A kind of polytetrafluoroethylene membrane and its hydrophilic treatment method and application

A technology of polytetrafluoroethylene membrane and hydrophilic treatment, which is applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc. Problems with water stability, disappearance, etc.

Active Publication Date: 2022-04-22
SHANGHAI SEVOO ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional polytetrafluoroethylene biaxially stretched membrane (ePTFE) is used in the field of water filtration, and it needs to be treated with hydrophilicity. There are many ways of hydrophilic treatment, but after a period of filtering and permeating water, the hydrophilicity will be more or less attenuated. even disappear
For example, in the prior art, there is direct dip-coating of the hydrophilic fluoropolymer resin VOH on the polytetrafluoroethylene biaxially stretched film to improve the hydrophilic performance of the polytetrafluoroethylene biaxially stretched film, but the polymer Hydroxyl groups are easily lost under the influence of filtered water flow, temperature, acid-base, and oxidants, which in turn will affect the hydrophilic stability of PTFE biaxially stretched membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a kind of hydrophilic treatment method of polytetrafluoroethylene film, it comprises the following steps:

[0022] S1, the hydrophilic fluorine-containing polymer resin and the epoxy polymer are placed in the solvent according to the molar ratio of 5.5:1 to carry out the crosslinking reaction, and the polymer solution having a mass concentration of 3% is obtained; wherein, the ring of the epoxy polymer Oxygen equivalent is 384, specifically can adopt the commercially available DOW620 of Dow Chemical; Hydrophilic fluoropolymer resin is the VOH polymkeric substance in the prior art, and its preparation method can refer to existing published U.S. Patent 5,130,024; Solvent is methyl alcohol and Ethanol was mixed in a volume ratio of 4:1.

[0023] S2. Dip coating the polytetrafluoroethylene film with the above polymer solution and dry it to obtain a hydrophilic treated polytetrafluoroethylene film. Wherein, the polytetrafluoroethylene film can adopt...

Embodiment 2

[0025] This embodiment provides a kind of hydrophilic treatment method of polytetrafluoroethylene film, it comprises the following steps:

[0026] S1, the hydrophilic fluorine-containing polymer resin and the epoxy polymer are placed in the solvent according to the molar ratio of 5.5:1 to carry out the crosslinking reaction to obtain a polymer solution with a mass concentration of 2%; wherein, the ring of the epoxy polymer Oxygen equivalent is 576, specifically can adopt the commercially available DOW661 of Dow Chemical; Hydrophilic fluoropolymer resin is the VOH polymkeric substance in the prior art, and its preparation method can refer to existing published U.S. Patent 5,130,024; Solvent is methyl alcohol and Ethanol was mixed in a volume ratio of 4:1.

[0027] S2. Dip coating the polytetrafluoroethylene film with the above polymer solution and dry it to obtain a hydrophilic treated polytetrafluoroethylene film. Wherein, the polytetrafluoroethylene film can adopt commercial...

Embodiment 3

[0029] This embodiment provides a kind of hydrophilic treatment method of polytetrafluoroethylene film, it comprises the following steps:

[0030] S1, the hydrophilic fluorine-containing polymer resin and the epoxy polymer are placed in the solvent according to the molar ratio of 4:1 for cross-linking reaction, and the polymer solution with a mass concentration of 1% is obtained; wherein, the ring of the epoxy polymer The oxygen equivalent is 300; the hydrophilic fluoropolymer resin is a VOH polymer in the prior art, and its preparation method can refer to the existing published U.S. Patent 5,130,024; the solvent is methanol and ethanol mixed according to a volume ratio of 3:1 mixture.

[0031] S2. Dip coating the polytetrafluoroethylene film with the above polymer solution and dry it to obtain a hydrophilic treated polytetrafluoroethylene film. Wherein, the polytetrafluoroethylene film can adopt commercially available common biaxially stretched polytetrafluoroethylene film. ...

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PUM

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Abstract

The present invention is applicable to the technical field of filter materials, and provides a polytetrafluoroethylene membrane and its hydrophilic treatment method and application. The hydrophilic treatment method of the polytetrafluoroethylene membrane comprises the following steps: combining a hydrophilic epoxy polymer with An epoxy polymer with an epoxy equivalent of 300-800 is placed in a solvent for cross-linking reaction to obtain a polymer solution; the polymer solution can be dip-coated with a polytetrafluoroethylene film. The present invention adopts hydrophilic fluorine-containing polymer resin and epoxy polymer to treat the polytetrafluoroethylene film; wherein, the fluorine group in the polymer and the fluorine substance on the surface of the polytetrafluoroethylene film are firmly combined with each other through van der Waals force, and the accompanying The hydroxyl hydrophilic bond can carry out cross-linking reaction with the epoxy polymer, and at the same time, because the cross-linked epoxy bond is opened to form new hydroxyl groups, and the number of hydroxyl groups will not decrease, so the hydrophilicity will not deteriorate, and the hydroxyl groups formed in this way Since it is cross-linked into a super large polymer chain and has a rigid structure of epoxy, it can protect the tolerance of the hydroxyl group.

Description

technical field [0001] The invention belongs to the technical field of filter materials, and in particular relates to a polytetrafluoroethylene membrane and its hydrophilic treatment method and application. Background technique [0002] The traditional polytetrafluoroethylene biaxially stretched membrane (ePTFE) is used in the field of water filtration, and it needs to be treated with hydrophilicity. There are many ways of hydrophilic treatment, but after a period of filtering and permeating water, the hydrophilicity will be more or less attenuated. or even disappear. For example, in the prior art, there is direct dip-coating of the hydrophilic fluoropolymer resin VOH on the polytetrafluoroethylene biaxially stretched film to improve the hydrophilic performance of the polytetrafluoroethylene biaxially stretched film, but the polymer Hydroxyl groups are easily affected by filtered water flow, temperature, acid-base, and oxidants, which will affect the hydrophilic stability o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/36C02F1/44
CPCB01D67/0088B01D67/0002B01D69/02B01D71/36C02F1/44B01D2323/02B01D2323/46B01D2325/36
Inventor 吴华
Owner SHANGHAI SEVOO ENVIRONMENT TECH
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