Preparation method and application of lightweight porous wave-absorbing material

A wave-absorbing material and lightweight technology, applied in chemical instruments and methods, other chemical processes, electrical components, etc., can solve problems such as low refractive index, high porosity, and limited applications, and achieve high specific surface area and high porosity , low-cost effect

Inactive Publication Date: 2018-02-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fiber carbon airgel obtained by extracting the peel of a plant with a wide range of sources and low cost has the advantages of low airgel density, low refractive index, high porosity, and large specific surface area, and has excellent electrical loss. ability, the disadvantage is that carbon aerogels do not have electromagnetic loss properties
As a soft magnetic material widely used in industry, nickel ferrite has good superparamagnetism, good impedance matching and electromagnetic loss characteristics, but its high density and poor temperature stability limit its practical application. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of a lightweight porous wave-absorbing material, comprising the steps of:

[0024] Step a) Soak the banana peel in toluene for 3 hours, alternately wash it with ethanol and deionized water for 4 times, and crush the plant peel by mechanical crushing;

[0025] Step b) Add 200 mL of 0.5 mol / L sodium hydroxide solution per 100 g of the pretreated pericarp obtained in step a), heat in a water bath at 90°C for 7 hours, take it out and separate it by suction filtration, and wash the filter residue until Neutral, moist peel fiber;

[0026] Step c) The volume ratio of peel fiber and deionized water obtained in step b) is 1:1 to 1:3, mix deionized water and peel fiber evenly, and dry in a freeze dryer at -55°C for 35 hours , to obtain fiber aerogel; place the obtained fiber aerogel in a tube furnace, and under the protection of nitrogen, raise the temperature from room temperature to 400 °C for 2 hours at a heating rate of 6 °C / min, and then cool it down to...

Embodiment 2

[0029] A preparation method of a lightweight porous wave-absorbing material, comprising the steps of:

[0030] Step a) Soak the apple peel in chloroform for 2 hours, wash it four times alternately with ethanol and deionized water, and crush the peel of the plant by mechanical crushing;

[0031] Step b) Add 100 mL of potassium hydroxide solution with a concentration of 0.1 mol / L per 100 g of the pretreated pericarp obtained in step a), heat in a water bath at 100°C for 5 hours, take it out and separate it by suction filtration, and wash the filter residue until Neutral, moist peel fiber;

[0032] Step c) According to the volume ratio of peel fiber and deionized water obtained in step b), mix deionized water and peel fiber evenly, and dry at -55°C for 35 hours in a freeze dryer to obtain fiber gas Gel; the obtained fiber airgel is placed in a tube furnace, and under the protection of nitrogen, the temperature is raised from room temperature to 350 °C for 3 hours at a heating ra...

Embodiment 3

[0035] A preparation method of a lightweight porous wave-absorbing material, comprising the steps of:

[0036] Step a) Soak the banana peel in p-xylene for 5 hours, alternately wash it with ethanol and deionized water for 4 times, and crush the plant peel by mechanical crushing;

[0037] Step b) Add 200 mL of 1mol / L sodium hydroxide solution per 100 g of the pretreated pericarp obtained in step a), heat in a water bath at 100°C for 10 hours, take it out and separate it by suction filtration, and wash the filter residue to medium Sex, get moist peel fiber;

[0038] Step c) The volume ratio of peel fiber and deionized water obtained in step b) is 1:3, mix deionized water and peel fiber evenly, and dry at -55°C for 35 hours in a freeze dryer to obtain fiber gas Gel; place the obtained fiber airgel in a tube furnace, and under the protection of nitrogen, raise the temperature from room temperature to 400°C for 2 hours at a heating rate of 6°C / min, and then lower it to room temper...

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Abstract

The invention belongs to the technical field of preparation of composites and relates to the preparation of lightweight porous structural microwave-absorbing material, in particular to a preparation method of lightweight porous nickel ferrite/carbon aerogel wave-absorbing material, comprising: extracting fibers from waste pericarps, lyophilizing, carbonizing at high temperature to obtain carbon aerogel, subjecting the carbon aerogel to hydrothermal reaction with nickel ferrite nano crystal at 150-200 DEG C for 7-16 h, and compositing. The wave-absorbing material prepared herein features largespecific surface area, small density, large porosity, good conductivity and good magnetism at the premise of retaining nickel ferrite magnetic effect, is capable of greatly absorbing electromagnetic wave under wide frequency by means of resistance loss, electromagnetic loss, interfacial polarization loss and multi-step reflecting absorption, has a minimum reflection loss of -20 dB to -50 dB duringuse, and has effective wave-absorbing bandwidth of 2 dB to 4 dB. The lightweight porous nickel ferrite/carbon aerogel wave-absorbing material prepared herein is widely applicable to radar hiding, electromagnetic interference shielding, microwave dark rooms and other fields, and has the advantages of wide range of source and low cost.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to the preparation of a lightweight porous structure absorbing microwave material, in particular to a preparation method and application of a light porous microwave absorbing material. Background technique [0002] With the rapid development of electronic technology, electronic, electrical equipment or other information systems are more and more widely used in people's daily life, various fields of work and production. The widespread use and development of electronic equipment has brought great convenience to people's lives and greatly promoted the rapid development of social economy, but the electromagnetic radiation it brings has a great impact on human health and the ecological environment. If the electromagnetic radiation without effective control causes interference between various electronic devices, it will even lead to failure. Therefore, the research a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 张涛岳学杰邱凤仙杨冬亚戴玉婷徐吉成笪祖林
Owner JIANGSU UNIV
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