Abstract
Diversification of rubber goods are highly needed to enhance natural rubber domestic consumption. One of the efforts is by using thermoplastic natural rubber that is synthesized from emulsion graft copolymerization of natural rubber latex with thermoplastic monomer as index viscosity improver of lubricating oil. The research aimed to study the effect of thermoplastic natural rubber (natural rubber–styrene copolymer) addition, at various concentration, into base paraffinic lube oil (HVI 60 and HVI 650) on index viscosity value of lubricating oil. The result showed that emulsion graft copolymerization at composition ratio of natural rubber to styrene monomer 85:15, at 65oC for 7 hours, with addition of 1% ammonium peroxidisulfate as initiator and 2% sodium dodecyl sulfate as surfactant produced thermoplastic natural rubber (TPNR, copoly NR-ST) with grafting efficiency of 56,48%. The TPNR can be functioned properly as index viscosity improver at 5% concentration to base paraffinic lube oil either HVI 60 or HVI 650. The obtaining new lubricating oils could fulfill the index viscosity standard requirement refered to Decree of Directorat General of Oil and Gas No 85K/34/DDJM/1998, and could compete with the commercial lubricating oil type 20W-50, 10W-40, and 15W-40.
Highlights
ABSTRAK Diversifikasi barang jadi karet alam sangat diperlukan untuk mendukung peningkatan konsumsi domestik produksi karet alam nasional
of the efforts is by using thermoplastic natural rubber
that is synthesized from emulsion graft copolymerization of natural rubber latex
Summary
Reaksi kopolimerisasi cangkok termoplastik vinil seperti monomer stirena dalam lateks karet alam selalu disertai dengan reaksi homopolimerisasi pembentukan homopolimer stirena akibat sifat monomer stirena yang sangat reaktif (Songsing et al, 2013; Kohjiya & Ikeda, 2014). TPNR yang terbentuk dari hasil perpaduan karet alam dengan stirena juga memiliki ketahanan terhadap oksidasi karena telah teradisinya ikatan C=C dalam karet alam oleh monomer termoplastik serta memiliki kestabilan panas yang baik selain bobot molekul yang lebih besar daripada karet alam murni (Puspitasari, 2015). Penelitian ini bertujuan mempelajari pengaruh penambahan berbagai dosis TPNR yang diperoleh dari hasil modifikasi karet alam fase lateks secara kopolimerisasi cangkok emulsi dengan monomer stirena terhadap peningkatan indeks viskositas minyak lumas dasar jenis parafinik
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