A shape self-repairing wave-absorbing material and its preparation method

A wave absorbing material and self-healing technology, applied in the field of wave absorbing material preparation, can solve the problems of short service life, decreased wave absorbing performance, low service durability, etc., and achieve high toughness, improved service life, and good shape recovery rate. Effect

Active Publication Date: 2021-04-23
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, once the cured absorbing material is damaged and deformed by external force, the impedance matching relationship of the deformed part will also change, which will cause a decline in the absorbing performance. It continues to be used, and the existing wave-absorbing materials generally have problems such as short service life and low durability
However, in recent years, the research on absorbing materials has mainly focused on improving the toughness, heat resistance, water resistance, and chemical resistance of absorbing materials. There are no relevant reports on the preparation of shape self-healing absorbing materials.

Method used

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  • A shape self-repairing wave-absorbing material and its preparation method
  • A shape self-repairing wave-absorbing material and its preparation method
  • A shape self-repairing wave-absorbing material and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0028] In the present invention, the preparation method of the shape self-repairing absorbing material includes the following steps:

[0029] (1) Set the mass ratio to 1: (0.02~0.33): (0.01~0.017) (for example, 1:0.02:0.01, 1:0.02:0.011, 1:0.02:0.012, 1:0.02:0.013, 1:0.02: 0.014, 1:0.02:0.015, 1:0.02:0.016, 1:0.02:0.017, 1:0.05:0.01, 1:0.05:0.011, 1:0.05:0.012, 1:0.05:0.013, 1:0.05:0.014, 1:0.05:0.015, 1:0.05:0.016, 1:0.05:0.017, 1:0.1:0.01, 1:0.1:0.011, 1:0.1:0.012, 1:0.1:0.013, 1:0.1:0.014, 1: 0.1:0.015, 1:0.1:0.016, 1:0.1:0.017, 1:0.2:0.01, 1:0.2:0.011, 1:0.2:0.012, 1:0.2:0.013, 1:0.2:0.014, 1:0.2: 0.015, 1:0.2:0.016, 1:0.2:0.017, 1:0.33:0.01, 1:0.33:0.011, 1:0.33:0.012, 1:0.33:0.013, 1:0.33:0.014, 1:0.33:0.015, 1:0.33:0.016 or 1:0.33:0.017) resin matrix, toughening agent (such as monoamine toughening agent) and curing agent (such as diamine curing agent) are mixed uniformly to obtain a resin prepolymer, the The resin matrix is ​​selected from the group consisting of epo...

Embodiment 1

[0055] ① Weigh the corresponding mass of epoxy resin (E-51) and n-octylamine according to the mass ratio of 1:0.31, put them into an oven and heat to 80°C, and keep at constant temperature for 20min.

[0056] ②Then mix the epoxy resin with n-octylamine, stir evenly, add m-xylylenediamine, the mass ratio of m-xylylenediamine to epoxy resin is 0.017:1, stir again evenly, and obtain the resin prepolymer.

[0057] ③ Next, add the carbonyl iron powder absorbent into the resin prepolymer in four times and stir evenly. The amount of carbonyl iron powder added is 50% of the mass of the epoxy resin to obtain a shape self-repairing wave-absorbing resin.

[0058] ④Then put the shape self-repairing wave-absorbing resin into the vacuum oven for 10 minutes to remove the air bubbles in the system, and then inject it into the metal mold that has been preheated and coated with a release agent, and then evacuate again 10min, and heat curing, the specific curing system is: 60 ℃ / 1h + 100 ℃ / 2h...

Embodiment 2

[0062] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0063] In ①, according to the mass ratio of 1:0.33, weigh the corresponding mass of epoxy resin (E-51) and n-octylamine respectively, put them into an oven and heat to 80°C, and keep at constant temperature for 20min.

[0064] In ②, then mix the epoxy resin with n-octylamine, stir evenly and add m-xylylenediamine, the mass ratio of m-xylylenediamine to epoxy resin is 0.01:1, stir again evenly to obtain resin prepolymerization things.

[0065] Using the same method as in Example 1, the shape self-repairing performance of the shape self-repairing absorbing material prepared in this example is tested, and the results are shown in Table 1. The shape self-repairing absorbing material prepared in this example is Before the shape is destroyed, the reflectivity value at 3GHz is -9dB. After the shape is compressed and deformed, the reflectivity value at 3GHz increases to -6.9dB. After the shape self-repair...

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Abstract

The invention relates to a shape self-repairing wave-absorbing material and a preparation method thereof. The method includes: (1) uniformly mixing a resin matrix, a toughening agent and a curing agent with a mass ratio of 1:(0.02-0.33):(0.01-0.017) to obtain a resin prepolymer, and the resin matrix is ​​selected from epoxy A group consisting of resin, polyurethane resin, polystyrene resin and polynorbornene resin; (2) adding ferrite powder, carbonyl iron powder, conductive carbon black, carbon fiber, silicon carbide to the obtained resin prepolymer fiber, carbon nanotubes and graphene and stir evenly to obtain a shape self-repairing absorbing resin; (3) curing the shape self-repairing absorbing resin at two or more different temperature stages to obtain a shape self-repairing absorbing resin Repair the absorbing material. The method of the invention endows the wave-absorbing material with shape self-repairing performance, and can meet the requirement of recovering the wave-absorbing performance of the wave-absorbing material after being damaged and deformed by an external force.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave-absorbing materials, in particular to a shape-self-repairing wave-absorbing material and a preparation method thereof. Background technique [0002] Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert their electromagnetic energy into heat energy and dissipate them, or make electromagnetic waves disappear due to interference. With the development of science and technology, absorbing materials have been widely used in various aspects. Fields such as electromagnetic protection, microwave anechoic chamber, mobile communication and military stealth are of great significance. [0003] At present, the preparation method of microwave-absorbing materials is mainly through the composite preparation of absorbents and matrix materials. Generally, the matrix materials are polymer elastomers, resins, or foams. The absorbing perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/02C08K3/08C08K3/04
CPCC08K3/04C08K3/08C08K9/02C08K2003/0856C08L63/00
Inventor 吕通卢明明马向雨宫元勋林海燕赵宏杰刘宇艳
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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