Synthesis and Characterization of Polyesteramide Resin from Rubber Seed Oil for Surface Coating Application (original) (raw)

Abstract The polyesteramide resin was synthesized from adipic acid, N,N-bis-(2-hydroxyethyl) and Hevea brasiliensis. Fatty amide was obtained from methyl ester of the rubber seed oil by treatment with diethanol amine. The synthesized intermediates and resin were characterized in terms of acid value, iodine value, saponification value, drying time and specific gravity. The coating performance of the resins was tested by measurement of pencil hardness, adhesion and chemical resistance. The polyesteramide resin has lower saponification value than the oil. The lower iodine value of the polyesteramide resin is obviously due to the reduction of the molecular mass of the oil which accommodates the unsaturation present in the fatty acids of the oil. The resin has a short set to touch time but a considerably long dry through time of 5 hours, the oil is probably a semi drying oil rather than a none drying or drying oil.