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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

Active Publication Date: 2013-07-24
中材科技膜材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods more or less have the disadvantages of destroying the structure of the membrane body, the modification effect is not durable and stable, the operation steps are cumbersome, and the equipment is complicated.

Method used

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  • Preparation method of graft modified polytetrafluoroethylene (PTFE) microporous membrane with lasting hydrophilism
  • Preparation method of graft modified polytetrafluoroethylene (PTFE) microporous membrane with lasting hydrophilism
  • Preparation method of graft modified polytetrafluoroethylene (PTFE) microporous membrane with lasting hydrophilism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method with persistent hydrophilic graft modified PTFE microporous membrane, concrete 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 value of the solution to 8.5, soak the PTFE microporous membrane in ethanol until it is 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 value of the solution to 8.5, and immerse the PTFE microporous membrane treated in step 1) in diethanolamine 1h in aqueous solution;

[0032] 3) The PTFE microporous membrane treated in step 2) is taken out and dried to obtain a graft-modified PTFE microporous membrane with persistent hydrophilicity.

Embodiment 2

[0034] 1) Prepare a dopamine aqueous solution with a concentration of 2g / L, adjust the pH value of the solution to 8.5 with Tris-HCl buffer, soak the PTFE microporous membrane in ethanol until it is transparent, and then immerse it in the dopamine aqueous solution at room temperature for 24 hours;

[0035] 2) Select diethanolamine as the modifier, prepare an aqueous solution of diethanolamine with a concentration of 10g / L, use Tris-HCl buffer to adjust the pH value of the solution to 7, and immerse the PTFE microporous membrane treated in step 1) in diethanolamine 0.5h in aqueous solution;

[0036] 3) The PTFE microporous membrane treated in step 2) is taken out and dried to obtain a graft-modified PTFE microporous membrane with persistent hydrophilicity.

Embodiment 3

[0038] 1) Prepare a dopamine aqueous solution with a concentration of 2g / L, adjust the pH value of the solution to 8.5 with Tris-HCl buffer, soak the PTFE microporous membrane in ethanol until it is transparent, and then immerse it in the dopamine aqueous solution at room temperature for 24 hours;

[0039] 2) Select aminopolyethylene glycol as a modifier, prepare an aqueous solution of aminopolyethylene glycol with a concentration of 10g / L, use Tris-HCl buffer to adjust the pH value of the solution to 10, and micronize the PTFE treated in step 1). The porous membrane is immersed in an aqueous solution of aminopolyethylene glycol for 0.5h;

[0040] 3) The PTFE microporous membrane treated in step 2) is taken out and dried to obtain a graft-modified PTFE microporous membrane with persistent hydrophilicity.

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Abstract

The invention relates to a preparation method of a graft modified polytetrafluoroethylene (PTFE) microporous membrane with lasting hydrophilism. The method comprises the following steps of: firstly, preparing a dopamine water solution; regulating a pH value to be 7-10; putting the PTFE microporous membrane into ethanol and wetting to be transparent; soaking into the dopamine water solution at room temperature; preparing a modifying agent water solution by using a hydrophilic reagent as a modifying agent; regulating a pH value to be 7-10; soaking the PTFE microporous membrane subjected to treatment of the dopamine water solution into the modifying agent water solution; and taking out and drying to obtain the gas modified PTFE microporous membrane. By using the method, the hydrophilic performance of the modified PTFE microporous membrane is obviously improved, the process is simple, and the modification effect keeps lasting and stable.

Description

technical field [0001] The invention relates to a preparation method of a graft-modified PTFE microporous membrane with persistent hydrophilicity, and more specifically relates to a method for modifying the surface of the PTFE microporous membrane by grafting hydrophilic molecules. It belongs to the application field of PTFE water treatment membrane. Background technique [0002] PTFE is a very important engineering plastic due to its excellent chemical and physical properties. It is used in many fields and is also an important membrane material. PTFE microporous membrane not only has excellent chemical and physical properties, but also has the advantages of waterproof, breathable, windproof and warm due to its small pore size and high porosity. It has important application prospects in chemical, medical, clothing, electronics and other fields. However, the low surface energy and poor surface wettability of PTFE affect its wider application. At the same time, due to the lo...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00
Inventor 黎鹏范凌云杨振东黄箭玲赵东波费传军董浩宇郭晓蓓周群宋尚军白耀宗
Owner 中材科技膜材料(山东)有限公司
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