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Wetting-resisting super-hydrophobic membrane and preparation method thereof

A super-hydrophobic and hydrophobic membrane technology, applied in the field of membrane separation, can solve the problems of membrane body damage, membrane strength decrease, toxicity, etc., and achieve the effects of low surface energy, increased water production, and improved hydrophobicity

Active Publication Date: 2018-12-18
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the methods of surface coating modification, most of the coating materials are fluorine-containing low surface energy materials, which are not only toxic but also expensive
However, the surface graft modification will cause certain damage to the membrane body, resulting in a decrease in the strength of the membrane.

Method used

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  • Wetting-resisting super-hydrophobic membrane and preparation method thereof
  • Wetting-resisting super-hydrophobic membrane and preparation method thereof
  • Wetting-resisting super-hydrophobic membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] Preparation of PDMS solution

[0044] Dissolve 3 g of PDMS in 300 ml of n-hexane, stir at room temperature for one hour, then add 0.5 ml of ethoxysilane crosslinking agent and 0.2 ml of organotin catalyst and continue stirring for one hour at room temperature.

[0045] Preparation of silica sol solution

[0046] Stir the mixed solution of 170ml of absolute ethanol, 21ml of ammonia water and 13ml of deionized water at 55°C for 30 minutes, then add an appropriate amount of mixed solution of 21ml of tetraethyl orthosilicate and 5ml of absolute ethanol dropwise, and continue stirring for 2 hours.

Embodiment 1

[0047] Example 1: The original PVDF membrane was fully cleaned and dried, and then membrane distillation test was carried out.

Embodiment 2

[0048]Example 2: Immerse the washed and dried PVDF original membrane into a 2wt% PDMS solution, take it out, cure it at high temperature, and perform a membrane distillation test.

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Abstract

The invention relates to a wetting-resisting super-hydrophobic membrane and a preparation method thereof. Combined nanoparticles are coated with a low surface energy solution to form a rough structure, and a PDMS-SiO2-PDMS sandwich compound layer is formed on the surface of the membrane. The compound layer has the advantages of rough structure and low surface energy, the membrane has super hydrophobicity, and the membrane further has high wetting resistance in a membrane distilling process. The membrane can be utilized to perform direct contact type membrane distillation to treat a water bodycontaining a surface active agent, so that membrane distillation operation time is obviously prolonged, stable operation time is 20 times or more of that of a PVDF original membrane, and water production capacity can be improved by 15 times or more.

Description

technical field [0001] The invention belongs to the field of membrane separation, and relates to the process of treating water containing surfactants and the like that can quickly wet the membrane in the membrane distillation process, and is an anti-wetting super-hydrophobic membrane and a preparation method thereof. Background technique [0002] In recent years, membrane separation technology has been paid attention to by many countries, so it has also been developed rapidly. Membrane distillation is a membrane separation technology that uses a hydrophobic microporous membrane as the medium and uses the vapor pressure difference on both sides of the membrane as the driving force. During operation, the volatile components in the hot feed liquid continue to permeate the membrane under the vapor pressure difference generated by the temperature gradient on both sides of the membrane, and condense on the cold side, while the non-volatile components cannot pass through the membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/02B01D69/04B01D69/06B01D69/08B01D71/34
CPCB01D61/364B01D67/0002B01D69/02B01D69/04B01D69/06B01D69/08B01D71/34B01D2325/38
Inventor 武春瑞郭寒雨许程鑫吕晓龙唐文勇薛白褚艳洁
Owner TIANJIN POLYTECHNIC UNIV
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