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A polyaniline/epoxy resin wave-absorbing composite material and its preparation method

A technology of epoxy resin and composite materials, which is applied in the field of electromagnetic wave-absorbing materials, can solve the problems of large matching thickness, narrow absorption frequency band, and narrow wave-absorbing frequency band, and achieve strong electromagnetic wave absorption, broaden the wave-absorbing frequency band, and improve wave-absorbing performance effect

Active Publication Date: 2018-09-18
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional absorbing materials mainly aim at strong absorption tails, which have disadvantages such as narrow absorption frequency band and high density; new absorbing materials require "thin, light, wide, and strong". Conductive polymers as new wave-absorbing materials have become research hotspots
[0004] Among them, polyaniline (PAni) is a common dielectric loss conductive polymer, which has the advantages of diverse structures, low density, simple synthesis, and good environmental stability, but its absorption frequency band is narrow and the matching thickness is large; carbonyl iron It is a magnetic metal that has excellent attenuation properties for electromagnetic waves in the high frequency range, but has a high density

Method used

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  • A polyaniline/epoxy resin wave-absorbing composite material and its preparation method
  • A polyaniline/epoxy resin wave-absorbing composite material and its preparation method
  • A polyaniline/epoxy resin wave-absorbing composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of polyaniline:

[0035] Dissolve 100mol of ammonium persulfate into 200L of 0.05mol / L hydrochloric acid solution, slowly keep in the solution for 3 to 5 seconds and add a drop of aniline monomer Ai dropwise, (the molar ratio of aniline monomer to ammonium persulfate is 1.1:1 ), reacted at -5°C for 12 hours, washed with deionized water after the reaction, and dried in vacuum at 60°C; dissolved the polyaniline prepared above in 1mol / L hydrochloric acid solution for secondary doping, and stirred overnight , after standing and separating, vacuum-dry at 60°C, grind into powder with a ball mill and set aside;

[0036] (2) Preparation of polyaniline / epoxy resin wave-absorbing composite material:

[0037] Add 100 parts of polyaniline, 5 parts of carbonyl iron powder, and 5 parts of aluminum-doped zinc oxide into 100 parts of epoxy resin respectively, mechanically stir at room temperature, after mixing evenly, add 10 parts of dicyandiamide, and further ultrason...

Embodiment 2

[0039] (1) Preparation of polyaniline:

[0040] Dissolve 100mol of ammonium persulfate into 200L of 0.08mol / L hydrochloric acid solution, and slowly add aniline monomer Ai dropwise into the solution (the molar ratio of aniline monomer to ammonium persulfate is 1.1:1), at -3°C After the reaction was completed, it was washed with deionized water and dried in vacuum at 65°C; the polyaniline prepared above was dissolved in 1mol / L hydrochloric acid solution for secondary doping, stirred overnight, and then separated by standing. Vacuum dry at 65°C, grind into powder with a ball mill and set aside;

[0041] (2) Preparation of polyaniline / epoxy resin wave-absorbing composite material:

[0042] Add 100 parts of polyaniline, 8 parts of carbonyl iron powder, and 8 parts of aluminum-doped oxidation into epoxy resin in a certain proportion, mechanically stir at room temperature, after mixing evenly, add 15 parts of ethylenediamine, further ultrasonic for 5 to 15 minutes, and then pour in...

Embodiment 3

[0044] (1) Preparation of polyaniline:

[0045] Dissolve 100mol of ammonium persulfate into 200L of 0.1mol / L hydrochloric acid solution, slowly add aniline monomer Ai dropwise in the solution (the molar ratio of aniline monomer to ammonium persulfate is 1.1:1), at -1°C After the reaction was completed, it was washed with deionized water and dried in vacuum at 70°C; the polyaniline prepared above was dissolved in 1mol / L hydrochloric acid solution for secondary doping, stirred overnight, and then separated by standing. Vacuum-dried at 70°C, pulverized with a ball mill for later use;

[0046] (2) Preparation of polyaniline / epoxy resin wave-absorbing composite material:

[0047] Add 100 parts of polyaniline, 11 parts of carbonyl iron powder, and 11 parts of aluminum-doped zinc oxide into epoxy resin in a certain proportion, mechanically stir at room temperature, after mixing evenly, add 20 parts of ethylenediamine, and then pour into After being cured at 60-80°C in the mold, the...

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Abstract

The invention relates to a polyaniline / epoxy resin composite material and a preparation method thereof, belonging to the field of an electromagnetic wave-absorbing material. The polyaniline / epoxy resin composite material is prepared from the following components by weight: 100 parts of epoxy resin, 100 parts of polyaniline, 5 to 30 parts of magnetic filler, 5 to 30 parts of metal-doped oxide and 10 to 40 parts of a curing agent. Compared with the prior art, the invention has the following advantages: in situ polymerization is utilized to prepare polyaniline and secondary doping of polyaniline is carried out, so polyaniline is allowed to achieve conductivity with a best wave-absorbing property, and overall wave-absorbing property of the composite material is improved; dielectric-loss type polyaniline composites with magnetic-loss type carbonyl iron, so the wave-absorbing material with good dielectric loss and magnetic loss is obtained, and high-frequency wave-absorbing performance of the material is increased.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave-absorbing materials, and relates to a polyaniline / epoxy resin composite material and a preparation method thereof. Background technique [0002] With the development of science and technology and the continuous development of industrial civilization, electromagnetic pollution generated by more and more electronic and electrical equipment and communication systems has penetrated into every corner of life, seriously affecting people's physical and mental health. Therefore, how to effectively prevent and eliminate electromagnetic radiation and interference has become an important issue in the development of science and technology. [0003] Electromagnetic absorbing material refers to a material that can absorb electromagnetic wave energy projected onto its surface, and convert electromagnetic wave energy into heat or other forms of energy through the dielectric loss of the material. Traditional a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/02C08L79/02C08K7/18C08K3/22C08K3/18C08G73/02
Inventor 杨桂生姚寅芳
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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