▎ 摘　　要

NOVELTY - Composite material comprises ethylene glycol, graphite oxide, ferric chloride, sodium acetate, and ethylenediamine, where the composite material is ferrite double complex dielectric material. USE - The composite material is useful in preparing coating structure (claimed). ADVANTAGE - The material has reinforced wave-absorbing property, suitable electrical properties, low density and good stability, functions of electromagnetic shielding and microwave absorption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: preparing composite material, comprising (i) measuring 150-200 ml ethylene glycol with measuring cylinder of 250 ml, adding 0.3-0.5 g graphite oxide in ethylene glycol and forming uniformly dispersed colloidal solution by sonicator, (ii) adding 3-5 g ferric chloride, 9-10 g sodium acetate and 30-40 g ethylenediamine to it again, stirring 30 minutes to obtain mixed solution, (iii) moving into reactor, (iv) reacting for 8 hours in electric heating blast drying oven at 200℃, naturally cooling to room temperature after completing reaction, (v) centrifugal washing, and repeatedly washing with absolute ethanol to remove impurities, (vi) drying at 60℃ in vacuum drying oven to obtain product i.e. 3-4 g ferric chloride, and (vii) adding 0.3-0.4 g ferric chloride and 1-2 g ferric chloride by controlling addition, and adding graphene to ferric chloride as contrast. use method of composite material, comprising (1) dispersing wave absorbing paint in binder of organic polymer material, and adding absorbent at the same time, and (2) processing by brushing or spraying, and often curing at high temperature to obtain coating structure.