Fluorine-containing polymer/conductive fiber dielectric material and preparation method thereof

Abstract

The invention relates to a fluorine-containing polymer / conductive fiber dielectric material and a preparation method thereof.The fluorine-containing polymer / conductive fiber dielectric material is formed by mixing conductive fiber and a fluorine-containing polymer cPVDF material.The conductive fiber is polymer fiber with the surface coated with silver.The preparation method of the conductive fiber comprises the steps that the polymer fiber is placed in a dopamine alkaline aqueous solution to be soaked for a period of time, then taken out to react in air for a period of time, subjected to the soaking-autopolymerization reaction repeatedly and repeatedly lifted and pulled, washed with deionized water and dried to obtain the polydopamine modified fiber; the surface of the polydopamine modified fiber is coated with a layer of silver through a chemical silvering method; finally, the obtained fiber is thoroughly washed with distilled water, and dried in a vacuum drying box to obtain the conductive fiber.The conductive fiber is used as a filler and mixed with fluorine-containing polymer cPVDF; due to the fact that the surface layer of the conductive fiber is the conductive material, the dielectric constant of the composite material can be improved, dielectric loss will not be greatly increased when the dielectric constant is increased, the dielectric property is excellent, and the using range is wide.

Description

technical field [0001] The invention relates to a polymer / conductive fiber composite material with excellent dielectric properties prepared by chemical silver plating and polymer molding processing technology, and the technology can be used to prepare flexible films, wires and sheets. Background technique [0002] With the urgent need for miniaturization and functional diversification of devices in modern life and technological progress, it is imperative to develop integrated, light-weight, high-stability materials with high energy storage density. As a very important energy storage material, capacitor has the function of storing charge, and is widely used in various fields such as electronic information, digital home appliances, and aerospace. The dielectric material is an important part of the capacitor, and the performance of the dielectric material determines the energy storage capacity of the capacitor to a large extent. [0003] Traditional dielectric materials includ...

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Problems solved by technology

[0005] However, the compatibility of inorganic conductive fillers with organic polymers is generally poor, which leads to problems such as high dielectric constant and high dielectric loss in the composite materials usually obtained by the above method, which are easy to accelerate the dielectric loss. Thermal decomposition and aging greatly reduce its insulating properties, thereby affecting the practical application of polymer-based dielectric composites

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