Hydrophilic modification method of polytetrafluorethylene separation membrane surface

A polytetrafluoroethylene membrane and polytetrafluoroethylene technology are applied in the field of hydrophilic modification on the surface of membrane separation materials, and can solve the problems of inability to obtain hydrophilic modification effect, damage to membrane surface structure, complicated modification process, etc. To achieve the effect of simplifying the hydrophilization modification process, improving the hydrophilicity and improving the hydrophilicity

Inactive Publication Date: 2008-11-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods have their own characteristics. In comparison, surface modification often damages the structure of the film surface to a certain extent, especially surface plasma treatment and surface chemical etching, and there are certain uncertainties in the modification process. factors; simple physical coating on the surface cannot obtain a lasting hydrophilic modification effect; in addition, due to the chemical inertness of PTFE materials, the modification process is more complicated and the effect is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Soak a polytetrafluoroethylene flat ultrafiltration membrane (with a membrane pore size of 0.01 to 0.1 μm and a membrane surface contact angle of 132°) in 0.5% aqueous solution of dodecyl dimethyl betaine for 0.5 hours, take it out and dry it naturally; Evenly coat a 1% methanol solution of polyethyleneimine with a molecular weight of 500,000 on the surface of the film and dry it; place the coated polytetrafluoroethylene flat film in 0.5% methanol solution of p-dibromobenzyl , carry out in-situ quaternization cross-linking reaction at 25°C; after reacting for 6 hours, place the cross-linked film in 0.5% methyl iodide solution to fully quaternize the unreacted tertiary amino groups, and the reaction temperature is 20°C, the reaction time is 2 hours; after the reaction, wash with ethanol and deionized water in sequence, and dry to obtain a hydrophilic modified polytetrafluoroethylene flat film, and its hydrophilic properties are shown in Table 1.

Embodiment 2

[0024] Soak a polytetrafluoroethylene flat ultrafiltration membrane (with a membrane pore size of 0.01-0.1 μm and a membrane surface contact angle of 132°) in 1% aqueous solution of sulfobetaine for 1 hour, take it out and dry it naturally; Uniformly coat a 4% methanol solution of polyethyleneimine with a molecular weight of 300,000, and dry it in the air; place the coated polytetrafluoroethylene flat film in a 1% methanol solution of p-dibromobenzyl, at 40°C The in-situ quaternization cross-linking reaction was carried out under the following conditions; after 12 hours of reaction, the cross-linked membrane was placed in 1% iodomethane solution to fully quaternize the unreacted tertiary amino groups, the reaction temperature was 25°C, and the reaction The time is 2 hours; after the reaction, wash with ethanol and deionized water in sequence, and dry to obtain a hydrophilic modified polytetrafluoroethylene flat membrane, and its hydrophilic properties are shown in Table 1.

Embodiment 3

[0026] Soak a polytetrafluoroethylene hollow fiber ultrafiltration membrane (with a membrane pore size of 0.01-0.1 μm and a membrane surface contact angle of 138°) in 2% aqueous solution of betaine dodecylsulfonate for 2 hours, take it out and dry it naturally ; On the surface of the film, evenly coat a molecular weight of 100,000 polyethylenimine 8% acetone solution, dry; the coated polytetrafluoroethylene flat film is placed in 2% acetone solution to dibromobenzyl In situ quaternization cross-linking reaction at 50°C; after 16 hours of reaction, the cross-linked film was placed in 2% methyl iodide solution to fully quaternize the unreacted tertiary amino groups, and the reaction temperature The temperature was 30°C, and the reaction time was 1 hour; after the reaction, it was washed with ethanol and deionized water in sequence, and after drying, a hydrophilic modified polytetrafluoroethylene flat membrane was obtained, and its hydrophilic properties are shown in Table 1.

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Abstract

The present invention discloses a hydrophilization modification method of polytetrafluoroethylene membrane surface, comprising the following course: pretreating the polytetrafluoroethylene membrane by lycine surfactant, evenly coating a layer of hydrophilic polymer on the surface, placing the membrane material coated with hydrophilic polymer into the quaternized cross linker solution for in-situ quaternized cross linking reaction, finally getting the lasting hydrophilic modified polytetrafluoroethylene separation membrane. The present invention has abundant modifier source, simple method and low cost, and is suitable for industrial production; the cross-linked hydrophilic layer on the membrane surface is not liable to drain away; the modified polytetrafluoroethylene membrane has good hydrophilicity and persistence.

Description

technical field [0001] The invention relates to a surface hydrophilization modification technology of a membrane separation material. It specifically relates to a method for coating and cross-linking a hydrophilic polymer on the surface of a polytetrafluoroethylene separation membrane. Background technique [0002] PTFE is a membrane separation material with excellent comprehensive properties. It has excellent chemical stability, heat resistance, cold resistance and chemical corrosion resistance. At the same time, it also has good electrical insulation, low surface tension and friction coefficient, Incombustibility, atmospheric aging resistance, high and low temperature adaptability and high mechanical properties have broad application prospects in the field of membrane separation. However, due to the low surface energy and strong hydrophobicity of such membrane materials, when dealing with aqueous phase separation systems, the mass transfer driving force of the fluid passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D71/82B01D67/00
Inventor 黄小军徐志康
Owner ZHEJIANG UNIV
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