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Preparation method of novel super-hydrophilic oleophobic film

A technology of super-hydrophilic and oleophobic membranes, applied in separation methods, chemical instruments and methods, grease/oily substances/suspton removal devices, etc., can solve the problems of poor hydraulic stability of cellulose, low concentration of cellulose solution, entanglement Low level problems, to achieve the effect of improving hydraulic stability, improving hydrophilicity, and strong anti-pollution ability

Inactive Publication Date: 2021-06-25
CNOOC ENERGY SAVING & ENVIRONMENTAL PROTECTION SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, the concentration of cellulose solution is low, the degree of entanglement between cellulose molecular chains is low, and the cellulose on the surface of the separation membrane has poor hydraulic stability and is easily washed away by water.

Method used

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Examples

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Effect test

preparation example Construction

[0035] A method for preparing a novel superhydrophilic and oleophobic membrane, characterized in that it comprises the following steps: preparing a cellulose solution; coating the cellulose solution on the surface of a porous material; oxidizing the ortho hydroxyl of the cellulose to an aldehyde group by an oxidizing agent; The cross-linking agent cross-links the cellulose to form a super-hydrophilic and oleophobic film; the hydrophilic modifier is used to graft the surface of the film to further improve the hydrophilicity of the film.

[0036] More preferably, the step of preparing the cellulose solution comprises: dissolving the cellulose in NMMO·H 2 O, heating and stirring for a certain period of time to obtain a uniform mixed solution; the step of coating the cellulose solution on the surface of the porous material includes: coating the cellulose solution on the surface of the porous material and inside the pores, soaking the coated porous material In deionized water, the ...

Embodiment 1

[0046] 18g cellulose (average degree of polymerization ≈ 1000), add 382g NMMO·H 2 In O, stir at 95°C under nitrogen protection for 24 hrs to completely dissolve, and vacuum defoam to obtain a cellulose solution. Polyester non-woven fabric (thickness 5 mm, pore size range 5-10 μm) was used as porous material, the non-woven fabric was soaked in cellulose solution, soaked for 60 min, taken out, dried and soaked in deionized water to replace the solvent to obtain a separation membrane.

[0047] Soak the separation membrane in sodium periodate solution, 20g of sodium periodate, 180g of deionized water, react at 80°C for 10h, take it out and rinse it with deionized water to obtain an aldylation separation membrane. Soak the aldylation separation membrane in the cross-linking agent solution, the cross-linking agent solution includes polyethyleneimine (molecular weight 1700) 20g, deionized water 180g, react at 50°C for 24h, take it out and rinse it with deionized water to obtain the c...

Embodiment 2

[0051] 36g cellulose (average degree of polymerization ≈ 1000), add 364g NMMO·H 2 In O, stir at 100°C under nitrogen protection for 24 hrs to completely dissolve, and vacuum defoam to obtain a cellulose solution. A polypropylene microporous membrane (thickness 0.5 mm, pore diameter range 5 μm) was used as the porous material, and the microporous membrane was soaked in cellulose solution for 240 min, then taken out, dried and soaked in deionized water to replace the solvent to obtain a separation membrane.

[0052] Soak the separation membrane in potassium permanganate solution, 10g of potassium permanganate, 190g of deionized water, react at 60°C for 24h, take it out and rinse it with deionized water to obtain an aldylation separation membrane. Soak the aldylation separation membrane in the cross-linking agent solution, the cross-linking agent solution includes 30g of chitosan, 170g of deionized water, add 5g of glacial acetic acid, react at 50°C for 24h, take it out and rinse...

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PUM

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Abstract

The invention relates to a preparation method of a novel super-hydrophilic oleophobic membrane, which comprises the following steps: directly dissolving cellulose by using N-methylmorpholine-N-oxide monohydrate (NMMO.H2O) as a solvent to prepare a coating solution, and coating the surface of a porous material with the coating solution. The preparation method comprises the following steps: oxidizing ortho-hydroxyl of cellulose into an aldehyde group by using an oxidizing agent, carrying out chemical crosslinking on the cellulose on the surface of a porous material by using a crosslinking agent to improve the stability of the cellulose, and further grafting a hydrophilic monomer on the surface of a cellulose membrane to prepare the super-hydrophilic oleophobic membrane. The preparation process is simple and environment-friendly, the oil-water separation efficiency is high, the anti-pollution capacity is high, and the good industrial application value is achieved.

Description

technical field [0001] The invention relates to the technical field of superhydrophilic and oleophobic membranes, in particular to a preparation method of a novel superhydrophilic and oleophobic membrane. Background technique [0002] Oily sewage widely exists in the fields of petroleum extraction, transportation, storage, smelting and fine chemical industry, metal processing, coal chemical industry and so on. Every year, 5 to 10 million tons of oil flow into the ocean through various channels in the world. Due to the high chemical oxygen demand (COD) of oily sewage, the treatment is difficult, and the degradability of pollutants is poor. No matter in terms of environmental governance, oil recovery and water reuse, higher requirements are put forward for oil-water separation. [0003] Oil and water are immiscible systems, and water exists in the form of oil droplets or water droplets in oil or oil in water. Oil and water have different densities. Most oils are less dense t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022C02F1/40
CPCB01D17/0202C02F1/40
Inventor 刘铭辉王新乐王妮付晓燕曹兴涛王国柱王维兵闫肃
Owner CNOOC ENERGY SAVING & ENVIRONMENTAL PROTECTION SERVICES
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