A kind of core/shell structure zinc particle/pvdf dielectric material and preparation method thereof

Abstract

The invention relates to a core / shell structural zinc particle / PVDF (polyvinylidene fluoride) dielectric medium and a preparation method thereof. The core / shell structural zinc particle / PVDF dielectric medium comprises 50 to 60wt% of PVDF resin and 40 to 50 wt% of surface modified composite structural zinc particles; the core-shell structural zinc particle / PVDF dielectric medium is prepared in the steps such as peroxidation, powder mixing, cold pressing, hot pressing and the like. Based on a multi-interface polarization mode between the composite zinc particle and the polymer, the dielectric constant of polymer dielectric medium is improved by changing the thickness of ZnO so as to effectively control the variation of system dielectric constant, loss and electric conductivity, and the dielectric loss is reduced. Through the little consumption of composite particles, the composite dielectric medium has high mechanic strength and flexibility.

Description

technical field [0001] The invention belongs to the cross-manufacturing field of electrical materials and chemical products, and in particular relates to a core / shell structure zinc particle / PVDF dielectric and a preparation method thereof. Background technique [0002] The high dielectric constant polymer dielectric with low cost, easy processing, light weight and good mechanical properties combines many properties of traditional dielectric materials with the characteristics of excellent toughness, low cost and easy processing and molding of polymers, which has attracted widespread attention in the world. Follow and research. High dielectric constant polymer dielectrics have been widely used in the preparation of embedded multilayer film capacitors and high energy storage capacitors; in addition, they have also been important in the fields of microelectronics, electrical engineering, micro-electromechanical and biological engineering. Its research is a very active field an...

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Problems solved by technology

Specifically, the dielectric properties of this type of composite material are very sensitive to its influencing factors (especially the relevant parameters of the conductor). For example, a slight change in the amount of filler near the percolation threshold will cause a sharp change in the conductivity of the system, which gives it a Production control and stability of material properties have brought great difficulties and challenges

[0006] In addition, when the dielectric constant of the conductor / polymer dielectric reaches the highest near the percolation threshold of the conductor filler, its dielectric loss is often particularly large, which will undoubtedly reduce its breakdown voltage and performance

[0007] 2) When the amount of filler particles is high (≥70wt%), the ferroelectric ceramic particles / polymer dielectric often obtains a high dielectric constant, which will seriously reduce the mechanical strength and toughness of the dielectric material, and also bring high dielectric loss

[0008] Due to the loss of mechanical strength and impact toughness, high dielectric constant polymer dielectrics cannot be used in practical engineering applications, and high loss will reduce the breakdown voltage of polymers

[0009] Many studies have shown that it is impossible to obtain polymer dielectric materials with stable dielectric constant and low loss only by relying on conductive particles such as metals and carbon materials or ferroelectric particles.

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