Influence of Mixing Procedure on Properties of Rubber Compounds Filled with Both Silica and Carbon Black

배합 공정이 실리카와 카본블랙으로 보강된 고무 배합물의 특성에 미치는 영향

  • Joo, Chang-Whan (Department of Textile Engineering, Chungnam National University) ;
  • Kim, Dong-Chul (Department of Textile Engineering, Chungnam National University) ;
  • Choi, Sung-Seen (Advanced Materials Research Center, Chungnam National University)
  • 주창환 (충남대학교 섬유공학과) ;
  • 김동철 (충남대학교 섬유공학과) ;
  • 최성신 (충남대학교 신소재연구소)
  • Published : 2002.03.31

Abstract

Silica-filled rubber compound needs longer mixing time compared to carbon black-filled one since it has poor dispersion or the filler. Influence of the mixing procedure on the properties of natural rubber compound filled with both silica and carbon black was studied. The discharge temperature of the master batch (MB) mixing was $150^{\circ}C$. The mixing time was longer when silica and carbon black were loaded separately than when loaded simultaneously. The mixing time was longer when silica was loaded first than when carbon black is loaded first. The compounds prepared by one MB step (conventional mixing) were compared with the compounds prepared by two MB steps (two-step mixing). Scorch times of the two-step mixing compounds were longer than those by the conventional mixing ones. Bound rubber contents of the formers were lower than those of the tatters. The two-step mixing vulcanizates had longer elongation at break, higher tensile strength, and better fatigue life.

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