A facile strategy for enhancing the fire safety of unsaturated polyester resins through introducing an efficient monocomponent intumescent flame retardant.
A facile strategy for enhancing the fire safety of unsaturated polyester resins through introducing an efficient monocomponent intumescent flame retardant.
复制标题
通过引入高效单组分膨胀型阻燃剂来增强不饱和聚酯树脂防火安全性的简便策略
DOI：
10.1002/pat.4852
复制
发表时间：
2020
影响因子：
3.4
通讯作者：
Bin Li
中科院分区：
文献类型：
--
作者：
Lubin Liu;Yue Xu;Yintong He;Miaojun Xu;Wen Wang;Bin Li
不饱和聚酯树脂（UPR）通常用于汽车和电子电器领域，但其自然可燃性严重限制了其广泛应用。本研究将单组分膨胀型阻燃剂焦磷酸哌嗪（PPAP）加入到UPR基体中，全面研究了UPR/PPAP的阻燃性能、热性能、燃烧性能和阻燃机理。引入低至 18wt% PPAP 后，UPR/18wt% PPAP 热固性材料在垂直燃烧试验中满足 UL-94V-0 级，极限氧指数值达到 29.8%。锥形量热仪测试表明，与UPR相比，放热峰值和CO产生峰值明显下降，分别降低了60.9%和70.2%。 PPAP 的加入有效地提高了 UPR 热固性材料的防火安全性。对UPR/PPAP热固性材料阻燃机理的研究表明，PPAP促使UPR热固性材料在热固性材料表面提前形成充分、致密、部分石墨化、膨胀的炭层，并且炭层在凝聚相中有效发挥屏蔽作用。因此，UPR/PPAP的总热量受到抑制，与UPR相比减少了42.5%。总体而言，阻燃UPR/PPAP热固性材料优异的防火安全性能在一些关键领域具有重要的应用价值。
Unsaturated polyester resins (UPRs) are usually used in the field of automotive and electronic appliances, but their natural flammability severely constrain their wide application. In this research, a mono‐component intumescent flame retardant piperazine pyrophosphate (PPAP) was incorporated into the UPR matrix and the fire retardancy, thermal properties, combustion performance, and flame‐retarded mechanisms of UPR/PPAP were comprehensively investigated. With as low as 18 wt% PPAP introduced, UPR/18 wt% PPAP thermosets fulfilled UL‐94 V‐0 grade during vertical burning tests and the limiting oxygen index value reached 29.8%. Cone calorimeter tests shown that the peak of heat release and CO production were prominently declined with the decrease of 60.9% and 70.2% compared with those of UPR. The incorporation of PPAP efficaciously enhanced the fire safety of UPR thermosets. The investigation of flame‐retarded mechanisms for UPR/PPAP thermosets indicated that PPAP stimulated UPR thermosets to form sufficient, compact, partially graphitized, and expanded char layer on thermosets surface in advance and the char layer effectively exerted shielding effect in condensed phase. Thus, the total amount of heat of UPR/PPAP was suppressed with the reduction of 42.5% compared with that of UPR. Overall, the excellent fire safety performance promised the flame‐retardant UPR/PPAP thermosets crucial application values in some key areas.