High-temperature-resistant modified double-horse-based electromagnetic composite material and preparation method thereof

A composite material and high temperature resistant technology, which is applied in the field of high temperature resistant modified bima-based electromagnetic composite materials and its preparation, can solve the problems of easy softening, insufficient bearing capacity, cumbersome and other problems, and achieve the effect of high temperature resistance and high magnetic loss

Inactive Publication Date: 2021-03-30
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this process also uses a relatively cumbersome wet ball mill, and the process controls the size of the flake powder by matching parameters such as the ball-to-material ratio, tungsten carbide grinding rod size, and ball milling time, which is difficult to grasp in practical applications.
[0005] At present, the wave-absorbing materials prepared in the prior art still have insufficient bearing capacity, are easy to soften, degrade, and release small molecular substances to cause pollution, especially under the environmental conditions of high-power electronic equipment. Therefore, there is an urgent need for solutions that can solve the above technical problems. Absorbing material and its preparation method

Method used

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  • High-temperature-resistant modified double-horse-based electromagnetic composite material and preparation method thereof
  • High-temperature-resistant modified double-horse-based electromagnetic composite material and preparation method thereof

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preparation example Construction

[0016] The first aspect of the present invention provides a method for preparing a high-temperature-resistant modified double-horse resin-based electromagnetic wave-absorbing composite material. The method includes the following steps:

[0017] (1) Mix FeSiAl powder, carbonyl iron powder, acetone, and coupling agent evenly and dry to obtain FeSiAl / carbonyl iron composite powder;

[0018] (2) mixing and melting bismaleimide resin, epoxy resin and curing agent to obtain bismaleimide resin glue;

[0019] (3) Mix the FeSiAl / carbonyl iron composite iron powder prepared in step (1) with the Shuangma resin glue prepared in step (2) to obtain FeSiAl / carbonyl iron powder / Shuangma resin slurry;

[0020] (4) remove the diluent in FeSiAl / carbonyl iron powder / double horse resin slurry;

[0021] (5) The FeSiAl / carbonyl iron powder / Shuangma resin slurry from which the diluent has been removed is solidified and molded to obtain a high-temperature-resistant modified Shuangma resin-based elect...

Embodiment 1

[0046] Weigh 100g 4,4'-bismaleimide diphenylmethane, 10g E51 epoxy resin (viscosity at room temperature is 1200cP), 40g 4,4'-diaminodiphenylsulfone, stir at 140°C for 1h until uniform , to obtain modified double horse resin (the proportion of hydroxyl group is 9.7%); then 80g untreated carbonyl iron powder (average particle size is 3.0 micron), 20g modified double horse resin, 0.2g KH-550 are mixed under vacuum assistance Stir for 6 hours; finally, pour the composite slurry into the mold, and mold it in an autoclave under 1 MPa pressure, 140°C / 2h, 170°C / 2h, 200°C / 3h, and finally get carbonyl iron powder / modified double horse resin composite Material.

Embodiment 2

[0048] Mix 800g steel balls (12mm(200g)+8mm(450g)+5mm(150g)) with 450g FeSiAl powder and 200g carbonyl iron powder, then add 0.1g calcium stearate and 400mL acetone together and put them in the ball mill jar , fixed speed 400r / min high-energy ball mill 16h, the average particle size obtained is 3.1 micron powder; Weigh 100g 4,4'-bismaleimide diphenylmethane, 10g E51 epoxy resin (viscosity at room temperature is 1200cP ), 40g of 4,4'-diaminodiphenylsulfone, stirred at 140°C for 1h until uniform, and obtained modified bis-horse resin (the proportion of hydroxyl group was 11.6%); then 400g of ball-milled flake FeSiAl / carbonyl iron powder , 105g modified Shuangma resin, 0.2g KH-550 were mixed and stirred for 2h under vacuum assistance; finally, the composite slurry was poured into the mold, under 1MPa pressure, 140°C / 2h, 170°C / 2h, 200°C / 3h It is molded in an autoclave to finally obtain a flaky FeSiAl / carbonyl iron powder / modified double horse resin composite material.

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Abstract

The invention provides a high-temperature-resistant modified double-horse-based electromagnetic composite material and a preparation method thereof, and belongs to the field of electronic functional materials. According to the method, a raw material system is composed of FeSiAl powder, carbonyl iron composite powder, bismaleimide resin, a coupling agent, a curing agent and the like, the FeSiAl/carbonyl iron composite powder is prepared through wet dispersion treatment, and wave-absorbing powder and a bismaleimide resin system are kneaded evenly through a vacuum assisted mixing method; the FeSiAl/carbonyl iron powder/bismaleimide resin composite material is prepared by adopting an autoclave molding process. The composite material prepared by the method disclosed by the invention shows relatively high electromagnetic property in a range of 3-18 GHz, and can be widely applied to the aspects of high-power antennas, synthetic splitters, isolators and the like.

Description

technical field [0001] The invention relates to the technical field of electronic functional composite materials, in particular to a high-temperature-resistant modified bima-based electromagnetic composite material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, the electromagnetic pollution caused by the information age is becoming more and more serious, which seriously affects the normal operation of electronic equipment and seriously interferes with the transmission of radar, broadcasting, and satellite digital signals. The continuous integration of various types of high-power antenna technologies not only brings electromagnetic pollution, but also puts forward technical indicators such as high temperature resistance, broadband and high magnetic loss for electronic functional materials, which are difficult to meet only by compounding a single absorber system with epoxy resin. [0003] The patent applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L63/02C08K3/18C08K3/34
CPCC08L79/085C08L2201/08C08L63/00C08K3/18C08K3/34
Inventor 兰天李南董立超张春波张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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