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
View PDF5 Cites 12 Cited by
  • 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 i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Example Embodiment

[0038] Example 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 heated magnetic stirrer to control the temperature of the membrane liquid at 50°C , Get a uniform and clear casting solution; then put the casting solution in an oven at 50°C and let it stand for 20 hours to defoam, so that it is fully matured and set aside.

[0040] At room temperature, scrape the casting liquid uniformly and quickly on the glass plate, and then use the phase inversion method to form the film in purified water in the coagulation bath. After soaking in purified water in the coagulation bath for 12 hours, wash and dry in vacuum. Dry in the 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%, ready for use.

[0042] Finally, the polyvinylidene fluoride film was immerse...

Example Embodiment

[0043] Example 2

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

[0045] At room temperature, the film casting solution is uniformly and quickly scraped on the glass plate, and then the film is formed by phase inversion in the coagulation bath of n-propanol, and the coagulation bath is immersed in n-propanol for 20 hours, and then cleaned , Dry in a vacuum dryer.

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

[0047] Finally, the polyvinylidene fluoride film was i...

Example Embodiment

[0048] Example 3

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

[0050] At room temperature, the film casting solution is uniformly and quickly scraped on the glass plate, and then the film is formed by the phase inversion method in the coagulation bath of ethanol, and the coagulation bath is immersed in ethanol for 24 hours, then cleaned and dried in a vacuum Dryer.

[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% for use.

[0052] Finally, the polyvinylidene fluoride film was immersed in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Water contact angleaaaaaaaaaa
Water contact angleaaaaaaaaaa
Water contact angleaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap