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Super-hydrophobic porous membrane for oil-water separation and preparation method and application thereof

A technology of porous membrane and super-hydrophobic surface, which is applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve problems such as poor mechanical properties and surface shedding of stainless steel mesh, and achieve good stability, easy cleaning, equipment and production The effect of simple process

Inactive Publication Date: 2016-08-17
BEIJING NATURE STONE SCI TECH DEVP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. patent application US2015203371A1 discloses that low-density polyethylene (LDPE)-coated stainless steel composite mesh has the function of oil-water separation, but this method is limited by the poor mechanical properties of this composite mesh, that is, the coated LDPE is easy on the surface of stainless steel mesh Therefore, it is still urgent to develop a stable method for harsh conditions (concentrated acid, concentrated alkali, high salt)

Method used

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  • Super-hydrophobic porous membrane for oil-water separation and preparation method and application thereof
  • Super-hydrophobic porous membrane for oil-water separation and preparation method and application thereof
  • Super-hydrophobic porous membrane for oil-water separation and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0049] Use 200# sandpaper to polish the surface of a 0.5 mm thick, clean, clean low-density polyethylene sheet, and place the polished polyethylene sheet in an ethanol solution for ultrasonic cleaning to obtain a super-hydrophobic low-density polyethylene sheet; The polyethylene sheet and the stainless steel needle were placed in the x-y-z control system of the dispenser (Nordson EFD-PicoDot, USA), and the stainless steel needle was placed on the superhydrophobic low-density polyethylene sheet by the dispenser. Arrayed holes are constructed on a polyethylene sheet with a porous array structure, and the spacing between adjacent holes in the porous array structure is 300 microns, and the diameter of the holes is 150 microns; then the obtained porous membrane is removed to obtain a pair of water droplets A superhydrophobic porous membrane used for oil-water separation in harsh environments (concentrated acid, concentrated alkali, high salt) with a contact angle of more than 150° a...

Embodiment 2

[0052] Use 200# sandpaper to polish the surface of a 0.5 mm thick, clean, clean low-density polyethylene sheet, and place the polished polyethylene sheet in an ethanol solution for ultrasonic cleaning to obtain a super-hydrophobic low-density polyethylene sheet; The polyethylene sheet and the stainless steel needle are placed in the x-y-z control system of the glue dispenser (Nordson EFD-PicoDot, USA), and the stainless steel needle is placed on the superhydrophobic low density polyethylene sheet by the glue dispenser. Arrayed holes are constructed on a polyethylene sheet with a porous array structure, and the spacing between adjacent holes in the porous array structure is 300 microns, and the diameter of the holes is 150 microns; then the obtained porous membrane is removed to obtain a pair of water droplets A superhydrophobic porous membrane used for oil-water separation in harsh environments (concentrated acid, concentrated alkali, high salt) with a contact angle of more tha...

Embodiment 3

[0055] Use 200# sandpaper to polish the surface of a 0.5 mm thick, clean, clean low-density polyethylene sheet, and place the polished polyethylene sheet in an ethanol solution for ultrasonic cleaning to obtain a super-hydrophobic low-density polyethylene sheet; The polyethylene sheet and the stainless steel needle are placed in the x-y-z control system of the glue dispenser (Nordson EFD-PicoDot, USA), and the stainless steel needle is placed on the superhydrophobic low density polyethylene sheet by the glue dispenser. Arrayed holes are constructed on a polyethylene sheet with a porous array structure, and the spacing between adjacent holes in the porous array structure is 300 microns, and the diameter of the holes is 150 microns; then the obtained porous membrane is removed to obtain a pair of water droplets A superhydrophobic porous membrane used for oil-water separation in harsh environments (concentrated acid, concentrated alkali, high salt) with a contact angle of more tha...

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Abstract

The invention belongs to the technical field of functional materials, and particularly relates to a super-hydrophobic porous membrane for oil-water separation in a severe environment and a preparation method and application thereof. The preparation method comprises the steps that firstly, the surface of a clean low-density polyethylene sheet is sanded with abrasive paper to obtain a super-hydrophobic low-density polyethylene sheet; secondly, the polyethylene sheet is fixed, arrayed punching is conducted on the polyethylene sheet with stainless steel needles, and then the super-hydrophobic porous membrane for oil-water separation in the concentrated-acid, concentrated-alkaline and high-salinity environment can be obtained. The contact angle of the super-hydrophobic surface to water is 150 degrees or above, the contact angle of the super-hydrophobic surface to oil is 10 degrees or below, and the pore size and the space distance in the porous array structure are both in a hundred-micron scale. The porous membrane can be used for oil-water separation in the environment containing concentrated acid, concentrated alkaline and high salinity and is good in material stability, easy to clean, capable of being reused, free of toxic and harmful substances and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a preparation method and application of a superhydrophobic porous membrane used for oil-water separation in harsh environments (concentrated acid, concentrated alkali, high salt). Background technique [0002] The chemical industry, especially the petrochemical industry, uses a large amount of concentrated acid, concentrated alkali and high salt solution. The use of these solutions has greatly promoted the development of the chemical industry on the one hand, but on the other hand it is very easy to cause problems such as corrosion of equipment, difficulty in product purification, and environmental pollution. Therefore, the rapid and efficient separation of oil-water mixtures containing concentrated acid, concentrated alkali and high salt has very broad industrial prospects. [0003] Chinese invention patent applications CN1387932A, CN103893999A and CN103657156A res...

Claims

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Application Information

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IPC IPC(8): B01D17/02B01D17/022
CPCB01D17/02B01D17/085
Inventor 于存明张冬梅李衎江雷
Owner BEIJING NATURE STONE SCI TECH DEVP