Oil-water separation mesh film with acid-base salt stabilizing function and with underwater super-oleophobic property and preparation method thereof

An oil-water separation mesh membrane and a hydrophilic polymer technology are applied in the field of oil-water separation mesh membrane and its preparation, which can solve the problems of loss of oil-water separation, easy dissolution, etc. Effect

Active Publication Date: 2013-06-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of omentum has an important disadvantage, that is, it is easy to dissolve under acidic conditions and lose the effect of oil-water separation. Therefore, it is necessary to modify the omentum to enhance the stability of the omentum in harsh environments.

Method used

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  • Oil-water separation mesh film with acid-base salt stabilizing function and with underwater super-oleophobic property and preparation method thereof
  • Oil-water separation mesh film with acid-base salt stabilizing function and with underwater super-oleophobic property and preparation method thereof
  • Oil-water separation mesh film with acid-base salt stabilizing function and with underwater super-oleophobic property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, preparation coats the oil-water separation omentum of modified chitosan polyvinyl alcohol mixture

[0038] (1) immerse the 300-mesh copper mesh in ethanol and acetone and ultrasonically clean each for 5 minutes, soak in hydrochloric acid for 1 hour, deposit copper particles by electrochemical deposition, increase its roughness, and dry at room temperature;

[0039] (2) At normal temperature, add 100ml of water, 2ml of glacial acetic acid, and 2g of chitosan (80%-95% degree of deacetylation) into a 250ml beaker, stir and mix evenly to obtain a 2% chitosan solution.

[0040] (3) add 100ml water, 6g polyvinyl alcohol (molecular weight is 1750) in 250ml round bottom flask, reflux 1 hour at 90 ℃, be cooled to room temperature, obtain 6% polyvinyl alcohol solution, above-mentioned chitosan solution and The polyvinyl alcohol solution is uniformly mixed according to the mass ratio of 4:1 to obtain a mixed solution.

[0041] (4) Dip the copper grid obtained in ste...

Embodiment 2

[0047] Embodiment 2, preparation coats the oil-water separation omentum of modified chitosan / carboxymethyl cellulose mixture

[0048] (1) immerse the 300-mesh nylon net successively in ethanol and acetone and ultrasonically clean it for 5 minutes, soak it in hydrochloric acid for 1 hour, and dry it at room temperature;

[0049] (2) At normal temperature, add 100ml of water, 2ml of glacial acetic acid, and 2g of chitosan (80%-95% degree of deacetylation) into a 250ml beaker, stir and mix evenly to obtain a 2% chitosan solution.

[0050] (3) Use a 250ml beaker to configure a viscous aqueous solution of carboxymethylcellulose with a mass concentration of 5%. The chitosan solution and the carboxymethyl cellulose solution are uniformly mixed according to the mass ratio of 5:1 to obtain a mixed solution.

[0051] (4) Dip the nylon mesh obtained in step (1) into the mixed solution obtained in step (3), keep it for 30 minutes, and then take it out to dry.

[0052] (5) The net that s...

Embodiment 3

[0057] Embodiment 3, preparation coats the oil-water separation omentum of modified chitosan

[0058] (1) immerse the 300-mesh steel wire mesh successively in ethanol and acetone for ultrasonic cleaning for 5 minutes, soak in hydrochloric acid for 1 hour, and then immerse in concentrated sulfuric acid for 1 hour to form a stable hydrophilic passivation layer;

[0059] (2) At normal temperature, add 100ml of water, 2ml of glacial acetic acid, and 2g of chitosan (80%-95% degree of deacetylation) into a 250ml beaker, stir and mix evenly to obtain a 2% chitosan solution.

[0060] (3) dip the steel wire mesh that step (1) obtains in the chitosan solution that step (2) obtains, keep 30min, then take out and dry;

[0061] (4) The net obtained in step (3) is immersed in a 4% sodium hydroxide aqueous solution with a mass concentration of 4%, and kept for 1min, then taken out to dry, immersed in 2% glutaraldehyde solution at 40°C for 30min, fully cross-linked, Wash with deionized water...

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Abstract

The invention discloses an oil-water separation mesh film with an acid-base salt stabilizing function and with an underwater super-oleophobic property and a preparation method thereof. The method for preparing the oil-water separation mesh film comprises the following steps: 1) cleaning a 100-400-mesh fabric mesh, and drying; 2) impregnating the dried fabric mesh in an acidic solution of a chitosan-based polymer; 3) impregnating the fabric mesh in a base solution, so as to enable the chitosan-based polymer to be cured, drying the cured chitosan-based polymer, and cross-linking the dried cured chitosan-based polymer in a dialdehyde cross-linking agent solution, so as to obtain a cross-linked coating fabric mesh; and 4) impregnating the cross-linked fabric mesh in a base solution of a reducing agent for reducing Schiff base formed by cross-linking, washing the reduced fabric mesh by using deionized water, and drying to obtain the oil-water separation mesh film. The oil-water separation mesh film has biological affinity, is environment-friendly and easy to clean, can be repeatedly utilized and has high stability in strict acid-base salt environments.

Description

technical field [0001] The invention relates to an oil-water separation omentum which is stable to acid, alkali and salt and has underwater superoleophobic properties and a preparation method thereof. Background technique [0002] Environmental pollution is an important issue in today's world, among which, marine oil spills and industrial oily sewage discharge are important issues that need to be solved urgently. Oil-water separation technology is one of the emerging technologies to solve the above two environmental pollution problems. The composition of seawater is complex, and industrial sewage often has many properties such as strong acid and strong alkali, which puts forward strict requirements on the stability of the oil-water separation membrane. Therefore, finding biocompatible, environmentally friendly, cheap, high separation efficiency, and reusable oil-water separation membranes has become an important topic. [0003] The Chinese patent application with the appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022C02F1/40
Inventor 冯琳卢飞张诗妍陈雨宁刘娜薛众鑫孙中雪
Owner TSINGHUA UNIV
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