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首页> 外文期刊>Journal of Applied Polymer Science >Addition flame-retardant effect of nonreactive phosphonate and expandable graphite in rigid polyurethane foams
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Addition flame-retardant effect of nonreactive phosphonate and expandable graphite in rigid polyurethane foams

机译：在刚性聚氨酯泡沫中添加非反应性膦酸酯和可膨胀石墨的添加阻燃效果

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摘要

A series of flame-retardant rigid polyurethane foams (RPUFs) containing nonreactive phosphonate (5-ethyl-2-methyl-1,3,2-dioxaphosphorinan-5-yl) methyl dimethyl phosphonate P-oxide (EMD) and expandable graphite (EG) were prepared by water blown. The flame-retardant properties and mechanism of EMD/EG on RPUFs were systematically investigated. The EMD/EG system effectively increased the limiting oxygen index (LOI) value and decreased the values of total heat release (THR), av-effective heat of combustion (EHC), pk-heat release rate (HRR), total smoke release (TSR) of RPUFs. The impact values of LOI, THR, and av-EHC resulted by EMD/EG system are nearly equal to the sum of the impact values by EMD and EG individually in RPUFs, which implies the addition flame-retardant effect from EMD and EG. EMD alone exerted excellent gas-phase flame-retardant effect by releasing PO fragments with quenching effect. The firm residue produced by EMD combined well with the loose and worm-like expanded graphite from EG further to form compact and expanded char layer, which brought excellent barrier effect and filtration effect to matrix. That's why pk-HRR and TSR values of RPUF reduced. Depending on the simultaneous actions of EMD/EG system in gas phase and condensed phase during combustion, the flame-retardant effects from nonreactive phosphonate and EG on RPUFs were added together. (C) 2017 Wiley Periodicals, Inc.
机译：含有非反应性膦酸盐（5-乙基-2-甲基-1,3,2-二恶磷酸磷-5-Y1）甲基二甲基膦酸磷酸（EMD）和可膨胀石墨（EMD）和可膨胀石墨（例如）的一系列阻燃刚性聚氨酯泡沫（RPUF）（例如）通过吹水制备。系统地研究了EMD /例如RPUFS上的阻燃性和机制。 EMD /例如系统有效地增加了限制氧指数（LOI）值，并降低了总热释放（THR），燃烧（EHC），PK - 热释放率（HRR），总烟雾释放（ RPUFS的TSR。由EMD /例如系统产生的LOI，TROR和AV-EHC的冲击值几乎等于EMD和例如单独在RPUF中的撞击值之和，这意味着来自EMD的添加阻燃效果和例如。通过释放淬火效果释放PO片段，EMD独自施加出色的气相阻燃效果。通过EMD产生的刚性残留物与松散和蠕虫的膨胀石墨孔合并，从例如进一步形成紧凑且膨胀的炭层，这为基质带来了优异的屏障效应和过滤效果。这就是为什么PK-HRR和RPUF的TSR值减少。根据EMD /例如系统在燃烧期间的气相和浓缩相的同时效应，将来自非反应性膦酸盐和例如RPUF的阻燃效应加入。 （c）2017 Wiley期刊，Inc。

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