Lubricant composition based on fatty triamines

Abstract

A lubricant composition includes at least one base oil, at least one organomolybdenum compound, at least one compound including a dithiophosphate group and at least one fatty triamine. The lubricant composition has good friction properties for both steel/steel contacts and steel/carbon coating contacts, as well as for carbon coating/carbon coating contacts, whilst retaining good anti-wear properties.

1 . A lubricant composition comprising:
 at least one base oil,   at least one organomolybdenum compound,   at least one compound comprising a dithiophosphate group, and   at least one fatty triamine.   
     
     
         2 . The lubricant composition according to  claim 1  in which the organomolybdenum compound is a molybdenum dithiocarbamate compound. 
     
     
         3 . The lubricant composition according to  claim 1  in which the organomolybdenum compound is a molybdenum complex comprising at least one compound selected from:
 (a) the compounds of formula (I) 
 
       
         
           
           
               
               
           
         
         in which:
 X 1 represents an oxygen atom or a nitrogen atom; 
 X 2  represents an oxygen atom or a nitrogen atom; 
 n represents 1 when X 1  represents an oxygen atom and m represents 1 when X 2  represents an oxygen atom; 
 n represents 2 when X 1  represents a nitrogen atom and m represents 2 when X 2  represents a nitrogen atom; 
 R 1  represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms; 
 
         the compounds of formula (II) 
       
       
         
           
           
               
               
           
         
         in which:
 X 1  represents an oxygen atom or a nitrogen atom; 
 X 2  represents an oxygen atom or a nitrogen atom; 
 n represents 1 when X 1  represents an oxygen atom and m represents 1 when X 2  represents an oxygen atom; 
 n represents 2 when X 1  represents a nitrogen atom and m represents 2 when X 2  represents a nitrogen atom; 
 R 1  represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms; 
 R 2  represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms; and 
 
         (b) a mixture of at least one compound of formula (I) and at least one compound of formula (II). 
       
     
     
         4 . The lubricant composition according to  claim 3  in which the molybdenum complex comprises at least one compound of formula (I-a) 
       
         
           
           
               
               
           
         
       
       in which R 1  represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms. 
     
     
         5 . The lubricant composition according to  claim 3  in which the molybdenum complex comprises at least one compound of formula (II-a) 
       
         
           
           
               
               
           
         
       
       in which R 1  represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms. 
     
     
         6 . The lubricant composition according to  claim 1  in which the content by weight of organomolybdenum compound ranges from 0.05 to 3% with respect to the total weight of the lubricant composition. 
     
     
         7 . The lubricant composition  claim 1  in which the compound comprising a dithiophosphate group is selected from the group constituted by the ammonium dithiophosphates, amine dithiophosphates, ester dithiophosphates and metal dithiophosphates, alone or in a mixture. 
     
     
         8 . The lubricant composition according to  claim 1  in which the compound comprising a dithiophosphate group is a compound of formula (VII) 
       
         
           
           
               
               
           
         
       
       in which:
 R 18  represents a linear or branched, saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 30 carbon atoms; 
 R 19  represents a linear or branched, saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 30 carbon atoms; 
 M represents a metal cation, preferably a Zn 2+ cation; and 
 n represents the valency of the metal cation. 
 
     
     
         9 . The lubricant composition according to any  claim 1  in which the compound comprising a dithiophosphate group is a compound of formula (VII-a) or formula (VII-b): 
       
         
           
           
               
               
           
         
       
       in which:
 R 18  represents a linear or branched, saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 30 carbon atoms; and 
 R 19  represents a linear or branched, saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 30 carbon atoms. 
 
     
     
         10 . The lubricant composition according to any  claim 1  in which the content by weight of compound comprising a dithiophosphate group ranges from 0.1 to 5% with respect to the total weight of the lubricant composition. 
     
     
         11 . The lubricant composition according to  claim 1  in which the fatty triamine is selected from:
 the compounds of formula (VIII)
   R 20 —N—[(CH 2 ) 3 —NH 2 ] 2    (VIII)
 
 
 
       in which R 20  represents a linear or branched, saturated or unsaturated alkyl group, comprising at least 10 carbon atoms; and
 the compounds of formula (IX)
   R 21 —NH—(CH 2 —CH 2 —CH 2 —NH) 2 —H   (IX)
 
 
 
       in which R 21  represents a linear or branched, saturated or unsaturated alkyl group, comprising at least 10 carbon atoms. 
     
     
         12 . The lubricant composition according to  claim 1  in which the content by weight of fatty triamine ranges from 0.1 to 5% with respect to the total weight of the lubricant composition. 
     
     
         13 . The lubricant composition according to  claim 1  in which the mass ratio (organomolybdenum compound/fatty triamine) ranges from 1/10 to 1 
     
     
         14 . The lubricant composition according to  claim 1  in which the mass ratio (organomolybdenum compound/compound comprising a dithiophosphate group/fatty triamine) ranges from 1/10/10 to 1/1/1. 
     
     
         15 . The lubricant composition according to  claim 1  further comprising at least one additive selected from the detergents, anti-wear additives different from ammonium dithiophosphates, amine dithiophosphates, ester dithiophosphates and metal dithiophosphates, extreme pressure additives, dispersants, pour-point improvers, anti-foaming agents, thickeners and mixtures thereof. 
     
     
         16 . A method comprising reducing friction between two steel surfaces, between two carbon-covered surfaces or between a steel surface and a carbon-covered surface in a vehicle engine, the method further comprising bringing the surfaces into contact with a lubricant composition comprising:
 at least one base oil,   at least one organomolybdenum compound,   at least one compound comprising a dithiophosphate group, and   at least one fatty triamine.   
     
     
         17 - 18 . (canceled) 
     
     
         19 . A method comprising bringing a mechanical part of a vehicle engine into contact with a lubricant composition, and reducing fuel consumption of vehicles, the lubricant composition comprising:
 at least one base oil,   at least one organomolybdenum compound,   at least one compound comprising a dithiophosphate group, and   at least one fatty triamine.   
     
     
         20 . A composition of additives concentrate comprising:
 at least one organomolybdenum compound,   at least one compound comprising a dithiophosphate group, and   at least one fatty triamine.