Intumescent flame retardant (IFR) has received the considerable attention ascribed to the inherent advantages including non‐halogen, low toxicity, low smoke release and environmentally friendly. In this work, a novel charring agent poly (piperazine phenylaminophosphamide) named as PPTA was successfully synthesized and characterized by Fourier transform infrared spectra (FTIR) and X‐ray photoelectron spectroscopy (XPS). Then, a series of flame‐retardant EP samples were prepared by blending with ammonium polyphosphate (APP) and PPTA. Combustion tests include oxygen Index (LOI), vertical Burning Test (UL‐94) and cone calorimeter testing，these test results showed that PPTA greatly enhances the flame retardancy of EP/APP. According to detailed results, EP containing 10 wt% APP had a LOI value of 30.2%，but had no enhancement on UL‐94 rating. However, after both 7.5 wt% APP and 2.5 wt% PPTA were added, EP‐7 passed UL‐94 V‐0 rating with a LOI value of 33.0%. Moreover, the peak heat release rate (PHRR) and peak of smoke product rate (PSPR) of EP‐7 were greatly decreased. Meanwhile, the flame‐retardant mechanism of EP‐7 was investigated by scanning electron microscopy (SEM), thermogravimetric analysis/infrared spectrometry (TG‐IR) and X‐ray photoelectron spectroscopy (XPS). The corresponding results presented PPTA significantly increased the density of char layer, resulting in the good flame retardancy.

中文翻译：

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新型膨胀型阻燃剂赋予环氧树脂高阻燃性

膨胀型阻燃剂（IFR）因其固有的优点而受到了广泛的关注，这些优点包括无卤素，低毒性，低烟释放和环境友好。在这项工作中，成功合成了名为PPTA的新型炭化剂聚（哌嗪苯基氨基磷酰胺），并通过傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对其进行了表征。然后，通过与多磷酸铵（APP）和PPTA混合，制备了一系列阻燃EP样品。燃烧测试包括氧气指数（LOI），垂直燃烧测试（UL‐94）和锥形量热仪测试，这些测试结果表明PPTA大大提高了EP / APP的阻燃性。根据详细结果，包含10 wt％APP的EP的LOI值为30.2％，但UL-94等级没有提高。然而，在同时添加7.5 wt％的APP和2.5 wt％的PPTA之后，EP-7通过了UL‐94 V-0等级，LOI值为33.0％。此外，EP-7的峰值放热率（PHRR）和烟气生成率峰值（PSPR）大大降低。同时，通过扫描电子显微镜（SEM），热重分析/红外光谱（TG-IR）和X射线光电子能谱（XPS）研究了EP-7的阻燃机理。相应的结果表明，PPTA显着提高了炭层的密度，从而带来了良好的阻燃性。通过扫描电子显微镜（SEM），热重分析/红外光谱（TG-IR）和X射线光电子能谱（XPS）研究了EP-7的阻燃机理。相应的结果表明，PPTA显着提高了炭层的密度，从而带来了良好的阻燃性。通过扫描电子显微镜（SEM），热重分析/红外光谱（TG-IR）和X射线光电子能谱（XPS）研究了EP-7的阻燃机理。相应的结果表明，PPTA显着提高了炭层的密度，从而带来了良好的阻燃性。