Lubricant for water-miscible metal working oil

Abstract

The present invention provides a lubricant for water-based metal working oil containing polyether (E) represented by the following general formula (1) and having an HLB of 6.1 to 16.0 and a weight-average molecular weight of 500 to 10,000 R 1 [{(OCH 2 CH 2 CH 2 CH 2 ) m /(OA 1 ) n }(OA 2 ) p —OH] q   (1) [in the formula, R 1 denotes a residue such that at least one hydroxyl group is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s); A 1 denotes an alkylene group with a carbon number of 2 to 4 except a 1,4-butylene group; A 2 denotes an alkylene group with a carbon number of 2 to 4; m denotes an integer of 1 or more having an average of 1 to 120; n and p each denotes an integer of 0, 1 or more such that an average of (n+p) is 1 to 200, and n and p are not simultaneously 0; q denotes an integer of 1 to 6; and {(OCH 2 CH 2 CH 2 CH 2 ) m /(OA 1 ) n } in a case where n is an integer of 1 or more denotes a random bond], and water-based metal working oil containing said lubricant. They are superior in lubricity to steel materials as well as, particularly, lubricity to soft metal such as aluminum, and excellent because of stability on dilution with water and non-separation property.

1 . A lubricant for water-based metal working oil containing polyether (E) represented by the following general formula (1) and having an HLB of 6.1 to 16.0 and a weight-average molecular weight of 500 to 10,000  
       R 1 [{(OCH 2 CH 2 CH 2 CH 2 ) m /(OA 1 ) n }(OA 2 ) p —OH] q   (1)  
     [in the formula, R 1  denotes a residue such that at least one hydroxyl group is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s); A 1  and A 2  each denotes an ethylene group or a 1,2-propylene group; m denotes an integer of 1 or more having an average of 1 to 120; n and p each denotes an integer of 0, 1 or more such that an average of (n+p) is 1 to 200, n or p is 0, and n and p are not simultaneously 0; q denotes an integer of 1 to 6; and {(OCH 2 CH 2 CH 2 CH 2 ) m /(OA 1 ) n } in a case where n is an integer of 1 or more denotes a random bond].  
   
   
       2 . (canceled)  
   
   
       3 . The lubricant according to  claim 1 , 
 wherein R 1  in the general formula (1) is a residue such that all hydroxyl groups are removed from dihydric or trihydric alcohol.    
   
   
       4 . The lubricant according to  claim 1 , 
 wherein A 2  in the general formula (1) is an ethylene group.    
   
   
       5 . The lubricant according to  claim 1 , 
 wherein m/(m+n+p) in the general formula (1) is 0.05 to 0.8.    
   
   
       6 . A lubricant composition for water-based metal working oil 
 which comprises the polyether (E) according to  claim 1  and other additives.    
   
   
       7 . The lubricant composition according to  claim 6 , 
 wherein other additives are aliphatic carboxylic acid with a carbon number of 8 to 22 and/or a salt thereof (F).    
   
   
       8 . The lubricant composition according to  claim 7 , 
 wherein (F)/(E) is 0.03 to 5.0 at a weight ratio.    
   
   
       9 . The lubricant composition according to  claim 6 , 
 which contains, as other additives, one kind or more selected from the group consisting of an antioxidant, an extreme-pressure additive, a rust preventive and an antifoaming agent.    
   
   
       10 . The lubricant composition according to  claim 6 , 
 which does not contain hydrocarbon oil as other additives.    
   
   
       11 . A water-based metal working oil comprising water and the lubricant or the lubricant composition according to  claim 1 , 
 said water-based metal working oil containing polyether (E) of 0.01 to 95 weight % in quantity on a basis of a weight of said metal working oil.    
   
   
       12 . The water-based metal working oil according to  claim 11 , 
 which is of solution type or soluble type.    
   
   
       13 . The water-based metal working oil according to  claim 11 , 
 which is employed for working aluminum, aluminum alloy, iron and/or steel.