Continuous microcellular polystyrene foam extrusion with supercritical CO2
Continuous microcellular polystyrene foam extrusion with supercritical CO2
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DOI：
10.1002/pen.11100
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发表时间：
2002-11
影响因子：
3.2
通讯作者：
Xiangmin Han;K. Koelling;D. Tomasko;L. J. Lee
中科院分区：
文献类型：
--
作者：
Xiangmin Han;K. Koelling;D. Tomasko;L. J. Lee
在双级单螺杆挤出机上实现了聚苯乙烯微孔泡沫塑料的超临界CO2连续生产。采用Sanchez-Lacombe状态方程模拟相平衡，结合运动方程、能量平衡方程和Carreau粘度模型，对口模内的流场和压力分布进行了模拟。通过计算流体动力学代码（FLUENT）从模拟结果确定模具中的成核位置。根据玻璃化转变温度和相平衡选择实验参数。探讨了CO2浓度和口模压力对挤出过程的影响.在溶解度极限以下，较高的CO2浓度导致较小的泡孔尺寸和较大的泡孔密度.随着模头压力的增加，泡孔尺寸减小，泡孔密度增加。
The continuous production of polystyrene microcellular foams with supercritical CO 2 was achieved on a two-stage single-screw extruder. Simulations related to the foaming process were accomplished by modeling the phase equilibria with the Sanchez-Lacombe equation of state and combining the equations of motion, the energy balance, and the Carreau viscosity model to characterize the flow field and pressure distribution in the die. The position of nucleation in the die was determined from the simulation results via a computational fluid dynamics code (FLUENT). Experimental parameters were selected according to the T g and phase equilibria. The effects of CO 2 concentration and die pressure are explored. Below the solubility limit, higher CO 2 concentrations lead to smaller cell size and greater cell density. With an increase of die pressure, the cell size decreases and the cell density increases.