Method for preparing high-hydrophobicity microporous membrane

A microporous membrane and hydrophobic technology, which is applied in the field of highly hydrophobic microporous membrane and its preparation, can solve the problems of inapplicability and narrow scope of application of diffusion-induced phase separation, and achieve narrow pore size distribution range, excellent mechanical properties, and wide variety Effect

Inactive Publication Date: 2013-09-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] All the above methods can be attributed to the diffusion-induced phase separation method, which has a relatively narrow scope of application and is only suitable for polymer materials that are soluble at room temperature, such as PVDF, polysulfone, polyacrylonitrile, etc.
For materials that are insoluble at room temperature, such as polyethylene, isotactic polypropylene, polychlorotrifluoroethylene, ethylene-chlorotrifluoroethylene copolymer, etc., the diffusion-induced phase separation method is not applicable.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Preparation of solid formwork:

[0056] Compressed air with a gauge pressure of 0.5MPa carries 320 mesh quartz sand at high speed and sprays it on the surface of an aluminum plate with a geometric size of 300mm×200mm×4mm (thickness is 4mm). The treatment time is about 2min. Solid template. It is called a 320-mesh sandblasted aluminum plate, and its microstructure is randomly distributed crown-shaped pits, with a diameter of about 43 μm, a depth of about 8 μm, and a pit area fraction of about 0.57.

[0057] Membrane method:

[0058] 1) Take 30g of polypropylene resin with brand name T30S, and take 120g of mixed diluent (dibutyl phthalate (DBP) / dioctyl phthalate (DOP), where DBP accounts for 30wt% of the mixed diluent) , and put them into a 500ml three-necked bottle, under nitrogen protection and continuous stirring at 190°C for 2 hours, then keep it standing for 2 hours for defoaming to form a casting solution.

[0059] 2) At room temperature, coat the casting solutio...

Embodiment 2

[0066] Preparation of solid formwork:

[0067] Using the HUST-UV multifunctional laser fine etching equipment, input the grating vector diagram with a grating constant of λ=46μm, etch an aluminum plate with a geometric size of 300mm×200mm×1.5mm, and obtain the grating constant λ=46μm and the peak height of the grating h= 20 μm solid template. It is called a 46μm grating aluminum plate, and the pit area fraction is about 0.50.

[0068] Membrane method:

[0069] 1) Take 30g of polypropylene resin with brand name T30S, and take 120g of mixed diluent (dibutyl phthalate (DBP) / dioctyl phthalate (DOP), where DBP accounts for 30wt% of the mixed diluent) , and put them into a 500ml three-necked bottle, under nitrogen protection and continuous stirring at 190°C for 2 hours, then keep it standing for 2 hours for defoaming to form a casting solution.

[0070] 2) At room temperature, coat the casting solution on a 46 μm grating aluminum plate at a constant temperature of 180°C. The thic...

Embodiment 3

[0077] 1) Take 30g of polypropylene resin with brand name T30S, and take 120g of mixed diluent (dibutyl phthalate (DBP) / dioctyl phthalate (DOP), where DBP accounts for 30wt% of the mixed diluent) , and put them into a 500ml three-necked bottle, under nitrogen protection and continuous stirring at 190°C for 2 hours, then keep it standing for 2 hours for defoaming to form a casting solution.

[0078] 2) At room temperature, coat the casting solution on a 46 μm grating aluminum plate at a constant temperature of 180°C. The thickness of the film solution is about 200 μm. After staying for 30 seconds, immerse the film solution and the aluminum plate in a tap water bath at 40°C to cool for 30 minutes. After liquid-liquid phase separation and polymer crystallization, the membrane liquid gel solidifies and transforms into a nascent membrane.

[0079] 3) The primary membrane was peeled off from the solid template. At room temperature, the prepared primary membrane was first soaked in e...

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Abstract

The invention relates to a method for preparing a high-hydrophobicity microporous membrane. A polymer and a membrane-making diluent membrane liquid are uniformly mixed and then are coated on a solid template on the surface of a micro structure by virtue of a thermally induced phase separation method under assistance of a solid template; the microporous membrane is prepared by the thermally induced phase separation method; and under the synergistic effect of the template and phase separation, the hydrophobicity of the membrane surface and other membrane properties are improved. The microporous membrane is high in hydrophobicity; a water contact angle is up to 165 degrees at most, and a rolling angle is 3 degrees, so that the ultra-high hydrophobicity is reflected; the permeation performance is high; the nitrogen flux under the 0.1MPa membrane penetration pressure difference is more than or equal to 260 m<3>/(m<2>.h); an aperture distribution range is small; the maximum aperture is less than or equal to 0.5 microns; the mechanical performance is high; the tensile strength is more than or equal to 3.0 MPa; and the breakage elongation is more than or equal to 68 percent.

Description

technical field [0001] The invention relates to a highly hydrophobic microporous membrane and its preparation technology, specifically refers to the preparation of a polymer microporous membrane with stable hydrophobic performance, large permeation flux, narrow pore size distribution, and excellent mechanical properties. The main application fields of the membrane are Oil / water separation, membrane distillation, membrane absorption, membrane desorption and other processes. Background technique [0002] Membrane separation technology is a new and efficient separation technology. In recent years, highly hydrophobic microporous membranes have received more attention. In the field of oil / water separation, hydrophobic microporous membranes are used, which are characterized by oil permeation and water retention, but when the hydrophobicity of the membrane is insufficient, the phase separation between oil and water will not be effective, and water will be entrained by oil Through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D71/26B01D71/32B01D71/34B01D67/00
Inventor 杨振生倪志华王志英
Owner HEBEI UNIV OF TECH
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