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Hollow fiber ultrafilter membrane and its preparation method

An ultrafiltration membrane and fiber technology, applied in the field of membrane separation, can solve the problems of high daily maintenance, high water treatment cost, and high hydrophobicity, and achieve the effect of reducing daily nursing times, reducing water treatment costs, and enhancing mechanical strength.

Inactive Publication Date: 2012-06-13
CHONGQING DELING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art discloses a variety of polymer materials that can be used to make hollow fiber membranes, including polysulfone, polyacrylonitrile, polyvinylidene fluoride, polyethersulfone, etc., but these materials have the following problems when used to make hollow fiber membranes : The material itself has high hydrophobicity, and the prepared hollow fiber membrane has poor hydrophilicity, is easily polluted, and the flux attenuation speed is fast; the prepared hollow fiber membrane has low mechanical strength, and is prone to breakage during application. The situation of hollow fiber membranes caused problems such as short service life of hollow fiber membranes, high frequency of daily maintenance, and high cost of water treatment.
The enhanced hollow fiber membrane has high mechanical strength and membrane flux, but its preparation method is complicated, the coating on the surface of the non-woven tube is uneven, and the coating has poor adhesion, easy to fall off, and is not durable The backwashing process during the running time is not conducive to its application in the water treatment process

Method used

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Effect test

preparation example Construction

[0036] The present invention also provides a kind of preparation method of hollow fiber ultrafiltration membrane, comprises the following steps:

[0037] Fully mix the film-forming polymer, meta-aramid fiber, pore-forming agent and solvent, and defoam to obtain the casting solution;

[0038] The casting solution is extruded through a spinning head, and after being shaped, a hollow fiber ultrafiltration membrane is obtained.

[0039] In the invention, the film-forming polymer, the meta-aramid fiber, the pore-forming agent and the solvent are fully mixed to obtain the mixture. In the present invention, the mixture is preferably stirred at 50°C to 90°C, more preferably at 55°C to 85°C, preferably for 3h to 10h, more preferably for 4h to 8h, so that the film-forming polymer, meta-aramid fiber and forming Pore ​​agent fully dissolved. After fully dissolving, the present invention preferably keeps the obtained mixture at a constant temperature, the temperature of the constant temp...

Embodiment 1

[0052] Add 100g PVDF, 100gPES, 20g aramid fiber (DuPont Nomex), 60g ethylene glycol methyl ether, 30g lithium chloride and 690g N, N-dimethylacetamide into the reaction kettle to obtain a mixture; Heating and stirring for 5 hours, after dissolving evenly, defoaming under vacuum conditions for 4 hours to obtain the casting solution; the casting solution is extruded through the spinning nozzle under the pressure of 0.35MPa, stays in the air for 2s~3s and then enters 25℃ The pure water coagulation bath is taken out after soaking for 48 hours; the obtained product is washed with clear water, then surface treated in a glycerol aqueous solution with a mass concentration of 40%, soaked for 12 hours, and dried to obtain a hollow fiber ultrafiltration membrane.

[0053] The outer diameter of the hollow fiber membrane is 1.5 mm, the inner diameter is 0.8 mm, the porosity is 72%, and the contact angle is 53°.

[0054] The performance test of the hollow fiber ultrafiltration membrane show...

Embodiment 2

[0056] Add 100g of PVDF, 100g of PAN, 20g of aramid fiber (Teijin Conex), 70g of ethylene glycol methyl ether, 30g of lithium chloride and 680g of N, N-dimethylformamide into the reactor to obtain a mixture; place the mixture at 80°C Heating and stirring for 5 hours, after dissolving evenly, defoaming under vacuum conditions for 4 hours to obtain the casting solution; the casting solution is extruded through the spinning nozzle under the pressure of 0.35MPa, stays in the air for 2s~3s and then enters 25℃ The pure water coagulation bath is taken out after soaking for 48 hours; the obtained product is washed with clear water, and then surface treated in a glycerol aqueous solution with a mass concentration of 40%, soaked for 24 hours, and dried to obtain a hollow fiber ultrafiltration membrane.

[0057] The outer diameter of the hollow fiber membrane is 1.5 mm, the inner diameter is 0.8 mm, the porosity is 74%, and the contact angle is 50°.

[0058] The performance test of the h...

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Abstract

The invention provides a hollow fiber ultrafilter membrane, which is obtained by a following mixture after film forming treatment: 14wt%-25wt% of film forming polymer, 0.1wt%-15wt% of meta aramid fiber, 6wt%-10wt of pore forming agent and 59wt%-80wt% of solvent. The invention also provides a preparation method of the hollow fiber ultrafilter membrane. The meta aramid fiber possesses high strength, and enables mutual interpenetration of different polymer chains, is capable of enhancing the mechanical strength of the film forming polymer, so that the hollow fiber ultrafilter membrane possesses high mechanical strength without wire facture, thereby the service life can be prolonged, the daily maintenance frequency can be minimized, and the water treatment cost can be reduced; The meta aramid fiber can increase the hydrophilic performance of the hollow fiber ultrafilter membrane, so that the contamination resistance is good, the flux is high and the attenuation speed is slow. The meta aramid fiber can enhance the heat resistance of the hollow fiber ultrafilter membrane and is more suitable for usage under rigorous condition.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a hollow fiber ultrafiltration and a preparation method thereof. Background technique [0002] Hollow fiber membrane is a kind of fibrous, self-supporting membrane, which is a kind of non-pair membrane. Hollow fiber membranes have the advantages of high packing density, small footprint, large flux, and low energy consumption, and are widely used in separation processes in water treatment, pharmaceuticals, brewing, catering, food, and chemical industries. [0003] The prior art discloses a variety of polymer materials that can be used to make hollow fiber membranes, including polysulfone, polyacrylonitrile, polyvinylidene fluoride, polyethersulfone, etc., but these materials have the following problems when used to make hollow fiber membranes : The material itself has high hydrophobicity, and the prepared hollow fiber membrane has poor hydrophilicity, is e...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00
Inventor 任以伟
Owner CHONGQING DELING TECH
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