SiO_2气凝胶对有机硅涂层耐高温与隔热性能改性研究  

Heat-resisting and Insulating Properties of SiO_2 Aerogel Modified Silicone Coating

作　　者：丁逸栋 刘朝辉[1] 王飞[2] 刘娜[1] 

机构地区：[1]后勤工程学院化学与材料工程系 [2]94786部队

出　　处：《后勤工程学院学报》2016年第5期77-83,共7页Journal of Logistical Engineering University

基　　金：全军后勤科研计划项目(BY115C007)

摘　　要：SiO_2气凝胶是一种具有三维空间网络结构的新型纳米材料,具有低密度、低导热系数以及耐高温和耐老化等性能。以SiO_2气凝胶为填料,将其添加到有机硅涂层中,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶红外变换光谱仪(FT-IR)等仪器,研究SiO_2气凝胶质量分数为1%,5%和10%时,各涂层加热到200,400,700℃时表面形貌、物相结构和表面基团变化情况,同时对各涂层添加不同质量分数SiO_2气凝胶后的耐高温和隔热性能进行研究。结果表明:随SiO_2气凝胶质量分数的增加,涂层耐高温性能提升,SiO_2气凝胶质量分数为10%时,涂层能在700℃高温下保持良好的性能;隔热性能也随SiO_2气凝胶质量分数的增加逐渐增强,与未添加SiO_2气凝胶的涂层相比,其最大温差可达11.2℃;同时,从XRD和FT-IR分析结果可知,随着温度的升高,涂层中的有机物逐渐分解,SiO_2和Al的结晶度逐渐提高,Si—O—Si特征峰强度提高最为明显。SiO_2 aerogel is a new kind of nanomaterial with three-dimensional network structure, and its properties includin-glow density, low thermal conductivity, high temperature resistance and anti-aging are fascinating. Adding the fillerof SiO_2 aerogelinto silicone coating at different mass fraction of 1%, 5% and 10%, respectively, surface morphology, phase structure and surfacegroupschangeof each coating heated to 200, 400, 700 ℃ were analyzed by scanning electron microscope（SEM）, X- ray diffraction（XRD）, fourier infrared transform spectrometer（FT-IR）, and other instruments, and heat-resisting and heat-insulating properties ofeach coating were also studied. The results show that： with the increase of SiO_2 aerogel mass fraction, heat-resisting and heat-insulat-ing performance are improved; when the SiO_2 aerogel mass fraction is 10%, the coating can resist 700 ℃ and keep good properties,and the temperature can reduce by 11.2 ℃. At the same time, the XRD and FT-IR results show that with the increase of tempera-ture, organic matter of coating decomposes gradually, while the crystallinity of SiO_2 and Al improves gradually, and the intensity of Si—O—Si feature peak improves remarkably.

关 键 词：SIO2气凝胶 有机硅涂层 耐高温 隔热 

分 类 号：TQ63[化学工程—精细化工]