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Composite hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of polymer material preparation, can solve the problems of poor pollution resistance, low flux, low mechanical strength, etc., and achieve the effects of pollution-resistant cleaning, fast flux decay, and good mechanical properties.

Active Publication Date: 2015-07-22
5ELEM HI TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention designs a composite hollow fiber membrane, which solves the problems of low mechanical strength, poor pollution resistance and small flux of the current hollow fiber membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of composite hollow fiber membrane comprises the following steps:

[0029] Step 1: Prepare the casting solution by stirring and blending 13% of the polymer material, 75% of the solvent, 2% of the additive and 10% of the chemical reaction porogen at a temperature of 60°C for 12 hours, and standing at a constant temperature of 60°C to remove Soak for 25 hours to obtain a homogeneous casting solution; the polymer material is a mixture of cyanoethyl cellulose, cellulose xanthate and polyethersulfone in a mass ratio of 20:20:6, and the solvent is N-methylpyrrolidone and sulfolane in a mass ratio of 3:1, the additive is a mixture of lauryl amidopropyl amine oxide, polymethyl methacrylate, and zinc chloride in a mass ratio of 1:5:3, and the chemical reaction causes The pore agent is a mixture of methylcellulose, titanium dioxide, and aluminum oxide at a mass ratio of 5:2:2.

[0030] Step 2: prepare the core liquid and the outer gel bath; the composition...

Embodiment 2

[0034] The preparation method of composite hollow fiber membrane comprises the following steps:

[0035] Step 1: Prepare the casting solution by stirring and blending 27% of the polymer material, 60% of the solvent, 5% of the additive and 8% of the chemical reaction porogen at a temperature of 60°C for 18 hours, and standing at a constant temperature of 70°C to remove Soak for 36 hours to obtain a homogeneous casting solution; the polymer material is a mixture of cyanoethyl cellulose, cellulose xanthate and polyethersulfone in a mass ratio of 20:20:15, and the solvent is N-methylpyrrolidone and sulfolane in a mass ratio of 3:1, the additive is a mixture of lauryl amidopropyl amine oxide, polymethyl methacrylate, and zinc chloride in a mass ratio of 1:5:3, and the chemical reaction causes The pore agent is a mixture of methylcellulose, titanium dioxide, and aluminum oxide at a mass ratio of 5:2:2.

[0036] Step 2: preparing core liquid and outer gel bath; the composition of th...

Embodiment 3

[0040] The preparation method of composite hollow fiber membrane comprises the following steps:

[0041] Step 1: Prepare the casting solution by stirring and blending 18% of the polymer material, 68% of the solvent, 7% of the additive and 7% of the chemical reaction porogen at a temperature of 65°C for 16 hours, and standing at a constant temperature of 65°C to remove Soak for 28 hours to obtain a homogeneous casting solution; the polymer material is a mixture of cyanoethyl cellulose, cellulose xanthate and polyethersulfone in a mass ratio of 20:20:10, and the solvent is N-methylpyrrolidone and sulfolane in a mass ratio of 3:1, the additive is a mixture of lauryl amidopropyl amine oxide, polymethyl methacrylate, and zinc chloride in a mass ratio of 1:5:3, and the chemical reaction causes The pore agent is a mixture of methylcellulose, titanium dioxide, and aluminum oxide at a mass ratio of 5:2:2.

[0042]Step 2: preparing core liquid and outer gel bath; the composition of the...

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PUM

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Abstract

The invention relates to a composite hollow fiber membrane. The composite hollow fiber membrane is characterized by comprising the following steps: preparing a membrane casting solution; preparing a core solution and an outer gel bath; utilizing a dry-wet spinning device to inject the core solution and the membrane casting solution into a spinneret together for hollow fiber spinning, and extruding from the spinneret together to prepare a hollow fiber membrane wire; and enabling the hollow fiber membrane wire obtained in the step to pass a dry spinning path of 0-35cm and sequentially enter a first gel bath and a second gel bath for gel phase inversion to form the high polymer hollow fiber porous membrane with a microprous pore canal. The composite hollow fiber membrane prepared by the method disclosed by the invention is a hydrophilic hollow membrane material and has higher membrane flux and good pollution resistance at low pressure; simultaneously, the hollow fiber membrane has better mechanical strength due to the complementary property of the raw materials.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, in particular to a composite hollow fiber membrane with high strength and high flux. Background technique [0002] Hollow fiber membranes are mainly used for filtration or dialysis in various fields. The composite membrane design can be used to study and select the separation composite layer membrane material and base membrane material, and it is easy to obtain a separation membrane with high separation function and high permeation flux. Therefore, composite membrane technology has become one of the high-function separation membrane preparation technologies. important direction of development. [0003] An important problem in the practical application of ultrafiltration membranes is that membrane fouling leads to a significant attenuation of membrane permeation flux. The anti-fouling properties of membrane materials can be improved by charge modification or hydrophilic modification, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/12
Inventor 张民
Owner 5ELEM HI TECH CORP
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