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Super hydrophobic-supper lipophilic polymer porous film, preparation method and application thereof

A porous membrane and super lipophilic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of inability to separate emulsified oil with small particle size, poor separation membrane strength, etc., and achieve the preparation process Simple operation, efficient separation, and controllable thickness

Active Publication Date: 2012-11-28
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current separation membrane with special wettability can only separate the slick oil with larger particle size in the oil slick wastewater system, but cannot separate the emulsified oil with smaller particle size.
At the same time, the strength of this type of separation membrane may be poor, which has also become one of the factors limiting its wide application.

Method used

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  • Super hydrophobic-supper lipophilic polymer porous film, preparation method and application thereof
  • Super hydrophobic-supper lipophilic polymer porous film, preparation method and application thereof

Examples

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preparation example Construction

[0025] The preparation method of the superhydrophobic-superoleophilic polymer porous membrane is as follows: mixing small molecular substances and polymer material solutions in a set ratio, spreading the resulting mixed solution on the surface of the substrate, and then forming a film through a wet phase inversion process .

[0026] Furthermore, it is obvious that based on the foregoing content of this specification, those skilled in the art can easily imagine that by controlling the type and concentration (or ratio) of polymer materials and small molecule additives in the mixed solution, the amount and extension of the mixed solution Area, and then prepare membranes with different strengths, thicknesses and areas to meet the needs of practical applications.

[0027] For example, as a preferred embodiment of the present invention, the concentration of the polymer material in the mixed solution may be 0.05-40wt%, and the small-molecule additive may be 0.01-70wt%.

[0028] Pref...

Embodiment 1

[0038] Weigh polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP) to prepare 1ml of 0.1g / ml solution; measure 40ul of NaOH aqueous solution (concentration: 1.5wt%) and slowly add it under the condition of magnetic stirring Add the above PVDF solution and stir until homogeneous. After scraping the above mixed solution on the surface of the pre-cleaned glass substrate, transfer it to a water bath (water bath temperature: 25±1°C) for curing. Then the membrane is taken out from the water bath and dried at room temperature to obtain the finished superhydrophobic-superoleophilic polymer porous membrane, the surface structure of which can be found in figure 2 , while its contact angle for aqueous systems is 158° (see figure 1 ).

Embodiment 2

[0040] Weigh polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP) to prepare 1ml of 0.05g / ml solution; measure 20ul of pure water, slowly add it to the above PVDF solution under magnetic stirring conditions, and stir to uniform. After casting the above mixed solution on the surface of the pre-cleaned glass substrate to form a film, transfer it to a water bath (water bath temperature: 15±1°C) for curing. Then the membrane is taken out from the water bath and dried at room temperature to obtain the finished superhydrophobic-superoleophilic polymer porous membrane.

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Abstract

The invention discloses a super hydrophobic-supper lipophilic polymer porous film, preparation method and application thereof. The surface of the polymer porous film is a micro nanometer structure, a nanometer level and / or micron / submicron level pore channel is arranged in the polymer porous film, the thickness of the film is controllable in the range of tens of nanometers to millimeters and the film is used for oil / water (including emulsified oil) separation. The preparation method comprises the following steps: adding a micromolecular additive into a macromolecular solution according to a certain proportion, spreading the obtained mixture solution on the surface of a substrate, and finally forming a film by a wet-method phase inversion technology. The oil immersion speed of the polymer porous film is quick and the film is not easily polluted, and the film has relatively high separation efficiency and flux for the oil-water mixture and the oil-water emulsion (or emulsified oil), and the film has other features such as convenient preparation technology, easy operation and low production cost. The film can be widely applied in various fields such as large-scale separation and purification of the industrial oil water (emulsified oil water) and large-scale filter and separation of organic liquid / water.

Description

technical field [0001] The invention particularly relates to a superhydrophobic-superoleophilic polymer porous membrane capable of separating oil and water (including emulsified oil and water), its preparation process and application, and belongs to the technical field of material preparation. Background technique [0002] The emulsified oil and water produced in the industrial production process has a large discharge volume, complex composition, and high COD value, which seriously endangers the water environment and human health. Therefore, it is necessary to treat the emulsified oil wastewater to remove the emulsified oil. However, traditional treatment methods such as gravity method, centrifugation method, ultrasonic method, air flotation method, coagulation method, oxidation method, etc., have low separation effect and efficiency, and the impurities after precipitation are also harmful to the corrosion and cleaning of materials. Very large impact, easy to produce second...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/06B01D61/00C02F1/44
Inventor 靳健张文彬张忠义江雷
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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