A kind of preparation method of superhydrophilic PTFE filter membrane and the superhydrophilic PTFE filter membrane that adopts this preparation method to make

A technology of PTFE and filter membrane, which is applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of poor stability of hydrophilic modification, loss of hydrophilic effect, and influence of coating fastness, etc., achieving excellent stability, The effect of improving hydrophilicity and improving firmness

Active Publication Date: 2021-11-30
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, during the self-polymerization process of dopamine, larger particle aggregates are often formed, which not only affects the coating fastness but also blocks the filter membrane. The stability of hydrophilic modification is poor, and it is easy to lose the hydrophilic effect under external physical or chemical effects.

Method used

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  • A kind of preparation method of superhydrophilic PTFE filter membrane and the superhydrophilic PTFE filter membrane that adopts this preparation method to make
  • A kind of preparation method of superhydrophilic PTFE filter membrane and the superhydrophilic PTFE filter membrane that adopts this preparation method to make
  • A kind of preparation method of superhydrophilic PTFE filter membrane and the superhydrophilic PTFE filter membrane that adopts this preparation method to make

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Immerse the PTFE filter membrane (0.22 μm in pore size and 150 μm in thickness) in the ammonia solution containing dopamine and PEI, wherein the concentration of dopamine in the ammonia solution is 2 mg / ml, the concentration of PEI is 1 mg / ml, and the ammonia solution The pH is 8.5;

[0025] (2) G-POSS tetrahydrofuran solution is added in above-mentioned ammonia solution to obtain mixed solution, wherein, the volume ratio of G-POSS tetrahydrofuran solution and ammonia solution is 20:250, and the concentration of G-POSS in mixed solution is 1mg / ml;

[0026] (3) After stirring at room temperature for 24 hours, add copper sulfate to the above mixed solution, and then stir at room temperature for 6 hours, wherein the concentration of copper sulfate in the mixed solution is 40mg / ml;

[0027] (4) Take out the PTFE filter membrane, dry at room temperature after cleaning with deionized water, obtain the required super-hydrophilic PTFE filter membrane.

Embodiment 2

[0029] (1) Immerse the PTFE filter membrane (0.1 μm in pore size and 100 μm in thickness) in an ammonia solution containing dopamine and PEI, wherein the concentration of dopamine in the ammonia solution is 1 mg / ml, the concentration of PEI is 2 mg / ml, and the ammonia solution The pH is 8.5;

[0030] (2) G-POSS tetrahydrofuran solution is added in above-mentioned ammonia solution to obtain mixed solution, wherein, the volume ratio of G-POSS tetrahydrofuran solution and ammonia solution is 20:100, and the concentration of G-POSS in mixed solution is 4mg / ml;

[0031] (3) After stirring at room temperature for 10 hours, add copper sulfate to the above mixed solution, and then stir at room temperature for 1 hour, wherein the concentration of copper sulfate in the mixed solution is 40 mg / ml;

[0032] (4) Take out the PTFE filter membrane, dry at room temperature after cleaning with deionized water, obtain the required super-hydrophilic PTFE filter membrane.

Embodiment 3

[0034] (1) Immerse the PTFE filter membrane (0.22 μm in pore size and 200 μm in thickness) in an ammonia solution containing dopamine and PEI, wherein the concentration of dopamine in the ammonia solution is 4 mg / ml, the concentration of PEI is 2 mg / ml, and the ammonia solution The pH is 8;

[0035] (2) G-POSS tetrahydrofuran solution is added in above-mentioned ammonia solution to obtain mixed solution, wherein, the volume ratio of G-POSS tetrahydrofuran solution and ammonia solution is 20:200, and the concentration of G-POSS in mixed solution is 5mg / ml;

[0036] (3) After stirring at room temperature for 12 hours, add copper sulfate to the above mixed solution, and then stir at room temperature for 6 hours, wherein the concentration of copper sulfate in the mixed solution is 50 mg / ml;

[0037] (4) Take out the PTFE filter membrane, dry at room temperature after cleaning with deionized water, obtain the required super-hydrophilic PTFE filter membrane.

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Abstract

The invention discloses a method for preparing a superhydrophilic PTFE filter membrane, which is characterized in that it comprises the following steps: (1) immersing the PTFE filter membrane in an ammonia solution containing dopamine and PEI; (2) immersing the G-POSS tetrahydrofuran The solution is added to the ammonia solution to obtain a mixed solution; (3) after stirring at room temperature for 10 to 24 hours, copper sulfate is added to the mixed solution, and then stirred at room temperature for 1 to 6 hours; (4) the PTFE filter membrane Take it out, wash it with deionized water and dry it at room temperature to obtain the required super-hydrophilic PTFE filter membrane. The invention also discloses a super-hydrophilic PTFE filter membrane prepared by the above-mentioned preparation method. Compared with the prior art, the super-hydrophilic PTFE filter membrane coating and the interface of the present invention have high firmness, will not block the filter membrane, and have good stability.

Description

technical field [0001] The invention relates to the technical field of filter membrane modification, in particular to a preparation method of a super-hydrophilic PTFE filter membrane and a super-hydrophilic PTFE filter membrane prepared by the preparation method. Background technique [0002] Polytetrafluoroethylene (hereinafter referred to as PTFE) filter membrane has good high and low temperature adaptability, chemical stability, low friction coefficient and electrical insulation properties, making it an ideal material in the field of membrane filtration. However, due to the low surface energy and high hydrophobicity of PTFE filter membranes, the application of PTFE filter membranes in the field of water treatment is greatly restricted. Therefore, the hydrophilic modification of PTFE filter membrane needs to be solved urgently. [0003] Traditionally, the definition of a hydrophilic surface is that when a water droplet is dropped on a solid surface, the contact angle of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/36
CPCB01D61/147B01D67/0002B01D69/02B01D71/36B01D2325/36
Inventor 符思达徐之光
Owner JIAXING UNIV
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