A Study on Rheological Properties for Preparing Flow Mark Free PP Compounds

흐름자국이 없는 PP 복합소재 제조를 위한 유변학적 특성 연구

  • Lee, Yong-Hee (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Nam, Byeong-Uk (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Lim, Jae-Gon (Samsung Total Petrochemical Co.) ;
  • Choi, Chi-Hoon (Hyundai-Kia Motor Co.)
  • Published : 2009.06.30


Our objective is to increase the flowability of Polypropylene(PP) compounds and achieve flow mark free surface in injection molded specimen. We have investigated flowabilities of PP compounds which were composed of PP, rubber, talc, and trace amount of additives. Flowability measurement was performed with four types PPs of which molecular weight distributions(MWD) and melt indexes(MI) were different. Rheological properties of the PP compounding materials, such as spiral flow(SF) length, MI, and shear viscosity, were evaluated. When PP with the broad MWD was used, there were remarkable cases where the spiral flow length of low MI PP compound was longer than that of higher MI PP compound. The PP compound having low MI but broad MWD PP has more flowability than the compound with only high MI.


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