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Process for preparing composite hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of preparation of hydrophilic composite hollow fiber porous membrane, can solve the problems of narrow selection range of composite materials and solvents, failure to obtain high permeation flux, difficult control of separation pore size, etc., to achieve The effect of easy membrane separation pore size, high membrane strength and membrane separation function, and excellent anti-fouling performance

Active Publication Date: 2008-09-10
江苏美能膜材料科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The selection range of composite materials and solvents is narrow; 2. The post-treatment process requires high requirements; 3. The separation pore size is not easy to control
The rupture strength of the product obtained by this method is insufficient, and the penetration rate of pure water is relatively slow, which cannot meet the needs
[0008] (2) In Japanese Patent Publication 3-71168, it is recorded that the preparation method of adding 7.2wt% polyethylene glycol as a pore-forming agent, but still fails to obtain a membrane with high permeation flux
However, the disadvantage of this method is still that it is not easy to obtain high-strength, high-flux membrane products.

Method used

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  • Process for preparing composite hollow fiber membrane
  • Process for preparing composite hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Stir 500 grams of calcium carbonate 2 micron particles at high speed, and evenly disperse them in 5 kg of dimethylacetamide, then add 2 kg of dimethylacetamide, 2 kg of polyvinylidene fluoride resin, 500 grams of polyethylene glycol, 100 KTW-20, stir and dissolve evenly, and make hollow fiber composite layer spinning solution. 7 kg of dimethylacetamide, 2 kg of polyethersulfone resin, and 500 g of polyethylene glycol were stirred and dissolved evenly to prepare a hollow fiber base membrane spinning solution. Using the dry-wet hollow fiber spinning process, the two kinds of spinning stock solution and core solution (the core solution is 70v% DMA aqueous solution) are simultaneously extruded through the composite spinning nozzle, and drawn on the winding wheel through the external coagulation bath tank , forming a composite hollow fiber. The coagulant in the external coagulation bath is water. Calcium carbonate in polyvinylidene fluoride hollow fiber is removed by hydro...

Embodiment 2

[0067] Mix 500 grams of aluminum oxide 20-80 nanometer particles at high speed, and evenly disperse them in 7 kilograms of N-methylpyrrolidone solvent, then add 2 kilograms of polyvinylidene fluoride resin, 500 grams of polyvinyl pyrrolidone, 100 grams of soil temperature- 80, stir and dissolve evenly, and make hollow fiber cortex spinning solution. 7 kg of dimethylacetamide, 2 kg of polyethersulfone resin, and 500 g of polyethylene glycol were stirred and dissolved evenly to prepare a spinning solution for the hollow fiber support layer. Using the dry-wet hollow fiber spinning process, the two kinds of spinning stock solution and core solution (the core solution is 70v% DMA aqueous solution) are simultaneously extruded through the composite spinning nozzle, and drawn on the winding wheel through the external coagulation bath tank , forming a composite hollow fiber. The coagulant in the coagulation bath is water. Use NaOH aqueous solution to remove Al2O3 in polyvinylidene fl...

Embodiment 3

[0070] Stir 800 grams of calcium carbonate 2 micron particles at high speed, and evenly disperse them in 5 kg of dimethylacetamide, then add 1.8 kg of dimethylacetamide, 1.8 kg of polyvinylidene fluoride resin, 780 grams of polyvinylpyrrolidone, 20 grams Fluorine FC-4, stir and dissolve evenly, and make hollow fiber cortex spinning solution. 7 kg of dimethylacetamide, 2 kg of polyethersulfone resin, and 500 g of polyethylene glycol were stirred and dissolved evenly to prepare a spinning solution for the hollow fiber support layer. Using the dry-wet hollow fiber spinning process, the two kinds of spinning stock solution and core liquid water are simultaneously extruded through the composite spinning nozzle, passed through the external coagulation bath, and drawn on the winding wheel to form a composite hollow fiber. The coagulant in the coagulation bath is water. Calcium carbonate in polyvinylidene fluoride hollow fibers was removed with hydrochloric acid solution. Under the ...

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Abstract

A preparation of composite hollow fiber membrane adopts solution phase transfer hollow fiber spinning process, makes poly(ethylene terephthalate) or polysulfone, solvent and pore-forming agent into a base membrane spinning solution of composite hollow fiber membrane, makes polyvinylidene fluoride or other copolymers or mixture of same, solvent and pore-forming agent into composite layer spinning solution of composite hollow fiber membrane and simultaneously extrudes the said two spinning solution and core solution in the hole of the spinneret central pipe through the spinneret for outside condensation bath. The solvents and pore-forming agents in the two kinds of spinning solutions prepared in said step (1) and (2) enters condensation solution phase and the polymers, as the composite layer and the base membrane materials, precipitates into polymer hollow fiber membrane due to phase transfer, producing high-strength and high-flux hydrophilic composite hollow fiber membrane.

Description

technical field [0001] The invention relates to a preparation method of a composite hollow fiber membrane, in particular to a preparation method of a high-strength, high-throughput hydrophilic composite hollow fiber porous membrane. 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] This technology was first developed and applied to reverse osmosis membrane and gas separation membrane system. An important problem in the practical application of ultrafiltration membranes is that membrane fouling leads to a si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D69/12B01D71/34B01D71/68
Inventor 葛海霖
Owner 江苏美能膜材料科技有限公司
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