A nanofiltration membrane for water purification and its preparation method and application

A nanofiltration membrane and water purification technology, applied in general water supply conservation, chemical instruments and methods, membranes, etc., can solve the problem that the removal rate of high-valent salt and heavy metal ions cannot meet the requirements, the bonding force between porous base membrane and desalination layer is weak, performance degradation and other problems, to achieve excellent light transmittance, excellent pollution resistance, and reduce the effect of internal concentration polarization

Active Publication Date: 2021-10-01
美蓝飘尔(上海)过滤设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, TFC nanofiltration membranes mainly have problems such as weak bonding between the porous base membrane and the desalination layer, thick desalination layer and prone to defects, resulting in low permeate flux and insufficient removal rates of high-priced salts and heavy metal ions. According to the requirements, long-term operation of the membrane is prone to performance attenuation and deterioration, poor pollution resistance, no antibacterial properties, etc.

Method used

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  • A nanofiltration membrane for water purification and its preparation method and application
  • A nanofiltration membrane for water purification and its preparation method and application

Examples

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Embodiment 1

[0050] This embodiment is a nanofiltration membrane used for water purification, including a modified PVB porous base membrane and an ultra-thin polyamide desalination layer formed by reaction on one side of the PVB porous base membrane.

[0051] As a preferred embodiment, the molecular weight of the PVB, that is, polyvinyl butyral, is between 25,000 and 200,000, wherein the content of butyral is 65-88%, and the content of alcoholic hydroxyl groups is 11-27%. More preferably, the molecular weight of PVB is between 100,000 and 150,000, and the alcoholic hydroxyl content is 24-27%.

[0052] As another preferred embodiment, the modified PVB porous base membrane is an aminated PVB porous base membrane. More preferably, the aminated PVB porous base film is obtained by acyl chlorination of the PVB porous base film, and then through an amination reaction; wherein the PVB porous base film is The sponge pore structure with high porosity has an average pore diameter of 0.01-0.65 μm, an...

Embodiment 2

[0055] This embodiment is a method for preparing a nanofiltration membrane for water purification, comprising the following steps:

[0056] S1, configure polyvinyl butyral casting solution: configure PVB casting solution according to PVB 5-40wt%, solvent 50-85wt%, porogen 1-20wt%, at first the porogen is completely dissolved in the solvent, Then add PVB, stir and heat to dissolve to form a completely dissolved casting solution, let it stand for degassing for later use, and obtain the prepared PVB casting solution;

[0057] S2. Preparation of PVB porous base membrane: Extrude the prepared PVB casting solution to spin the hollow fiber nascent membrane filament, control the phase transformation of the nascent membrane filament, solidify the membrane filament from the liquid phase, and then wind the membrane filament on the On the film machine;

[0058] Put the PVB membrane in water to further dissolve the solvent and porogen in the membrane completely, and then freeze-dry the PV...

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Abstract

The invention discloses a nanofiltration membrane used for water purification, a preparation method and application thereof. The nanofiltration membrane comprises a modified PVB porous base membrane and a polyamide ultra-thin desalination layer formed by reaction on one side surface of the modified PVB porous base membrane. The polyamide ultra-thin desalination layer and the PVB porous base membrane are combined by chemical bonds, so that the base membrane and the polyamide separation layer are firmly bonded and the separation layer is complete and free of defects, which solves the problem of the current nanofiltration membrane. The problem of weak binding force caused by simple adhesion combination avoids the degradation of membrane performance such as separation layer defects, shedding, and delamination of the nanofiltration membrane due to operating pressure fluctuations, flow rate changes, and cleaning during long-term operation. or failure issues. The nanofiltration membrane of the present invention has good hydrophilicity, high water flux, double-effect heavy metal removal ability and antibacterial property, excellent swelling resistance and pollution resistance, stable long-term use performance, and is suitable for water purification equipment requiring high filtration accuracy. Especially household water purification equipment.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and relates to a nanofiltration membrane used for water purification, a preparation method and application thereof. Background technique [0002] The filtration membrane technologies used in water purification equipment mainly include microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Among them, the nanofiltration membrane is a separation membrane with a pore size between the reverse osmosis membrane and the ultrafiltration membrane. It has a high rejection rate for divalent and high-valent ions and organic substances with a relative molecular mass greater than 200. It has broad application prospects in water desalination, sewage treatment and biopharmaceuticals and other fields. [0003] In the field of household water purification, compared with reverse osmosis membrane technology, nanofiltration membrane technology has low operating pressure and can ret...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/08B01D69/02B01D67/00C02F1/44C02F101/20
CPCB01D67/0013B01D69/02B01D69/08B01D71/56B01D2325/48C02F1/442C02F2101/20Y02A20/131
Inventor 肖通虎郭恭兵丁春宏段飞
Owner 美蓝飘尔(上海)过滤设备有限公司
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