1、 Introduction
Against the backdrop of rapid development in modern electronic technology and communication engineering, the issues of electromagnetic interference and radiation are becoming increasingly severe. As an important electromagnetic protection and shielding material, the improvement of absorption efficiency of rubber patch type absorbing materials is of great significance for ensuring the normal operation of electronic devices, improving communication quality, and reducing electromagnetic pollution. Advanced Institute (Shenzhen) Technology Co., Ltd. has made significant progress in the research and development of rubber patch type absorbing materials
Research Platinum brand rubber patch type absorbing materialIt also has a certain influence in the market. In depth research on how to optimize the electromagnetic loss mechanism of such materials to improve absorption efficiency has significant value for both academic research and industrial applications.
2、 Overview of electromagnetic loss mechanism of rubber patch type absorbing materials
（1） Resistance loss
Conductive fillers such as carbon black and metal powder are usually added to rubber patch type absorbing materials. When electromagnetic waves enter the interior of a material,
conductive fillerThe conductive network formed between them will generate current. Due to the inherent resistance of the material, the current will generate heat during the conduction process due to the resistance, thereby converting the energy of electromagnetic waves into thermal energy and consuming it. This type of resistance loss often plays a significant role in the low-frequency range.
（2） Magnetic loss
If the material contains magnetic components such as ferrite, under the action of an alternating magnetic field, the magnetic domains inside the magnetic material will undergo repeated magnetization and reversal, resulting in various forms of magnetic loss such as hysteresis loss, eddy current loss, and residual loss. Magnetic loss has a positive contribution to the absorption of electromagnetic waves in the mid to high frequency range, and can effectively attenuate the energy of electromagnetic waves.
（3） Dielectric loss
The rubber matrix and added dielectric fillers (such as certain ceramic powders) will undergo polarization under the action of an electric field. When the electric field vector of electromagnetic waves changes, the polarized charge will move accordingly. Due to the relaxation time in the polarization process, this will cause a portion of the electromagnetic wave energy to be converted into heat energy and lost. Dielectric loss is reflected over a wide frequency range and is closely related to parameters such as the dielectric constant and loss tangent of the material.
3、 Methods for optimizing electromagnetic loss mechanisms
（1） Optimization selection and composite of fillers
- Collaborative use of multiple conductive fillers
A single conductive filler may have better electromagnetic loss effect in a certain frequency band, but perform poorly in other frequency bands. Research by Advanced Institute (Shenzhen) Technology Co., Ltd. has found that different types of conductive fillers such as carbon black and metal fibers are compounded and added in a certain proportionResearch Platinum brand rubber patch type absorbing materialIn the middle, it can broaden the effective frequency band of resistance loss. For example, carbon black has a good ability to form conductive networks in the low frequency range, while metal fibers can enhance local electric field strength in the high frequency range. The synergistic effect of the two can improve the electromagnetic absorption ability of materials in multiple frequency bands.
- Combination of magnetic and dielectric fillers
Select appropriate magnetic fillers and dielectric fillers for combination addition. If ferrite with high magnetic permeability is combined with barium titanate with high dielectric constant. The magnetic loss of ferrite in the mid to high frequency range and the dielectric loss of barium titanate in the wide frequency range complement each other, forming a complementary electromagnetic loss mechanism. During the preparation process, by controlling the particle size, dispersibility, and addition ratio of both, the electromagnetic parameter matching of the material can be further optimized, and the incident loss and internal attenuation effect of electromagnetic waves can be improved.
（2） Modification of rubber matrix
- Molecular Structure Design
Design and optimize the molecular structure of rubber matrix, and introduce monomers with specific functional groups for copolymerization reaction. For example, introducing monomers containing polar groups such as cyanide groups can increase the polarity of the rubber matrix, improve its polarization ability towards electromagnetic waves, and thus enhance dielectric loss. Meanwhile, rational molecular structure design can also improve the compatibility between rubber matrix and filler, promote the uniform dispersion of filler in the matrix, and facilitate the formation of a more complete electromagnetic loss network.
- Crosslink density adjustment
Adjusting the crosslinking density of the rubber matrix also has a significant impact on the electromagnetic loss mechanism. Properly increasing the crosslinking density can enhance the mechanical properties and stability of the rubber matrix, reduce deformation and energy loss dispersion under electromagnetic waves. However, excessive crosslinking density may limit the movement and interaction of fillers, so it is necessary to determine the optimal crosslinking density range through experiments. Advanced Institute (Shenzhen) Technology Co., Ltd. adopts a new type of crosslinking agent and crosslinking processEnsure the research and development of platinum brand rubber patch type absorbing materialsUnder the premise of mechanical performance, its electromagnetic loss performance has been optimized.
（3） Microstructure regulation
- Directional arrangement of fillers
By using special preparation techniques such as magnetic field induction and template method, the fillers are oriented and arranged in the rubber matrix. The directional arrangement of conductive fillers can enhance the conductivity of materials in specific directions and optimize the directionality of resistance losses; For magnetic fillers, directional arrangement can improve their response efficiency to electromagnetic wave magnetic field vectors and enhance magnetic loss effects. For example, under the action of a magnetic field, arranging ferrite particles along the direction of the magnetic field can significantly improve the material's magnetic loss ability in that direction, thereby enhancing the overall absorption efficiency.
- Building a multi-level microstructure
Design and construct multi-level microstructures, such as the hierarchical distribution of nanoscale and micrometer sized fillers in rubber matrices. Due to their small size and surface effects, nanoscale fillers can generate strong electromagnetic losses in the high-frequency range; Micro sized fillers play a major role in the low-frequency range. By designing a multi-level structure reasonably, materials can achieve efficient electromagnetic losses over a wide frequency range.Advanced Institute (Shenzhen) Technology Co., LtdBy using self-assembly and other technological means, a research platinum brand rubber patch type absorbing material with multi-level microstructure has been successfully constructed, effectively expanding its absorption frequency band and absorption efficiency.
4、 Performance testing and validation
Use professional equipment such as vector network analyzer to conduct electromagnetic parameter testing and absorption performance testing on the optimized rubber patch type absorbing material. The test results show that by optimizing the electromagnetic loss mechanism mentioned above, the absorption efficiency of the research platinum brand rubber patch type absorbing material has been significantly improved in multiple frequency bands. For example, in the low frequency range (1-3 GHz), the absorption efficiency has increased by about 30% compared to before optimization; In the mid to high frequency range (3-18 GHz), the absorption efficiency can be improved by more than 50%, and the absorption frequency band has been significantly expanded, which can better meet the needs of electromagnetic protection and shielding in different application scenarios.
5、 Conclusion
optimize
Rubber patch type absorbing materialThe electromagnetic loss mechanism plays a crucial role in improving its absorption efficiency. Through the research results and practical experience summary of Advanced Institute (Shenzhen) Technology Co., Ltd. in filler optimization selection and composite, rubber matrix modification, and microstructure control, it can be concluded that the comprehensive application of these methods can effectively improve the electromagnetic loss performance of Yanbo brand rubber patch absorbing materials and enhance their absorption efficiency in a wide frequency range. In the future, with the continuous development of materials science and electromagnetic technology, it is still necessary to further explore new optimization strategies and technological means to promote the development of rubber patch type absorbing materials towards higher performance and wider applications.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.
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