Wang Lin, Li Yuyang, Yan Chenyang, Li Xiangmei, He Jiyu, Yang Rongjie
National Enginneering Research Center for Flame Retardant Materials, School of Materials Science & Engineering, Beijing Institute of Technology, 5 Zhongguancun South Street, Haidian District, Beijing 100081, China.
Polymers (Basel). 2024 Oct 21;16(20):2946. doi: 10.3390/polym16202946.
In order to mitigate the release of toxic phosphine from aluminum hypophosphite in twin-screw processing, montmorillonite-melamine cyanurate was prepared by three methods: (1) mechanical intercalation, (2) water intercalation and (3) in situ intercalation. The sheet spacing of montmorillonite was increased from 1.140 nm to 1.141 nm, 1.208 nm and 1.217 nm for these three methods, respectively, and scanning electron microscope (SEM) and transmission electron microscopy (TEM) proved that melamine cyanurate was successfully inserted into the montmorillonite sheets. The montmorillonite-melamine cyanurate from in situ intercalation can best inhibit the release of PH from aluminum hypophosphite, and the peaks of phosphine, mean values of phosphine and integral of phosphine were reduced by 81.9%, 72.1% and 72.2%, respectively. The mode of action of montmorillonite-melamine cyanuric inhibition of the emission of phosphine from aluminum hypophosphite can be attributed to the physical absorption of montmorillonite and the chemical bonding of melamine cyanurate. In addition, in situ intercalation can slightly improve flame retardancy, attributed to incomplete exfoliation of montmorillonite sheets.
为了减轻次磷酸铝在双螺杆加工过程中有毒磷化氢的释放，通过三种方法制备了蒙脱石-三聚氰胺氰尿酸盐：（1）机械插层法，（2）水插层法和（3）原位插层法。这三种方法使蒙脱石的片层间距分别从1.140 nm增加到1.141 nm、1.208 nm和1.217 nm，扫描电子显微镜（SEM）和透射电子显微镜（TEM）证明三聚氰胺氰尿酸盐成功插入蒙脱石片层中。原位插层法制备的蒙脱石-三聚氰胺氰尿酸盐对次磷酸铝中PH释放的抑制效果最佳，磷化氢的峰面积、磷化氢平均值和磷化氢积分分别降低了81.9%、72.1%和72.2%。蒙脱石-三聚氰胺氰尿酸盐抑制次磷酸铝中磷化氢排放的作用方式可归因于蒙脱石的物理吸附和三聚氰胺氰尿酸盐的化学键合作用。此外，原位插层法可略微提高阻燃性，这归因于蒙脱石片层的不完全剥离。
