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Laponite-based inorganic-organic hybrid coating to reduce fire risk of flexible polyurethane foams
Applied Clay Science ( IF 5.6 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.clay.2020.105525
Hafezeh Nabipour , Xin Wang , Lei Song , Yuan Hu

Abstract Flexible polyurethane (FPU) foam as a primary softening material is utilized in soft furnishings of upholstered mattresses and furniture. High flammability of this soft furnishing material usually leads to residential fires, causing severe fatalities. In the present study, we proposed a bio-based and environmentally-friendly flame retardant multilayered coating consisted of laponite (LAP), branched polyethyleneimine (BPEI), sodium alginate (SA) and chitosan (CH) that was deposited onto FPU foams to enhance their fire safety property. Based on the thermogravimetric analysis results, it was indicated that after the deposition of LAP, the thermal stability of the coated FPU foams increased sharply. Foam treated with 9 quad layers (QL) of BPEI/SA/CH/LAP multilayered coating showed self-extinguishing behavior in an open flame burning test. Furthermore, the values of peak heat release rate (PHRR), total heat release (THR) and smoke release rate (SPR) of the coated FPU foams reduced considerably in comparison to those of the pure FPU foam. Specifically, 9 QLs of BPEI/SA/CH/LAP declined the PHRR and the THR by 74% and 42.6%, respectively. The coated FPU foam also showed self-extinguishing and anti-dripping features in an open flame testing. Therefore, it can be stated that LAP-based coating has incredible benefits in decreasing fire risk of FPU foams. Moreover, the flame retardant mechanism of this LAP-based multilayered coating was proposed. The LAP-based coating functioned as a physical insulating barrier that successfully retarded the permeation of the flammable volatiles, heat and oxygen. Hence, the significant decrease in PHRR with the self-extinguishing behavior was achieved, implying promising potential of this LAP-based multilayered coating to enhance the fire safety of FPU foams.

中文翻译:

基于合成锂皂石的无机-有机混合涂料,可降低软质聚氨酯泡沫的火灾风险

摘要 软质聚氨酯 (FPU) 泡沫作为主要柔软材料用于软垫床垫和家具的软装饰。这种软装饰材料的高度易燃性通常会导致住宅火灾,造成严重的人员伤亡。在本研究中,我们提出了一种由合成锂皂石 (LAP)、支化聚乙烯亚胺 (BPEI)、海藻酸钠 (SA) 和壳聚糖 (CH) 组成的生物基环保阻燃多层涂层,沉积在 FPU 泡沫上以增强他们的消防安全财产。热重分析结果表明,LAP沉积后,涂层FPU泡沫的热稳定性急剧增加。用 BPEI/SA/CH/LAP 多层涂层的 9 四层 (QL) 处理的泡沫在明火燃烧试验中表现出自熄性。此外,与纯 FPU 泡沫相比,涂层 FPU 泡沫的峰值热释放率 (PHRR)、总热释放 (THR) 和烟雾释放率 (SPR) 值显着降低。具体而言,BPEI/SA/CH/LAP 的 9 个 QL 使 PHRR 和 THR 分别下降了 74% 和 42.6%。在明火测试中,涂覆的 FPU 泡沫还显示出自熄和抗滴落的特性。因此,可以说基于 LAP 的涂层在降低 FPU 泡沫的火灾风险方面具有令人难以置信的优势。此外,还提出了这种基于 LAP 的多层涂层的阻燃机制。基于 LAP 的涂层起到了物理绝缘屏障的作用,成功地阻止了易燃挥发物、热量和氧气的渗透。因此,实现了具有自熄性的 PHRR 显着降低,
更新日期:2020-05-01
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