Article treated with silica particles and method for treating a surface of the article

Abstract

An article including a substrate, and a base layer formed on a surface of the substrate, and methods for treating the surface of the substrate are provided.

1 . A method for treating a surface of a substrate, comprising:
 coating a surface of a substrate with a dispersion liquid containing silica particles;   drying the substrate coated with the dispersion liquid to form a base layer on the surface of the substrate; and   applying a coating layer on the base layer.   
     
     
         2 . The method of  claim 1 , wherein an average size of the silica particles is about 1 μm or less. 
     
     
         3 . The method of  claim 1 , wherein the silica particles are porous. 
     
     
         4 . The method of  claim 1 , wherein about 95% or more of the silica particles have a size of about 40% to about 160% of an average particle size of the silica particles. 
     
     
         5 . The method of  claim 1 , wherein the dispersion liquid comprises water, an organic liquid, or a mixture thereof. 
     
     
         6 . The method of  claim 1 , wherein the method repeats the following one or more times:
 coating a surface of a substrate with the dispersion liquid containing silica particles; and   drying the substrate coated with the dispersion liquid to form a base layer on the surface of the substrate.   
     
     
         7 . The method of  claim 1 , wherein the method further comprises heat-treating the substrate on which the base layer is formed. 
     
     
         8 . The method of  claim 7 , wherein the heat-treating is carried out at a temperature ranging from about 50° C. to about 900° C. 
     
     
         9 . The method of  claim 1 , wherein the substrate comprises a material selected from the group consisting of metals, glass, ceramics, vinyl, masonry, concrete, natural stones, artificial stones and plastics. 
     
     
         10 . The method of  claim 1 , wherein the method further comprises removing impurities present on the surface of the substrate before coating the surface of the substrate with the dispersion liquid. 
     
     
         11 . The method of  claim 1 , wherein the coating layer comprises paint. 
     
     
         12 . A method for treating a surface of a metal substrate, comprising:
 coating a surface of a metal substrate with a dispersion liquid containing silica particles;   drying the metal substrate coated with the dispersion liquid to form a base layer on the surface of the metal substrate;   heat-treating the metal substrate on which the base layer is formed; and   applying a coating layer to the base layer.   
     
     
         13 . The method of  claim 12 , wherein about 95% or more of total silica particles have a size of about 40% to about 160% of an average particle size of the silica particles. 
     
     
         14 . The method of  claim 12 , wherein heat-treating the metal substrate comprises heating the metal substrate at a temperature ranging from about 50° C. to about 900° C. 
     
     
         15 . The method of  claim 12 , wherein an average size of the silica particles is about 20 nm to about 1 μm. 
     
     
         16 . A method for treating substrate comprising:
 dispersing silica particles in a solvent to form a liquid dispersion, wherein the solvent comprises water, an organic liquid, or combinations thereof;   applying the liquid dispersion to a substrate; and   removing at least a portion of the solvent from the liquid dispersion applied to the substrate to form a base layer on the substrate, wherein the base layer comprises at least a portion of the silica particles; and   heating the base layer at a temperature ranging from about 50° C. to about 900° C.   
     
     
         17 . The method of  claim 16 , further comprising applying a coating layer to a side of the base layer opposite the substrate, wherein the base layer improves adhesion between the substrate and the coating layer. 
     
     
         18 . The method of  claim 16 , wherein an average size of the silica particles is about 20 nm to about 1 μm. 
     
     
         19 . The method of  claim 16 , wherein the base layer has a thickness less than 1 μm. 
     
     
         20 . The method of  claim 16 , wherein the substrate comprises a metal.