Anti-corrosive paintings and coatings containing nanoparticles
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. Anticorrosion paint or printer formulation comprising paint solids, an epoxy, polyurethane, acrylic, alkydic or polyester resin or mixture thereof and greater than 0% and less than 1% by weight platelet shaped nanoparticles, based on the total weight of the formulation, wherein octadecylammonium ions are attached to a surface of the nanoparticles, and wherein the rotational viscosity of the formulation at 10 rpm is above 26600 mPa·s and lower than 55000 mPa·s.
2. The anticorrosion paint or primer formulation according to claim 1 , wherein the viscosity of the formulation is lower than 40000 mPa·s.
3. The anticorrosion paint or primer formulation according to claim 1 wherein said nanoparticles consist of silica-aluminate based materials.
4. The anticorrosion paint or primer formulation according to claim 1 , wherein said nanoparticles consist of montmorillonite.
5. The anticorrosion paint or primer formulation according to claim 1 , wherein said nanoparticles consist of bentonite.
6. The anticorrosion paint or primer formulation according to claim 1 , wherein the formulation includes a bisphenol A epoxy base.
7. Method for preparing an anticorrosion paint or primer formulation comprising:
a) treating platelet-shaped nanoparticles by ion exchange reaction to obtain nanoparticles comprising at least 16 carbon atom hydrophobic chains attached to a surface of said nanoparticles wherein octadecylammonium ions are attached to a surface of the nanoparticles; and
b) adding less than 1% by weight of said obtained nanoparticles based on the total weight of the formulation, to a paint or primer base comprising paint solids and an epoxy, polyurethane, acrylic, alkydic or polyester resin or mixture thereof, and thereby obtaining an anticorrosion paint or primer formulation having a viscosity above 26600 mPa s and lower than 55000 mPa·s at 10 rpm.
8. The method according to claim 7 wherein said nanoparticles consist of silico-aluminate based materials.
9. The method according to claim 7 , wherein said nanoparticles consist of montmorillonite.
10. The method according to claim 7 , wherein said nanoparticles consist of bentonite.