超临界二氧化碳/聚苯乙烯挤出发泡的单相溶液

为得到微孔发泡塑料,对影响挤出发泡中超临界二氧化碳/聚苯乙烯(SCCO2/PS)单相溶液形成的因素进行了研究,分析了挤出机进气点位置、螺杆结构及系统温度和压力等因素对单相溶液的影响.实验表明:轴向进气点位置对进气的稳定性影响很大,径向圆周上的多点进气和较低的气体温度有利于优质单相溶液的形成;螺杆转速的增加将降低单相溶液的品质;输送过程中较高压力和较低温度有利于保证单相溶液品质.文中还给出了获得优质二氧化碳/聚苯乙烯连续挤出发泡单相溶液的理想条件.

Investigation into Supercritical CO2/Polystyrene Single-Phase Solution in Extrusion Foaming

In order to obtain microcellular plastic,the factors that affect the formation of supercritical dioxide/polystyrene single-phase solution in extrusion foaming were investigated.The effects of the position of gas injection,the screw structure,the system temperature and pressure on the single-phase solution were then discussed.Experimental results indicate that(1) the position of gas injection in the axial direction seriously affects the stability of gas injection,(2) more ports in the radial direction and low gas temperature help to form high-quality single-phase solution,(3) the quality of the single-phase solution decrease with the increase in the rotational speed of screw,and (4) higher pressure and lower temperature of the solution is helpful to the ensurence of single-phase solution pro-duct quality.Also,the ideal conditions for the formation of high-quality single-phase solution of supercritical di-oxide/polystyrene in extrusion foaming were presented in this paper.