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Polyvinylidene fluoride-based composite material with high dielectric, low loss and high breakdown strength as well as preparation method and application of polyvinylidene fluoride-based composite material

A technology of polyvinylidene fluoride and high breakdown strength, applied in the field of application, can solve the problems of not being able to meet high dielectric properties, and achieve the effects of light weight and miniaturization, low dielectric loss, and increased dielectric constant

Pending Publication Date: 2021-12-10
HARBIN UNIV OF SCI & TECH
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  • Description
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  • Application Information

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Problems solved by technology

At the same time, PVDF also has excellent properties such as good flexibility and thermal stability, but polyvinylidene fluoride is a thermoplastic polymer, and its limited dielectric constant cannot meet the high dielectric properties of high-performance capacitors and energy storage devices. Require

Method used

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  • Polyvinylidene fluoride-based composite material with high dielectric, low loss and high breakdown strength as well as preparation method and application of polyvinylidene fluoride-based composite material
  • Polyvinylidene fluoride-based composite material with high dielectric, low loss and high breakdown strength as well as preparation method and application of polyvinylidene fluoride-based composite material
  • Polyvinylidene fluoride-based composite material with high dielectric, low loss and high breakdown strength as well as preparation method and application of polyvinylidene fluoride-based composite material

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Embodiment 1

[0028] The sodium bismuth titanate used in this example is prepared by hydrothermal method using bismuth nitrate pentahydrate as bismuth source, tetrabutyl titanate as titanium source, sodium hydroxide as sodium source and mineralizer at the same time; specifically Yes, the steps are as follows:

[0029] S1: Dissolve 0.003 mol of bismuth nitrate pentahydrate and 0.006 mol of tetrabutyl titanate in 15 mL of deionized water and stir evenly.

[0030] S2: Slowly titrate the sodium hydroxide solution with a concentration of 12 mol / L into the mixed solution obtained in step S1, and then place it on a magnetic stirrer and stir for 30 minutes until the precipitation is complete to obtain a hydrothermal reaction precursor.

[0031] S3: Transfer the precursor obtained in S2 to an autoclave, keep the filling degree in the autoclave at 60%, and react the autoclave in a vacuum oven at 180°C for 24h.

[0032] S4: After the reaction, cool naturally in the reaction kettle to room temperature...

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Abstract

The invention discloses a polyvinylidene fluoride-based composite material with high dielectric, low loss and high breakdown strength and a preparation method and application of the polyvinylidene fluoride-based composite material, and belongs to the application fields of high-performance capacitors, energy storage devices and the like. The invention aims to solve the technical problem that the dielectric constant of PVDF is limited and is difficult to meet the requirements of capacitors and energy storage devices on high dielectric properties. The preparation method comprises the following steps: firstly, modifying nano sodium bismuth titanate with a silane coupling agent, taking polyvinylidene fluoride as a matrix; adding silane coupling agent modified nano sodium bismuth titanate into N, N-dimethylformamide, carrying out ultrasonic stirring for 2 hours, adding polyvinylidene fluoride powder, and carrying out ultrasonic stirring reaction for 2 hours; paving a film and drying; and hot-pressing. The method is used for manufacturing capacitors and energy storage devices.

Description

technical field [0001] The invention belongs to the application field of high-performance capacitors and energy storage devices, and specifically relates to a polyvinylidene fluoride (PVDF)-based composite material with high dielectric, low loss and high breakdown strength, a preparation method and application thereof. Background technique [0002] Dielectric capacitors are expected to become the most promising devices for energy storage capacitors due to their ultra-fast charge and discharge speed, high power density, and low loss. At present, dielectric capacitors have been widely used in new energy power generation systems, hybrid vehicles, aerospace equipment, and electromagnetic pulse systems. The need for cost has also become more urgent. [0003] Although most dielectric polymers have the advantages of high breakdown field strength, low cost, easy processing, good flexibility, and light weight, they often have low dielectric constants and are difficult to meet higher...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08K9/06C08K3/24C08K7/18H01G4/18
CPCC08J5/18H01G4/186C08J2327/16C08K9/06C08K3/24C08K7/18
Inventor 翁凌许子祺关丽珠王小明
Owner HARBIN UNIV OF SCI & TECH
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