Hybridization of aqueous PU/epoxy resin via a dual self‐curing process |
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| Authors: | Wei‐Jen Chen Shih‐Chieh Wang Po‐Cheng Chen Tsorng‐Wen Chen Kan‐Nan Chen |
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| Affiliation: | Department of Chemistry, Nano‐Tech Research Center, Tamkang University, Tamsui 251, Taiwan, Republic of China |
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| Abstract: | Amino‐terminated and carboxyl‐containing polyurethane (PU) is prepared by an isocyanate‐terminated PU prepolymer process. Carboxyl‐containing epoxy resin is obtained from a half‐esterification of epoxy resin with maleic anhydride. These two aqueous resins are obtained after neutralization with triethylamine and dispersion into water phase, respectively. A latent curing agent (TMPTA‐AZ) is prepared by a Michael addition of aziridine with trimethylolpropane triacrylate (TMPTA). A self‐curing system of PU/epoxy hybrid is obtained from a blending of these two aqueous resins with latent curing agent. PU/epoxy hybrid is derived from two self‐curing reactions on drying. The first curing for hybridization between PU amino groups with oxirane groups of epoxy resin is via a ring‐opening reaction and the secondary curing takes place on carboxyl groups of PU/epoxy hybrid with aziridine of TMPTA‐AZ. The final properties of these dual self‐cured PU/epoxy hybrids are reported. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 |
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| Keywords: | aziridine dual‐curing PU epoxy resin hybrid |
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