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High-flux low-molecular-retention hollow fiber ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and hollow technology, applied in the field of hollow fiber ultrafiltration membrane preparation, can solve the problems of easily polluted membrane production process, low water flux of ultrafiltration membrane, poor hydrophilicity, etc., to increase pollution resistance, good Low molecular interception effect, effect of reducing adsorption

Pending Publication Date: 2021-09-24
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the ultrafiltration membranes with low molecular weight cut-off are mainly made of polyethersulfone and polysulfone. Due to the hydrophobicity of the material itself, and the existing low molecular weight cut-off ultrafiltration membranes on the market have low water flux and poor hydrophilicity. , easy to be polluted and complex membrane making process, etc., far from meeting the needs of the market

Method used

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  • High-flux low-molecular-retention hollow fiber ultrafiltration membrane and preparation method thereof
  • High-flux low-molecular-retention hollow fiber ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The specific preparation process of the hollow fiber ultrafiltration membrane is operated as follows:

[0042] Step 1: Dissolve the mass fraction of 15 parts of polyether sulfone in N-methylpyrrol, form a homogeneous solution, and 20 parts of a acetyl chloride, a mass fraction of 5 parts of aluminum In N-methylpyrrol, in an 80 ° C, poured into a homogeneous solution, stirred, and the reaction was refluxed for 1 h. The product was washed with secondary distilled water, dried under the oven at 120 ° C for 12 h, and was allowed to give a carboxyl modified polyether sulfone, and a polysulfone resin having a mass fraction was dried at 50 ° C for 3 h.

[0043] Step 2: Pour 60 parts by mass of the dimethylformamide solvent into the reaction kettle, warmed to 70 ° C, heat 0.5 parts of sodium chloride in the reaction (stirred at a stirring frequency of 10 Hz for 20 min, stir After the addition of 18 parts by mass of sorbitic, the mixture was continued, stirred for 30 min, and the ca...

Embodiment 2

[0047] The specific preparation process of the hollow fiber ultrafiltration membrane is operated as follows:

[0048] Step 1: Dissolve 20 parts of the mass particle in N-methylpyrrol, form a phase solution, a acetyl chloride having a mass fraction of 25 parts, a mass fraction of 10 parts of aluminum In N-methylpyrrolene, in a slowly pour in a homogeneous solution at 90 ° C, stir, and the reaction was refluxed for 1 h. The product was washed with secondary distilled water, dried under the oven at 90 ° C for 16 h after filtration, to obtain a carboxylated modified polyether sulfone, spare; a mass fraction of a polyary ether sulfone resin was dried at 100 ° C for 5 h.

[0049] Step 2: Pour 70 parts by mass of N-methylpyrrolidone solvent into the reaction kettle, warmed to 90 ° C, heat 2.5 parts of lithium chloride in the reaction ratio of 10 hours at a stirring frequency of 10 Hz 10 min, stir After the addition of 14.5 parts by mass of the polyethylene glycol 400, the mixture was con...

Embodiment 3

[0053] The specific preparation process of the hollow fiber ultrafiltration membrane is operated as follows:

[0054] Step 1: Dissolve the mass fraction of 17 parts of polyether sulfone in N-methylpyrrolene, form a homogeneous solution, and 22 parts of a acetyl chloride, a mass fraction of 8 parts of aluminum In N-methylpyrrolene, in a slowly poured in a homogeneous solution at 85 ° C, stirred, and the reaction was refluxed for 2 h. The product was washed with secondary distilled water, dried under the oven at 100 ° C for 15 h after filtration, and the carboxylated modified polyether sulfone is obtained; the mass fraud is 40 ° C for 4 h. Stick at 80 ° C.

[0055] Step 2: Pour 62 parts by mass of N-methylpyrrolidone solvent into the reaction kettle, warmed to 80 ° C, after heating, 2 parts by mass of lithium chloride added to the reaction kara, stirred at 10 Hz stirring frequency. 10 min, After stirring, 17 parts by mass of the polyethylene glycol 400, and the mixture of Tween 80 w...

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Abstract

The invention provides a high-flux low-molecular-retention hollow fiber ultrafiltration membrane and a preparation method thereof. A membrane casting solution for preparing the ultrafiltration membrane is mainly prepared from the following raw materials in parts by mass: 15-20 parts of carboxylated modified polyether sulfone, 0.5-2.5 parts of a pore-foaming agent, 60-70 parts of a solvent, 14.5-18 parts of an additive and 10-15 parts of reinforced resin. The modified polyethersulfone is used for preparing the high-flux low-molecular-retention hollow fiber ultrafiltration membrane, so that the hydrophobicity of a polyethersulfone material can be reduced, the adsorption of hydrophobic substances on the surface of the membrane is reduced, the affinity of the membrane to organisms such as microbial bacteria is further reduced, and the pollution resistance of the ultrafiltration membrane is further remarkably improved; the content of the pore-foaming agent is controlled, so that a relatively good low-molecule interception effect is achieved; and finally, an additive is added, a certain proportion is controlled, and hydrophilic groups are introduced into the surface and the interior of the membrane, so that the flux and the lasting anti-pollution performance of the hollow fiber ultrafiltration membrane are improved.

Description

Technical field [0001] The present invention relates to the preparation of hollow fiber ultrafiltration membranes, and in particular, there is a hollow fiber ultrafiltration membrane having a high-throughput low molecule and a preparation method thereof. Background technique [0002] Membrane separation techniques are recognized as being the most effective technical means for safeguarding wastewater resource and protecting drinking water. The hollow fiber membrane is a new type of new film technology product with the fastest, largest, largest output in the field of separation membrane. At present, the hollow fiber membrane technology has become an important common common support of common key technologies such as environmental protection, resource recovery, and new energy industries and traditional industrial upgrading. With the improvement of health standards in my country in recent years, urban sewage and industrial wastewater discharge standards have been continuously improved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/02B01D71/68C02F1/44
CPCB01D69/08B01D69/02B01D71/68C02F1/444
Inventor 许白羽曾凡付钱铖邢喜元王清玉
Owner XINJIANG DELAND
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