Karakterisasi Komposit dari Paduan EPDM/NR SIR-20 dengan Pengisi Serbuk Tanah Liat (Clay) sebagai Peredam Benturan Pintu Kendaraan (Weather Strip)

Abstract

Composite research of EPDM/NR SIR-20 alloy with the addition of clay powder as a filler used as a car door impact absorber (weather strip). The weather strip was prepared by mixing SIR-20 natural rubber with EPDM synthetic rubber vulcanised by adding stearic acid, ZnO, MBTS, sulphur and varying the filler of clay powder in the ratio of 10 phr; 20 phr; 30 phr; 40 phr and 50 phr. The blend was then hot pressed at 125°C and subjected to tensile and impact tests. From the tensile test results, the best ratio was 30 phr filler with a tensile strength value of 3,5719 MPa, elongation 294,15% and modulus of elasticity 0,0121 MPa. The best impact test at 30 phr was 5,665 J/m2. EPDM/NR SIR-20 specimens with optimum filler content were subjected to FTIR, SEM and TGA analysis. The results of FTIR analysis showed no significant changes between EPDM, NR SIR-20, EPDM/SIR-20 and blends with optimum filler, there was only a shift in the wave numbers of several new absorption functional groups, and there wa a new absorption in blend samples with the addition of optimum clay powder at a wavelength of 827 cm-1, which is the Si-OH group. The SEM results obtained show a homogeneous surface, although some clumping is still present. The results of the thermal properties analysis showed that the decomposition occurred at temperature of 377,83⁰C - 529,58⁰C with a total mass loss of 71,443%.