Synthesis And Characterization of Hura crepitans Seed Oil Alkyd Resin For Surface Coating Formulation

Abstract

The study aimed at synthesizing and characterizing alkyd resin from Hura crepitans seed oil as a surface coating material. H. crepitans seed oil was extracted from its oil-bearing seeds via Soxhlet extraction with n-hexane. The alkyd resin synthesis involved reaction of 50 % oil length triglycerides by alcoholysis process to obtain H. crepitans seed oil monoglycerides at 230°C, followed by modification with phthalic anhydride via polyesterification process at 220°C. Fourier Transform Infra-Red (FT-IR) was used to confirm the ester linkage present in the alkyd resin and compared with the H. crepitans seed oil. The physicochemical properties of H. crepitans seed oil determined for its suitability as a potential material were: acid, peroxide, iodine, saponification values and % free fatty acid with respective values of 9.66 mgKOH/g, 2.84 mgEq/kg, 160.73 gI2/100g, 205.00 mgKOH/g and 2.24 %. The acid, iodine and saponification values of the synthesized alkyd resin were 6.65 mgKOH/g, 82.40 gI2/100g and 308.00 mgKOH/g respectively. The chemical resistance of the synthesized alkyd resin showed that the film formed from the polyester has a good resistance to chemicals except that it is susceptible to alkaline hydrolysis, indicating its poor resistance to alkali solution. The result of the drying properties obtained revealed that the polyester gotten from H. crepitans seed oil have a high drying speed in the presence of drying agent and exhibit excellent adhesion which indicates better protection of substrates. Hence, H. crepitans seed oil alkyd resin shows promising ability as a binder in surface coatings formulation.