Anti-corrosive particles

Abstract

The present invention relates to dispersion of surface modified inorganic particles including (a) fluid comprising a complexing agent, and (b) the surface modified inorganic particles comprising polyvalent metal ions.

The invention claimed is: 
     
       1. A dispersion of surface modified inorganic particles comprising:
 (a) fluid comprising (i) water and (ii) a complexing agent comprising acidic or basic materials, and 
 (b) particles dispersed throughout said fluid, said particles consisting of surface modified inorganic particles having an average particle diameter of less than about 10 microns, wherein each surface modified inorganic particle consists of (i) an inorganic particle having a particle surface and (ii) polyvalent metal ions along said particle surface, said polyvalent metal ions having replaced protons of hydroxyl groups along said particle surface. 
 
     
     
       2. A dispersion according to  claim 1  wherein said average particle diameter is less than about 3 micron. 
     
     
       3. A dispersion according to  claim 1 , wherein said average particle diameter is less than about 1 micron. 
     
     
       4. A dispersion according to  claim 1 , wherein the inorganic particles consist of silica, silicate, alumina, aluminosilicate, titania, zirconia, ceria or mixtures thereof; and the polyvalent metal ions consist of calcium, zinc, cobalt, lead, strontium, lithium, barium, magnesium, manganese, cerium, aluminum, or mixtures thereof. 
     
     
       5. A dispersion according to  claim 1  wherein the inorganic particles are in a form of a gel, a colloidal, a precipitate, fumed particles, or mixtures thereof. 
     
     
       6. A dispersion according to  claim 1 , wherein said complexing agent comprises phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof. 
     
     
       7. A dispersion of surface modified inorganic particles comprising:
 (a) fluid comprising a complexing agent, said complexing agent comprising (i) phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof, or (ii) one or more alkanolamines, and 
 (b) particles dispersed throughout said fluid, said particles consisting of surface modified inorganic particles, wherein each surface modified inorganic particle consists of (i) an inorganic particle having a particle surface and (ii) polyvalent metal ions along said particle surface, said polyvalent metal ions having replaced protons of hydroxyl groups along said particle surface. 
 
     
     
       8. A dispersion according to  claim 7 , wherein said surface modified inorganic particles have an average particle diameter of less than about 10 microns. 
     
     
       9. A dispersion according to  claim 7 , wherein said surface modified inorganic particles have an average particle diameter of less than about 5 microns. 
     
     
       10. A dispersion according to  claim 7 , wherein the inorganic particles consist of silica, silicate, alumina, aluminosilicate, titania, zirconia, ceria or mixtures thereof; and the polyvalent metal ions consist essentially of calcium, zinc, cobalt, lead, strontium, lithium, barium, magnesium, manganese, cerium or mixtures thereof. 
     
     
       11. A dispersion according to  claim 7 , wherein the inorganic particles are in the form of a gel, a colloidal, a precipitate, fumed particles, or mixtures thereof. 
     
     
       12. A dispersion according to  claim 7 , wherein said fluid further comprises at least one of water, binder, film former, bacteriacide and polymer. 
     
     
       13. A dispersion according to  claim 7 , wherein said complexing agent comprises phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof. 
     
     
       14. A dispersion according to  claim 7 , wherein said dispersion is made by a process of milling said surface modified inorganic particles in the presence of the complexing agent. 
     
     
       15. A method of making the dispersion according to  claim 7 , said method comprising:
 (a) mixing the surface modified inorganic particles with the fluid comprising the complexing agent; and 
 (b) milling the inorganic particles in the presence of the complexing agent to form an average diameter of less than about 10 microns for the surface modified inorganic oxide particles. 
 
     
     
       16. A method according to  claim 15 , wherein said complexing agent comprises phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof. 
     
     
       17. An inorganic oxide dispersion made by the method according to  claim 15 . 
     
     
       18. A dispersion according to  claim 2 , wherein the inorganic particles consist of silica, silicate, alumina, or aluminosilicate; and the polyvalent metal ions consist of calcium. 
     
     
       19. A dispersion according to  claim 18 , wherein said complexing agent comprises phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof. 
     
     
       20. A dispersion according to  claim 19 , wherein said complexing agent comprises 2-hydroxyphosphonoacetic acid. 
     
     
       21. A dispersion according to  claim 19 , wherein said fluid further comprises a bacteriacide. 
     
     
       22. A dispersion according to  claim 10 , wherein said surface modified inorganic particles have an average particle diameter of less than about 5 microns. 
     
     
       23. A dispersion according to  claim 22 , wherein said complexing agent comprises phosphorus acid, phosphoric acid, tri- and polyphosphoric acids, organophosphonic acids or mixtures thereof. 
     
     
       24. A dispersion according to  claim 23 , wherein said fluid further comprises water and a bacteriacide. 
     
     
       25. A dispersion according to  claim 24 , wherein said particles have an average particle diameter of less than about 1.0 micron, and each surface modified inorganic particle consists of (i) a silica, silicate, alumina, aluminosilicate, titania, zirconia or ceria particle having a particle surface and (ii) calcium, zinc, cobalt, lead, strontium, lithium, barium, magnesium or manganese ions along said particle surface. 
     
     
       26. A dispersion according to  claim 25 , wherein said complexing agent comprises 2-hydroxyphosphonoacetic acid. 
     
     
       27. A dispersion according to  claim 23 , wherein said fluid further comprises aluminate ions therein. 
     
     
       28. A dispersion according to  claim 22 , wherein said complexing agent comprises one or more alkanolamines. 
     
     
       29. A dispersion of surface modified inorganic particles comprising:
 (a) fluid comprising a complexing agent, said complexing agent being selected from the group consisting of 2-hydroxyphosphonoacetic acid, glycolic acid, 1,2,3-benzotriazole, 2-mercaptobenzothiazole, and (2-benzothiazolythio)succinic acid; and 
 (b) surface modified inorganic particles dispersed throughout said fluid, said surface modified inorganic particles having an average particle diameter of less than about 5 microns and comprising (i) silica, silicate, alumina, aluminosilicate, titania, zirconia or ceria particles or mixtures thereof with each inorganic particle having a particle surface and (ii) polyvalent metal ions selected from the group consisting of calcium, zinc, cobalt, lead, strontium, lithium, barium, magnesium, manganese, cerium, aluminum, or mixtures thereof along said particle surface, said polyvalent metal ions having replaced protons of hydroxyl groups along said particle surface. 
 
     
     
       30. A dispersion according to  claim 29 , wherein said complexing agent comprises 2-hydroxyphosphonoacetic acid. 
     
     
       31. A dispersion according to  claim 29 , wherein said complexing agent comprises 1,2,3-benzotriazole, 2-mercaptobenzothiazole or (2-benzothiazolythio)succinic acid. 
     
     
       32. A dispersion according to  claim 29 , wherein said surface modified inorganic particles have an average particle diameter of less than about 1.0 micron and comprise (i) silica particles with a silica particle surface and (ii) calcium ions forming at least a portion of said silica particle surface.