Cr2O3对PP/MPP/PEPA膨胀阻燃体系的协同作用研究

以Cr2O3为阻燃协效剂，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无卤阻燃PP．研究了Cr2O3用量对PP阻燃性能和协同作用的影响．结果表明：添加少量的Cr2O3即可显著提高PP的阻燃性能；当MPP／PEPA／Cr2O3添加量分剐为12％、8％和2％时，阻燃PP的氧指数高达31．5．TGA、FTIR分析和体式显微镜和SEM观测结果表明：添加少量Cr2O3可以催化MPP／PEPA间的酯化反应．促进体系成炭，形成更致密的炭层．从而提高材料的阻燃性能．

Study of synergistic effect of Cr2O3 on PP/MPP/PEPA IFR system

The intutnescent flame retardant (IFR) PP was prepared by using Melamine polyphosphate (MPP) and l-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclooctane(PEPA) as flame retardants and Cr_2O_3 as synergistic agent.The effect of Cr_2 O_3 contents on flame retardancy and synergistic effect was studied.It was found that a little quantity of Cr_2O_3 could improve the flame retardance of PP remarkably;when the mass fraction of MPP,PEPA and Cr_2O_3 were 12%,8% and 2%,respectively,the LOI of flame retardant PP was 31.5.The TGA,FTIR optical micrographs,and SEM micrographs showed that a little quantity of Cr_2O_3 could catalyze esterification reaction between MPP and PEPA,and increase the char residue and form much denser char to improve the flame retardant performance of materials.