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Preparing method of super-hydrophobic polyvinylidene fluoride membrane and its application in gas-liquid membrane contactors

A polyvinylidene fluoride film and a technology of polyvinylidene fluoride are applied in the field of preparation of super-hydrophobic polyvinylidene fluoride film, which can solve the problems of complex production process, insufficient hydrophobicity of PVDF film, unsuitable for large-area preparation, etc. Good performance, low cost, and the effect of improving service life

Inactive Publication Date: 2015-09-09
TANGSHAN COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a superhydrophobic polyvinylidene fluoride membrane and its application in a gas-liquid membrane contactor, so as to solve the problem of insufficient hydrophobicity of PVDF membranes and the production process. Complicated, not suitable for large area preparation problems

Method used

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  • Preparing method of super-hydrophobic polyvinylidene fluoride membrane and its application in gas-liquid membrane contactors
  • Preparing method of super-hydrophobic polyvinylidene fluoride membrane and its application in gas-liquid membrane contactors
  • Preparing method of super-hydrophobic polyvinylidene fluoride membrane and its application in gas-liquid membrane contactors

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Mix the dried polyvinylidene fluoride powder and N,N-dimethylacetamide at a weight ratio of 20:80, and stir slowly for 5 hours on a magnetic stirrer with heating, so that the temperature of the membrane liquid is controlled at 50°C , to obtain a uniform and clear casting solution; then put the casting solution in a 50°C oven, let it stand for degassing for 20 hours, make it fully mature, and set it aside.

[0040] At room temperature, scrape the casting solution on the glass plate evenly and quickly, then use the phase inversion method to form a film in the coagulation bath of purified water, soak in the coagulation bath of purified water for 12 hours, wash and dry in vacuum Dried in a container.

[0041] Disperse the Zonyl® 8740 surfactant evenly in distilled water to obtain a homogeneous and transparent aqueous solution. The concentration of the Zonyl® 8740 aqueous solution is 10%, and it is ready for use.

[0042] Finally, soak the polyvinylidene fluoride film in Zo...

Embodiment 2

[0044] Mix the dried polyvinylidene fluoride powder and N,N-dimethylacetamide at a weight ratio of 15:85, and stir slowly on a heated magnetic stirrer for 8 hours to control the temperature of the membrane liquid at 70°C , to obtain a uniform and clear casting solution; then put the casting solution in an oven at 70°C, and let it stand for degassing for 24 hours, so that it can be fully matured and ready for use.

[0045] At room temperature, scrape the casting solution evenly and quickly on the glass plate, and then use the phase inversion method to form a film in the coagulation bath of n-propanol. After soaking in the coagulation bath of n-propanol for 20 hours, wash , dried in a vacuum desiccator.

[0046] Disperse the Zonyl® 8740 surfactant evenly in distilled water to obtain a homogeneous and transparent aqueous solution. The concentration of the Zonyl® 8740 aqueous solution is 15%, and it is ready for use.

[0047] Finally, soak the polyvinylidene fluoride film in Zony...

Embodiment 3

[0049]Mix the dried polyvinylidene fluoride powder and N,N-dimethylacetamide at a weight ratio of 10:90, and stir slowly for 7 hours on a magnetic stirrer with heating, so that the temperature of the membrane liquid is controlled at 60°C , to obtain a uniform and clear casting solution; then put the casting solution in an oven at 60°C, and let it stand for degassing for 24 hours, so that it can be fully matured and ready for use.

[0050] At room temperature, scrape the casting solution evenly and quickly on the glass plate, and then use the phase inversion method to form a film in the coagulation bath of ethanol, soak in the coagulation bath of ethanol for 24 hours, wash and dry in vacuum appliance dry.

[0051] Disperse the Zonyl® 8740 surfactant evenly in distilled water to obtain a homogeneous and transparent aqueous solution. The concentration of the Zonyl® 8740 aqueous solution is 5%, and set aside.

[0052] Finally, soak the polyvinylidene fluoride film in a Zonyl® 874...

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Abstract

The invention relates to the technical field of membrane preparation, in particular to a preparing method of a super-hydrophobic polyvinylidene fluoride membrane and its application in gas-liquid membrane contactors. Based on self-cleaning bionics, the polyvinylidene fluoride membrane surface of a micro-nano double-rough structure is prepared by a weak solidifier cured phase-inversion method; a substance of low surface energy is introduced to the rough polyvinylidene fluoride membrane surface by a coating process so as to modify the low surface energy and obtain a super-hydrophobic polyvinylidene fluoride flat membrane good in breathability; the surface water contact angle of such membrane is up to 151.24 degrees. The preparing method has the advantages that moisture resistance of the membrane contactors can be evidently improved, mass transfer resistance of the membrane contactors is lowered, the service life of each membrane contactor is prolonged, and the service performance of each gas-liquid membrane contactor is improved; the preparing method is simple, low in cost and easy to operate and allows feasibility for the preparation of large-area super-hydrophobic membrane surfaces.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a preparation method of a superhydrophobic polyvinylidene fluoride membrane and its application in a gas-liquid membrane contactor. Background technique [0002] The traditional way to capture acid gas is to use absorption and desorption devices to capture acid gas. The disadvantages are: it is difficult to accurately estimate the gas-liquid mass transfer area and the limited gas and liquid flow rate operating range, and when operating at a relatively high gas rate, the gas-liquid interface area is unstable, and mist entrainment, liquid flooding, and liquid leakage are prone to occur And other issues. In recent years, in order to overcome the shortcomings of traditional gas capture methods, an alternative technology using porous membranes as gas-liquid membrane contactors to achieve non-dispersive separation of gases is emerging. Different from the pore size screen...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D53/22
Inventor 李颖娜徐志彬张玉忠刘艳娟么琳
Owner TANGSHAN COLLEGE
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