Water-soluble metalworking fluid

Abstract

Provided is a water-soluble metalworking oil comprising a base oil (A) comprising oil-soluble polyalkylene glycol (A1), wherein a total content of water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 60% by mass based on the total amount excluding water.

1 . A water-soluble metalworking oil comprising a base oil (A) comprising oil-soluble polyalkylene glycol (A1), wherein a total content of water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 60% by mass based on the total amount excluding water. 
     
     
         2 . The water-soluble metalworking oil according to  claim 1 , wherein the total content of water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 10 parts by mass based on 100 parts by mass of the total amount of component (A1). 
     
     
         3 . The water-soluble metalworking oil according to  claim 1 , which is substantially free of a sulfuric extreme pressure agent. 
     
     
         4 . The water-soluble metalworking oil according to  claim 1 , further comprising water (B). 
     
     
         5 . The water-soluble metalworking oil according to  claim 1 , wherein the content of component (A1) in component (A) is 10 to 100% by mass based on the total amount of component (A) contained in the water-soluble metalworking oil. 
     
     
         6 . The water-soluble metalworking oil according to  claim 1 , wherein the content of component (A1) is 0.01% by mass or more based on the total amount of the water-soluble metalworking oil excluding water. 
     
     
         7 . The water-soluble metalworking oil according to  claim 1 , further comprising an amine compound (C). 
     
     
         8 . The water-soluble metalworking oil according to  claim 1 , further comprising a fatty acid (D). 
     
     
         9 . The water-soluble metalworking oil according to  claim 1 , further comprising a nonionic surfactant (E). 
     
     
         10 . The water-soluble metalworking oil according to  claim 1 , which is an emulsion-type oil classified as A1 as stipulated in JIS K 2241:2017. 
     
     
         11 . The water-soluble metalworking oil according to  claim 1 , which is a soluble-type oil classified as A2 as stipulated in JIS K 2241:2017. 
     
     
         12 . A water-soluble metalworking oil comprising a base oil (A) comprising oil-soluble polyalkylene glycol (A1), wherein a total content of water-soluble polyalkylene glycol and methoxypolyethylene glycol is less than 10 parts by mass based on 100 parts by mass of the total amount of component (A). 
     
     
         13 . A metalworking fluid obtained by blending the water-soluble metalworking oil of  claim 1  with dilution water. 
     
     
         14 . A metalworking method comprising processing a workpiece comprising metal by application of the metalworking fluid according to  claim 13 . 
     
     
         15 . The metalworking method according to  claim 14 , wherein the workpiece has a member comprising at least iron or aluminum. 
     
     
         16 . The metalworking method according to  claim 14 , wherein corrosion of a copper-containing member constituting a processing machine used in processing of the workpiece is suppressed.