More Flexible Epoxy Coatings with Promoted Adhesion Using Castor Oil-TETA Derivative Amidoamines

In this study two series of castor oil-triethylenetetramine (TETA) derivative polyamidoamines were synthesized using castor oil, TETA, salicylic acid and dimethyl formamide (DMF) at room temperature. The prepared polyamidoamines were used for the curing of epoxy resins. It was found from the mechanical properties, as well as adhesion and water resistance that these polyamidoamine cured coatings, in addition to suitable flexibility, had higher adhesion to substrates compared to polyamine cured samples. The results showed a great enhancement in flexibility and adhesion properties of the epoxy coatings due to increasing castor oil weight ratio, and/ or using salicylic acid and DMF. Furthermore, polyamidoamines cured samples showed higher water resistance and better protection capability in hot water immersion tests than polyamine cured sample, despite the fact that their water absorption was higher. J. Color Sci. Tech. 6(2012), 87-94© Institute for Color Science and Technology.