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Epoxy resin-based composite wave-absorbing material, preparation method and applications thereof

A composite wave absorbing material and epoxy resin matrix technology, applied in the field of wave absorbing materials, can solve problems such as unfavorable large-scale production, complex preparation process, complex structure, etc., and achieve strong practical value, simple preparation method, and excellent wave absorbing performance. Effect

Active Publication Date: 2019-12-06
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned composite materials either have a complex structure (such as a multi-layer structure, a core-shell structure), or at least three constituent phases are required to obtain better electromagnetic parameters and matching characteristics at the same time, which leads to a relatively complicated preparation process and low yield. High cost, not conducive to industrial mass production

Method used

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  • Epoxy resin-based composite wave-absorbing material, preparation method and applications thereof
  • Epoxy resin-based composite wave-absorbing material, preparation method and applications thereof
  • Epoxy resin-based composite wave-absorbing material, preparation method and applications thereof

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Embodiment 1

[0042] This embodiment provides an epoxy resin-based composite wave-absorbing material, which is prepared according to the following steps:

[0043] (1) In situ preparation of BaNb by the improved sol-gel method 0.65 Fe 11.35 o 19 Precursors, specifically: Weigh the corresponding mass of analytically pure barium acetate, ferric nitrate, and niobium oxalate according to the molar ratio of the formula, put them in three beakers, dissolve them with deionized water, and stir them magnetically for about 30~ 60 minutes;

[0044] Mix the solutions obtained above, add an appropriate amount of deionized water, and stir magnetically for about 2 to 3 hours to obtain a transparent sol that is BaNb 0.65 Fe 11.35 o 19 Precursor;

[0045] BaNb 0.65 Fe 11.35 o 19 The precursor was placed in a muffle furnace at 200°C for 1 hour, then raised to 400°C for a further 1 hour, and then sintered in a muffle furnace at 1350°C for 6 hours to obtain BMFO wave absorbing agent powder BaNb 0.65 F...

Embodiment 2

[0050] This embodiment provides an epoxy resin-based composite wave-absorbing material, which is prepared according to the following steps:

[0051] (1) In situ preparation of BaNb by the improved sol-gel method 0.63 Fe 11.37 o 19 Precursors, specifically: Weigh the corresponding mass of analytically pure barium acetate, ferric nitrate, and niobium oxalate according to the molar ratio of the formula, put them in three beakers, dissolve them with deionized water, and stir them magnetically for about 30~ 60 minutes;

[0052] Mix the solutions obtained above, add an appropriate amount of deionized water, and stir magnetically for about 2 to 3 hours to obtain a transparent sol that is BaNb 0.63 Fe 11.37 o 19 Precursor;

[0053] BaNb 0.63 Fe 11.37 o 19 The precursor was placed in a muffle furnace at 210°C for 2 hours, then raised to 450°C for a further 2 hours, and then sintered in a muffle furnace at 1400°C for 5 hours to obtain BMFO absorber powder BaNb 0.63 Fe 11.37 o...

Embodiment 3

[0058] This embodiment provides an epoxy resin-based composite wave-absorbing material, which is prepared according to the following steps:

[0059] (1) In situ preparation of BaNb by the improved sol-gel method 0.62 Fe 11.38 o 19 Precursors, specifically: Weigh the corresponding mass of analytically pure barium acetate, ferric nitrate, and niobium oxalate according to the molar ratio of the formula, put them in three beakers, dissolve them with deionized water, and stir them magnetically for about 30~ 60 minutes;

[0060] Mix the solutions obtained above, add an appropriate amount of deionized water, and stir magnetically for about 2 to 3 hours to obtain a transparent sol that is BaNb 0.62 Fe 11.38 o 19 Precursor;

[0061] BaNb 0.62 Fe 11.38 o 19 The precursor was placed in a muffle furnace at 240°C for 2.5 hours, then raised to 480°C for a further 2.5 hours, and then sintered in a muffle furnace at 1420°C for 4 hours to obtain BMFO absorber powder BaNb 0.62 Fe 11....

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Abstract

The invention discloses an epoxy resin-based composite wave-absorbing material, a preparation method and applications thereof, wherein the epoxy resin-based composite wave-absorbing material comprises20-60 wt% of an epoxy resin matrix and 40-80 wt% of a BMFO wave-absorbing agent, the BMFO wave-absorbing agent is BaMyFe12-yO19, y is more than 0.55 and less than 0.65, and M is at least one selectedfrom Mo<6+>, Nb<5+> and W<6+>. According to the present invention, by controlling the type and the content of the doping component M, the formed composite wave-absorbing material has excellent wave-absorbing performance in an R waveband, further has characteristics of high reflection loss strength and thin matching thickness, can cover the effective absorption bandwidth of the whole R band (millimeter wave band) under proper components and proper thickness, has high practical value, and further has good application prospect in the fields of electromagnetic shielding, electronic packaging andthe like.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to an epoxy resin-based composite wave-absorbing material and its preparation method and application. Background technique [0002] With the rapid development of electronic communication technology, more and more electronic equipment (such as mobile communication equipment, medical equipment products, precision electronic components) need to consider electromagnetic shielding. The 5G communication technology that has emerged in recent years has pushed the frequency of use to The millimeter-wave frequency band, which makes the absorbing materials below the millimeter-wave frequency band that have been widely studied before, cannot be applied to the needs of emerging technologies and new scenarios. Therefore, it is of great significance to develop high-performance broadband absorbing materials in the millimeter wave frequency band to achieve more effective electromagnetic shielding. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K3/22H05K9/00
CPCC08K3/22H05K9/0081C08L63/00
Inventor 汪宏肖彬
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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