Epoxy Resin Wave-Absorbing Composite Material
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Solution Overview
Problem
Conventional wave-absorbing composite materials face challenges with high density and narrow wave-absorbing bandwidth, failing to meet the requirements of being thin, light, wide, and strong for electromagnetic shielding applications.
Innovation Solution
The use of epoxy resin as a base material combined with surface-treated hollow glass microbeads and carbon black, processed with a silane coupling agent, to create a composite material with reduced density and enhanced electromagnetic shielding performance across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wave-absorbing composite materials (ferrite, graphite, ceramics) are used, then electromagnetic shielding performance is achieved, but density is high and wave-absorbing bandwidth is narrow
Solution Approach 1:
The patent uses a composite material system consisting of epoxy resin base material, carbon black filler, and hollow glass microbeads. This composite structure combines the electromagnetic shielding capabilities of carbon black with the lightweight properties of hollow glass microbeads and the bonding properties of epoxy resin, achieving both high shielding performance and low density
Solution Approach 2:
The hollow glass microbeads create a porous, lightweight structure within the composite material. These hollow spheres reduce the overall density while providing additional interfaces for electromagnetic wave absorption, thereby maintaining shielding effectiveness while significantly reducing material weight
2Reliability
If traditional wave-absorbing composite materials are used, then electromagnetic shielding is provided, but wave-absorbing bandwidth is narrow
Solution Approach 1:
The patent employs carbon black particles with specific surface area and conductivity characteristics to create localized electromagnetic absorption zones. The hollow glass microbeads provide additional localized absorption mechanisms through their unique structure, together creating a broadband absorption effect that covers a wider frequency range
Solution Approach 2:
The patent optimizes parameters including carbon black content (20-40 parts by weight), hollow glass microbead content (30-50 parts by weight), and particle size distribution to achieve broadband absorption. By adjusting these compositional parameters, the material absorbs electromagnetic waves across a wide frequency spectrum from low to high frequencies
3Weight of moving object
If hollow glass microbeads are used as wave-absorbing agent, then density is reduced and wave-absorbing bandwidth is widened, but dispersion uniformity and surface conjunction may deteriorate
Solution Approach 1:
The epoxy resin acts as an intermediary bonding matrix that uniformly distributes and anchors the hollow glass microbeads and carbon black particles. This resin matrix prevents agglomeration of the filler particles and ensures uniform dispersion throughout the composite material structure
Solution Approach 2:
The composite formulation combines epoxy resin with specific ratios of carbon black and hollow glass microbeads to create a homogeneous mixture. The resin's adhesive properties ensure stable bonding between different components, maintaining compositional stability and uniform distribution of the lightweight filler particles
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting epoxy resin wave-absorbing composite material achieves reflectivity less than -5 dB within the 0.5~18 GHz range with a minimum density of 0.85 g/cm3, effectively addressing the limitations of traditional materials by providing strong absorption over a broad band while maintaining low weight.
Implementation Method 1
using a silane coupling agent to process hollow glass microbeads facilitates even dispersion of the hollow glass microbeads in the epoxy resin base, so that a good surface conjunction can be formed between the epoxy resin and the hollow glass microbeads
Implementation Method 2
carbon black with superb electromagnetic shielding performance and surface-treated hollow glass microbeads are used as a wave-absorbing agent, so that the composite material has good electromagnetic shielding performance... strong absorption of electromagnetic waves within a relatively wide band
Data Source
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AI summary
The present disclosure provides an epoxy resin wave-absorbing composite material and a preparation method thereof. The method includes: heating an epoxy resin to 50°C∼70°C, and adding carbon black, to obtain a mixture of the epoxy resin and the carbon black; heating the mixture of the epoxy resin and the carbon black to 100°C∼120°C, adding a curing agent, and stirring and dissolving them to obtain a mixture of the epoxy resin, the carbon black, and the curing agent; and adding surface-treated hollow glass microbeads into the mixture of the epoxy resin, the carbon black, and the curing agent, and curing them to obtain the epoxy resin wave-absorbing composite material.