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Preparation method of PVDF (polyvinylidene fluoride) film and PVDF film

A technology of thin film and polyester film, which is applied in the field of PVDF film preparation, can solve the problem of difficult formation of β-phase PVDF, etc., and achieve the effect of convenient operation, simple process and high dielectric constant

Inactive Publication Date: 2015-09-02
NORTHWEST INST OF NUCLEAR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem that solution crystallization film formation is difficult to form β-phase PVDF, and propose a method for directly preparing β-phase PVDF film by solution casting

Method used

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  • Preparation method of PVDF (polyvinylidene fluoride) film and PVDF film
  • Preparation method of PVDF (polyvinylidene fluoride) film and PVDF film
  • Preparation method of PVDF (polyvinylidene fluoride) film and PVDF film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0037] Weigh a certain amount of PVDF powder into a round-bottomed flask, add 20mL of mixed solvent; heat and stir the flask at 60-90°C for more than 2 hours; place the flask in an ultrasonic cleaner, connect a vacuum pump, and ultrasonically pump for more than 10 minutes; Stir the flask slowly at 60-90°C for a while to obtain a transparent and uniform PVDF solution; place the cleaned glass plate on the film coating machine, adjust the width of the scraper slit and casting speed, and add the prepared PVDF Solution, casting to prepare PVDF film, and then place it in a drying oven at 80°C to dry; peel off the prepared PVDF film from the glass plate, with a thickness of 10-15 μm, cut a part of the film, cover the electrode, and measure the dielectric properties.

[0038] Table 1 The PVDF concentration used in Examples 1-6, the volume percentage of the poor solvent in the mixed solvent, and the dielectric properties of the resulting PVDF film

[0039]

[0040] Depend on figure...

Embodiment 9

[0043] Weigh 60.0g of PVDF powder into a 500mL round bottom flask, add 180mL of poor solvent and 120mL of benign solvent; install a mechanical stirrer, heat and stir at 70°C for 2h; place the flask in an ultrasonic cleaner, connect a vacuum pump, and ultrasonically Pump air for 10 minutes; then place the flask at 70°C for 20 minutes to obtain a transparent and uniform solution; adjust the width of the scraper slit, the heating temperature of the bottom plate and the casting Speed, add the prepared and treated PVDF solution, and cast the PVDF film to prepare the PVDF film. The bottom plate is heated and dried. The PVDF film is wound together with the polyester film tape. Peel off the prepared PVDF film from the polyester film tape, and obtain a PVDF film with a thickness of 1-50 μm according to the width of the scraper slit, cut part of the film, cover the electrode, and measure the dielectric properties.

[0044] Prepare multiple bottles of PVDF solution in batches, and make P...

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Abstract

The invention relates to a fluorine-containing polymer, particularly a preparation method of a PVDF (polyvinylidene fluoride) film and a PVDF film. The preparation method of the high-beta-phase-content PVDF film comprises the following steps: dissolving PVDF raw powder in a mixed solvent composed of a good solvent and a poor solvent, regulating the width of a flow casting scraper slit, carrying out flow casting on a clean glass plate or polyester film strip, and carrying out bottom plate heat drying to prepare the high-beta-phase-crystal-content PVDF film. The method can adopt the mixed solvent to control the crystalline state of the PVDF. The obtained PVDF film has the advantages of high beta-phase crystal content, high compactness, no pore, high dielectric strength and high dielectric constant, and can be used for preparing high-energy-density capacitors.

Description

technical field [0001] The invention relates to a method for preparing a PVDF film with high β-phase crystal content, dense and non-porous, high electric strength and high dielectric constant, which can be used for capacitors with high energy storage density, and belongs to the technical field of film material preparation. Background technique [0002] Polyvinylidene fluoride (polyvinylidine fluoride, referred to as PVDF) has excellent piezoelectric, ferroelectric, and thermoelectric properties, and is widely used in the preparation of new memories, capacitors, piezoelectric and thermoelectric converters. There are two methods of preparing PVDF film: melt extrusion, biaxial stretching and solution casting. The PVDF film prepared by melt extrusion biaxial stretching has good compactness and high electrical strength, but this method requires expensive equipment and a large amount of material, and is suitable for mass production. The process of preparing PVDF film by solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16
Inventor 王武尚杨静涂国荣张文峰杨裕生
Owner NORTHWEST INST OF NUCLEAR TECH
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