further reducing the deterioration of seals contained in a vehicle engine, preferably an automobile.