Solid lubricant, lubricating coating agent for metal material, surface-treated metal material, and method for forming lubricating coating for metal material

Abstract

Provided is a solid lubricant that is non-black in color and capable of reducing industrial waste (environmental conservation), and further capable of achieving a balance among excellent lubricity, moisture absorption resistance, and corrosion resistance in a heavy working region, and a lubricating coating agent including the solid lubricant. A solid lubricant including carrier particles including a lipophilic lubricating component that is at least one of an oil, an extreme-pressure agent, a soap, and a wax between particles of and/or between layers of at least one layered clay mineral selected from the group consisting of natural products and synthetic products of a smectite group, a vermiculite group, a mica group, a brittle mica group, a pyrophyllite group, and a kaolinite group.

1 . A solid lubricant comprising carrier particles including a lipophilic lubricating component that is at least one of an oil, an extreme-pressure agent, a soap, and a wax between particles of and/or layers of at least one layered clay mineral selected from the group consisting of natural products and synthetic products of a smectite group, a vermiculite group, a mica group, a brittle mica group, a pyrophyllite group, and a kaolinite group. 
     
     
         2 . The solid lubricant according to  claim 1 , wherein an aspect ratio is 3 to 150 in a cross section of the layered clay mineral. 
     
     
         3 . The solid lubricant according to  claim 1 , wherein the lipophilic lubricating component has a solubility parameter (SP value) of 10 or less. 
     
     
         4 . The solid lubricant according to  claim 1 , wherein the layered clay mineral is 40° or more in water contact angle. 
     
     
         5 . The solid lubricant according to  claim 1 , wherein the layered clay mineral is 30 μm or less in average particle size. 
     
     
         6 . The solid lubricant according to  claim 1 , wherein an inclusion amount of the lipophilic lubricating component is 5 mass % or more in mass ratio to a total mass of the carrier particles. 
     
     
         7 . The solid lubricant according to  claim 1 , wherein the layered clay mineral has Mohs hardness of 2 or less. 
     
     
         8 . The solid lubricant according to  claim 1 , wherein the solid lubricant is used for a lubricating coating agent for plastic working of a metal material. 
     
     
         9 . A water-based lubricating coating agent for a metal material, wherein a component comprising at least the solid lubricant according to  claim 1  is dispersed in water, and wherein a concentration of the solid lubricant is 5 mass % or higher in mass ratio to a mass of a total solid content in the lubricating coating agent. 
     
     
         10 . An oil-based lubricating coating agent for a metal material, wherein a component comprising at least the solid lubricant according to  claim 1  is dispersed in an oil, and wherein a concentration of the solid lubricant is 5 mass % or higher in mass ratio to a mass of a total solid content in the lubricating coating agent. 
     
     
         11 . A powder-based lubricating coating agent for a metal material, which contains a component comprising at least the solid lubricant according to  claim 1 , wherein a concentration of the solid lubricant is 5 mass % or higher in mass ratio to a mass of a total solid content in the lubricating coating agent. 
     
     
         12 . A surface-treated metal material wherein a coating obtained by using the lubricating coating agent for a metal material according to  claim 9  is formed on/over a metal material surface to be 0.5 g/m 2  or more as a dried coating amount. 
     
     
         13 . A method for forming a lubricating coating for a metal material, the method comprising a contact step of bringing a metal material into contact with the lubricating coating agent for a metal material according to  claim 9 . 
     
     
         14 . The method for forming a lubricating coating for a metal material according to  claim 13 , the method further comprising a chemical conversion treatment step of coating a surface of the metal material with a chemical conversion coating before the contact step. 
     
     
         15 . A surface-treated metal material wherein a coating obtained by using the lubricating coating agent for a metal material according to  claim 10  is formed on/over a metal material surface to be 0.5 g/m2 or more as a dried coating amount. 
     
     
         16 . A method for forming a lubricating coating for a metal material, the method comprising a contact step of bringing a metal material into contact with the lubricating coating agent for a metal material according to  claim 10 . 
     
     
         17 . The method for forming a lubricating coating for a metal material according to  claim 16 , the method further comprising a chemical conversion treatment step of coating a surface of the metal material with a chemical conversion coating before the contact step. 
     
     
         18 . A surface-treated metal material wherein a coating obtained by using the lubricating coating agent for a metal material according to  claim 11  is formed on/over a metal material surface to be 0.5 g/m2 or more as a dried coating amount. 
     
     
         19 . A method for forming a lubricating coating for a metal material, the method comprising a contact step of bringing a metal material into contact with the lubricating coating agent for a metal material according to  claim 11 . 
     
     
         20 . The method for forming a lubricating coating for a metal material according to  claim 19 , the method further comprising a chemical conversion treatment step of coating a surface of the metal material with a chemical conversion coating before the contact step.