Development of epoxidized palm oil coating from waste cooking oil towards chemical resistance: article

Epoxidation from plant oil recently received a big attention as an alternative to replace Bisphenol A in the formulation of a more eco-friendly epoxy coating. At the same time, there were reports on the increasing waste of cooking oil. Therefore, this study was conducted in order to develop a new coating material from used cooking oil and to test its performance towards chemical resistance. Three formulation of coating with different ratio of Epoxidized palm oil to Diglycidylether Bisphenol A (10:90, 20:80 and 30:70). Then, the coating was tested its performance on chemical resistance by referring to ASTM standards (ASTM G20, ASTM 5402). The results were evaluated based on ASTM610 which from 0 to 10 degree of rusting lead to better performance of coating. Sulphuric Acid, Sodium Chloride and Sodium hydroxide solution were used in the chemical immersion test. After 15 days of immersion in H2SO4, the degree of rusting was evaluated, and all of the coupons were marked 0 since the coating were totally detached off from surface. In NaCl, the coating for all formulation ratio were still attached to the metal coupon but there were rusting spots observed due to edge effect. The formulation ratio of 0:100 and 20:80 have a better degree of rusting which was 6s while the degree of rusting for 10:90 and 30:70 formulation ratio was 4s and 5s accordingly. For solvent rub test, the highest thickness loss from formulation of 30:70 was obtained at 20% and 9% for Methyl ethyl ketone (MEK) and acetone respectively. While the lowest thickness loss from formulation 0:100 was 2% for MEK and 1% for acetone.