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A device for electrochemically modifying polyvinylidene fluoride membrane and its modification method

A polyvinylidene fluoride film and electrochemical technology, applied in the field of material processing, can solve problems such as high cost and environmental pollution, and achieve the effects of preventing losses, avoiding secondary pollution, and avoiding excessive costs

Active Publication Date: 2021-12-17
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the present invention, sodium chloride is used as electrolyte to obtain oxidizing substances with oxidation function, and the oxidizing substances are used to oxidize the pretreated polyvinylidene fluoride membrane filaments, and the pretreated polyvinylidene fluoride membrane filaments are present on the surface Oxidation of the unsaturated double bond of the polyvinylidene fluoride to form a hydrophilic group, thereby improving the hydrophilic performance of the surface of the polyvinylidene fluoride membrane filament, and solving the problems of environmental pollution and high cost during the modification process of the polyvinylidene fluoride membrane

Method used

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  • A device for electrochemically modifying polyvinylidene fluoride membrane and its modification method
  • A device for electrochemically modifying polyvinylidene fluoride membrane and its modification method
  • A device for electrochemically modifying polyvinylidene fluoride membrane and its modification method

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Embodiment 1

[0027] A device for electrochemically modifying a polyvinylidene fluoride membrane, said device comprising an electrolytic cell;

[0028] The electrolytic cell comprises a titanium microporous anode and a stainless steel cathode tube;

[0029] The titanium microporous anode is placed in a stainless steel cathode tube, the titanium microporous anode is connected to the positive pole of the DC regulated power supply 1, the cathode tube is connected to the negative pole of the DC regulated power supply 1, and the bottom of the stainless steel cathode tube is arranged There is a water inlet, the top of the stainless steel cathode tube is provided with a cathode water outlet 3, and the top of the titanium microporous anode is provided with an anode water outlet 2;

[0030] The liquid tank 8 is connected to the water inlet of the electrolytic cell through the diaphragm pump 4, and the pipeline connecting the diaphragm pump 4 and the liquid tank 8 is provided with a drain valve 5, an...

Embodiment 2

[0032] Utilize the electrochemical modification polyvinylidene fluoride film method of device described in embodiment 1, described method comprises the steps:

[0033] First soak the polyvinylidene fluoride membrane silk in 50% ethanol for 1d to activate, then soak the activated polyvinylidene fluoride membrane silk in 0.5% NaOH solution for 5min to carry out alkali treatment, and then the polyvinylidene fluoride after alkali treatment Vinylidene fluoride membrane filaments are cleaned with deionized water;

[0034] Close the exhaust valve 6 and the liquid discharge valve 5, add the electrolyte sodium chloride to the liquid tank 8, open the diaphragm pump 4 and run for 5 minutes until the concentration of the liquid material is uniform;

[0035] Turn on the DC stabilized power supply 1, adjust the voltage of the DC stabilized power supply 1 to 10V, and run for 10 minutes. After the water production is stable, put the treated polyvinylidene fluoride membrane wire into the oxida...

Embodiment 3

[0038] Utilize the electrochemical modification polyvinylidene fluoride film method of device described in embodiment 1, described method comprises the steps:

[0039] First soak the polyvinylidene fluoride membrane silk in 50% ethanol for 1d to activate, then soak the activated polyvinylidene fluoride membrane silk in 0.5% NaOH solution for 5min to carry out alkali treatment, and then the polyvinylidene fluoride after alkali treatment Vinylidene fluoride membrane filaments are cleaned with deionized water;

[0040] Close the exhaust valve 6 and the liquid discharge valve 5, add the electrolyte sodium chloride to the liquid tank 8, open the diaphragm pump 4 and run for 5 minutes until the concentration of the liquid material is uniform;

[0041] Turn on the DC stabilized power supply 1, adjust the voltage of the DC stabilized power supply 1 to 10V, and run for 10 minutes. After the water production is stable, put the treated polyvinylidene fluoride membrane wire into the oxida...

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Abstract

The invention relates to a device for electrochemically modifying a polyvinylidene fluoride film and a modification method thereof, belonging to the technical field of material processing. The device of the present invention includes an electrolytic cell; the electrolytic cell includes a microporous anode and a cathode tube; the microporous anode is placed in the cathode tube, the bottom of the cathode tube is provided with a water inlet, and the top of the cathode tube is provided with Cathode water outlet, the top of the microporous anode is provided with an anode water outlet; the liquid tank is connected with the water inlet of the electrolytic cell through a diaphragm pump, the anode water outlet of the electrolytic cell is connected with the oxidation overflow tank, and the electrolytic cell The cathode water outlet returns to the liquid tank.

Description

technical field [0001] The invention relates to a device for electrochemically modifying a polyvinylidene fluoride film and a modification method thereof, belonging to the technical field of material processing. Background technique [0002] Polyvinylidene fluoride is a semi-crystalline polymer, which has been widely used in the preparation of ultrafiltration membranes due to its strong stability, oxidation resistance, acid and alkali corrosion resistance, and low price. However, due to some defects of the polyvinylidene fluoride material itself, the ultrafiltration membrane prepared by it has poor hydrophilicity, anti-pollution or permeability, and has a large membrane resistance, which is vulnerable to protein or other impurities in the water during operation. Pollution, the cleaning process is easy to cause damage to the ultrafiltration membrane, reduce its service life, increase production costs, and then affect its further development and application in certain fields. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34
CPCB01D67/0093B01D69/02B01D71/34B01D2325/36
Inventor 李刚杨硕李彦生杨从
Owner DALIAN JIAOTONG UNIVERSITY