摘要
根据聚氯乙烯(PVC)混配料的黏度-温度特征,进行了500 mm管径的硬聚氯乙烯(PVC-U)轴向中空壁管的非等温挤出过程数值模拟,研究了温度对管材挤出过程的影响,优化了PVC-U轴向中空壁管的挤出工艺。研究结果表明:温度梯度对管材的挤出速度有较大影响,而温度对管材的压力降影响不大。在合流段、扩张段、压缩段、成型段和出口段温度分别为165、170、175、180、185℃时,管材的挤出压力和速度的均匀性达到最佳水平。对挤出工艺的加工温度进行优化设置后,生产的管材拉伸屈服强度为49.6 MPa、断裂伸长率为85.7%,环刚度为9.47 kN/m^(2),较优化前性能分别提高了46.7%、22.6%和20.5%。
According to the viscosity-temperature characteristics of polyvinyl chloride(PVC)mixture,the non-isothermal extrusion process of 500 mm diameter rigid polyvinyl chloride(PVC-U)axial-hollow wall pipe was numerically simulated.The influence of temperature on the pipe extrusion process was studied,and the extrusion process of PVC-U axial hollow wall pipe was optimized.The results show that the temperature gradient has significant influence on the extrusion speed of pipes,while the temperature has no effect on that of the pressure drop.The uniformity of extrusion pressure and speed of the pipe has achieve the best while the confluence section,expansion section,compression section,molding section and outlet section has reached the temperature of 165,170,175,180 and 185℃,respectively.After optimizing the processing temperature of the extrusion process,the yield strength,elongation at break,and ring stiffness of the produced pipes are 49.6 MPa,85.7%,and 9.47 kN/m^(2),which represents an improvement of 46.7%,22.6%,and 20.5%,respectively,comparing to the properties before optimization.
作者
郭泽元
胡少伟
金文粲
潘福渠
叶宇霄
GUO Zeyuan;HU Shaowei;JIN Wencan;PAN Fuqu;YE Yuxiao(School of Civil Engineering and Architecture,Guangxi University,Nanning 530000,China;Yellow River Laboratory,Zhengzhou University,Zhengzhou 450000,China;Dongxin Plastic Technology Co.,Ltd.,Liaocheng 252000,China;College of Mechanics and Materials,Hohai University,Nanjing 210009,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2023年第9期94-101,共8页
China Plastics Industry
基金
重庆市自然科学基金创新群体科学基金项目(cstc2020jcyj-cxttX0003)
重庆市技术创新与应用发展专项重点项目(cstc2019jscx-gksbX0013)
国家自然科学基金重点项目(52130901)
重庆大学项目(H20210292)。
关键词
硬聚氯乙烯管材
挤出工艺优化
数值模拟
黏度-温度特征
Unplasticized Polyvinyl Chloride
Optimization of Extrusion Process
Numerical Simulation
Viscosity-Temperature Characteristic
作者简介
郭泽元,男,1997年生,硕士研究生,主要从事硬聚氯乙烯管道力学模拟研究。wh18062003317@163.com;通信作者:胡少伟,男,1969年生,教授,博导,主要从事混凝土结构与组合结构研究与工程应用。hushaowei@zzu.edu.cn。
