Composition and Method for Corrosion Protection of a Structure

• US 20110143145A1
• Filed: 02/06/2011
• Published: 06/16/2011
• Est. Priority Date: 04/17/2008
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Soden, Douglas G., Byrd, Norman R.
• Granted Patent: US 8,367,791 B2
• Time in Patent Office: Days
• US Class Current: 428/429
• CPC Class Codes: C08G 18/3237 aromatic C08G18/3234 takes precedence
• CPC Class Codes: C08G 18/61 Polysiloxanes
• CPC Class Codes: C08G 2150/90 Compositions for anticorrosive coatings
• CPC Class Codes: C09D 175/02 Polyureas
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A method and composition for corrosion protection of a structure is provided. In one disclosed embodiment, a polysiloxane ureide which inhibits corrosion formation on a surface of a physical object is provided. The polysiloxane ureide has a backbone including, (i) at least one diamine-terminated polysiloxane as disclosed; (ii) at least one aromatic diamine; and, (iii) at least one diisocyanate. In another disclosed embodiment, there is provided a polyureide which inhibits corrosion formation on a surface of a physical object. The polyureide comprises: (i) at least one aliphatic diamine; (ii) at least one aromatic diamine; and, (iii) at least one diisocyanate.

Claims

1. A polysiloxane ureide which inhibits corrosion formation on a surface of a physical object, the polysiloxane ureide comprising a backbone comprising the following:

(1) at least one diamine-terminated polysiloxane of the general formula;

2. The polysiloxane ureide according to claim 1, wherein the polysiloxane ureide is terminated by at least one substituted aryl, alky, or hetero-silane, wherein the substitution comprises an amino, hydroxyl, or mercaptal group.

3. The polysiloxane ureide according to claim 1, wherein the at least one aromatic diamine is selected from the group consisting of 2,5-diaminobenzotrifluoride, 2,2′

-Bis (trifluoromethyl)benzidine, 3,3′

-Bis(trifluoromethyl)benzidine, 4,4′

-methylene dianiline, 2,2-Bis[4(4-aminophenoxy)phenyl]hexafluoropropane, 2,2-Bis[4 (4-aminophenoxy)phenyl]propane, 4,4′

-oxydianiline, 4,4′

-diaminodiphenyl sulfide, 4,4′

-diaminophenylsulfone, 1,4-Bis(4-aminophenoxy)benzene, 4,4′

-Bis(4-aminophenoxy)-biphenyl, 1,3-Bis(4-aminophenoxy)benzene, 1,3-Bis(3-aminophenoxy)benzene, o-tolidine sulfone, 3,3′

-5,5′

-tetramethylbenzidine, 2,7-Diamino fluorene, 2,4-Diamino-6-(3,5-difluorophenyl)-1,3,5-triazine, 1,3-Bis(4-aminophenoxy)propane, 2,4-Diamino-6-phenyl-1,3,5-triazine, 2,4-Diamino-6 [3-(trifluoromethyl)phenyl]-1,3,5-triazine, 2,6-diamine pyridine, and combinations thereof.

4. The polysiloxane ureide according to claim 1, wherein the at least one diisocyanate is selected from the group consisting of 1,4-phenylene diisocyanate, 4,4′

-diphenylmethane diisocyanate, cyclohexane-1,4-diisocyanate, butane-1,4-diisocyanate, hexamethylene-1,6-diisocyanate, 1,5-naphthalene diisocyanate, dicyclohexyl-methane-4,4′

-diisocyanate, cyclohexylene-1,4-diisocyanate, isophorone diisocyanate, toluene 2,4-diisocyanate, toluene 2,6-diisocyanate, 2,4′

-diphenylmethane diisocyanate, 2,2′

-diphenylmethane diisocyanate, 4,4′

-diisocyanate-diphenylethane-(1,2), and combinations thereof.

5. The polysiloxane ureide according to claim 1, wherein the polysiloxane ureide comprises a polymer according to the general formula:

-(m/n/p)-(x/y)-

wherein, m, n, p, x, y are mole fractions; and

,

“

m”

is polysiloxane diamine;

“

n”

is an aromatic diamine;

“

p”

is any diamine different from “

m” and

“

n”

;

“

x”

is a diisocyanate;

“

y”

is a diisocyanate, but different from “

x”

;

“

m”

, “

n” and

“

p”

each have a value from 0 to 1, such that m+n+p=1; and

“

x” and

“

y”

each have a value from 0 to 1, such that x+y=1.

7. A coating which inhibits corrosion formation on a surface of a physical object, the coating comprising a polysiloxane ureide according to claim 1.

8. A coating which inhibits corrosion formation on a surface of a physical object, the coating comprising a polysiloxane ureide according to claim 2.

9. A coating which inhibits corrosion formation on a surface of a physical object, the coating comprising a polysiloxane ureide according to claim 3.

10. A coating which inhibits corrosion formation on a surface of a physical object, the coating comprising a polysiloxane ureide according to claim 4.

12. A substrate resistant to corrosion formation, comprising a substrate having an external surface and a corrosion resistant polymer coating on at least a portion of the external surface, wherein the polymer coating is formed from a polysiloxane ureide according to claim 1.

13. The substrate according to claim 12, wherein the substrate is selected from the group consisting of metal, carbon composites, wood, plastics, resin matrices containing graphite, carbon, glass fibers, transparencies, painted and unpainted substrates, and combinations thereof.

6. A random polysiloxane ureide polymer comprising the reaction product of the following:

(i) at least one diamine-terminated polysiloxane of the general formula;

11. A method of producing a polysiloxane ureide comprising:

reacting at least one diamine-terminated polysiloxane, at least one aromatic diamine, at least one diisocyanate, and at least one amine functional trialkoxy-silane.