Ammonium-based ionic liquid and its use as a lubricant additive

Abstract

A method to reduce and/or eliminate and/or delay the corrosion in the internal parts of a combustion engine, includes at least a step of application to said engine of an ammonium-based ionic liquid compound of formula (I)[CAT+] [X−]  (I)wherein [CAT+] is tri-n-octylmethylammonium and [X−] is selected from compounds of formula (IA):wherein R is selected from linear or branched alkyl and alkenyl groups comprising from 2 to 8 atoms of carbon.

1 . Method to reduce and/or eliminate and/or delay the corrosion in the internal parts of a combustion engine, the method comprising at least a step of application to said engine of an ammonium-based ionic liquid compound of formula (I)
   [CAT + ] [X − ]  (I)
   wherein   [CAT + ] is tri-n-octylmethylammonium and   [X − ] is selected from compounds of formula (IA):   
       
         
           
           
               
               
           
         
         wherein R is selected from linear or branched alkyl and alkenyl groups comprising from 2 to 8 atoms of carbon. 
       
     
     
         2 . The method according to  claim 1 , wherein in formula (IA), R represents a linear or branched alkyl group comprising from 2 to 8 atoms of carbon. 
     
     
         3 . The method according to  claim 2 , wherein in formula (IA), R represents a linear or branched alkyl group comprising from 4 to 8. 
     
     
         4 . The method according to  claim 3 , wherein R represents a linear or branched alkyl group comprising from 5 to 7 carbon atoms. 
     
     
         5 . The method according to  claim 4 , wherein [X − ] is 2-ethylhexanoate. 
     
     
         6 . The method according to  claim 1 , wherein the lubricant composition is a marine lubricant. 
     
     
         7 . The method according to  claim 6 , wherein the ammonium-based ionic liquid compound of formula (I) is comprised in a lubricant composition comprising:
 from 30.0 to 99.95% of at least one base oil,   from 0.05 to 15.0% of ammonium-based ionic liquid compound of formula (I).   
     
     
         8 . The method according to  claim 7 , wherein the lubricant composition comprises:
 from 30.0 to 94.0% of at least one base oil,   from 0.05 to 15.0% of the ammonium-based ionic liquid compound of formula (I),   from 1 to 35% of at least one detergent selected from neutral and overbased detergents having a Total Base Number according to ASTM D2896 of from 20 to 450 mg KOH/g,   
       the percentages being defined by weight of component with respect to the total weight of the composition. 
     
     
         9 . The method according to  claim 8 , wherein the percentage by weight of ammonium-based ionic liquid relative to the total weight of lubricant composition is selected such that a total base number provided by the ammonium-based ionic liquid represents at least 3% of the overall base number of the lubricant composition. 
     
     
         10 . The method according to  claim 8 , wherein the percentage by weight of ammonium-based ionic liquid of formula (I) is selected such that a total base number provided by the compounds of formula (I) represents a contribution of at least 0.5 milligrams of potash per gram of lubricant, to the overall base number of the lubricant composition. 
     
     
         11 . The method according to  claim 1 , wherein the combustion engine is a marine engine. 
     
     
         12 . The method according to  claim 11 , wherein the marine engine is a two stroke marine engine. 
     
     
         13 . The method according to  claim 1 , wherein the ammonium-based ionic liquid or the lubricant composition is applied to the cylinder wall, by a pulse lubricating system or by spraying the ionic liquid or the composition onto the piston's rings pack through an injector.