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Preparation method of high-temperature-hole-forming glass hollow fiber membrane

A fiber membrane and hollow technology, which is applied in the field of glass hollow fiber membrane preparation, can solve the problems of membrane performance degradation, porosity decrease, glass melting, etc., achieve permeation flux and separation performance improvement, reduce production cost, and lower calcination temperature Effect

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, the disadvantage of this method is that the pore structure of the membrane is formed when the green membrane is soaked in water, and the calcination is the process after the green membrane is formed. The pore forming process and the calcination process are not completed at the same time, which is easy. When the glass is melted during calcination, once the molten glass is filled into the pores, the porosity will be significantly reduced, thereby reducing the permeation flux of the membrane and reducing the performance of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to (1) preparation of casting solution, (2) spinning, (3) drying of membrane green body and calcination to make holes to prepare glass hollow fiber membrane, wherein:

[0019] (1) First, wet the glass powder and calcium carbonate in a ball mill for 12 hours, and pass through a 200-mesh sieve after drying to obtain d 50 =1μm solid fine powder. Then polyvinylidene fluoride and N,N-dimethylacetamide with a mass ratio of 8:92 were mixed and stirred for 4 hours to obtain a uniform polymer solution. Add the sieved solid micropowder into the polymer solution, and mechanically stir for 6 hours. The mass ratio of the solid micropowder to the polymer solution is 30:70, and a uniformly dispersed casting solution is obtained.

[0020] (2) Transfer the casting solution to the material tank of the spinning machine, let it stand for degassing for 4 hours, and then, under the pressure of 100KPa nitrogen, let the casting solution enter the water at 50°C through the spinneret,...

Embodiment 2

[0023] According to the steps in Example 1, the casting solution was prepared, spinning, drying and calcining were carried out to form pores, except that the carbonate pore-forming agent used was magnesium carbonate. The particle size of the solid micropowder obtained after ball milling and sieving is d 50 = 5 μm. The polymer is polyvinyl chloride, the solvent is dimethyl sulfoxide, and the mass ratio of polyvinyl chloride to dimethyl sulfoxide is 12:88. The solid micropowder is mixed with the polymer solution to obtain the casting liquid, and its mass ratio is 40:60. The static degassing time is 6 hours, the spinneret core fluid is 50°C deionized water, the coagulation bath is 40°C water, and the green film is soaked in 20°C water for 48 hours. During the sintering process, heat up at 5°C / min, hold at 600°C for 1 hour, then raise the temperature at a rate of 9°C / min to 900°C and hold for 1 hour to decompose magnesium carbonate, and then cool to room temperature with the furna...

Embodiment 3

[0025] According to the steps in Example 1, the casting solution was prepared, spinning, drying and calcining were used to form pores, except that the carbonate pore-forming agent used was a mixture of calcium carbonate and magnesium carbonate in any proportion. The particle size of the solid micropowder obtained after ball milling and sieving is d 50 = 8 μm. The polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, and the mass ratio of polyacrylonitrile to N,N-dimethylformamide is 20:80. The solid micropowder is mixed with the polymer solution to obtain the casting liquid, and the mass ratio thereof is 50:50. The standing degassing time is 8 hours, the spinneret core fluid is 60°C deionized water, the coagulation bath is 30°C water, and the green film is soaked in 10°C water for 36 hours. During the sintering process, heat up at 4°C / min, hold at 400°C for 1 hour, then raise the temperature at a rate of 10°C / min to 1000°C and hold for 1 hour to decompose calci...

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Abstract

The invention relates to a preparation method of a high-temperature-hole-forming glass hollow fiber membrane. Firstly glass powder and a carbonate hole forming agent are mixed and subjected to ball milling to obtain solid micro powder of the particle size of 0.1 to 10 [mu]m. Then a polymer solution is prepared, and the screened solid micro powder is added into the polymer solution, and a casting membrane solution is obtained by stirring the solid micro powder so as to disperse uniformly. The casting membrane solution is subjected to standing and defoaming treatment, and is then extruded via a spinning nozzle under the action of nitrogen pressure; the casting membrane solution enters a coagulating bath to obtain a glass hollow fiber membrane green body, and the green body is soaked in water so that an organic solvent is sufficiently dissolved in the water. The hollow fiber membrane green body is dried and then subjected to a high-heat treatment process, so that the carbonate hole forming agent is decomposed to obtain the glass hollow fiber membrane. The preparation method is simple in process, in need of no expensive equipment and low in sintering temperature, can realize the high-temperature hole forming of the glass hollow fiber membrane, and can adjust the porosity according to the using amount of the carbonate hole forming agent, and the glass hollow fiber membrane provided by the invention can be used in the fields such as hydro dissection.

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 glass hollow fiber membrane with high-temperature hole making. Background technique [0002] Compared with other membrane separation materials, the hollow fiber membrane has the advantages of large specific surface area and high packing density, and the hollow fiber membrane can be divided into organic membrane, inorganic membrane and composite membrane according to the composition. The glass hollow fiber membrane material belongs to an inorganic separation membrane. 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] At present, the main preparation method of glass hollow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/04
Inventor 张亚彬徐佳伟潘光友王永健肖长发
Owner TIANJIN POLYTECHNIC UNIV
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