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Method for preparing core-shell type barium titanate/polyaniline composite wave-absorbing material

A composite wave-absorbing material, barium titanate technology, applied in the field of wave-absorbing materials, can solve the problems of unstudied BaTiO3/PANI composite material wave-absorbing performance, large particle size, etc., to improve broadband wave-absorbing performance and broaden the application field Effect

Inactive Publication Date: 2012-11-14
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reported BaTiO 3 / PANI composites generally have larger particle sizes, and the previous two reports did not study BaTiO 3 / The absorbing performance of PANI composite materials, although the third report mentioned BaTiO 3 / PANI composite material absorbing performance, but its reflectivity in the range of 0 ~ 6GHz is almost 0

Method used

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  • Method for preparing core-shell type barium titanate/polyaniline composite wave-absorbing material
  • Method for preparing core-shell type barium titanate/polyaniline composite wave-absorbing material
  • Method for preparing core-shell type barium titanate/polyaniline composite wave-absorbing material

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Experimental program
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Effect test

Embodiment 1

[0030] 1. Nano-BaTiO 3 preparation of

[0031] Weigh 2.13g barium acetate (Ba(CH 3 COO) 2 ) was dissolved in 7ml of distilled water at 50°C, and after it was completely dissolved, it was cooled to room temperature to obtain liquid A; 2.87g of tetrabutyl titanate (C 16 h 36 o 4 Ti) was dissolved in 5ml of absolute ethanol, stirred on a magnetic stirrer for 30min, and mixed evenly to obtain liquid B; add 3ml of glacial acetic acid dropwise to liquid B, then add liquid A dropwise, and place at 40 °C on a magnetic stirrer, stirring for 1 h to form a gel. After the gel was aged at room temperature for 3 hours, it was dried in a constant temperature dryer at 80° C. to obtain a dry gel. Finally, the xerogel was calcined in a muffle furnace at 800 °C for 2 h to obtain BaTiO 3 Powder, its XRD sees figure 1 a, TEM see figure 2 a.

[0032] 2. Barium titanate / polyaniline (BaTiO 3 / PANI) composites

[0033] Take 5g BaTiO 3 Disperse in 5mL distilled water, add 0.25g KH560 1%...

Embodiment 2

[0037] Take 12.3g BaTiO 3 Disperse in 5mL distilled water, add 1% coupling agent alcohol aqueous solution prepared with 0.24g KH570 at one time, after stirring for 40min, slowly add 12ml aniline hydrochloric acid solution dropwise (6ml aniline is dissolved in 6ml 1.5mol / L hydrochloric acid) After the dropwise addition, place in an ice-water bath, stir for 40 minutes, cool the reaction temperature to about 0°C, and dropwise add ammonium persulfate hydrochloric acid solution (15.08g ammonium persulfate dissolved in 24ml 1.5mol / L hydrochloric acid), after reacting for 7 hours, filter with suction, wash 3 times with 1.5mol / L hydrochloric acid, wash with a large amount of distilled water until the filtrate pH=6, dry at 70°C for 24 hours, and grind to obtain BaTiO 3 / PANI Composite. Its absorption curve is shown in image 3 c.

Embodiment 3

[0039] Take 12.3g BaTiO 3 Disperse in 7.5mL distilled water, add 1% coupling agent alcohol aqueous solution prepared with 0.21g KH560 at one time, after stirring for 40min, slowly add 6ml aniline hydrochloric acid solution dropwise (3ml aniline dissolved in 3ml 1.3mol / L hydrochloric acid ), after the dropwise addition, place in an ice-water bath, stir for 40 minutes, cool the reaction temperature to about 0°C, and add ammonium persulfate hydrochloric acid solution dropwise at a rate of 10 s / drop (7.54g ammonium persulfate dissolved in 12ml 1.3mol / L hydrochloric acid), after reacting for 7 hours, filter with suction, wash 3 times with 1.3mol / L hydrochloric acid, wash with a large amount of distilled water until the filtrate pH=6, dry at 80°C for 24 hours, and grind to obtain BaTiO 3 / PANI Composite. Its XRD see figure 1 b, TEM see figure 2 b, the absorption curve see image 3 d.

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Abstract

The invention discloses a method for preparing a core-shell type barium titanate / polyaniline composite wave-absorbing material. The method comprises the following steps of: adding an alcohol / water solution of a silane coupling agent into water dispersing agent of a nanometer barium titanate powder body; slowly dipping a hydrochloric acid solution of phenylamine; and finally dipping a hydrochloric acid solution of ammonium persulfate, and reacting to prepare the core-shell type barium titanate / polyaniline composite wave-absorbing material. Surface finishing on the nanometer barium titanate powder body is performed by using the silane coupling agent, so that polyaniline forms a good covering layer on the surface of barium titanate; and the prepared core-shell type barium titanate / polyaniline composite material has dielectric loss and magnetic loss; and because of specific magnetoelectric effect of the core-shell structure, the wide frequency wave-absorption performance of the material is obviously improved; the maximum reflectivity of the material is minus14.5dB in the range of 0-6GHz and is superior to minus 5dB and minus10dB; and the bandwidths are 1,200MHz and 750MHz respectively.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a preparation method of a core-shell type composite wave-absorbing material with wave-absorbing performance in a low frequency band. Background technique [0002] The rapid development of modern science and technology, especially the harm caused by electromagnetic waves to the environment and the use of the 4th generation "stealth" fighter jets in actual combat, has led to electromagnetic compatibility, electromagnetic shielding and microwave absorption technologies that have increasingly attracted great attention from material researchers. Traditional microwave absorbing materials mainly include materials such as metals and ferrites. They have good mechanical properties and microwave absorbing properties, but their disadvantages are high density and easy corrosion. [0003] Studies by Abbas and others have shown that conductive polyaniline (PANI) has the characteristics of light weig...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K9/06C08K3/24C08L79/02
Inventor 景红霞李巧玲叶云杨晓峰郭志武
Owner ZHONGBEI UNIV
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