Method for preparing superhydrophobic composite microporous membrane

A microporous membrane and super-hydrophobic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as changing the overall performance of polymers, improve hydrophobic performance, increase contact angle, and reduce freedom. energy effect

Active Publication Date: 2017-04-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there have been many reports on carbon nanotube/polymer composite films, most of which are prepared by adding carbon nanotubes to polymer solutions and blending to prepare com

Method used

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  • Method for preparing superhydrophobic composite microporous membrane
  • Method for preparing superhydrophobic composite microporous membrane
  • Method for preparing superhydrophobic composite microporous membrane

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] The configuration quality composition is respectively polyvinylidene fluoride (PVDF)-10%, N,N-dimethylacetamide (DMAc)-84%, n-octanol (1-Octanol)-6% casting solution is placed in 70 In a vacuum drying oven at ℃, the casting solution is completely dissolved and mixed evenly, then the temperature is adjusted to 35 ℃ and left to defoam for 2 days, and the casting solution is evenly scraped on the aluminum alloy plate chemically etched for 8 hours with a scraper. Form a liquid film with a thickness of 0.15 μm-0.2 μm on the plate, place the liquid film in a constant temperature and humidity chamber with a relative humidity of 95% to induce water vapor for 5 minutes, and then immerse the liquid film in a pure water coagulation bath at 35°C for phase separation After 0.5h, the liquid film is solidified into a solid film, removed from the aluminum alloy plate, soaked in deionized water for 2 days, then immersed in ethanol for 1 day, taken out the solid film and dried at room tem...

Embodiment 2

[0029]The configuration quality composition is respectively polyvinylidene fluoride (PVDF)-10%, N,N-dimethylacetamide (DMAc)-84%, n-octanol (1-Octanol)-6% casting solution is placed in 70 In a vacuum drying oven at ℃, the casting solution is completely dissolved and mixed evenly, then the temperature is adjusted to 35 ℃ and left to defoam for 2 days, and the casting solution is evenly scraped on the aluminum alloy plate chemically etched for 8 hours with a scraper. Form a liquid film with a thickness of 0.15 μm-0.2 μm on the plate, place the liquid film in a constant temperature and humidity chamber with a relative humidity of 95% to induce water vapor for 5 minutes, and then immerse the liquid film in a pure water coagulation bath at 35°C for phase separation After 0.5h, the liquid film is solidified into a solid film, removed from the aluminum alloy plate, soaked in deionized water for 2 days, then immersed in ethanol for 1 day, taken out the solid film and dried at room temp...

Embodiment 3

[0034] The configuration quality composition is respectively polyvinylidene fluoride (PVDF)-10%, N,N-dimethylacetamide (DMAc)-84%, n-octanol (1-Octanol)-6% casting solution is placed in 70 In a vacuum drying oven at ℃, the casting solution is completely dissolved and mixed evenly, then the temperature is adjusted to 35 ℃ and left to defoam for 2 days, and the casting solution is evenly scraped on the aluminum alloy plate chemically etched for 8 hours with a scraper. Form a liquid film with a thickness of 0.15 μm-0.2 μm on the plate, place the liquid film in a constant temperature and humidity chamber with a relative humidity of 95% to induce water vapor for 5 minutes, and then immerse the liquid film in a pure water coagulation bath at 35°C for phase separation After 0.5h, the liquid film is solidified into a solid film, removed from the aluminum alloy plate, soaked in deionized water for 2 days, then immersed in ethanol for 1 day, taken out the solid film and dried at room tem...

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Abstract

The invention relates to a method for preparing a superhydrophobic composite microporous membrane. The method comprises the following steps: firstly, preparing a polyvinylidene fluoride (PVDF) high-hydrophobic microporous membrane as a basal membrane by a coarse substrate assisted phase inversion method, then, preparing a multi-walled carbon nanotube (MWCNTs) uniform dispersion solution, filtering the MWCNTs dispersion solution with the prepared PVDF basal membrane at constant pressure by adopting a constant-pressure filtering method so as to prepare a PVDF/MWCNTs composite membrane, and carrying out coating with an n-hexane solution of polydimethylsiloxane (PDMS), thereby preparing the PVDF/MWCNTs/PDMS superhydrophobic composite microporous membrane. According to the composite microporous membrane obtained by the method, the static water contact angle can reach 162 degrees, the angle of roll is 10 to 20 degrees, the nitrogen gas flux at the pressure of 100kPa is greater than 0.3m<3>/(m<2>.s), the tensile strength is higher than 2.6MPa, and the elongation at break is higher than 96%, so that the superhydrophobic composite microporous membrane can be applied to membrane contact procedures such as membrane distillation and membrane absorption.

Description

technical field [0001] The invention relates to a method for preparing a super-hydrophobic composite microporous membrane, specifically a method for preparing a PVDF / MWCNTs composite membrane by filtering a uniform dispersion of multi-walled carbon nanotubes with a PVDF base membrane under constant pressure conditions, and then passing polydimethylformaldehyde A method for preparing PVDF / MWCNTs / PDMS superhydrophobic composite microporous membrane by coating with n-hexane solution of base siloxane (PDMS). Background technique [0002] In recent years, superhydrophobic surfaces (surfaces with a contact angle with water greater than 150°) have received much attention. Studies have shown that the construction of superhydrophobic surfaces can start from two aspects: increasing surface roughness and reducing surface energy. Polyvinylidene fluoride (PVDF) is widely used in the preparation of separation membranes due to its excellent physical and chemical properties. However, PVDF ...

Claims

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Application Information

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IPC IPC(8): B01D71/70B01D69/02B01D67/00
Inventor 王志英于泳波韩承志杨振生张辉
Owner HEBEI UNIV OF TECH
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