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Unsymmetrical network shape pore structure hollow fiber film and preparation method thereof

A fiber membrane and network technology, applied in the production field of hollow fiber membrane, can solve the problems of high working pressure, low membrane flux, membrane damage, etc., and achieve the effect of increasing pore size, uniform membrane formation, and increasing dosage.

Active Publication Date: 2008-05-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weakness of the finger hole is that its mechanical properties are poor and it is difficult to withstand high working pressure
When the impact load is large, the membrane is prone to damage, the separation accuracy is not very high, and the membrane flux is also low.
[0003] When the hollow fiber membrane is prepared by the traditional dry-wet conversion process, the amount of solvent added to the spinning dope is usually large, and the aqueous solution of hydrophilic non-solvent and metal salt is used as the porogen, and the amount is small. This method has the following defects: 1, finger-shaped pores are easily formed in the phase inversion process; 2, the dense layer is thicker; 3, when preparing hollow fiber membranes with larger apertures, low temperatures are required to maintain their spinnability; 4. It is difficult to accurately control the phase inversion process 5. The asymmetry of the pores on the membrane surface is weak

Method used

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  • Unsymmetrical network shape pore structure hollow fiber film and preparation method thereof
  • Unsymmetrical network shape pore structure hollow fiber film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: polysulfone ether 21%, diethylene glycol 45%, N-N dimethylpyrrolidone (NMP) 34%, mix uniformly at 50 ℃, stand at 50 ℃ for vacuum defoaming for 24 hours, spin The raw liquid is transported to the A-type spinneret, the coagulation bath is water, and the core liquid is water. Control the spinning speed to 15m / min, wash the membrane silk with clean water, and after heat treatment, the inner diameter is 0.8mm, the outer diameter is 1.3mm, the test retention rate of ovalbumin solution is 97.5%, and the pure water flux is 400L / m 2 .h(0.1MPa). The average pore diameter of the outer layer of the membrane is 250 μm (SEM method). The support layer is a network of through holes. The average pore diameter of the inner surface layer is 25nm (AFM method).

Embodiment 2

[0032] Embodiment 2: polysulfone ether (Amoco) 19%, diethylene glycol (Mitsubishi Corporation of Japan) 46%, N-N dimethylpyrrolidone (NMP) 34%, mix uniformly at 50 ℃, stand vacuum at 50 ℃ After defoaming for 24 hours, the spinning dope is transported to the B-type spinneret, the coagulation bath is water, and the core liquid is a mixed solution of water and NMP. Control the spinning speed at 15m / min, wash with water and heat-treat to obtain an inner diameter of 1.1mm, an outer diameter of 1.6mm, a bovine serum albumin solution test rejection rate of 97.0%, and a pure water flux of 550L / m 2.h(0.1MPa). The average pore diameter of the outer layer of the membrane is 250 μm (SEM method), and the support layer is a network of through holes.

Embodiment 3

[0033] Embodiment 3: 20% of polysulfone ether, 46% of diethylene glycol, 34% of N-N dimethylpyrrolidone (NMP), mixed uniformly at 50°C, left standing at 50°C for vacuum defoaming for 24 hours, spinning The raw liquid is sent to the B-type spinneret, the coagulation bath is water, and the core liquid is water. Control the spinning speed to 15m / min, wash with water, and after heat treatment, the inner diameter is 1.1mm, the outer diameter is 1.6mm, the retention rate of ovalbumin solution is 96.5%, and the pure water flux is 450L / m 2 .h(0.1MPa). The average pore diameter of the outer layer of the membrane is 250 μm (SEM method), and the support layer is a network of through holes. The average pore diameter of the inner surface layer is 25nm.

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Abstract

The invention relates to a production method of a hollow fiber membrane, in particular to a hollow fiber membrane in an asymmetric network pore structure and the preparation method thereof. According to the technical proposal of the invention, the hollow fiber membrane of the asymmetric network pore structure comprises an endodermis, an exodermis and a support layer between the endodermis and the exodermis. The hollow fiber membrane is characterized in that: the hollow fiber membrane is the hollow fiber membrane of an inter compression type with the aperture of the exodermis being 0.5 to 20 times more than that of the endodermis; or the hollow fiber membrane is the hollow fiber membrane of an outside-in type with the aperture of the endodermis being 0.5 to 20 times more than that of the exodermis. The preparation method of the hollow fiber membrane in the asymmetric network pore structure employs a dry-wet spinning process. The hollow fiber membrane prepared by the method is characterized in the high working pressure bearing capacity, good membrane integrity, high membrane flux, high separation accuracy and so on.

Description

technical field [0001] The invention relates to a method for producing a hollow fiber membrane, in particular to a method for preparing a hollow fiber membrane with an asymmetric network-like pore structure. Background technique [0002] Hollow fiber membranes have been widely used in industry due to their advantages of high packing density, low preparation cost, and hydraulic backwashing. The existing technology for preparing hollow fiber membranes refers to the shape-like pore structure, and the asymmetry of the pore diameters of the separation layer and the other skin layer is relatively weak. The weakness of the finger holes is that they have poor mechanical properties and are difficult to withstand high working pressure. When the impact load is large, the membrane is prone to damage, the separation accuracy is not very high, and the membrane flux is also low. [0003] When the hollow fiber membrane is prepared by the traditional dry-wet conversion process, the amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/10
Inventor 孙余凭
Owner JIANGNAN UNIV
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