Method for preparing environment-friendly hydrophilic porous coating used for modifying surface of porous membrane

A technology of surface modification and porous coating, which is applied in the direction of coating, etc., can solve the problems that cannot solve the problem of hydrophilicity of the porous film of the substrate, and achieve the effects of improving heat shrinkage resistance, easy operation of the preparation process, and simple preparation process

Active Publication Date: 2015-08-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] China invented "porous membrane and multilayer porous membrane", application number 201380017992.2; China invented "microporous membrane", application number 201280046704.1; China invented "porous membrane", application number 200410095836.0; China invented "multilayer porous membrane", application number 201080010198.1, are all about the research on the porous membrane of polyolefin materials, but none of them can solve the hydrophilic problem of the substrate porous membrane

Method used

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  • Method for preparing environment-friendly hydrophilic porous coating used for modifying surface of porous membrane
  • Method for preparing environment-friendly hydrophilic porous coating used for modifying surface of porous membrane
  • Method for preparing environment-friendly hydrophilic porous coating used for modifying surface of porous membrane

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Effect test

Embodiment 1

[0023] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve it until the solution turns purple-black with no solid residues, transfer the above solution to a 500mL volumetric flask, continue to add deionized water until it is close to the capacity Use a plastic dropper to titrate to the graduation line of the bottle. Turn the volumetric flask upside down until the solution is evenly mixed to obtain 500 mL of potassium permanganate solution with a molar concentration of 0.25moL / L. In addition, the mass percentage is 37%. 24.66g of the hydrochloric acid solution, and 500 mL of the hydrochloric acid solution with a molar concentration of 0.5moL / L was prepared in a volumetric flask using the same steps as above;

[0024] (2) Mix the potassium permanganate solution and the hydrochloric acid solution in step (1) into a 400mL beaker with a volume ratio of 1:1, and magnetically stir for 10 hours to obtain 400mL of permanganic acid with a ...

Embodiment 2

[0030] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve it until the solution becomes purple-black with no solid residues, transfer the above solution into a 500mL volumetric flask, continue to add deionized water until it is close to the capacity Use a plastic dropper to titrate to the graduation line of the bottle. Turn the volumetric flask upside down until the solution is evenly mixed to obtain 500 mL of potassium permanganate solution with a molar concentration of 0.25moL / L. In addition, the mass percentage is 37%. 24.66g of the hydrochloric acid solution, and 500 mL of the hydrochloric acid solution with a molar concentration of 0.5moL / L was prepared in a volumetric flask using the same steps as above;

[0031] (2) Pour the potassium permanganate solution and the hydrochloric acid solution in step (1) into a 400mL beaker at a volume ratio of 1:1, and magnetically stir for 12h to obtain 400mL of permanganic acid with a molar conc...

Embodiment 3

[0037] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve it until the solution becomes purple-black with no solid residues, transfer the above solution into a 500mL volumetric flask, continue to add deionized water until it is close to the capacity Use a plastic dropper to titrate to the graduation line of the bottle. Turn the volumetric flask upside down until the solution is evenly mixed to obtain 500 mL of potassium permanganate solution with a molar concentration of 0.25moL / L. In addition, the mass percentage is 37%. 24.66g of the hydrochloric acid solution, and 500 mL of the hydrochloric acid solution with a molar concentration of 0.5moL / L was prepared in a volumetric flask using the same steps as above;

[0038] (2) Pour the potassium permanganate solution and hydrochloric acid solution in step (1) into a 400mL beaker at a volume ratio of 1:1, and magnetically stir for 11h to obtain 400mL permanganic acid with a molar concentr...

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Abstract

The invention relates to a method for preparing an environment-friendly hydrophilic porous coating used for modifying the surface of a porous membrane, and belongs to the technical field of porous membrane coating production. The method includes the following steps: soaking the porous membrane subjected to oxidation by a potassium permanganate/hydrochloric acid solution into a hydroxy ethyl cellulose (HEC) emulsion containing or without containing aluminium oxide particles for 10-14 hours; taking out and placing into a refrigerator for 10-14 hours; then freeze-drying for 2-4 hours to obtain the hydrophilic porous coating. The preparation technology of the coating is simple and environment-friendly; the hydrophilic coating provided by the invention not only has a porous structure but also enables the porous membrane to have excellent wettability; in addition, the heat-shrink resistance of the holes is greatly improved; the coating has a wide application prospect in membrane separation of hydrophilic mediums and the battery industry.

Description

Technical field [0001] The invention relates to a preparation method of an environmentally friendly hydrophilic porous coating for surface modification of a porous membrane, belonging to the technical field of porous membrane coating modification production. Background technique [0002] Porous membrane is a kind of separation membrane with 10 million to 100 million pores per square centimeter, 70~80% of the total volume of porosity, uniform pore size distribution, and pore size range between 0.02~20μm. It is widely used It has important development prospects in industries such as membrane separation, membrane permeation and battery separators. At present, porous membrane materials are mainly polyolefin materials, which refer to polymers of ethylene, propylene or higher olefins, such as polyethylene and polypropylene, which are rich in raw materials, low in price, easy to process, and have good chemical resistance and excellent stability. It is a kind of polymer material with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/40C09D101/28C09D7/12C08L23/12C08L23/06
Inventor 廖海洋洪浩群张海燕
Owner GUANGDONG UNIV OF TECH
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