Abstract
The NBR/EPDM blend has a great ozone, oil, and heat resistance. Carbon black is the most commonly used filler material for rubber goods. But, it is less environmentally friendly and less healthy friendly. In this study, we will study the use of natural zeolite as a substitute for the filler. This blend was carried out by a two-roll mill and tested by rheometer and tensile strength tester. From the research that has been done, it is known that vulcanizate with carbon black is better than all of the vulcanizate using zeolite as filler substitute. Vulcanizate with CB provide the fastest curing time, the fastest reaction speed and also the best mechanical properties. Vulcanization with the 10 phr zeolite gives the optimum curing time and the best mechanical properties compared to the substitution of other fillers. This shows that 10 phr zeolite (16.7%) can be a suitable filling material for NBR/EPDM blend.
Highlights
IntroductionNitrile butadiene rubber (NBR) has good solvent and oil resistance properties but has poor heat and ozone resistance
The materials used in this study were Nitrile butadiene rubber (NBR) (ACN 48.5%, Krynac 4975 F), EPDM (ENB 8.7%, Keltan 4551 A), carbon black N330 High Abrasion Furnace (HAF) (OCI, Korea), and natural zeolite from local market in Klaten, Indonesia as filler, paraffinic oil (Indrasari), paraffin wax (Antilux 654 A) as antioxidant, stearic acid Aflux 42 M (Rhein Chemie), and zinc oxide (ZnO, Indoxide) as activator, 6PPD (Starchem) as antiozonant, 2,2’dithiobis(benzothiazole) (MBTS) Kemai as accelerator, and sulfur (Miwon) as vulcanizing agent
The filler material was varied by 100% of Carbon black (CB), 91.2% of CB (5 phr zeolite), and 83.3% of CB (10 phr zeolite) for both unmodified zeolite and modified zeolite
Summary
Nitrile butadiene rubber (NBR) has good solvent and oil resistance properties but has poor heat and ozone resistance. NBR is synthetic rubber containing acrylonitrile (ACN) and butadiene which determines its polarity and the heat and oil resistance (Jovanović et al, 2009; Indrajati et al, 2012; Kantala et al, 2009; Jovanović et al, 2013). Ethylene diene monomer butadiene rubber (EPDM) is a nonpolar synthetic rubber that has ethylidine-2-norbornene (ENB) content. EPDM has good ozone and heat resistance but is less resistant to nonpolar solvents (Jovanović et al, 2013; Ning et al, 2014; Mayasari & Yuniari, 2016). The blend of NBR and EPDM can produce composites with better heat, oil, and ozone resistance than NBR or EPDM composites separately as previous research by Jovanović et al (2013)
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