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Polysulfonate separation membrane and preparation method thereof

A technology of polysulfone and separation membranes, which is applied in the field of separation membranes, can solve the problems that the membrane performance is difficult to be significantly improved, and the structure of wet-process membranes is difficult to control, etc., and achieves the effects of easy industrial scale production, low-cost realization, and simple process

Inactive Publication Date: 2015-03-25
陈顺权
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] It can be seen from the above that in the prior art, the structure of the wet membrane is difficult to control, and the performance of the prepared membrane is difficult to be significantly improved.

Method used

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  • Polysulfonate separation membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Mix the mixture of polyethersulfone, dimethylformamide, acetic acid and glycerin (the mass ratio of acetic acid and glycerol is 1:1) and PVPK30 according to the mass ratio of 15:60:12:13, and stir in an oil bath at 85°C for 24 Hours to prepare a clear and transparent solution, reduce the stirring speed and continue to stir for 2 hours to defoam. Control the humidity of the scraping film atmosphere to be stable at 55%, set the gap between the blades of the flat-panel scraping machine to 0.2 microns, spread the prepared casting solution on the side of the glass substrate, start the flat-panel scraping machine, and set the scraper at a speed of 100mm / s Speed ​​operation, after the scraper stops running, stay in the air for 25s, and then transfer to 0.1mol / L sodium bicarbonate aqueous coagulation bath to prepare polyethersulfone flat membrane, rinse in pure water for 48 hours, every 2 -Change the water once every 5 hours, then soak in a mixed solution of NaOH, citric acid a...

Embodiment 2

[0038] Mix polysulfone, dimethylacetamide, and PEG6000 at a mass ratio of 18:68:15, stir in an oil bath at 60°C for 24 hours to prepare a clear and transparent solution, reduce the stirring speed and continue stirring for 2 hours to defoam, then add dropwise Hydrochloric acid until the pH of the casting solution is between 4-5, at this time the mass ratio of polysulfone, dimethylacetamide, PEG6000, and hydrochloric acid in the casting solution is 17:66:14:3. Control the humidity of the scraping film atmosphere to be stable at 100%, set the gap between the blades of the flat-panel film-hanging machine to 0.5 microns, spread the prepared casting liquid on the side of the glass substrate, start the flat-panel film-scraping machine, and the scraper at a speed of 100mm / s Speed ​​operation, after the scraper stops running, stay in the air for 1min, then transfer to 0.1mol / L sodium bicarbonate aqueous coagulation bath, prepare polyethersulfone flat membrane, rinse in pure water for 48...

Embodiment 3

[0040] Mix polyethersulfone, methylpyrrolidone, and butyric acid in a mass ratio of 20:75:5, stir in an oil bath at 30°C for 24 hours to prepare a clear and transparent solution, reduce the stirring speed and continue stirring for 2 hours to defoam, and then transfer to the cast film Add isopropanol drop by drop to the solution, and monitor the viscosity change of the casting solution in real time, stop adding until the viscosity of the casting solution reaches a minimum value, at this time, polyethersulfone, methylpyrrolidone, butyric acid and The mass ratio of propanol is 17:66:5:12. Control the humidity of the scraping film atmosphere to be stable at 55%, set the gap between the blades of the flat-panel scraping machine to 0.2 microns, spread the prepared casting solution on the side of the glass substrate, start the flat-panel scraping machine, and set the scraper at a speed of 100mm / s Run at high speed, transfer to 0.1mol / L sodium bicarbonate aqueous coagulation bath imme...

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Abstract

The invention discloses a polysulfonate separation membrane and a preparation method thereof. Casting solution of the polysulfonate separation membrane is prepared from the following components in mass ratio: the mass ratio of membrane preparation raw material, solvent, nonsolvent and modified additive is (10-20):(50-85):(5-25):(0-15). The preparation method of the polysulfonate separation membrane comprises the following steps: preparing the casting solution; preparing the membrane by a nonsolvent-induced phase separation method, solidifying in a coagulating bath, rinsing and drying. In the preparation process of the polysulfonate separation membrane, the casting solution, the coagulating bath, the temperature of the environment atmosphere, the environment humidity and the standing time can be accurately controlled to realize a spongy gradient structure of membrane pores. The preparation method of the polysulfonate separation membrane has simple process and can realize industrial scale production.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a polyether separation membrane and a preparation method thereof. Background technique [0002] Membrane separation technology uses pressure as the driving force to selectively separate mixed liquids through membrane pore size and surface affinity. Compared with traditional separation methods, membrane separation has high selectivity, low energy consumption, high separation efficiency and convenience. Achieve automation and other advantages. Thermally induced phase separation (thermal method) and non-solvent induced phase separation (wet method) are two common methods for preparing separation membrane materials. The wet spinning process is simple, the process is flexible and controllable, and the energy consumption is low. more widely applied. The structure of the separation membrane prepared by wet method is often inhomogeneous macroporous structure. This inhomogeneous stru...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00B01D69/06B01D69/04B01D69/08
Inventor 涂凯陈顺权樊波杨昌玉
Owner 陈顺权
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