摘要
为了测试超声塑化的聚合物熔体流动性能,采用自行研制的阿基米德螺旋模具进行超声塑化微注射成型充填实验,通过充填长度表征聚合物的流动性能。以聚甲基丙烯酸甲酯(PMMA,无定型)、聚丙烯(PP,半结晶型)、聚酰胺66(PA66,结晶型)这3种不同类型的聚合物为对象,采用单因素实验法分别研究超声振幅、塑化时间、塑化压力、保压时间、保压压力、模芯温度等关键工艺参数对聚合物充填长度的影响规律。研究结果表明:提高超声振幅、延长塑化时间、增大塑化压力、提高模芯温度均能显著提高聚合物的流动性能,在相同条件下,这3种聚合物的充填长度L关系为LPA66>LPP>LPMMA;当保压时间从2s提高到6s时,这3种聚合物充填长度分别提高24.3%,21.1%和24.1%;充填长度与保压压力呈线性增长关系。研究结果可为建立超声塑化的聚合物流动性测试标准提供参考。
In order to test the fluidity of polymer melt plasticized by ultrasound,the ultrasonic plasticization filling experiment with self-designed spiral mold was conducted,and the fluidity was characterized by filling length.Three types of polymer material,i.e.,PMMA,PP and PA66,were used as the research objects.These experiments were made to explore the influence of factors on ultrasonic amplitude,ultrasonic time,plasticization pressure,holding time,holding pressure,mold core temperature and filling length.The results show that fluidity of polymers increases with the increase of amplitude,ultrasonic time,plasticization pressure and mold core temperature,and the length relationship of the three polymers at the same condition is LPA66>LPP>LPMMA.The holding time increases from2s to6s,and the filling length of three kinds of polymers increase by24.3%,21.1%and24.1%,respectively.And there is linear relationship between the holding pressure and filling length.The results provide reference for the establishment of ultrasonic plasticization polymer fluidity test standard.
作者
蒋炳炎
刘弢
吴旺青
张英平
邹洋
周啸天
JIANG Bingyan;LIU Tao;WU Wangqing;ZHANG Yingping;ZOU Yang;ZHOU Xiaotian(State Key Laboratory of High-Performance Complex Manufacturing,School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第12期2939-2945,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51575540)
中南大学研究生创新项目(2017zzts401).
关键词
超声塑化
微注射成型
聚合物
流动性
ultrasonic plasticization
microinjection mold
polymer
fluidity
