Preparation and performance of modified SiO2 gel coating filter material
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摘要: 从滤料表面改性的角度对提高滤料在高湿环境中运行的稳定性进行研究。以聚对苯二甲酸乙二醇酯(PET)滤料为基材、正硅酸乙酯(TEOS)为前驱体、甲基三乙氧基硅烷(MTES)为低表面能物质，采用溶胶-凝胶法，在滤料表面原位生成SiO2纳米粒子，制备改性SiO2凝胶涂层滤料。采用FESEM- EDS、FTIR和接触角测量仪分析了PET滤料表面化学成分、润湿性能及表面形貌的变化。结果表明：整理后PET滤料表面生成SiO2纳米粒子，经MTES改性处理后滤料表面布满疏水的甲基基团，滤料疏水性能显著提高，其表面水接触角达154.11°。SiO2颗粒在滤料表面均匀分布，凝胶聚合物仅在纤维交叉处沉积，使滤料透气性得以保证，过滤效率由97.0595%增加到99.2028%，过滤品质因数由0.02124增加到0.02761，提升了30%。
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关键词:
- 聚对苯二甲酸乙二醇酯(PET)纤维滤料 /
- 超疏水特性 /
- 过滤性能 /
- 高湿黏性颗粒 /
- 溶胶-凝胶法
Abstract: In this paper, from the perspective of surface modification of filter material, how to improve its stability in high humidity environment has been studied. Using polyethylene terephthalate (PET) filter material as the substrate, ethyl orthosilicate (TEOS) as the precursor, and methyltriethoxysilane (MTES) as the low surface energy substance, the sol-gel method was used to generate in-situ on the surface of the filter material SiO2 nanoparticles to prepare modified SiO2 gel-coated filter material. Then, FESEM-EDS, FTIR and a contact angle measuring instrument were used to analyze the changes in the surface chemical composition, wettability and surface morphology of the PET filter material. The results show that SiO2 nanoparticles are formed on the surface after finishing, and the surface is covered with hydrophobic methyl groups after MTES modification treatment. Thus, its hydrophobic property is significantly improved, and its surface water contact angle reaches 154.11°. At the same time, the SiO2 particles are evenly distributed on the surface, and the gel polymer is only deposited at the intersection of the fibers, which ensures air permeability, and the filtration efficiency increases from 97.0595% to 99.2028%, and the filtration quality factor increases by 30%, from 0.02124 to 0.02761. -
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图 1 TEOS在碱性环境下水解缩合反应机制
Figure 1. Schematic diagram of TEOS hydrolysis condensation reaction in alkaline environment
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图 2 固定MTES浓度下MTES/TEOS变化时滤料表面的静态接触角
Figure 2. Contact angle on the filter surface when MTES/TEOS changes under fixed MTES concentration
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图 4 不同改性剂添加量(R0~R9)时纤维滤料的SEM图像
Figure 4. SEM images of fiber filter with different modifier addition amounts (R0~R9)
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图 5 改性前后滤料的FTIR图谱
Figure 5. FTIR spectra of filter material before and after modification
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图 8 滤料静态接触角随不同pH值的变化
Figure 8. Contact angle of filter changes with different pH values
表 1 不同改性SiO2凝胶的正硅酸乙酯(TEOS)、甲基三乙氧基硅烷(MTES)配比
Table 1 Ratio of ethyl orthosilicate (TEOS) and methyltriethoxysilane (MTES) of different modified SiO2 gels
Test number R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 TEOS/mol 0 0.022 0.064 0.072 0.022 0.064 0.072 0.022 0.064 0.072 MTES/mol 0 0.042 0.064 0.058 0.064 0.058 0.042 0.058 0.042 0.064 
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表 2 改性后滤料表面主要元素含量
Table 2 Content of main elements on the surface of modified filter material
Element C O Si Content/wt% 82.05 16.71 1.24
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表 3 改性前后滤料过滤性能变化
Table 3 Change of filter performance before and after modification
Untreated PET filter material R2 Filtration efficiency/% 97.0595 99.2028 Filter resistance/Pa 166 175 Quality factor 0.02124 0.02761
下载: 导出CSV
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