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

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 towards the performance of coating on its 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). Then, the results were evaluated based on ASTM610. Three different solution were used in the chemical immersion test, firstly, in Sulphuric Acid solution, where formulation 30:70 and 20:80 were the fastest to peeled off from surface compared to 0:100 and 10:90 formulation. While in Sodium Chloride solution, at the 5th day of immersion there were rust spots at the edges for all metal coupons. Lastly, immersion in Sodium Hydroxide solution where all of the coating formulation of 10:90, 20:80 and 30:70 were totally peeled off from the surface. However, the coating formulation of 0:100 still adhere to the metal. After 15 days of immersion, the degree of rusting was evaluated, where the degree of the coupons immersed in H₂SO₄ were all 0 since the coating totally detached off from surface. In NaCl coating of 0:100 ratio give a better degree of rusting compared to formlation ratio 10:90, which is 6s for 0:100 and 4sfor 10:90 ratio. For solvent rub test the highest thickness loss from formulation of 30:70 was obtained at 20% and 9% for Methyl ethyl ketone and acetone respectively. The best formulation out of all formulation is 0:100 which do not contain EPO. This result shows coating has fail to protect the metal from corrosion due to non existence of epoxy ring detected on FTIR analysis in the Epoxidized Palm Oil. Thus, the method of epoxidation needs to be improvised for future enhancement.