A highly fire-safe and smoke-suppressive single-component epoxy resin with switchable curing temperature and rapid curing rate

阻燃剂 环氧树脂 固化(化学) 烧焦 材料科学 烟雾 热解 化学工程 膨胀的 复合材料 化学 有机化学 工程类
作者
Shuang Yang,Siqi Huo,Jun Wang,Bin Zhang,Jingsheng Wang,Shiya Ran,Zhengping Fang,Pingan Song,Hao Wang
出处
期刊:Composites Part B-engineering [Elsevier]
卷期号:207: 108601-108601 被引量:217
标识
DOI:10.1016/j.compositesb.2020.108601
摘要

The design of highly fire-safe and smoke-suppressive single-component epoxy (EP) resins combining modest curing temperature and fast curing rate has been desirable yet very challenging in both academia and industry. Herein, we report a facile design of a phosphorus/imidazole-containing single-component EP system via incorporating 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and a flame-retardant curing agent cyclotriphosphazene-modified benzimidazole (BICP) into EP. Our results show that EP/DOPO/BICP exhibits a rapid modest-temperature curing feature because DOPO serves as a switch that triggers BICP to release benzimidazole (BIM) via substitution reaction in the initial curing stage. Moreover, as-prepared EP/DOPO/BICP shows outstanding fire retardancy, reflected by the high limited oxygen index (LOI) of 38.3% and UL-94 V-0 rating. Compared to the control EP system, the peak of heat release rate (PHRR) and total smoke production (TSP) of EP/DOPO/BICP remarkably decrease by ~74.5% and ~50.6%, respectively, which is superior to previously-reported flame-retardant P-containing epoxy counterparts. The significant enhancements in flame retardancy and smoke suppression are mainly due to the formation of a highly intumescent char layer and the reduced burning degree of pyrolysis fragments. This work offers a facile and scalable strategy for creating fast-curing, modest-temperature curable, highly fire-resistant and smoke-suppressive one-component epoxy systems applicable to large-scale industrial production.
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