Photocatalytic coating material having photocatalytic activity and adsorption property and method for preparing the same

Abstract

Disclosed is a photocatalytic coating sol composition and the method for preparing the same. The photocatalityc coating sol composition comprising 0.1% to 20% by weight of a photo-catalyst, 0.1% to 10% by weight of an inorganic adsorbent, 1% to 20% by weight of an inorganic binder, 55% to 95% by weight of an organic solvent and if necessary 0.1% by weight to 10% by weight of a metal compound. Specifically, the present invention can remove harmful substances by coating photocatalytic coating sol composition prepared from photocatalyst, inorganic adsorbent, inorganic binder, metal compound and organic solvent on metal filter such as aluminum etc., and plastic filter such as polyethylene and polypropylene etc. used in environmental contaminants treatment system or air conditioning plant such as air-conditioner and air-cleaner, according to any one of and ordinary coating techniques such as spray method or dipping method etc. at room temperature.

1 . A photocatalytic coating sol composition comprising 0.1% to 20% by weight of a photocatalyst, 0.1% to 10% by weight of an inorganic adsorbent, 1% to 20% by weight of an inorganic binder, and 55% to 95% by weight of an organic solvent.  
     
     
         2 . The photocatalytic coating sol composition according to  claim 1 , further comprising 0.1% to 10% by weight of a metal compound.  
     
     
         3 . The photocatalytic coating sol composition according to  claim 2 , wherein the metal compound is selected from the group consisting of copper compound, silver compound, bengala, vermilion, cadmium red, yellow earth, cadmium yellow, emerald rock, chromium oxide green, Prussian blue, cobalt blue, manganese and carbon black.  
     
     
         4 . The photocatalytic coating sol composition according to  claim 1 , wherein the photocatalyst is selected from the group consisting of TiO 2 , ZnO 2 , ZnO, CaTiO, WO 3 , SnO 2 , MoO 3 , Fe 2 O 3 , InP, GaAs, BaTiO 3 , KNbO 3 , Fe 2 O 3 , and Ta 2 O 5 .  
     
     
         5 . The photocatalytic coating sol composition according to  claim 4 , wherein the average diameter of the photocatalyst particles is 5 to 50 nm.  
     
     
         6 . The photocatalytic coating sol composition according to  claim 1 , wherein the inorganic adsorbent is silicates compound of magnesium or calcium, talc, diatomite, or zeolite coated with silver and/or copper ion.  
     
     
         7 . The photocatalytic coating sol composition according to  claim 1 , wherein the inorganic binder is an isopropoxide compound or a silane compound.  
     
     
         8 . The photocatalytic coating sol composition as according to  claim 1 , wherein the organic solvent is an alcohol having lower alkyl group.  
     
     
         9 . A method for the preparation of a photocatalytic coating sol composition, comprising the steps of: 
 stirring at 1000 to 1500 rpm at room temperature for 10 to 30 min after mixing 1% to 20% by weight of an inorganic binder, 55% to 95% by weight of an organic solvent and 0.1% to 0.5% by weight of a strong acid or a strong base if necessary; and    treating for 10 to 15 min in an ultrasonic device after adding 0.1% to 20% by weight of a photocatalyst powder and 0.1% to 10% by weight of an inorganic adsorbent to the mixture, and adding 0.1% to 10% by weight of metal a compound to the mixture, if necessary.    
     
     
         10 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 1  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         11 . The substrate according to  claim 10 , wherein the substrate is aluminum filter, a polyethylene filter or a polypropylene filter.  
     
     
         12 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 2  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         13 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 3  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         14 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 4  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         15 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 5  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         16 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 6  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         17 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 7  using a printing method, a spraying method or a dipping method, and followed by drying.  
     
     
         18 . A substrate prepared by coating the photocatalytic coating sol composition according to  claim 8  using a printing method, a spraying method or a dipping method, and followed by drying.