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Method for modifying polymer porous membrane by diffusion reaction

A diffusion reaction and polymer technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as easy loss of surfactants, hydrophilicity cannot be kept stable for a long time, and membrane adsorption pollution increases

Active Publication Date: 2021-04-02
杭州高通膜技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing methods, the surface coating method is mainly used for modification treatment. The surface coating method is to make the surface active agent adsorb on the surface of the membrane through physical adsorption. The surfactant is easily lost during use, resulting in long-term hydrophilicity. Remain stable, membrane adsorption fouling increased, water flux decreased

Method used

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  • Method for modifying polymer porous membrane by diffusion reaction
  • Method for modifying polymer porous membrane by diffusion reaction
  • Method for modifying polymer porous membrane by diffusion reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Prepare an aqueous solution of sodium dodecylsulfonate with a mass percentage concentration of 0.05%, soak a clean polypropylene flat film in it, soak at a temperature of 50°C, and soak for 10 hours. The aqueous solution of sodium sulfonate is evenly distributed on the surface of the polypropylene flat membrane and its pores;

[0023] 2) Take out the coated polypropylene membrane, fix it in the diffusion cell, and add the aqueous solutions of aluminum nitrate and sodium carbonate on both sides of the membrane respectively, the concentration is 0.6 mol / liter, and the two reaction solutions diffuse through the membrane pores, The diffusion reaction was carried out at 30°C for 5 hours.

[0024] 3) After the diffusion reaction is completed, the polypropylene membrane is taken out from the diffusion cell, and washed repeatedly in ethanol and pure water to obtain a modified polypropylene membrane.

Embodiment 2

[0026] 1) Prepare an ethanol solution of tannic acid with a mass percentage concentration of 5%, soak the clean polyvinylidene fluoride hollow fiber in it, the soaking temperature is 10°C, and the soaking time is 40 hours. The ethanol solution is evenly distributed on the surface of the polyvinylidene fluoride hollow fiber membrane and its pores;

[0027] 2) Take out the coated polyvinylidene fluoride membrane, fix it in the diffusion cell, and add the aqueous solution of magnesium chloride and sodium bicarbonate on both sides of the membrane respectively, the concentration is 0.3 mol / liter, and the two reaction solutions pass through the pores of the membrane to interact with each other. Diffusion, the diffusion reaction was carried out at 10°C for 40 hours.

[0028] 3) After the diffusion reaction is completed, the polyvinylidene fluoride membrane is taken out from the diffusion cell, and washed repeatedly in ethanol and pure water to obtain a modified polyvinylidene fluorid...

Embodiment 3

[0030] 1) Prepare an ethanol solution of silanol with a mass percentage concentration of 0.1%, soak the clean polytetrafluoroethylene flat film in it, the soaking temperature is 20°C, and the soaking time is 24 hours, and the ethanol solution of silanol is made by ultrasonic Evenly distributed on the surface of PTFE flat membrane and its pores;

[0031] 2) Take out the coated polytetrafluoroethylene flat film, fix it in the diffusion cell, and add the aqueous solution of silicon tetrachloride and sodium hydroxide on both sides of the film, the concentration is 0.01 mol / L, and the two reaction solutions Interdiffusion through the membrane pores was carried out at 80°C for 10 hours.

[0032] 3) After the diffusion reaction is completed, the polytetrafluoroethylene membrane is taken out from the diffusion cell, and washed repeatedly in ethanol and pure water to obtain a modified polytetrafluoroethylene membrane.

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Abstract

The invention discloses a method for modifying a polymer porous membrane by diffusion reaction and belongs to the technical field of separation membrane material surface modification. The method comprises the following steps: 1) preparing an organic intermediate layer coating solution, soaking a clean polymer porous membrane in the coating solution, and uniformly distributing the coating solutionon the surface of the polymer porous membrane and in pore channels of the polymer porous membrane; 2) taking out the coated polymer porous membrane, fixing the polymer porous membrane in a diffusion cell, respectively adding different reaction solutions A and B at two sides of the membrane, and mutually diffusing the two reaction solutions through membrane holes; and 3) after the diffusion reaction is finished, taking the polymer porous membrane out of the diffusion cell, and repeatedly cleaning in ethanol and pure water to obtain the surface mineralized modified polymer porous membrane. The method for modifying the polymer porous membrane through the diffusion reaction is suitable for surface hydrophilization modification of the polymer porous membrane, the obtained modified polymer porous membrane has excellent hydrophilicity, and the water permeation flux can be increased by 3-10 times. The method has the advantages of simple and easily-controlled reaction conditions, easiness in amplification and great popularization value.

Description

technical field [0001] The invention belongs to the technical field of surface modification of separation membrane materials, in particular to a method for modifying polymer porous membranes by diffusion reaction. Background technique [0002] Membrane separation technology has the advantages of convenient continuous operation, easy scale-up, low energy consumption, and high energy utilization rate, and is widely used in chemical, food, pharmaceutical, biochemical and other fields. Polymers have become the materials for preparing porous membranes because of their excellent performance, low cost, and easy processability. However, during the membrane treatment process, the membrane surface is easily polluted by organic substances such as oil and protein in the feed liquid, resulting in attenuation of the membrane flux and a decrease in separation efficiency, which requires regular cleaning. Commonly used physical cleaning methods can remove loosely adsorbed pollutants on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/06B01D69/08B01D71/26B01D71/30B01D71/34B01D71/36B01D71/42B01D71/68
CPCB01D67/0093B01D67/0088B01D69/06B01D69/08B01D71/26B01D71/30B01D71/34B01D71/36B01D71/42B01D71/68B01D2325/36
Inventor 朱利平张梦晓王霄鹤方传杰周哲松周联友周志勤
Owner 杭州高通膜技术有限公司
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