Asymmetric ultra-hydrophilic/hydrophobic dual-property polymer membrane and preparation method thereof

A polymer membrane, asymmetric technology, applied in the field of membrane separation, can solve problems such as impermeability of water droplets, achieve the effect of improving water permeability, reducing direct contact sites and adhesion properties, and improving anti-pollution properties

Active Publication Date: 2017-01-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, regarding the water droplet permeability of the superhydrophilic side of the polymer membrane, although the water droplet easily spreads on the surface and penetrates into the membrane when it contacts the superhydrophilic side of the polymer membrane, as the water droplet penetrates into the membrane and When gradually reaching the superhydrophobic side of the asymmetric amphoteric polymer membrane, according to the principle of the Laplace equation, due to the difference in interfacial tension between the hydrophilic and hydrophobic sides of the polymer membrane, it is affected by the radius of curvature of the water droplet and the superhydrophobic repulsion. This in turn makes it difficult for water droplets to permeate from the superhydrophilic side of the asymmetric amphiphile membrane and pass through its superhydrophobic side.

Method used

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  • Asymmetric ultra-hydrophilic/hydrophobic dual-property polymer membrane and preparation method thereof
  • Asymmetric ultra-hydrophilic/hydrophobic dual-property polymer membrane and preparation method thereof
  • Asymmetric ultra-hydrophilic/hydrophobic dual-property polymer membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The super-hydrophilic polysulfone hollow fiber gradient membrane (Nanjing Jialejing Membrane Technology Co., Ltd., PS6040) with an average pore size of 0.9 μm, a porosity of 60%, and a film thickness of 200 μm (that is, an inner diameter of 400 μm and an outer diameter of 600 μm) was used as Polymer base film, the modified liquid used is 10wt% glycerol / water mixed solution of fluorine-containing polyurethane copolymer, the mixed volume ratio is 1:15 (v / v), and the surface is hydrophobized by dip coating Modification, wherein the immersion time is controlled at 10min, and its various properties are measured after drying.

[0036] The water contact angle of the superhydrophilic side of the prepared superphilic / hydrophobic amphipathic polymer membrane is 15°, and the water contact angle of the superhydrophobic side is 125°; the water flux on the superhydrophobic side is greater than 10540L / m 2 h 0.1MPa; the water flux on the reverse super-hydrophilic side is less than 6800...

Embodiment 2

[0038] A hydrophilic polysulfone hollow fiber gradient membrane (Nanjing Jialejing Membrane Technology Co., Ltd., PS4530) with an average pore size of 0.5 μm, a porosity of 60%, and a film thickness of 150 μm (that is, an inner diameter of 300 μm and an outer diameter of 450 μm) was used for polymerization The material-based film, the modified liquid used is 12wt% glycerin / water mixed solution of fluorine-containing acrylate copolymer, the mixed volume ratio is 1:20 (v / v), and the surface is hydrophobicized by suction filtration and adsorption. Modification, wherein the suction filtration time is controlled at 60s, and its various properties are measured after drying.

[0039] The water contact angle on the hydrophilic side of the prepared superphilic / hydrophobic amphoteric polymer membrane is 15°, and the water contact angle on the hydrophobic side is 132°; the water flux on the superhydrophobic side is greater than 10080L / m 2 h 0.1MPa; the water flux on the reverse super-hyd...

Embodiment 3

[0041] The super-hydrophilic polyethersulfone flat membrane with an average pore diameter of 0.25 μm, a porosity of 40%, and a film thickness of 300 μm is used as the polymer base membrane, and the modified liquid used is 25 wt% polydimethylsiloxane Methanol / ether mixed solution, the mixing volume ratio is 1:3 (v / v), and its surface is modified by surface transfer printing. The transfer template uses a 60-mesh nylon mesh, which is measured after roller drying. Various properties.

[0042] The prepared superphilic / hydrophobic amphoteric polymer membrane has a water contact angle of 30° on the hydrophilic side and a water contact angle of 120° on the hydrophobic side; the water flux on the superhydrophobic side is greater than 8415L / m 2 h 0.1MPa; the water flux on the reverse super-hydrophilic side is less than 5100L / m 2 ·h·0.1MPa, the water flux on the forward super-hydrophobic side is 65% higher than that on the reverse super-hydrophilic side, and the cleaning water flux reco...

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Abstract

The invention relates to a membrane separation technique and aims at providing an asymmetric ultra-hydrophilic / hydrophobic dual-property polymer membrane and a preparation method thereof. According to the asymmetric ultra-hydrophilic / hydrophobic dual-property polymer membrane, a base membrane is a flat sheet membrane or a hollow fiber membrane, one side of the base membrane is a hydrophilic side, the water contact angle of the hydrophilic side is not greater than 30 degrees, the other side of the base membrane is a hydrophobic side, and the water contact angle of the hydrophobic side is not smaller than 120 degrees. The prepared asymmetric ultra-hydrophilic / hydrophobic dual-property polymer membrane is of the type of the flat sheet membrane or the hollow fiber membrane and belongs to an ultra-micro filter membrane category, and the pore diameter range of the membrane is 0.01-2.0 microns. Therefore, the hydrophilic and hydrophobic properties on double sides are different, one side is hydrophilic, the other side is hydrophobic, and the asymmetric ultra-hydrophilic / hydrophobic dual-property polymer membrane shows asymmetric hydrophilic / hydrophobic properties and is a novel water treatment membrane.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to an asymmetric superphilic / hydrophobic amphoteric polymer membrane and a preparation method thereof. Background technique [0002] With the continuous development of social industrialization, industries such as textile industry, paper industry and oil refining industry continue to produce a large amount of harmful industrial wastewater in their production activities. For these industrial wastewaters, the effective means of treatment is the comprehensive utilization of membrane separation technology. However, the current membrane separation technology will inevitably encounter serious membrane fouling problems in the actual application process, which greatly reduces the membrane separation efficiency and membrane service life, thereby increasing the operating energy consumption and production costs. Therefore, how to improve the anti-fouling performance of the membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D69/08B01D69/02B01D67/00B01D71/34B01D71/68B01D71/16B01D71/64B01D71/50B01D71/42B01D71/36B01D71/26B01D71/38
CPCB01D67/0081B01D67/0093B01D69/02B01D69/06B01D69/08B01D71/16B01D71/26B01D71/34B01D71/36B01D71/38B01D71/42B01D71/50B01D71/64B01D71/68B01D2325/36B01D2325/38
Inventor 黄小军李晶朱薛妍洪晓
Owner ZHEJIANG UNIV
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