EFFECT OF STRUCTURE ON COATING PERFORMANCE PROPERTIES OF NOVEL ALKYLENEDIOXYDIPHENOL BASED EPOXY-RESINS

Although epoxy resins exhibit a wide range of useful properties for protective coatings on metal substrates, an increasing trend in the coatings industry toward more formable coatings places a severe burden on the traditional bisphenol A based epoxy resins. Presented in this work are the results of experiments with a new series of epoxy resins based on alkylenedioxy diphenols demonstrating the relationship between coating performance properties (formability, chemical resistance, and adhesion) and structural parameters such as resin backbone flexibility, degree of phenol/formaldehyde crosslinking, and concentration of OH groups in the backbone of epoxy resins. Optimizing the three structural parameters for the new resins results in substantial improvements in coating performance properties over the traditional bisphenol A based resins.