Properties and toughening mechanism of epoxy varnish coating prepared with amine curing agent modified by tridecafluorooctyl methacrylate
[Introduction]The hydrogenated bisphenol A diglycidyl ether epoxy resin (HBPA-EP) based coatings exhibit issues such as high brittleness,insufficient toughness,and poor hydrophobicity during their applications,which urgently need to be addressed.[Method]The isophorone diamine (IPDA) curing agent was modified by trideca-fluorooctyl methacrylate (C6F) and then reacted with HBPA-EP to form a coating. The effect of the dosage of modifier on hydrophobicity,mechanical properties,chemical resistance,and stain resistance of the coating was studied. The modification mechanism of C6F on IPDA was analyzed by Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy. The fracture morphology and surface fluorine distribution of the coating were characterized by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS).[Result]The fluorocarbon chain structure of C6F was successfully introduced into the IPDA molecule. The coatings cured with C6F-modified IPDA showed significant improvements in both hydrophobicity and mechanical properties.
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