Effect of processing parameters on the properties of two-component injection molded recycled polypropylene/ethylene propylene diene monomer automotive parts

Abstract

Two-component (2K) injection molding of the combination of recycled polypropylene (rPP) and ethylene propylene diene monomer (EPDM) is very promising for automotive industry. Recently, the use of post-industrial wastes in the automotive industry became important in terms of reducing its environmental impacts and circular economy principles. In this study, the effect of processing parameters on the properties of rPP/EPDM deflector parts fabricated by means of a 2K injection molding process was investigated. Post-industrial waste PP was used in varying amounts (0%, 10% and 20% by weight) in rPP/EPDM parts. The properties of aged and unaged rPP/EPDM deflector parts were then compared. The effects of processing parameters on dimensional, mechanical, thermal, and morphological properties of rPP/EPDM parts were investigated by a coordinate measuring device (CMM), scanning electron microscope (SEM), tensile test, and differential scanning calorimetry (DSC) analysis. As a result of the CMM analysis, it was seen that the dimensional stability of the unaged parts was better than the aged parts. The adhesion between rPP and EPDM was found to be dependent on injection temperatures.