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Preparation method for polyvinylidene fluoride (PVDF) porous film

A technology of polyvinylidene fluoride and porous film, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of separation and treatment of oil/water mixture limited by the preparation of polymer separation membranes, and achieve low cost and high raw material Ease of availability, good mechanical strength and flexibility

Active Publication Date: 2016-08-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple, convenient, and large-area method for preparing polyvinylidene fluoride porous membranes, thereby solving the limitations of the preparation of polymer separation membranes and the separation and treatment of oil / water mixtures

Method used

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  • Preparation method for polyvinylidene fluoride (PVDF) porous film
  • Preparation method for polyvinylidene fluoride (PVDF) porous film
  • Preparation method for polyvinylidene fluoride (PVDF) porous film

Examples

Experimental program
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Embodiment 1

[0029] (1) Preparation of polymer precursor solution: 0.6 g of polyvinylidene fluoride (PVDF) powder was added to 10 mL of dimethylformamide (DMF) solvent, and stirred for 30 min to form a concentration of 6% PVDF / DMF translucent solution. Add 0.168 g (8 mmol) citric acid monohydrate (CAM) particles to 10 mL of the above solution, and stir for another 30 min to form a transparent mixed solution before use.

[0030] (2) Forming of the film: prepare a glass plate of fixed size (8×8×8 cm) in advance, first clean it ultrasonically with acetone for 20 min, then rinse it with deionized water and ethanol in turn, and finally dry it before use. Take 2 mL of the above-prepared CAM / PVDF / DMF precursor solution with a plastic straw, drop it on the cleaned glass substrate, spread the solution completely by casting method, and place it in an oven at 60 °C obliquely. After 30 min, the PVDF film containing CAM grains was solidified and formed on the glass substrate.

[0031] (3) The detach...

Embodiment 2

[0035] (1) Preparation of polymer precursor solution: 0.6 g of polyvinylidene fluoride (PVDF) powder was added to 10 mL of dimethylformamide (DMF) solvent, and stirred for 30 min to form a concentration of 6% PVDF / DMF translucent solution. Add 0.126g (6mmol) citric acid monohydrate (CAM) particles to 10 mL of the above solution, and stir for another 30 min to form a transparent mixed solution before use.

[0036] (2) Forming of the film: prepare a glass plate of fixed size (8×8×8 cm) in advance, first clean it ultrasonically with acetone for 20 min, then rinse it with deionized water and ethanol in turn, and finally dry it before use. Take 2 mL of the above-prepared CAM / PVDF / DMF precursor solution with a plastic straw, drop it on the cleaned glass substrate, spread the solution completely by casting method, and place it in an oven at 60 °C obliquely. After 30 min, the PVDF film containing CAM grains was solidified and formed on the glass substrate.

[0037] (3) The detachme...

Embodiment 3

[0040] (1) Preparation of polymer precursor solution: 0.4 g of polyvinylidene fluoride (PVDF) powder was added to 10 mL of dimethylformamide (DMF) solvent, and stirred for 30 min to form a concentration of 4% PVDF / DMF translucent solution. Add 0.126 g (6 mmol) of citric acid monohydrate (CAM) particles to 10 mL of the above solution, and stir for another 30 min to form a transparent mixed solution before use.

[0041] (2) Forming of the film: Prepare a glass plate of fixed size (8×8×8 cm) in advance, first clean it ultrasonically with acetone for 20 min, then rinse it with deionized water and ethanol in turn, and finally dry it before use. Take 2 mL of the above-prepared CAM / PVDF / DMF precursor solution with a plastic straw, drop it on the cleaned glass substrate, spread the solution completely by casting method, and place it in an oven at 60 °C obliquely. After 30 min, the PVDF film containing CAM grains was solidified and formed on the glass substrate.

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Abstract

The invention discloses a preparation method for a polyvinylidene fluoride (PVDF) porous film. The method comprises the following steps: adding PVDF powder into dimethyl formamide (DMF), stirring for 30-60min to form a PVDF / DMF solution in the concentration of 4%-6%, and then adding citric acid monohydrate grains into the PVDF / DMF solution and stirring for 30-60min, thereby acquiring a transparent macromolecule precursor solution; dropping the macromolecule precursor solution onto a treated glass plate, completely spreading out the solution according to a tape casting method, and then drying the glass plate at 40-70 DEG C, and curing and forming a PVDF film containing CAM on the glass plate after 20-60min; putting the cured and formed glass plate into a NaHCO3 solution and soaking for 20-40min; and taking out the film floating on the water level, washing the residual NaHCO3 solution on the film with ethyl alcohol and deionized water in turn, and then drying the film at 40-60 DEG C, thereby acquiring the PVDF porous film. The PVDF film prepared according to the preparation method provided by the invention has better mechanical strength and flexibility as well as super-oleophylic / oily super-hydrophobic property.

Description

technical field [0001] The invention relates to a preparation method of polyvinylidene fluoride porous film, which belongs to the technical field of preparation of porous polymer film capable of separating oil-water mixture and emulsion. Background technique [0002] Oily waste water, watery waste oil and offshore oil spills discharged from industrial production and domestic use have not only caused a waste of resources, but also caused damage to environmental ecology and human health. With the discovery and derivation of the superhydrophobic phenomenon, superwetting surfaces with superhydrophobic / superoleophilic and superhydrophilic / underwater superoleophobic make them show great application prospects in the field of oil / water separation. However, the most commonly used separation substrates, such as metal mesh and sponge, are limited to the separation of two-phase oil / water mixtures. [0003] Polymer materials have good mechanical properties, surface wetting properties an...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/02
CPCB01D67/0002B01D67/0081B01D67/0095B01D69/02B01D71/34B01D2325/24B01D2325/38
Inventor 郭志光陈立伟
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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