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All Journal Jurnal Teknologi Logic : Jurnal Rancang Bangun dan Teknologi Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Mertza Fitra Agustian
Politeknik ATK Yogyakarta
Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Social Sciences

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Effect of UV Aging on Physical Properties of Vulcanized Rubber with the Addition of Reclaimed Rubber Muh. Wahyu Syabani; Yuli Suwarno; Mertza Fitra Agustian
Logic : Jurnal Rancang Bangun dan Teknologi Vol 19 No 3 (2019): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (693.895 KB) | DOI: 10.31940/logic.v19i3.1469

Abstract

Rubber solid waste amount increased continuosly and caused environmental problem since it is very difficult to be naturally degraded. Therefore, the interest of using rubber waste as raw material for new rubber product is increased. Reclaimed rubber can be used as filler aditif for rubber processing. The aim of this research was to study the effect of UV aging on the rubber product as the reclaimed filler added. The mixing of the rubber and the additives used the kneader and open mill. The vulcanization process was done by hydraulic press. In this research, the reclaimed rubber addition was varied as follows: 12,5; 37,5 and 62,5 phr. The products quality differences before and after the UV aging evaluated using physical tests. The result of FTIR showed that the polymer chain were broken by ultraviolet radiation. The physical test gives result that the hardness and tensile strength decreased, but the elongation is increased after UV aging.
Pengaruh Waktu dan Suhu Penyimpanan Kompon Karet terhadap Karakteristik Vulkanisasi Muh. Wahyu Syabani; Suharyanto Suharyanto; Mertza Fitra Agustian; Lestari Hetalesi Saputri
Jurnal Teknologi Vol 10, No 2 (2023): Jurnal Teknologi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/jtek.v10i2.223

Abstract

A rubber compound is an intermediate product resulting from mixing rubber with other additives before being molded through a vulcanization process. Frequently, there is a delay between the compounding process and vulcanization, therefore proper storage procedures must be prepared. The presence of a vulcanizing agent, activator, and accelerator in the compound allows the vulcanization reaction to occur during the storage period. This study aims to analyze the effect of the storage time and temperature of rubber compounds on rubber vulcanization characteristics. The rubber compound is stored at room temperatures of 25oC and 32oC. On the 1st, 3rd, and 5th day of storage, the compounds were tested using a rheometer to obtain vulcanization parameter data. The values of MH, ML, ts2, tc90, cure rate index (CRI), and effective torque of each treatment were studied. The results showed that the storage time of the compound affected each of the observed parameters. In the range of 5 days, the longer time indicates the formation of polysulfide crosslinks in the rubber polymer chain network. Higher storage temperature also faster reaction rate during storage. The increasing number of cross-links resulting a longer induction period dan vulcanization time, lower CRI, and effective torque.
Pengaruh Geothermal Silica terhadap Ketahanan Pelarut dari Komposit Karet Ditinjau dari Karakteristik Swelling dan Crosslink Density Muh. Wahyu Syabani; Mertza Fitra Agustian; Wisnu Pambudi; Suharyanto; Warmiati; Muhammad Ikhwan
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 21 No 1 (2022): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1255.315 KB)

Abstract

Karet jenis poliisoprena, styrene butadiene rubber dan polybutadiene rubber dapat menghasilkan produk karet dengan karakteristik mekanik yang baik dan berbiaya rendah. Akan tetapi, jenis karet tersebut tidak memiliki ketahanan terhadap minyak yang baik. Penggunaan filler dapat memperbaiki kelemahan ini dengan memberikan interaksi antara filler dan karet sehingga memperbaiki struktur jejaring karetnya. Penelitian ini dilakukan untuk mempelajari pengaruh penggunaan as-given geothermal silica (AGS) dan silika komersial dalam jumlah tertentu sebagai filler terhadap nilai swelling dan crosslink density kompon karet. Vulkanisat karet disiapkan menggunakan alat two roll mill dan press molding. Sampel diuji swelling menggunakan dua jenis pelarut pada suhu yang berbeda, yaitu n-Pentana pada suhu kamar dan oli pada suhu 100oC. Nilai crosslink density didekati dengan tiga metode yaitu perhitungan modulus, pendekatan sarkawi dan persamaan flory-rehner. Hasil penelitian menunjukan jika vulkanisat karet yang diperkuat dengan AGS memiliki nilai crosslink density yang lebih tinggi dibandingkan chemisil. Sampel komposit memiliki ketahanan yang baik pada pelarut n-Pentana pada suhu kamar. Akan tetapi, kedua vulkanisat menunjukan nilai swelling yang tinggi saat berkontak dengan oil pada suhu 100oC.
Co-Authors Muh. Wahyu Syabani Muhammad Ikhwan Saputri, Lestari Hetalesi Suharyanto Suharyanto Suharyanto Warmiati wisnu pambudi Yuli Suwarno