螺杆构型对PLA/PTW共混物性能影响的研究  

Effect of screw configuration on performance of PLA/PTW blends

作　　者：马秀清[1] 劳志超 李明谦 韩顺涛 胡楠 MA Xiuqing;LAO Zhichao;LI Mingqian;HAN Shuntao;HU Nan(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;China Nuclear Power Engineering Co,Ltd,Beijing 100840,China;Research Institute of Aerospace Special Materials and Process Technology,Beijing 100074,China)

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]中国核电工程有限公司,北京100840 [3]航天特种材料及工艺技术研究所,北京100074

出　　处：《中国塑料》2023年第11期127-134,共8页China Plastics

摘　　要：选用剪切元件(KB元件)、拉伸元件(S元件)、常规螺纹元件(SE元件)和混合元件(SME元件)设计了4种啮合同向双螺杆挤出机混合段螺杆构型,模拟研究了螺杆构型对聚乳酸/乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯共聚物(PLA/PTW)共混体系混合效果的影响,分别通过出入口压差、加权平均剪切应力、累积最大剪切应力、回流系数和累积停留时间表征了螺杆构型的正向输送能力、分散混合能力和分布混合能力,并采用实验方法研究了复合材料的力学性能。结果表明,KB元件和SME元件分散布置时具有较强的分散混合和分布混合能力,PLA/PTW共混体系的混合效果更好,且能在PLA/PTW共混物拉伸强度基本不变的情况下进一步提高其冲击强度,同时,模拟结果和实验结果吻合,表明模拟可为混合段螺杆构型的优化提供指导。Four types of screw configurations in the mixing section were designed for a co-rotating twin screw extruder using shear elements(KB-elements),tensile elements(S-elements),conventional threaded elements(SE-elements),and mixed elements(SME elements).The influence of screw configuration on the mixing effect of poly(lactic acid)PLA/ethylene-butyl acrylate-glycidyl methacrylate copolymer(PTW)blends was simulated and studied.The forward conveying ability,dispersion mixing ability,and distribution mixing ability of the screw configuration were investigated through employing the pressure difference between the inlet and outlet,weight-average shear stress,cumulative maximum shear stress,backflow rate,and cumulative residence time,respectively.The mechanical properties of as-prepared composite materials were studied using an experimental method.The results indicated that KB elements and SME elements had strong dispersion and distribution mixing abilities,and the PLA/PTW blends obtained a better mixing effect.Such a screw configuration could further improve the impact strength of the composite materials,whereas their tensile strength almost kept stable.At the same time,the simulation results were consistent with the experimental ones,indicating that the simulation can provide guidance for optimizing the screw configuration in the mixing section.

关 键 词：螺杆构型 混合性能 数值模拟 力学性能 

分 类 号：TQ320.7[化学工程—合成树脂塑料工业]