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A preparation method of an environmentally friendly hydrophilic porous coating for surface modification of porous membranes

A technology of porous coating and surface modification, applied in the direction of coating, etc., can solve the problem of inability to solve the hydrophilic problem of the porous film of the matrix, and achieve the effect of improving heat shrinkage performance, simple preparation process, and easy operation of the preparation process.

Active Publication Date: 2018-07-31
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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  • A preparation method of an environmentally friendly hydrophilic porous coating for surface modification of porous membranes
  • A preparation method of an environmentally friendly hydrophilic porous coating for surface modification of porous membranes
  • A preparation method of an environmentally friendly hydrophilic porous coating for surface modification of porous membranes

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Embodiment 1

[0023] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve until the solution turns purple black, and there is no solid residue, transfer the above solution into a 500mL volumetric flask, and continue to add deionized water until it is close to the capacity Change to the scale line of the bottle, use a rubber dropper to titrate to the scale line, turn the volumetric flask upside down until the solution is evenly mixed, and then obtain 500mL of potassium permanganate solution with a molar concentration of 0.25moL / L, and weigh 37% 24.66g of hydrochloric acid solution, with the above-mentioned same steps, the molar concentration of 0.5moL / L hydrochloric acid solution 500mL is prepared in the volumetric flask;

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

Embodiment 2

[0030] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve until the solution becomes purple-black with no solid residue, transfer the above solution into a 500mL volumetric flask, and continue to add deionized water until it reaches the capacity Change to the scale line of the bottle, use a rubber dropper to titrate to the scale line, turn the volumetric flask upside down until the solution is evenly mixed, and then obtain 500 mL of potassium permanganate solution with a molar concentration of 0.25 moL / L, and weigh 37% by mass 24.66g of hydrochloric acid solution, with the above-mentioned same steps, the molar concentration of 0.5moL / L hydrochloric acid solution 500mL is prepared in the volumetric flask;

[0031] (2) Mix the potassium permanganate solution and hydrochloric acid solution in step (1) with a volume ratio of 1:1 and pour them into a 400mL beaker, stir magnetically for 12 hours to obtain 400mL permanganate with a molar co...

Embodiment 3

[0037] (1) Weigh 19.75g of potassium permanganate into a beaker, add deionized water to fully dissolve until the solution becomes purple-black with no solid residue, transfer the above solution into a 500mL volumetric flask, and continue to add deionized water until it reaches the capacity Change to the scale line of the bottle, use a rubber dropper to titrate to the scale line, turn the volumetric flask upside down until the solution is evenly mixed, and then obtain 500mL of potassium permanganate solution with a molar concentration of 0.25moL / L, and weigh 37% 24.66g of hydrochloric acid solution, with the above-mentioned same steps, the molar concentration of 0.5moL / L hydrochloric acid solution 500mL is prepared in the volumetric flask;

[0038] (2) Mix the potassium permanganate solution and hydrochloric acid solution in step (1) with a volume ratio of 1:1 and pour them into a 400mL beaker, stir magnetically for 11 hours to obtain 400mL permanganate with a molar concentratio...

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Abstract

The invention relates to a method for preparing an environmentally friendly hydrophilic porous coating used for surface modification of porous membranes, belonging to the technical field of production of porous membrane coatings; the method of the invention is: the porous The membrane is immersed in the hydroxyethyl cellulose emulsion solution containing alumina particles (or not) for 10-14 hours, taken out and placed in the refrigerator for 10-14 hours, and then freeze-dried for 2-4 hours to obtain a hydrophilic porous coating. The coating preparation process of the present invention is simple and environmentally friendly. The hydrophilic coating prepared by the present invention not only has a porous structure to endow the porous membrane with excellent wettability, but also greatly improves the thermal shrinkage resistance of the porous film. , and has broad application prospects in the membrane separation industry of hydrophilic media and the battery industry.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly hydrophilic porous coating used for surface modification of porous membranes, and belongs to the technical field of porous membrane coating modification production. Background technique [0002] Porous membrane is a separation membrane containing 10-100 million pores per square centimeter, with a porosity of 70-80% of the total volume, uniform pore size distribution, and a pore size range of 0.02-20 μm. It is widely used It has important development prospects in industries such as membrane separation, membrane permeation and battery diaphragm. At present, the material of porous membrane is mainly polyolefin material, which refers 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 shape, and have good chemical resistance and excellent stability. It has excellent formability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42C08J9/40C09D101/28C09D7/61C08L23/12C08L23/06
Inventor 廖海洋洪浩群张海燕
Owner GUANGDONG UNIV OF TECH
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