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Fabrication of Silica-Containing Breathable Waterproof Polyurethane Dispersion Film

Silica를 함유하는 Polyurethane dispersion 투습방수 Film의 제조

  • Shin, Hyun-Ki (Department of Textile System Engineering, Kyungpook National University) ;
  • Huh, Man-Woo (Department of Nursing, Kyungil University) ;
  • Yoon, Nam-Sik (Department of Textile System Engineering, Kyungpook National University)
  • 신현기 (경북대학교 섬유시스템공학과) ;
  • 허만우 (경일대학교 간호학과) ;
  • 윤남식 (경북대학교 섬유시스템공학과)
  • Received : 2015.05.16
  • Accepted : 2015.06.16
  • Published : 2015.06.27

Abstract

Silica-polyurethane hybrid breathable films were prepared and their breathabilities were assessed. Appropriately aggregated silica was prepared through sol-gel reaction of water glass and its particle size ranged 360~500nm. The polyurethane dispersion was prepared by the reaction of isophorone diisocyanate(IPDI) as diisocyanate and polytetramethylene glycol(PTMG) and dimethylol propionic acid(DMPA) as polyol, particle size ranging 30~120nm. The reaction between isocyanate and hydroxyl group to form urethane bonding was checked by the intensity of the stretch peak of isocyanate at $2270cm^{-1}$ in the FT-IR. The silica was incorporated into polyurethane dispersion and casted into film. It was shown that the incorporated silica(1~5wt.%) increased water vapour permeability of the films by 30~100%, and decreased the hydrostatic pressure by 10~40%. From the results, it could be concluded that the appropriate hybridization of silica can increase the breathability of polyurethane dispersion film, while minimizing the loss of hydrostatic pressure.

Keywords

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