In this work, a novel nitrogen, phosphorus and boron ionic pair compound (DTPA[AZB]), composed of a protonated flame retardant (DTPA) 6,6'‐(1,4‐phenylenebis((pyrazin‐2‐ylamino)methylene))bis(dibenzo[c,e][1,2]oxaphosphinine 6‐oxide) and a counter anion alizarin borate (AZB), has been prepared and fully characterized, AZB was synthesized by the reaction of alizarin with boric acid. DTPA was produced in two steps. First, terephthalaldehyde was condensed with aminopyrazine to form the corresponding imine. This was treated with 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) to generate DTPA. Blending with DTPA greatly reduced the flammability of epoxy resin. When the amount of DTPA added was 4%, a modified epoxy resin passed the V‐0 rating and the limiting oxygen index (LOI) reached 32.5%. With the introduction of 3% AZB into the EP/DTPA material, the LOI reached 33.5%. Simultaneously, compared with that of neat EP, the peak heat release rate and smoke production rate for EP/DTPA‐4 was decreased by 24.1% and 40.7%, respectively, and the peak heat release rate and smoke production rate for EP/DTPA[AZB]‐3 was decreased by 32.9% and 43.4%, respectively. The results indicate that AZB and DTPA show good cooperative flame retardant effects. The flame retardancy of the modified epoxy is improved with greater heat release suppression combustion of the resin. A mode of flame retardant action has been proposed based on analysis results from Py‐GC/MS for DTPA, and SEM, IR and Raman for the residual carbon from cone calorimeter and UL‐94 tests, respectively. Importantly, the tensile strength, fexural strength, and fexural modulus of the EP/DTPA[AZB] increased compared with the same properties of neat EP.

中文翻译：

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一种新型的氮，磷和硼离子对化合物，可提高环氧树脂的防火安全性和机械增强效果

在这项工作中，一种新型的氮，磷和硼离子对化合物（DTPA [AZB]）由质子化阻燃剂（DTPA）6,6'-（1,4-亚苯基双（（吡嗪-2-基氨基）亚甲基））制备了双（二苯并[c，e] [1,2]草酰膦6-氧化物）和抗衡阴离子茜素硼酸盐（AZB），并通过茜素与硼酸反应合成了AZB。DTPA分两步生产。首先，将对苯二甲醛与氨基吡嗪缩合形成相应的亚胺。用9,10-二氢-9-氧杂-10-磷菲10-氧化物（DOPO）处理以生成DTPA。与DTPA混合可大大降低环氧树脂的可燃性。当DTPA的添加量为4％时，改性环氧树脂通过V-0额定值，极限氧指数（LOI）达到32.5％。通过在EP / DTPA材料中引入3％的AZB，LOI达到了33.5％。同时，与纯净EP相比，EP / DTPA-4的峰值放热率和发烟率分别降低了24.1％和40.7％，而EP / DTPA-4的峰值放热率和发烟率[ AZB] -3分别下降了32.9％和43.4％。结果表明，AZB和DTPA表现出良好的协同阻燃作用。改性环氧树脂的阻燃性随着树脂的更大的放热抑制燃烧而得到改善。分别根据Py-GC / MS对DTPA的分析结果以及SEM，IR和Raman对锥形量热仪和UL-94测试中残留碳的分析结果，提出了一种阻燃作用模式。重要的是，抗拉强度，弯曲强度，