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Anti-fouling hollow fiber membrane and preparation method thereof

A fiber membrane and anti-pollution technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of product quality decline, membrane flux attenuation, low surface energy, etc., and achieve the reduction of attenuation rate and increase Pollution performance, enrichment reduction effect

Active Publication Date: 2014-01-01
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low surface energy of existing membrane materials, the surface hydrophobicity makes the membrane surface easy to adsorb proteins, colloids, etc., causing or aggravating other pollution phenomena, resulting in attenuation of membrane flux and decline in product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In terms of mass fraction, 2% of sodium polyacrylate with a molecular weight of 500,000 was dissolved in 3% of water, and then mixed with 15% of polyvinylidene fluoride resin, 5% of polyvinylpyrrolidone and 10% of polyethylene glycol 6000 Add it to 65% dimethylacetamide, mix evenly, and remove the air bubbles to obtain the required casting solution.

[0025] The above-mentioned casting solution enters the coagulation bath with a temperature of 70°C and an aqueous solution containing 3% N-methylolacrylamide through the spinneret, and the as-spun silk is obtained after the gelation is completed. The obtained as-spun silk was dried at 100° C. for 3 hours, rinsed with distilled water for 3 times, and then dried to obtain the modified hollow fiber membrane. The pure water flux and decay rate of the obtained hollow fiber membranes were measured. The attenuation rate refers to the percentage of water flux attenuation due to membrane contamination. The attenuation rate test us...

Embodiment 2

[0032] In terms of mass fraction, 1% of sodium polyacrylate with a molecular weight of 200,000 was dissolved in 5% of water, and then 18% of polysulfone resin, 3% of polyvinylpyrrolidone and 9% of polyethylene glycol 20,000 were added to the 64% dimethylformamide, mix evenly, remove air bubbles, and make a casting solution.

[0033] The above-mentioned casting solution enters the coagulation bath with a temperature of 80°C and contains 1% N-methylolacrylamide aqueous solution through the spinneret, and the primary silk is obtained after the gelation is completed. The obtained as-spun silk was dried at 90° C. for 3 hours, rinsed with distilled water for 3 times, and then dried to obtain the modified hollow fiber membrane. After testing, the pure water flux is 513L / ㎡·h, and the attenuation rate is 23.27%.

[0034] Comparative example:

[0035] In terms of mass fraction, add 18% polysulfone resin, 3% polyvinylpyrrolidone and 9% polyethylene glycol 20000 to 70% dimethylformamide...

Embodiment 3

[0038] According to the mass fraction, 3% of sodium polyacrylate with a molecular weight of 50,000 was dissolved in 4% of water, and then added with 20% of polyethersulfone resin, 3% of polyvinylpyrrolidone and 7% of polyethylene glycol 6000 Add it to 63% dimethylacetamide, mix it evenly, remove the air bubbles, and make a casting solution.

[0039] The above-mentioned casting solution enters the coagulation bath with a temperature of 60°C and contains 2% N-methylolacrylamide aqueous solution through the spinneret, and the spun silk is obtained after the gelation is completed. The obtained as-spun silk was dried at 80° C. for 4 hours, rinsed with distilled water for 3 times, and then dried to obtain the modified hollow fiber membrane. After testing, the pure water flux is 613L / ㎡·h, and the attenuation rate is 27.54%.

[0040] Comparative example:

[0041] In terms of mass fraction, add 20% polyethersulfone resin, 3% polyvinylpyrrolidone and 7% polyethylene glycol 6000 to 70%...

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Abstract

The invention discloses an anti-fouling hollow fiber membrane and a preparation method of the anti-pollution hollow fiber membrane, and provides a hollow fiber membrane capable of resisting fouling of colloidal substances and protein, and the preparation method of the hollow fiber membrane. The preparation method comprises the steps of fully mixing 1-3% of sodium polyacrylate and 3-5% of water, then fully mixing 15-20% of a polymer, 63-65% of a film formation solvent and 10-15% of a film formation additive with the above mixture, removing air bubbles to obtain casting film liquid, extruding the casting film liquid by a spinning nozzle, then enabling the casting film liquid to enter a coagulating bath at 60-80 DEG C, drying at 80-100 DEG C after coagulating for certain time, so as to obtain the anti-fouling hollow fiber membrane, wherein the coagulating bath is aqueous solution containing sodium polyacrylate cross-linking agents. The hollow fiber membrane can effectively reduce nonspecific binding of membrane surface and pollutants such as protein and colloid through a hydrophobic bond, and reduces the membrane surface adsorption, so that the membrane flux is relatively stable and the attenuation rate is reduced.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to an anti-pollution hollow fiber membrane and a preparation method thereof. Background technique [0002] Hollow fiber membrane separation technology has become the most concerned core technology in the field of water treatment technology, and its application range is becoming wider and wider. [0003] Due to the low surface energy of existing membrane materials, the surface hydrophobicity makes the membrane surface easy to adsorb proteins, colloids, etc., causing or aggravating other pollution phenomena, resulting in attenuation of membrane flux and decline in product quality. Therefore, membrane fouling has always been one of the most important reasons restricting the application and development of membrane technology. It not only affects the use efficiency of hollow fiber membranes, but also seriously restricts the service life of hollow fiber membranes. How to improve the ant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/08B01D69/02B01D67/00
Inventor 胡晓宇李洪港梁义孙文挺
Owner TIANJIN MOTIMO MEMBRANE TECH
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