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

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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. W

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

Example Embodiment

[0029] Example 1.

[0030] (1) The masses are respectively: 5g polyvinylidene fluoride, 1g polyvinyl chloride, 1g polyethylene glycol, 93g N,N-dimethylformamide and mix uniformly, and defoam to obtain a film-forming liquid;

[0031] (2) Dip the polypropylene non-woven fabric into the film-forming solution obtained in step (1) for dip coating, and immerse the polypropylene non-woven fabric that has been dipped into the film-forming solution into a coagulation bath for curing, molding and cleaning after a doctor blade ;

[0032] (3) Immerse the film prepared in step (2) in 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 it at 60°C;

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

Example Embodiment

[0034] Example 2.

[0035] (1) The masses are respectively: 20g polyvinylidene fluoride, 8g polyethersulfone, 5g polyvinylpyrrolidone, 67g N,N-dimethylacetamide and mix uniformly, and defoam to obtain a membrane-forming liquid;

[0036] (2) Dip the polyethylene non-woven fabric into the film-forming liquid obtained in step (1) for dip coating, and immerse the polyethylene non-woven fabric that has been dipped into the film-forming liquid into a coagulation bath for curing, molding and cleaning after a doctor blade ;

[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 excess emulsion adsorbed on the surface, and then dry it at 100°C;

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

Example Embodiment

[0039] Example 3.

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

[0041] (2) Dip the polypropylene / polyethylene composite non-woven fabric into the film-forming liquid obtained in step (1) for dip coating, and immerse the non-woven fabric that has been dipped in the film-forming liquid into a coagulation bath for curing after a doctor blade. And cleaning;

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

[0043] (4) The membrane prepared in step (3) is heat-treated for 5 hours in a vacuum environment at 70°C, and finally a polyvinylidene fluoride superhydrophobic composite porous separation membrane is obtained, such as figure 1 As s...

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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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