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MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as preparation method and application thereof

A wave-absorbing material, manganese ferrite technology, applied in the field of MOFs derivative double-coated manganese ferrite wave-absorbing material and its preparation, can solve the problem of difficult to achieve effective absorption of electromagnetic waves, poor mechanical properties, corrosion resistance Poor performance and other problems, achieve good chemical stability and composite characteristics, increase the complex dielectric constant, and broaden the absorption frequency band

Pending Publication Date: 2022-05-13
江西虔悦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when ferrite is used alone, its disadvantages such as high density, poor corrosion resistance, and poor mechanical properties limit its application as a wave-absorbing material.
It is often difficult for single-component absorbing materials to achieve effective absorption of electromagnetic waves.

Method used

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  • MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as preparation method and application thereof
  • MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as preparation method and application thereof
  • MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: ZIF-8 (the unit molecular formula of ZIF-8 is C 8 h 10 N 4 Preparation of Zn) derivative double-layer coated manganese ferrite absorbing material:

[0041] (1) Formulation:

[0042] 85wt.%MnFe 2 o 4 , 15wt.% ZIF-8 (wt.% is mass percentage)

[0043] (2) Preparation process:

[0044] Step 1, 3.60 g FeCl 3 ·6H 2 O and 1.32 g MnCl 2 4H 2 O is fully dissolved in 160ml of ethylene glycol, stirred evenly at room temperature to form a solution A; add 14.4g sodium acetate and 4.0 g polyethylene glycol to the A solution to form a B solution, and use HJ-6 magnetic heating and stirring Stir for 30 minutes; transfer solution B to 100ml polytetrafluoroethylene lining, then put the polytetrafluoroethylene lining with solution B into a stainless steel reaction kettle, tighten the seal, and place it in an oven for hydrothermal reaction , the reaction temperature is 200° C., and the time is 12 hours. Cool down to the greenhouse with the furnace, and centrifuge a...

Embodiment 2

[0048] Embodiment 2: ZIF-8 (the unit molecular formula of ZIF-8 is C 8 h 10 N 4 Preparation of Zn) derivative double-layer coated manganese ferrite absorbing material:

[0049] (1) Formulation:

[0050] 80wt.%MnFe 2 o 4 , 20wt.% ZIF-8 (wt.% is mass percentage)

[0051] (2) Preparation process:

[0052] The difference between embodiment 2 and embodiment 1 is that the Zn(NO 3 ) 2 ·6H 2 O was adjusted to 0.65g, dimethylimidazole was adjusted to 1.08g, and other steps were the same as in Example 1.

Embodiment 3

[0053] Embodiment 3: ZIF-67 (the unit molecular formula of ZIF-67 is C 4 h 6 N 2 Preparation of Co) derivative double-layer coated manganese ferrite absorbing material:

[0054] (1) Formulation:

[0055] 85wt.%MnFe 2 o 4 , 15wt.% ZIF-67 (wt.% is mass percentage)

[0056] (2) Preparation process:

[0057] The difference between Example 3 and Example 1 is that the metal organic framework material prepared in this example is ZIF-67, and the unit molecular formula is C 4 h 6 N 2 Co, in step 3, Zn(NO 3 ) 2 ·6H 2 O was replaced by Co(NO 3 ) 2 ·6H 2 O, quality is 0.45g, other steps are all identical with embodiment 1.

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Abstract

The invention relates to an MOFs derivative double-layer coated manganese ferrite wave-absorbing material as well as a preparation method and application thereof. The double-layer coated manganese ferrite wave-absorbing material provided by the invention takes manganese ferrite as a core, the middle is ferrous oxide or cobalt oxide, and the outer layer is carbon. The double-layer core-shell structure of the wave-absorbing material improves interface polarization and dipole polarization, increases the complex dielectric constant of the material, enhances the interface scattering of the multilevel structure, and optimizes the impedance matching of the composite material. According to the embodiment 1, the minimum RL value of the obtained double-layer coated manganese ferrite wave-absorbing material at the frequency of 11.6 GHz is-71.65 dB, and the minimum RL value of the manganese ferrite wave-absorbing material without double-layer coating at the frequency of 13.22 GHz is-37.53 dB. Therefore, the MOFs derivative double-layer coated manganese ferrite wave-absorbing material prepared by the method can effectively absorb electromagnetic waves at a low thickness, and has good chemical stability.

Description

technical field [0001] The present invention relates to ferrite wave-absorbing material technology, specifically a kind of MOFs derivative double-coated manganese ferrite wave-absorbing material and its preparation method and application. Background technique [0002] With the development of science and technology, more and more electronic components and electrical equipment are pouring into people's lives, and then electromagnetic waves of various frequency bands are flooding our living space, which inevitably causes certain damage to the human body. degree of harm. A large number of research results have shown that the damage caused by electromagnetic radiation to organisms has a cumulative effect, and long-term exposure to electromagnetic radiation is likely to induce pathological changes. In addition, the national defense industry is also an important application field of absorbing materials. For example, coating absorbing materials on military equipment such as aircraf...

Claims

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Application Information

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IPC IPC(8): C01G51/04C01G49/04C01G49/00C01B32/15B82Y40/00B82Y30/00H05K9/00
CPCC01G51/04C01G49/04C01G49/0072C01B32/15B82Y40/00B82Y30/00H05K9/0081C01P2004/80C01P2006/40C01P2006/42
Inventor 王磊龙凤兰张文淼梁彤祥邹海平肖云黎德丽
Owner 江西虔悦新材料有限公司
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