Eco-friendly phosphonic acid piperazine salt toward high-efficiency smoke suppression and flame retardancy for epoxy resins.
Eco-friendly phosphonic acid piperazine salt toward high-efficiency smoke suppression and flame retardancy for epoxy resins.
复制标题
环保型膦酸哌嗪盐可用于环氧树脂的高效抑烟和阻燃。
DOI：
10.1007/s10853-021-06384-1
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发表时间：
2021
影响因子：
4.5
通讯作者：
Li Bin
中科院分区：
文献类型：
--
作者：
Xu Yue;Liu Lubin;Yan Chentao;Hong Yukai;Xu Miaojun;Qian Lijun;Li Bin
在电子电气应用领域，如何同步提高环氧树脂的阻燃抑烟性能一直是一个挑战。本研究以环境友好的方式合成了一种新型阻燃剂磷酸哌嗪盐（PTPAP），并将其用于制备阻燃EP热固性材料。详细研究了EP/PTPAP热固性材料的火灾安全性和阻燃机理。在EP基体中加入6wt%PTPAP，EP/PTPAP热固性材料的氧指数由纯EP的21.3%提高到28.3%，达到UL-94 V-0级，提高了32.9%。PTPAP的引入促进了EP基体的过早降解和炭化，燃烧过程中在EP/PTPAP热固性材料表面形成了膨胀、致密、封闭的炭层。PTPAP在气相中分解产生PO·和惰性气体，有效地发挥了自由基的捕集和稀释作用。结果表明，EP/PTPAP热固性材料具有良好的防火性能，有效地抑制了烟气和热量的散发，具有上级防火性能。这种阻燃EP/PTPAP热固性材料由于PTPAP的环保性和合成简单性，在可持续发展的环境下显示出广阔的应用前景。
In the field of electronic and electrical applications, it has always been a challenge to synchronously improve the flame-retardant and smoke-suppression properties for epoxy resins. In this research, a novel flame-retardant phosphonic acid piperazine salt (PTPAP) was successfully synthesized in an environmentally friendly manner and used to fabricate flame-retardant EP thermosets. The fire safety and flame-retardant mechanisms of EP/PTPAP thermosets were detailedly studied. When merely 6 wt% PTPAP was introduced into EP substrate, the EP/PTPAP thermosets gained UL-94V-0 grade and their LOI value improved from 21.3% of pure EP to 28.3% with the increase of 32.9%. The introduction of PTPAP promoted the premature degradation and charring of EP matrix, and the intumescent, compact, and sealed char layer was produced on the surface of EP/PTPAP thermosets during combustion. Besides, PTPAP decomposed and produced the PO· and inert gases, which efficaciously exerted the free radical trapping and dilution effect in vapor phase. Therefore, the emission of smoke and heat was distinctly constrained and the EP/PTPAP thermosets was endowed with the superior fire safety. This flame-retardant EP/PTPAP thermosets showed broad application prospects under the environment of sustainable development because of the eco-friendly and simplicity of the synthesis of PTPAP.Graphical abstract