STUDIES IN THE SYNTHESIS OF OIL MODIFIED ALKYD RESIN USING CRUDE SOYBEAN OIL AS MODIFIER

Two categories of alkyd resins, the short and medium oil alkyd resins, were prepared by alcoholysis method using crude soybean oil as alkyd modifier. Progress of the reaction was monitored by determining change s in acid value of the whole reaction mixture with time. Results showe d that acid value decreased with increase in reactor time for both cat egories. Rate of decrease was more rapid for early stages of the synth esis and the decrease was more rapid for medium oil alkyd than for sho rt oil alkyd. Alkyd yield of the two categories of resin was estimated from the calculated rate constant. Medium oil alkyd has higher yield with rate constant of k=3.21g (mole COOH)(-1 min) compared to that of short oil alkyd with rate constant of k = 2.22g (mole COOH)(-1). Gelat ion period was 60 min and 90 min for medium oil alkyd and short oil al kyd respectively.