三氧化钼对无卤阻燃复合酚醛泡沫体系性能的影响

Effect of Molybdenum Trioxide on Flame Retardant Properties of Phenolic Foams Halogen-free System

以多聚磷酸铵、季戊四醇、三氧化钼(Mo O3)组成无卤协同阻燃体系,研究了Mo O3不同添加量对阻燃体系复合酚醛泡沫的热释放性能、发烟性能及力学性能等的影响。研究结果表明:与纯酚醛泡沫相比,阻燃体系复合酚醛泡沫的极限氧指数(ILO)均值升高了约73%;900℃时的残炭量在Mo O3添加量≤1.5%时略有增加,而后有所降低;热释放速率(HRR)、总热释放量(THR)、氧气消耗量(O2C)、一氧化碳(COP)和二氧化碳产量(CO2P)的均值分别降低了约75%、68%、68%、28%和41%,总烟释放(TSR)均值上升了约72%;从比消光面积(SEA)显著升高和有效燃烧热(EHC)显著降低可知,阻燃体系符合气相阻燃的机理;复合酚醛泡沫的弯曲和压缩强度均值分别降低了约29%和19%。综合分析可知,Mo O3添加量为1.5%时,阻燃体系复合酚醛泡沫的综合性能最优。

Halogen-free synergistic flame retardant system was composed of ammonium polyphosphate,pentaerythritol and molybdenum trioxide.The influences of the amount of Mo O3 on properties of flame retardant system composite phendic foans（FRSCPFS） including heat release,smoke release and mechanical properties,etc,were investigated.The results showed that compared with pure phenolic foam,average limit oxygen index（ILO） of FRSCPFs increased around 73%.The residual carbon（900 ℃） increased slightly when Mo O3 amount ≤ 1.5%,and then decreased.Heat release rate（HRR）,total heat release（THR）,oxygen consumption（O2C）,and production of carbon monoxide and carbon dioxide（COP and CO2P） reduced about75%,68%,68%,28% and 41%,respectively.Average total smoke release（TSR） increased about 72%.Average rate of heat emission（ARHE） decreased slightly when Mo O3 amount ≤1.5% and then increased.The flame retardant system was proved that flame retardant mainly played a role in the gas phase and agreed with the gas phase flame retarding mechanism by the increase of specific extinction area（SEA） and by the effect heat of combustion（EHC）.Average bending and compression strength reduced about 29% and 19%,respectively.By comprehensively comparing various performances,the properties of FRSCPFs were best when the amount of Mo O3 was 1.5%.