Electromagnetic wave shielding element and electromagnetic wave shielding device
By mixing core-shell conductive powder and microsphere core-shell structure within a liquid silicone substrate to form a closed-cavity electromagnetic wave shielding element, the problems of high density, heavy weight, and high cost of traditional electromagnetic shielding materials are solved. This achieves lightweighting, improved conductivity and shielding performance, and adaptability to extreme environments.
Patent Information
- Application Number
- CN202520108046.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-16
AI Technical Summary
Traditional electromagnetic shielding materials are dense, heavy, and expensive, and their performance is poor in extreme environments. They cannot effectively reduce electromagnetic wave reflection and lack wave absorption capabilities, resulting in unsatisfactory shielding effects.
The system employs a liquid silicone substrate with a hybrid core-shell structure of conductive powder and a microsphere core-shell structure. The microsphere core-shell structure forms a closed cavity after heating, which changes the impedance and provides wave absorption. The outer shell is made of an elastic material to reduce density and compressive stress.
It achieves lightweight design, improved conductivity and shielding performance, adaptability to high and low temperature environments, maintains good resilience and electromagnetic wave isolation performance, has wide applicability, and does not deform in appearance.
Smart Images
Figure CN223758649U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of electromagnetic shielding and sealing, and more particularly relates to an electromagnetic wave shielding element and an electromagnetic wave shielding device. BACKGROUND
[0002] With the rapid development of modern science and technology, the demand for electromagnetic shielding technology is increasing in the fields of intelligent driving cars, national defense and military industry, high-speed communication base stations, data centers, etc. In these application scenarios, electromagnetic interference (EMI) has become one of the key factors restricting the stability and performance of equipment. Therefore, how to effectively solve the problem of electromagnetic interference and ensure the normal operation of equipment, especially in high-frequency and high-power environments, has become the focus of current technical research and engineering application.
[0003] In electronic equipment, the PCBA circuit board is the most basic unit of electromagnetic interference protection. The electromagnetic shielding of the PCBA board not only relates to the stability of individual components, but also determines the electromagnetic compatibility (EMC) of the entire device.
[0004] Traditional electromagnetic shielding technology usually relies on the use of conductive materials, such as conductive metal shields, conductive coatings, and shielding adhesive strips. Although these materials can effectively isolate electromagnetic waves, because they are all solid structures, they often have high density, high weight, high cost, and difficulty in meeting performance requirements in extreme environments such as high temperature and low temperature, and the elastic performance needs to be improved. In addition, as shown in the prior art, the traditional shielding material is only filled with shell-core structure conductive powder, so that the shielding material only has electromagnetic shielding effect and lacks wave absorption capability, which cannot effectively reduce electromagnetic wave reflection, resulting in unsatisfactory shielding effect. Figure 1 The utility model discloses a kind of electromagnetic wave shielding element and electromagnetic wave shielding device, to solve the technical problems existing in prior art. The utility model contents
[0005] The purpose of the embodiment of the present application is to provide an electromagnetic wave shielding element and an electromagnetic wave shielding device to solve the technical problems existing in the prior art.
[0006] To achieve the above-mentioned purpose, the first aspect of the present application provides an electromagnetic wave shielding element, comprising:
[0007] Liquid silicone base, which can be processed into a predetermined shape;
[0008] Shell-core structure conductive powder mixed in the liquid silicone base and uniformly distributed in the liquid silicone base 10;
[0009] Microsphere shell-core structure mixed in the liquid silicone base and uniformly distributed in the liquid silicone base to replace part of the liquid silicone base in the liquid silicone base;
[0010] The microsphere shell-core structure comprises an outer shell and a replacement medium filled in the inner part of the outer shell, the replacement medium is used to form the inner core structure of the microsphere shell-core structure, the outer shell is made of elastic material, and the replacement medium is used to replace air in the outer shell after being vaporized at high temperature to form a closed cavity in the outer shell.
[0011] The shell-core structure conductive powder is used to shield electromagnetic waves, and the microsphere shell-core structure is used to change the impedance of the electromagnetic wave shielding element.
[0012] Optionally,
[0013] The outer shell is made of polymethyl methacrylate material.
[0014] Optionally, the replacement medium is any one of n-hexane, ethyl acetate, chloroform, and dichloromethane.
[0015] Optionally, the diameter of the cavity is less than or equal to 0.3 times the wavelength of the target electromagnetic wave.
[0016] Optionally, the diameter of the outer shell is less than or equal to 40 microns.
[0017] Optionally, the preset shape is a sheet or a strip.
[0018] Optionally, when the preset shape is a strip, the cross-sectional shape of the preset shape is any one of a trapezoidal shape, an n shape, a D shape, or a triangular shape.
[0019] Optionally, characterized in that,
[0020] The density of the electromagnetic wave shielding element is 1.3-1.8 g / cm 3 .
[0021] Optionally, the compression rate of the electromagnetic wave shielding element is 10%-60%.
[0022] Compared with the prior art, the electromagnetic wave shielding element provided by the present application fills the microsphere shell-core structure in the liquid silicone rubber base to replace part of the liquid silicone rubber base, and the outer shell of the microsphere shell-core structure is made of elastic material, and a closed cavity is formed in the inner part after heating. The electromagnetic wave shielding element provided by the present application has the following advantages:
[0023] 1. After the microsphere shell-core structure is filled into the liquid silicone rubber base, a closed cavity is formed in the inner part after heating, which reduces the density of the electromagnetic wave shielding element. Compared with the prior art, the density of the electromagnetic wave shielding element is 1.3-1.8 g / cm 3Thus, the mass of the electromagnetic wave shielding element is reduced, so that the electronic product using the electromagnetic wave shielding element is lightened;
[0024] 2. After the microsphere shell-core structure is filled into the liquid silicone rubber base, the mutual distribution between the particles of the conductive powder structure is not affected, and because the shell of the microsphere shell-core structure is made of elastic material and a closed cavity is formed in the interior thereof after heating, the electromagnetic wave shielding element is more easily compressed, and after compression, the conductive powder in the shell-core structure is more easily in conductive contact, the conductivity of the electromagnetic wave shielding element is improved, the resistance of the electromagnetic wave shielding element is reduced, and the shielding performance of electromagnetic waves is improved. Meanwhile, the compression stress in the interior of the electromagnetic wave shielding element after compression is lower than that in the prior art, so that the electromagnetic wave shielding element is adapted to the use environment of low compression stress required in the automobile electronic element;
[0025] 3. Because the liquid silicone rubber base and the shell of the microsphere shell-core structure are both elastic after solidification, when the compression rate of the electromagnetic wave shielding element is between 10% and 60%, the electromagnetic wave shielding element still has good resilience, so that the electromagnetic wave shielding element is not prone to permanent deformation, and the electromagnetic wave shielding element is not prone to cracking and short circuit;
[0026] 4. Because the liquid silicone rubber base and the shell of the microsphere shell-core structure are both elastic after solidification, the electromagnetic wave shielding element has elasticity after solidification of the liquid silicone rubber base. After the electromagnetic wave shielding element undergoes multiple cycles of high and low temperature environments, the electromagnetic wave shielding element still maintains good isolation performance for electromagnetic waves;
[0027] 5. Because a closed cavity is formed in the interior of the microsphere shell-core structure after heating, the impedance of the electromagnetic wave shielding element is changed after the microsphere shell-core structure is filled into the liquid silicone rubber base, so that the electromagnetic wave shielding element also has the function of absorbing electromagnetic waves;
[0028] 6. Because the microsphere shell-core structure forms a closed cavity in the interior thereof after heating, compared with the existing open-cell foam structure, liquid and gas cannot penetrate the electromagnetic wave shielding element, so that the electromagnetic wave shielding element has wider applicability. The microsphere shell-core structure has a certain volume and is made of elastic material, and the diameter of the microsphere shell-core structure can be adjusted by heating. Because the cavity contains gas, the microsphere shell-core structure restores well in shape after compression, so that the appearance of the electromagnetic wave shielding element does not have obvious deformation.
[0029] In a second aspect, the application provides an electromagnetic wave shielding device, comprising:
[0030] An electromagnetic wave shielding element as described in any one of the preceding embodiments.
[0031] Compared with the prior art, the electromagnetic wave shielding device provided by the application comprises the electromagnetic wave shielding element provided in any one of the preceding embodiments, and has the same beneficial effects as the electromagnetic wave shielding element, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.
[0033] Figure 1 It is an internal structure diagram of the electromagnetic wave shielding element in the prior art;
[0034] Figure 2 It is an internal structure diagram of the electromagnetic wave shielding element provided by the embodiments of the application;
[0035] Figure 3 It is an internal structure diagram of the electromagnetic wave shielding element provided by the embodiments of the application after magnetization;
[0036] Figure 4 It is a sectional view of the microsphere shell-core structure provided by the embodiments of the application;
[0037] Figure 5 It is a structure diagram of the cavity in the microsphere shell-core structure provided by the embodiments of the application;
[0038] Figure 6 It is a sectional view of the electromagnetic wave shielding element provided by an embodiment of the application;
[0039] Figure 7 It is a sectional view of the electromagnetic wave shielding element provided by another embodiment of the application;
[0040] Figure 8 It is a sectional view of the electromagnetic wave shielding element provided by another embodiment of the application;
[0041] Figure 9 It is a relationship curve diagram between the diameter of the microsphere shell-core structure and the temperature in the application;
[0042] Figure 10 It is a relationship curve diagram between the compression rate of the electromagnetic wave shielding element and the electromagnetic wave shielding rate in the application.
[0043] Wherein, the reference signs in the figures:
[0044] 10, liquid silicone base; 20, shell-core structure conductive powder; 30, microsphere shell-core structure; 31, outer shell; 32, displacement medium; 33, cavity. DETAILED DESCRIPTION
[0045] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.
[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0047] Please refer to Figures 1 to 9 , now a kind of electromagnetic shielding element and electromagnetic shielding equipment provided by the embodiment of the present application will be described.
[0048] To achieve the above object, the first aspect of the present application is to provide a kind of electromagnetic shielding element, including liquid silicone base 10, shell-core structure conductive powder 20 and microsphere shell-core structure 30.
[0049] Wherein, liquid silicone base 10 can be processed into a preset shape by any one of injection molding, coating molding, mold pressing, extrusion molding or dispensing molding. After being processed into a preset shape, liquid silicone base 10 is arranged at a preset position, such as being arranged at a gap in an electromagnetic shielding device, or being arranged at a position between an opening of a shielding box and a cover plate in an electromagnetic device.
[0050] Please refer to Figure 2 And Figure 3 Shell-core structure conductive powder 20 is mixed in silicone base and uniformly distributed in silicone base, and shell-core structure conductive powder 20 is a particle with conductivity and ferromagnetism.
[0051] When the structure of shell-core structure conductive powder 20 is formed or shaped by magnetic force, when a magnetic field is applied to the material of liquid silicone base 10, shell-core structure conductive powder 20 is oriented to be consistent with the direction of the magnetic field due to the ferromagnetism of shell-core structure conductive powder 20 under the influence of the magnetic field, such as shell-core structure conductive powder 20 arranged along the direction of the magnetic field, and after liquid silicone base 10 is processed into a preset shape, shell-core structure conductive powder 20 contacts each other to conduct electricity, thereby shielding electromagnetic waves.
[0052] Wherein, when the shell-core structure conductive powder 20 is magnetized, the magnetic flux is located at 100-2500 Gauss, and the magnetization time is located at 1-15 seconds.
[0053] Meanwhile, since the shell-core structure conductive powder 20 has ferromagnetism and can be affected by the magnetic field, the strength of the magnetic field and the action time can be adjusted as needed to make the shell-core structure conductive powder 20 directional in the liquid silicone base 10 and adapt to different shapes of the preset shape.
[0054] When the liquid electromagnetic wave shielding element is processed into a preset shape as needed, the liquid silicone base 10 can be solidified by heating to make the electromagnetic wave shielding element remain in the preset shape. In this application, the high-temperature curing temperature is any temperature value between 130-200 degrees Celsius, and the high-temperature curing time is located between 10-40 minutes.
[0055] The microsphere shell-core structure 30 is mixed in the liquid silicone base 10 and uniformly distributed in the liquid silicone base 10 to replace part of the liquid silicone base 10 in the liquid silicone base 10.
[0056] The microsphere shell-core structure 30 includes an outer shell 31 and a replacement medium 32 filled inside the outer shell 31, and the replacement medium 32 is used to form the inner core structure of the microsphere shell-core structure 30. The outer shell 31 is made of elastic material, and the replacement medium 32 is used to replace air into the outer shell 31 after vaporization at high temperature to form a closed cavity 33 in the outer shell 31.
[0057] It should be noted that the replacement medium 32 is made of low-boiling-point material, and when the liquid silicone base 10 is solidified into a preset shape by heating, the replacement medium 32 vaporizes at high temperature and replaces air into the outer shell 31 to form a closed cavity in the outer shell 31.
[0058] Please refer to Figure 4 , Figure 5 and Figure 9 , initially set, the diameter of the outer shell 31 is D1, and the diameter of the inner core structure formed by the replacement medium 32 is D2. When the liquid silicone base 10 is solidified into a preset shape by heating, the replacement medium 32 is vaporized by heat and replaces air into the outer shell 31 to form a cavity 33 with a diameter of D2', and D2' is greater than D2. Since the outer shell 31 is made of elastic material, at this time, the diameter of the outer shell 31 increases from D1 to D1', and the wall thickness of the outer shell 31 becomes thinner. Therefore, the diameter of the microsphere shell-core structure 30 and the diameter of the cavity 33 inside it can be adjusted by adjusting the temperature.
[0059] Wherein, in Figure 9In the figure, the lowermost curve is the curve of the diameter of the microsphere shell-nucleus structure 30 with an initial diameter of 5 microns at different temperatures, the middle curve is the curve of the diameter of the microsphere shell-nucleus structure 30 with an initial diameter of 15 microns at different temperatures, and the uppermost curve is the curve of the diameter of the microsphere shell-nucleus structure 30 with an initial diameter of 20 microns at different temperatures.
[0060] It can be seen that, as the temperature increases, the diameter of the microsphere shell-nucleus structure 30 gradually increases, and the degree of increase in the diameter of the microsphere shell-nucleus structure 30 gradually slows down, so that the diameter of the microsphere shell-nucleus structure 30 and the diameter of the internal cavity 33 can be adjusted by adjusting the temperature. Figure 9
[0061] When the electromagnetic wave passes through the microsphere shell-nucleus structure 30 provided with the cavity 33, the electromagnetic wave is reflected on the surface of the microsphere shell-nucleus structure 30, and the electromagnetic wave is reflected on the surface of the microsphere shell-nucleus structure 30 and returns, resulting in an increase in the energy loss of the electromagnetic wave, and the propagation path of the electromagnetic wave inside the cavity 33 is deflected, resulting in part of the electromagnetic energy being reflected from the original direction and another part being scattered by the inner wall of the cavity 33 to other directions. This scattering will cause the energy of the electromagnetic wave to decrease, thereby changing the impedance of the electromagnetic wave when it passes through the microsphere shell-nucleus structure 30, and further changing the impedance of the electromagnetic wave when it passes through the electromagnetic wave shielding element, thereby playing a role in absorbing the electromagnetic wave.
[0062] In the present application, the shell-nucleus structure conductive powder 20 is at least one of a nickel-carbon structure with a carbon outer layer wrapped around nickel inside, a silver-carbon structure with a carbon outer layer wrapped around silver inside, a silver-glass structure with a glass outer layer wrapped around silver inside, and a silver-aluminum structure with an aluminum outer layer wrapped around silver inside.
[0063] Specifically, in the present application, the outer shell 31 is made of polymethyl methacrylate material. The displacement medium 32 is any one of n-hexane, ethyl acetate, chloroform and dichloromethane.
[0064] In the high-temperature curing stage of the electromagnetic wave element, under the action of high temperature, the displacement medium 32 is heated and vaporized, and air is displaced into the cavity 33.
[0065] In the present application, the diameter of the cavity 33 is less than or equal to 0.3 times the wavelength of the target electromagnetic wave.
[0066] When the diameter of the closed cavity 33 is less than 0.3 times the wavelength of the target electromagnetic wave, the target electromagnetic wave usually cannot effectively penetrate the cavity 33. This is because when the wavelength of the electromagnetic wave is larger than the size of the cavity 33, the electromagnetic wave will be reflected and diffracted in the cavity 33, resulting in its inability to penetrate. In particular, when the size of the cavity 33 is less than a certain proportion, such as 0.3 times, of the wavelength, the electromagnetic wave will be significantly attenuated.
[0067] Taking the electromagnetic wave of 79GHz as an example, the wavelength is 3.8mm, when the diameter of the cavity 33 is less than the target 0.3*3.8=0.114mm, the electromagnetic wave of 79GHz cannot penetrate the closed cavity 33 with a diameter less than or equal to 0.114mm, so that the electromagnetic wave shielding element has the function of absorbing electromagnetic waves.
[0068] When the electromagnetic wave shielding element is arranged at the preset position, the electromagnetic wave shielding element is compressed by the components on both sides, and at this time, the compression rate of the electromagnetic wave shielding element is 10%-20%, after the electromagnetic wave shielding element is compressed, the diameter of the cavity 33 is less than 0.3 times the wavelength of the target electromagnetic wave, which further prevents the electromagnetic wave from penetrating the cavity 33.
[0069] In an embodiment of the present application, the outer shell 31 has a diameter less than or equal to 40 microns.
[0070] Since the cavity 33 is arranged in the outer shell 31 and has a diameter smaller than that of the outer shell 31, when the outer shell 31 has a diameter less than or equal to 40 microns, the diameter of the cavity 33 inside the outer shell 31 is much smaller than 40 microns, and the electromagnetic waves of multiple wavelengths can be diffracted in the cavity 33 when passing through the micropores, so that they cannot penetrate, thereby realizing the function of absorbing electromagnetic waves of multiple wavelengths.
[0071] In the present application, since the silica gel substrate is in a liquid state, it can be made into a sheet or a strip by any one of injection molding, coating molding, mold pressing, extrusion molding or dispensing molding according to the needs.
[0072] When the liquid silica gel substrate 10 is made into a sheet structure, its shape can be made into a desired shape, such as a triangle, a rectangle or a circle according to the needs. When the liquid silica gel substrate 10 is made into a strip structure, its shape can be a long strip structure, or a ring structure, and can be made into a shape suitable for the use place according to the needs.
[0073] In the present application, please refer to Figures 6 to 8 When the preset shape is a strip, the shape of the cross section of the preset shape is any one of a trapezoidal shape, an n-shaped, a D-shaped or a triangular shape, or can be processed into a shape suitable for the use place according to the needs.
[0074] In the present application, since the microspherical shell-core structure 30 with a shell-core structure 30 of 33 is filled in the liquid silicone base 10, by adjusting the proportion of the microspherical shell-core structure 30 in the liquid silicone base 10, the density of the electromagnetic wave shielding element can be located at 1.3-1.8 g / cm. For example, when the microspherical shell-core structure 30 is filled in the liquid silicone base 10 with the maximum proportion, since part of the silicone base in the liquid silicone base 10 is replaced by more cavities 33, the density of the electromagnetic wave shielding element is 1.4 g / cm. For example, when the microspherical shell-core structure 30 is filled in the liquid silicone base 10 with the minimum proportion, the density of the electromagnetic wave shielding element is 1.75 g / cm.
[0075] Compared with the electromagnetic wave shielding element in the prior art without filling the microspherical shell-core structure 30 in the inside, the electromagnetic wave shielding element provided by the present application has a lower mass, so that the electronic product using the electromagnetic wave shielding element can be lightened.
[0076] In the present application, the compression rate of the electromagnetic wave shielding element is located at 10%-60%.
[0077] In the present application, since the liquid silicone base 10 has elasticity after being cured, and the microspherical shell-core structure 30 is also made of elasticity, after the liquid silicone base 10 is cured into a predetermined shape, the electromagnetic wave shielding element can be compressed.
[0078] When the volume of the electromagnetic wave shielding element is compressed, the conductive contact between the shell-core structure conductive powder 20 in the inside is more easily formed, the electromagnetic wave shielding element is improved, and the diameter of the microspherical shell-core structure 30 and the volume of the cavity 33 in the inside are also compressed. For example, when the volume of the electromagnetic wave shielding element is compressed by 10%, the diameter of the microspherical shell-core structure 30 and the volume of the cavity 33 in the inside are also compressed by 10%, at this time, the diameter of the cavity 33 in the inside of the microspherical shell-core structure 30 is further compressed, and the electromagnetic wave shielding element is further improved to realize the wave absorption function for electromagnetic waves of various wavelengths.
[0079] Table 1: The compression stress in the inside of the electromagnetic wave shielding element of different sizes at different compression processes when the shell-core structure conductive powder 20 is a nickel-carbon structure in the present application;
[0080]
[0081]
[0082] Table 2: The compression stress in the inside of the electromagnetic wave shielding element of different sizes at different compression processes when the shell-core structure conductive powder 20 is a nickel-carbon structure in the prior art;
[0083]
[0084] As can be seen from Table 1 and Table 2, compared with the prior art electromagnetic wave shielding element in which only the core-shell structure conductive powder 20 is filled in the silica gel base, the compression stress inside the electromagnetic wave shielding element of different sizes provided by the present application is smaller than the compression stress inside the electromagnetic wave shielding element of the same size and the same compression degree in the prior art. Since the smaller the compression stress inside the electromagnetic wave shielding element is under different compression degrees, the stronger the deformation ability of the electromagnetic wave shielding element is, the higher the plasticity is, and the better the toughness and ductility are, therefore, the deformation ability, plasticity, toughness and ductility of the electromagnetic wave shielding element provided by the present application are all superior to those of the electromagnetic wave shielding element in the prior art. Therefore, the electromagnetic wave shielding element provided by the present application can adapt to greater stress and is not prone to rupture.
[0085] Table 3: The internal resistance of the electromagnetic wave shielding element of different sizes provided by the present application when the core-shell structure conductive powder 20 is nickel-carbon structure under different compression degrees;
[0086]
[0087]
[0088] As can be seen from Table 3, under the same size, as the compression rate increases, the resistance value of the electromagnetic wave shielding element provided by the present application decreases, and the core-shell structure conductive powder 20 is more likely to form conductive contact after the electromagnetic wave shielding element is compressed, thereby improving the conductivity of the electromagnetic wave shielding element and the shielding performance of the electromagnetic wave.
[0089] It should be noted that when the core-shell structure conductive powder 20 is silver-copper, silver-nickel or silver-aluminum structure, the resistance value is smaller than that when the core-shell structure conductive powder 20 is nickel-carbon structure.
[0090] Please refer to Figure 10 , Figure 10 for example, the core-shell structure conductive powder 20 is nickel-carbon structure, and H: 1.6 mm. The vertical axis is SE (Shielding Effectiveness, electromagnetic shielding rate), and the horizontal axis is the compression rate of the electromagnetic wave shielding element. As can be seen from Figure 10 , under the same size, as the compression rate of the electromagnetic wave shielding element increases, the electromagnetic shielding rate of the electromagnetic wave shielding element gradually increases.
[0091] Compared with the prior art, the electromagnetic wave shielding element provided by the application has the beneficial effects that:
[0092] 1. The microsphere shell-core structure 30 is filled into the liquid silicone base 10, and the cavity 33 is formed in the microsphere shell-core structure 30 after heating, so that the density of the electromagnetic wave shielding element is reduced, the density of the electromagnetic wave shielding element is 1.3-1.8 g / cm compared with the prior art, and the mass of the electromagnetic wave shielding element is reduced, so that the electronic product using the electromagnetic wave shielding element is lightened.
[0093] 2. The microsphere shell-core structure 30 is filled into the liquid silicone base 10, and the mutual distribution between the structure particles of the shell-core structure conductive powder 20 is not affected, the outer shell 31 of the microsphere shell-core structure 30 is made of elastic material, and the cavity 33 is formed in the microsphere shell-core structure 30 after heating, the electromagnetic wave shielding element is more easily compressed, and the shell-core structure conductive powder 20 is more easily formed after compression, the conductivity of the electromagnetic wave shielding element is improved, the resistance of the electromagnetic wave shielding element is reduced, the shielding performance of the electromagnetic wave is improved, and the compression stress in the electromagnetic wave shielding element is lower than that in the prior art, so that the electromagnetic wave shielding element is adapted to the use environment with low compression stress in the automobile electronic element.
[0094] 3. The outer shell 31 of the microsphere shell-core structure 30 is elastic, and the liquid silicone base 10 is cured and formed, and has the characteristics of low density and small compression stress, when the compression rate of the electromagnetic wave shielding element is between 10% and 60%, the electromagnetic wave shielding element still has good resilience, so that the electromagnetic wave shielding element is not easy to produce permanent deformation, and the electromagnetic wave shielding element is not easy to crack and short circuit.
[0095] 4. The outer shell 31 of the microsphere shell-core structure 30 is elastic, and the liquid silicone base 10 is cured and formed, and has the characteristics of low density and small compression stress, when the compression rate of the electromagnetic wave shielding element is between 10% and 60%, the electromagnetic wave shielding element still has good resilience, so that the electromagnetic wave shielding element is not easy to produce permanent deformation, and the electromagnetic wave shielding element is not easy to crack and short circuit.
[0096] 5. Since the microsphere shell-nucleus structure 30 forms a closed cavity 33 inside after heating, the impedance of the electromagnetic wave shielding element is changed after the microspheres are filled into the liquid silicone base 10, so that the electromagnetic wave shielding element also has the function of absorbing electromagnetic waves;
[0097] 6. Since the microsphere shell-nucleus structure 30 forms a closed cavity 33 inside after heating, compared with the existing open-cell foam structure, liquid and gas cannot penetrate the electromagnetic wave shielding element, so that the electromagnetic wave shielding element has wider applicability, and the microsphere shell-nucleus structure 30 forms a closed cavity 33 inside with a certain volume, and the shell body 31 of the microsphere shell-nucleus structure 30 is made of elastic material, so that the diameter of the microsphere shell-nucleus structure 30 can be adjusted by heating, and since the cavity 33 contains gas, the microsphere shell-nucleus structure 30 recovers well in shape after being compressed, so that the appearance of the electromagnetic wave shielding element will not be deformed obviously.
[0098] In a second aspect, the present application provides an electromagnetic wave shielding device, comprising the electromagnetic wave shielding element provided in any one of the above embodiments.
[0099] The electromagnetic wave shielding element is arranged at the gap of the electromagnetic wave shielding device to electromagnetically shield and absorb electromagnetic waves at the gap of the electromagnetic wave shielding device, thereby improving the shielding effect of the electromagnetic wave shielding device on electromagnetic waves.
[0100] It should be noted that the electromagnetic wave shielding device can be used to shield electromagnetic waves for various communication base stations, mobile phones or intelligent automobile driving controllers.
[0101] Compared with the prior art, the electromagnetic wave shielding device provided by the present application comprises the electromagnetic wave shielding element provided in any one of the above embodiments, and has the same beneficial effects as the electromagnetic wave shielding element, which will not be described here.
[0102] The above is only a preferred embodiment of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An electromagnetic wave shielding element, characterized by, The electromagnetic wave shielding element comprises: a liquid silicone base capable of being processed into a preset shape; a shell-core structure conductive powder mixed in the liquid silicone base and uniformly distributed in the liquid silicone base; a microsphere shell-core structure mixed in the liquid silicone base and uniformly distributed in the liquid silicone base to replace part of the liquid silicone base in the liquid silicone base; the microsphere shell-core structure comprises an outer shell and a replacement medium filled in the outer shell, the replacement medium is used to form an inner core structure of the microsphere shell-core structure, the outer shell is made of an elastic material, and the replacement medium is used to place air in the outer shell after being vaporized at high temperature to form a closed cavity in the outer shell; wherein, the shell-core structure conductive powder is used to shield electromagnetic waves, and the microsphere shell-core structure is used to change the impedance of the electromagnetic wave shielding element.
2. The electromagnetic wave shielding element according to claim 1, characterized by The outer shell is made of polymethyl methacrylate.
3. The electromagnetic wave shielding element according to claim 2, characterized by The replacement medium is any one of n-hexane, ethyl acetate, chloroform and dichloromethane.
4. The electromagnetic wave shielding element according to claim 3, characterized by The diameter of the cavity is less than or equal to 0.3 times the wavelength of the target electromagnetic wave.
5. The electromagnetic wave shielding element according to claim 4, characterized by The diameter of the outer shell is less than or equal to 40 microns.
6. The electromagnetic wave shielding element according to claim 1 or 5, characterized by The preset shape is in the form of a sheet or a strip.
7. The electromagnetic wave shielding element according to claim 6, characterized by When the preset shape is in the form of a strip, the cross-sectional shape of the preset shape is any one of a trapezoidal shape, an n-shaped, a D-shaped or a triangular shape.
8. The electromagnetic wave shielding element according to claim 1, characterized by The density of the electromagnetic wave shielding element is 1.3 to 1.8 g / cm .
9. The electromagnetic wave shielding element according to claim 1, characterized by The compression rate of the electromagnetic wave shielding element is 10% to 60%.
10. An electromagnetic wave shielding apparatus, characterized by comprising: The electromagnetic wave shielding element comprises: The electromagnetic wave shielding element is any one of claims 1-9.