超细玻纤的长度分布调控及其PTFE基复合材料力学性能  

LENGTH CONTROL OF ULTRA-THIN GLASS FIBER AND THEIR MECHANICAL PROPERTIES OF PTFE BASED COMPOSITE MATERIALS

作　　者：王军山[1] 金霞 贾倩倩 刘正 张立欣[1] WANG Jun-shan;JIN Xia;JIA Qian-qian;LIU Zheng(The 46th Research Institute of China Electronics Technology Group Corporation,Tianjin 300220,China)

机构地区：[1]中国电子科技集团公司第四十六研究所,天津300220

出　　处：《复合材料科学与工程》2020年第8期107-112,共6页Composites Science and Engineering

摘　　要：为了提高聚四氟乙烯(PTFE)基复合材料的力学性能,须在树脂基体中添加玻璃纤维作为增强材料。本文以超细玻璃纤维棉为研究对象,采用一种低速磨碎设备,通过调节设备的转速和磨碎的时间,调控棉状纤维的长度分布,采用鲍尔筛分仪表征纤维的长度分布,并与PTFE和陶瓷粉混合,制成短玻纤增强材料随机填充的PTFE基超薄复合片材。实验结果表明,以70 rpm、10 s的低速磨碎工艺条件制备的短玻纤长度分布适中,满足制备PTFE基复合材料的条件,在50目、100目、200目和400目筛网截留玻纤的质量分数分别为15.3wt%、20.8wt%、19.5wt%和14.6wt%,配置的纤维水浆料分散均匀无团聚体,制备的PTFE基复合材料的拉伸强度、拉伸模量和压缩模量分别提升至15.4 MPa、762 MPa和1232 MPa。In order to improve the mechanical properties of PTFE based composites,glass fiber must be added to the dielectric layer as the reinforcing material.In this paper,ultra-fine glass fiber cotton was taken as the research object.A kind of low-speed grinding equipment is adopted.By adjusting the speed and grinding time of the equipment,the length of glass fiber was controlled.The length information of the fiber was characterized by Bauer-Mcnett fiber classifier.Then the fibers were mixed with PTFE and ceramic powders to prepare PTFE based composite as randomly filling reinforcing material.The composite ultra-thin layers were made.The experimental results showed that the length distribution of the short glass fiber prepared under the grinding speed of 70 rpm and grinding time of 10 s was moderate,which met the requirement of PTFE matrix composite material preparation.The mass fraction of trapped glass fibers in 50 mesh,100 mesh,200 mesh and 400 mesh screens was 15.3 wt%,20.8 wt%,19.5 wt%and 14.6 wt%,respectively.The fiber slurry was evenly dispersed without aggregation,and the tensile strength,tensile module and compression module of the prepared PTFE based composite were increased to 15.4 MPa,762 MPa,and 1232 MPa,respectively.

关 键 词：玻璃纤维 玻纤长度 PTFE复合材料 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]