Studies on melamine modified polyesteramide as anticorrosive coatings from linseed oil: A sustainable resource

Melamine modified polyester amide (MPEA) was synthesized by the reaction of linseed oil fatty amide. The resin was further cured at room temperature by polystyrene comaleic anhydride (SMA) in different phr ( 30 - 80) to obtain MPEA coatings. The probable structure of MPEA was confirmed by FT-IR, H-1-NMR and C-13-NMR spectroscopic techniques. The physico-chemical characterization of these resins viz. iodine value, saponification value, refractive index, inherent viscosity were carried out by standard methods. MPEA ( 40 wt%) solution in ethylene glycol monomethyl ether (EGME) was applied on a mild steel strip of standard sizes to study their physicomechanical and chemical resistance properties. It was found that coatings of MPEA with 60 parts per hundred of the resin ( phr) of SMA showed the best performance in physico-mechanical and alkali resistance properties. Thermal stability and curing behavior were studied by Thermo Gravimetric Analyses (TGA) and Differential Scanning Calorimetry (DSC), respectively.