Fluorine-containing polymer-based dielectric composite film and preparation method thereof

Abstract

The invention discloses a fluorine-containing polymer-based dielectric composite film. The dielectric composite film is prepared from conductive metal powder, calcium copper titanate, rubber particles and fluorine-containing polymer as raw materials in the presence of a compound liquid of N, N-dimethyl acetamide and polyacrylic acid as a solvent, wherein the mass ratio of components is (0-2.5): (10-30): (0-3): 10. The invention also discloses a preparation method of the composite film. The fluorine-containing polymer-based dielectric composite film is a dielectric composite film which has the advantages of high dielectric constant, high compressive strength, low dielectric loss and excellent elongation and controllable thickness.

Description

technical field [0001] The invention relates to the field of dielectric composite materials, in particular to a fluorine-containing polymer-based dielectric 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 light weight and high energy storage density while being small in size, it is key to develop dielectric films with low density, high dielectric constant and high withstand voltage as dielectric materials. Traditional organic thin film dielectric materials are mostly polymer single-phase materials, and the general dielectric constant is between 1 and 3, which makes the capacitors produced by them have low capacitance density and cannot meet the needs of industry development. Although the ceramic material has a relatively high dielectric constant, its processing performance is p...

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Problems solved by technology

At present, there are mainly two ways to obtain this type of composite dielectric material: one, such as the Chinese patent CN102558718B, fills the polymer with ceramic particles with a high dielectric constant to prepare a ceramic / polymer two-phase composite, but in order to obtain a high The dielectric constant and the filling amount of ceramics are very high, which makes it difficult for composite materials to be processed into thin films; another kind such as CN1322052A, CN101423645B and CN102627781B is based on the percolation effect, and simultaneously fills conductive particles and ceramics in the polymer to prepare conductive Particle / ceramic / polymer three-phase composite, but the dielectric loss of the obtained composite is relatively large

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