聚氨酯脲弹性体反应注射成型系统的动态流变特性

Study on the Dynamic Characteristies of PUU System in RIM Processes

摘要: 通过自制的狭缝式在线流变仪，实时测定了文题的动态流变特性，测得了反应注射成型过程中物料的粘度，第一、二法向应力差随剪切速率，反应程度的变化，结果表明，该系统随反尖的进行，逐步表现出非牛顿流体特征，粘度呈现剪切变稀效应，并表现出明显的法向应力差，而且随反应时间延长，其粘度，法向应力差均呈现增加的趋势。

Abstract: A small laboratory RIM machine,an on-line slit rheometer and an automatical data collection system have been used to run a fundamental study for two PUU(L-MDI/350E/DET DA/DBTDL)systems.The viscosity and normal stress difference during molding filling were measured.The results show that the rheological properties depand on shear rate and reaction time,The relationships a mong viscosity.normal stress differences,shear rate and reaction time were shown in 3D figures.