Preparation method of homogeneous modified sodium borosilicate glass hollow fiber membrane
A technology of sodium borosilicate glass and fiber membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult graft modification rate, unstable membrane performance, and poor interface compatibility, etc. Achieve the effects of improving permeation flux and separation performance, good interfacial bonding performance, and low sintering temperature
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Embodiment 1
[0019] According to (1) preparation of base membrane, (2) preparation of homogeneous modified impregnation solution, (3) impregnation and calcination of base membrane to prepare glass hollow fiber membrane, wherein:
[0020] (1) Preparation of the base membrane: The glass hollow fiber membrane green body is prepared by immersion precipitation phase inversion method, then dried and calcined at high temperature to form the green membrane body, and then corroded with acid to form holes on the inner and outer surfaces of the membrane wall to obtain a The glass hollow fiber base membrane with a symmetrical pore structure has a bimodal distribution of pore diameters of 80-100 μm and 1-5 nm.
[0021] (2) Preparation of homogeneously modified impregnating solution: Weigh each component according to the ratio of 5% sodium carbonate, 5% boric acid, 15% tetraethyl orthosilicate, 8% polyvinyl alcohol and 67% water by mass fraction , Add sodium carbonate, boric acid, and ethyl orthosilicat...
Embodiment 2
[0024] According to the steps in Example 1, the preparation of the base membrane, the preparation of the homogeneously modified impregnation solution, the impregnation and calcination of the base membrane to prepare the glass hollow fiber membrane, the difference is that the pore diameter of the glass hollow fiber base membrane is 80-90 μm and 7-7 μm. 10nm bimodal distribution; the proportion of each component in the homogeneously modified impregnation solution is: sodium sulfate 8%, sodium borate 12%, tetraethyl orthosilicate 20%, polyvinyl alcohol 6% and water 54%, each component The temperature at the time of dissolution is 60°C; the time for the sodium borosilicate glass base film to stay in the impregnation solution is 5s, the drying temperature in the oven is 80°C, and the drying time is 3h, and then repeat the impregnation and drying process once more. The heating rate is 5°C / min. First, keep at 500°C for 2 hours, then raise the temperature to 900°C at a rate of 8°C / min,...
Embodiment 3
[0026] According to the steps in Example 1, the preparation of the base membrane, the preparation of the homogeneously modified impregnation solution, the impregnation and calcination of the base membrane to prepare the glass hollow fiber membrane, the difference is that the pore size of the glass hollow fiber base membrane is 10-30 μm and 1-30 μm. 8nm bimodal distribution; the proportion of each component in the homogeneous modified impregnation solution is: sodium nitrate 3%, sodium borate 10%, tetraethyl orthosilicate 17%, polyvinyl alcohol 7% and water 63%, each component The temperature when dissolving is 90°C; the time for the sodium borosilicate glass base film to stay in the immersion solution is 10s, the drying temperature in the oven is 10°C, and the drying time is 24 hours. The heating rate during calcination is 1°C / min. Keep warm for 2h, then raise the temperature to 800°C at a rate of 6°C / min, and keep warm for 2h.
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