Anti-corrosive paintings and coatings containing nanoparticles

Abstract

The present invention refers to a formulation for anticorrosion paints and coatings, based on epoxy, polyurethane, acrylic, alkylic, polyester resins and mixtures thereof, dissolved in organic or inorganic solvent and comprising a multitude of mostly bi-dimensionally developed nanoparticles, with a few hundred and about one nanometer, respectively, as to lateral dimensions and thickness, wherein the viscosity of the formulation is lower than 55000 mPa·s.

1 . An anticorrosion paint or coating formulation comprising an epoxy, polyurethane, acrylic, alkydic or polyester resin or a mixture thereof and comprising a multitude of mostly bi-dimensionally developed nanoparticles, with a few hundred and about one nanometer, respectively, as to lateral dimensions and thickness, wherein said nanoparticles consist of materials containing ions available for ion exchange reactions, previously treated by ion exchange reaction with ions of long chain molecules having at least 16 carbon atoms, the rotational viscosity of the formulation at 10 rpm being lower than 55000 mPa·s 
     
     
         2 . The anticorrosion paint or coating formulation of  claim 1 , wherein the viscosity of the formulation is lower than 40000 mPa·s. 
     
     
         3 . The anticorrosion paint or coating formulation of  claim 2 , wherein the amount of said nanoparticles is lower than 2% by weight, based on the total weight of the formulation. 
     
     
         4 . The anticorrosion paint or coating formulation of  claim 3 , wherein the amount of said nanoparticles is lower than 1% by weight, based on the total weight of the formulation. 
     
     
         5 . The anticorrosion paint or coating formulation of  claim 4 , wherein the amount of said nanoparticles is equal to 0.5% by weight, based on the total weight of the formulation. 
     
     
         6 . The anticorrosion paint or coating formulation of  claim 4  wherein said nanoparticles consist of silico-aluminate based materials. 
     
     
         7 . The anticorrosion paint or coating formulation of  claim 6 , wherein said nanoparticles consist of montmorillonite. 
     
     
         8 . The anticorrosion paint or coating formulation of  claim 5 , wherein said long chain molecule ions are obtained by protonising amines or other compounds compatible with other formulation components. 
     
     
         9 . Formulation for anticorrosion paints and coatings, based on epoxy, polyurethane, acrylic, alkylic, polyester resins and mixtures thereof comprising a multitude of mostly bi-dimensionally developed nanoparticles, with a few hundred and about one nanometer, respectively, as to lateral dimensions and thickness, wherein said nanoparticles consist of materials containing ions available for ion exchange reactions, previously treated by ion exchange reaction with ions of long chain molecules having at least 16 carbon atoms. 
     
     
         10 . The anticorrosion paint or coating formulation according to  claim 1 , wherein said nanoparticles consist of bentonite. 
     
     
         11 . A method for preparing an anticorrosion paint or coating formulation comprising:
 a) treating nanoparticles by ion exchange reaction to obtain nanoparticles comprising at least 16 carbon atom hydrophobic chains attached to a surface of said nanoparticles; and   b) adding less than 1% by weight of said obtained nanoparticles to the paint or coating formulation, based on the total weight of the formulation, thereby obtaining an anticorrosion paint or coating formulation having a viscosity lower than 55000 mPa·s at 10 rpm.   
     
     
         12 . The method of  claim 11 , wherein the 16 carbon atom hydrophobic chains are octadecylamine chains. 
     
     
         13 . The method of  claim 11  wherein said nanoparticles consist of silicoaluminate based materials. 
     
     
         14 . The method of  claim 11 , wherein said nanoparticles consist of montmorillonite. 
     
     
         15 . The method of  claim 11 , wherein said nanoparticles consist of bentonite.