RPUF用rGO/SiO2气凝胶阻燃涂层制备及性能研究  

Preparation and property study of rGO/SiO2 aerogel flame-retardantcoating for RPUF

作　　者：江赛华 黄裕斌 游文杰 JIANG Saihua;HUANG Yubin;YOU Wenjie(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou Guangdong 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《中国安全科学学报》2020年第9期142-148,共7页China Safety Science Journal

基　　金：国家自然科学基金资助(21704111);国家重点研发计划(2018YFC0809005);广东省自然科学基金资助(2019A1515011044);广州市科技计划项目(201806010113)。

摘　　要：为改善聚氨酯硬泡(RPUF)的易燃特性,提升其火灾安全性,采用溶胶-凝胶法将还原氧化石墨烯(rGO)与二氧化硅(SiO2)气凝胶结合制备出复合rGO/SiO2气凝胶,与聚二甲基硅氧烷(PDMS)复配后涂敷于RPUF表面,制备涂层阻燃RPUF;采用扫描电子显微镜(SEM)和红外光谱分析rGO/SiO2气凝胶的形貌结构;通过热重和垂直燃烧测试研究涂层阻燃RPUF的热解行为和阻燃性能;探究不同rGO含量对阻燃性能的影响,揭示涂层阻燃机制。结果表明:气凝胶涂层高温下残炭率高,热稳定性优异,能够抵抗热量侵蚀;其中0.05%rGO/SiO2涂层阻燃RPUF到达V-0级别,表现出快速的自熄性能。气凝胶涂层可以作为高效物理屏障,阻断或延缓传质传热过程。In order to improve flammability and fire safety of RPUF,rGO/SiO2 aerogel was prepared via sol-gel method by combining reduced graphene(rGO)with SiO2 aerogel.Secondly,it was mixed with polydimethylsiloxane(PDMS)and applied on surface of RPUF to fabricate coated flame-retardant RPUF.Then,its morphology and structure were analyzed by using SEM and infrared spectroscopy,and pyrolytic behavior and flame retardancy of coated RPUF were studied via thermogravimetric and vertical combustion tests.Finally,influence of different rGO contents on flame retardancy was studied,and flame retardant mechanism of aerogel coating was revealed.The results show that aerogel coating has high char residue and excellent thermal stability under high temperature,which can resist thermal erosion effectively.Among them,0.05%rGO/SiO2 coatedRPUFsamplereachesV-0 level,showingrapidself-extinguishing performance.It suggests that aerogel coatings can act’as an efficient physical barrier to block or delay mass and heat transfer.

关 键 词：聚氨酯硬泡(RPUF) 还原氧化石墨烯(rGO)/二氧化硅(SiO2) 气凝胶 阻燃涂层 扫描电子显微镜(SEM) 物理屏障 

分 类 号：X932[环境科学与工程—安全科学]