Isolation and Characterization of Castor Seed Oil and Its Utilization Potential in the Production of Polyurethane Foam

Aishat IMASUEN, Festus INEGBEDION, Christopher ERHABOR, Michae OSUIDE


Firm polyurethane (PU) foams were prepared using Nigerian grown brown and white castor seed oil starting materials extracted at ambient temperature. Polyol with terminal primary hydroxyl groups synthesized from crude castor oil were reacted with aromatic diphenylmethane diisocyanate to prepare the foams. Castor seeds were decorticated and milled, after which they were weighed into filter bags for expression at ambient temperature, 50, 100 and 150°C respectively at a constant pressure of 2 ton. Evaluation of the oil yield shows that the brown seeds with lower weight at a temperature of 150°C gave a high yield of 54.79 %, compared to high weight at ambient temperature, which yielded 29.45 %. The white seeds with lower weight at a temperature of 150°C gave high yields of 52.75 %, compared to higher weight at ambient temperature yielding 30.06 %. The oil was characterized in terms of moisture content, volatile content, acid value, free fatty acid and saponification value. The results are within the range reported in literature. In-situ polymerization was used in the production of polyurethane foam using the extracted oil as polyol. The results of the foam characterization in terms of compression set and density conform to standard foams.



Castor seeds, polyurethane foam, oil

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