COATING COMPOSITION

• US 20120288700A1
• Filed: 11/10/2010
• Published: 11/15/2012
• Est. Priority Date: 11/11/2009
• Status: Abandoned Application

• Current Assignee: BYK-Chemie GmbH (Susanne Klatten, MBA)
• Original Assignee: BYK-Chemie GmbH (Susanne Klatten, MBA)
• Inventors: McMullin, Robert, Lewchik, Fred, Lester, Terry
• Application Number:
  US13/508,771
• Publication Number:
  US 20120288700A1
• Time in Patent Office: Days
• US Class Current: 428/220
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/24 Acids; Salts thereof C08K3/16 takes precedence
• CPC Class Codes: C08K 9/06 with silicon-containing compounds
• CPC Class Codes: C09C 1/043 Zinc oxide
• CPC Class Codes: C09C 1/3081 Treatment with organo-silicon compounds
• CPC Class Codes: C09C 1/407 Aluminium oxides or hydroxides
• CPC Class Codes: C09D 5/082 characterised by the anti-corrosive pigment
• CPC Class Codes: C09D 7/60 non-macromolecular C09D7/41-C09D7/48 take precedence
• 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 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/259 Silicic material

Abstract

A coating for a substrate is a cured coating composition which includes binder and particles, wherein the particles are inorganic, organic or organo-metallic; have diameters between about 1 and 500 nm; may be treated with a surface modifer; and wherein the cured coating composition is in direct or indirect contact with the substrate.

Claims

1. A coating for a substrate for increasing the corrosion resistance of the substrate, the coating comprising a cured coating composition which cured coating composition comprises:

i) 5 to 99 weight % binder (A) and

ii) 0.2 to 4.5 weight % nanoparticles (B),

wherein the nanoparticles (B) comprise at least one of ZnO, CeO₂, Al₂O₃, SiO₂, Al(O)OH, TiO₂, ZrO₂, oxide hydroxides, hydroxides, phosphates, molvbdates, tungstates, vanadates, silicates, chromates, nitrites, sulfates, conductive polymers, or combinations thereof;

the nanoparticles (B) have diameters greater than 5 nm and below 200 nm;

the surface of the nanoparticles (B) is treated with at least one surface modifying group, wherein the surface of the nanoparticles (B) is modified by;

(1) polvdialkylsiloxanes;

(2) polar polvdialkylsiloxanes;

(3) polymeric modifiers;

(4) organosilanes;

(5) wetting and/or dispersing additives;

or

(6) mixtures of one or more of the aforementioned substances (1) through (5);

wherein the substrate is metallic; and

,

wherein the cured coating composition is adapted to be in direct or indirect contact with the substrate.

2. The coating according to claim 1, wherein the cured coating composition has a modulus of elasticity that is decreased by 10% in comparison to a non particle containing coating material.

3. The coating according to claim 1, wherein the cured coating composition is transparent.

5. The coating according to claim 1, wherein the binder (A) comprises a crosslinkable or non-crosslinkable resin.

6. The coating according to claim 1, wherein the nanoparticles (B) comprise at least one of ZnO, CeO₂, Al₂O₃. SiO₂, Al(O)OH, TiO₂, ZrO₂, oxide hydroxides, hydroxides, phosphates, molybdates, tungstates, vanadates, silicates, chromates, nitrites or sulfates.

7. The coating according to claim 1, wherein the diameter of the nanoparticles (B) is below 100 and greater than 10 nm.

9. The coating according to claim 1, wherein the surface of the nanoparticles (B) is modified by the surface modifying group attaching to the surface of the nanoparticles via at least one chemical or non chemical bond, a covalent, non covalent, or physical bond.

10. The coating according to claim 1, wherein the coating contains a surface active agent (C) not being a modifier of the particles (B).

11. The coating according to claim 1, wherein the metallic substrate comprises a metal, metal mixture, metal composite or metal alloys that may experience any means of corrosion.

12. The coating according to claim 1, wherein cured coating composition contains has a depth between 15 and 900 μ

m.

13. The coating according to claim 1, wherein between the cured coating composition and the substrate are embedded one or more further coating layers which contain pigments and/or fillers.

14. The coating according to claim 1, wherein the cured coating composition is directly bound to the metallic substrate or alternatively a cathodic protection coating of 5 to 30 μ

m in depth is directly embedded between the metallic substrate and the cured coating composition.

16. The coating according to claim 5, wherein the resin comprises at least one of the classes of acrylics, aminoplasts, urethanes, carbamates, carbonates, polyesters, epoxies, silicones or polyamides.

17. The coating according to claim 16, wherein the resin comprises functional groups characteristic of more than one said class.

18. The coating according to claim 5, wherein the binder (A) comprises at least one of one component polyurethanes, two component polyurethanes. acrylics, oil modified urethanes, long oil alkyds, polyurethane dispersions, acrylic emulsions, epoxies, or water reducible alkyds.

19. The coating according to claim 9, wherein the modifying group comprises a spacer component which is unable to undergo reactions with the nanoparticle surface and is inert towards the coating.

20. The coating according to claim 11, wherein the metallic substrate comprises at least one of iron, steel, aluminum, dye-cast-aluminum, dye-cast-alloys, or magnesium-aluminum-alloys.

21. The coating according to claim 1, wherein cured coating composition has a depth between 15 and 30 μ

m.

22. The coating according to claim 1, wherein the diameter of the nanoparticles (B) is below 60 nm and greater than 20 nm.

23. A method of increasing the corrosion resistance of a metallic substrate, the method comprising applying a coating according to claim 1 on the substrate.

25. A metallic substrate, wherein the substrate is provided with an increased corrosion resistance, on which substrate a coating according to claim 1 has been applied.

4. (canceled)

8. (canceled)

15. (canceled)

24. A method of increasing the corrosion resistance of a metallic substrate, the method comprising applying a coating on the substrate followed by curing the applied coating, wherein the cured coating coating composition comprises:

i) 5 to 99 weight % binder (A) and

ii) 0.2 to 4.5 weight % nanoparticles (B),

wherein;

the nanoparticles (B) comprise at least one of ZnO, CeO₂, Al₂O₃, SiO₂, Al(O)OH, TiO2, ZrO2, oxide hydroxides, hydroxides, phosphates, molybdates, tungstates, vanadates, silicates, chromates, nitrites, sulfates, conductive polymers or combinations thereof;

the nanoparticles (B) have diameters greater than 5 nm and below 200 nm;

the surface of the nanoparticles (B) is treated with at least one surface modifying group, wherein the surface of the nanoparticles (B) is modified by;

(1) polydialkylsiloxanes;

(2) polar polydialkylsiloxanes;

(3) polymeric modifiers;

(4) organosilanes;

(5) wetting and/or dispersing additives;

or

(6) mixtures of one or more of the aforementioned substances (1) through (5);

wherein the substrate is metallic; and

,

wherein the cured coating composition is adapted to be in direct or indirect contact with the substrate.

26. A metallic substrate, wherein the substrate is provided with an increased corrosion resistance, on which substrate a coating has been applied and subsequently cured, wherein the cured coating coating composition comprises:

i) 5 to 99 weight % binder (A) and

ii) 0.2 to 4.5 weight % nanoparticles (B),

wherein;

the nanoparticles (B) comprise at least one of ZnO, CeO₂, AlO₃, SiO₂, Al(O)OH, TiO₂, ZrO₂, oxide hydroxides, hydroxides, phosphates, molybdates, tungstates, vanadates, silicates, chromates, nitrites, sulfates, conductive polymers or combinations thereof;

the nanoparticles (B) have diameters greater than 5 nm and below 200 nm;

the surface of the nanoparticles (B) is treated with at least one surface modifying group, wherein the surface of the nanoparticles (B) is modified by;

(1) polydialkylsiloxanes;

(2) polar polydialkylsiloxanes;

(3) polymeric modifiers;

(4) organosilanes;

(5) wetting and/or dispersing additives;

or

(6) mixtures of one or more of the aforementioned substances (1) through (5);

wherein the substrate is metallic; and

,

wherein the cured coating composition is adapted to be in direct or indirect contact with the substrate.