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Structural wave-absorbing composite material and preparation method thereof

A composite material and wave-absorbing layer technology, applied in the field of wave-absorbing materials, can solve the problems of high density, poor high-temperature thermal stability, and large thickness of coating-type wave-absorbing materials, and achieve excellent wave-absorbing performance and mechanical load-bearing performance, and improve Mechanical properties, the effect of simple structure

Pending Publication Date: 2020-09-22
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the coating-type wave-absorbing material has defects such as high density, large thickness, easy to fall off, and poor high-temperature thermal stability.

Method used

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  • Structural wave-absorbing composite material and preparation method thereof
  • Structural wave-absorbing composite material and preparation method thereof
  • Structural wave-absorbing composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] A self-made low-viscosity hot-melt epoxy resin is added to a coating machine to prepare an epoxy resin film, and the viscosity of the resin film at 50° C. is lower than 40000 cps. Put the film and aramid fiber into the impregnation machine for continuous hot-press impregnation to prepare the wave-transmissive layer prepreg, the impregnation temperature is 70-90°C, and the impregnation speed is <5m / min. The prepared wave-transparent layer prepreg has a resin content of 50 wt%.

[0023] Put the self-made low-viscosity hot-melt epoxy resin at 60-85°C and add it to the double planetary dispersion mixer. The viscosity of the resin at 60°C is lower than 10000cps; the stirring temperature is the same as the resin hot-melt temperature, stirring for 3-5min, The resin is in a melted homogeneous state. Then add superconducting carbon black in 3-4 times, and stir for 5 minutes after each addition, wherein superconducting carbon black D50 is 7-9um, D90 is 10-15um, and the resistivi...

example 2

[0027] The difference from Example 1 is that the wave-transmitting layer fibers are quartz fibers, and the resin content is 45wt%; the added carbon-based absorbent is graphene, D50 is 6-10um, D90 is 10-15um, and the resistivity is 0.05-0.2 Ω m; the mass fraction ratio of each component of the prepreg for the absorbing layer: resin: hybrid fiber: wave absorbing agent is 39:60:1; the hybrid fiber for the prepreg for the absorbing layer is aramid fiber / carbon fiber (carbon fiber accounts for 35wt% ).

example 3

[0029] The difference from Example 1 is that the resin content of the wave-transparent layer is 30wt%; the added carbon-based absorbent is superconducting carbon black and graphene, wherein the superconducting carbon black D50 is 5-10um, D90 is 12-15um, and the resistance The resistivity is 0.25-0.75Ω m, the graphene D50 is 6-10um, the D90 is 10-15um, the resistivity is 0.1-0.3Ω m, the mass ratio of superconducting carbon black to graphene is 3:2; The mass fraction ratio of each component of impregnation resin: hybrid fiber: wave absorbing agent is 46:50:4; the resin content of the reflection layer is 35wt%.

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Abstract

The invention provides a wave-absorbing composite material, which comprises a wave-transmitting layer, a wave-absorbing layer and a reflecting layer; the wave-absorbing layer is prepared from, by mass, 30%-50% of resin, 47%-67% of hybrid fiber and 1%-4% of wave-absorbing agent. According to the wave-absorbing composite material, the structural design of the surface wave-transmitting layer, the middle wave-absorbing layer and the bottom reflecting layer is adopted, low-viscosity hot-melt resin and a carbon-series wave-absorbing agent are mixed to prepare a wave-absorbing layer resin adhesive film, and then hybrid fibers and the wave-absorbing layer resin adhesive film are prepared to obtain the wave-absorbing prepreg. According to the invention, no extra solvent needs to be added in the preparation process, so that no pollution is caused, and the prepared wave-absorbing composite material has excellent mechanical properties and wave-absorbing performance and can meet the requirement forintegration of the structure and the wave-absorbing function.

Description

【Technical field】 [0001] The invention relates to the field of wave-absorbing materials, in particular to a structural wave-absorbing composite material and a preparation method thereof. 【Background technique】 [0002] Absorbing materials can be divided into two categories according to their carrying capacity, coating absorbing materials and structural absorbing materials. The coating absorbing material is to mix the absorbing agent with the adhesive and apply it on the target surface to form a absorbing coating. Although this type of absorbing material has simple process and low cost, the coated absorbing coating has a density Large, thick, easy to fall off, poor high temperature thermal stability and other defects, can not meet the use requirements under many conditions. Structural absorbing materials are multifunctional composite materials developed on the basis of advanced composite materials. They not only have good absorbing properties, but also have functions such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/20B32B27/38B32B33/00B29C70/50B29C70/54C08K3/04C08L63/00
CPCB32B27/08B32B27/20B32B27/38B29B15/14B29C70/50B29C70/54C08K3/04C08K3/041C08K3/042B32B2260/046B32B2260/021B32B2605/18C08K2201/003C08K2201/001C08L63/00
Inventor 刘若鹏赵治亚刘良点张运湘杨鸿帆
Owner LUOYANG INST OF CUTTING EDGE TECH
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