Preparation method for polyvinylidene fluoride dielectric film

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of preparation of polyvinylidene fluoride dielectric film, can solve the problems of inability to prepare thick PVDF film, difficulty in industrialized production, and many film defects, and achieve the elimination of film defects, shortened heat treatment time, and high breakdown strength

Active Publication Date: 2018-05-25
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method described in the article cannot prepare a thinner PVDF film, and without melting treatment, there are many film defects, and it is difficult to realize industrial production by using a rigid substrate.

Method used

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  • Preparation method for polyvinylidene fluoride dielectric film
  • Preparation method for polyvinylidene fluoride dielectric film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 100g of PVDF (molecular weight: 400,000) powder, add 400g of DMAc, stir and dissolve overnight at 50°C, and obtain a clear and transparent casting solution. The aluminum foil surface-treated with silicone grease is selected as the base material, and after the micro-concave coating is carried out by the coating machine, it is dried in three ovens with a length of 2 meters, 5 meters and 3 meters, and the temperature of the three ovens is 100 ° C. , 130°C and 200°C; after drying, enter a water tank with a temperature of 20°C and a length of 4 meters for quenching; after peeling off the stripping stick, perform directional stretching at 120°C with a stretch ratio of 5:1; then enter the length of Annealing is carried out in an oven with a temperature of 3 meters and a temperature of 120°C, and PVDF film products are obtained after winding.

[0033] For the obtained film, the film thickness, breakdown strength, dielectric loss and dielectric constant (23° C., 100 Hz) we...

Embodiment 2

[0038] Weigh 260g of PVDF (molecular weight: 600,000) powder, add 1740g of DMF, stir and dissolve overnight at 80°C, and obtain a clear and transparent casting solution. The polyester film surface-treated with sodium lauryl sulfate is selected as the base material, and after slit extrusion through the coating machine, it enters three-section ovens with lengths of 2 meters, 5 meters and 3 meters for drying. The three-section oven The temperature is 80°C, 150°C and 190°C in sequence; after drying, enter a water tank with a temperature of 30°C and a length of 4 meters for quenching; after peeling off the stripping stick, perform directional stretching at 100°C, and the stretching ratio is 3: 1; Then enter an oven with a length of 3 meters and a temperature of 80°C for annealing, and obtain PVDF film products after winding.

[0039] For the obtained film, the film thickness, breakdown strength, dielectric loss and dielectric constant (23°C, 100Hz) were tested with reference to the...

Embodiment 3

[0041] Weigh 70g of PVDF (molecular weight: 500,000) powder, add 400g of NMP, stir and dissolve overnight at 50°C, and obtain a clear and transparent casting solution. The aluminum foil surface treated with silicone grease is selected as the base material, and then it is coated with a comma knife by a coating machine and then enters three sections of ovens with lengths of 2 meters, 5 meters and 3 meters for drying, and the temperature of the three sections of ovens is 130 ° C. , 160°C and 200°C; after drying, enter a water tank with a temperature of 50°C and a length of 4 meters for quenching; after peeling off the stripping rod, perform directional stretching at 80°C with a stretch ratio of 10:1; then enter the length of Annealing is carried out in an oven with a temperature of 3 meters and a temperature of 160°C, and PVDF film products are obtained after winding.

[0042] For the obtained film, the film thickness, breakdown strength, dielectric loss and dielectric constant (...

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Abstract

The invention discloses a preparation method for a polyvinylidene fluoride dielectric film. The preparation method comprises the following steps: 1) preparation of a film casting solution, adding polyvinylidene fluoride resin into an organic solvent, heating, stirring and dissolving, thereby obtaining the film casting solution; 2) and preparation of the film: coating a base material with the filmcasting solution through a coater, entering a three-section oven to dry, entering a water slot to quench after drying, stripping through stripping stick, annealing after oriented thermal stretching, and rolling, thereby obtaining a film product. The preparation method disclosed by the invention selects flexible high-temperature-resistant materials such as surface-treated aluminum foil and a polyester film as coating base materials, adopts a process treatment method integrating melting-quenching and stretching-annealing, avoids defects caused by a single method, and provides important referencefor industrial production of the polyvinylidene fluoride dielectric film. The obtained polyvinylidene fluoride dielectric film is high in beta-phase content, is thin and uniform in thickness, has excellent properties such as a high dielectric constant and great disruptive strength, and is expected to be applied to manufacturing high-energy-storage electronic apparatuses.

Description

technical field [0001] The invention relates to the field of dielectric materials, in particular to the preparation of a polyvinylidene fluoride dielectric film. technical background [0002] Polyvinylidene fluoride (PVDF) resin has excellent comprehensive properties such as high dielectric constant, excellent mechanical properties, corrosion resistance and flame retardancy. One of the organic dielectric materials of polyester (PET) film and polypropylene (PP) film made of capacitors. [0003] In the current research, most focus is on the preparation of PVDF-based composite dielectric materials, mainly including two types: one such as patent CN102558718B, which fills ceramic particles with high dielectric constant in the polymer to prepare ceramic / polymer two-phase composites , but in order to obtain a high dielectric constant, the filling amount of the ceramic is very high, which makes it difficult to process the composite material into a thin film, the thickness is genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16
CPCC08J5/18C08L27/16C08J2327/16C08L2203/16C08L2201/08
Inventor 李义涛张凌飞邹智杰程宗盛黄连红
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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