Preparation method of polyvinylidene fluoride (PVDF) composite mesoporous membrane

A polyvinylidene fluoride and composite membrane technology, which is applied in chemical instruments and methods, membrane technology, and semipermeable membrane separation, can solve the problems of high requirements for inorganic particles, uneven pore size of kaolin, and low modification efficiency. Achieve the effect of low cost, uniform distribution and simple preparation method

Inactive Publication Date: 2014-06-18
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 102240510 A "A Preparation Method for Superhydrophilic Polyvinylidene Fluoride Membrane" adopts the method of blending and phase inversion to form a membrane to introduce active groups into the membrane material, and then immerse the membrane material in a solution containing aminosilane Reactive modification to form an organic-inorganic hybrid membrane surface with certain hydrophilic components and nanostructures. Although this method is simple in process and stable in superhydrophilic performance, the modification efficiency is not high and is limited to the modification of the membrane surface.
Chinese Patent CN 101319081 A "A Hydrophilic PVDF Material and Its Preparation Method" blends different ratios of raw materials in a molten state, and selects kaolin as the inorganic material. The polyvinylidene fluoride (PVDF) film prepared ...

Method used

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  • Preparation method of polyvinylidene fluoride (PVDF) composite mesoporous membrane
  • Preparation method of polyvinylidene fluoride (PVDF) composite mesoporous membrane
  • Preparation method of polyvinylidene fluoride (PVDF) composite mesoporous membrane

Examples

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Effect test

Embodiment 1

[0037] Preparation of Polytetrafluoroethylene Composite Mesoporous Membrane Without Diluent

[0038] (1) First, weigh the polyvinylidene fluoride (PVDF) that has been baked in an oven at 105°C for 4 hours, and its mass fraction is 10% (PVDF), 1% porogen polyvinylpyrrolidone (PVP), and dissolve them in In N,N-methylacetamide (DMAc) solvent, place in a 60°C water bath, stir magnetically (the stirring speed is constantly adjusted from 800rpm to 150rpm) for 8h, and make a polyvinylidene fluoride (PVDF) casting solution;

[0039] (2) Next, add mesoporous silica (SBA-15) with a mass fraction of 1% to the above casting solution, place in a 60°C water bath, and stir mechanically for 15 hours to make a PVDF-SBA-15 casting film liquid, seal it with a parafilm, and let stand at room temperature (25°C) for 2 days for defoaming;

[0040] (3) Then, use the automatic film coating machine to apply the prepared PVDF-SBA-15 film casting solution on a clean glass substrate, and immerse it in 50...

Embodiment 2

[0043] Preparation of Polyvinylidene Fluoride Composite Mesoporous Membrane Added Diluent Acetone

[0044] (1) First, weigh 15% polyvinylidene fluoride (PVDF) and 4% porogen polyvinylpyrrolidone (PVP) which were baked in an oven at 105°C for 4 hours, and dissolve them in N,N-methyl ethyl ether In amide (DMAc) solvent, placed in a 65°C water bath, magnetically stirred (stirring speed is constantly adjusted from 800rpm to 150rpm) for 8h, to make polyvinylidene fluoride (PVDF) casting solution;

[0045] (2) Next, add mesoporous silica (SBA-15) with a mass fraction of 3% and 0.1mL / g acetone to the above casting solution, place in a 65°C water bath, and stir mechanically for 15 hours to make PVDF -SBA-15 casting solution, seal it with a parafilm, and let it stand at room temperature (25°C) for 2 days for defoaming;

[0046] (3) Then, use the automatic film coating machine to apply the prepared PVDF-SBA-15 film casting solution on a clean glass substrate, and immerse it in 50% etha...

Embodiment 3

[0049] Preparation of Polyvinylidene Fluoride Composite Mesoporous Membrane Added Diluent Acetone

[0050] (1) First, weigh 18% polyvinylidene fluoride (PVDF) and 7% porogen polyvinylpyrrolidone (PVP) which have been baked in an oven at 105°C for 4 hours, and dissolve them in N,N-dimethyl In acetamide (DMAc) solvent, placed in 65°C water bath, magnetically stirred (stirring speed is constantly adjusted from 800rpm to 150rpm) for 8h, to make polyvinylidene fluoride (PVDF) casting solution;

[0051] (2) Next, add mesoporous silica (SBA-15) with a mass fraction of 4% and 0.2mL / g acetone to the above casting solution, place in a 65°C water bath, and stir mechanically for 15 hours to make PVDF -SBA-15 casting solution, seal it with a parafilm, and let it stand at room temperature (25°C) for 2 days for defoaming;

[0052] (3) Then, use the automatic film coating machine to apply the prepared PVDF-SBA-15 film casting solution on a clean glass substrate, and immerse it in 50% ethanol...

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Abstract

The invention belongs to the technical field of preparation of composite membranes, and relates to a preparation method of a polyvinylidene fluoride (PVDF) mesoporous membrane, and the method includes the following steps: dissolving polyvinylidene fluoride powder in an organic solvent, adding a pore forming agent, stirring evenly to prepare a polyvinylidene fluoride membrane casting solution; adding SBA-15 to obtain a mixed solution, heating and stirring the mixed solution to prepare a polyvinylidene fluoride-silica membrane casting solution; sealing, standing for defoaming; using an automatic coating machine to coat a glass substrate with the PVDF-SBA-15 membrane casting solution, and immersing the glass substrate in a solidification liquid to obtain a polyvinylidene fluoride-silica composite membrane. The preparation method is simple in operation, the membrane is prepared at low temperature, the polymer degradation can be reduced, the strength of the membrane is ensured, the prepared PVDF-SBA-15 can effectively improve the hydrophilic ability and water flux of the membrane, and the membrane has good application prospects in the field of water pollutant removal.

Description

technical field [0001] The invention belongs to the technical field of composite membrane preparation, and relates to a method for preparing a polyvinylidene fluoride mesoporous membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is a widely used polymer separation membrane material. Compared with polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), etc., it has good chemical stability and mechanical strength. High, acid and alkali resistance and other characteristics. Polyvinylidene fluoride (PVDF) film is easy to prepare and low in cost. It can still maintain good strength under certain temperature and pressure, and has good resistance to ultraviolet rays and weather aging. Its film can be placed outdoors for one to twenty years It will not be brittle or cracked. In addition, it is not corroded by acids, alkalis, strong oxidants and halogens at room temperature, and organic solvents such as aliphatic hydrocarbons, alcohols, and aldehydes ha...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00C02F1/44
Inventor 范建伟李丹丹闵弘扬姜序
Owner TONGJI UNIV
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