聚对苯二甲酸乙二醇酯滤料超疏水表面的制备及性能

Preparation and properties of polyethylene terephthalate filter material with superhydrophobic surface

以聚对苯二甲酸乙二醇酯(PET)滤料为基体材料,正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为改性剂,采用溶胶-凝胶法,制备超疏水性PET滤料。在此基础上,采用场发射扫描电子显微镜(FESEMEDS)、傅里叶变换红外光谱仪(FTIR)和接触角测试仪研究PET滤料改性前后的微观形貌、表面组成以及接触角等参数。研究表明:改性前后滤料微观孔隙率基本不变,TEOS改性的PET(T-PET)滤料由于形成大量亲水性的−OH基团,呈现完全润湿性;MTES改性的PET(M-PET)滤料表面存在疏水性的−CH3基团,呈现高疏水性;TEOS和MTES共同改性的PET(MT-PET)滤料表面由于大量疏水性的−CH3基团,且有大量的含有−CH3基团SiO2纳米粒子沉积在纤维表面,降低了滤料表面能,形成纳米级粗糙、褶皱甚至凸起形态;MT-PET的静态接触角(WCA)为(158.8±1.2)°,流失角(WSA)为(6.9±1.5)°,达到超疏水状态。此外,通过喷涂湿粉尘和水中浸泡(室温)滤料对比试验,表明MT-PET滤料具有良好的自清洁性能与稳定性。综上,本文中MT-PET超疏水滤料的制备,对于高湿环境下的袋式除尘材料的研究开发具有潜在价值。

Superhydrophobic polyethylene terephthalate(PET)filter was prepared by sol-gel method with PET filter as matrix material,tetraethyl orthosilicate(TEOS)and methyl triethoxysilane(MTES)as modifiers.Field emission scanning electron microscopy(FESEM-EDS),Fourier transform infrared spectrometer(FTIR)and contact angle measurement were introduced to investigate the micro morphology,surface composition and contact angle of PET filter material before and after modification.The results show that the porosity of the filter material is slightly changed after modification.TEOS-modified PET(T-PET)filter material shows superhydrophilic due to the formation of a large numbers of hydrophilic−OH groups.On the contrary,hydrophobic−CH3 groups are existed on the surface of MTES modified PET(M-PET)filter material,which endows high hydrophobicity.Moreover,TEOS and MTES modified PET(MT-PET)filter material displays superhydrophobicity due to lots of SiO2 nanoparticles covered by−CH3 groups are deposited on the fiber surface,reducing the surface energy of the filter material and forming micro-nano,wrinkled and even convex structure.MT-PET presents static contact angle(WCA)of(158.8±1.2)°with water shedding angle(WSA)of(6.9±1.5)°,indicating superhydrophobic state of MT-PET filter material.In addition,through the contrast test of spraying wet dust and soaking filter material in water(room temperature),it shows that MT-PET filter material has good self-cleaning performance and stability.In conclusion,the preparation of superhydrophobic MT-PET filter material in this paper has potential value for the research and development of bag filter material in high humidity environment.