Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Preparation and Properties of EPDM/Thermoplastic Polyurethane Scrap Blends

EPDM/열가소성 폴리우레탄 스크랩 블렌드의 제조 및 물성

  • Lee, Young-Hee (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Kang, Bo-Kyung (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Yoo, Hye-Jin (POSCO Technical Research Laboratories) ;
  • Kim, Jung-Soo (Korea Institute of Footwear & Leather Technology) ;
  • Jung, Young-Jin (Department of Biomaterial Science, Pusan National University) ;
  • Lee, Dong-Jin (Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Han-Do (Department of Organic Material Science and Engineering, Pusan National University)
  • 이영희 (부산대학교 유기소재시스템공학과) ;
  • 강보경 (부산대학교 유기소재시스템공학과) ;
  • 유혜진 (포스코 기술연구소) ;
  • 김정수 (한국신발.피혁 연구소) ;
  • 정영진 (부산대학교 바이오소재과학과) ;
  • 이동진 (한국세라믹기술원) ;
  • 김한도 (부산대학교 유기소재시스템공학과)
  • Published : 2009.09.30
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Abstract

The thermoplastic polyurethane waste (TPU-S) with good tensile properties, hardness, NBS abrasion resistance, specific gravity and low wet coefficient of kinetic friction was melt-blended with ethylene propylene diene monomer rubber (EPDM) with high wet slip resistance and low mechanical properties to form EPDM/TPU-S blend films, and their composition-property relationship was investigated to find the optimum composition for shoe outsole material. The properties except the wet slip resistance increased with increasing TPU-S contents in the blend. All the properties except elongation at break, specific gravity and the wet coefficient of kinetic friction in the range of $0{\sim}65\;wt%$ of TPU-S did not attain the values predicted by the simple additive rule. The optimum weight ratio of EPDM/TPU-S for the application to the typical shoe outsole material was found to be 30/70.

높은 강도, 경도, 신율, 비중 및 내마모성 등을 가진 채 폐기되는 열가소성 폴리우레탄 스크랩(TPU-S)과 습윤 상태의 내슬립성은 높으나 기계적 물성이 떨어지는 EPDM 고무의 용융 블렌드를 통해 신발 소재용 필름을 제조하고 조성과 특성과의 관계를 연구하였다. 블렌드 중의 TPU-S의 함량이 증가함에 따라 강도, 신도, 내마모성, 비중 및 경도 등 모든 물성이 증가하였으나, 습윤 상태의 내슬립성(동적마찰계수)은 크게 감소하였다. TPU-S 함량의 증가에 따라 블렌드의 파단신율은 단순혼합법칙 이상으로 증가하였으며, 습윤 상태의 내슬립성은 TPU-S가 $0{\sim}65%$ 범위에서 단순혼합법칙 이상이었다. 그러나 인장강도, 비중 및 내마모성은 모두 단순혼합법칙보다 낮은 값을 나타내었다. 이들 블렌드의 조성-특성 관계의 결과로부터 일반적으로 요구되는 신발 겉창용 소재의 물성에 충족되는 EPDM/TPU-S 블렌드의 조성은 무게비가 30/70인 것을 알 수 있었다.

Keywords

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