Superhydrophobic oleophobic modification method of porous membrane

A super-hydrophobic and oleophobic, porous membrane technology, applied in the field of separation membranes, can solve the problems of weak super-amphiphobic surface, weak adhesion, weak friction and washing resistance, etc. Hydrophilization, good hydrophobicity, good stability and good abrasion resistance

Active Publication Date: 2017-02-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process requires high vacuum and ultraviolet radiation, and the cost is high
[0011] Although in recent years, there have been many reports on the use of fluoropolymers to construct super-amphiphobic surfaces, but most of the fluoropolymers reported in the literature have weak adhesion between the surface of the substrate, which leads to the construction of super-amphiphobic surfaces. The hydrophobic surface has disadvantages such as instability, friction resistance and washing resistance. At the same time, the construction methods of super-amphiphobic materials mentioned in most literatures are complicated and costly.

Method used

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  • Superhydrophobic oleophobic modification method of porous membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Put 0.5g SiO 2 The nanoparticles were added to a beaker containing 60 ml of cyclohexane, and ultrasonically oscillated for 15 min to obtain a uniform dispersion; then 0.5 ml of trichloro(1H, 1H, 2H, 2H perfluorooctyl) silane was added dropwise, and at the same time Stir on a heated magnetic stirrer for 4 hours to control the temperature of the dispersion at 50°C; then centrifuge the dispersion at 1000 rpm for 10 minutes, and dry and grind the obtained precipitate for later use, which is the modified silica particles .

[0033] The above-mentioned modified nano-SiO 2 The particles can be used for amphiphobic modification on the surface of polyvinylidene chloride (PVDF) porous membranes to prepare amphiphobic composite membranes, including the following steps:

[0034] (a) 0.3 g of modified SiO 2 The nanoparticles were added to a beaker containing 40 ml of ethanol, and stirred at room temperature for 3 h on a magnetic stirrer. A homogeneous dispersion was obtained....

Embodiment 2

[0038] 1. Put 0.3g SiO 2 The nanoparticles were added to a beaker containing 60ml of n-hexane, and ultrasonically oscillated for 20min to obtain a uniform dispersion; then 0.5ml of trichloro(1H, 1H, 2H, 2H perfluorooctyl) silane was added dropwise, while heating Stir on a magnetic stirrer for 6 hours to control the temperature of the dispersion at 60°C; then centrifuge the dispersion at 800 rpm for 10 minutes, and dry and grind the obtained precipitate for later use, which is the modified silica particles.

[0039] 2. 0.5g of modified SiO 2The nanoparticles were added to a beaker containing 50 ml of ethanol, and stirred at room temperature for 3 h on a magnetic stirrer. At the same time, 0.5 ml of trichloro(1H, 1H, 2H, 2H perfluorooctyl)silane was added dropwise, and stirring was continued for 4 h to obtain Homogeneous dispersion.

[0040] 3. Cut a certain size of PVDF porous membrane and place it in the ultrafiltration cup, pour the above-prepared dispersion liquid into the...

Embodiment 3

[0042] 1. Put 0.5g SiO 2 The nanoparticles were added to a beaker containing 60ml of n-hexane, and ultrasonically oscillated for 15min to obtain a uniform dispersion; then 0.5ml of trichloro(1H, 1H, 2H, 2H perfluorooctyl) silane was added dropwise, while heating Stir on a magnetic stirrer for 5 hours, so that the temperature of the dispersion liquid is controlled at 60 ° C; then the dispersion liquid is centrifuged at 1000 rpm for 10 min, and the obtained precipitate is dried and ground for later use, that is, modified silica particles.

[0043] The above-mentioned modified nano-SiO 2 The particles can be used for amphiphobic modification on the surface of a polytetrafluoroethylene (PTFE) porous membrane to prepare an amphiphobic composite membrane, including the following steps:

[0044] a. 0.5g of modified SiO 2 The nanoparticles were added to a beaker containing 60 ml of cyclohexane, and stirred on a magnetic stirrer at room temperature for 2 h, while 0.3 ml of trichloro(...

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Abstract

The invention relates to a superhydrophobic oleophobic modification method of a porous membrane, and belongs to the technical field of separation membrane. According to the present invention, based on the self-cleaning bionic principle, fluorosilane-modified SiO2 nanoparticles having low surface energy are dispersed in an organic solution to prepare a uniform dispersion liquid, and a porous membrane is subjected to superhydrophobic oleophobic modification by using a dynamic filtration method to prepare the amphiphobic composite membrane having good stability, wherein the water contact angle of the amphiphobic composite membrane surface can achieve 167.3+/-1 DEG C, the contact angle of diiodomethane can achieve 145.9+/-1 DEG C, and the good amphiphobic property is presented; and method has characteristics of no requirement of complex equipment, simple and easy-performing process and short preparation period, and the prepared membrane has characteristics of high flux and good pollution resistance.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of separation membranes, and in particular relates to a method for superhydrophobic and oleophobic modification of porous membranes. membrane distillation. Background technique [0003] Membrane distillation is a new desalination technology that combines membrane technology and distillation technology. Compared with the traditional distillation process, it has the advantages of low operating pressure, low operating temperature and high separation efficiency. Membrane distillation is widely used in the desalination of seawater brackish water, the concentration of fruit juice and liquid food, and the treatment of wastewater. Membrane distillation technology has great advantages in some aspects of industrial application, but so far there is no report on large-scale industrial application, which is mainly limited by the constraints of membrane materials and membrane fouling. On the one hand, the membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D67/00
Inventor 彭跃莲路雪梅
Owner BEIJING UNIV OF TECH
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