Optimalisasi Kondisi Proses Pencampuran untuk Meningkatkan Morfologi dan Sifat Thermoplastic Vulcanizate Berbasis Karet Alam dengan Compatibilizer Maleated Natural Rubber

Abstract

Morphology and properties of thermoplastic vulcanizate is strongly influenced b ythe conditions of the mixing process of raw materials and the compatibilit ybetween the phase. The purpose of this study was to determine the optimaltemperature, rotor speed and compatibilizer. Thermoplastic vulcanizate was madein two stages. The first stage was the manufacture of rubber compounds using a rollmill at room temperature and speed of 20 rpm. Natural rubber materials used arenatural rubber SIR 20. Curative ingredients and additives that are added includefiller hybrid Carbon black/fly ash 30 phr, ratio 70/30, 5 phr paraffin, 5 phr ZnO, 3phr stearic acid, 1 phr TMQ, 0,6 phr MBTS and 3 phr sulfur. The second phase ofthe resulting rubber compound was mixed with polypropylene (PP) and thecompatibilizer maleated natural rubber (MNR) in the internal mixer. Ratio of NR /PP made it 70/30, while the MNR varied 2 and 5 phr. Varying conditions in themixing process at a temperature of 170oC, 175oC and 180oC and speed of 40, 60and 80 rpm. The results showed that the morphology and properties of optimalTPV obtained at 175oC temperature, rotor speed of 40 rpm and MNR 5 phr.