내소음성과 내균열성을 가진 고무재료의 개발을 목적으로 NBR에 oleamide와 아라미드를 첨가하여 함량에 따른 가황특성, 물리적 성질, 내열성, 내유성, 내마모성, 내균열성 및 내소음성을 조사하였다. 가황특성과 Mooney 점도를 측정한 결과, 미가황고무의 가황특성은 oleamide의 양이 증가할수록 torque가 감소하였다. oleamide의 함량이 3 phr까지 증가함에 따라 경도 및 모듈러스 값은 조금씩 감소하였고 신장률은 감소하는 경향을 나타내었으며 인장강도는 거의 변화가 없었다. 내열성 시험(70시간, $120^{circ}C$) 및 내유성 시험(70시간, $40^{circ}C$)을 수행한 결과. 인장강도와 신장률이 모두 감소하였으며, TGA/DSC 분석 결과 첨가제에 따른 배합고무재료의 열적특성은 변화가 없었다. 기본물성, 내마모성, 내소음성 및 내균열성을 종합한 결과, NBR 227001 고무재료에서 내마모성과 내소음성에 대한 oleamide의 최적배합비는 3 phr였으며, 내균열성에 대한 아라미드의 최적배합비는 1 phr로 나타났다.
This study are conducted for the purpose of developing rubber material with noise and crack resistance. Cure characteristics, physical properties, thermal resistance, fuel resistance, abrasion resistance, crack resistance and noise resistance of NBR compounds with the various amounts of oleamide and aramid chip were investigated. From the measurements of cure characteristics and Mooney viscosities, cure characteristics of uncured rubber showed that a torque was decreased as the amount of oleamide increased. Hardness, modulus and elongation of rubber specimens tended to be reduced gradually, however, tensile strength remained unchanged as the amount of the oleamide increased. As a testing results of heat resistance for 70 hours at $120^{circ}C$ and oil resistance far 70 hours at $40^{circ}C$, tensile strength and elongation were all reduced. From the TGA/DSC analysis, there was no such a change observed in thermal characteristics of rubber materials. As a result of testing basic physical properties, abrasion resistance, noise resistance and crack resistance, the optimum ratio of oleamide to NBR was found to be 3 phr, while that of aramid to NBR 227001 was 1 phr.
