Process for bonding reactive adhesives to substrates
View Patent ↗The invention is a system, or kit, comprising i) a stable solution or dispersion of a catalyst for the curing of a reactive adhesive system; and in a separate part ii) an uncured reactive adhesive system wherein the catalyst of part i) accelerates the cure of the reactive adhesive system. The reactive adhesive system can be a one or two-part system. In another embodiment, the invention is a method of bonding a reactive adhesive to a substrate comprising: a) contacting a catalyst for the curing of the reactive adhesive in a volatile solvent with the surface of the substrate to which the adhesive will be bonded; b) allowing the volatile solvent to volatilize away; c) contacting a reactive adhesive with the surface treated in step a) and d) allowing the adhesive to cure. This process is performed in the absence of a primer and a film forming agent.
1. A method of bonding a reactive adhesive to at least one substrate comprising:
a) contacting a tertiary amine catalyst for a curing of a polyisocyanate based adhesive system in a volatile hydrocarbon solvent or dispersant with the surface of the substrate comprising a coated metal to which the polyisocyanate based adhesive system will be bonded;
b) allowing the volatile hydrocarbon solvent or dispersant to volatilize away;
c) contacting a reactive polyisocyanate based adhesive system with the surface treated in step a); and
d) allowing the polyisocyanate based adhesive system to cure.
2. A method according to claim 1 wherein the first substrate is bonded to a second substrate with the adhesive disposed between the two substrates before the reactive adhesive is cured.
3. A method according to claim 1 wherein the second substrate is treated with the catalyst in a volatile solvent or dispersant on the portion of the surface to be contacted with the reactive adhesive.
4. A method according to claim 1 wherein the adhesive is a one-part or two-part polyisocyanate based adhesive system.
5. A method according to claim 1 , wherein the volatile solvent is one or more of an aliphatic hydrocarbon, cycloaliphatic hydrocarbon, or aromatic hydrocarbon.
6. A method according to claim 5 wherein the concentration of catalyst in volatile solvent or dispersant is from about 0.01 to about 20 percent by weight.
7. A method according to claim 1 wherein after step b) only catalyst is located on the surface of the substrate to which the adhesive is to be bonded.
8. A method according to claim 1 wherein the catalyst solution further comprises a marker.
9. A method according to claim 8 wherein after step b) only catalyst and marker are located on the surface of the substrate to which the adhesive is to be bonded.
10. A method according to claim 1 wherein the catalyst solution does not contain a film forming resin.
11. A method according to claim 1 wherein the substrate comprises e-coated metal.
12. A method according to claim 11 wherein the e-coated metal is aluminum or steel.
13. A method according, to claim 1 wherein the reactive adhesive on the substrate is heated.
14. A method according to claim 13 wherein the reactive adhesive on the substrate is heated from 60° C. to 180° C.
15. A method of bonding a reactive adhesive to at least one substrate comprising:
a) contacting a catalyst comprising tris-(dimethylaminomethyl) in a volatile hydrocarbon solvent or dispersant with the surface of the substrate to which the polyisocyanate adhesive system will be bonded;
b) allowing the volatile solvent or dispersant to volatilize away;
c) contacting it reactive polyisocyanate adhesive system with the surface treated in step a); and
d) allowing the polyisocyanate adhesive system to cure.
16. A method according to claim 15 wherein the first substrate is bonded to a second substrate with the adhesive disposed between the two substrates before the reactive adhesive is cured.
17. A method according to claim 15 wherein the second substrate is treated with the catalyst in a volatile solvent or dispersant on the portion of the surface to be contacted with the reactive adhesive.
18. A method according to claim 15 wherein the adhesive is a one-part or two-part polyisocyanate based adhesive system.
19. A method according to claim 15 wherein the volatile solvent is one or more of an aliphatic hydrocarbon, cycloaliphatic hydrocarbon, or aromatic hydrocarbon.
20. A method according to claim 19 wherein the concentration of catalyst in volatile solvent or dispersant is from about 0.01 to about 20 percent by weight.
21. A method according to claim 15 wherein after step b) only catalyst is located on the surface of the substrate to which the adhesive is to be bonded.
22. A method according to claim 15 wherein the catalyst solution further comprises a marker.
23. A method according to claim 22 wherein after step b) only catalyst and marker are located on the surface of the substrate to which the adhesive is to be bonded.
24. A method according to claim 15 wherein the catalyst solution does not contain as film forming resin.
25. A method according to claim 15 wherein the substrate comprises coated metal.
26. A method according to claim 25 wherein the substrate comprises e-coated metal.
27. A method according to claim 26 wherein the e-coated metal is aluminum or steel.
28. A method according to claim 15 wherein the reactive adhesive on the substrate is heated.
29. A method according to claim 28 wherein the reactive adhesive on the substrate is heated from 60° C. to 180° C.