EPDM-g-MAH对PP膨胀阻燃材料性能的影响

Effect of maleic anhydride grafted EPDM on properties of intumescent flame retardant PP materials

采用氮磷膨胀型阻燃剂制备了无卤阻燃聚丙烯(PP)材料,研究了马来酸酐(MAH)接枝三元乙丙橡胶(EPDM)(EPDM-g-MAH)对PP无卤阻燃材料性能的影响。结果表明:加入EPDM-g-MAH可提高阻燃剂和PP基体间的界面作用,降低试样在燃烧过程中的熔融滴落现象,且加入EPDM-g-MAH提高了阻燃PP的力学性能。此外,加入EPDM-g-MAH可提高PP无卤阻燃材料在高温(600～800℃)下的炭层热稳定性以及材料的最大热分解速率,但会降低材料的最大热分解温度。因此,少量的EPDM-g-MAH可以提高PP无卤阻燃材料的极限氧指数(LOI),但当w(EPDM-g-MAH)超过10%时,PP无卤阻燃材料的LOI下降,阻燃性能降低。

The authors prepared halogen-free flame retardant polypropylene （PP） by introducing intumescent flame retardant made from nitrogen phosphorus compound, and studied the effect of content of maleic anhydride grafted ethylene propylene diene monomer（EPDM-g-MAH） on properties of the PP materials. The results show that adding EPDM-g-MAH can enhance interracial interaction between PP matrix and the flame retardant, reduce melt dripping of the specimens during combustion process and improve mechanical properties of the PP materials. The addition of EPDM-g-MAH can raise thermal stability of the carbon layer at high temperature （600-800 ~C） and the maximum thermal decomposition rate but lowers the maximum thermal decomposition temperature of the PP materials. As a result, adding a small quantity of EPDM-g-MAH can make the limited oxygen index （LOI） of the PP materials augment. However, the LOI decreases and the flame retardancy of the PP material declines when the mass content of EPDM-g-MAH exceeds 10%.