Preparation method of polyvinylidene fluoride composite material with high dielectric constant and low dielectric loss

Abstract

A kind of preparation method of polyvinylidene fluoride composite material with high dielectric constant and low dielectric loss, the steps are: A, graphene oxide N, N-dimethylformamide solution preparation: the aqueous solution of graphene oxide and N , N-dimethylformamide is mixed and rotated under reduced pressure, and the distillate is ultrasonically treated; B, preparation of graphene oxide / silicon dioxide nano-hybrid material: get nano-silicon dioxide and add it to the graphene oxide of step A N,N-dimethylformamide solution, mechanical stirring and ultrasonic treatment, to obtain a suspension; C, preparation of polyvinylidene fluoride composite material: polyvinylidene fluoride is added to N,N-dimethylformamide In formamide, stir, while raising the temperature to 45-55°C; add the suspension prepared in step B, then stir and ultrasonically treat the mixture, heat the mixture to obtain a viscous liquid, and then dry the viscous liquid to obtain a dried product , and finally use a micro-twin-screw extruder to carry out melt blending, that is. The prepared product has high dielectric constant, low dielectric loss and good mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of dielectric polymer composite materials. Background technique [0002] Polyvinylidene fluoride is a linear high polymer obtained by the polymerization of monomer 1,1-vinylidene fluoride. It has the characteristics of fluorine-containing resins and general-purpose resins. In addition to high tensile strength and impact strength, excellent toughness And wear resistance, as well as excellent heat resistance, chemical corrosion resistance and aging resistance, also has excellent ferroelectricity, piezoelectricity, dielectricity, pyroelectricity and other special properties, widely used in petrochemical, Fluorocarbon coatings, electronics and electrical fields. In the field of electronics and electricity, polyvinylidene fluoride is often selected as the matrix material, and organic or inorganic conductive fillers or ceramic materials with high dielectric constants are introduced into the matrix ...

AI Technical Summary

Problems solved by technology

The addition of conductive fillers can form more and denser polarized dielectric interfaces in the polyvinylidene fluoride matrix, and the dielectric constant increases. However, as the content of conductive fillers increases, the dielectric interfaces will be conducted, which will bring dielectric A sharp increase in electrical losses

Although the addition of ceramic materials can improve the dielectric properties of the material, the addition of a large amount of brittle ceramic materials will lead to a decrease in the mechanical properties and processing properties of the material.

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