사출성형에 의한 열가소성 엘라스토머의 기계적 성질 및 재활용성에 관한 연구

Abstract

In these days, recycling of plastic material has became a major issue due to the environmental problem. By this global movement, thermoplastic elastomer (TPE) which can be injected such as commercial thermoplastics comes into the spotlight. Moreover TPE has being widely applied to automobile parts, household goods and sports equipment as alternatives for ethylene propylene diene rubber (EPDM). In this study, the effects according to the number of recycling and molding conditions such as melt temperature, injection pressure and injection rate on the mechanical properties, fluidity and shrinkage characteristics of thermoplastic vulcanizates were investigated. The mechanical properties are tensile strength and hardness. To verify the variations in mechanical properties, morphology was analyzed by scanning electron microscope (SEM). From this study, the following conclusions were drawn: the first recycled TPV’s tensile strength was higher than the virgin one within the restricted range. However, the tensile strength after first recycled gradually decreased. As recycling times increased, hardness gradually decreased. but, the recycled TPV's flow length increased. However, though the number of recycling increased, the variation of shrinkage was little.