Coating compositions exhibiting corrosion resistance properties, related coated substrates, and methods

• US 20070048550A1
• Filed: 08/26/2005
• Published: 03/01/2007
• Est. Priority Date: 08/26/2005
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Schneider, John, Hung, Cheng-Hung, Vanier, Noel, Millero, Edward
• Application Number:
  US11/213,136
• Publication Number:
  US 20070048550A1
• Time in Patent Office: Days
• US Class Current: 428/704
• CPC Class Codes: C08K 2201/005 Additives being defined by their particle size in general
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C09D 5/084 Inorganic compounds
• CPC Class Codes: C09D 7/48 Stabilisers against degradation by oxygen, light or heat
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

Coating compositions are disclosed that include corrosion resisting particles such that the coating composition can exhibit corrosion resistance properties. Also disclosed are substrates at least partially coated with a coating deposited from such a composition and multi-component composite coatings, wherein at least one coating layer is deposited from such a coating composition. Methods and apparatus for making ultrafine solid particles are also disclosed.

Claims

1. A coating composition comprising:

(1) an adhesion promoting component, and

(2) corrosion resisting particles having a calculated equivalent spherical diameter of no more than 200 nanometers and comprising a plurality of inorganic oxides.

2. The coating composition of claim 1, wherein at least one inorganic oxide comprises zinc, cerium, yttrium, magnesium, molybdenum, lithium, aluminum, tin, or calcium.

3. The coating composition of claim 1, wherein the corrosion resisting particles are selected from (i) particles comprising oxides of cerium, zinc, and silicon;

(ii) particles comprising oxides of calcium, zinc and silicon;

(iii) particles comprising oxides of phosphorous, zinc and silicon;

(iv) particles comprising oxides of yttrium, zinc, and silicon;

(v) particles comprising oxides of molybdenum, zinc, and silicon;

(vi) particles comprising oxides of boron, zinc, and silicon;

(vii) particles comprising oxides of cerium, aluminum, and silicon, (viii) particles comprising oxides of magnesium or tin and silica, and (viii) particles comprising oxides of cerium, boron, and silicon, or a mixture thereof.

4. The coating composition of claim 3, wherein the corrosion resisting particles comprise oxides of cerium, zinc, and silicon.

5. The coating composition of claim 1, wherein the composition is substantially free of chromium containing material.

6. The coating composition of claim 1, wherein the corrosion resisting particles are substantially free of zirconium.

7. The coating composition of claim 1, wherein the corrosion resisting particles are selected from particles comprising:

(i) 10 to 25 percent by weight zinc oxide, 0.5 to 25 percent by weight cerium oxide, and 50 to 89.5 percent by weight silica;

(ii) 10 to 25 percent by weight zinc oxide, 0.5 to 25 percent by weight calcium oxide, and 50 to 89.5 percent by weight silica;

(iii) 10 to 25 percent by weight zinc oxide, 0.5 to 25 percent by weight yttrium oxide, and 50 to 89.5 percent by weight silica;

(iv) 10 to 25 percent by weight zinc oxide, 0.5 to 50 percent by weight phosphorous oxide, and 25 to 89.5 percent by weight silica;

(v) 10 to 25 percent by weight zinc oxide, 0.5 to 50 percent by weight boron oxide, and 25 to 89.5 percent by weight silica;

(vi) 10 to 25 percent by weight zinc oxide, 0.5 to 50 percent by weight molybdenum oxide, and 25 to 89.5 percent by weight silica;

(vii) 0.5 to 25 percent by weight cerium oxide, 0.5 to 50 percent by weight boron oxide, and 25 to 99 percent by weight silica;

(viii) 0.5 to 25 percent by weight cerium oxide, 0.5 to 50 percent by weight aluminum oxide, and 25 to 99 percent by weight silica;

(ix) 0.5 to 75 percent by weight magnesium or tin oxide, and 25 to 99.5 percent by weight silica;

(x) 0.5 to 25 percent by weight cerium oxide, 0.5 to 25 percent by weight zinc oxide, 0.5 to 25 percent by weight boron oxide, and 25 to 98.5 percent by weight silica;

(xi) 0.5 to 25 percent by weight yttrium oxide, 0.5 to 25 percent by weight phosphorous oxide, 0.5 to 25 percent by weight zinc oxide, and 25 to 98.5 percent by weight silica;

(xii) 0.5 to 5 percent by weight yttrium oxide, 0.5 to 5 percent by weight molybdenum oxide, 0.5 to 25 percent by weight zinc oxide, 0.5 to 5 percent by weight cerium oxide and 60 to 98 percent by weight silica;

and mixtures thereof,

wherein the percent by weights are based on the total weight of the particles.

8. The coating composition of claim 1, wherein the corrosion resisting particles are prepared by a process comprising:

(a) introducing a reactant into a plasma chamber;

(b) heating the reactant by means of a plasma as the reactant flows through the plasma chamber, yielding a gaseous reaction product;

(c) contacting the gaseous reaction product with a plurality of quench streams injected into the reaction chamber through a plurality of quench gas injection ports, wherein the quench streams are injected at a flow rate and injection angle that results in the impingement of the quench streams with each other within the gaseous reaction product stream, thereby producing ultrafine solid particles; and

(d) passing the ultrafine solid particles through a converging member.

9. The coating composition of claim 8, wherein the reactants comprise a solid material.

10. The coating composition of claim 1, further comprising a film-forming resin.

11. The coating composition of claim 10, wherein the film-forming resin comprises a polyvinyl polymer.

12. The coating composition of claim 11, wherein the polyvinyl polymer comprises a polyvinyl butyral resin.

13. The coating composition of claim 1, wherein the adhesion promoting component comprises phosphatized epoxy resin and/or a free acid selected from tannic acid, gallic acid, phosphoric acid, phosphorous acid, citric acid, malonic acid, a derivative thereof, or a mixture thereof.

14. The coating composition of claim 1, further comprising conventional non-chrome corrosion resisting pigment particles selected from iron phosphate, zinc phosphate, calcium ion-exchanged silica, colloidal silica, synthetic amorphous silica, and molybdates, such as calcium molybdate, zinc molybdate, barium molybdate, strontium molybdate, or a mixture thereof.

15. The coating composition of claim 1, further comprising an alkoxysilane and a phenolic resin.

16. A multi-component composite coating comprising at least one coating layer deposited from the coating composition of claim 1.

17. A metal substrate at least partially coated with the coating composition of claim 1.

23. A method for enhancing the corrosion resistance of a metal substrate, comprising coating at least a portion of the substrate with the coating composition of claim 1.

24. A method of replacing a conventional chrome-containing corrosion-resistant composition, comprising providing the composition of claim 1.

18. A coating composition comprising:

(a) an adhesion promoting component, and

(b) corrosion resisting particles having an average primary particle size of no more than 100 nanometers and comprising a plurality of inorganic oxides.

19. The coating composition of claim 18, wherein at least one inorganic oxide comprises zinc, cerium, yttrium, magnesium, molybdenum, lithium, aluminum, or calcium.

20. A coating composition comprising:

(1) a film-forming resin, and

(2) corrosion resisting particles having a calculated equivalent spherical diameter of no more than 200 nanometers and comprising an inorganic oxide,

wherein the corrosion resisting particles are present in the composition in an amount sufficient to result in a composition that, when deposited onto at least a portion of one metal substrate selected from cold rolled steel, electrogalvanized steel and aluminum and cured, provides a substrate that exhibits corrosion resistance properties greater than the corrosion resistance properties the same substrate exhibits when at least partially coated under the same conditions with a similar coating composition that does not include the corrosion resisting particles.

21. A coating composition that is substantially free of chromium containing material, wherein the coating composition comprises:

(1) a film-forming resin, and

(2) corrosion resisting particles having a calculated equivalent spherical diameter of no more than 200 nanometers and comprising an inorganic oxide,

wherein the corrosion resisting particles are present in the composition in an amount sufficient to result in a composition that, when deposited onto at least a portion of one metal substrate selected from cold rolled steel, electrogalvanized steel and aluminum and cured, provides a substrate that exhibits corrosion resistance properties at least similar to the corrosion resistance properties that the same substrate exhibits when at least partially coated under the same conditions with a conventional chrome-containing corrosion-resistant composition.

22. A coating composition comprising:

(1) a film-forming resin, and

(2) corrosion resisting particles selected from (i) particles comprising oxides of cerium, zinc, and silicon;

(ii) particles comprising oxides of calcium, zinc and silicon;

(iii) particles comprising oxides of phosphorous, zinc and silicon;

(iv) particles comprising oxides of yttrium, zinc, and silicon;

(v) particles comprising oxides of molybdenum, zinc, and silicon;

(vi) particles comprising oxides of boron, zinc, and silicon;

(vii) particles comprising oxides of cerium, aluminum, and silicon, (viii) particles comprising oxides of cerium, boron, and silicon, or a mixture thereof.

25. A method for producing ultrafine solid particles, comprising:

(a) introducing a solid precursor into a plasma chamber;

(b) heating the precursor by means of a plasma as the precursor flows through the reaction chamber, yielding a gaseous product stream;

(c) contacting the gaseous product stream with a plurality of quench streams injected into the reaction chamber through a plurality of quench gas injection ports, wherein the quench streams are injected at flow rates and injection angles that result in the impingement of the quench streams with each other within the gaseous product stream, thereby producing ultrafine solid particles; and

(d) passing the ultrafine solid particles through a converging member.

26. An apparatus for producing ultrafine solid particles, comprising:

(a) a plasma chamber having axially spaced inlet and outlet ends;

(b) a plasma positioned at the inlet end of the plasma chamber;

(c) a solid precursor inlet for introducing a solid precursor to the plasma chamber where the precursor is heated by the plasma to produce a gaseous product stream flowing toward the outlet end of the plasma chamber;

(d) a converging member located coaxially within the outlet end of the reactor chamber; and

(e) a plurality of quench gas injection ports located upstream of the converging member, through which a plurality of quench streams are injected into the reaction chamber at flow rates and injection angles that result in the impingement of the quench gas streams with each other at or near the center of the gaseous product stream, thereby Hproducing ultrafine solid particles.