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A core-shell structure composite microwave absorbing material

A technology of microwave absorbing material and core-shell structure, applied in other chemical processes, chemical instruments and methods, electrical components, etc., can solve the problems of poor absorption in low frequency bands, narrow effective absorption bandwidth, poor processing performance, etc., and achieve excellent absorption effect , low cost, light weight effect

Active Publication Date: 2022-02-01
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of current microwave absorbing materials such as high density, narrow effective absorption bandwidth, and poor low-frequency absorption, the present invention discloses a MOF-derived core-shell structure nanoporous carbon@chiral poly-Schiff base iron salt composite microwave absorbing material. Synthetic method, further test the microwave absorption performance of the composite material, improve the shortcomings of traditional microwave absorbing materials such as high density, narrow effective absorption bandwidth, poor processability, and easy to be oxidized

Method used

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  • A core-shell structure composite microwave absorbing material
  • A core-shell structure composite microwave absorbing material
  • A core-shell structure composite microwave absorbing material

Examples

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Embodiment 1

[0031] Embodiment 1: a concrete implementation step of the present invention is as follows:

[0032] Step 1: Preparation of HKUST-1:

[0033] 1.8mmolCu(NO 3 ) 2 ·3H 2 O and 1.0mmol trimesic acid were dissolved in 12ml of ethanol and water mixed solution (the volume of ethanol and water was 1:1), the mixed solution was transferred to the reaction kettle, reacted at 120°C for 15h, and the obtained product was centrifuged , washed several times with deionized water and ethanol, and dried at 40°C to obtain HKUST-1;

[0034] Step 2: Preparation of nanoporous carbon:

[0035] Pre-prepared HKUST-1 in N 2 Pyrolysis under the atmosphere, the heating rate is 2°C / min, pyrolysis at 700°C for 2h to obtain copper / nanoporous carbon, put the copper / nanoporous carbon in 15% HF and stir for 8h, wash away the copper That is to obtain nanoporous carbon;

[0036] Step 3: Preparation of (1R,2R)-(-)-1,2-cyclohexanediamine ferrocene formaldehyde poly-Schiff base:

[0037] Take a 100ml flask, ...

Embodiment 2

[0043] Example 2: The difference between this example and specific example 1 is that the reaction temperature for preparing HKUST-1 in step 1 is 125°C, the reaction time is 16h, and the drying temperature is 50°C. In the second step, the concentration of HF is 20%, and the stirring time is 9h. The reaction temperature for preparing the Schiff base in step 3 is 55°C, the reaction time is 6.5 h, the drying temperature is 45°C, the amount of PVP added in step 4 is 0.06g, and the stirring time is 0.6h. After adding the poly-Schiff base, stir The time is 1.5h, the mass ratio of nanoporous carbon to chiral poly-Schiff base iron salt is 15:1, poly-Schiff base and FeSO 4 ·7H 2 The mass ratio of O was 2.5:1, the reaction time was 6.5 h, and the mass ratio of composite to paraffin wax substrate was 1:1.1. Others are the same as in Example 1.

Embodiment 3

[0044] Example 3: The difference between this example and specific example 1 is that the reaction temperature for preparing HKUST-1 in step 1 is 125°C, the reaction time is 17h, and the drying temperature is 60°C. In the second step, the concentration of HF is 25%, and the stirring time is 10 h. The reaction temperature for preparing Schiff base in step 3 is 60°C, the reaction time is 7h, the drying temperature is 50°C, the amount of PVP added in step 4 is 0.07g, the stirring time is 0.7h, and the stirring time after adding poly-Schiff base 1.5h, the mass ratio of nanoporous carbon to chiral poly-Schiff base iron salt is 10:1, poly-Schiff base and FeSO 4 ·7H 2 The mass ratio of O was 2.5:1, the reaction time was 7 h, and the mass ratio of composite to paraffin wax substrate was 1:1.2. Others are the same as in Example 1.

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Abstract

The invention discloses a method for preparing a MOF-derived core-shell structure nanoporous carbon@chiral poly-Schiff base iron salt composite microwave absorbing material, and relates to a method for preparing a composite microwave absorbing material. The present invention aims to solve the problems of complex preparation methods, harsh preparation conditions, high cost, high material density and poor low-frequency band absorption performance in the existing composite wave-absorbing materials, and provides a preparation method using HKUST-1 as a template. A method for core-shell structure nanoporous carbon@chiral poly-Schiff base iron salt composite absorbing materials. The microwave absorbing material prepared by the present invention has small density, light weight, good low-frequency absorption effect, wide effective absorption bandwidth, good physical and chemical properties and mechanical processing performance, simple preparation process and low cost, and is suitable for large-scale batches Production.

Description

technical field [0001] The invention relates to microwave absorbing material technology, in particular to a MOF-derived core-shell structure nanoporous carbon@chiral poly-Schiff base iron salt composite microwave absorbing material. Background technique [0002] The widespread use of electromagnetic waves has greatly promoted the development of human society, but it also brings various problems. Electromagnetic wave pollution not only adversely affects human health but also interferes with the normal operation of electronic equipment. At the same time, in the field of military industry, the electromagnetic stealth capability of weapons and equipment can greatly improve their combat capabilities, which will become the development trend of equipment. Therefore, microwave absorbing materials have broad application prospects. At present, microwave absorbing materials are developing in the direction of thin coating thickness, light weight, wide absorption bandwidth, and strong ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L91/06C08L79/00C08K7/24C09K3/00H05K9/00
CPCC08L91/06C09K3/00H05K9/0081C08K2201/011C08L79/00C08K7/24
Inventor 刘崇波彭华龙张祥李诗梦欧阳裕
Owner NANCHANG HANGKONG UNIVERSITY
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