Antimicrobial Metal Working Fluids

Abstract

Aqueous alkaline metal working fluids and concentrates thereof and processes for their use are disclosed. Processes to reduce the presence of Mycobacteria in a metal working environment are also disclosed.

1 . A process for reducing the presence of  Mycobacteria  in an aqueous alkaline metal working environment, comprising providing to the metal working environment an aqueous metal working fluid incorporating a  Mycobacterium  inhibitory amount of at least one amine of formula Ia or Ib: 
     
       
         
         
             
             
         
       
       wherein each R 1  is independently C 2 -C 18  alkyl; and 
       wherein each R 2  and R 3  is independently C 2 -C 4  alkylene. 
     
   
   
       2 . The process according to  claim 1  wherein said aqueous metal working fluid further comprises a workpiece corrosion inhibitor. 
   
   
       3 . The process according to  claim 2  wherein said workpiece corrosion inhibitor comprises ethanolamine combined with boric acid, a triazole compound, an organic carboxylic acid having 6-10 carbon atoms, a dicarboxylic acid having 10-14 carbon atoms, or any combination thereof. 
   
   
       4 . The process according to  claim 1  wherein said aqueous metal working fluid comprises about 10 to about 10,000 ppm of said at least one amine. 
   
   
       5 . The process according to  claim 1  wherein said aqueous metal working fluid comprises about 3,000 to about 6,000 ppm of said at least one amine. 
   
   
       6 . The process according to  claim 1  wherein said aqueous metal working fluid comprises about 3,000 ppm of said at least one amine. 
   
   
       7 . The process according to  claim 1  wherein said aqueous metal working fluid further comprises a film-forming additive, an antifoaming agent, or both. 
   
   
       8 . The process according to  claim 1  wherein the aqueous alkaline metal working fluid remains stable after exposure to workpiece-tool contact zone working temperatures. 
   
   
       9 . The process according to  claim 1  wherein the aqueous alkaline metal working fluid remains effective against growth of  Mycobacterium  after exposure to a workpiece-tool contact zone working pressure of greater than about 60 psi. 
   
   
       10 . The process according to  claim 1  wherein said aqueous metal working fluid comprises at least about 41% to about 99% water. 
   
   
       11 . A process for reducing the presence of  Mycobacteria  in an aqueous alkaline metal working environment, comprising providing to the metal working environment an aqueous metal working fluid incorporating a  Mycobacterium  inhibitory amount of at least one amine of formula Ia or Ib: 
     
       
         
         
             
             
         
       
       wherein each R 1  is independently C 2 -C 10  alkyl; and 
       wherein each R 2  and R 3  is independently C 2 -C 4  alkylene. 
     
   
   
       12 . The process according to  claim 11  wherein said aqueous metal working fluid further comprises a workpiece corrosion inhibitor. 
   
   
       13 . The process according to  claim 12  wherein said workpiece corrosion inhibitor comprises ethanolamine combined with boric acid, a triazole compound, an organic carboxylic acid having 6-10 carbon atoms, a dicarboxylic acid having 10-14 carbon atoms, or any combination thereof. 
   
   
       14 . The process according to  claim 11  wherein said aqueous metal working fluid comprises about 10 to about 10,000 ppm of said at least one amine. 
   
   
       15 . The process according to  claim 11  wherein said aqueous metal working fluid comprises about 3,000 to about 6,000 ppm of said at least one amine. 
   
   
       16 . The process according to  claim 11  wherein said aqueous metal working fluid comprises about 3,000 ppm of said at least one amine. 
   
   
       17 . The process according to  claim 11  wherein said aqueous metal working fluid further comprises a film-forming additive, an antifoaming agent, or both. 
   
   
       18 . The process according to  claim 11  wherein the aqueous alkaline metal working fluid remains stable after exposure to workpiece-tool contact zone working temperatures. 
   
   
       19 . The process according to  claim 11  wherein the aqueous alkaline metal working fluid remains effective against growth of  Mycobacterium  after exposure to a workpiece-tool contact zone working pressure of greater than about 60 psi. 
   
   
       20 . The process according to  claim 11  wherein said aqueous metal working fluid comprises at least about 41% to about 99% water.