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Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method

A polyvinylidene fluoride and composite film technology, which is applied in the direction of film/thick film capacitors, laminated capacitors, conductive coatings, etc., can solve the problems of film elongation reduction, etc., and achieve good mechanical properties and processability, high dielectric strength Performance, Effect of Low Dielectric Loss

Active Publication Date: 2015-04-01
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal conductive powder, ceramic particles and rubber particles are added to the PVDF-based coating. Among them, the metal particles, ceramic particles and PVDF-based coating can effectively reduce the dielectric loss while improving the dielectric properties; adding rubber particles can solve the problem. The problem of film elongation reduction caused by adding ceramic particles

Method used

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  • Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method
  • Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method
  • Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method

Examples

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preparation example Construction

[0020] The present invention further provides a preparation method of polyvinylidene fluoride / polypropylene high dielectric composite film, comprising the following steps:

[0021] 1) Add metal conductive powder, barium titanate, rubber particles, and polyvinylidene fluoride resin into the solvent, dissolve or disperse evenly to form a coating solution, wherein, calculated according to the volume fraction, the metal conductive powder is 0-20%, titanium Barium acid is 20-60%, rubber particles are 0-20%, and the rest is polyvinylidene fluoride;

[0022] 2) Apply the coating solution prepared in 1) evenly on both sides of the polypropylene dielectric film with the same thickness, and dry to obtain a polyvinylidene fluoride / polypropylene composite dielectric film.

[0023] In some embodiments, the metal conductive powder in step 1) is Al powder.

[0024] In other embodiments, the metal conductive powder and barium titanate in step 1) are γ-Al powder and γ-barium titanate.

[002...

Embodiment 1

[0052] (1) According to volume percentage percentage f Al =0.10,f BaTiO3 =0.40,f 橡胶颗粒 =0.10, f PVDF =0.40 Weigh the material, and convert the volume fraction into mass and weigh 2.702g, 24.4g, 0.439g, 7.12g in turn;

[0053] (2) Add 7.12g of PVDF (KYNAR761) weighed into 28.48g of N,N-dimethylacetamide (DMAc), stir and dissolve at 500rpm at 80°C for 8 hours to obtain a transparent solution of PVDF;

[0054] (3) Al powder (original Al powder, average particle size 80nm) and BaTiO 3 (pristine BaTiO 3 Particles, average particle size 100nm) were added to 70.503g of DMAc, followed by magnetic stirring for 30 minutes and ultrasonic dispersion for 30 minutes to make the Al powder and BaTiO 3 Uniformly dispersed in DMAc to form a uniform dispersion;

[0055] (4) Add 0.439g of rubber particles (DOWEXL2313, average particle size 500nm) into 5g of DMAc, wherein the core of the rubber particles is acrylic rubber, and the shell is polymethyl methacrylate. Magnetic stirring for 30 mi...

Embodiment 2

[0060] In Example 1, the original Al powder was changed to γ-Al powder treated with silane coupling agent KH55, except that, other operations were the same, and a PVDF / PP composite dielectric film with a thickness of 8 μm was obtained.

[0061] For the obtained film, performance tests such as volume resistivity, breakdown field strength, mechanical properties, dielectric loss and dielectric constant at 1 kHz at 23° C. were performed, and the test standards were the same as in Example 1. The test results are shown in Table 1.

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Abstract

The invention provides a polyvinylidene fluoride / polypropylene composite film for a film capacitor. A base film of the polyvinylidene fluoride / polypropylene composite film is a polypropylene dielectric film; the upper surface and the lower surface of the base film are respectively coated with polyvinylidene-fluoride-based coatings with same thickness; the polyvinylidene-fluoride-based coatings comprise the following components in volume fraction: 0-20% of metal conductive powder, 20%-60% of barium titanate, 0-20% of rubber particles and the balance of polyvinylidene fluoride. The prepared polyvinylidene fluoride / polypropylene composite film is high in dielectric property, low in dielectric loss and good in mechanical property and processability. The invention further provides a preparation method of the polyvinylidene fluoride / polypropylene composite film for the film capacitor. The preparation method is simple, feasible and applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a polyvinylidene fluoride / polypropylene composite film and a preparation method thereof. Background technique [0002] With the rapid development of the microelectronics industry, the demand for miniaturized capacitors is becoming more and more urgent. In order to obtain capacitors with small size, light weight and high energy storage density at the same time, it is key to develop dielectric films with low density, high dielectric constant and low dielectric loss as dielectric materials. [0003] Traditional organic film dielectric materials are mostly single-phase polymer materials, such as polypropylene (PP), polyethylene terephthalate (PET), etc., due to the low dielectric constant of these materials, production The capacitance density of the capacitor film is low, which can no longer meet the needs of industry development. In addition, ceramic material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08L23/12C09D127/16C09D5/24C09D7/12H01G4/33
Inventor 李义涛栗彦娜汤诚邹智杰王超程丛陆翠方
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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