阻燃剂对喷涂聚脲弹性体阻燃性能的影响

Effect of Flame Retardant on Flame Retardancy of Spray Polyurea Elastomer

选用阻燃剂次磷酸铝(AHP)、石墨(EG)、含磷多元醇按不同用量添加到喷涂聚脲弹性体(PUA)中,采用喷涂制样的方式制备阻燃聚脲,并探究了阻燃剂的种类及用量对聚脲热稳定性能和阻燃性能的影响。结果发现:AHP和EG的引入均能提高PUA的初始热分解温度和成炭性,含磷多元醇的引入会降低初始分解温度,对成炭性影响不大;通过石墨与含磷多元醇质量比1∶1复配会降低热释放速率和总释热量,改善成炭性和抑烟效果,LOI值可提高至29.2%,可达到UL94 V-0等级,阻燃性能优异。

Flame retardants aluminum hypophosphate(AHP),graphite(EG)and phosphorous polyol were added to the spray polyurea(PUA)in different amounts,and the flame retardant polyurea samples were prepared by spraying.The effects of the type and amount of flame retardant on the thermal stability and flame retardancy of the polyurea were studied.The results showed that the introduction of AHP and EG could improve the initial thermal decomposition temperature and charring property of PUA,while the introduction of phosphorus-containing polyols could reduce the initial decomposition temperature and had little effect on charring formation.The mass ratio of graphite to phosphorus polyol 1∶1 could reduce the heat release rate and total heat release,improve the charring property and smoke suppression effect.The LOI value was increased to 29.2%.The product could reach the UL94 V-0 grade,and had excellent flame retardant performance.