Kang Furu, Tu Jiayao, Zhao Heng, Bai Zujin, Zhang Tiantian
Postdoctoral Station of Geological Resource and Geological Engineering, Xi'an University of Science and Technology (XUST), Xi'an 710054, China.
Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi'an University of Science and Technology (XUST), Xi'an 710054, China.
Polymers (Basel). 2023 Jul 1;15(13):2927. doi: 10.3390/polym15132927.
The flame-retardant micro-encapsulated sepiolite (MSEP) was successfully prepared by sol-gel method. Fourier transform infrared, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy dispersive spectroscopy were utilized to prove that sepiolite was encapsulated. Then, the mechanical properties, flame retardance, smoke suppression, and pyrolysis characteristics of silicone rubber foam (SiFs) with MSEP and zinc borate (ZB) were analyzed. The results indicated that the tensile and compressive properties of SiFs could evidently improve with the incorporation of MSEP/ZB. SiFs with 3 wt% MSEP and 6 wt% ZB could achieve an limiting oxygen index value of 30.9 vol% and UL-94 V-0 rating, the time to ignition was 64.7% above that of pure SiFs, the peak heat release rate and total heat release were 42.7% and 25.0% lower than that of pure SiFs, respectively. Furthermore, the peak smoke production rate and total smoke production of SiFs with 3 wt% MSEP and 6 wt% ZB were merely 54.22% and 64.10% of pure SiFs. Especially, the thermal stability of SiFs was significantly enhanced, and the carbon residue of SiFs became denser and more complete after adding 3 wt% MSEP and 6 wt% ZB.
通过溶胶-凝胶法成功制备了阻燃微胶囊化海泡石（MSEP）。利用傅里叶变换红外光谱、X射线光电子能谱、扫描电子显微镜和能谱分析来证明海泡石被包裹。然后，分析了含有MSEP和硼酸锌（ZB）的硅橡胶泡沫（SiFs）的力学性能、阻燃性、抑烟性和热解特性。结果表明，加入MSEP/ZB后，SiFs的拉伸和压缩性能可明显提高。含有3 wt% MSEP和6 wt% ZB的SiFs的极限氧指数值可达30.9 vol%，达到UL-94 V-0等级，着火时间比纯SiFs高64.7%，热释放峰值速率和总热释放量分别比纯SiFs低42.7%和25.0%。此外，含有3 wt% MSEP和6 wt% ZB的SiFs的最大产烟速率和总产烟量仅为纯SiFs的54.22%和64.10%。特别是，SiFs的热稳定性显著提高，加入3 wt% MSEP和6 wt% ZB后，SiFs的残炭变得更致密、更完整。
