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Hydrophilic oleophobic polymer and preparation method thereof, and application thereof in humidity response oil and water separating membrane

An oil-water separation membrane, hydrophilic and oleophobic technology, used in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc. Inexpensive, easy to clean and reuse effects

Inactive Publication Date: 2014-02-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anish Tuteja from the University of Michigan reported a humidity-responsive smart film prepared by hybridization of hydrophilic polyethylene glycol diacrylate (PEGDA) and fluorinated polyorganosilsesquioxane (POSS). When the PEGDA segment reassembles under the action of hydrogen bonds to increase the contact with water, so that the surface exhibits superhydrophilicity, while it exhibits superoleophobicity in air and water. Slick oil, dispersed oil, and emulsion all have high-efficiency separation of more than 99.9%, but a large amount of fluorine-containing POSS used in the preparation process is expensive and the cost is too high

Method used

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  • Hydrophilic oleophobic polymer and preparation method thereof, and application thereof in humidity response oil and water separating membrane
  • Hydrophilic oleophobic polymer and preparation method thereof, and application thereof in humidity response oil and water separating membrane
  • Hydrophilic oleophobic polymer and preparation method thereof, and application thereof in humidity response oil and water separating membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: FPVA / SiO 2 Preparation of / GA composite stainless steel wire mesh oil-water separation mesh

[0039] (1) Put a piece of 15×15mm 2 The 300-mesh stainless steel wire mesh was immersed in distilled water, ethanol or acetone, and distilled water in order, respectively, and ultrasonically cleaned at 150W and 40KHz for 8min, and hung up to dry at room temperature;

[0040] (2) Dissolve polyvinyl alcohol (Sinopharm AH26) in hot water above 95°C, prepare a 5% solution, cool, and mix trifluoroacetic acid (Wuhan Defu Economic Development Co., Ltd.) The functional group molar ratio is 1:1, and the esterification reaction is carried out, and the fluorine-containing segment is grafted to obtain the first type of hydrophilic and oleophobic polymer.

[0041] Using Perkin‐Elmerspectrum‐2000 Fourier Transform Infrared Spectrometer to measure the structural changes during the synthesis of new hydrophilic and oleophobic polymers, the infrared spectrum is shown in figure 2 s...

Embodiment 2

[0048] Example 2: FPVA / SiO 2 Preparation of / EA copper wire mesh oil-water separation mesh

[0049] (1) Put a piece of 15×15mm 2 The 100-mesh copper wire mesh was immersed in distilled water, ethanol, and distilled water in order, respectively, cleaned at 100W and 20KHz for 10min, and hung up to dry at room temperature;

[0050] (2) Dissolve polyvinyl alcohol (Sinopec 1799) in hot water above 95°C, prepare a 5% solution, cool, and react polyvinyl alcohol with monochloroacetic carboxyethylation to convert all hydroxyl groups For the carboxyethyl group, mix perfluorotriethylamine (Wuhan Defu Economic Development Co., Ltd.) and carboxyethylated polyvinyl alcohol according to the functional group molar ratio of 1:1, carry out neutralization reaction, and graft the fluorine-containing segment, Obtain the second kind of hydrophilic and oleophobic polymer, adopt Perkin‐Elmerspectrum‐2000 Fourier Transform Infrared Spectrometer to measure the structural changes in the synthesis proc...

Embodiment 3

[0057] Example 3: FPVA / SiO 2 Preparation of / GA composite stainless steel wire mesh oil-water separation mesh

[0058] (1) Put a piece of 15×15mm 2 The 200-mesh aluminum wire mesh was immersed in distilled water, ethanol or acetone, and distilled water in order, respectively, and ultrasonically cleaned at 150W and 40KHz for 10min, and hung up to dry at room temperature;

[0059] (2) Dissolve polyvinyl alcohol in hot water above 95°C, prepare a 5% solution, cool, and react polyvinyl alcohol (Sinopec 2499) with monochloroacetic acid carboxyethylation to convert all the hydroxyl groups For the carboxyethyl group, mix perfluorotributylamine (Wuhan Defu Economic Development Co., Ltd.) and carboxyethylated polyvinyl alcohol according to the functional group molar ratio of 1:4, carry out neutralization reaction, and graft the fluorine-containing segment, Obtain the second kind of hydrophilic and oleophobic polymer, adopt Perkin‐Elmerspectrum‐2000 Fourier Transform Infrared Spectrom...

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Abstract

The invention discloses a hydrophilic oleophobic polymer and preparation method thereof, and application thereof in humidity response oil and water separating membrane. The preparation of the hydrophilic oleophobic polymer comprises the following steps: carrying out an esterification reaction of polyvinyl alcohol and perfluorocarboxylic acid or firstly carrying out a carboxylation of polyvinyl alcohol and then a neutralization reaction of the intermediate product and perfluorotertiary amine. When the product is used, a fabric silk screen is cleaned with ultrasonic sound; 10-50 parts of hydrophilic oleophobic polymer, 50-500 parts of nanometer sol, 1-5 parts of cross-linking agents and 1-5 parts of catalysts are dispersed uniformly; the mixed liquor is dip-coated or spray-coated on the surface of the membrane, and after drying and crosslinking, the humidity response super-hydrophilic and super-oleophobic oil and water separating net membrane. According to the invention, hydrophilic groups are distributed surrounding the hydrophobic chain segment on the surface of the net membrane with humidity responsiveness, and contact angle in the air of the product to water is reduced to 0 degree from more than 90 degrees, and the contact angle in air and water of the product to oil is above 150 degrees, so the product has a low adherence characteristic of droplet. The net membrane is used for separating oil and water mixture and processing oil-containing sewage.

Description

technical field [0001] The invention relates to superhydrophilic and superoleophobic coatings, in particular to a hydrophilic and oleophobic polymer and its preparation method and its application in humidity-responsive oil-water separation membranes, belonging to the technical field of special functional coatings and organic-inorganic hybrid nano functional materials . Background technique [0002] In the 21st century, human beings' awareness of environmental protection has become stronger and stronger, and the maintenance of the environment must rely on advanced science and technology. Oily sewage is an important class of environmental pollutants. It has a large amount, is difficult to deal with, and is extremely harmful. Oily sewage comes from a wide range of sources. All water that comes into contact with humans contains oil. Oil is divided into polar oil and non-polar oil. Polar oil comes from animals and is biodegradable; non-polar oil comes from petroleum and other m...

Claims

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Application Information

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IPC IPC(8): C08F16/06C08F8/18C08F8/32C09D129/04C09D5/00C09D7/12B01D69/02B01D71/38C02F1/44
Inventor 涂伟萍袁腾王锋周显宏
Owner SOUTH CHINA UNIV OF TECH
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