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Method for preparing composite wave-absorbing material, and composite wave-absorbing material prepared by using same

A composite wave absorbing material and composite material technology are applied in the field of composite wave absorbing materials and the preparation of composite wave absorbing materials, which can solve the problems of poor weather resistance, easy agglomeration, and narrow absorbing frequency band, and achieve optimized wave absorbing performance, stable reaction, The effect of increasing the amount of absorption

Active Publication Date: 2020-04-10
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention is easy to operate and is convenient for large-scale production; the obtained composite wave-absorbing material can not only overcome the shortcomings of single ferromagnetic material such as high density, easy agglomeration, narrow wave-absorbing frequency band and poor weather resistance, but also has light weight, corrosion resistance, good The mechanical and absorbing properties of

Method used

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  • Method for preparing composite wave-absorbing material, and composite wave-absorbing material prepared by using same
  • Method for preparing composite wave-absorbing material, and composite wave-absorbing material prepared by using same
  • Method for preparing composite wave-absorbing material, and composite wave-absorbing material prepared by using same

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Embodiment

[0043] Preparation of nickel submicron spheres

[0044] NiCl 2 ·6H 2 O (1.2g), sodium acetate (3.0g) and trisodium citrate dihydrate (0.2g) were dispersed in a mixed solution of glycerol (30mL) and distilled water (10mL); after stirring for 1.5h, a uniform suspension Transfer to a stainless steel autoclave lined with Teflon; Dissolve sodium hydroxide NaOH (1.6g) and sodium hypophosphite monohydrate NaH in 20mL of distilled water 2 PO 2 ·H 2 O (3.2g) was slowly poured into the autoclave, and after reacting at 140°C for 15 hours, the solution was cooled to room temperature. The resulting gray precipitate was washed several times with distilled water and absolute ethanol, collected with a magnet, and finally dried under vacuum at 60°C for 12 hours to obtain the product nickel submicron spheres. The SEM image of the obtained nickel submicron spheres is shown in figure 1 It can be seen that the nickel submicron spheres are uniformly dispersed.

[0045] Preparation of phenolic resin pyr...

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Abstract

The invention relates to a method for preparing a composite wave-absorbing material, and the composite wave-absorbing material prepared by using the same. The method is simple to operate and convenient for large-scale production; the obtained composite wave-absorbing material not only can overcome the defects of high density, easy agglomeration, narrow wave-absorbing frequency band and poor weather resistance of a single ferromagnetic material, but also has the advantages of light weight, corrosion resistance and good mechanical and wave-absorbing properties. The method comprises the followingsteps: I, synthesizing nickel submicron spheres by adopting a hydrothermal technology; II, preparing a phenolic resin pyrolytic carbon coated nickel submicron sphere composite material from the nickel submicron spheres obtained in step I by adopting an aldehyde resin pyrolytic carbon technology; and III, preparing the phenolic resin pyrolytic carbon coated nickel submicron sphere and polyvinylidene fluoride composite material from the phenolic resin pyrolytic carbon coated nickel submicron sphere composite material obtained in step II by adopting an ultrasonic technology.

Description

Technical field [0001] The invention relates to a method for preparing a composite wave absorbing material. The method includes hydrothermal synthesis of nickel submicron spheres. The invention also relates to a composite wave absorbing material prepared by the method. The material is a phenolic resin pyrolytic carbon-coated nickel submicron sphere with a core-shell structure, Ni@C and polyvinylidene fluoride PVDF. PVDF. The invention belongs to the technical field of nano materials. Background technique [0002] In recent years, with the continuous advancement of electronic technology, the application of various electronic devices has brought us convenience and electromagnetic radiation hazards. Electromagnetic waves will interfere with each other in space, causing damage to the communication system, control failure, and unsmooth communication. With the increasing demand for green life, electromagnetic radiation hazards have gradually attracted people's attention, and after w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K7/18C08J5/18
CPCC08J5/18C08J2327/16C08K7/18C08K9/10C08L27/16
Inventor 王广胜沈讯杨树豪王慧雅
Owner BEIHANG UNIV
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