CaCO3和EG与APP／PER／ZB体系协同阻燃交联EVAC基复合材料的研究  

Synergistic Flame-Retardant Effects of CaCO_3 and EG with IFR(APP/PER/ZB System) on Crosslinking EVAC Composite

作　　者：李雅南[1] 吴新锋[1] 王立春[1] 江平开[1] 

机构地区：[1]上海交通大学化学化工学院,上海市电气绝缘与热老化重点实验室,上海200240

出　　处：《工程塑料应用》2013年第3期21-25,共5页Engineering Plastics Application

摘　　要：采用膨胀型阻燃剂[聚磷酸铵/季戊四醇/硼酸锌(APP/PER/ZB)体系]对交联乙烯–乙酸乙烯酯塑料(EVAC)进行阻燃改性,然后分别用CaCO3和可膨胀石墨(EG)进一步优化EVAC/APP/PER/ZB复合材料。采用极限氧指数(LOI)仪、锥形量热仪和扫描电子显微镜(SEM)研究了复合材料的阻燃性能及阻燃机理,并测试了复合材料的力学性能和介电性能。结果表明,随着APP/PER/ZB体系含量的增加,复合材料的LOI逐渐升高,热释放速率峰值、平均热释放速率、热释放总量逐渐降低;拉伸强度、断裂伸长率和介电常数逐渐下降,但介电损耗变化极小。CaCO3和EG优化的复合材料阻燃性能和拉伸性能均比未优化的有所提高,起到一定的协同阻燃效果,其中EG的优化效果最好;CaCO3对复合材料介电性能的影响与APP/PER/ZB体系大致相同,但高频下EG的影响较为显著,均明显降低了复合材料的介电常数和介电损耗峰值。Crosslinking ethylene-vinyl acetate plastics （EVAC） were modified with intumescent flame retardant （APP/PER/ ZB system） and CaCO3 or expanded graphite （EG） was used to further optimize EVAC/APP/PER/ZB composites. Flame-retardant properties and mechanism of the composites were investigated by means of limiting oxygen index （LOI）, cone calorimeter and SEM. Mechanical and dielectric properties of the composites were tested also. The results show that with the content of APP/ PER/ZB system increasing, peak value of heat release rate, average heat release rate and total heat release of EVAC/APP/PER/ ZB composite decrease, and LOI of the composite increases. Tensile strength, elongation at break and dielectric constant of the composite decrease, but dielectric loss changes slightly. The flame-retardant and mechanical properties of EVAC/APP/PER/ZB composites optimized by CaCO3 and EG are higher than those of unoptimized composites, which have certain synergistic effect, and the optimization effect of EG is best. The effects of CaCO3 on the dielectric properties of the composites are similar with APP/ PER/ZB system, but the effects of EG under high frequency are obvious, which decrease the dielectric constant and dielectric loss obviously.

关 键 词：乙烯-乙酸乙烯酯塑料 膨胀阻燃 协同阻燃 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]