超临界流体微孔发泡注塑精确注气的探究  

Exploration of gas precise injection in the process of microcellular foam injection with SCF

作　　者：李亦哲[1] 闫宝瑞[1] 段涛[1] 信春玲[1] 何亚东[1,2] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]北京化工大学教育部高分子材料加工装备工程研究中心,北京100029

出　　处：《北京化工大学学报（自然科学版）》2016年第4期96-101,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：超临界流体注入量直接影响着微孔发泡注塑成型制品中微泡孔的结构与数量,进而影响制品的力学性能。通过设计相关实验发现:微孔发泡注塑成型注气过程分为气涌与稳定流动两个阶段,且气涌量的大小主要与注气系统的硬件结构有关,在改进硬件结构后气涌量有较大程度的削减;稳定流动阶段的气流量则与相关注气参数有关。为了验证这一结果,通过实验定量研究了超临界流体注气量与注气压差、限流元件孔径、注气时间、硬件结构之间的关系,得到了调节注气量的传递函数,该函数模型可以为实际生产中根据减重需求调节注气系统的一系列工艺参数提供依据。The gas injected amount of supercritical fluid（ SCF） affects the number and the structure of micro bubbles and thus affects the mechanical properties of products. There are two phases in the gas injection process. The quantity of gas surge is related to the hardware structure and can be reduced significantly when the structure is improved. The quantity of gas flowing in the steady stage is related to the gas injection parameters. In this work we have studied the relationships between the amount of gas injected,the gas injection pressure,the aperture of the current limiting element,the gas injection time and the hardware structure. These relationships provide a basis for adjusting the process parameters.

关 键 词：微孔发泡注塑 超临界流体(SCF) 气涌 限流元件 注气 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]