Effects of Fluorine Rubber Compounds on Physical Properties of Various Reinforcing Agents According to the Type and Blending Content of Additives
Hyun-Ho Park and Chang-Seop Lee
Department of Chemistry, Keimyung University, Daegu, 42601, Republic of Korea
Abstract: Various reinforcing agents, acid acceptors, and vulcanization activators were blended with fluorine raw material rubber of different types and contents to investigate the hardness, tensile strength at fracture, elongation, and modulus according to the type and blending ratio of the additive. Tensile stress was also measured when the specimen was at 100% elongation. In addition, compression set that showed elastic variation at room or high temperatures were determined to assess the impact of blending agent. The hardness of general compounds should be 70 ± 5 pts. The tensile strength at fracture should be 130 ± 10 kgf/cm2 and the elongation should be 200 ± 50%. The content of compound that satisfied these conditions was 20 phr for reinforcing agents (N990), 3 phr for acid acceptors (MgO), 6 phr for vulcanization activators (Ca(OH)2), based on 100 phr for raw material rubber. Furthermore, additives that affected heat-resistance were acid acceptors. Among them, magnesium oxide worked as an effective heat-resistance enhancing additive for maintaining elasticity following heat resistance.
Keywords: FKM, Reinforcing agent, Acid acceptor, Vulcanization activator, Physical properties, Heat-resistance properties.