The Study Of Metal Oxide Of APP/PER/MA/PP Flame Retardant System Performance Impact

APP-PER-MA intumescent flame retardant systems used in polypropylene (PP) have good effect of flame retardant. Synergetic agent can improve the effect of flame retardant agent and reduce the dosage of flame retardants, so the study of synergetic agent for intumescent flame-retardant system is becoming a main topic in current researches. Metal oxide (MO) has synergistic effects to flame retardant systems of APP-PER-MA (IFR) and the relative reports are more and more. However, these researches are scattered, no systematic, general rules are difficult to find. On the same conditions, to study the synergy of the different metal oxide to APP-PER-MA flame retardant systems, looking for their common law of effect is of great significance to the development and application of expansion flame retardant systems.In this paper, five kinds of metal oxides (Fe2O3, MnO2, CuO, ZnO and Ce2O3), respectively, been added in the IFR flame retardant systems are called association effect of flame retardants, each of their quality percentage relatively to the IFR flame retardant system were0%,2%,4%,6%,8%,10%. And then, which were made of flame retardant PP samples, with the ratio of3:7of the quality percentage of the association effect of flame retardants and the pure PP. After limit oxygen index and vertical combustion experiment using the above samples, it finds that:(1) to join the2%-6%quality percentage’s metal oxide (relative to IFR) can improve the IFR’s flame retardant effect of to PP, to join the metal oxide of which its quality percentage is more than8%contrarily reduce the effect;(2) flame retardant pp samples which were joined with the quality percentage of2%metal oxides can make better effect. By the thermogravimetric analysis experiment of association effect of flame retardants of which Metal oxide additives relative quality percentage is2%, it founds that Ce2O3promoted the IFR into charcoal, significantly increased the amount of carbon residue; MnO2and CuO have little impact on carbon, their association effect are not obvious; Fe2O3and ZnO shorten the IFR expansion into carbon process, decrease the carbon residue after IFR pyrolysis. Thermogravimetric analysis of association effect of flame retardants of which Metal oxide additives relative quality percentage is2%, and calculation of their activation energy found that Ce2O3and CuO improve the IFR flame retardant PP thermal degradation activation energy, while MnO2has not much effect, and ZnO reduces the activation energy of IFR flame retardant PP thermal degradation.Determine the phosphorus content after Ce2O3-IFR-PP thermal degradation found that Ce2O3added2%can achieve very good association effect of flame retardant, much more additions will cause a loss of phosphorus of expansion flame retardant systems and damage the expansion flame retardant systems. By scanning electron microscopy analysis and energy spectrum analysis on C, O, N, P, Ce elements contents of the carbon layer of Ce2O3, relative to IFR quality percentage is2%of flame retardant PP, which was Under the different temperature of thermal degradation, it concludes possible mechanism of degradation of Ce2O3synergistic effects IFR-PP flame retardant that:adding Ce2O3can catalyze APP crosslink and form three-dimensional network structure. This structure can stabilize the APP and reduce the loss of the compounds containing phosphorus, at the same-time, proper three-dimensional structure will make carbon layer structure more closely and stable. But when adding excessive Ce2O3into IFR-PP system, which can lead to extravagant APP crosslink and becoming APP gel form. So that it will not be able to participate in inflating the formation of intumescent carbon, lead to intumescent flame retardant system was damaged.