掺入低碳纤维制备无浆碳纤维纸原纸及其性能研究  

Preparation and properties of pulp-free carbon paper base paper by mixing with low-carbon fiber

作　　者：郭鹏飞 沈志刚[2] 刘永锋[1] GUO Pengfei;SHEN Zhigang;LIU Yongfeng(Zhejiang University,Hangzhou 310030;SINOPEC Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208)

机构地区：[1]浙江大学,浙江杭州310030 [2]中国石化上海石油化工研究院,上海201208

出　　处：《合成纤维工业》2024年第6期1-6,共6页China Synthetic Fiber Industry

基　　金：中石化科技开发项目(24/GFS26-H4-003)。

摘　　要：为解决质子交换膜燃料电池用碳纤维纸(CP)原纸均匀性差、强度偏低的问题,采用不同含碳量的6 mm无浆碳纤维混合抄纸(以高含碳量碳纤维为主体纤维、低含碳量碳纤维为掺杂纤维),通过控制低含碳量碳纤维的比例和浸渍液浓度制备CP原纸,研究其对CP原纸的厚度、均匀度、平面电阻率、拉伸强度及孔隙率的影响。结果表明:掺入低含碳量碳纤维有利于提高CP原纸的均匀性,增强CP原纸的力学性能;随着低含碳量碳纤维含量的增加,CP原纸的厚度减小,均匀度增大,平面电阻率增大,拉伸强度提高,孔隙率先降后升;随着浸渍液浓度的增加,CP原纸的厚度减小,均匀度增大,平面电阻率降低,拉伸强度提高,孔隙率降低;在浸渍液酚醛树脂质量分数为7.5%、低含碳量碳纤维质量分数为30%时,CP原纸的三维结构紧密,孔隙结构均匀,厚度为163.6μm,平面电阻率达32.0 mΩ·cm,拉伸强度为51.4 MPa,孔隙率达65.65%。To solve the problems of poor uniformity and low strength of carbon paper(CP)base paper for proton exchange membrane fuel cells,6 mm pulp-free carbon fibers with different carbon contents were mixed for papermaking(with high-carbon content carbon fiber as the main fiber and low-carbon content carbon fiber as the doped fiber).CP base paper was prepared by controlling the proportion of low-carbon content carbon fiber and the concentration of impregnation solution.Their effects on the thickness,uniformity,plane resistivity,tensile strength and porosity of CP base paper were studied.The results showed that the addition of low-carbon content carbon fibers was beneficial for improving the uniformity of CP base paper and enhancing its mechanical properties;the thickness of CP base paper decreased,the uniformity increased,the plane resistivity increased,the tensile strength increased,and the porosity first decreased and then increased with the increase of low-carbon content carbon fiber content;the thickness of CP base paper decreased,the uniformity increased,the plane resistivity decreased,the tensile strength increased,and the porosity decreased as the concentration of the impregnating solution increased;the prepared CP base paper had a compact three-dimensional structure,uniform pore structure,thickness of 163.6μm,plane resistivity of 32.0 mΩ·cm,tensile strength of 51.4 MPa and porosity of 65.65%when the mass fraction of phenolic resin in the impregnation solution was 7.5%and the mass fraction of low-carbon content carbon fiber was 30%.

关 键 词：碳纤维 碳纤维纸 厚度 拉伸强度 电阻率 孔隙率 

分 类 号：TQ342.742[化学工程—化纤工业]