Preparation method of graft modified polytetrafluoroethylene (PTFE) microporous membrane with lasting hydrophilism
A graft-modified, PTFE technology is applied in the field of preparation of a graft-modified PTFE microporous membrane with durable hydrophilicity, and can solve the problems of unstable modification effect, damage to the structure of the membrane body, complicated equipment and the like, To achieve the effect of long-term hydrophilic performance, simple preparation process and easy industrial production
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[0028] Example 1
[0029] A preparation method of graft-modified PTFE microporous membrane with lasting hydrophilicity, the specific steps are as follows:
[0030] 1) Prepare a dopamine aqueous solution with a concentration of 0.1g / L, use Tris-HCl buffer to adjust the pH of the solution to 8.5, immerse the PTFE microporous membrane in ethanol to become transparent, and then immerse it in the dopamine aqueous solution at room temperature for 24 hours;
[0031] 2) Select diethanolamine as the modifier, prepare an aqueous solution of diethanolamine with a concentration of 4g / L, use Tris-HCl buffer to adjust the pH of the solution to 8.5, and immerse the PTFE microporous membrane treated in step 1) in diethanolamine 1h in aqueous solution;
[0032] 3) Take out the PTFE microporous membrane treated in step 2) and dry it to obtain a graft-modified PTFE microporous membrane with permanent hydrophilicity.
Example Embodiment
[0033] Example 2
[0034] 1) Prepare a dopamine aqueous solution with a concentration of 2g / L, use Tris-HCl buffer to adjust the pH of the solution to 8.5, immerse the PTFE microporous membrane in ethanol to become transparent, and then immerse it in the dopamine aqueous solution at room temperature for 24 hours;
[0035] 2) Select diethanolamine as the modifier, prepare a 10g / L diethanolamine aqueous solution, use Tris-HCl buffer to adjust the pH of the solution to 7, and immerse the PTFE microporous membrane treated in step 1) in diethanolamine 0.5h in aqueous solution;
[0036] 3) Take out the PTFE microporous membrane treated in step 2) and dry it to obtain a graft-modified PTFE microporous membrane with permanent hydrophilicity.
Example Embodiment
[0037] Example 3
[0038] 1) Prepare a dopamine aqueous solution with a concentration of 2g / L, use Tris-HCl buffer to adjust the pH of the solution to 8.5, immerse the PTFE microporous membrane in ethanol to become transparent, and then immerse it in the dopamine aqueous solution at room temperature for 24 hours;
[0039] 2) Select aminopolyethylene glycol as the modifier, prepare an aqueous solution of aminopolyethylene glycol with a concentration of 10g / L, use Tris-HCl buffer to adjust the pH of the solution to 10, and remove the PTFE after treatment in step 1). The porous membrane is immersed in an aqueous solution of amino polyethylene glycol for 0.5h;
[0040] 3) Take out the PTFE microporous membrane treated in step 2) and dry it to obtain a graft-modified PTFE microporous membrane with permanent hydrophilicity.
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