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Membrane preparation method combining construction of nanoparticles and membrane surface microstructure

A microstructure and nanoparticle technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as poor hydrophobicity, poor oleophobicity, and insufficient durability, and achieve strong durability, excellent anti-pollution and anti-moisture The effect of wet performance

Active Publication Date: 2021-07-27
NORTHEAST DIANLI UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of membrane fouling caused by poor hydrophobicity, poor oleophobicity, and insufficient durability in the existing membrane distillation technology, and to provide a membrane preparation method that combines nanoparticle and membrane surface microstructure construction

Method used

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  • Membrane preparation method combining construction of nanoparticles and membrane surface microstructure
  • Membrane preparation method combining construction of nanoparticles and membrane surface microstructure

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specific Embodiment approach 1

[0029] Specific Embodiment 1: In this embodiment, a membrane preparation method combining nanoparticles and membrane surface microstructure construction is prepared according to the following steps:

[0030] 1. Mix polyvinylidene fluoride, diethylene glycol, and dimethylacetamide evenly, and then stir and react to obtain a PVDF base film casting solution;

[0031] 2. First, pour the PVDF base film casting solution evenly onto the silicon wafer template with a regular cylindrical concave array on the surface and use a scraper to control the thickness and smoothness of the casting solution, then expose it in a steam bath, and then immerse it in the coagulation bath In the process, a film is formed on the silicon wafer template, and finally the film is separated from the silicon wafer template; the film is washed with distilled water and absolute ethanol in sequence, and then dried to obtain a film for membrane distillation with a regular cylindrical concave array on the surface; ...

specific Embodiment approach 2

[0037]Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass ratio of polyvinylidene fluoride, diethylene glycol and dimethylacetamide described in step one is 15:(25~27.4):( 57.6~60). Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0038] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the temperature of the stirring reaction in step 1 is 80°C-90°C, and the time of stirring reaction is 8h-12h. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a membrane preparation method combining construction of nanoparticles and a membrane surface microstructure, belonging to a preparation method of a surface microstructure membrane. The invention aims to solve the problem of membrane pollution caused by poor hydrophobicity, poor oleophobicity and insufficient durability in existing membrane distillation technology. The membrane preparation method comprises the following steps: 1, preparing a PVDF base membrane casting solution; 2, preparing a membrane for membrane distillation, wherein the surface of the membrane is provided with a regular cylindrical concave array; 3, loading silicon dioxide nanoparticles; and 4, reducing surface energy to form a membrane formed by combined construction of the nanoparticles and the membrane surface microstructure. The maximum values of static contact angles of the membrane, formed by combined construction of the nanoparticles and the membrane surface microstructure, with water and diiodomethane are 170 degrees and 157 degrees respectively, and a super-amphiphobic level is achieved, so the membrane has excellent anti-pollution performance. The invention provides the method for preparing the membrane by combining the nanoparticles with the membranemembrane surface microstructure.

Description

technical field [0001] The invention relates to a method for preparing a surface microstructure film. Background technique [0002] As a new type of membrane separation technology, membrane distillation technology has the advantages of low cost, simple equipment, easy operation and low energy consumption in seawater desalination and high-salt wastewater treatment. Since membrane fouling will change the properties of the membrane surface and membrane pore structure, resulting in a decrease in membrane flux and contamination of the permeate, conventional hydrophobic membranes such as PTFE (polytetrafluoroethylene) membranes, PP (polypropylene) membranes and PVDF (polypropylene) membranes Vinylidene fluoride) has been unable to meet the wide application of membrane technology in the industrial field. [0003] At present, the methods of membrane distillation pollution prevention and control mainly focus on the pretreatment of the feed liquid, the addition of scale inhibitors, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34B01D61/36C02F1/04C02F1/44C02F103/08
CPCB01D67/0079B01D69/02B01D71/34B01D61/364C02F1/447C02F1/04B01D2323/04B01D2325/38C02F2103/08
Inventor 李正牟航葵毕嘉楠牛静东何广泽张兰河张海丰
Owner NORTHEAST DIANLI UNIVERSITY
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