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Modified ultrafiltration membrane and modification method thereof

An ultrafiltration membrane and modification technology, which is applied in the field of modified ultrafiltration membrane and its modification, can solve the problems such as the decline of ultrafiltration membrane separation performance, the shortened service life of ultrafiltration membrane, and the decline of sewage treatment capacity, so as to achieve good resistance The effect of pollution performance, good hydrophilicity, and good use effect

Active Publication Date: 2022-04-01
陈泉学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, ultrafiltration membranes are mostly made of high-molecular organic materials, which exhibit strong hydrophobicity under the condition of high mechanical strength, which leads to specific adsorption in the process of sewage treatment. In particular, it has a high adsorption effect on organic matter in sewage. During the long-term treatment process, organic pollution will lead to a significant decline in the separation performance of the ultrafiltration membrane, and the sewage treatment capacity will also decrease, eventually leading to ultrafiltration. The service life of the membrane is greatly shortened
[0004] At present, the way to improve the anti-pollution ability of ultrafiltration membranes is mainly to improve the hydrophilicity of ultrafiltration membranes through hydrophilic modification, thereby reducing the adsorption of organic pollution. Generally, the methods of hydrophilic modification mainly include blending modification and grafting. Branch modification, neither of the two modification methods can fundamentally solve the problem of poor hydrophilicity, and will lead to a decrease in other properties of the membrane while improving the hydrophilicity

Method used

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  • Modified ultrafiltration membrane and modification method thereof
  • Modified ultrafiltration membrane and modification method thereof
  • Modified ultrafiltration membrane and modification method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] According to the mass ratio of 10:10:3:50, mix polysulfone, sulfonated polysulfone, Tween 20 and N,N-dimethylformamide, stir for 30 minutes, and pass the mixed solution through a 0.2 μm microporous membrane for filtration. Filtrate, keep the filtered solution at -0.1Mpa vacuum, keep it at room temperature, let it stand for degassing for 5min, and obtain the casting solution;

[0029] The defoamed casting solution is evenly coated on the non-woven fabric, and the flat film scraping machine scrapes the film to form a scraped film with a thickness of 200 μm. After scraping the film, it is evaporated at normal temperature and pressure for 1 min, and the scraped film is soaked in a mass concentration of Rinse in 20% aqueous solution of N,N-dimethylformamide for 2 minutes to obtain a flat ultrafiltration membrane;

[0030] Soak the above-mentioned flat ultrafiltration membrane again in an aqueous solution of methacryloyloxyethylalkyldimethylammonium bromide with a mass concen...

Embodiment 2

[0033] According to the mass ratio of 20:15:5:80, mix polysulfone, sulfonated polysulfone, Tween 80 and N,N-dimethylacetamide, stir for 30 minutes, and pass the mixed solution through a 0.2 μm microporous membrane for filtration. Filtrate, keep the filtered solution at -0.1Mpa vacuum, keep it at room temperature, let it stand for degassing for 5min, and obtain the casting solution;

[0034] The defoamed casting solution is evenly coated on the non-woven fabric, and the film is scraped by a flat film scraping machine. The thickness of the scraped film is 200 μm. After scraping the film, it is evaporated at normal temperature and pressure for 2 minutes. Rinse in 20% aqueous solution of N,N-dimethylacetamide for 2 minutes to obtain a flat ultrafiltration membrane;

[0035] Soak the above-mentioned flat ultrafiltration membrane again in an aqueous solution of methacryloyloxyethylalkyldimethylammonium bromide with a mass concentration of 30%, and at the same time irradiate with ult...

Embodiment 3

[0038] According to the mass ratio of 15:10:4:60, mix polysulfone, sulfonated polysulfone, polyoxyethylene octylphenol ether and N-methylpyrrolidone, stir for 30 minutes, and pass the mixed solution through a 0.2 μm microporous membrane for filtration. Filtrate, keep the filtered solution at -0.1Mpa vacuum, keep it at room temperature, let it stand for degassing for 5min, and obtain the casting solution;

[0039] The defoamed casting solution is evenly coated on the non-woven fabric, and the flat film scraping machine scrapes the film to form a scraped film with a thickness of 200 μm. After scraping the film, it is evaporated at normal temperature and pressure for 1 min, and the scraped film is soaked in a mass concentration of Rinse in 20% aqueous solution of N-methylpyrrolidone for 2 minutes to obtain a flat ultrafiltration membrane;

[0040] Soak the above-mentioned flat ultrafiltration membrane again in an aqueous solution of methacryloyloxyethylalkyldimethylammonium bromi...

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Abstract

The invention proposes a modified ultrafiltration membrane and a modification method thereof. The modified ultrafiltration membrane mainly includes polysulfone, sulfonated polysulfone, surfactant and solvent. Scraping and wet coagulation of the liquid to obtain a flat ultrafiltration membrane, and then using reactive surfactants and ultraviolet light to activate and graft modification of the modified solution to achieve the purpose of surface modification of the ultrafiltration membrane. The modified ultrafiltration membrane has good mechanical strength and strong hydrophilic ability, can effectively prevent organic pollution, and can still maintain high water flux during long-term use, so it has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment equipment, in particular to a modified ultrafiltration membrane and a modification method thereof. Background technique [0002] Ultrafiltration is a high-efficiency separation technology, which has a good effect on removing colloids, bacteria, viruses and various organic substances in water. Compared with traditional separation technologies, it has the advantages of simple operation steps and easy process implementation. Therefore, ultrafiltration Filtration technology has been widely used in people's lives, especially in the field of sewage treatment. [0003] However, ultrafiltration membranes are mostly made of high-molecular organic materials, which exhibit strong hydrophobicity under the condition of high mechanical strength, which makes specific adsorption very easy to occur in the process of sewage treatment. In particular, it has a high adsorption effect on organic matter in sew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/68B01D69/06B01D69/02B01D67/00
CPCB01D71/82B01D71/68B01D69/06B01D69/02B01D67/0093B01D67/0013B01D67/0011B01D67/0006B01D2325/36B01D2325/24
Inventor 陈泉学
Owner 陈泉学
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