The Effects of Cure System on Vulcanization Reaction Constant and Physical Properties of Rubber Compounds

가황시스템 변화가 배합고무의 가황반응속도 및 물리적 특성에 미치는 영향

  • Lee, Seag (Kumho Research and Development Center) ;
  • Park, Nam Cook (Department of Chemical Engineering, Chonnam National University)
  • 이석 (주) 금호타이어 연구소) ;
  • 박남국 (전남대학교 공과대학 화학공학과)
  • Received : 1998.12.19
  • Accepted : 1999.02.25
  • Published : 1999.05.10

Abstract

In this study, the reaction rate constant, activation energy, total crosslinking density, elastic constant, cure properties ($t_5,\;t_{90}$), modulus, and abrasion resistance of rubber compounds were investigated as a function of cure temperatures, cure systems and reinforcing filler loadings. Reaction rate constants showed strong dependence on thc carbon black loading, cure temperature and cure system, and increased sharply with increasing the reaction temperatures. The lowest activation energy was obtained in the efficient cure (EC) system which corresponds to the high level of sulfur to accelerator ratio, and the activation energy was decreased with decreasing the carbon black loadings. The change of carbon black loadings directly affects the modulus and abrasion resistance, but the change of cure system showed various effects on the rubber compounds. Increased carbon black loadings showed the high modulus, improved abrasion resistance and short scorch time but decrease in crosslinking density and elastic constant. Higher crosslinking density and elastic constant were shown in the EC cure system regardless of carbon black loadings, but scorch timc ($t_5$) was not affected by the change of the ratio of sulfur to accelerator. Rapid optimum cure time ($t_{90}$) were showen in the EC cure system. Also, the equivalent cure curve coefficient of rubber compound was 0.96 for conventional cure (CC) system, and 0.94 for semi-efficient cure (SEC) and EC system regardless carbon black loadings. As regarding the abrasion resistance, wear volume showed the logarithmic increase for the loaded weight.

Keywords

Cure System;Crosslinking Density;Reinforcement;Carbon Black

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