Zhou Ru, Ming Zhuang, He Jiapeng, Ding Yanming, Jiang Juncheng
Jiangsu Key Laboratory of Urban and Industrial Safety, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
College of Urban Construction, Nanjing Tech University, Nanjing 211816, China.
Polymers (Basel). 2020 Jan 9;12(1):180. doi: 10.3390/polym12010180.
In this study, paraffin was selected as the phase change material (PCM) and high-density polyethylene (HDPE) as the supporting material to prepare a flame-retardant PCM system. The system consisted of paraffin, HDPE, expanded graphite (EG), magnesium hydroxide (MH) and aluminum hydroxide (ATH). The thermal stability and flame retardancy were studied by thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM) and cone calorimeter test (CONE). The SEM proved that the addition of MH and ATH can produce an oxide film on the surface of the composite material and form a "physical barrier" with the char layer, generated by the expansion of EG, preventing the transfer of heat and oxygen. The TGA test showed that, compared with other flame-retardant systems, the materials with added MH and ATH have a higher thermal stability and carbonization ability, and the amount of char residue has increased from 17.6% to 32.9%, which reduces the fire risk of the material. The flame retardant effect is obvious. In addition, the addition of MH and ATH has no significant effect on the phase transition temperature and latent heat value of PCMs. The CONE data further confirmed that MH and ATH can work with EG to prevent heat release, reduce the total heat release rate (THR) value and effectively suppress the generation of smoke, CO and CO. The peak heat release rate (PHRR) value also decreased, from 1570.2 kW/m to 655.9 kW/m.
在本研究中，选择石蜡作为相变材料（PCM），高密度聚乙烯（HDPE）作为支撑材料，制备了一种阻燃PCM体系。该体系由石蜡、HDPE、膨胀石墨（EG）、氢氧化镁（MH）和氢氧化铝（ATH）组成。通过热重分析（TGA）、扫描电子显微镜（SEM）和锥形量热仪测试（CONE）研究了其热稳定性和阻燃性。SEM证明，添加MH和ATH可在复合材料表面产生氧化膜，并与EG膨胀产生的炭层形成“物理屏障”，阻止热量和氧气的传递。TGA测试表明，与其他阻燃体系相比，添加MH和ATH的材料具有更高的热稳定性和碳化能力，残炭量从17.6%增加到32.9%，降低了材料的火灾风险。阻燃效果明显。此外，添加MH和ATH对PCM的相变温度和潜热值没有显著影响。CONE数据进一步证实，MH和ATH可与EG协同作用，防止热量释放，降低总热释放速率（THR）值，并有效抑制烟雾、CO和CO的产生。峰值热释放速率（PHRR）值也从1570.2kW/m²降至655.9kW/m²。
