Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Effects of Vulcanization Type end Temperature on Physical Properties of Natural Rubber Compounds

가황형태 및 온도가 천연고무 컴파운드의 물리적 특성에 미치는 영향

  • Rhee, John-M. (School of Advanced Materials, Chonbuk National University) ;
  • Yoon, Chan-Ho (Department of Environmental Hygine, Dongkang College) ;
  • Huh, Yang-Il (Faculty of Applied Chemistry, Chonnam National University) ;
  • Han, Seung-Cheol (R&D Center of Kumho Tire Co.) ;
  • Nah, Chang-Woon (School of Advanced Materials, Chonbuk National University)
  • 이종문 (전북대학교 신소재공학부) ;
  • 윤찬호 (동강대학 환경위생과) ;
  • 허양일 (전남대학교 응용화학과) ;
  • 한승철 (금호타이어 연구소) ;
  • 나창운 (전북대학교 신소재공학부)
  • Published : 2000.09.30
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Abstract

Cure characteristics. tensile properties, and dynamic properties were investigated on the carbon black-filled natural rubber compounds, in which three typical vulcanization types conventional vulcanization(Conv), semi-efficient(Semi-EV), and efficient(EV) vulcanizations were used. The effects of vulcanization temperature on both the mechanical property and aging resistance of rubber compounds were also investigated. The Conv cure system showed a slightly slower rate of vulcanization than those of Semi-EV and EV ones. On the other hand, it showed a higher value in the maximum torque of cure curve. Higher tensile moduli were observed in Conv system than those in Semi-EV and EV ones, while lower elongation at break were obtained in Conv one. The tensile strength at break were found to be about the same for three cute systems. Hardness, modulus, and tensile strength decreased with increasing the vulcanization temperature, and the degree of changes in the properties was found to be smaller for EV and Semi-EV systems than that in Conv one. The EV system was found to be superior in thermal-aging resistance to Conv one.

3가지 대표적인 가황계인 conventional vulcanization(Conv), semi-efficient vulcanization (Semi-EV), efficient vulcanization(EV)방법을 카본블랙 충전 천연고무 배합고무에 대해 적용하고, 이들 가황계에 따른 가황특성, 인장특성, 동적 점탄성을 조사하였다. 또한 가황온도가 배합고무의 기계적 물성과 노화저항성에 미치는 영향도 조사하였다. Conv 가황계가 Semi-EV나 EV 가황계에 비해 가황속도는 낮았으나 최대 토오크는 높았다. 인장특성은 Conv 가황계가 Semi-EV나 EV 가황계에 비해 높은 모듈러스를 나타내었고, 파괴점에서의 인장강도는 유사한 반면 신장율은 낮았다. 가황온도 증가에 따라 경도, 모듈러스 및 인장강도는 감소하였고, 감소 정도는 EV나 Semi-EV 가황계가 Conv 가황계보다 낮았다. 또한 열노화에 대한 저항성은 EV 가황계가 Conv 가황계보다 월등히 우수하였다.

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