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Preparation method of NiCoZn ferrite-SiO2/DBSA-doped polypyrrole composite wave-absorbing material

A composite wave-absorbing material and composite material technology, applied in the field of electromagnetic wave absorbing material preparation, can solve the problems of low saturation magnetization and low electrical conductivity, and achieve the effect of large grain size, enhanced electrical conductivity, and broadened absorption frequency band width

Inactive Publication Date: 2014-08-27
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to provide a kind of NiCoZn ferrite-SiO 2 The preparation method of DBSA-doped polypyrrole microwave absorber can overcome the shortcomings of ferrite / conductive polymer microwave absorber materials prepared at the present stage, such as low saturation magnetization and low conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) According to the chemical element stoichiometric ratio is Ni 0.3 co 0.2 Zn 0.5 Fe 2 o 4 Weigh 0.87g Ni(NO 3 ) 2 ·6H 2 O, 0.58gCo(NO 3 ) 2 ·6H 2 O, 1.49g Zn(NO 3 ) 2 ·6H 2 O, 8.08g Fe(NO 3 ) 3 9H 2 O was dissolved in 35mL of absolute ethanol, in a constant temperature water bath at 60°C for 30min, according to the NiCoZn ferrite and SiO 2 Measure 1.10 mL of tetraethyl orthosilicate (TEOS) at a mass ratio of 7:3, and slowly add it dropwise to the above alcohol solution of nitrate, continue in a constant temperature water bath at 60°C until gel is formed, then vacuum dry at 80°C for 12 hours to form a dry gel , grind, hold at 950°C for 2h, and grind again to get NiCoZn ferrite-SiO 2 Composite powder.

[0019] (2) Add 0.75g NiCoZn ferrite-SiO 2 Add the composite powder into 25mL of absolute ethanol, ultrasonically disperse for 30min, add 2.0g of pyrrole monomer and 1.0g of DBSA dropwise into the above system respectively, stir for 10min with increased ...

Embodiment 2

[0021] NiCoZn Ferrite-SiO 2 The preparation method of the composite powder is the same as step (1) of Example 1. Weigh 2.00g NiCoZn Ferrite-SiO 2 Composite powder used to prepare NiCoZn ferrite-SiO 2 / DBSA doped polypyrrole composite material, its preparation method is the same as the step (2) of embodiment 1, obtains NiCoZn ferrite-SiO 2 / DBSA-doped polypyrrole composite (X=2.00). The prepared composite material has a frequency band width of 12.3 GHz in which the reflectivity loss value is lower than -10dB within 2-18GHz, and the minimum reflectivity loss value can reach -37dB.

Embodiment 3

[0023] NiCoZn Ferrite-SiO 2 The preparation method of the composite powder is the same as step (1) of Example 1. Weigh 4.50g NiCoZn ferrite-SiO 2 Composite powder used to prepare NiCoZn ferrite-SiO 2 / DBSA doped polypyrrole composite material, its preparation method is the same as the step (2) of embodiment 1, obtains NiCoZn ferrite-SiO 2 / DBSA-doped polypyrrole composite (X=4.50). The prepared composite material has a frequency bandwidth of 10.3GHz in which the reflectivity loss value is lower than -10dB within 2-18GHz, and the minimum reflectivity loss value can reach -37dB.

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Abstract

The invention provides a preparation method of a NiCoZn ferrite-SiO2 / DBSA-doped polypyrrole composite wave-absorbing material. According to the invention, nitrate, ethyl orthosilicate, anhydrous ethanol, and the like are adopted as raw materials; NiCoZn ferrite-SiO2 composite powder is prepared with a sol-gel method; the NiCoZn ferrite-SiO2 composite powder, dodecylbenzene sulfonic acid (DBSA), and pyrrole monomer are adopted as raw materials, and the NiCoZn ferrite-SiO2 / DBSA-doped polypyrrole composite material is prepared with an in-situ polymerization method. The composite material provided by the invention mainly overcomes problems such as weak wave absorbance, narrow band, high density, and high thickness of traditional wave-absorbing materials, and has important application values in fields such as stealth technology, electromagnetic shielding, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a NiCoZn ferrite-SiO 2 / DBSA-doped polypyrrole composite wave-absorbing material preparation method. Background technique [0002] The ferrite / conductive polymer microwave absorber prepared at this stage has some defects, such as low saturation magnetization and low electrical conductivity, etc. It is difficult to meet the requirements of microwave absorbing materials such as "absorbing frequency bandwidth, strong absorption strength, light density, and thickness". Thin" requirements. [0003] co 2+ As a commonly used additive in soft ferrite, it is often used in actual production. The sol-gel method has the characteristics of low preparation temperature, simple process and easy control of reaction conditions. It is widely used in ferrite preparation. As one of the most common conductive polymers, polypyrrole (PPy) has the characteristics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08K3/36C08K3/22C08K5/42
Inventor 谢宇刘锦梅凌云赵杰闫思凤石磊黄彦朱卫多余远福张凯赖强
Owner STATE GRID CORP OF CHINA
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