Economical and facile synthesis of a highly efficient flame retardant for simultaneous improvement of fire retardancy, smoke suppression and moisture resistance of epoxy resins
Economical and facile synthesis of a highly efficient flame retardant for simultaneous improvement of fire retardancy, smoke suppression and moisture resistance of epoxy resins
复制标题
经济、简便地合成高效阻燃剂，同时提高环氧树脂的阻燃性、抑烟性和防潮性
DOI：
10.1016/j.compositesb.2019.03.017
复制
发表时间：
2019-06-15
影响因子：
13.1
通讯作者：
Li, Bin
中科院分区：
文献类型：
--
作者：
Liu, Lubin;Xu, Yue;Li, Bin
以三聚氰胺和焦磷酸钠为原料合成了一种经济型阻燃剂焦磷酸二蜜胺（DMPY），并对其结构进行了表征和确证。将其用于阻燃环氧树脂（EP）热固性材料，研究了EP热固性材料的阻燃性能、力学性能、耐湿性及阻燃机理。当DMPY含量为9wt%时，试样的垂直燃烧性能达到UL-94 V-0级，极限氧指数达到28.7%。DMPY促进了EP基体的提前降解和燃烧过程中膨胀致密炭层的形成。此外，DMPY分解产生的不可燃气体在气相中起到阻燃作用。因此，热释放和烟产生的速率和总量被显著抑制。与纯EP相比，EP/DMPY热固性材料的耐湿性得到了提高。由于DMPY具有优异的耐水性，在耐水性测试后，样品保持了优异的上级阻燃性能和力学性能。总之，EP/DMPY热固性材料具有优异的阻燃性、耐湿性、力学性能和防火性能。由于DMPY成本低、易于工业化，因此在高性能阻燃环氧热固性材料领域具有广阔的应用前景。
An economical flame retardant additive dimelamine pyrophosphate (DMPY) was synthesized from melamine and sodium pyrophosphate and its chemical structure was well characterized and confirmed. It was used to flame retardant epoxy resin (EP) thermosets and the fire retarded performance, mechanical properties, moisture resistance and flame retardant mechanism of EP thermosets were investigated in details. The samples achieved UL-94 V-0 grade during vertical burning tests and the limiting oxygen index value reached 28.7% when 9 wt% DMPY was incorporated. DMPY stimulated the degradation of EP matrix in advance and the formation of intumescent and compact char layer during combustion. Besides, the nonflammable gases generated from the decomposition of DMPY exerted flame retarded effect in gas phase. Thus, the rate and total amount of heat release and smoke production were significantly suppressed. The moisture resistance of EP/DMPY thermosets was improved comparing with that of pure EP. The samples remained superior flame retardant performance and mechanical properties after water resistance tests due to the excellent water resistance of DMPY. In summary, the EP/DMPY thermosets exhibited excellent flame retardancy, moisture resistance, mechanical properties and fire safety performance. The presented investigation provided a broad application prospect in the high-performance field of flame retardant EP thermosets because of the low cost and easy industrialization of DMPY.