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

Active Publication Date: 2016-02-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses organosilane grafting to modify the pore wall of the glass membrane. Due to the poor interface compatibility between organosilane and glass membrane, the graft modification rate is not easy to guarantee, so the performance of the membrane is also unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a preparation method of a homogeneous modified sodium borosilicate glass hollow fiber membrane. The preparation method adopts the following process: 1, preparing a basilar membrane: preparing a sodium borosilicate glass hollow fiber basilar membrane by a process of immersion precipitated phase inversion, calcination and acid corrosion; 2, preparing homogeneous modified steeping liquor which comprises the following components in parts by mass: 3 to 8 parts of sodium salt, 5 to 20 parts of boron-containing compound, 10 to 20 parts of tetraethoxysilane, 2 to 8 parts of polyvinyl alcohol and 50 to 70 parts of water: mixing the components, heating by water bath at 20 to 90 DEG C, and obtaining the homogeneous modified steeping liquor after stirring; 3, steeping and calcining the basilar membrane: placing the sodium borosilicate glass hollow fiber basilar membrane in the steeping liquor, drying after taking out, then repeating the process of steeping and drying, finally putting into a high-temperature furnace, controlling the heating rate and heat preservation time, and obtaining the homogeneous modified sodium borosilicate glass hollow fiber membrane by cooling along with the furnace.

Description

technical field [0001] The invention relates to a method for preparing a glass hollow fiber membrane, in particular to a method for preparing a homogeneously modified sodium borosilicate glass hollow fiber membrane. Background technique [0002] Glass hollow fiber separation membrane is an inorganic separation membrane material. As a self-supporting separation membrane material, it has the advantages of good high temperature stability, acid corrosion resistance, easy cleaning and good mechanical stability. It can be used in water separation, gas separation and other fields, and has great market potential and development space. . [0003] Crystallization and acid leaching method is a preparation method of glass hollow fiber membranes. Usually, quartz sand, boric acid, and soda ash are used as main raw materials, which are melted at 1400-1500°C to obtain hollow fiber glass tubes, and then heated at 550-850°C. The phase separation heat treatment is carried out under the glass...

Claims

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Application Information

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IPC IPC(8): B01D71/04B01D69/08B01D69/02B01D67/00
Inventor 张亚彬徐佳伟王永健肖长发
Owner TIANJIN POLYTECHNIC UNIV
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