AQUEOUS LUBRICANT FOR PLASTIC WORKING OF METAL MATERIAL AND HAVING SUPERIOR GAS CLOGGING RESISTANCE AND POST-MOISTURE ABSORPTION WORKABILITY

摘要

The present invention is intended to solve problems of the prior art, and an object of the invention is to provide a water-based lubricant for plastic working of a metallic material, which is comparable or superior in workability to lubricating treatment such as zinc phosphate + soap treatment and conventional coating-type water-based lubricants, and excellent in workability after moisture absorption and scum clogging resistance. A water-based lubricant for plastic working of a metallic material is characterized in that the water-based lubricant is obtained by adding to a water-based medium: (A) a polymer and/or a salt thereof containing a carboxylic acid or a derivative thereof as a constituent monomer; (B) an oxoacid of tungsten, of silicon, or of phosphorus, or a condensate thereof, and/or a salt thereof; (C) a hydroxide of an alkali metal; and (D) a lubricating component (D), and the solid content weight ratio (A)/[(A) + (B) + (C) + (D)] is 0.05 to 0.4.