A Study on the Life Time Prediction and Acid-Heat aging Property of NBR Rubber for Fuel Cell Gasket

연료전지 카스켓용 NBR 고무의 산-열 노화 특성과 수명예측에 관한 연구

  • Kim, Mi-Suk (School of Polymer Science & Engineering, Gyeongsang national University) ;
  • Kim, Jin-Hak (School of Polymer Science & Engineering, Gyeongsang national University) ;
  • Kim, Seok-Jin (R&D center, Dong-A Hwa Sung Co., Ltd.) ;
  • Kim, Jin-Kuk (School of Polymer Science & Engineering, Gyeongsang national University)
  • 김미숙 (국립경상대학교 고분자공학과) ;
  • 김진학 (국립경상대학교 고분자공학과) ;
  • 김석진 (동아화성(주)) ;
  • 김진국 (국립경상대학교 고분자공학과)
  • Published : 2007.03.31

Abstract

Material characteristics and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, the NBR compound was prepared by sulfur-cure system, and was used in predicting the lifetime of rubber gasket made by the compound. The accelerated material aging was investigated at different temperatures at 120, 140 and $160^{\circ}C$ and aging time from 3 hours to 600 hours at 5, 6, 7 vol %. of $H_2SO_4$ concentrations The rubber strips were placed in acid solution using pyrex g1ass tube. Both ends of pyrex g1ass tube were sealed to avoid evaporation of solution during heating at given time. The material test and accelerated acid-heat aging test were carried out to predict the useful life of NBR rubber gasket for a fuel cell stack. In order to investigate the effects of acid-heat aging on the properties of the NBR, tensile strength, elongation at break, hardness and crosslink-density were measured. The tensile strength decreases as the $H_2SO_4$ concentrations and temperature increase. Results were evaluated using Arrhenius equation.

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