Current research work focuses on the synthesis of phosphorus- and silicon-containing amine curing agent (PSA) for epoxy resins. PSA was synthesized using phenyl phosphonic dichloride and ethylenediamine as raw materials and further modification with 3-glycidoxypropyltrimethoxysilane. NMR, FTIR and amine value analysis were performed for the structure confirmation of the obtained product and intermediate. PSA was taken in different molar ratios for the crosslinking with epoxy resin before which the sol–gel technique was performed onto the product for self-crosslinking of the methoxy groups. The obtained formulations were applied onto the mild steel panels and cured in an oven. The thermal and mechanical properties of cured epoxy resins were analyzed by TGA, DSC, impact resistance, pencil hardness and flexibility. The thermal and mechanical properties were increased along with the heat resistance index temperature (T_HRI) toward the loading of PSA into the coating formulations. The flame retardant properties were also checked and found to be increased with respect to the increasing concentration of PSA because of the synergistic effect of P and Si atoms. The formulation with the highest amount of PSA showed the highest LOI as 29 with self-extinguishing behavior in the UL-94 test.

中文翻译：

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环氧树脂的含磷和含硅氨基固化剂

当前的研究工作集中在用于环氧树脂的含磷和含硅胺固化剂（PSA）的合成上。以苯基膦酸二氯化物和乙二胺为原料，用3-环氧丙氧基丙基三甲氧基硅烷进一步改性，合成了PSA。进行NMR，FTIR和胺值分析以确认所得产物和中间体的结构。PSA以不同的摩尔比用于与环氧树脂的交联之前，先对产品进行溶胶-凝胶技术以使甲氧基自交联。将获得的配方涂在低碳钢板上，并在烤箱中固化。通过TGA，DSC，抗冲击性，铅笔硬度和柔韧性分析了固化环氧树脂的热和机械性能。T _HRI），以将PSA负载到涂料配方中。还检查了阻燃性能，发现由于P和Si原子的协同作用，相对于PSA浓度的增加，阻燃性能有所提高。PSA含量最高的配方在UL-94测试中显示出最高的LOI为29，具有自熄性。