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 by the conditions of the mixing process of raw materials and the compatibility between the phase. The purpose of this study was to determine the optimal temperature, rotor speed and compatibilizer. Thermoplastic vulcanizate was made in two stages. The first stage was the manufacture of rubber compounds using a roll mill at room temperature and speed of 20 rpm. Natural rubber materials used are natural rubber SIR 20. Curative ingredients and additives that are added include filler hybrid Carbon black/fly ash 30 phr, ratio 70/30, 5 phr paraffin, 5 phr ZnO, 3 phr stearic acid, 1 phr TMQ, 0,6 phr MBTS and 3 phr sulfur. The second phase of the resulting rubber compound was mixed with polypropylene (PP) and the compatibilizer 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 the mixing process at a temperature of 170oC, 175oC and 180oC and speed of 40, 60 and 80 rpm. The results showed that the morphology and properties of optimal TPV obtained at 175oC temperature, rotor speed of 40 rpm and MNR 5 phr.