Metal coating coupling composition
View Patent ↗A metal-coupling composition composed of silane cross-linking and coupling agents wherein the coupling agent includes a vinyl moiety. The coupling composition is a replacement for iron-phosphatizing/chromate primering and chromate primering in zinc phosphatizing processes. In a preferred embodiment, the silane cross-linking agent has the following formula: and X is a trivalent group, each Y is independently a divalent group or series of divalent groups, each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group, and —OR group(s) are hydrolysable; and the silane coupling agent has the following formula: each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group, and —OR group(s) are hydrolysable;
1. A metal coating coupling composition comprising a cross-linking agent having the formula:
and X is a trivalent group selected from the group consisting of
each Y is independently a divalent group, each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group;
a coupling agent having the formula:
and Z is independently —R, —OR, —OROR, or halogen and each R is independently a C 1-10 alkyl group or an aryl group; and
an organic solvent.
2. The metal coating coupling composition according to claim 1 wherein
Y is independently
with n being an integer from about 1 to about 10.
3. The metal coating composition according to claim 1 wherein the cross-linking agent has the formula:
4. The metal coating composition according to claim 1 wherein the coupling agent is vinyl-tris-(2-methoxyethoxy)silane.
5. The metal coating coupling composition according to claim 1 wherein the cross-linking agent and the coupling agent are present in a ratio of from 1:10 to 10:1.
6. The metal coating coupling composition according to claim 1 wherein the concentration of the silane cross-linking agent is from 0.0001 to 40%/wt.
7. The metal coating coupling composition according to claim 1 wherein the concentration of the silane coupling agent is from 0.0001 to 40%/wt.
8. The metal coating coupling composition according to claim 1 wherein the solvent is 2-methyl-2,4-pentanediol in a concentration of from 0.01 to 99.9%/wt.
9. The metal coating coupling composition according to claim 1 having a 12-month shelf life and 200° F. flash point, wherein the concentration of the silane cross-linking and silane coupling agent is from 0.1 to 40%/wt. and the concentration of solvent is from 0.1 to 99.9%/wt.
10. The metal coating coupling composition according to claim 1 further including an acidic compound in its dilute solution.
11. A dilute aqueous solution of the metal coating coupling composition of claim 1 wherein the composition of claim 1 is dissolved in acidic water with the concentration from 0.001 to 10%/wt.
12. The dilute aqueous solution of claim 11 wherein the metal coating coupling composition is present in a concentration of 0.01 to 20.0%/wt.
13. A dilute aqueous solution as defined in claim 11 further including an acidic compound.
14. The dilute aqueous solution as defined in claim 13 wherein the acidic compound may includes titanium and/or ziconium ions.
15. The dilute aqueous solution as defined in claim 11 having a pH value from 1.0 to 12.0, a working of temperature of about ambient, and a contacting time of about 30-60 seconds.
16. The metal coating coupling composition according to claim 1 reacted with a polymer.
17. A method of treating bare metal surfaces employing the metal coating coupling composition according to claim 1 .
18. The metal coupling composition according to claim 1 wherein the coupling agent is vinylmethyldimethoxysilane.
19. The metal coupling composition according to claim 1 wherein the coupling agent is vinyltrichlorosilane.
20. The metal coupling composition according to claim 1 wherein the coupling agent is vinyltriethoxysilane.
21. The metal coating coupling composition according to claim 20 wherein the solvent is present in an amount of about 90% by weight.
22. The metal coating coupling composition according to claim 1 wherein the coupling agent is vinyltrimethoxysilane.
23. The metal coupling composition according to claim 1 wherein the coupling agent is vinyltrimethoxysilane.
24. The metal coupling composition according to claim 1 wherein the organic solvent is a glycol.
25. A metal coating coupling composition comprising a cross-linking agent having the formula:
and X is a trivalent group, each Y is independently a divalent group, each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group;
a coupling agent having the formula:
and Z is independently —R, —OR, —OROR, or halogen and each R is independently a C 1-10 alkyl group or an aryl group; and
a glycol solvent.
26. The metal coating coupling composition according to claim 25 wherein X is
and Y is independently
with n being an integer from about 1 to about 10.
27. The metal coating composition according to claim 25 wherein the cross-linking agent has the formula:
28. The metal coating composition according to claim 25 wherein the coupling agent is vinyl-tris-(2-methoxyethoxy) silane.
29. The metal coating coupling composition according to claim 25 wherein the solvent is 2-methyl-2,4-pentanediol in a concentration of from 0.01 to 99.9%/wt.
30. The metal coating coupling composition according to claim 25 further including an acidic compound in its dilute solution.
31. The metal coupling composition according to claim 25 wherein the coupling agent is vinylmethyldimethoxysilane.
32. The metal coupling composition according to claim 25 wherein the coupling agent is vinyltrichlorosilane.
33. The metal coupling composition according to claim 25 wherein the coupling agent is vinyltriethoxysilane.
34. The metal coating coupling composition according to claim 25 wherein the coupling agent is vinyltriisopropoxysilane.
35. The metal coating coupling composition according to claim 25 wherein the coupling agent is vinyltrimethoxysilane.
36. A metal coating coupling composition comprising a cross-linking agent having the formula:
and X is a trivalent group, each Y is independently a divalent group, each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group;
a coupling agent having the formula:
and Z is indpendently —R, —OR, —OROR, or halogen and each R is independently a C 1-10 alkyl group or an aryl group; and
2-methyl-2,4-pentanediol.
37. The metal coating coupling composition according to claim 36 wherein X is
and Y is independently
with n being an integer from about 1 to about 10.
38. The metal coating composition accordin g to claim 36 wherein the cross-linking agent has the formula:
39. The metal coating composition according to claim 36 wherein the coupling agent is vinyl-tris-(2-methoxyethoxy) silane.
40. A metal coating coupling composition comprising a cross-linking agent having the formula:
and X is a trivalent group selected from the group consisting of
each Y is independently a divalent group, each Q is independently —R or —OR and each R is independently a C 1-10 alkyl group or aryl group;
a vinyl silane coupling agent; and
an organic solvent.