Blending ethylene propylene diene monomer (EPDM) with chloroprene rubber (CR) and nitrile-butadiene rubber (NBR) was carried out to develop a rubber having similar thermal and oil resistance to that of CR. Both thermal and oil resistance of rubber compounds were studied based on these rubber blends. The CR/EPDM compounds showed improved thermal resistance, but the oil resistance was not satisfactory due to the poor miscibility between CR and EPDM. The NBR/EPDM compounds showed improved thermal resistance, but the oil resistance was not satisfactory as the EPDM content increased in the blend. The NBR/EPDM compounds, which were compatibilized with CR or bromo isobutylene isoprene rubber (BIIR), showed the improved thermal and oil resistance at the compatibilizer content of 5 phr. NBR/EPDM compound, which was compatibilized with CR and had a finer distribution of NBR, was more effective in improving oil resistance compared to the NBR/EPDM compound compatibilized with BIIR.

Chloroprene rubber(CR)의 내열 및 내유 특성과 유사한 물성의 고무 소재로 ethylene propylene diene monomer(EPDM)과 CR 및 nitrile-butadiene rubber(NBR) 고무 블렌드를 개발하고자 하였다. 이러한 블렌드를 기반으로 고무 컴파운드를 제조하여 그 특성을 조사하였다. CR/EPDM 컴파운드는 내열 특성이 향상되었지만 상용성이 우수하지 못하여 내유 특성이 저하되었다. NBR/EPDM 컴파운드는 내열 특성이 향상되었지만 EPDM 조성이 증가함에 따라 내유 특성이 저하되었다. CR 또는 bromo isobutylene isoprene rubber(BIIR)로 상용화된 NBR/EPDM 컴파운드는 CR 및 BIIR 함량 5 phr에서 내열 및 내유 특성이 향상되었다. BIIR보다 CR로 상용화된 NBR/EPDM 컴파운드가 NBR 성분을 더 균일하게 분산시켜 내유 특성 향상에 효과적이었다.

Keywords: nitrile-butadiene rubber/ethylene propylene diene monomer blend, compatibilizer, rubber compound, oil resistance, thermal resistance.