组合发泡剂对聚苯乙烯发泡行为的影响研究

Effects of Compound Foaming Agents on Foaming Behavior of Polystyrene

采用物理发泡剂和化学发泡剂的组合发泡剂对聚苯乙烯(PS)在串联挤出发泡机组中进行连续挤出发泡,探讨了不同含量发泡剂和不同发泡温度对PS发泡行为的影响。通过真密度测定仪和扫描电子显微镜对发泡制品的密度、发泡倍率和泡孔形态进行测试。研究结果表明,采用组合复合发泡剂后,PS发泡制品的泡孔密度明显提高,发泡倍率增加,泡体结构优于单独使用物理发泡剂或化学发泡剂的发泡制品。在发泡温度为120℃,CO2注气量为5 mL/min,化学发泡剂用量为3份,SiO2用量为1份时,样品具有最佳泡孔形态,发泡倍率为18.42,泡孔密度为3.53×106个/cm3。

Foaming extrusion of polystyrene（PS） was processed using the combination of physical and chemical foaming agents on the single-single screw extruder tandem extrusion line.The effects of foaming agents and foaming temperature on the foaming behaviors of PS were discussed.The foam density and foam morphology of PS were tested by densitometer and scanning electron microscopy.The results show that the cell density and expansion ratio of samples increase, and the cell morphology of PS improves effectively using compound foaming agents, compared with the foaming products produced by physical or chemical foaming agent alone. From the experiment data, when the forming temperature is 120 ℃, CO2 volume flow rate is 5 mL/min, chemical agent content is 3%, and SiO2 content is 1%, PS form has optimal cell morphology, whose expansion ratio and cell density of sample is 18.42 and 3.53 × 106 cells / cm3, respectively.