Ethylenediamine modified ammonium polyphosphate (EDA-MAPP) and charring-foaming agents (CFA) were prepared using a simple chemical method and further used to make intumescent flame retardant coatings based on epoxy resin. The content of MAPP and CFA was fixed at a ratio of 2:1. Nanoparticles of magnesium aluminate (MgAl₂O₄ NPs) have been introduced into the flame retardant coating formulation in various quantities to evaluate the promotional action of MgAl₂O₄ NPs with a flame retardant coating system. The promotional action of MgAl₂O₄ NPs on the flame retardant coating formulation was studied using a vertical burning test (UL-94V), limiting oxygen index (LOI), thermogravimetric analysis (TGA) and Fourier transform infra-red spectroscopy (FTIR). The UL-94V results indicated that the addition of MgAl₂O₄ effectively increased flame retardancy and met the V-0 rating at each concentration. The TGA results revealed that the incorporation of MgAl₂O₄ NPs at each concentration effectively increased the thermal stability of the flame retardant coating system. Cone-calorimeter experiments show that MgAl₂O₄ NPs effectively decreased peak heat release rate (PHRR) and total heat release (THR). The FTIR results indicated that MgAl₂O₄ NPs can react with MAPP and generate a dense char layer that prevents the transfer of oxygen and heat.

中文翻译：

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铝酸镁纳米粒子对环氧树脂基膨胀型阻燃涂料体系的影响

乙二胺改性的聚磷酸铵（EDA-MAPP）和炭化发泡剂（CFA）使用简单的化学方法制备，并进一步用于制备基于环氧树脂的膨胀型阻燃涂料。MAPP和CFA的含量固定为2：1。铝镁镁（MgAl ₂ O ₄ NPs）的纳米颗粒已以各种数量引入到阻燃涂料配方中，以评估MgAl ₂ O ₄ NPs在阻燃涂料体系中的促进作用。MgAl ₂ O ₄的促进作用使用垂直燃烧测试（UL-94V），极限氧指数（LOI），热重分析（TGA）和傅里叶变换红外光谱（FTIR）研究了阻燃涂料配方中的NP。UL-94V结果表明，MgAl ₂ O _4的添加有效地提高了阻燃性，并在每种浓度下均达到了V-0等级。TGA结果表明，在每种浓度下掺入MgAl ₂ O ₄ NP有效地提高了阻燃涂料体系的热稳定性。锥形量热仪实验表明MgAl ₂ O ₄NP有效降低了峰值放热率（PHRR）和总放热（THR）。FTIR结果表明，MgAl ₂ O ₄ NP可以与MAPP反应并生成致密的炭层，从而防止氧气和热量的传递。