Method of bonding perfluoroelastomeric materials to a surface
The invention includes a method of bonding a perfluoroelastomer material to first surface that includes: (a) contacting a first surface with a bonding agent comprising a curable perfluoropolymer and a curing agent; (b) curing the bonding agent to form a perfluoroelastomer material that is bonded to the first surface. In the practice of such method, the bonding agent may be a solution prepared by dissolving the curable perfluoroelastomer and the curing agent in a solvent. In an embodiment of the invention, the perfluoroelastomer material formed in step (b) is a coating layer or, alternatively, the first surface is a surface of a perfluoroelastomer member and the perfluoroelastomer material formed is a perfluoroelastomer weld.
1. A method of forming a perfluoroelastomer coating comprising (a) dissolving a curable perfluoropolymer, having at least one curesite monomer comprising a cyano group, and a curing agent in a solvent to form a solution, (b) applying the solution to a surface; and (c) curing the perfluoropolymer to form a cured perfluoroelastomeric coating on the surface, wherein step (c) comprises heating the coating layer for a sufficient period of time to effectively cure the perfluoropolymer, further wherein the curing agent is selected from the group consisting of a monoamidine, a monoamidoxime and an aryldioxime.
2. The method according to claim 1 , wherein the curing step further comprises heating the coating layer to about 149° C. (300° F.).
3. The method according to claim 1 , wherein step (a) further comprises (i) forming a first solution of the curable perfluoropolymer and a first solvent; (ii) forming a second solution of the curing agent and a second solvent; and (iii) combining the first solution and the second solution.
4. The method according to claim 3 , wherein the first solvent and the second solvent are identical.
5. The method according to claim 1 , wherein step (b) comprises spraying the solution onto the surface.
6. The method according to claim 1 , wherein the curing agent is perfluorooctanaidine or heptafluorobutyrlamidine.
7. The method according to claim 1 , wherein the solution comprises about 1% to about 25% by weight of the perfluoropolymer based on the total weight of the solution.
8. The method according to claim 7 , wherein the solution comprises about 1% to about 10% by weight of the perfluoropolymer based on the total weight of the solution.
9. The method according to claim 8 , wherein the solution comprises about 1% to about 5% by weight of the perfluoropolymer based on the total weight of the solution.
10. The method according to claim 9 , wherein the solution comprises about 0.01% to about 5% by weight of the curing agent, based on the total weight of the solution.
11. The method according to claim 10 , wherein the solution comprises about 0.01% to about 1.5% by weight of the curing agent based on the total weight of the solution.
12. The method according to claim 11 , wherein the solution comprises about 0.25% to about 1% by weight of the curing agent based upon total weight of the solution.