To prepare flame-retardant epoxy resin, phosphorus compound containing di-hydroxyl group (10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phospha phenanthrene-10-oxide, DOPO-HQ) was reacted with uncured epoxy resin (diglycidyl ether of bisphenol A, YD-128) and then cured using a curing agent (dicyandiamide, DICY). This study focused on the effect of phosphorus compound/phosphorus content on physical properties and flame retardancy of cured epoxy resin. The thermal decomposition temperature of the cured epoxy resins (samples: P0, P1.5, P2.0, and P2.5, the number represents the wt% of phosphorus) increased with increasing the content of phosphorus compound/phosphorus (0/0, 19.8/1.5, 27.8/2.0, and 36.8/2.5 wt%) based on epoxy resin. The impact strength of the cured epoxy resin increased significantly with increasing phosphorus compound content. As the phosphorus compound/phosphorus content increased from 0/0 to 36.8/2.5 wt%, the glass transition temperature (the peak temperature of loss modulus curve) increased from 135.2°C to 142.0°C. In addition, as the content of phosphorous compound increased, the storage modulus remained almost constant up to higher temperature. The limiting oxygen index value of cured epoxy resin increased from 21.1% to 30.0% with increasing phosphorus compound/phosphorus content from 0/0 to 36.8/2.5 wt%. The UL 94 V test result showed that no rating for phosphorus compounds less than 19.8 wt% and V-1 for 27.8 wt%. However, when the phosphorus compound was 36.8 wt%, the V-0 level indicating complete flame retardancy was obtained. In conclusion, the incorporation of phosphorus compounds into the epoxy chain resulted in improved properties such as impact strength and heat resistance, as well as a significant increase in flame retardancy.

中文翻译：

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含活性磷阻燃剂的阻燃环氧树脂的制备及性能

为制备阻燃环氧树脂，含二羟基的磷化合物（10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phospha phenanthrene-10-oxide, DOPO-HQ）是与未固化的环氧树脂（双酚 A 的二缩水甘油醚，YD-128）反应，然后使用固化剂（双氰胺，DICY）固化。本研究侧重于磷化合物/磷含量对固化环氧树脂的物理性能和阻燃性的影响。固化后的环氧树脂（样品：P0、P1.5、P2.0、P2.5，数字代表磷的wt%）的热分解温度随着磷化合物/磷含量的增加（0/0 、19.8/1.5、27.8/2.0 和 36.8/2.5 wt%)，基于环氧树脂。随着磷化合物含量的增加，固化环氧树脂的冲击强度显着增加。随着磷化合物/磷含量从 0/0 增加到 36.8/2.5 wt%，玻璃化转变温度（损耗模量曲线的峰值温度）从 135.2°C 增加到 142.0°C。此外，随着磷化合物含量的增加，储能模量在更高的温度下几乎保持不变。随着磷化合物/磷含量从0/0增加到36.8/2.5wt%，固化环氧树脂的极限氧指数值从21.1%增加到30.0%。UL 94 V 测试结果表明，对于低于 19.8 wt% 的磷化合物和 27.8 wt% 的 V-1 没有评级。然而，当磷化合物为36.8wt%时，获得了表明完全阻燃的V-0水平。综上所述，