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Polytetrafluoroethylene electrocatalytic porous membrane and preparation method thereof

A technology of polytetrafluoroethylene film and polytetrafluoroethylene, which is applied in the field of polytetrafluoroethylene electrocatalytic porous film and its preparation, can solve the problems of limited application, high cost, and poor flexibility, and achieve good flexibility, low price, The effect of the simple and easy preparation method

Active Publication Date: 2018-02-27
士芯传感科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the conductive base films currently used are carbon films. Although they have good conductivity and stability, their cost is high and their flexibility is poor, so their application is limited.

Method used

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  • Polytetrafluoroethylene electrocatalytic porous membrane and preparation method thereof
  • Polytetrafluoroethylene electrocatalytic porous membrane and preparation method thereof
  • Polytetrafluoroethylene electrocatalytic porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a polytetrafluoroethylene electrocatalytic porous membrane, comprising the steps of:

[0042] 1) Prepare a conductive dispersion; weigh 0.01g MWCNTs and 99.99g DMAc, mix them, and ultrasonically disperse them for 4 hours at a frequency of 40KHz to obtain a uniformly dispersed dispersion A;

[0043] 2) Pretreatment of the base film: Soak the biaxially stretched polytetrafluoroethylene film in absolute ethanol, and ultrasonicate for 30 minutes at a frequency of 40KHz to keep the film surface clean and make the polytetrafluoroethylene film porous Fully infiltrated to obtain the pretreated polytetrafluoroethylene membrane;

[0044] 3) Fix the pretreated polytetrafluoroethylene membrane in a sand core filter device, inject 80g of dispersion A into the sand core filter device, and under the condition of a pressure of -15KPa, vacuum filter the described The multi-walled carbon nanotubes in the dispersion A are supported on the surface of the polytetraf...

Embodiment 2

[0048] A preparation method of a polytetrafluoroethylene electrocatalytic porous membrane, comprising the steps of:

[0049] 1) Prepare a conductive dispersion; weigh 0.01g MWCNTs, 0.01g graphene and 99.98g DMAc, mix, and ultrasonically disperse for 4 hours at a frequency of 40KHz to obtain a uniformly dispersed dispersion A;

[0050] 2) Pretreatment of the base film: Soak the biaxially stretched polytetrafluoroethylene film in absolute ethanol, and ultrasonicate for 30 minutes at a frequency of 40KHz to keep the film surface clean and make the polytetrafluoroethylene film porous Fully infiltrated to obtain the pretreated polytetrafluoroethylene membrane;

[0051] 3) Fix the pretreated polytetrafluoroethylene membrane in a sand core filter device, inject 80g of dispersion A into the sand core filter device, and under the condition of a pressure of -15KPa, vacuum filter the described The mixture of multi-walled carbon nanotubes and graphene in the dispersion liquid A is suppor...

Embodiment 3

[0055] A preparation method of a polytetrafluoroethylene electrocatalytic porous membrane, comprising the steps of:

[0056] 1) Prepare a conductive dispersion; weigh 0.01g MWCNTs, 0.01g graphene and 99.98g DMAc, mix, and ultrasonically disperse for 4 hours at a frequency of 40KHz to obtain a uniformly dispersed dispersion A;

[0057] Disperse 0.01g of nano-titanium dioxide in 99.99g of absolute ethanol, and disperse it ultrasonically for 4 hours at a frequency of 40KHz to obtain dispersion B;

[0058] 2) Pretreatment of the base film: Soak the biaxially stretched polytetrafluoroethylene film in absolute ethanol, and ultrasonicate for 30 minutes at a frequency of 40KHz to keep the film surface clean and make the polytetrafluoroethylene film porous Fully infiltrated to obtain the pretreated polytetrafluoroethylene membrane;

[0059] 3) Fix the pretreated polytetrafluoroethylene membrane in a sand core filter device, inject 80g of dispersion A into the sand core filter device, ...

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Abstract

The invention discloses a polytetrafluoroethylene electro-catalysis porous membrane and a preparing method thereof. The membrane is composed of a basement membrane and a conducting layer loaded on the surface of the basement membrane, or an electro-catalysis layer is loaded on the surface of the conducting layer. The basement membrane is a polytetrafluoroethylene formed by two-way stretching, and the conducting layer is made of multiwalled carbon nanotubes or a mixture of the multiwalled carbon nanotubes and graphene. The preparing method includes the steps that conducting layer substances are evenly dispersed in solvent to obtain dispersion liquid A; ethyl alcohol is used for conducting pretreatment on the basement membrane; the basement membrane is fixed into a sand core filtering device, and the conducting substances in the dispersion liquid A are deposited on the surface of the membrane and dried to obtain a polytetrafluoroethylene electro-catalysis membrane; before drying, dispersion liquid of electro-catalysis substances is deposited on the surface of the conducting layer with the sand core filtering device and dried to obtain the polytetrafluoroethylene electro-catalysis porous membrane. Compared with a membrane using a carbon membrane as a basement membrane, the polytetrafluoroethylene electro-catalysis porous membrane is good in flexibility and low in cost; the preparing method is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a polytetrafluoroethylene electrocatalytic porous membrane and a preparation method thereof. Background technique [0002] Water is the source of life, and the shortage of water resources is becoming more and more serious, making wastewater treatment a global topic. Membrane technology has the advantages of low input cost and high efficiency, such as membrane bioreactor (MBR), reverse osmosis (RO) and membrane distillation (MD), etc., which have attracted more and more attention in water treatment. However, membrane fouling is an unavoidable phenomenon in the membrane process, which seriously hinders the efficiency of the membrane process and the service life of membrane materials. Therefore, controlling and alleviating membrane fouling has become the most critical issue in the field of membrane technology. At present, in order to solve the problem of membrane fouling, a serie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00B01J31/38B01J31/32
CPCB01D67/0002B01D71/36B01D2325/26B01J31/32B01J31/38
Inventor 黄庆林刘欢肖长发黄岩
Owner 士芯传感科技(苏州)有限公司