聚四氟乙烯浸渍石墨工艺及其性能研究  

Research on process and properties of polytetrafluoroethylene impregnated graphite

作　　者：邵珠花 田蒙奎[1] 颜婷珪 蒋凤易 郝立通 杨颖 SHAO Zhu-hua;TIAN Meng-kui;YAN Ting-gui;JIANG Feng-yi;HAO Li-tong;YANG Ying(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;Guizhou Lanxin Graphite Electrical Equipment Manufacturing Co.Ltd.,Fuquan 550500,China)

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]贵州兰鑫石墨机电设备制造有限公司,贵州福泉550500

出　　处：《高校化学工程学报》2020年第2期519-524,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21663009);贵州省石墨装备制造及应用科技创新人才团队(黔科合人才团队(2015)4004号);贵州省优秀青年科技人才计划(黔科合平台人才[2017]5605);贵州省科技支撑计划项目(黔科合支撑[2019]2835号)。

摘　　要：聚四氟乙烯(PTFE)因其优异的耐腐蚀性和耐热性可被用作浸渍剂制备不透性石墨,为了缩短聚四氟乙烯浸渍石墨的工艺耗时以及增强浸渍效果,进行了浸渍和塑化工艺的优化研究。在常温、0.7MPa条件下对石墨分别进行1、2、3、4次浸渍处理,后在常压、380℃条件下塑化,并对浸渍塑化后的石墨进行密度、增重率、开孔气孔率、偏光显微镜、耐热性和抗压强度等性能表征分析。结果表明:石墨密度、增重率和抗压强度随着浸渍次数的增加而升高,开孔气孔率和耐热性能随浸渍次数的增加而降低,n浸1塑工艺比n浸n塑工艺浸渍石墨的效果好;石墨经3浸1塑工艺处理后,其抗压强度高达50.1 MPa,开孔气孔率低至0.754%.Polytetrafluoroethylene(PTFE)can be used as an impregnating agent to prepare impermeable graphite due to its excellent corrosion and heat resistance.Impregnation and plasticization processes were optimized to shorten the PTFE-impregnated graphite process time and enhance impregnation effects.Graphite was impregnated with PTFE at room temperature and 0.7 MPa for 1,2,3 and 4 times,respectively,which was then plasticized at atmospheric pressure and 380℃.The immersion and plasticization of graphite was characterized by density,weight gain rate,open porosity,polarized light microscopy,thermogravimetry and compressive strength.The results show that density,weight-gain rate and compressive strength of graphite increase and the open porosity and temperature resistance decrease with the increase of impregnation times.Multiple impregnation with one plasticization was better than multiple impregnation with multiple plasticization.The graphite treated with three-time impregnation and one plasticization had compressive strength of 50.1 MPa and open porosity of 0.754%.

关 键 词：不透性石墨 浸渍剂 浸渍工艺 聚四氟乙烯 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TQ050.4