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Method for preparing compound polyvinylidene fluoride super-hydrophobic porous separating membrane

A polyvinylidene fluoride, porous separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of unsatisfactory application performance and low base membrane porosity, and achieve good permeability , the effect of increasing hydrophobicity, good strength and workability

Inactive Publication Date: 2015-09-30
江西施尘新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Membrane Science and Technology" (Volume 30, April 2010) reported that a superhydrophobic polyvinylidene fluoride separation membrane was prepared by a solution phase transfer method. When the prepared high-concentration PVDF is used as the base film for coating and compounding, due to the relatively low porosity of the base film, its application performance is not ideal

Method used

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  • Method for preparing compound polyvinylidene fluoride super-hydrophobic porous separating membrane
  • Method for preparing compound polyvinylidene fluoride super-hydrophobic porous separating membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The quality is respectively: polyvinylidene fluoride of 5g, polyvinyl chloride of 1g, polyethylene glycol of 1g, N,N-dimethylformamide of 93g are mixed evenly, and defoaming obtains film making liquid;

[0031] (2) Immerse the polypropylene non-woven fabric into the film-making solution obtained in step (1) for dip coating, and dip the polypropylene non-woven fabric dipped into the film-making solution through a scraper and then immerse it in a coagulation bath for curing, molding and cleaning ;

[0032] (3) Immerse the film prepared in step (2) into a fluorocarbon polymer emulsion with a mass percentage of 1% for dip coating, take out and remove the excess emulsion adsorbed on the surface, and then dry at 60°C;

[0033] (4) The membrane prepared in step (3) was heat-treated in a vacuum environment at 80°C for 4 hours, and finally a polyvinylidene fluoride superhydrophobic composite porous separation membrane was obtained, and the static contact angle of the water s...

Embodiment 2

[0035] (1) The quality is respectively: polyvinylidene fluoride of 20g, polyethersulfone of 8g, polyvinylpyrrolidone of 5g, N,N-dimethylacetamide of 67g are mixed uniformly, and defoaming obtains film making solution;

[0036] (2) Immerse the polyethylene non-woven fabric into the film-making solution obtained in step (1) for dip coating, and dip the polyethylene non-woven fabric coated with the film-making solution through a scraper and then immerse it in a coagulation bath for curing, molding and cleaning ;

[0037] (3) Immerse the film prepared in step (2) into a polydimethylsiloxane emulsion with a mass percentage of 2% for dip coating, take out and remove the excess emulsion adsorbed on the surface, and then dry it at 100°C;

[0038] (4) The membrane prepared in step (3) was heat-treated for 6 hours in a vacuum environment at 50°C, and finally a polyvinylidene fluoride superhydrophobic composite porous separation membrane was obtained, and the static contact angle of the wa...

Embodiment 3

[0040] (1) The quality is respectively: the polyvinylidene fluoride of 10g, the polysulfone of 2g, the poly(styrene-maleic anhydride) copolymer of 2g, the diethylene glycol of 3g, the trimethyl phosphate of 70g, 13gN, N -Dimethylacetamide is mixed evenly, and degassing to obtain a film-making solution;

[0041] (2) Immerse the polypropylene / polyethylene composite non-woven fabric into the film-making solution obtained in step (1) for dip coating, and then immerse the non-woven fabric dipped in the film-making solution through a scraper and then immerse it in a coagulation bath for curing and molding and cleaning;

[0042] (3) Immerse the film prepared in step (2) into a fluorocarbon polymer emulsion with a mass percentage of 5% for dip coating, take out and remove the excess emulsion adsorbed on the surface, and then dry at 90°C;

[0043] (4) The membrane prepared in step (3) was heat-treated for 5 hours in a vacuum environment at 70° C. to finally obtain a polyvinylidene flu...

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Abstract

The invention discloses a method for preparing a compound polyvinylidene fluoride super-hydrophobic porous separating membrane. The method comprises the following steps: uniformly mixing polyvinylidene fluoride, a split-phase polymer, a pore diameter conditioning agent and a solvent, and defoaming the mixture to obtain a membrane preparing solution; then immersing a non-woven fabric into the membrane preparing solution to be dipcoated, then scraping the non-woven fabric with a cutter and immersing the scraped non-woven fabric into a coagulating bath to conduct solidification formation and cleaning, immersing a cleaned membrane into a hydrophobic modified emulsion with the mass percent of 1-5% to be dipcoated, taking the membrane out and removing excess emulsion adsorbed on the surface, and drying; conducting vacuum heat treatment on the obtained dried membrane. According to the method, blend polymer is dipcoated on the non-woven fabric through solution by a one-step phase inversion method to obtain the porous membrane, influence on the pore structure at the later stage process is less, and high porosity rate and good permeability of the membrane are ensured; the water-based emulsion and vacuum heat treatment are adopted, so that mass application of an organic solvent influencing environment and the human body is avoided; the non-woven fabric is adopted for compounding support, and the membrane is endowed with good strength and workability.

Description

technical field [0001] The invention belongs to the field of preparation of hydrophobic organic porous separation membranes, in particular to a preparation method of polyvinylidene fluoride superhydrophobic composite porous separation membranes. Background technique [0002] Membrane technology is a new type of high-efficiency separation technology, which has been widely used in many fields. According to the requirements of the application, the separation membrane can be divided into hydrophilic membrane and hydrophobic membrane. In the application process, the surface characteristics of the membrane material determine its use, and the hydrophilic / hydrophobic characteristic is one of the more important characteristics. Among many polymer membrane materials, hydrophobic filtration membrane is one of the important membrane materials, and the surface with superhydrophobic properties endows membrane materials with unique properties, and its research and application have attracte...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D69/02B01D67/00
Inventor 王建华吴凤艳
Owner 江西施尘新材料科技有限公司
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