聚合物振动诱导单螺杆熔融塑化过程(Ⅰ) 熔融机理及熔融速率  

Melting and plasticizing process of vibration induce single-screw extruder (Ⅰ) Melting mechanism and melting rate

作　　者：瞿金平[1] 曾广胜[1] 何和智[1] 晋刚[1] 曹贤武[1] 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程研究中心,广东广州510640

出　　处：《化工学报》2006年第2期414-423,共10页CIESC Journal

基　　金：国家自然科学基金项目(20074010;10472034;10590351).~~

摘　　要：在振动诱导单螺杆挤出机中,通过螺杆的轴向振动使聚合物的熔融塑化过程在周期性的振动状态下进行,而经典熔融塑化理论无法描述处于周期性振动状态的熔融塑化过程。通过可视化和剖分料筒实验,观察了振动诱导单螺杆挤出机的熔融过程,深入分析了振动诱导熔融机理,建立了熔融过程动态物理模型,提出了振动场作用下熔融过程的质量平衡方程、动量平衡方程、能量平衡方程及本构方程,并运用复杂的数学方法求得近似解析解,最后得到了熔融速率方程和熔膜厚度方程,从公式中可以看出熔融速率与熔膜厚度都是与振动参数相关的,且具有时间依赖性,振动场的引入可以加快熔融速率,减少熔膜厚度。理论研究与前面的实验结果符合得很好.With the use of vibration field along the screw axial direction, the melting and plasticizing process of vibration induced single-screw extruder varied periodically and the change of polymer viscoelasticity was non-linear, which could not be described by the classical melting theory. The dynamic transparent barrel visualization experimental method and the static half- open barrel visualization experimental method were adopted to investigate the influence of vibration parameters on the melting and plasticizing process. Melting mechanism was analyzed, and the melting physical model was established. Mass balance equation, momentum balance equation, energy balance equation and constitutive equation of the melting process with vibration were presented. With the help of sophisticated mathematical deduction, equations of melting rate and thickness of melt film were obtained. Melting rate and thickness of melt film was related to vibration parameters and was time dependent. Melting rate increased while thickness of melt film decreased by vibration. Calculation were in good agreement with the result of experiment.

关 键 词：挤出机 熔融 聚合物 振动 

分 类 号：O321[理学—一般力学与力学基础] TQ320.1[理学—力学]