| abstract |
The invention provides a water-soluble metal working lubricant which is suitable for press working of aluminum and excellent in both working and degreasing properties. The water-soluble metal working lubricant comprises (A) at most 85% by mass of water, (B) 5 to 75% by mass of a metal salt of an organic carboxylic acid wherein the carboxylic acid residue has eight or more carbon atoms in total and the acid/alkali molar ratio is 1 : 0.5 to 1.1, (C) 1 to 50% by mass of at least one metal salt selected from among metal salts of organic phosphoric esters, metal salts of organic phosphorous esters, metal salts of organic phosphonic acids, and metal salts of organic boric esters, each of which bears an alkyl group having eight or more carbon atoms in total, and (D) 10 to 80% by mass of a nonionic surfactant. |