A kind of organic solvent-resistant ultrafiltration membrane and its preparation method and application

Abstract

The invention proposes an organic solvent-resistant ultrafiltration membrane and its preparation method and application. The ultrafiltration membrane is prepared from a conventional casting solution, and the ultrafiltration membrane is modified by ethylenediamine tetrahydrofuran solution and nylon 6 organic Solution modification, using ethylenediamine to graft and modify the inner surface of the membrane pores of the ultrafiltration membrane, and nylon 6 to graft and modify the surface of the ultrafiltration membrane to enhance the surface solvent resistance of the ultrafiltration membrane. The present invention The preparation method is simple, and the prepared ultrafiltration membrane has good solvent resistance, and can be applied to industrial sewage treatment.

Description

technical field

[0001] The invention relates to the technical field of sewage treatment equipment, in particular to an ultrafiltration membrane resistant to organic solvents and its preparation method and application. Background technique

[0002] Ultrafiltration is one of the membrane separation technologies driven by pressure. It uses the membrane pore size to separate macromolecules and small molecules. Therefore, ultrafiltration membranes are often used in sewage purification and treatment applications.

[0003] The pollutants in common domestic sewage are mostly organic polymer pollutants and some bacteria. The performance of conventional ultrafiltration membranes is sufficient to separate and treat these pollutants. The ultrafiltration membrane material itself is an organic material, so industrial sewage will have a certain erosion effect on the ultrafiltration membrane body. Over time, the membrane pores will expand and the membrane thickness will become thinner, thus...

Examples

Embodiment 1

[0035] Weigh 100g of polyetherimide, 600g of N-methylpyrrolidone and 50g of polyvinylpyrrolidone, mix and stir for 1 hour, and defoam in a vacuum defoamer for 20 minutes to obtain a casting solution;

[0036] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 100 μm. After the scraped film, it is dried at normal temperature and pressure for 1 min. The dried film is immersed in deionized water, and the temperature of the deionized water is maintained at 20°C, immersion time 10min, take out to obtain ultrafiltration membrane;

[0037] Add 50g of ethylenediamine to 400g of tetrahydrofuran, mix and cool down to 0°C, stir for 10 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 1 hour, take it out and place it at room temperature Drying for 20min under normal pressure, obtain the first modified ultrafiltration membrane; ...

Embodiment 2

[0040] Weigh 200g of polysulfone, 800N,N-dimethylformamide and 100g of polyvinyl alcohol, mix, stir for 2h, and defoam in a vacuum defoamer for 30min to obtain a casting solution;

[0041] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 400 μm. After scraping, dry it at normal temperature and pressure for 2 minutes. The dried film is immersed in ethanol, and the temperature of the deionized water is kept at 30. ℃, immersion time 10min, take out to obtain ultrafiltration membrane;

[0042] Add 150g of ethylenediamine to 500g of tetrahydrofuran, mix and cool down to 10°C, stir for 20 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 2 hours, take it out and place it at room temperature Dry 40min under normal pressure, obtain the modified ultrafiltration membrane for the first time;

[0043] Add magnesium carbonate...

Embodiment 3

[0045] Weigh 150g of polyethersulfone, 700N,N-dimethylacetamide and 70g of polyvinylpyrrolidone, mix, stir for 1.5h, and defoam in a vacuum defoamer for 30min to obtain a casting solution;

[0046] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 200 μm. After scraping, dry it at normal temperature and pressure for 1 min, and immerse the dried film in a mixed solution of deionized water and ethanol. The temperature of the mixed solution is 30°C, the immersion time is 20min, and the ultrafiltration membrane is obtained by taking it out;

[0047] Add 100g of ethylenediamine to 450g of tetrahydrofuran, mix and cool down to 8°C, and stir for 15 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 1 hour, take it out and place it at room temperature Drying for 20min under normal pressure, obtain the first modified ultrafi...

technical field

[0001] The invention relates to the technical field of sewage treatment equipment, in particular to an ultrafiltration membrane resistant to organic solvents and its preparation method and application. Background technique

[0002] Ultrafiltration is one of the membrane separation technologies driven by pressure. It uses the membrane pore size to separate macromolecules and small molecules. Therefore, ultrafiltration membranes are often used in sewage purification and treatment applications.

[0003] The pollutants in common domestic sewage are mostly organic polymer pollutants and some bacteria. The performance of conventional ultrafiltration membranes is sufficient to separate and treat these pollutants. The ultrafiltration membrane material itself is an organic material, so industrial sewage will have a certain erosion effect on the ultrafiltration membrane body. Over time, the membrane pores will expand and the membrane thickness will become thinner, thus...

Examples

Embodiment 1

[0035] Weigh 100g of polyetherimide, 600g of N-methylpyrrolidone and 50g of polyvinylpyrrolidone, mix and stir for 1 hour, and defoam in a vacuum defoamer for 20 minutes to obtain a casting solution;

[0036] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 100 μm. After the scraped film, it is dried at normal temperature and pressure for 1 min. The dried film is immersed in deionized water, and the temperature of the deionized water is maintained at 20°C, immersion time 10min, take out to obtain ultrafiltration membrane;

[0037] Add 50g of ethylenediamine to 400g of tetrahydrofuran, mix and cool down to 0°C, stir for 10 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 1 hour, take it out and place it at room temperature Drying for 20min under normal pressure, obtain the first modified ultrafiltration membrane; ...

Embodiment 2

[0040] Weigh 200g of polysulfone, 800N,N-dimethylformamide and 100g of polyvinyl alcohol, mix, stir for 2h, and defoam in a vacuum defoamer for 30min to obtain a casting solution;

[0041] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 400 μm. After scraping, dry it at normal temperature and pressure for 2 minutes. The dried film is immersed in ethanol, and the temperature of the deionized water is kept at 30. ℃, immersion time 10min, take out to obtain ultrafiltration membrane;

[0042] Add 150g of ethylenediamine to 500g of tetrahydrofuran, mix and cool down to 10°C, stir for 20 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 2 hours, take it out and place it at room temperature Dry 40min under normal pressure, obtain the modified ultrafiltration membrane for the first time;

[0043] Add magnesium carbonate...

Embodiment 3

[0045] Weigh 150g of polyethersulfone, 700N,N-dimethylacetamide and 70g of polyvinylpyrrolidone, mix, stir for 1.5h, and defoam in a vacuum defoamer for 30min to obtain a casting solution;

[0046] Use a flat-plate scraping machine to scrape the casting solution. The thickness of the scraped film is 200 μm. After scraping, dry it at normal temperature and pressure for 1 min, and immerse the dried film in a mixed solution of deionized water and ethanol. The temperature of the mixed solution is 30°C, the immersion time is 20min, and the ultrafiltration membrane is obtained by taking it out;

[0047] Add 100g of ethylenediamine to 450g of tetrahydrofuran, mix and cool down to 8°C, and stir for 15 minutes to obtain a membrane pore modification solution, immerse the ultrafiltration membrane in the membrane pore modification solution, graft and modify it for 1 hour, take it out and place it at room temperature Drying for 20min under normal pressure, obtain the first modified ultrafi...

Images