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Synthesis and characterization of SPDSCD and its flame retardant application on epoxy resins

机译：SPDSCD的合成与表征及其对环氧树脂的阻燃施用

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In this study, a flame retardant agent, 2,4,8,10-tetraoxo-3,9-diphosphospiro[5.5]undecane spirophosphate-4,4-diaminopair benzene disulfone-1,3,5-himetriazine (SPDSCD), is synthesized through a direct polycondensation reaction. SPDSCD is a chemically expanded phosphorus-containing flame retardant in epoxy resins (EP). The molecular structure of SPDSCD and thermal stability are characterized by nuclear magnetic resonance, Fourier transform infrared spectroscopy, and thermogravimetric analysis, and EP/SPDSCD composites were investigated in detail. These properties are associated with the phosphorus-containing spiro structure on the main molecular chain which can promote condensation polymerization into carbon during pyrolysis, the new nitrogen-containing carbon source, and the triazine structure. SPDSCD shows good thermal stability and low flammability, the weight loss from 500 to 800 °C was only 6.1 wt%, and the residual mass at 800 °C was 48.9 wt%. With the addition of SPDSCD, the flame retardant quality of the composites was gradually enhanced, the carbon residue becomes denser, which isolates heat transfer and inhibits the volatilization of flue gas. The addition of 20 wt% SPDSCD in the EP sample was associated with a limited oxygen index (LOI) value of 26% and a vertical burning V-0 rating. Cone calorimeter test shows that the peak heat release rate is reduced by 75%; the heat release rate curve enters the heat release platform area with a value lower than the first peak, TSP is reduced by 24%, the ac-CO _(2) Y value reduced by 25.6%, indicating that SPDSCD/EP produced less CO _(2) , which obviously prevented the combustion of volatile gas. SPDSCD exerted a charring and barrier effect in the condensation phase. Using basic characterization and flame retardancy testing, this work determined that SPDSCD has good flame retardancy when added to EP.
机译：在该研究中，阻燃剂，2,4,8,10-四氧-3,9-Diphosphospiro [5.5]未成分螺旋磷酸磷酸苯甲酸4,4-二氨基水苯二砜-1,3,5-HIMetrizine（SPDSCD）是通过直接缩聚反应合成。 SPDSCD是环氧树脂（EP）中的含有化学膨胀的含磷阻燃剂。 SPDSCD的分子结构和热稳定性的特征在于核磁共振，傅里叶变换红外光谱和热重分析，并详细研究了EP / SPDSCD复合材料。这些性质与主要分子链上的含磷螺旋结构有关，其可以在热解期间促进缩合聚合成碳，含新的含氮碳源和三嗪结构。 SPDSCD显示出良好的热稳定性和低易燃性，500至800℃的重量损失仅为6.1wt％，800℃下的残留物质为48.9wt％。随着SPDSCD的加入，复合材料的阻燃质量逐渐增强，碳残留物变得更密集，其分离热传递并抑制烟道气的挥发。在EP样品中加入20wt％SPDSCD与有限的氧指数（LOI）值为26％，垂直燃烧V-0等级相关。锥形量热计测试表明，峰值热释放速率降低了75％;热释放速率曲线进入具有低于第一峰值的值的热释放平台区域，TSP减少24％，AC-CO _（2）Y值减少25.6％，表明SPDSCD / EP产生了较少的CO _（2），这明显防止了挥发性气体的燃烧。 SPDSCD在冷凝阶段发出了炭化和屏障效应。使用基本表征和阻燃性测试，这项工作确定了当添加到EP时SPDSCD具有良好的阻燃性。

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