WANG Quan, SHI Tiejun, YU Fu, et al. Synthesis and properties of novel latent curing agent[J]. CIESC Journal, 2014, (9): 3712-3717.DOI: 10.3969/j.issn.0438-1157.2014.09.056.
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.