Study on Synthesis and Properties of Water-born Polyurethane

수분산성 폴리우레탄의 합성 및 물성에 관한 연구

  • Cho, Ur-Ryong (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Choi, Seo-Yoon (Hoimyung Semiclean Co., Ltd)
  • 조을룡 (한국기술교육대학교 응용화학공학과) ;
  • 최서윤 (회명세미크린㈜)
  • Published : 2005.12.31

Abstract

Polyurethane(PU) prepolymers were prepared from polyol and diisocyanate. Unionized PU prepolymers were synthesized from poly(propylene glycol)(PPG, MW: 1000), 2,2-bis (hydroxymethyl) propionic acid(DMPA), and isophorone diisocyanate(IPDI) by prepolymer syhthesizing process. After PU prepolymers were dispersed into water, the physical properties were investigated by changing the molar ratio of polyol and diisocyanate. The results showed a stable state with the best physical properties when the prepolymer was composed of PPG/DMPA with hard segment=40%, NCO%=3.43%, [NCO]: [OH]=1.5: 1.0 in molar ratio, and was dispersed into water with 30% solid content. PU prepolymers also were synthesized with various molar ratio of PPG and DMPA. Upon higher molar ratio of DMPA, particle size of polyurethane dispersion(PUD) gradually decreased. PU-prepolymers prepared from the various blocking agents represented characteristic initial deblocking temperatures that depended on the blocking agents, and the beginning of deblocking occured within 30 mins on all the blocking agents used.

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