玻璃纤维滤材的疏水改性及过滤性能  

Hydrophobic modification and filtration performance of glass fiber filter material

作　　者：陈欣 俞杰[1] 李永国[1] 李昕 林中鑫 裴鉴禄 郑芹[1] 刘涛[1] 张昭辰 刘经国 张继荣[1] CHEN Xin;YU Jie;LI Yongguo;LI Xin;LIN Zhongxin;PEI Jianlu;ZHENG Qin;LIU Tao;ZHANG Zhaochen;LIU Jingguo;ZHANG Jirong(China Institute for Radiation Protection,Taiyuan 030006,China)

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《材料工程》2024年第4期200-208,共9页Journal of Materials Engineering

基　　金：国家级科研项目(KY20007)。

摘　　要：闭式循环过程会产生大量放射性气溶胶,其高湿、高酸、高放射性的特点导致基于玻璃纤维滤材的高效过滤器失效快、更换频率高。为解决上述问题,提出对传统的玻璃纤维滤材进行疏水性改性,以提高玻璃纤维滤材对苛刻工况的耐受性。利用低表面能改性剂(聚二甲基硅氧烷)对滤材进行化学性疏水性改性,通过引用SiO_(2)纳米颗粒物进行微结构构造,进一步改善疏水效果。借助SEM、FTIR、接触角测量仪等手段对改性效果进行了分析,并进一步研究了改性滤材的过滤性能。研究结果表明:改性方案能够有效改善玻璃纤维滤材的疏水性,并提高其耐湿性;单纯化学改性滤材的静态接触角可达146°,引入SiO_(2)纳米颗粒物后改性滤材的接触角超过150°;当改性剂中聚二甲基硅氧烷质量分数为2.0%、SiO_(2)纳米颗粒物质量分数为0.5%时,所得GF-PS-0.5滤材展现出最优的耐酸性,主要源于化学性疏水和结构性疏水的有效协同;GF-PS-0.5在经受足量的γ照射后,疏水性保持稳定,表明其良好的耐辐照性;改性滤材仍然保持了优异的过滤性能,其过滤效率超过99.99%。改性过程在提高滤材耐受性的同时,没有影响其过滤性能,展现出良好的应用前景。The closed-cycle process will generate a large number of radioactive aerosols,and its high humidity,high acidity,and high radioactivity lead to rapid failure and high replacement frequency of glass fiber high-efficiency filters.In order to solve the above problems,hydrophobic modification of the traditional glass fiber filter material was proposed to improve its tolerance to severe conditions.The low surface energy modifier(polydimethylsiloxane)was used to realize the chemical hydrophobicity of filter material.The microstructure was constructed by introducing SiO_(2) nanoparticles to further improve hydrophobicity.The modification effect was analyzed by means of SEM,FTIR and contact angle measuring instrument,and the filtration performance of the modified filter material was further studied.The research results show that the modification can effectively improve the hydrophobicity of the glass fiber filter material and improve its moisture resistance.The static contact angle of the simply chemically modified filter material can reach 146°,and the modified filter material after the introduction of SiO_(2) nanoparticles exhibit an angle of more than 150°.When the mass fraction of polydimethylsiloxane and SiO_(2) nanoparticles is 2.0%and 0.5%,respectively,the corresponding filter material GF-PS-0.5 shows the best acid resistance,which is mainly due to the synergy of chemical hydrophobicity and microstructural hydrophobicity.The hydrophobicity of GF-PS-0.5 remains stable after a sufficient amount ofγ-irradiation,indicating its good radiation resistance.The modified filter material maintains excellent filtration performance,and the filtration efficiency exceeds 99.99%.The modification process can improve the tolerance of the glass fiber filter material without influencing the filtration performance,showing a good application prospect.

关 键 词：闭式循环 玻璃纤维滤材 疏水改性 耐酸性 耐辐照性 

分 类 号：TQ343.1[化学工程—化纤工业]