Penggunaan Faktis Minyak Biji Jarak Epoksi (Castor Jatrpha Oil) untuk Pembuatan Kompon Rubber Washer

Epoxidation is a chemical reaction where oxygen atoms are reacted with unsaturated molecules to form cyclic ether. The advantages of this process are enhancing the rubber apliance process, degradable in nature, and found in renewable resources form. The objective of this research is to obtain the proper formulation in rubber compound processing with the addition of castor oil epoxy. The exprimental design used in this study was Completely Randomized Design with two factors and two replications. The first factor was addition of softener concentrations (P) consisting of P1 = 3 phr epoxy castor oil, P2 = 6 phr epoxy castor oil and P3 = 9 phr epoxy castor oil. The second factor was antioxidantconcentrations (A) consisting of A1 = 1 phr antioxidant (phenolate), A2 = 2 phr antioxidant (phenolate) and A3 = 3 phr antioxidant (phenolate). The tested parameters by using rheometer were consisted of tensile strength, modulus and specific gravity. The results showed that addition of expoxy castor oil and antioxidant as well as their interaction had significant effect on tensile strength and modulus. The addition of epoxy castor oil had no significant effect on specific gravity. The best treatment was found in P1A3 (3 phr castor oilsoftener and 3 phr antioxidant). The testing results were as follows : rheometer (tC90.mnt) of 3.15 minutes, tensile strength of 166 kg/cm2, modulus of 13.8 kg/cm and specific gravity of 1.11 g/ml