Preparation and characterization of polyester amide resin derived from Nigerian soya bean oil and its performance evaluation as binder for surface coatings

Polymeric systems based on polyesteramides (PEA) are high performance materials, which combine the useful properties of polyester and polyamide resins. In this work, a new modified polyesteramide resin was prepared and evaluated as binder for surface coating.The resin was synthesised by the reaction of N,N-bis-(2-hydroxyethyl) soya bean oil fatty acid amide (HESFAA) as a source of the polyol and as preservative against microbiological attack, with phthalic anhydride as the ingredient source of the polybasic acid. The measured acid value of the resin was found to be 7 mg KOH/g, which indicates the complete formation of the resin. The structure of the resin was confirmed by FT-IR spectral studies. The results show that the modification enhances both phyisco-mechanical and chemical properties of the PEA. From the analyses carried out, the synthesized resin could be suitable as binder for different types of paint. Keywords: Binder, Phthalic anhydride, Polyester amide, Soya bean oil fatty acid