螺环磷酰咪唑阻燃棉织物的热解挥发物分析及热解机理推测  

Analysis of Pyrolytic Volatiles and Speculation of Pyrolysis Mechanism of Flame-Retardant Cotton Fabric with Spirocyclophosphamidazole

作　　者：许祥民 邓杰 杜雨琪 沈红亮 安泽坤 孙才英[1] XU Xiang-Min;DENG Jie;DU Yu-Qi;SHEN Hong-Liang;AN Ze-Kun;SUN Cai-Ying(Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials,College of Chemistry,Chemical Engineering and Resource Utilization,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学化学化工与资源利用学院,黑龙江省高校阻燃新材料重点实验室,哈尔滨150040

出　　处：《应用化学》2023年第3期380-388,共9页Chinese Journal of Applied Chemistry

基　　金：东北林业大学校级大学生创新训练项目(No.202110225448)资助。

摘　　要：在研究螺环磷酰咪唑(Fr)对棉织物的阻燃性能、力学性能和火行为的影响基础上,采用同步热分析红外(TG-IR)对螺环磷酰咪唑阻燃棉织物(Fr-cotton)的热解挥发物成分进行了研究。结果发现,螺环磷酰咪唑酯(Fr)是一种良好的棉织物阻燃剂,减少棉织物热解挥发物的生成量,使棉织物的极限氧指数(LOI)值从18.7%提高到36.6%,600℃时的残留从8.6%提高到28.5%。复配聚磷酸铵(APP)和氧化铈(CeO_(2),标记为MO)之后,棉织物的热分解挥发物进一步减少,主要成分仅为水和CO_(2)/CO,LOI值进一步提高到43%,600℃时的残留量提高到42.6%。说明阻燃剂主要在凝固相起作用,增加了残留物的量,减少了挥发物的生成,改变了棉织物的热解途径。棉织物热解通过左旋葡聚糖和呋喃类物质分解生成小分子挥发物,阻燃剂则催化棉织物直接脱水炭化分解。这一结论可以为棉织物阻燃剂的选择提供理论支持。On the basis of effects of spirocyclophosphoimidazole(Fr)on flame retardance,mechanical properties and fire behavior of cotton fabric,the pyrolysis volatiles of spirocyclophosphoimidazole flame retardant cotton(Fr-cotton)were studied by Thermogravimetric infrared(TG-IR).The results showed that Fr is a good flame retardant for cotton fabrics,which could reduce the pyrolysisvolatiles,increase limiting oxygen index(LOI)from 18.7%to 36.6%,and increasethe residue at 600℃from 8.6%to 28.5%.Adding ammonium polyphosphate(APP)and CeO_(2)(MO),the pyrolysis volatiles of Fr-cotton were further reduced,and the main components were only water and CO_(2)/CO,the LOI value was further increased to 43%,and the residue at 600℃was increased to 42.6%.This indicates that the flame retardant mainly acts in the solidified phase,increases the amount of residue,reduces the generation of volatiles,and changes the pyrolysis pathway of cotton fabric.Levoglucosan and furans are generated during the pyrolysis of cotton fabric,and then they decompose into small molecule volatiles.The flame retardants directlycatalyze cotton fabric dehydrateand carbonize.This conclusion can provide theoretical support for the selection of flame retardants for cotton fabrics.

关 键 词：阻燃棉织物 热解挥发物 热解机理 

分 类 号：O621.2[理学—有机化学]