主要工艺参数对三螺杆挤出机流动混合性能的影响
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摘要
采用Polyflow软件模拟了聚合物熔体PP在三螺杆挤出机计量段内的流动混合过程。借助统计学方法,将累积最大剪切应力分布、累积停留时间分布和混合指数作为评价指标,分析了主要工艺参数(喂料量和转速)对三螺杆挤出机流动混合性能的影响。同时进行PP/EPDM体系共混物制备实验,通过探究工艺参数对分散相粒径及其分布和力学性能的影响以验证数值计算结果。研究结果表明:喂料量和转速增大时,三螺杆挤出机的流动混合性能提高,但当喂料量和转速太大时却不利于三螺杆挤出机的流动混合。
Polyflow software was used to simulate the flow and mixing process of polymer melt PP in the measurement section of the triple-screw extruder. With the aid of statistical method,cumulative maximum shear stress distribution,and the cumulative residence time distribution and mixing index were used as the evaluation index for the analysis about influence of the main technological parameters( feed rate and rotational speed) on flow and mixing performance of screw extrusion. At the same time,the experiment of PP/EPDM system was carried out and the effect of process parameters on the particle size and its distribution and mechanical properties was explored to verify the numerical simulation results. The results of the study indicated that increasing the volume of feed and speed increases could improve the flow and mixing performance of triple-screw extruder. But when the volume of feed and speed was too high,it was not conducive to the flowing and mixing performance of triple-screw extruder.
Polyflow software was used to simulate the flow and mixing process of polymer melt PP in the measurement section of the triple-screw extruder. With the aid of statistical method,cumulative maximum shear stress distribution,and the cumulative residence time distribution and mixing index were used as the evaluation index for the analysis about influence of the main technological parameters( feed rate and rotational speed) on flow and mixing performance of screw extrusion. At the same time,the experiment of PP/EPDM system was carried out and the effect of process parameters on the particle size and its distribution and mechanical properties was explored to verify the numerical simulation results. The results of the study indicated that increasing the volume of feed and speed increases could improve the flow and mixing performance of triple-screw extruder. But when the volume of feed and speed was too high,it was not conducive to the flowing and mixing performance of triple-screw extruder.
引文
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[2]胡冬冬,陈晋南.啮合同向三螺杆挤出机中三维等温流动的数值模拟[J].化工学报,2004(2):280-283.
[3]胡冬冬,陈晋南.双螺杆挤出中聚合物熔体混合状态的统计学分析[J].中国塑料,2003,17(3):48-52.
[4]张文呈.三角形排列的全啮合三螺杆挤出机流场分析剪切分散和剪切温升计算研究[D].北京:北京化工大学,2007.
[5]张伟.同向三螺杆挤出机的混炼性能评价[D].北京:北京化工大学,2011.
[6]庞军舰.三螺杆挤出机混合特性的数值模拟和实验研究[D].北京:北京化工大学,2012.
[7]耿孝正.双螺杆挤出机及其应用[M].北京:中国轻工业出版社,2003.
[8]ZHU X Z,XIE Y J,YUAN H Q.Numerical simulation of extrusion characteristics for co-rotating tri-screw extruder[J].Polymer-Plastics Technology and Engineering,2007,46(4):401-407.
[9]庄园园,李翱,毕超,等.主要工艺参数对串联式磨盘挤出机混合性能的影响[J].塑料,2014,43(5):4-7.
[10]马昆,丁玉梅,邵剑波,等.固体粉末与聚合物在不同混炼元件中的混合性能[J].塑料,2013,42(4):21-45.
[11]朱向哲,王阁,何延东,等.啮合同向三螺杆挤出机中心区的复杂混合特性[J].高分子材料科学与工程,2012,28(12):173-178.
[12]董建华,王权,胡大年,等.三螺杆动态混炼挤出EPDM/PP共混物拉伸强度的研究[J].材料导报,2006,20(7):150-151.
[13]季斌,瞿金平,何光建,等.三螺杆动态混炼挤出机制备TPV的力学性能研究[J].中国塑料,2005,19(10):48-52.