新型膨胀阻燃聚丙烯结构与性能研究

Study on Structure and Properties of Novol Intumescent Flame Retardant Polypropylene

采用多聚磷酸蜜胺(MPP)和笼状季戊四醇磷酸酯(PEPA)复配阻燃剂,制备了具有良好阻燃性能的膨胀阻燃聚丙烯(PP)。研究了MPP/PEPA质量比和Cr2O3用量对PP阻燃和力学性能的影响。结果表明,MPP/PEPA质量比为3∶2时,复配效果最好;添加少量的Cr2O3即可显著提高材料的阻燃性能。当MPP,PEPA,Cr2O3添加质量分数分别为12%,8%和2%时,阻燃PP的氧指数高达31.5%,且具有较好的力学性能。热失重(TGA)、扫描电镜(SEM)和Kissinger动力学分析表明添加Cr2O3可催化MPP/PEPA间的酯化反应,促进材料成炭,减缓材料的热降解速率,提高材料隔热、隔氧能力。

Intumescent retardant polypropylene （PP） was prepared by using melamine polyphosphate （MPP） and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phospha-bicyclo[2. 2.2] octane （PEPA） as flame retardants. The effects of mass ratio of MPP/PEPA and Cr2Oa con- tent on flame retardaney and mechanical properties of PP were studied. The results show that MPP and PEPA have excellent synergistic effects on the flame retardant PP when the mass ratio of MPP and PEPA was 3 ： 2,a little quantity of Cr2O3 can improve the flame retardancy of PP remarkably. When the mass fractions of MPP, PEPA and Cr203 were 12%, 8% and 2% respectively, the LOI of flame retardant PP was 31.5%, and it has good mechanical properties. TGA, SEM and Kissinger kinetics analysis results show that Cr2O3 can catalyze esterification between MPP and PEPA, and increase the char residue, slow the thermal degradation rate, improve flame retardancy.