Polyurethane Surfaces Coating Based on Alkyd-(Castor Oil-Epoxy resin Reaction Product) Blends

摘要

Castor oil (CO) was reacted with commercial epoxy resin (ER) (Diglycidylether of Bisphenol-A i.e. DGEBA) at various mole ratios. Resultant condensate products of castor oil-epoxy resin was designated as COERs and characterized by physical, chemical and IR spectral study. Commercially available alkyd resin was blended with various proportions of castor oil-epoxy resin condensate products (alkyd-COERs blends) using different isocyanates namely toluene diisocyanate (TDI) and hexamethylene diisocyanate (HMDI). All blends were applied on mild steel panels and characterized for surface drying time, tack-free time, adhesion, flexibility, scratch hardness, pencil hardness, impact resistance and chemical resistance properties.