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A kind of self-cleaning aramid fiber membrane and its preparation method and application in gas separation

A self-cleaning and aramid fiber technology, applied in the field of self-cleaning aramid fiber film and its preparation, can solve the problems of low reaction efficiency and poor durability, and achieve high temperature resistance, excellent performance and excellent self-cleaning function. Effect

Active Publication Date: 2016-09-14
国科广化(南雄)新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aramid film with self-cleaning function uses fluorine-containing siloxane in the preparation process, which has the problems of low reaction efficiency and poor durability.

Method used

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  • A kind of self-cleaning aramid fiber membrane and its preparation method and application in gas separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Preparation of a self-cleaning aramid membrane

[0041] (1) Add KOH to dimethyl sulfoxide (DMSO), stir until KOH is completely dissolved, then add aramid II, stir at room temperature to form a solution with a mass fraction of 4%, and the amount of KOH is N equivalent in aramid II 1 times. Then add PEG-1000 with 10% aramid mass to the above solution, stir evenly to form a casting solution, and then vacuum degas the casting solution for use. Then spread the casting solution on a smooth glass plate, and use a scraper to scrape out a 300-400um film. The scraped film was evaporated at 20°C for 10 seconds, and then immersed in water to gel until the film was detached from the glass plate to obtain a gel film. The gel film was soaked in water for 4 days to completely remove the porogen and solvent. Finally, it is treated at 120° C. until the film is completely dry to obtain an aramid fiber film.

[0042] (2) Put the aramid membrane prepared in (1) into the fluori...

Embodiment 2

[0046] Example 2: Preparation of a self-cleaning aramid membrane

[0047] (1) Add potassium tert-butoxide to N,N-dimethylformamide, stir until potassium tert-butoxide is completely dissolved, then add aramid fiber II, stir at room temperature to form a solution with a mass fraction of 5%, tert-butyl The dosage of potassium alkoxide is 0.8 times of N equivalent in aramid fiber II. Then add PVP-25 with 20% aramid mass to the above solution, stir evenly to form a casting solution, and then vacuum degas the casting solution for use. Then spread the casting solution on a smooth glass plate, and use a scraper to scrape out a 300-400um film. The scraped film was evaporated at 30° C. for 30 seconds, and then immersed in water to gel to obtain a gel film. The gel film was soaked in water for 7 days to completely remove the pore-forming agent and solvent. Finally, it is treated at 150° C. until the film is completely dry to obtain an aramid fiber film.

[0048] (2) Put the aramid fil...

Embodiment 3

[0049] Example 3: Preparation of a self-cleaning aramid membrane

[0050] (1) Add NaH to N-methylpyrrolidone, stir until NaH is completely dissolved, then add aramid fiber III, stir at room temperature to form a solution with a mass fraction of 8%, and the amount of NaH is 1.5 times the N equivalent in aramid fiber III . Then add PEG-600 with 30% aramid weight to the above solution, stir evenly to form a casting solution, and then vacuum degas the casting solution for use. Then spread the casting solution on a smooth glass plate, and use a scraper to scrape out a 300-400um film. The scraped film evaporated the solvent at 25°C for 20 seconds, and then sank into water to gel to obtain a gel film. The gel film was soaked in water for 7 days to completely remove the pore-forming agent and solvent. Finally, it is treated at 80° C. until the film is completely dry to obtain an aramid fiber film.

[0051] (2) Put the aramid membrane prepared in (1) into the fluorine-containing epo...

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Abstract

The invention belongs to the technical field of aramid fiber film preparation, and discloses self-cleaning aramid fiber film, a preparation method thereof, and applications thereof in gas separation. The method includes steps of: adding aramid fiber into a mixed solution of an organic solvent and a strong alkali, stirring to obtain a uniform solution, adding a pore-forming agent, stirring and degassing, casting on a substrate to form film, immersing the film together with the substrate into water, allowing the film to gel in water and be separated from the substrate so as to obtain gel film, drying the gel film to obtain aramid fiber film, dipping the prepared aramid fiber film into fluorine-containing epoxy resin dispersed by a solvent, taking the aramid fiber film out, and heating the aramid fiber film to obtain the self-cleaning aramid fiber film. A film casting liquid is prepared by dispersing the aramid fiber through the strong alkali, and then the aramid fiber film is prepared by a solution phase transfer method, thus maintaining the good molecular structure integrity of the aramid fiber, and preserving inherent performances of the aramid fiber, thus as high-temperature resistance, solvent tolerance and high strength. Then the fluorine-containing epoxy resin is grafted into the aramid fiber film to obtain the aramid fiber film with hydrophobicity or amphiphobicity, thus obtaining the self-cleaning aramid fiber film.

Description

technical field [0001] The invention belongs to the technical field of aramid membrane preparation, and in particular relates to a self-cleaning aramid membrane, a preparation method thereof and an application in gas separation. Background technique [0002] Since 1960, Leob and Sourirjan used cellulose acetate to produce a reverse osmosis membrane with high flux and high rejection rate for the desalination of brackish water, and membrane separation technology has developed rapidly in recent decades. As a new technology for efficient separation, purification, concentration and purification, membrane separation technology has the advantages of convenient operation, simple equipment, safe working environment, energy saving and environmental protection. So far, it has been widely used in seawater desalination treatment, organic matter concentration, gas separation, etc. field. [0003] As an important part of membrane separation technology, gas separation membrane has the adva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/02B01D53/22
Inventor 胡继文吴艳胡盛逾涂园园刘锋刘国军林树东杨洋苗磊李妃
Owner 国科广化(南雄)新材料研究院有限公司
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