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Preparation method of lanthanum-doped barium ferrite-polyaniline composite material microwave absorbent

A microwave absorber, barium ferrite technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of not having magnetic loss characteristics, etc.

Active Publication Date: 2011-08-31
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have shown that: at microwave frequencies, polyaniline as a microwave absorber mainly exhibits electrical loss characteristics and does not have magnetic loss characteristics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Add quantitative amounts of ferric nitrate, barium nitrate and lanthanum nitrate (0.05 molar content) into deionized water and stir until dissolved. Add the citric acid in the metered ratio, mix well and add an appropriate amount of polyethylene glycol. Heat and stir in a water bath at about 80°C until a viscous wet gel is formed. The wet gel was dried in a vacuum oven at 120°C until the water evaporated completely. Calcined at 1000°C for 3 hours after grinding to obtain black barium ferrite.

[0021] Step 2: Add doped ferrite into 1.5mol / L hydrochloric acid solution, ultrasonically oscillate for 0.5h to disperse them evenly, then slowly add the analytically pure aniline monomer into doped barium ferrite hydrochloric acid suspension, while stirring for about 10min. The suspension was transferred to an ice-water bath, and persulfuric acid was added dropwise within 0.5 h, and the system was maintained in the ice-water bath for 6 h. After the reaction is comple...

Embodiment 2

[0023] Step 1: Add quantitative amounts of ferric nitrate, barium nitrate and lanthanum nitrate (0.10 molar content) into deionized water and stir until dissolved. Add the citric acid in the metered ratio, mix well and add an appropriate amount of polyethylene glycol. Heat and stir in a water bath at about 80°C until a viscous wet gel is formed. The wet gel was dried in a vacuum oven at 120°C until the water evaporated completely. Calcined at 1000°C for 3 hours after grinding to obtain black barium ferrite.

[0024] Step 2: Add doped ferrite into 1.5mol / L hydrochloric acid solution, ultrasonically oscillate for 0.5h to disperse them evenly, then slowly add the analytically pure aniline monomer into doped barium ferrite hydrochloric acid suspension, while stirring for about 10min. The suspension was transferred to an ice-water bath, and persulfuric acid was added dropwise within 0.5 h, and the system was maintained in the ice-water bath for 6 h. After the reaction is comple...

Embodiment 3

[0026] Step 1: Add quantitative amounts of ferric nitrate, barium nitrate and lanthanum nitrate (0.15 molar content) into deionized water and stir until dissolved. Add the citric acid in the metered ratio, mix well and add an appropriate amount of polyethylene glycol. Heat and stir in a water bath at about 80°C until a viscous wet gel is formed. The wet gel was dried in a vacuum oven at 120°C until the water evaporated completely. Calcined at 1000°C for 3 hours after grinding to obtain black barium ferrite.

[0027] Step 2: Add doped ferrite into 1.5mol / L hydrochloric acid solution, ultrasonically oscillate for 0.5h to disperse them evenly, then slowly add the analytically pure aniline monomer into doped barium ferrite hydrochloric acid suspension, while stirring for about 10min. The suspension was transferred to an ice-water bath, and persulfuric acid was added dropwise within 0.5 h, and the system was kept in the ice-water bath for 6 h. After the reaction is completed, f...

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PUM

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Abstract

The invention relates to a preparation method of a lanthanum-doped barium ferrite-polyaniline composite material microwave absorbent. Lanthanum-doped barium ferrite is prepared from nitrate of barium, ferrum and lanthanum and an aniline monomer which serve as main raw materials by a sol gel-self-propagating method; and a lanthanum-doped barium ferrite-polyaniline composite is prepared by an in-situ chemical oxidation method. Due to organic composition of the lanthanum-doped barium ferrite and the polyaniline, advantages of the two components can be maintained; electromagnetic parameters of a material can be cut; microwave absorption frequency band is widened; the material density is reduced; absorption efficiency is improved; comprehensive properties are improved; the problems of high thickness, heavy weight, narrow frequency band, low absorbability and the like of the single ferrite wave-absorbing material are solved; thin, light, wide and strong requirements of a wave-absorbing coating are met; and the lanthanum-doped barium ferrite-polyaniline composite material microwave absorbent is an ideal and high-performance microwave absorbent.

Description

technical field [0001] The invention relates to a microwave absorbing material and a preparation method thereof, in particular to a preparation method of a lanthanum-doped barium ferrite-polyaniline composite material microwave absorber. Background technique [0002] Electromagnetic Wave Absorbing Materials (Electromagnetic Wave Absorbing Materials) refer to the materials that can guide the electromagnetic wave incident on its surface from the outside to enter it to the maximum extent, and can convert the energy of the electromagnetic wave into other forms of energy to dissipate, attenuate or absorb the energy of the electromagnetic wave, thereby A class of functional materials that achieve the purpose of reducing or eliminating electromagnetic wave reflection. Broadly speaking, it includes anti-electromagnetic interference materials (EMI) and microwave absorbing materials (RAM), and even includes a wide range of fields from acoustic wave to infrared absorbing materials, and...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K3/22C09K3/00
Inventor 谢宇张炜平魏娅洪小伟余远福杨海丹黄启飞江鸢飞侯晓宾
Owner NANCHANG HANGKONG UNIVERSITY
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