Metal product with excellent moldability surface-treated with alkali-soluble lubricant

Abstract

A surface-lubricated metal product, with excellent shapability, comprising a metal having coated on both surfaces, or one surface, thereof an alkali-soluble lubricating film mainly comprising an alkali-soluble polyurethane aqueous composition containing a carboxyl group or a sulfonic acid group within the molecule, and a lubricating function-imparting agent in an amount of 1 to 30 mass % based on the alkali-soluble polyurethane aqueous composition, the film being coated to have a film thickness of 0.5 to 10 μm and the elastic modulus of the film after coating being 0.5 to 20 GPa at 25° C.

1 . A surface-lubricated metal product with excellent shapability, comprising a metal having coated on both surfaces or on one surface thereof an alkali-soluble lubricating film mainly comprising (A) an alkali-soluble polyurethane aqueous composition containing a carboxyl group or a sulfonic acid group within the molecule and (B) a lubricating function-imparting agent in an amount of 1 to 30 mass % based on said alkali-soluble polyurethane aqueous composition, said film being coated to have a film thickness of 0.5 to 10 μm and the elastic modulus of said film after coating being 0.5 to 20 GPa at 25° C.  
     
     
         2 . The surface-lubricated metal product with excellent shapability as claimed in  claim 1 , wherein the alkali-soluble lubricating film mainly comprises (A) an alkali-soluble polyurethane aqueous composition, (B) a lubricating function-imparting agent in an amount of 1 to 30 mass % based on said alkali-soluble polyurethane aqueous composition and (c) silica particles in an amount of 1 to 30 mass % based on said alkali soluble polyurethane aqueous composition.  
     
     
         3 . The surface-lubricated metal product with excellent shapability as claimed in  claim 1  or  2 , wherein the amount of the acid radical contained in the alkali-soluble polyurethane aqueous composition (A) constituting the alkali-soluble lubricating film is from 30 to 180 in terms of the acid value.  
     
     
         4 . The surface-lubricated metal product with excellent shapability as claimed in  claim 1  or  2 , wherein a neutralizer for the acid radical contained in the alkali-soluble polyurethane aqueous composition (A) constituting the alkali-soluble lubricating film is sodium hydroxide or potassium hydroxide.  
     
     
         5 . The surface-lubricated metal product with excellent shapability as claimed in any one of  claims 1  to  4 , wherein the main component of the alkali-soluble polyurethane aqueous composition (A) constituting the alkali-soluble lubricating film is a polyester polyol.  
     
     
         6 . The surface-lubricated metal product with excellent shapability as claimed in any one of  claims 1  to  5 , wherein the lubricating function-imparting agent (B) comprises one or more member selected from the group consisting of a polyolefin-base wax, a paraffin-base wax, a stearic acid-base solid lubricant and a wax comprising a fluorine-containing resin.  
     
     
         7 . The surface-lubricated metal product with excellent shapability as claimed in any one of  claims 1  to  6 , wherein the elastic modulus of said film after coating is 0.5 to 6 GPa at 25° C. and, at the same time, the tensile elongation percentage of the alkali-soluble polyurethane aqueous composition (A) as the main component of said film exceeds 10%, or, the elastic modulus of said film after coating exceeds 6 GPa at 25° C. and, at the same time, the tensile elongation percentage of the alkali-soluble polyurethane aqueous composition (A) as the main component of said film, is 10% or less.  
     
     
         8 . The surface-lubricated metal product with excellent shapability as claimed in any one of  claims 1  to  7 , wherein the glass transition temperature of the alkali-soluble polyurethane aqueous composition (A) in the coated lubricating film is  100 ° C. or more.  
     
     
         9 . A surface-lubricated metal product with excellent shapability, comprising a metal having coated on both surfaces or one surface thereof an alkali-soluble lubricating film mainly comprising (A) an alkali-soluble polyurethane aqueous composition containing a carboxyl group or a sulfonic acid group within the molecule and (B) a lubricating function-imparting agent in an amount of 1 to 30 mass % based on said alkali-soluble polyurethane aqueous composition, the main component of the alkali-soluble polyurethane aqueous composition being a polyester polyol, a neutralizer for the acid radical contained in the alkali-soluble polyurethane aqueous composition (A) being sodium hydroxide or potassium hydroxide, the amount of the acid radical contained in the alkali-soluble polyurethane aqueous composition (A) being from 30 to 180 in terms of the acid value, the lubricating function-imparting agent (B) comprising one or more member selected from the group consisting of a polyolefin-base wax, a paraffin-base wax, a stearic acid-base solid lubricant and a wax comprising a fluorine-containing resin, the alkali-soluble lubricating film being coated to have a film thickness of 0.5 to 10  82  m. the elastic modulus of said film after coating being 0.5 to 6 GPa at 25° C. and, at the same time, the tensile elongation percentage of the alkali-soluble polyurethane aqueous composition (A) as the main component of said film exceeding 10%, or the elastic modulus of said film after coating exceeding 6 GPa at 25° C. and, at the same time, the tensile elongation percentage of the alkali-soluble polyurethane aqueous composition (A) as the main component of said film being 10% or less, and the glass transition temperature of the alkali-soluble polyurethane aqueous composition (A) being 100° C. or more.  
     
     
         10 . The surface-lubricated metal product with excellent shapability as claimed in  claim 9 , which further comprises (C) silica particles in an amount of 1 to 30 mass % based on the alkali-soluble polyurethane aqueous composition.