Use of alkanolamines based on propylene oxide as additives in lubricants

Abstract

A lubricant which comprises an alkanolamine of the formula I of the formula II of the formula III of the formula IV or a mixture of alkanolamines selected from alkanolamines of the formulae I to IV, where R1, R2, R3, R1′, R2′ and R3′ are each independently a hydrogen atom or a C1 to C4 alkyl group, and R 4 is a C1 to C16 alkyl group.

1 . A lubricant which comprises an alkanolamine of the formula I 
       
         
           
           
               
               
           
         
       
       of the formula II 
       
         
           
           
               
               
           
         
       
       of the formula III 
       
         
           
           
               
               
           
         
       
       of the formula IV 
       
         
           
           
               
               
           
         
       
       or a mixture of alkanolamines selected from alkanolamines of the formulae I to IV,
 where R1, R2, R3, R1′, R2′ and R3′ are each independently a hydrogen atom or a C1 to C4 alkyl group, and R 4  is a C1 to C16 alkyl group. 
 
     
     
         2 . The lubricant according to  claim 1 , wherein R4 is a C1 to C4 alkyl group. 
     
     
         3 . The lubricant according to  claim 1  or  2 , wherein R 1  is identical to R 1′ , R 2  to R 2′ , and R 3  to R 3′ . 
     
     
         4 . The lubricant according to any of  claims 1  to  3 , wherein R1, R2, R3, R1′, R2′ and R3′ are each a hydrogen atom. 
     
     
         5 . The lubricant according to any of  claims 1  to  4 , which is a mixture of alkanolamines comprising alkanolamines of the formulae I and II. 
     
     
         6 . The lubricant according to any of  claims 1  to  5 , which is a mixture of alkanolamines consisting to an extent of at least 80% by weight of an alkanolamine of the formula I. 
     
     
         7 . The lubricant according to any of  claims 1  to  6 , which comprises the alkanolamine or the mixture of the alkanolamines in amounts of 0.05 to 30% by weight. 
     
     
         8 . The lubricant according to any of  claims 1  to  7 , which comprises aqueous lubricants. 
     
     
         9 . The lubricant according to any of  claims 1  to  8 , which comprises aqueous solutions or emulsions. 
     
     
         10 . The lubricant according to any of  claims 1  to  9 , which comprises aqueous solutions or emulsions of synthetic or nonsynthetic mineral oils. 
     
     
         11 . The lubricant according to any of  claims 1  to  10 , which comprises further additives selected from additives for adjusting viscosity, additives for reducing corrosion, additives for reducing foam formation, additives for reducing friction, biocides and optionally other additives for improving performance properties. 
     
     
         12 . The lubricant according to any of  claims 1  to  11 , which comprises cooling lubricants. 
     
     
         13 . The use of lubricants according to any of  claims 1  to  11  as lubricants in the manufacture of components or in conveying activities. 
     
     
         14 . The use of lubricants according to any of  claims 1  to  11  in transmissions or turbines.