Flexible and pressure-resistant multi-layer flat plate wave-absorbing material structure
By forming a layer-by-layer thickening conductive layer of carbon nanotubes on the EVA foam board, combined with adhesive bonding, the problem of traditional absorbent materials being unable to bear loads is solved, and multi-layers of flexibility, pressure resistance and wide-band characteristics are achieved Absorbent material, suitable for load-bearing applications and provides flexibility in decorative layers.
Patent Information
- Application Number
- CN202421067297.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-16
AI Technical Summary
Traditional flat-panel absorbing materials cannot bear load due to the use of soft polyurethane sponges, which limits their use in applications requiring load bearing.
The EVA foam plate with a multi-layer structure and the thickened carbon nanotube water-based conductive layer form different resistance gradients, and bonded with adhesive to form a wave absorbing material with flexibility and pressure resistance.
It realizes the flexibility, shock resistance and pressure resistance of the material, meets the requirements of wideband applications, and is suitable for scenarios where load bearing is required, while providing flexible decorative layer selection.
Smart Images
Figure CN222246451U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wave-absorbing materials, in particular to a multi-layer flat wave-absorbing material structure which is flexible and pressure-resistant. Background Art
[0002] Flat-type absorbing materials are usually used in the corners of darkrooms and microwave darkrooms; flat-type absorbing materials can also be used in radars, antennas, and test frames to absorb clutter. In order to achieve broadband absorption, flat-type absorbing materials are usually made into multi-layer structures. Traditional flat-type absorbing materials generally use polyurethane sponges impregnated with conductive liquids to form different resistance gradients. However, the polyurethane sponges used in traditional flat-type absorbing materials are soft materials and cannot bear weight. Their applications are limited in some special scenarios. For example, traditional flat-type absorbing materials are not suitable for application scenarios that require a certain amount of load-bearing capacity, and their applications are limited. Utility Model Content
[0003] The purpose of the utility model is to propose a flexible and pressure-resistant multi-layer flat absorbing material structure to address the problem that traditional polyurethane sponge impregnated conductive liquid flat absorbing materials cannot bear weight. The material has good flexibility, shock resistance and strong pressure resistance, and at the same time meets the requirements of broadband application of flat multi-layer materials, and is suitable for application scenarios with load-bearing requirements.
[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a multi-layer flat plate absorbing material structure with flexibility and pressure resistance, including a plurality of absorbing flat plate units glued in sequence, the absorbing flat plate units including EVA foam plates (also called EVA foam plates or ethylene-vinyl acetate copolymer foam plates) and a conductive layer sprayed on the bottom of the EVA foam plates, and the conductive layers of the plurality of absorbing flat plate units gradually become thicker from top to bottom. The thicker the conductive layer, the smaller the resistance and the stronger the conductivity.
[0005] Furthermore, the resistance of the conductive layers of the multiple absorbing flat plate units decreases gradually from top to bottom, forming different resistance gradients. The matching of different resistance layers meets the broadband application requirements of the flat multilayer material.
[0006] Furthermore, the conductive layer adopts carbon nanotube water-based conductive slurry, such as the water-based conductive slurry produced by Jiangsu Tiannai Technology Co., Ltd.
[0007] Furthermore, the number of the absorbing flat plate units is 3-5. The flexible and pressure-resistant multi-layer flat plate absorbing material structure takes three absorbing flat plate units as an example: the first conductive layer is sprayed on the bottom of the first EVA foam board, the second conductive layer is sprayed on the bottom of the second EVA foam board, the third conductive layer is sprayed on the bottom of the third EVA foam board, the bottom of the first conductive layer is glued to the top of the second EVA foam board, the bottom of the second conductive layer is glued to the top of the third EVA foam board, and the thickness of the first conductive layer is less than the thickness of the second conductive layer and less than the thickness of the third conductive layer.
[0008] Further, the resistance of the first conductive layer is greater than the resistance of the second conductive layer and greater than the resistance of the third conductive layer.
[0009] Furthermore, the first conductive layer has a resistance of 1-1.5K ohms, the second conductive layer has a resistance of 500-800 ohms, and the third conductive layer has a resistance of 100-200 ohms.
[0010] Furthermore, the thickness of the EVA foam board is 5-20mm, preferably 10mm. The EVA foam board has good flexibility, shock resistance and strong pressure resistance, and is suitable for some application scenarios that require load-bearing. The EVA foam board of the above thickness is suitable for preparing multi-layer flat-plate absorbing materials of different thicknesses. Products below 30 mm are made into 3 layers with equal thickness. For example, for a 21 mm thick product, the thickness of each layer is 7 mm. For a 30 mm thick product, the thickness of each layer is 10 mm. For products thicker than 30 mm, 10 mm thick EVA foam boards are often used for stacking. For example, a 50 mm thick product is stacked by 5 layers of 10 mm thick EVA foam boards.
[0011] Further, the resistance thickness of the first conductive layer is 20-30 microns, preferably 25 microns, the thickness of the second conductive layer is 40-60 microns, preferably 50 microns, and the thickness of the third conductive layer is 80-120 microns, preferably 100 microns.
[0012] Furthermore, a decorative layer is provided on the side of the first layer of EVA foam board away from the conductive layer. The decorative layer can be in any color to meet the needs of different application scenarios.
[0013] Furthermore, the bonding adopts conventional adhesives, such as Brothers Glue.
[0014] The utility model has a flexible and pressure-resistant multi-layer flat plate absorbing material structure. The invention uses EVA foam board as the base material, sets (paints) a conductive layer on the surface of the EVA foam board to form different resistance gradients, and forms a flexible and pressure-resistant multi-layer flat plate absorbing material after bonding with an adhesive. Compared with the prior art, the utility model has the following advantages:
[0015] 1) The EVA foam board used in the main body of the present invention has good flexibility, shock resistance and strong pressure resistance, and the multi-layer flat plate absorbing material is particularly suitable for some application scenarios that require load-bearing.
[0016] 2) The resistance of the conductive layers of multiple absorbing flat plate units decreases gradually from top to bottom, forming different resistance gradients. The matching of different resistance layers meets the broadband application requirements of flat multilayer materials.
[0017] 3) A decorative layer is provided on the side of the first EVA foam board facing away from the conductive layer. The decorative layer can be in any color to meet the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a cross-sectional view of the flexible and pressure-resistant multi-layer flat-plate absorbing material structure of Example 1;
[0019] Figure 2 It is a cross-sectional view of the flexible and pressure-resistant multi-layer flat-plate absorbing material structure of Example 2. DETAILED DESCRIPTION
[0020] The present invention is further described below with reference to the embodiments: Example 1
[0021] This embodiment discloses a multi-layer flat plate absorbing material structure that is flexible and pressure-resistant, such as Figure 1 As shown, it includes three sequentially glued wave-absorbing flat plate units, the first EVA foam board bottom is sprayed with a first conductive layer 2, the second EVA foam board bottom is sprayed with a second conductive layer 3, and the third EVA foam board bottom is sprayed with a third conductive layer 4. The bottom of the first conductive layer 2 is glued to the top of the second EVA foam board, and the bottom of the second conductive layer 3 is glued to the top of the third EVA foam board. The thickness of the first conductive layer 2 is less than the thickness of the second conductive layer 3 and less than the thickness of the third conductive layer 4. The resistance of the first conductive layer 2 is greater than the resistance of the second conductive layer 3 and greater than the resistance of the third conductive layer 4. The conductive layer adopts a carbon nanotube water-based conductive slurry, specifically a water-based conductive slurry produced by Jiangsu Tiannai Technology Co., Ltd.
[0022] Specifically, the resistance of the first conductive layer is 1.2K ohms, the resistance of the second conductive layer is 600 ohms, and the resistance of the third conductive layer is 150 ohms, forming different resistance gradients. The matching of different resistance layers meets the broadband application requirements of flat multilayer materials. The resistance thickness of the first conductive layer is 25 microns, the thickness of the second conductive layer is 50 microns, and the thickness of the third conductive layer is 100 microns. The thickness of the EVA foam board 1 is 10mm. After testing, the tensile strength of the flexible and pressure-resistant multilayer flat absorbing material structure of this embodiment is 1.56Mpa, the elongation at break is 120%, and the compressive strength is 1.5Mpa. The flexible and pressure-resistant multilayer flat absorbing material structure of this embodiment has good flexibility, shock resistance and strong pressure resistance, and is suitable for some application scenarios that require load-bearing. Example 2
[0023] This embodiment discloses a multi-layer flat plate absorbing material structure that is flexible and pressure-resistant, such as Figure 2 As shown, its structure is basically the same as that of Example 1, except that a decorative layer 5 is provided on the side of the first layer of EVA foam board away from the conductive layer, and the decorative layer 5 is a camouflage layer.
[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A flexible and pressure-resistant multi-layer flat-plate absorbing material structure, characterized in that: The invention comprises a plurality of wave-absorbing flat plate units which are glued together in sequence. The wave-absorbing flat plate units comprise an EVA foam plate and a conductive layer sprayed on the bottom of the EVA foam plate. The conductive layers of the plurality of wave-absorbing flat plate units gradually become thicker from top to bottom.
2. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 1, characterized in that: The resistance of the conductive layers of the plurality of absorbing plate units decreases gradually from top to bottom.
3. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 1, characterized in that: The conductive layer adopts carbon nanotube water-based conductive slurry.
4. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 1, characterized in that: There are three absorbing flat plate units, the first conductive layer is sprayed on the bottom of the first EVA foam board, the second conductive layer is sprayed on the bottom of the second EVA foam board, and the third conductive layer is sprayed on the bottom of the third EVA foam board. The bottom of the first conductive layer is glued to the top of the second EVA foam board, and the bottom of the second conductive layer is glued to the top of the third EVA foam board. The thickness of the first conductive layer is less than the thickness of the second conductive layer and less than the thickness of the third conductive layer.
5. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 4, characterized in that: The first conductive layer has a resistance of 1-1.5K ohms, the second conductive layer has a resistance of 500-800 ohms, and the third conductive layer has a resistance of 100-200 ohms.
6. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 4, characterized in that: The EVA foam board has a thickness of 5-20 mm.
7. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 4, characterized in that: The resistance thickness of the first conductive layer is 20-30 microns, the thickness of the second conductive layer is 40-60 microns, and the thickness of the third conductive layer is 80-120 microns.
8. The flexible and pressure-resistant multi-layer flat-plate absorbing material structure according to claim 4, characterized in that: A decorative layer is arranged on the side of the first EVA foam board facing away from the conductive layer.