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All Journal Majalah Kulit, Karet, dan Plastik
Hani Handayani
Pusat Penelitian Karet, Jalan Salak No. 1 Bogor 16151
Engineering

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The use of epoxidized natural rubber for producing rubber seals of LPG tube valves Hani Handayani; Mohammad Irfan Fathurrohman; Norma Arisanti Kinasih; Asron Ferdian Falaah
Majalah Kulit, Karet, dan Plastik Vol 37, No 2 (2021): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v37i2.6775

Abstract

Rubber seal of Liquifed Petroleum Gas (LPG) tube valves should fulfill Indonesian National Standard (SNI 7655:2010), which has high n-pentane resistance properties. This study aimed to design a rubber seal compound based on epoxidized natural rubber which fulfll SNI 7655:2010 requirements. The formulation of compound were designed by using epoxidized natural rubber with varied levels of epoxidation. Epoxidation reaction was occurred in an epoxidation reactor at 70 ºC for 6 hours with 0.75 mole/mole isoprene unit of hydrogen peroxide and 0.4 mole/mole isoprene unit of formic acid. Mechanical properties, ageing properties, and swelling performance in n-pentane of the modifed natural rubber were tested and the result compared to the minimum requirement of SNI 7655:2010. The result showed that the increasing in epoxidation level made natural rubber becomes more polar so it is more resistant to immersion in n-pentane. Epoxidized natural rubber with levels of 40% and 50% fulfilled specifcations for volume change in accordance with the quality requirements in SNI 7655:2010. The use of natural rubber created good elasticity to all level of epoxidized rubber where these properties are needed for rubber seal of LPG tube valve. However, the formulas of compound were less resistant to aging.
Peningkatan ketahanan oksidasi karet alam melalui pengikatan antioksidan 4-aminodifenilamina secara kimia Hani Handayani; Dadi R. Maspanger; Cynthia L Radiman
Majalah Kulit, Karet, dan Plastik Vol 32, No 2 (2016): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.097 KB) | DOI: 10.20543/mkkp.v32i2.1473

Abstract

Natural rubber is very important in supporting the Indonesian economy from non-oil sector. However, natural rubber is not resistant to oxidation. Various attempts have been made to overcome the weaknesses; one of them is the addition of antioxidants as additives in the manufacture of rubber goods. However, it has the disadvantage of mechanical technique, including antioxidant blooming, resulting in failed products and decrease in antioxidants ability. The aim of this research is to improve the resistance of natural rubber from oxidation through the chemically-bound antioxidant into epoxidized latex. Fresh latex was deproteinized using 0.06 phr papain. Latex was epoxidized using formic acid and hydrogen peroxide at 70°C with stirring speed of 700 rpm for 3 hours. Then the 4-Aminodiphenylamine (4-ADPA) antioxidant was added with three variations mole percent of 4-ADPA between 0.025 to 0.1 mol/100 grams of rubber, and four variations in temperature were applied (between 27-80°C). The results showed that the optimum condition for the binding was at 27°C at a dose of antioxidants as much as 0.1 mol/100 grams of rubber. The analysis of FTIR spectra revealed that the binding of 4-ADPA into the epoxidized latex was as much as 1.93 phr. The Rheometer curve analysis showed that the natural rubber bound 4-ADPA was more resistant to ageing based on the value of R300.Keywords: latex, antioxidant, epoxidation, 4-ADPA, natural rubber oxidation.
Co-Authors Asron Ferdian Falaah Cynthia L Radiman Dadi R. Maspanger Mohammad Irfan Fathurrohman Norma Arisanti Kinasih