Influence of aliphatic epoxy monomer on the blowing-out effect in the flame retardant epoxy resins

An aliphatic epoxy monomer "polypropyleneglycol-diglycidylether (PPGDGE, YF878)" is loaded in the epoxy resins (EP) to evaluate the influence of epoxy structure on the blowing-out effect, which is caused by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and octaphenyl silsesquioxane (OPS). The flame retarding properties of these EP composites were tested using the LOI and UL-94 procedures. The pyrolytic gases produced and the thermal stability of the EP composites with different flame retardants were detected by TGA-FTIR in air. The negative effect of YF878 was detected from the TTI, HRR, and p-HRR results after the cone calorimeter test. The char produced by the EP composites after the cone calorimeter test was investigated by FTIR. It is proposed that the aliphatic chain of the YF878 is easy to break down and produce combustible gases, so it does not easily form a crosslinked structure in the condensed phase. These results are very helpful for investigation of the conditions under which the blowing-out effect in epoxy resins can be caused by synergy of phosphorous and silicon.     

含离子液体热塑性聚氨酯弹性体复合材料的制备及阻燃性能

制备了咪唑型离子液体/热塑性聚氨酯弹性体(TPU)复合材料,分析了离子液体的种类、含量对聚氨酯弹性体氧指数、热释放、烟释放及热稳定性的影响.结果表明,与1-乙基-3-甲基咪唑六氟磷酸盐(EmimPF6)、1-十六烷基-3-甲基咪唑六氟磷酸盐(C16 mimPF6)相比,1-乙基-3-甲基咪唑溴盐(EmimBr)对TPU的阻燃效果更好,且其添加量存在最适量,过高或过低都不利于其在TPU阻燃中的适配性,当质量分数为3％时,阻燃效果最好,可使氧指数达24.3％、热释放峰值降低23.9％、烟释放峰值降低37.5％,高温下的热稳定性也得到改善.     

一种用于人工消减输电线覆冰的爆震药管

文章介绍了一种消减输电线覆冰爆震药管的设计、研究、性能及应用,提出并探讨了一种人工消减输电线覆冰的方法,进行了野外模拟除冰试验,并与计算机仿真模拟计算进行了对比,在人工消减雨凇方面进行了有益的探索。