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
CN104877151AInactive Publication Date: 2015-09-02NORTHWEST INST OF NUCLEAR TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST INST OF NUCLEAR TECH
Publication Date
2015-09-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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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