Modern day energy codes are driving the design and multi-layered configuration of exterior wall systems with a significant emphasis on achieving high performance insulation towards improving energy performance of building envelopes. Use of highly insulating polyisocyanurate (PIR) based materials enhanced with eco-friendly lamellar inorganic fillers reinforces energy performance requirements, environmental challenges and cost reduction without compromising the overall building fire safety. The current work assessed the fire behaviour of PIR modified with three layered fillers, namely MgAlCO 3 (PIR-LDH1), MgAl Stearate (PIR-LDH2) and Zirconium Phosphate octadecylamine (PIR-ZrP3). For each of the fillers, three loadings (2, 4 and 6% by weight) were used. Optical analysis by X-ray diffraction patterns (XRD), cone calorimeter (CC), thermogravimetric (TGA) analysis, post-burning morphological evaluation using field emission scanning electron microscope (FESEM) and diffuse reflectance infrared spectroscopy (DRIFT) analysis, were performed. The results indicated that fire reaction properties and thermal stability of foam samples were enhanced with all three different lamellar inorganic smart fillers. The initial degradation temperature of PIR-layered filler samples was increased, demonstrating that incorporation of flame retardants decelerated the degradation of the PIR foam and contributed to significant char formation, from 19.5% in pure PIR samples to 33% in PIR-6%LDH1 samples. Increasing the filler content also resulted in improved char properties and decreased peak Heat Release Rates (HRR) in the cone calorimeter. Due to the development of a stable char layer, samples containing 6% of ZrP3 did not ignite at 20 kW/m 2 and a reduction of up to 40% in the peak HRR was achieved in PIR-2%ZrP3 samples.

中文翻译：

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层状双氢氧化物和磷酸锆纳米复合填料在聚异氰脲酸酯泡沫中的阻燃作用

现代能源规范正在推动外墙系统的设计和多层配置，重点强调实现高性能绝缘以提高建筑围护结构的能源性能。使用高度绝缘的聚异氰脲酸酯 (PIR) 基材料，并添加环保层状无机填料增强了能源性能要求、环境挑战和成本降低，同时不影响整体建筑防火安全。目前的工作评估了用三层填料改性的 PIR 的防火性能，即 MgAlCO 3 (PIR-LDH1)、硬脂酸镁铝 (PIR-LDH2) 和磷酸锆十八胺 (PIR-ZrP3)。对于每种填料，使用三种负载量（2、4 和 6 重量%）。通过 X 射线衍射图 (XRD)、锥形量热仪 (CC)、进行了热重 (TGA) 分析、使用场发射扫描电子显微镜 (FESEM) 和漫反射红外光谱 (DRIFT) 分析的燃烧后形态评估。结果表明，三种不同的层状无机智能填料均增强了泡沫样品的火灾反应性能和热稳定性。PIR 层状填料样品的初始降解温度升高，表明阻燃剂的加入减缓了 PIR 泡沫的降解并导致显着的炭化，从纯 PIR 样品中的 19.5% 到 PIR-6%LDH1 样品中的 33% . 增加填料含量还导致锥形量热计中炭特性的改善和峰值热释放速率 (HRR) 的降低。由于稳定的炭层的发展，