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A kind of sodium hypochlorite-resistant eptfe hydrophilic membrane and its preparation method and application

A sodium hypochlorite and hydrophilic membrane technology, applied in the field of water treatment, can solve the problems of low water flux, strong mass transfer driving force, and flux decline, and achieve the effects of simple preparation method, prolonging service life, and improving hydrophilicity

Active Publication Date: 2021-07-13
리자오후이
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface energy and strong hydrophobicity of ePTFE, the mass transfer driving force of the fluid passing through the membrane is strong when dealing with the aqueous phase separation system, the energy consumption is large, and the water flux is low; in addition, the surface of the hydrophobic membrane is very easy to adsorb organic matter and Impurities such as proteins will cause concentration polarization, which will seriously pollute the membrane, resulting in a sharp drop in flux. These shortcomings limit the application fields of ePTFE membranes

Method used

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  • A kind of sodium hypochlorite-resistant eptfe hydrophilic membrane and its preparation method and application
  • A kind of sodium hypochlorite-resistant eptfe hydrophilic membrane and its preparation method and application
  • A kind of sodium hypochlorite-resistant eptfe hydrophilic membrane and its preparation method and application

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preparation example Construction

[0030] The preparation method of the above-mentioned sodium hypochlorite-resistant ePTFE hydrophilic membrane may further comprise the steps:

[0031] (1) Soak the ePTFE base film in ethanol for 2 to 5 minutes, then take it out and drain;

[0032] (2) put the obtained ePTFE membrane of step (1) into 1~10wt% hydrophilic polymer solution and soak for 2~5min and then take out and drain;

[0033] (3) Put the obtained ePTFE membrane of step (2) into 1~10wt% bridging agent and 0.1~1wt% potassium hydroxide or sodium hydroxide mixed aqueous solution for 2~5min, take out and drain, put into 90~ Carry out bridging reaction in a heating furnace at 150°C for 5-20 minutes;

[0034] (4) Put the obtained ePTFE membrane of step (3) into 1-10wt% hydrophilic organometallic chelate aqueous solution and soak for 2-5 minutes, then take it out and drain it, and put it into a heating furnace at 90-150°C to react for 5 minutes ~20min;

[0035] (5) washing the ePTFE membrane obtained in step (4) an...

Embodiment A1～A16、 Embodiment B1 and Embodiment C1

[0045] (1) Put the ePTFE base film into an aluminum frame with an internal size of 150mm, fix the four corners with clips, soak it in a water tank with 99.5% ethanol solution, take it out of the water tank after 2 minutes, and drain it Excess water, at this time, it is in a translucent state that can transmit light;

[0046] (2) Soak the obtained ePTFE membrane of step (1) in the water tank that is placed with 1~10wt% hydrophilic polymer solution, shake it several times within 2 minutes, then take it out from the water tank, and drain the excess Moisture, now transparency is the same as after completing step (1);

[0047] (3) Soak the ePTFE membrane that step (2) obtains in the water tank that is put 1~10wt% bridging agent and 0.1~1wt% potassium hydroxide or sodium hydroxide prepared solution, carry out more to it within 2 minutes Shake it once, then take it out from the water tank, and drain the excess water. At this time, the transparency is the same as that after completin...

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Abstract

The invention relates to a sodium hypochlorite-resistant ePTFE hydrophilic membrane, the surface of the ePTFE hydrophilic membrane is covered with a hydrophilic polymer, and the feature is that a hydrophilic organic metal chelate is attached to the surface of the ePTFE hydrophilic membrane. The present invention also relates to the preparation method and application of the ePTFE hydrophilic membrane resistant to sodium hypochlorite. Compared with the prior art, the present invention has the advantages of: through the cross-linking action of the hydrophilic polymer and the bridging agent, the cross-linked hydrophilic layer can be mechanically entangled on the ePTFE membrane surface fibril and node structure, which can Effectively improve the hydrophilicity of the ePTFE membrane; by attaching the hydrophilic organometallic chelate to the surface of the hydrophilic modified ePTFE membrane, it will induce sodium hypochlorite to preferentially attack the hydrophilic organometallic chelate, thereby making ePTFE The membrane maintains hydrophilicity for a long time, prolongs the service life of the filtration membrane, has a simple preparation method, and can realize industrial continuous production.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a sodium hypochlorite-resistant ePTFE hydrophilic membrane and a preparation method and application thereof. Background technique [0002] With the rapid development of industrial economy, the problem of environmental pollution in our country has become increasingly prominent, especially water pollution. Under this background, membrane materials such as polyethylene membrane, polyvinylidene fluoride membrane and polysulfone membrane have been developed rapidly. [0003] Among them, compared with other separation membranes, expanded polytetrafluoroethylene (ePTFE) membrane is famous for its chemical inertness and solvent resistance. Long term, high filtration precision, small filtration resistance, low energy consumption, no medium shedding and other characteristics have laid the foundation for its application in filtration. However, due to the low surface energy and str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00C02F1/44
CPCB01D67/0006B01D71/36B01D2325/36C02F1/44
Inventor 李朝晖
Owner 리자오후이