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Underwater super-oleophobic oil-water separation mesh membrane and preparation method thereof

An oil-water separation mesh membrane and underwater superoleophobic technology are applied in the field of oil-water separation mesh membrane and its preparation, and can solve the problems of oil-water mixture not suitable for separating oil, the preparation method is not simple enough, and cannot be adapted to strong alkali environment, etc. The preparation cost is low, the oil-water separation effect is good, and the cleaning effect is easy.

Inactive Publication Date: 2012-10-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned oil-water separation mesh is not suitable for separating oil-water mixtures containing a small amount of oil in a large amount of water, and some use fluorine-containing compounds, which will pollute the environment, and some require high-temperature curing, and the manufacturing method is relatively complicated
Although the above four technical solutions all have the effect of oil-water separation, they also have different deficiencies. For example, the manufacturing process is relatively complicated, some use fluorine-containing compounds, and some require high-temperature curing, which is not suitable for a large amount of water containing a small amount of oil. Separation of oil-water mixture, etc.
[0004] The Chinese patent application with the application number 201010531517.5 discloses an oil-water separation network with underwater super-oleophobic properties. Although this network has an oil-water separation effect, this film cannot adapt to the high-salt environment in seawater, and cannot adapt to the strong alkali environment. And photoinitiated polymerization is required, and the preparation method is not simple enough

Method used

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  • Underwater super-oleophobic oil-water separation mesh membrane and preparation method thereof
  • Underwater super-oleophobic oil-water separation mesh membrane and preparation method thereof
  • Underwater super-oleophobic oil-water separation mesh membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, preparation is coated with the oil-water separation omentum of glutaraldehyde cross-linked chitosan

[0038] (1) The 300-mesh copper mesh was successively immersed in ethanol and acetone for ultrasonic cleaning for 5 minutes, soaked in hydrochloric acid for 1 hour, deposited copper particles by electrochemical deposition to increase its roughness, and dried at room temperature;

[0039] (2) At room temperature, add 100ml of water, 2ml of glacial acetic acid, 2g of chitosan, and 0.1ml of 1wt% glutaraldehyde aqueous solution to a 250ml beaker, stir and mix evenly to obtain glutaraldehyde cross-linked chitosan, then the obtained The mass percentage composition of glutaraldehyde crosslinked chitosan in the mixed solution is 2%;

[0040] (3) Dip the copper mesh obtained in step (1) into the mixed solution obtained in step (2) for 30 minutes, then take it out and dry it;

[0041] (4) The mesh obtained in step (3) is immersed in 4wt% sodium hydroxide aqueous sol...

Embodiment 2

[0044] Embodiment 2, preparation is coated with the oil-water separation omentum of chitosan / montmorillonite composite

[0045] (1) The 100-mesh stainless steel mesh was immersed in ethanol and acetone and ultrasonically cleaned for 5 minutes each, and dried at room temperature;

[0046] (2) At room temperature, add 100ml of water, 4ml of hydrochloric acid, 2g of chitosan and 0.5g of montmorillonite into a 250ml beaker, stir and mix evenly with magnetic force to obtain a chitosan / montmorillonite composite, then the obtained mixed solution The mass percentage composition of chitosan / montmorillonite compound is 2.4%;

[0047] (3) Dip the stainless steel wire mesh obtained in step (1) into the mixed solution obtained in step (2) for 10 seconds, then take it out and dry it;

[0048] (4) Immerse the stainless steel wire mesh obtained in step (3) in 1wt% potassium hydroxide aqueous solution, keep it for 10s, then take it out to dry, and form a chitosan / montmorillonite with a thickn...

Embodiment 3

[0051] Embodiment 3, preparation is coated with the oil-water separation omentum of chitosan / polyvinyl alcohol copolymer

[0052] (1) Soak the 400-mesh nylon net in ethanol and acetone for 5 minutes, and then dry it at room temperature;

[0053] (2) At room temperature, add 100ml of water, 3ml of sulfuric acid, 1.5g of chitosan and 1g of polyvinyl alcohol (the degree of polymerization is 1700) into a 250ml beaker, stir and mix evenly to obtain chitosan / polyvinyl alcohol copolymer, Then the mass percent composition of chitosan / polyvinyl alcohol copolymer in the mixed solution obtained is 2.4%;

[0054] (3) Soak the nylon mesh obtained in step (1) in the mixed solution obtained in step (2) for 1 hour, then take it out and dry it;

[0055] (4) Immerse the net obtained in step (3) in 0.5wt% barium hydroxide aqueous solution, keep it for 30min, then take it out to dry, and form a chitosan / polyvinyl alcohol copolymer with a thickness of 2 microns on the surface of the nylon net Th...

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Abstract

The invention discloses an underwater super-oleophobic oil-water separation mesh membrane and a preparation method thereof. The oil-water separation mesh membrane is prepared by coating a micron-thickness chitosan-based polymer coating layer on the mesh wire of a fabric mesh with 100-400 meshes. The oil-water separation mesh membrane is provided with micrometer-scale meshes and the chitosan-based polymer coating layer is provided with protruding structures with a nanoscale width. The preparation method of the oil-water separation mesh membrane comprises the following steps of: (1) cleaning and drying the fabric mesh; (2) dissolving a chitosan-based polymer in acid solution and stirring evenly to obtain mixed solution; (3) immersing the cleaned and dried fabric mesh in the mixed solution, taking out and drying the fabric mesh; and (4) immersing the fabric mesh obtained by the step (3) in alkaline solution, taking out and drying the fabric mesh to obtain the oil-water separation mesh membrane. The oil-water separation mesh membrane provided by the invention has the advantages of large water flux, high oil-water separation speed and good oil-water separation effect, is applicable to treatment of sewage with high oil content, and has good separation effect on normal hexane, petroleum ether, dichloroethane, benzene, animal and vegetable oils and the like.

Description

technical field [0001] The invention relates to an oil-water separation omentum with underwater super-oleophobic properties and a preparation method thereof. Background technique [0002] At present, oil pollutes water bodies very seriously, and oil-water separation technology is one of the key technologies to control water body pollution. At the same time, in the process of sewage treatment, especially the oil pollution treatment in the ocean, in order to adapt to the high-salt environment of seawater, or the strong alkali environment in industry, and reduce the damage to the environment as much as possible, so looking for bio-affinity, environment-friendly, cheap , high separation efficiency, reusable oil-water separation membrane has become an important topic. [0003] Chinese patent applications with publication numbers CN1387932A, CN1721030A, CN101518695A and CN200910217895.3 respectively disclose oil-water separation meshes or oil-water separation meshes with superhyd...

Claims

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Application Information

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IPC IPC(8): B01D71/08
Inventor 冯琳张诗妍卢飞刘娜陶磊高常锐危岩
Owner TSINGHUA UNIV
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