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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[0018] Example 1
[0019] The glass hollow fiber membrane was prepared according to the three steps of (1) preparation of base membrane, (2) preparation of homogeneous modified impregnation solution, and (3) impregnation and calcination of base membrane, in which:
[0020] (1) Preparation of base film: Prepare glass hollow fiber membrane green body by immersion precipitation phase inversion method, then dry and high temperature calcination to make the membrane green body shape, and then use acid to corrode the inner and outer surfaces of the membrane wall to form pores to obtain The glass hollow fiber base membrane with symmetrical pore structure has a pore diameter of 80-100 μm and a bimodal distribution of 1-5 nm.
[0021] (2) Preparation of homogenous modified impregnating solution: Weigh the components in proportions of 5% sodium carbonate, 5% boric acid, 15% ethyl orthosilicate, 8% polyvinyl alcohol and 67% water. , Add sodium carbonate, boric acid, and ethyl orthosilicate to 8...
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[0023] Example 2
[0024] According to the steps in Example 1, the preparation of the base membrane, the preparation of the homogeneous 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 80~90μm and 7~ 10nm bimodal distribution; the proportions of the components in the homogeneous modified impregnation solution are: sodium sulfate 8%, sodium borate 12%, ethyl orthosilicate 20%, polyvinyl alcohol 6% and water 54%. The dissolution temperature is 60℃; the soda borosilicate glass base film stays in the immersion solution for 5s, the drying temperature of the oven is 80℃, and the drying time is 3h, and then repeat the immersion and drying process once again. The heating rate is 5°C / min, and the temperature is first kept at 500°C for 2 hours, and then the temperature is raised to 900°C at a rate of 8°C / min for 1 hour.
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[0025] Example 3
[0026] According to the steps in Example 1, the preparation of the base membrane, the preparation of the homogeneous 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 10-30μm and 1~ 8nm bimodal distribution; the proportions of the components in the homogeneous modified impregnation solution are: sodium nitrate 3%, sodium borate 10%, ethyl orthosilicate 17%, polyvinyl alcohol 7% and water 63%, each component The dissolution temperature is 90℃; the soda borosilicate glass base film stays in the immersion solution for 10s, the drying temperature of the oven is 10℃, and the drying is 24h, the heating rate during calcination is 1℃ / min, first at 400℃ Keep the temperature for 2h, then increase the temperature to 800℃ at a rate of 6℃ / min, and keep it for 2h.
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