Primer adhesive for laminated condensing heat exchangers

摘要

A method of forming composite polymeric coatings on a metal surface of a condensing heat exchanger substrate which includes providing an acidic starting solution which has at least one chemically distinct monomer and at least one solvent and where the monomer is polymerizable upon contact with the metal substrate. The monomer solution is applied to the substrate which will initiate spontaneous polymerization of the monomer on the surface of the metal substrate in the absence of any other catalyst or catalysts. The solution contacts the metal substrate for a time sufficient to form a polymeric coating on the substrate. The monomer further contains latent polymerization sites that do not react during spontaneous polymerization and are available as reaction sites for bonding with a later applied overcoating. A second protective polymeric overcoat is applied to said first polymer coating whereby the latent polymerization sites react with said polymeric overcoat to enhance bonding and adhesion between the two coatings.