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Gradient structure polyvinylidene fluoride based composite dielectric and preparation method thereof

A polyvinylidene fluoride and composite dielectric technology, which is applied in the fields of fixed capacitor dielectric, rayon manufacturing, single-component halogenated hydrocarbon artificial filament, etc., can solve the problems of excessive local electric field distortion, low energy storage density, and breakdown resistance Low strength and other problems, to achieve the effect of homogenizing local electric field, simple preparation process, and good breakdown resistance

Active Publication Date: 2018-12-14
HARBIN UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The invention aims to improve the problems of local dielectric difference and excessive local electric field distortion between the high-content inorganic ceramic filling phase and the polymer matrix in the composite material, and at the same time solve the problems of low breakdown strength and low energy storage density of dielectric capacitor materials at the present stage To solve the problem, a gradient structure polyvinylidene fluoride-based composite medium with high breakdown and high energy storage density and its preparation method are provided

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  • Gradient structure polyvinylidene fluoride based composite dielectric and preparation method thereof
  • Gradient structure polyvinylidene fluoride based composite dielectric and preparation method thereof
  • Gradient structure polyvinylidene fluoride based composite dielectric and preparation method thereof

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specific Embodiment approach 1

[0037] Specific embodiment 1: The gradient structure polyvinylidene fluoride-based composite medium provided by this embodiment is composed of one-dimensional barium-calcium zirconate titanate nanofibers (BZCT NFs) filled phase and PVDF composite. The BZCT NFs filled phase is composited The medium is arranged in multiple layers with a content gradient, and BZCT NFs account for 1-10 vol% of the total volume of the composite dielectric.

[0038] The above-mentioned method for preparing polyvinylidene fluoride-based composite media with a gradient structure combines the sol-gel method, electrospinning technology, and hot pressing to prepare a large aspect ratio inorganic nanofiber filled phase and polyvinylidene fluoride-based composite film media. , And the nanofiber / polymer-based composite film medium is subjected to high-temperature hot pressing and quenching treatment to obtain a dense composite film. Specific steps are as follows:

[0039] Step 1: Dissolve barium hydroxide and c...

specific Embodiment approach 2

[0044] Specific implementation manner 2: The gradient structure polyvinylidene fluoride-based composite medium provided by this embodiment is composed of one-dimensional barium calcium zirconate titanate nanofibers (BZCT NFs) filled phase and PVDF composite. The BZCT NFs filled phase is composited The dielectric is arranged in multiple layers with a content gradient, and BZCT NFs account for 5vol% of the total volume of the composite dielectric.

[0045] The preparation steps of the above-mentioned gradient structure polyvinylidene fluoride vinyl composite medium are as follows:

[0046] Step 1: Dissolve barium hydroxide and calcium hydroxide octahydrate in acetic acid, stir them at 50°C to a clear solution and then cool to room temperature; then add acetylacetone and zirconium acetylacetonate, continue to stir until clear; finally drop slowly Add tetrabutyl titanate and stir at room temperature to obtain a BZCT precursor solution. Control the stoichiometric ratio of Ba:Ca:Zr:Ti to...

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Abstract

The invention discloses a gradient structure polyvinylidene fluoride based composite dielectric and a preparation method thereof. The composite dielectric is composed of a BZCT NFs filling phase and PVDF (Polyvinylidene Fluoride), wherein the BZCT NFs filling phase is in content gradient multilayer arrangement in the composite dielectric. According to the invention, a large aspect ratio inorganicnanofiber filling phase and polyvinylidene fluoride based composite thin film dielectric is prepared by combining the processes such as a sol-gel method, an electrospinning technique and hot pressing,and the nanofiber / polymer based composite thin film dielectric is subjected to high-temperature hot pressing and quenching treatment to obtain a compact composite thin film. The multilayer structure / polymer based composite dielectric with one-dimensional nano filling phase content gradient prepared according to the invention has the characteristics of good flexibility, low cost, high breakdown strength, excellent energy storage performance and the like, can buffer local electric field distortion caused by the high-content inorganic filling phase, thus improves the energy storage performance,and is used for manufacturing high-performance energy storage devices.

Description

Technical field [0001] The invention belongs to the field of dielectric capacitors, and relates to a polymer-based dielectric nano composite material and a preparation method thereof, and in particular to a multilayer structure / polymer-based composite dielectric with a one-dimensional nano-filled phase content gradient and a preparation method thereof. Background technique [0002] In contemporary aerospace, automobile manufacturing and defense industries, polymer-based composite dielectric materials play a pivotal role. Although the polymer dielectric material itself has low relative permittivity and low energy storage density, it has restricted its practical application in the field of dielectric energy storage, but its low production cost, simple preparation process, excellent flexibility and good The breakdown resistance makes it an excellent candidate for the matrix required in the preparation of composite dielectric materials. In addition, in order to improve the energy st...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4382D01F6/48D01F1/10H01G4/16
CPCD01F1/10D01F6/48D04H1/4382D04H1/728H01G4/16
Inventor 迟庆国张月张天栋张昌海王暄
Owner HARBIN UNIV OF SCI & TECH
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