Xi Wang, Qian Lijun, Li Linjie
Shandong Key Laboratory of Marine Fine Chemicals, Shandong Ocean Chemical Industry Scientific Research Institute, Weifang 262737, China.
School of Materials Science & Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China.
Polymers (Basel). 2019 Jan 24;11(2):207. doi: 10.3390/polym11020207.
In order to explore flame retardant systems with higher efficiency in rigid polyurethane foams (RPUFs), aluminum hydroxide (ATH), [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester (BH) and expandable graphite (EG) were employed in RPUF for constructing ternary synergistic flame retardant systems. Compared with binary BH/EG systems and aluminum oxide (AO)/BH/EG, ATH/BH/EG with the same fractions in RPUFs demonstrated an increase in the limited oxygen index value, a decreased peak value of heat release rate, and a decreased mass loss rate. In particular, it inhibited smoke release. During combustion, ATH in ternary systems decomposed and released water, which captured the phosphorus-containing products from pyrolyzed BH to generate polyphosphate. The polyphosphate combined with AO from ATH and the expanded char layer from EG, forming a char layer with a better barrier effect. In ternary systems, ATH, BH, and EG can work together to generate an excellent condensed-phase synergistic flame retardant effect.
为了探索在硬质聚氨酯泡沫（RPUF）中具有更高效率的阻燃体系，将氢氧化铝（ATH）、[双（2-羟乙基）氨基]甲基膦酸二甲酯（BH）和可膨胀石墨（EG）用于RPUF中以构建三元协同阻燃体系。与二元BH/EG体系以及氧化铝（AO）/BH/EG相比，在RPUF中具有相同比例的ATH/BH/EG表现出极限氧指数值增加、热释放速率峰值降低以及质量损失率降低。特别地，它抑制了烟雾释放。在燃烧过程中，三元体系中的ATH分解并释放出水，水捕获了热解BH产生的含磷产物以生成聚磷酸盐。聚磷酸盐与ATH中的AO以及EG形成的膨胀炭层结合，形成具有更好阻隔效果的炭层。在三元体系中，ATH、BH和EG可以协同作用以产生优异的凝聚相协同阻燃效果。
