Hydrophobic modification and filtration performance of glass fiber filter material
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 SiO2 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 SiO2 nanoparticles exhibit an angle of more than 150°.When the mass fraction of polydimethylsiloxane and SiO2 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 of γ-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.
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