稀土镝掺杂炭黑填充型粉末NR的挤出特性研究

采用液相化学沉积法和凝聚共沉法制备稀土镝掺杂炭黑填充型粉末NR［P（NR/HAF-Dy）］，研究其毛细管挤出流变行为和复杂口型挤出特性，并与传统的炭黑填充型粉末NR［P（NR/HAF）］和NR/炭黑干法混炼胶（NR/HAF）进行比较。结果表明，在温度为90～150 ℃及剪切速率为20～1 500 s^-1的范围内，3种混炼胶的表观剪切粘度由小到大的顺序为P（NR/HAF-Dy），P（NR/HAF），NR/HAF；当Dy/HAF用量比为4/100时，P（NR/HAF-Dy）混炼胶具有较低的表观剪切粘度和稳定的非牛顿流体特性；与NR/HAF相比，P（NR/HAF）混炼胶具有较好的复杂口型挤出加工性能，P（NR/HAF-Dy）混炼胶的挤出性能则更为优良。;Dysprosium-modified carbon black filled powdered NR［P（NR/HAF-Dy）］ was prepared by liquid phase chemical deposition and coacervation coprecipitation，and its capillary extrusion rheological properties and Garvey die extrudability were investigated，compared with traditional carbon black filled powdered NR［P（NR/HAF）］ and NR/carbon black blends（NR/HAF） prepared through dry mixing.The results showed that in wide range of temperatures（90~150 ℃） and shear rates（20~1 500 s^-1），the order of the apparent shearing viscosity for 3 different mixes was as follows：P（NR/HAF-Dy）＜P（NR/HAF）＜NR/HAF.P（NR/HAF-Dy） possesses very low apparent shearing viscosity and stable non-Newtonian fluid flowing properties.The order of the Garvey die extrudability for 3 different mixes was as follows：P（NR/HAF-Dy）＞P（NR/HAF）＞NR/HAF