Abstract: A novel latent curing agent for epoxy resin was synthesized via modifying dicyandiamide (DICY) with 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide （DOPO） through addition reaction. The chemical structure of the modified DICY was confirmed by FTIR and ¹H NMR. The thermal properties of this modified DICY and its epoxy curing system were evaluated by DSC and TG. It was found that the melting point of the modified DICY decreased markedly and curing temperature dropped by nearly 40℃. The optimized curing process was also presented. Moreover, latency and flame retardancy of this system was proven, the storage period was more than 100 d and limiting oxygen index (LOI) was 22.

Key words: modified dicyandiamide, DOPO, epoxy resin, latent curing agent, synthesis, kinetics, stability

摘要： 利用9，10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）的亲核特点，将其与双氰胺进行加成反应，合成了一种潜伏性固化剂，并将其与环氧树脂进行固化反应。用FTIR、¹H NMR分析了固化剂的结构；用DSC、TG分析了固化剂和固化体系的热性能。结果表明，与双氰胺相比，固化剂的熔点降低了近100℃，固化温度下降近 40℃；优化了固化工艺参数；考察了体系的潜伏性和难燃特性，其储存期超过100 d，LOI达到22。

关键词: 改性双氰胺, DOPO, 环氧树脂, 潜伏性固化剂, 合成, 动力学, 稳定性