阻燃剂对聚苯乙烯挤出发泡性能的影响

Influence of flame retardants on the extrusion foaming of polystyrene

利用超临界二氧化碳挤出发泡法制备了聚苯乙烯(PS)挤塑板,研究了新型复合阻燃剂(FR)的添加量对PS/FR体系流变特性的影响,表征测试了发泡材料的微观泡孔结构,并与国产阻燃剂(DFR)进行了比较,同时比较了不同FR添加量下发泡制品的阻燃性能。研究结果表明,FR的添加会降低树脂的黏度;在FR质量分数为3.5%时,发泡制品的表观密度和平均泡孔直径最小,泡孔密度最大,开孔率较低,同时制品的阻燃性能较好。

Extruded polystyrene （PS） foam board was prepared by extrusion foaming with supercritical carbon diox- ide as a blowing agent. The influence of the content of a new flame retardant （FR） compound on the rheological properties of the PS/FR system were investigated, and then the microcellular morphologies of foams were character- ized and measured. The results were compared with those obtained using a domestic flame retardant （DFR）. The flame resistance of foams with different FR contents was also compared. The results indicate that the addition of FR causes a reduction in the viscosity of the resin. The apparent density and mean cell diameter reach their minimum, and the cell density reaches its maximum when the mass fraction of FR is 3.5%. The resulting foam has a low open cell content and exhibits good flame resistance.