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A kind of preparation method of porous film

A technology of porous membrane and perfluorocarbon, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of increasing surface tension and ensuring safety

Active Publication Date: 2020-12-29
HANGZHOU COBETTER FILTRATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies of the prior art, the present invention provides a method for preparing a porous membrane that is not prone to dehumidification after being wetted by water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 70g of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether and 30g of perfluoro(4-methyl-3,6-dioxa-7-octene)sulfonyl Fluorine was mixed to prepare a solution of perfluorocarbon monomer compound A with a mass fraction of 30%, and 0.2 g of photoinitiator Irgacure2959 was added to the solution A. Thoroughly stir the solution to completely mix the monomer and initiator.

[0030] Stir and soak a PTFE porous membrane with an average pore size of 0.1um and a diameter of 47mm in the above solution A for 2 minutes, so that the solution fully wets the surface of the membrane. After taking it out, sandwich the membrane between two transparent PE membranes in a wet state , after expelling the air by extrusion, put it under ultraviolet light and irradiate it at a speed of 2m / min for 0.5s, then immerse the porous membrane in solution A again, take it out and then irradiate it with ultraviolet light for 0.5s, and so on. , so that the ultraviolet light irradiation time reaches 5s...

Embodiment 2

[0034] 60g of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether and 40g of perfluoro(4-methyl-3,6-dioxa-7-octene)sulfonyl Fluorine was mixed to form a solution of perfluorocarbon monomer compound A with a mass fraction of 40%, and 0.2 g of photoinitiator Irgacure2959 was added to solution A. Thoroughly stir the solution to completely mix the monomer and initiator.

[0035] Stir and soak a PTFE porous membrane with an average pore size of 0.1um and a diameter of 47mm in the above solution A for 2 minutes, so that the solution fully wets the surface of the membrane, and sandwiches it between two transparent PE membranes in a wet state. After exhausting the air, put it under ultraviolet light and irradiate it at a speed of 4m / min for 1s, then immerse the porous membrane in solution A again, take it out and then irradiate it with ultraviolet light for 1s, and cycle like this to make the ultraviolet light irradiate After the time reaches 6s, the porous membrane is then imme...

Embodiment 3

[0039] 75g of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether and 25g of perfluoro(4-methyl-3,6-dioxa-7-octene)sulfonyl Fluorine was mixed to form a solution of perfluorocarbon monomer compound A with a mass fraction of 25%, and 0.2 g of photoinitiator Irgacure2959 was added to solution A. Thoroughly stir the solution to completely mix the monomer and initiator.

[0040] Stir and soak a PTFE porous membrane with an average pore size of 0.05um and a diameter of 47mm in the above solution A for 2 minutes, so that the solution fully wets the surface of the membrane, and sandwiches it between two transparent PE membranes in a wet state. After exhausting the air, put it under ultraviolet light and irradiate it at a speed of 2m / min for 1s, then immerse the porous membrane in solution A again, take it out and then irradiate it with ultraviolet light for 1s, and cycle like this to make the ultraviolet light irradiate After the time reaches 6s, the porous membrane is then imm...

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PUM

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Abstract

The invention discloses a preparation method for a porous membrane. The method comprises the following steps: dissolving perfluorocarbon monomeric compound; placing the porous membrane into the solution for soaking; irradiating with ultraviolet rays; and soaking in clean water and drying. The fluoropolymer porous membrane subjected to the graft polymerization treatment with perfluorocarbon monomeric compound according to the invention is capable of promoting the surface tension of the porous membrane under the condition of keeping the chemical stability thereof, so that the membrane is difficult to dehumidify in the filtering use process, the filtering safety is high and the graft polymerization has ultralow influence on the pore of the porous membrane and is free from influence on the flux of the membrane filter.

Description

technical field [0001] The invention belongs to the field of preparation of filter membranes, in particular to a preparation method of porous membranes. Background technique [0002] Porous membrane filters have highly controlled porosity and thickness and are commonly used to separate particulate impurities from gases or liquids. [0003] Fluoropolymer materials such as polytetrafluoroethylene have excellent chemical stability, and can maintain the integrity of the membrane under conditions such as strong acid and strong alkali, and will not be corroded, degraded, or release extractables, thus ensuring Purity and cleanliness of filtration. Therefore, fluoropolymer materials are often used to make porous membrane filters. [0004] However, one disadvantage of fluoropolymer materials is that they naturally have very low surface tension and are hydrophobic. Therefore, porous membranes made of such polymers cannot be wetted by liquids with high surface tension such as water,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D67/00
CPCB01D67/0006B01D71/78
Inventor 朱赞青
Owner HANGZHOU COBETTER FILTRATION EQUIP