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Hydrophilic modification treatment method of semi-permeable filter membrane and polymer plastic film

A plastic film and processing method technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of complicated procedures, complicated equipment, high cost, etc., and achieve a wide range of uses, simple process, and low production cost. Effect

Active Publication Date: 2021-04-02
亚美滤膜(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing disclosed methods for hydrophilic modification of semi-permeable filter membranes or polymer plastic films are limited by the disadvantages of complicated procedures, high costs, and complicated equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Manufacture of 0.2 micron pore size hydrophilic composite polytetrafluoroethylene microporous membrane

[0036] According to the weight ratio of 1:2:0.5:0.3:96.2, mix polyethyleneimine-chloromethoxypropylene macromolecule, potassium hydroxide, tetrabutylammonium bromide, polyvinyl alcohol, and pure water evenly Mix and dissolve to prepare the filter membrane post-treatment modification solution. Then, soak the polytetrafluoroethylene composite filter membrane with a hydrophobic 0.2 micron pore size coated polypropylene non-woven fabric in ethanol solvent to fully wet the filter membrane for 1 minute at room temperature. After that, take out the filter membrane and shake it to remove excess ethanol, then soak the filter membrane in the above-mentioned modification solution for 1 minute, finally take out the filter membrane and scrape off the excess modification solution on the surface, and immediately bake at 90°C for 24 hours . After the high-temperature treatment, the...

Embodiment 2

[0039] Manufacture of 0.2 micron pore size hydrophilic single-type polytetrafluoroethylene microporous membrane

[0040] All steps are the same as in Example 1, except the following two points: one, use a single type polytetrafluoroethylene microporous membrane (that is, the filter membrane is not coated with any material) to replace the composite polytetrafluoroethylene microporous membrane; two, Since the single-type PTFE filter membrane does not have any covering material, the filter membrane is highly flexible, so the surrounding of the filter membrane needs to be fixed with a frame to avoid wrinkling and deformation during the treatment of the filter membrane.

[0041] The final product has a contact angle of less than 10 degrees for pure water. The final product is soaked in 10% by weight sodium hydroxide aqueous solution at room temperature for 24 hours, after being thoroughly rinsed with pure water and dried, the contact angle to pure water is still less than 10 degree...

Embodiment 3

[0043] Manufacture of 0.2 micron pore size hydrophilic single-type polyvinylidene fluoride microporous membrane

[0044] According to the weight ratio of 0.5:0.2:2:3:94.3, polyethyleneimine-chloromethoxypropylene polymer, potassium hydroxide, tetrabutylammonium bromide, polyvinyl alcohol, and pure water are evenly mixed Mix and dissolve to prepare the filter membrane post-treatment modification solution. Then, at room temperature, the hydrophobic 0.2 micron pore size single-type polyvinylidene fluoride microporous membrane filter was soaked in ethanol solvent to fully wet the filter membrane for 1 minute. After that, take out the filter membrane and shake it to remove excess ethanol, then soak the filter membrane in the above-mentioned modification solution for 1 minute, finally take out the filter membrane and scrape off the excess modification solution on the surface, and immediately bake at 90°C for 24 hours . After the high-temperature treatment, the filter membrane was ...

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Abstract

The invention provides a hydrophilic modification treatment method, comprising the following process: the hydrophobic semi-permeable filter membrane or polymer plastic film soaked by ethanol, isopropanol or acetone is treated with a hydrophilic modification treatment solution Treat the air contact surface of the semi-permeable filter membrane or polymer plastic film, and then make it undergo a cross-linked polymer chemical reaction to form a network and cross-linked polymer layer, covering the semi-permeable filter membrane or polymer plastic film The air contact surface; the hydrophilic modification treatment liquid is composed of macromolecules with amine groups and epoxy groups or macromolecules with amine groups and precursors capable of forming epoxy groups, containing hydrocarbon groups or amino groups polymers, tetraalkylamine halides, and aqueous solutions of strong bases. The preparation method of the present invention has simple process, high efficiency and low production cost, and can modify the hydrophobic semi-permeable filter membrane or polymer plastic film to be hydrophilic, but does not change the properties of the filter membrane or film itself, and its hydrophilicity is permanent.

Description

technical field [0001] The invention relates to a hydrophilic modification treatment method, in particular to a hydrophilic modification treatment method for semi-permeable filter membranes and polymer plastic films. Background technique [0002] Semi-permeable membranes, such as reverse osmosis membranes, ultrafiltration membranes, microporous membranes, etc., have the characteristics of selectively separating different components in fluids only depending on the pressure difference between upstream and downstream. Commonly used material in the craft field. In terms of material surface properties, semi-permeable membranes can be roughly divided into hydrophilic and hydrophobic. Commonly used semi-permeable membrane materials include polysulfone, polyethersulfone, nylon, polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, polyethylene, etc. Fluorine-containing polymers such as polytetrafluoroethylene and polyvinylidene fluoride have high chemical stability, hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34B01D71/36C08J7/16C08L25/06C08L69/00
CPCB01D67/0006B01D69/02B01D71/34B01D71/36C08J7/16B01D2325/36B01D2323/02C08J2325/06C08J2369/00C08J2479/02
Inventor 胡鹤滨
Owner 亚美滤膜(南通)有限公司