微晶石墨在聚四氟乙烯中的高分散性实验研究  

Experimental Study of High Dispersion of Microcrystalline Graphite(MCG)in Polytetrafluoroethylene(PTFE)

作　　者：方丽华[1] 张淞玮 陈钰洁 林凯琳 苏志忠[1] 李秋影[3] FANG Lihua;ZHANG Songwei;CHEN Yujie;LIN Kailin;SU Zhizhong;LI Qiuying(School of Resources and Chemical Engineering,Sanming University,Sanming 365004,China;College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China;School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200030,China)

机构地区：[1]三明学院资源与化工学院,福建三明365004 [2]厦门大学化学化工学院,福建厦门361000 [3]华东理工大学材料科学与工程学院,上海200030

出　　处：《三明学院学报》2024年第3期112-118,共7页Journal of Sanming University

基　　金：福建省科技厅引导性项目(2023H0018)。

摘　　要：为解决聚四氟乙烯导热系数低、力学性能不佳等性能缺陷,研究共凝聚工艺,开发微晶石墨填充改性聚四氟乙烯新技术。考察聚四氟乙烯原料性质、微晶石墨的表面改性方法、分散剂、共凝聚温度、搅拌速率等因素对微晶石墨分散性的影响。结果发现,聚四氟乙烯分散液、共凝聚温度是影响复合材料的关键因素,选择聚四氟乙烯分散母液替代分散乳液为原料,采用硅烷偶联剂对微晶石墨进行表面改性处理后,以N,N-二甲基甲酰胺为分散溶剂,控制共凝聚温度为(19±3)℃,搅拌转速控制在300~400 r/min范围时,可以实现微晶石墨在聚四氟乙烯基体中的均匀分散。In order to solve the performance defects such as low thermal conductivity and poor mechanical properties of PTFE,the co-condensation process was studied,and a new technology of MCG filling modified PTFE was developed.The ef⁃fects of the raw material property,the surface modification method,dispersant,co-condensation temperature,and stirring rate on the dispersion of MCG are investigated.The results show that the PTFE dispersion and co-condensation temperature are the key factors affecting the composite materials.When the dispersion solution is selected to replace the dispersed emulsion as raw material,with N and N-dimethylformamide as the dispersed solvent,the co-condensation temperature is 19±3℃,and the stirring speed is controlled in the range of 300~400 r/min,the uniform dispersion of microcrystalline graphite in the PTFE matrix can be realized.

关 键 词：微晶石墨 聚四氟乙烯 共凝聚技术 分散性 

分 类 号：TB332[一般工业技术—材料科学与工程]