用甲基纤维素作粘结剂,硅烷偶联剂作粘结助剂,聚丙烯酸作分散剂,设计了一种新涂膜液,通过一步法浸渍涂膜,直接在大孔管状支撑体上制备了一种无中间层氧化铝陶瓷膜,省去了中间过渡层,缩短了制备时间,降低了生产成本。采用傅里叶变换红外...用甲基纤维素作粘结剂,硅烷偶联剂作粘结助剂,聚丙烯酸作分散剂,设计了一种新涂膜液,通过一步法浸渍涂膜,直接在大孔管状支撑体上制备了一种无中间层氧化铝陶瓷膜,省去了中间过渡层,缩短了制备时间,降低了生产成本。采用傅里叶变换红外光谱仪分析涂膜液成分的作用机理,结果表明:硅烷偶联剂KH-550与甲基纤维素的氢键作用使涂膜液的稳定性得到增强。通过扫描电子显微镜、比表面积与孔径、孔隙率和纯水渗透通量测试,研究了陶瓷膜的显微结构和性能。用本研究设计的涂膜液制备的陶瓷膜,膜层厚度约为35 μm,平均孔半径约为0.285 μm,纯水渗透通量高达1990 L m−2 h−1 bar−1。通过一步法成功制备出无中间过渡层的陶瓷膜,节省了制备时间和成本,并提高了渗透通量。本研究对于低成本制备高性能陶瓷膜有一定的参考价值。A new coating solution was designed by using methyl cellulose as binder, silane coupling agent as binder and polyacrylic acid as dispersant. A kind of alumina ceramic membrane without intermediate layer was prepared directly on the macroporous tubular support by one-step impregnation coating. The intermediate transition layer was omitted, the preparation time was shortened and the production cost was reduced. The mechanism of the composition of the coating solution was analyzed by Fourier transform infrared spectroscopy. The results showed that the hydrogen bond between silane coupling agent KH-550 and methyl cellulose enhanced the stability of the coating solution. The microstructure and properties of the ceramic membranes were studied by scanning electron microscopy, specific surface area and pore size, porosity and pure water permeation flux tests. The ceramic membrane prepared with the coating solution designed in this study has a membrane thickness of about 35 μm, an average pore radius of about 0.285 μm, and a pure water permeation flux of up to 1990 L m−2 h−1 bar−1. The ceramic membrane without intermediate transition layer was successfully prepared by one-step method, which saved the preparation time and cost, and improved the permeation flux. This study has a certain reference value for the preparation of high-performance ceramic membranes at low cost.展开更多
文摘用甲基纤维素作粘结剂,硅烷偶联剂作粘结助剂,聚丙烯酸作分散剂,设计了一种新涂膜液,通过一步法浸渍涂膜,直接在大孔管状支撑体上制备了一种无中间层氧化铝陶瓷膜,省去了中间过渡层,缩短了制备时间,降低了生产成本。采用傅里叶变换红外光谱仪分析涂膜液成分的作用机理,结果表明:硅烷偶联剂KH-550与甲基纤维素的氢键作用使涂膜液的稳定性得到增强。通过扫描电子显微镜、比表面积与孔径、孔隙率和纯水渗透通量测试,研究了陶瓷膜的显微结构和性能。用本研究设计的涂膜液制备的陶瓷膜,膜层厚度约为35 μm,平均孔半径约为0.285 μm,纯水渗透通量高达1990 L m−2 h−1 bar−1。通过一步法成功制备出无中间过渡层的陶瓷膜,节省了制备时间和成本,并提高了渗透通量。本研究对于低成本制备高性能陶瓷膜有一定的参考价值。A new coating solution was designed by using methyl cellulose as binder, silane coupling agent as binder and polyacrylic acid as dispersant. A kind of alumina ceramic membrane without intermediate layer was prepared directly on the macroporous tubular support by one-step impregnation coating. The intermediate transition layer was omitted, the preparation time was shortened and the production cost was reduced. The mechanism of the composition of the coating solution was analyzed by Fourier transform infrared spectroscopy. The results showed that the hydrogen bond between silane coupling agent KH-550 and methyl cellulose enhanced the stability of the coating solution. The microstructure and properties of the ceramic membranes were studied by scanning electron microscopy, specific surface area and pore size, porosity and pure water permeation flux tests. The ceramic membrane prepared with the coating solution designed in this study has a membrane thickness of about 35 μm, an average pore radius of about 0.285 μm, and a pure water permeation flux of up to 1990 L m−2 h−1 bar−1. The ceramic membrane without intermediate transition layer was successfully prepared by one-step method, which saved the preparation time and cost, and improved the permeation flux. This study has a certain reference value for the preparation of high-performance ceramic membranes at low cost.
