A Study on the Characteristics of IR/CR Rubber Blends by Surface Treatment with Chlorine
Ji-Hye Park, Hyun-Ho Park and Chang-Seop Lee
Department of Chemistry, Keimyung University, 1095 Dalgubeol-Daero Dalseo-Gu, Daegu, 42601 Republic of Korea
Abstract: In this study, blend materials were prepared according to the blending ratios of IR and CR. Physical and chemical properties of the blend materials were investigated before and after the surface of blend materials were chlorinated. In addition, the effect of surface treatment with chlorine on the friction coefficient was investigated through friction test. For the physical properties, with increasing contents of CR, the cross linking rate became slower and the mechanical properties including tensile strength and elongation were decreased. The change of physical properties was decreased before and after aging, when the contents of CR were increased and the blend materials were chlorinated. For chemical properties, with increasing contents of CR, the surface distribution was improved. The surface of samples was uniformly treated in a constant direction and their smoothness and gloss were improved. With increasing the contents of CR, the friction coefficient was decreased sharply at the initial stage of the surface treatment but the decrease in the friction coefficient slowed down when the concentration of chloride in the treatment solution was increased. In conclusion, physical, chemical and friction properties suggest that the optimal ratio of CR to IR/CR blend materials is 30 phr.
Keywords: Warpage, Injection Molding, Rib, PC, ABS, PP, PA66, Packing Time.