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Hydrophilic modification method of polytetrafluoroethylene porous membrane

A polytetrafluoroethylene, hydrophilic modification technology, applied in the field of hydrophilic modification of porous membrane surface, can solve the problem of limited hydrophilic performance, and achieve good hydrophilicity, long-lasting hydrophilicity, and good anti-pollution property. Effect

Active Publication Date: 2018-06-29
中科瑞阳膜技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modification techniques of the above PTFE porous membranes have all improved the hydrophilicity of the membrane to a certain extent, the hydrophilicity is limited, and the minimum contact angle is only about 30°, and the persistence of hydrophilicity is still low. is a challenge

Method used

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  • Hydrophilic modification method of polytetrafluoroethylene porous membrane
  • Hydrophilic modification method of polytetrafluoroethylene porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Firstly, fully wash the flat polytetrafluoroethylene porous membrane with ethanol to remove impurities on the surface of the membrane, and then perform corona treatment after drying. The treatment power is 1000W and the time is 150S;

[0017] 2) Place the PTFE membrane treated in step (1) in polyethyleneimine solution containing N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionic acid disodium amino acid Among them, N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionate disodium amino acid concentration is 0.6wt%, polyethyleneimine concentration is 3wt%, impregnation reaction After 20 minutes, the membrane was taken out, cleaned with a large amount of deionized water, and vacuum-dried to obtain a hydrophilic polytetrafluoroethylene flat porous membrane. After 5 hours, the flux recovery rate was higher than 39.9% after water washing.

Embodiment 2

[0019] 1) First, fully wash the PTFE flat porous membrane with ethanol to remove impurities on the surface of the membrane, and then perform corona treatment after drying, with a treatment power of 2400W and a time of 50S;

[0020] 2) Place the PTFE membrane treated in step (1) in polyethyleneimine solution containing N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionic acid disodium amino acid Among them, N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionate disodium amino acid concentration is 1.2wt%, polyethyleneimine concentration is 0.5wt%, impregnation After reacting for 180 minutes, the membrane was taken out, cleaned with a large amount of deionized water, and vacuum-dried to obtain a hydrophilic polytetrafluoroethylene flat porous membrane. , after 5 hours, the flux recovery rate was higher than 46.8% after washing with water.

Embodiment 3

[0022] 1) First, fully wash the PTFE flat porous membrane with ethanol to remove impurities on the surface of the membrane, and then perform corona treatment after drying, with a treatment power of 2000W and a time of 80S;

[0023] 2) Place the PTFE membrane treated in step (1) in polyethyleneimine solution containing N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionic acid disodium amino acid Among them, N-(2-perfluorooctylsulfonamidoethyl)-β,β'-iminodipropionate disodium amino acid concentration is 0.9wt%, polyethyleneimine concentration is 2.0wt%, impregnation After reacting for 120 minutes, the membrane was taken out, cleaned with a large amount of deionized water, and vacuum-dried to obtain a hydrophilic polytetrafluoroethylene porous membrane. After 5 hours, the flux recovery rate was higher than 73.6% after water washing.

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Abstract

The invention provides a hydrophilic modification method of a polytetrafluoroethylene porous membrane and belongs to the technical field of membranes. The hydrophilic modification method comprises thefollowing steps: washing the polytetrafluoroethylene porous membrane with alcohol to remove the impurities on the surface of the membrane, drying and then carrying out corona treatment to generate active groups on the surface of the membrane; putting the treated PTFE membrane in a polyelectrolyte solution containing a fluorocarbon surfactant, wherein the concentration of the fluorocarbon surfactant is 0.6-1.2wt%, and the concentration of polyelectrolyte is 0.5-3wt%; impregnating and reacting for 20-180 minutes, then taking the membrane out of the polyelectrolyte solution, washing the membranewith deionized water, and drying the membrane in vacuum to obtain a hydrophilic polytetrafluoroethylene porous membrane. The polytetrafluoroethylene porous membrane prepared by the method has excellent and lasting hydrophilcity and also has excellent anti-fouling performance; the contact angle between the polytetrafluoroethylene porous membrane and the water is less than 10 degrees.

Description

technical field [0001] The invention relates to a hydrophilic modification of the surface of a porous membrane, in particular to a method for the hydrophilic modification of a polytetrafluoroethylene porous membrane, and belongs to the technical field of membranes. Background technique [0002] Polytetrafluoroethylene (PTFE) membrane has excellent physical and chemical properties, acid and alkali resistance, chemical corrosion resistance, high porosity, large flux, can adapt to membrane separation in harsh environments, and has a wide range of application prospects. However, due to the low surface energy of PTFE membrane, strong hydrophobicity and poor surface wettability, its application in the field of liquid filtration is greatly limited, and the membrane surface is easily polluted during the separation process, resulting in flux and membrane separation. Performance drops. [0003] The researchers improved the wettability and anti-fouling properties of the membrane surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/36B01D69/02
CPCB01D67/0093B01D69/02B01D71/36B01D2325/36
Inventor 郭红霞赵营营秦振平赵耀刘世杰崔素萍
Owner 中科瑞阳膜技术(北京)有限公司
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