Correlative studies on the properties of rubber seed and soybean oil-based alkyd resins and their blends
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Correlative studies on the properties of rubber seed and soybean oil-based alkyd resins and their blends Ikhazuagbe H. Ifijen, Hamilton D. Odi, Muniratu Maliki, Stanley O. Omorogbe, Aireguamen I. Aigbodion, Esther U. Ikhuoria
Ó American Coatings Association 2020 Abstract This study aims at synthesizing alkyd resins from rubber seed oil (RSO), soybean oil (SBO), and their blends via the monoglyceride route. Oil extracted from rubber seeds was blended with soybean oil at various blending ratios (80:20, 70:30, 50:50, 30:70, and 10:90). Thereafter, the blends were employed in the synthesis of polyesters (alkyd resins) via alcoholysis technique. The alkyd samples synthesized from the RSO, SBO, and their respective blends were characterized for comparative purpose. The RSO-/SBObased alkyds and aforementioned blends have iodine values of 157.90/142.00, 152.44, 149.90, 143.16, 142.26, and 142.41 gI2/100 g and saponification values of 216.21/228.61, 203.67, 171.04, 161.97, 142.89, and 135.62 mgKOH/g, respectively. The drying property (set-to-touch time and the tack free) of the 100% RSObased alkyd resin did not experience any significant improvement as the blending proportion of SBO in RSO increases. The tack-free and dry-through times for the blends were estimated to be around 129–133 and 236–243 min, respectively. Huggins and Kraemer viscosity relationship was used to extrapolate the intrinsic viscosities of the RSO- and SBO-based alkyds and their corresponding blends. The blends showed resistance to brine, water, and acid. However, only some exhibited fair resistance to alkali. The results from the investigation revealed that the alkyds preI. H. Ifijen, S. O. Omorogbe, A. I. Aigbodion Department of Research Operations, Rubber Research Institute of Nigeria, Iyanomo, Benin City, Nigeria H. D. Odi, E. U. Ikhuoria (&) Department of Chemistry, University of Benin, P.M.B. 1154, Benin City, Nigeria e-mail: [email protected] M. Maliki Department of Chemistry, Edo University Iyamho, Iyamho, Edo State, Nigeria
pared using a blend of RSO/SBO oil possess coating properties whose values are comparable to those of commercial polyesters. However, the studied SBO cannot be considered as good blending oil with RSO for the preparation of alkyd for the improvement of drying properties. Keywords Rubber seed oil, Soybean oil, Alkyd resin, Blends, Polyesters
Introduction Paints may be defined as a colloidal blend of chemical constituents which form a dense, consistent, and adherent layer when dispersed on a thin layer surface. They can be utilized for decorative purposes and for preventing surfaces from being affected by diverse environmental factors such as mechanical stresses and UV-radiation. Paints are majorly composed of pigment, additives, solvent, and binder (film forming component of paint). Among the several types of resins that have been used in paint production, alkyd resin is still regarded as one of the best because of its low cost of production and the development of fewer layer faults on surfaces when compared with
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