Hydrophilic-underwater oleophobic polymer porous membrane, preparation method and applications thereof

A polymer and porous membrane technology, applied in the field of materials, can solve the problems of inability to separate emulsified oil, poor strength of separation membrane, etc., and achieve the effects of simple and easy preparation process, efficient separation, high separation efficiency and flux

Active Publication Date: 2015-02-25
SUZHOU BINARY CENTURY NANO TECH +1
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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 floating oil with a large particle size (generally greater than 20 microns) in the oil floating wastewater system, but cannot separate the emulsified oil with a small particle size
At the same time, the strength of this type of separation membrane is also poor, which has become one of the factors limiting its wide application.

Method used

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  • Hydrophilic-underwater oleophobic polymer porous membrane, preparation method and applications thereof
  • Hydrophilic-underwater oleophobic polymer porous membrane, preparation method and applications thereof
  • Hydrophilic-underwater oleophobic polymer porous membrane, preparation method and applications thereof

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preparation example Construction

[0026] The preparation method of the hydrophilic-underwater oleophobic polymer porous membrane of the present invention comprises:

[0027] Dissolving polymer materials in organic solvents to prepare polymer solutions;

[0028] Transferring the polymer solution to the surface of the substrate for spreading or direct spinning;

[0029] A hydrophilic-hydrophobic polymer porous membrane was obtained through phase inversion induced by salts.

[0030] Further, it is obvious that based on the foregoing contents of this specification, those skilled in the art can easily think of preparing Membranes of different strengths, thicknesses and areas to meet the needs of practical applications.

[0031] For example, as a preferred embodiment of the present invention, the concentration of the polymer material in the mixed solution can be 0.05-40% by weight, and the polymer material grafted with hydrophilic functional groups includes polyacrylic acid and its derivatives, poly-N-ethyl ethyl ...

Embodiment 1

[0041] Weigh polyvinylidene fluoride (PVDF, grafted polyacrylic acid, graft rate 7.1% by weight) and dissolve it in N-methylpyrrolidone (NMP), prepare 10ml of 0.05g / ml solution, and stir until uniform. Accurately weigh sodium acetate and dissolve it in pure water to prepare a 15% by weight coagulation bath. After the obtained polymer solution is scraped on the surface of the pre-cleaned glass substrate, it is transferred to a coagulation bath for phase inversion. Then the membrane is taken out from the coagulation bath and dried at room temperature to obtain a hydrophilic-hydrophobic polymer porous membrane, and its surface structure can be found in Figure 4 , with a contact angle of 0° for water (see figure 2 ), the underwater oil (dichloroethane) contact angle is 150° (see image 3 ).

Embodiment 2

[0043] Weigh polyethersulfone (PES, grafted sodium polysulfonate, grafting rate 8.0% by weight) and dissolve it in dimethylacetamide (DMAc) to prepare 200ml of 0.17g / ml solution, stir evenly and ultrasonically defoam. Accurately weigh potassium nitrate and dissolve it in water to prepare a 10% by weight coagulation bath. The obtained polymer solution is transferred to the reaction kettle of the small hollow fiber spinning machine, and the polymer solution is extruded through the spinneret and directly enters the coagulation bath for phase inversion. Then the membrane was taken out from the water bath, and dried in an oven at 60°C to obtain a hydrophilic-hydrophobic polymer porous membrane.

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Abstract

The invention discloses a hydrophilic-underwater oleophobic polymer porous membrane, a preparation method and applications thereof. The hydrophilic-underwater oleophobic polymer porous membrane is a polymer matrix membrane. The membrane surface has a coarse micro-nano level porous structure. Nano level, micrometer level and/or sub-micrometer level tunnels are distributed in the membrane. The static contact angle between the membrane and water is less than 10 degrees, and the underwater static contact angle between the membrane and oil is greater than 130 degrees. The provided membrane can be used to separate and purify oil-water mixture and emulsified oil-water generated by chemical engineering production, daily life, crude oil leakage accidents, and the like, and has a very important application value and wide application range.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a hydrophilic-hydrophobic polymer porous membrane, its preparation method and application. Background technique [0002] Many industries and enterprises, such as leather, petrochemical, smelting, food processing, etc., will produce a large amount of emulsified oil wastewater (a large proportion is oil-in-water emulsified wastewater) in the production process. This type of wastewater has complex components and high COD value, which seriously endangers water bodies. The environment and human health, so the emulsified oil wastewater must be separated and purified to meet the discharge standards. However, traditional treatment methods such as centrifugal method, ultrasonic method, air flotation method, coagulation method, oxidation method, etc. have low separation effect and efficiency, and may cause secondary pollution. Membrane separation technology has low energy consumption, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00C02F1/44C02F1/40
Inventor 靳健张文彬张忠义江雷
Owner SUZHOU BINARY CENTURY NANO TECH
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