A kind of composite absorbing material and preparation method thereof

Abstract

The invention discloses a composite wave-absorbing material, comprising main materials and auxiliary agents, wherein the main materials include a nanometer ferriferrous oxide particle and nanometer cellulose, the auxiliary agents include oleic acid and potassium persulphate, the mass percentage of the main materials in the wave-absorbing material is 60 to 85%, and the mass percentage of the auxiliary agents in the wave-absorbing material is 4 to 15%. A preparation method for the composite wave-absorbing material comprises the following steps: (1) preparing a nanometer cellulose solution; (2) adding potassium persulphate for a reaction; (3) adding oleic acid-coated nanometer ferriferrous oxide into a uniformly mixed solution obtained in the previous step; (4) allowing a mixed liquor obtained in the previous step to undergo a reaction at a temperature of 60 DEG C for 6 h, cooling to room temperature after completion of the reaction and transferring the reacted mixed liquor to a centrifuge tube for centrifugation; (5) adding purified water into a supernatant obtained in the previous step and carrying out centrifugation again; and (6) adding purified water into a precipitate obtained in the previous step, carrying out full mixing with stirring, carrying out centrifugation again and drying and grinding a precipitate obtained after centrifugation. Compared with a conventional wave-absorbing material, the wave-absorbing material provided by the invention has the advantages of low density, a wide absorption frequency band and enhanced wave-absorbing performance.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a composite wave-absorbing material and a preparation method thereof. Background technique [0002] The absorbing material is composed of two parts: the absorber and the matrix material. It is a kind of material that can absorb and attenuate the incident electromagnetic wave, and convert the electromagnetic energy into other forms of energy, such as mechanical energy, electrical energy and thermal energy, so as to consume the electromagnetic energy. A class of functional materials. A wave-absorbing material with excellent performance should meet two requirements at the same time: one is to allow the incident electromagnetic wave to enter the material to the maximum extent, and has wave impedance matching characteristics, even if the reflection coefficient of the incident electromagnetic wave on the surface of the material medium is the smallest; the other is to make th...

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Problems solved by technology

[0004] In order to solve the defects of the existing wave-absorbing materials, the present invention has developed a composite wave-absorbing material with a new composition and its preparation method, so as to realize the purpose of enhancing the wave-absorbing performance of the wave-absorbing material and having a smaller density than the existing wave-absorbing material