Pengaruh variasi komposisi bahan pengisi carbon black dan silika pada sifat viskoelastis kompon karet untuk tread banThe effect of carbon black and silica filler composition variation to the viscoelastic properties of tire tread rubber compound ABSTRACT The rheological and viscoelastic properties of the rubber compound, especially for tire tread compound, are strongly influenced by the type of rubber and the filler used. These two properties greatly affect the final rubber product especially in terms of its mechanical properties. In the development of a product, research on these two properties is essential to obtain the optimum formulation. This study was aimed to determine the rheological and viscoelastic properties of tire compound using natural rubber (NR) and butadiene rubber (BR) materials by varying the composition of the carbon black and silica fillers. The base material of NR and BR with a ratio of 85/15 phr was mixed using a kneader device, while the ratio of carbon black / silica fillers was: 50/0, 40/10, 25/25, 10/40, and 0/50 phr. The rheology and viscosity properties were tested by using rubber process analyzer (RPA) TA Instrument Elite and dynamic mechanical analyzer (DMA) 7100 Hitachi. RPA testing was performed at frequency variation from 0.01-50 Hz at a temperature of 100 0 C with fixed amplitude 10 and an amplitude variation from 0.05-3.59 at a temperature of 90 0 C with a fixed frequency of 1 Hz. While viscoelastic testing with DMA was done using the tension-compression method with test temperature range at -80 0 -80 0 C. RPA test results showed the addition of silica affects the interaction between fillers indicated by differences in Payne effect. The energy of dissipation also shows a tendency to lower the heat build up, improve the mechanical properties and improve the abrasion resistance of rubber products with the addition of silica as the filler. It is also supported by DMA test results that showed wet skid resistance in silica addition comparable to the use of carbon black only and also increased rolling resistance significantly.
ABSTRAKSifat reologi dan viskoelastis pada kompon karet, terutama kompon tread ban, sangat dipengaruhi oleh jenis karet serta bahan pengisi yang digunakan. Kedua sifat ini sangat mempengaruhi hasil akhir dari produk karet terutama dalam hal sifat mekanisnya. Dalam pengembangan suatu produk, penelitian mengenai kedua sifat ini sangatlah penting untuk memperoleh formulasi yang optimum. Penelitian ini bertujuan untuk mengetahui sifat reologi dan viskoelastis dari kompon tread ban menggunakan bahan dasar karet alam (NR) dan butadiene rubber (BR) dengan memvariasikan komposisi bahan pengisi yaitu carbon black dan silika. Bahan dasar NR dan BR dengan rasio 85/15 phr dicampur dengan menggunakan alat kneader, sementara rasio bahan pengisi carbon black/silika adalah: 50/0, 40/10, 25/25, 10/40, dan 0/50 phr. Sifat reologi dan viskositas diuji dengan menggunakan rubber process analyzer (RPA) TA Instrument Elite dan dynamic mechanical analyzer (DMA) 7100 Hitachi. Pengujia...
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