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Kevlar nanofiber composite forward osmosis membrane, and preparation method and application thereof

A nanofiber, forward osmosis membrane technology, applied in the field of membrane materials, can solve problems such as reducing the strength of aramid fibers, achieve excellent high strength, good solvent resistance, and avoid the use of strong corrosive reagents.

Inactive Publication Date: 2015-04-29
广州粤禹环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of a large amount of hydrophilic monomers in the synthesis of the modified para-aramid fiber in this method will reduce the strength of the para-aramid fiber

Method used

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  • Kevlar nanofiber composite forward osmosis membrane, and preparation method and application thereof
  • Kevlar nanofiber composite forward osmosis membrane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of a Kevlar nanofiber composite forward osmosis membrane of this embodiment, the specific operation steps are as follows:

[0035] (1) Put 2g of Kevlar fibers (provided by Dupont) in a round bottom flask, add 2g of auxiliary methanol, 1g of potassium tert-butoxide and 40g of organic solvent dimethyl sulfoxide, mechanically stir and disperse for 2 days at room temperature to form a uniform Stable black-red Kevlar nanofiber dispersion solution;

[0036] (2) Add 20% porogen PEG-600 of Kevlar fiber mass to the solution formed in step (1), mechanically stir for 5 hours to make it form a uniform and stable casting solution, and stand for defoaming for 12 hours for use;

[0037] (3) spreading the film-casting solution of step (2) on a clean glass plate, scraping a film with a thickness of 300um with a film scraper, and immersing it in a distilled hydrogel bath to form a gel film;

[0038] (4) Remove the gel film in step (3) from the glass plate and soak...

Embodiment 2

[0043] The preparation method of a Kevlar nanofiber composite forward osmosis membrane of this embodiment, the specific operation steps are as follows:

[0044] (1) Put 2g of Kevlar fibers (provided by Dupont) in a round bottom flask, add 2g of auxiliary methanol, 1g of potassium tert-butoxide and 40g of organic solvent dimethyl sulfoxide, mechanically stir and disperse for 2 days at room temperature to form a uniform Stable black-red Kevlar nanofiber dispersion solution;

[0045] (2) Add porogen PEG-1000 with 20% Kevlar fiber mass to the solution formed in step (1), mechanically stir for 5 hours to form a uniform and stable casting solution, and stand for defoaming for 12 hours for later use;

[0046] (3) spreading the film-casting solution of step (2) on a clean glass plate, scraping a film with a thickness of 300um with a film scraper, and immersing it in a distilled hydrogel bath to form a gel film;

[0047] (4) Remove the gel film in step (3) from the glass plate and soak ...

Embodiment 3

[0052] The preparation method of a Kevlar nanofiber composite forward osmosis membrane of this embodiment, the specific operation steps are as follows:

[0053] (1) Put 2g of Kevlar fibers (provided by Dupont) in a round bottom flask, add 2g of auxiliary methanol, 1g of potassium tert-butoxide and 40g of organic solvent dimethyl sulfoxide, mechanically stir and disperse for 2 days at room temperature to form a uniform Stable black-red Kevlar nanofiber dispersion solution;

[0054] (2) Add porogen PEG-2000 with 20% Kevlar fiber mass to the solution formed in step (1), mechanically stir for 5 hours to make it form a uniform and stable casting solution, and stand for defoaming for 12 hours for later use;

[0055] (3) spreading the film-casting solution of step (2) on a clean glass plate, scraping a film with a thickness of 300um with a film scraper, and immersing it in a distilled hydrogel bath to form a gel film;

[0056] (4) Remove the gel film in step (3) from the glass plate...

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Abstract

The invention belongs to the technical field of membrane materials, and discloses a Kevlar nanofiber composite forward osmosis membrane, and a preparation method and application thereof. The preparation method comprises the following steps: stirring Kevlar fibers with an auxiliary agent, strong base and an organic solvent and dispersing to form a stable Kevlar nanofiber dispersion solution; adding a pore-foaming agent, and uniformly stirring to obtain a membrane casting solution; coating a glass plate with the membrane casting solution through blade coating to form a membrane, and soaking into a gel bath to form a gel membrane; soaking the gel membrane into an organic solution for solvent replacement to obtain a Kevlar nanofiber porous membrane; using the porous membrane as a substrate, diluting the Kevlar nanofiber dispersion solution, forming a membrane on the substrate through blade coating, soaking into the gel bath, taking out, and airing to obtain the Kevlar nanofiber composite forward osmosis membrane. The Kevlar nanofiber composite forward osmosis membrane has the advantages of high strength, high water flux and high salt intercepting rate, and is applicable to the field of water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a Kevlar nanofiber composite forward osmosis membrane and a preparation method and application thereof. Background technique [0002] Forward osmosis is a phenomenon that uses the osmotic pressure difference on both sides of the membrane (rather than external pressure) as the driving force for water to diffuse through the membrane, promoting the net migration of water through the selective permeable membrane, which can be used to directly extract drinking water from sewage water. Compared with the membrane separation technology driven by external pressure, the most notable feature of membrane separation technology is that it does not require external pressure or operates at a very low external pressure, and the membrane fouling is relatively light, and it can continue to operate for a long time without cleaning. In recent years there has been a tendency to...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44
Inventor 胡继文姜婷婷靳涛胡盛逾于发猛涂园园
Owner 广州粤禹环保科技有限公司
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