▎ 摘　　要

NOVELTY - Composite resistive film with adjustable dielectric constant, comprises carbon black, carbon nanofiber, graphene, dispersant, adhesive, solvent and thickener, where the particle size of the carbon black is 35-45 nanometer. The average diameter of the carbon nanofibers is 8-10 nm, the length is 8-12 microns, and the mass ratio of the carbon nanofibers is 1-5: 60. The average diameter of the graphene is 1-5 microns, the thickness is 100-200 nanometer and the mass ratio of the composite resistive film is 1-5:60. The dispersant is sodium lauryl sulfate SDS, sodium dodecylbenzenesulfonate SDBS or water-based wetting dispersant BYK-190. The adhesive is water-based and accounts for 20-25: 40 of the mass ratio of the composite resistive film. The solvent is deionized water. The thickener is methyl cellulose mc, sodium carboxymethyl cellulose or hydroxyethyl cellulose. USE - Composite resistive film with adjustable dielectric constant. ADVANTAGE - The composite resistive film has low density, corrosion resistance, good toughness, and adjustable parameters, high strength, good toughness, good optical characteristics and electrical and thermal conductivity, and is simple and convenient. DETAILED DESCRIPTION - Composite resistive film with adjustable dielectric constant, comprises carbon black, carbon nanofiber, graphene, dispersant, adhesive, solvent and thickener, where the particle size of the carbon black is 35-45 nanometer. The average diameter of the carbon nanofibers is 8-10 nm, the length is 8-12 microns, and the mass ratio of the carbon nanofibers is 1-5: 60. The average diameter of the graphene is 1-5 microns, the thickness is 100-200 nanometer and the mass ratio of the composite resistive film is 1-5:60. The dispersant is sodium lauryl sulfate SDS, sodium dodecylbenzenesulfonate SDBS or water-based wetting dispersant BYK-190. The adhesive is water-based and accounts for 20-25: 40 of the mass ratio of the composite resistive film. The solvent is deionized water. The thickener is methyl cellulose mc, sodium carboxymethyl cellulose or hydroxyethyl cellulose. The carbon nanofibers are dispersed between carbon black and graphene, and a continuous conductive network is formed, and the conductive network is carried in an aqueous adhesive at the frequency of 2-18 giga hertz, the control range of the real dielectric portion is 112.06-13.01, the control range of the dielectric imaginary portion is 115.97-11.27, and the control range of the resistivity is 18.464-80.381 ohm.cm. An INDEPENDENT CLAIM is included for a method for preparing composite resistive film, which involves: (A) adding carbon black, graphene, and dispersant to deionized water in proportion, and ball milling uniformly at room temperature To obtain a uniformly dispersed carbon black/graphene mixed dispersion; (B) adding carbon nanofibers and dispersants to the carbon black/graphene mixed dispersion, and mechanically stirring and ultrasonically shaking at room temperature to obtain dispersed dispersion solution of carbon black/graphene/carbon nanofibers; (C) adding adhesive to the carbon black/graphene/carbon nanofiber mixed dispersion solution and mechanically stirring at room temperature to obtain a carbon black/graphene/carbon nanofiber mixed resin slurry material; (D) adding thickener to the carbon black/graphene/carbon nanofiber mixed resin slurry and mechanically stir at room temperature; and (E) applying composite slurry on the substrate uniformly, and drying it at room temperature in a vacuum oven at 60-70 degrees C.