Comparative Studies of Oil-Modified Alkyd Resins Synthesized from Epoxidized and Crude Neem Oil

Two different alkyd resins; epoxidized neem seed oil-modified alkyd resin (ENOMAR) and crude neem seed oil-modified alkyd resin (CNOMAR) with oil-length of 64.5% each were synthesized. A portion of neem oil was epoxidized at 50°C using per-acid generated in-situ. The (ENOMAR) and (CNOMAR) were prepared using glycolysis and poly-condensation methods. Methyl ethyl ketone peroxide (MEKP) and cobalt naphthalate in toluene were employed as the driers. The physicochemical analyses of the synthesized resins were investigated. Also, minimum drying and set to touch time was recorded at 15hrs, 9hrs and 17hrs, 10hrs for (ENOMAR) and (CMOMAR) respectively at temperature of 120°C on exposed for 120min. Both resins show good resistance in 10% HCl and distilled water. (CNOMAR) shows relatively fair resistance in 1%NaCl while (ENOMAR) has a poor resistance in the brine solution. FT-IR results shows a broad and sharp peaks at 1732cm -1 , 2928cm -1 and 3465cm -1 for (ENOMAR) and two broad peaks at 1734cm -1 , and 2927cm -1 for (CNOMAR). Statistical analysis from ANOVA table comparing the drying time between the two resins gave F v =0. 327 and F c = 5. 990. Assessments of the properties show that epoxidized neem oil modified alkyd resin (ENOMAR) has better film properties compared to crude neem oil modified alkyd resin (CNOMAR).