MoO3在聚烯烃/MH-EG阻燃体系中的协效作用研究  

Study on Synergistic Effect of MoO3 in Polyolefin/MH-EG Flame Retardant System

作　　者：李杰康 徐路平 徐建中[1] 谢吉星[1] Li Jiekang;Xu Luping;Xu Jianzhong;Xie Jixing(College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China)

机构地区：[1]河北大学化学与环境科学学院

出　　处：《塑料科技》2019年第7期116-120,共5页Plastics Science and Technology

摘　　要：以氢氧化镁(MH)和可膨胀石墨(EG)为阻燃剂制备了阻燃聚烯烃(PO)材料,研究了三氧化钼(MoO3)在该体系中的阻燃协效作用。结果表明:当MH添加量为40%时,阻燃PO的极限氧指数(LOI)仅为24.4%,继续加入6phr EG后,阻燃PO的LOI提高至28.2%,但不能提升材料的垂直燃烧等级。在PO/MH-EG体系中加入1 phr MoO3后,材料的LOI达到29.5%,并通过UL 94V-0测试。此外,热重分析(TGA)和锥形量热(Cone)数据显示,MoO3的加入可以促使材料提前交联成炭,提高材料的残炭率。与PO/MH-EG体系相比,PO/MH-EG-MoO3阻燃材料的热释放速率峰值(PHRR)和烟释放速率峰值(PSPR)分别降低了40.98%和56.76%。Magnesium hydroxide(MH) and expandable graphite(EG) were used to prepare the flame retardant polyolefin(PO), and the flame-retardant synergistic effect of molybdenum trioxide(MoO3) in this system was studied. The results show that when the MH content is 40%, the limit oxygen index(LOI) of the flame retardant PO is only 24.4%. After adding 6 phr EG, the LOI of the PO/MH-EG system is increased to 28.2%, but the rating of vertical burning test of the material has no increase. When 1 phr MoO3 is added to the PO/MH-EG system, the LOI of the material reaches 29.5% and passes the UL 94 V-0 test. Moreover, thermogravimetric analysis and Cone data show that the addition of MoO3 can accelerate the cross linking and improve the yield of residual char, compared with PO/MH-EG system, the peak of heat release rate(PHRR) and the peak of smoke release rate of PO/MH-EG-MoO3 system decrease by 40.98% and 56.76%, respectively.

关 键 词：三氧化钼 氢氧化镁 可膨胀石墨 聚烯烃 阻燃 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]