Bondable electromagnetic shielding composite foam board and navigation model

Abstract

The utility model relates to the technical field of electromagnetic shielding materials, and provides a bondable electromagnetic shielding composite foam board and a navigation model. The bondable electromagnetic shielding composite foam board comprises a release paper layer, an epoxy resin layer and a polyurethane foam shielding layer, and the polyurethane foam shielding layer is made by a foaming technology; wherein the epoxy resin layer is clamped between the polyurethane foam shielding layer and the release paper layer, and the release paper layer is attached to the lower surface of the epoxy resin layer. According to the bondable electromagnetic shielding composite foam board and the navigation model, the density of the material can be further reduced by adopting the foaming polyurethane and introducing the foam holes, the shielding performance is improved through multiple reflection and absorption of the foam holes to electromagnetic waves, and the potential application field of the electromagnetic shielding material is widened.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding materials technology, and in particular to an adhesive electromagnetic shielding composite foam board and a nautical model. Background Technology

[0002] In related technologies, various types of remote-controlled boats are used in youth aviation and marine model competitions. These boats often need to be shielded from external electromagnetic interference during competitions, especially mutual interference between competing boats in the same waters; they also need to avoid electromagnetic interference between the various electronic components inside the boat. Existing electromagnetic shielding materials are often dense and heavy, making them unsuitable for small competition boats. Furthermore, waterproofing is a consideration when the boats are traveling at high speeds during competitions.

[0003] Traditional metallic electromagnetic interference (EMI) shielding materials, while possessing excellent electromagnetic shielding performance, suffer from drawbacks such as poor flexibility, high density, difficulty in processing, and susceptibility to corrosion, making them unsuitable for the demands of modern miniaturized electronic devices. Therefore, a new type of EMI shielding material that meets these requirements is urgently needed. Polymer-based EMI shielding composites have attracted widespread attention due to their high flexibility, ease of processing, and adjustable shielding performance. However, achieving high EMI shielding performance often requires the addition of large amounts of fillers, leading to increased composite density, reduced mechanical properties, increased processing difficulty, and higher manufacturing costs, thus limiting their wider application. Utility Model Content

[0004] This invention provides an adhesive electromagnetic shielding composite foam board and a nautical model to address the shortcomings of existing technologies and achieve the following technical effects: It uses foamed polyurethane, and the introduction of foam cells can further reduce the density of the material. The shielding performance is improved by absorbing electromagnetic waves through multiple reflections of the foam cells, thus broadening the potential application areas of electromagnetic shielding materials.

[0005] According to a first aspect of the present invention, an adhesive electromagnetic shielding composite foam board includes a release paper layer, an epoxy resin layer, and a polyurethane foam shielding layer, wherein the polyurethane foam shielding layer is made by foaming technology.

[0006] The epoxy resin layer is sandwiched between the polyurethane foam shielding layer and the release paper layer, and the release paper layer is attached to the lower surface of the epoxy resin layer.

[0007] According to one embodiment of the present invention, the polyurethane foam shielding layer has a multi-component microwave absorbing agent uniformly distributed inside.

[0008] According to one embodiment of the present invention, the thickness of the polyurethane foam shielding layer is 1mm-10mm.

[0009] According to one embodiment of the present invention, the epoxy resin layer is composed of E20 epoxy resin and a multi-component microwave absorbing agent.

[0010] According to one embodiment of the present invention, the mixing process of the epoxy resin layer adopts a method of first diluting the multi-component microwave absorber with a diluent, and then adding E20 epoxy resin and dispersing it at high speed.

[0011] According to one embodiment of the present invention, the thickness of the epoxy resin layer is 5μm-100μm.

[0012] According to one embodiment of the present invention, the multi-component microwave absorbing agent is iron-based polydopamine nanoparticles.

[0013] According to one embodiment of the present invention, the release paper layer is a single-sided release paper.

[0014] According to one embodiment of the present invention, the thickness of the release paper layer is 70μm-200μm.

[0015] According to a second aspect of the present invention, a nautical model includes an adhesive electromagnetic shielding composite foam board and a model body as described in a first aspect of the present invention, wherein the electromagnetic shielding composite foam board is used to be bonded to the bottom of the model body after the release paper layer is torn off.

[0016] This invention provides an adhesive electromagnetic shielding composite foam board, which uses foamed polyurethane. The introduction of foam cells can further reduce the density of the material, and the shielding performance can be improved by absorbing multiple reflections of electromagnetic waves through the foam cells, thus broadening the potential application areas of electromagnetic shielding materials.

[0017] In addition, the electromagnetic shielding composite foam board of this invention has the following additional advantages.

[0018] (1) Lightweight: Since polyurethane foam is used as the base material for the shielding layer, this material itself is relatively lightweight. In addition, the application of foaming technology makes the entire composite foam board lighter and easier to transport and install.

[0019] (2) Easy to install: Due to the presence of the release paper layer, the composite foam board has a self-adhesive function. During the installation process, only the release paper layer needs to be removed, and the side with the epoxy resin layer can be directly pasted onto the target surface, simplifying the installation steps.

[0020] (3) Enhanced shielding effect: The polyurethane foam shielding layer contains a variety of absorbers that are evenly distributed inside. These absorbers can effectively absorb electromagnetic waves, rather than just reflecting them. This not only reduces electromagnetic wave reflection interference, but also reduces the penetration rate of electromagnetic waves in the shielding material, thereby improving the shielding efficiency.

[0021] (4) Good mechanical properties: The foaming technology gives polyurethane foam good flexibility and elasticity, which means that the composite foam board is not easily damaged when subjected to external force and has better durability.

[0022] (5) Waterproof function: Since epoxy resin is used as the intermediate layer, this material usually has good waterproof properties. Therefore, the entire composite foam board also has a waterproof function and can be used in a humid environment without affecting the shielding performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of the adhesive electromagnetic shielding composite foam board provided by this utility model.

[0025] Figure label:

[0026] 1. Polyurethane foam shielding layer; 2. Epoxy resin layer; 3. Release paper layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0030] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] The following description, with reference to the accompanying drawings, introduces an adhesive electromagnetic shielding composite foam board and a nautical model based on this invention. It should be noted that the electromagnetic shielding composite foam board of this invention, after removing the release paper layer 3, can be adhered to the bottom of the nautical model's body, thereby eliminating the back-and-forth reflection of electromagnetic waves within the nautical model, reducing interference from clutter on its own equipment, and greatly improving the stability and anti-interference capabilities of the nautical model's equipment during competitions.

[0032] like Figure 1 As shown, the adhesive electromagnetic shielding composite foam board according to the first aspect of the present invention includes a release paper layer 3, an epoxy resin layer 2, and a polyurethane foam shielding layer 1.

[0033] The polyurethane foam shielding layer 1 is made by foaming technology, the epoxy resin layer 2 is sandwiched between the polyurethane foam shielding layer 1 and the release paper layer 3, and the release paper layer 3 is attached to the lower surface of the epoxy resin layer 2.

[0034] It is understood that the electromagnetic shielding composite foam board provided by this utility model is mainly composed of three parts: release paper layer 3, epoxy resin layer 2 and polyurethane foam shielding layer 1.

[0035] Specifically, release paper layer 3 is the outermost layer, and its main function is to protect the underlying epoxy resin layer 2 from contamination or damage before installation. Before actual application, the user will peel off this layer to expose the adhesive layer. Release paper layer 3 is typically disposable and removed before use.

[0036] The epoxy resin layer 2 is sandwiched between the release paper layer 3 and the polyurethane foam shielding layer 1. It not only acts as an adhesive but also bonds the microwave absorbing material to the polyurethane foam. The epoxy resin layer 2 is formed by mixing E20 epoxy resin with a microwave absorbing agent (such as iron-based polydopamine nanoparticles), which is pre-diluted and then rapidly dispersed with the epoxy resin. This design gives the epoxy resin layer 2 excellent adhesion and effectively absorbs electromagnetic waves.

[0037] The polyurethane foam shielding layer 1 is the core component of the composite foam board. It is manufactured using foaming technology and contains microwave-absorbing materials distributed within it. Polyurethane foam itself is lightweight, and the foaming technology further reduces its density while increasing the material's flexibility and elasticity. The added microwave-absorbing materials can absorb and reflect electromagnetic waves, thereby achieving an electromagnetic shielding effect.

[0038] These three layers are stacked in a specific order: release paper layer 3 is on the outermost side, followed by epoxy resin layer 2, and finally polyurethane foam shielding layer 1. When release paper layer 3 is removed, epoxy resin layer 2 is exposed, allowing polyurethane foam shielding layer 1 to be bonded to the surface requiring electromagnetic shielding. In this way, the electromagnetic shielding composite foam board can effectively absorb and shield electromagnetic interference from the external environment, providing a relatively stable electromagnetic environment for electronic devices.

[0039] In related technologies, various types of remote-controlled boats are used in youth aviation and marine model competitions. These boats often need to be shielded from external electromagnetic interference during competitions, especially mutual interference between competing boats in the same waters; they also need to avoid electromagnetic interference between the various electronic components inside the boat. Existing electromagnetic shielding materials are often dense and heavy, making them unsuitable for small competition boats. Furthermore, waterproofing is a consideration when the boats are traveling at high speeds during competitions.

[0040] Traditional metallic electromagnetic interference (EMI) shielding materials, while possessing excellent electromagnetic shielding performance, suffer from drawbacks such as poor flexibility, high density, difficulty in processing, and susceptibility to corrosion, making them unsuitable for the demands of modern miniaturized electronic devices. Therefore, a new type of EMI shielding material that meets these requirements is urgently needed. Polymer-based EMI shielding composites have attracted widespread attention due to their high flexibility, ease of processing, and adjustable shielding performance. However, achieving high EMI shielding performance often requires the addition of large amounts of fillers, leading to increased composite density, reduced mechanical properties, increased processing difficulty, and higher manufacturing costs, thus limiting their wider application.

[0041] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, this utility model provides an adhesive electromagnetic shielding composite foam board, which adopts foamed polyurethane. The introduction of foam cells can further reduce the density of the material, and improve the shielding performance through the multiple reflection absorption of electromagnetic waves by the foam cells, thus broadening the potential application fields of electromagnetic shielding materials.

[0042] In addition, the electromagnetic shielding composite foam board of this invention has the following additional advantages.

[0043] (1) Lightweight: Since polyurethane foam is used as the base material for the shielding layer, this material itself is relatively lightweight. In addition, the application of foaming technology makes the entire composite foam board lighter and easier to transport and install.

[0044] (2) Easy to install: Due to the presence of the release paper layer 3, the composite foam board has a self-adhesive function. During the installation process, only the release paper layer 3 needs to be removed, and the side with the epoxy resin layer 2 can be directly pasted onto the target surface, simplifying the installation steps.

[0045] (3) Enhanced shielding effect: The polyurethane foam shielding layer 1 contains a variety of absorbers that are uniformly distributed inside. These absorbers can effectively absorb electromagnetic waves instead of just reflecting them. This not only reduces electromagnetic wave reflection interference but also reduces the penetration rate of electromagnetic waves in the shielding material, thereby improving the shielding efficiency.

[0046] (4) Good mechanical properties: The foaming technology gives polyurethane foam good flexibility and elasticity, which means that the composite foam board is not easily damaged when subjected to external force and has better durability.

[0047] (5) Waterproof function: Since epoxy resin is used as the intermediate layer, this material usually has good waterproof properties. Therefore, the entire composite foam board also has a waterproof function and can be used in a humid environment without affecting the shielding performance.

[0048] In summary, the electromagnetic shielding composite foam board provided by this utility model has significant advantages over traditional electromagnetic shielding materials in practical applications due to its lightweight, easy installation, high-efficiency shielding performance, good mechanical properties, and waterproof characteristics.

[0049] According to some embodiments of the present invention, the polyurethane foam shielding layer 1 is made by foaming technology, and its interior is uniformly distributed with multiple components of microwave absorbing agent.

[0050] Specifically, the multi-component microwave absorbing agent can be iron-based polydopamine nanoparticles (Fe3O4@PDA), which have microwave absorption performance that achieves a bandwidth of 4GHz in the 2-18GHz frequency band.

[0051] This polyurethane foam shielding layer 1 is designed to improve the material's electromagnetic shielding performance while maintaining a low density. The numerous micro-cells created by the foaming technology not only reduce the material's weight but also enhance the absorption and reflection of electromagnetic waves, thereby improving the shielding effect. By adding multi-component absorbing materials and magnetic particles to the polyurethane foam, the material can effectively absorb electromagnetic waves and reduce electromagnetic interference. Furthermore, this material maintains good electromagnetic shielding performance even with low filler content, indicating its great potential in practical applications, especially for those requiring lightweight and efficient electromagnetic shielding solutions.

[0052] According to some embodiments of the present invention, the thickness of the polyurethane foam shielding layer 1 is 1mm-10mm. Further, the thickness of the polyurethane foam shielding layer 1 is preferably 1mm-7mm, more preferably 1mm-6mm, even more preferably 2mm-5mm, and most preferably 3mm-4mm.

[0053] It is understandable that the above design takes into account various factors, such as the shielding efficiency of the material, weight control, cost-effectiveness, and convenience in practical applications. Choosing an appropriate thickness can balance these factors according to specific usage requirements to achieve the best electromagnetic shielding effect.

[0054] According to some embodiments of the present invention, the epoxy resin layer 2 is composed of E20 epoxy resin and a multi-component microwave absorbing agent.

[0055] Furthermore, the mixing process of epoxy resin layer 2 adopts a method of first diluting the multi-component microwave absorber with a diluent, and then adding E20 epoxy resin and dispersing it at high speed.

[0056] In this embodiment, the epoxy resin layer 2 is composed of E20 epoxy resin and a multi-component microwave absorbing agent. To prepare the epoxy resin layer 2, the multi-component microwave absorbing agent (such as iron-based polydopamine nanoparticles) is first diluted with a diluent. Then, the diluted microwave absorbing agent is added to the E20 epoxy resin, and high-speed dispersion is used to ensure uniform distribution of the microwave absorbing agent within the epoxy resin. This method ensures uniform distribution of the microwave absorbing agent in the final product, thereby guaranteeing the shielding effectiveness of the electromagnetic shielding composite foam board.

[0057] According to some embodiments of the present invention, the thickness of the epoxy resin layer 2 is 5μm-100μm. Further, the thickness of the epoxy resin layer 2 is preferably 15μm-25μm, and most preferably 20μm.

[0058] Understandably, this thickness design takes into account both the bonding strength and microwave absorption performance of the epoxy resin layer 2, while also meeting the lightweight requirements of the overall composite foam board. The 20μm thickness ensures sufficient adhesion while maintaining good microwave absorption and material portability.

[0059] According to some embodiments of this utility model, the multi-component microwave absorbing agent is iron-based polydopamine nanoparticles.

[0060] Furthermore, the preparation method of iron-based polydopamine nanoparticles is as follows: Tris(hydroxymethyl)aminomethane (Tris) is added to an aqueous solution of nano-Fe3O4 and stirred. Then, dopamine hydrochloride (DA) is added to the above solution and stirred at room temperature. Fe3O4@PDA nanoparticles after wet reaction are obtained by magnetic separation. Then, they are washed with deionized water and dried in an oven to obtain iron-based polydopamine nanoparticles.

[0061] This preparation method utilizes the self-polymerization property of dopamine under alkaline conditions and the magnetic properties of Fe3O4 nanoparticles, enabling polydopamine (PDA) to polymerize in situ on the Fe3O4 surface, thereby forming Fe3O4@PDA nanoparticles with microwave absorption properties. These nanoparticles can be used to enhance the electromagnetic wave absorption capability of composite materials, thereby improving the electromagnetic shielding effect.

[0062] Furthermore, the preparation method of polyurethane foam shielding layer 1 is as follows: the above Fe3O4@PDA nanoparticles are added to deionized water, triethanolamine, foam stabilizer and polyether polyol and mixed evenly. Then, stannous octoate is added and dispersed evenly. After adding isocyanate and stirring, it is poured into a mold and pressure is applied to allow it to foam freely. Finally, the mold is placed in an oven to complete the curing and obtain polyurethane porous electromagnetic shielding material.

[0063] Thus, the preparation of polyurethane foam shielding layer 1 optimizes the electromagnetic shielding performance of the material by introducing multi-component microwave absorbing agent Fe3O4@PDA nanoparticles. At the same time, the foaming technology is used to create a porous structure with low density, which helps to improve the microwave absorption capacity of the material and reduce the overall weight of the material.

[0064] It is understandable that iron-based polydopamine multi-component absorbing materials can achieve a bandwidth of 4 GHz within the 2-18 GHz range. Therefore, this material performs well in electromagnetic wave absorption, capable of absorbing electromagnetic waves over a wide frequency range and reducing electromagnetic interference. This is particularly important for applications requiring efficient electromagnetic shielding, such as in model nautical competitions, where it can help reduce electromagnetic interference between ships and improve the stability and anti-interference capabilities of the competition equipment.

[0065] According to some embodiments of the present invention, the release paper layer 3 is a single-sided release paper.

[0066] The design of the single-sided release paper layer 3 allows the composite foam board to be easily adhered to the desired surface by peeling off the release paper to activate the adhesive layer (i.e., the epoxy resin layer 2). This design not only simplifies the installation process but also ensures the reliability and stability of the adhesion.

[0067] According to some embodiments of the present invention, the thickness of the release paper layer 3 is 70μm-200μm. Further, the thickness of the release paper layer 3 is preferably 110μm-140μm, more preferably 120μm-130μm, and most preferably 125μm.

[0068] Understandably, this thickness setting ensures that the release paper layer 3 provides sufficient protection while being easily peeled off during use, without causing inconvenience to the final product.

[0069] like Figure 1 As shown, the nautical model according to the second aspect of the present invention includes an adhesive electromagnetic shielding composite foam board and a model body as described in the first aspect of the present invention, wherein the electromagnetic shielding composite foam board is used to be bonded to the bottom of the model body after the release paper layer 3 is torn off.

[0070] This utility model of a nautical model comprises two parts: a special electromagnetic shielding composite foam board and the model body. The electromagnetic shielding composite foam board includes a release paper layer 3, an epoxy resin layer 2, and a polyurethane foam shielding layer 1. During installation, the user needs to first remove the release paper layer 3, and then adhere the side with the epoxy resin layer 2 to the bottom of the model body. The purpose of this is to utilize the electromagnetic shielding and wave-absorbing properties of the composite foam board to provide effective electromagnetic interference protection for the nautical model, especially during competitions, to prevent interference between boats or between electronic components inside the boat. This improves the stability and anti-interference capability of the nautical model's equipment operation during competitions.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adhesive electromagnetic shielding composite foam board, characterized in that, It includes a release paper layer, an epoxy resin layer, and a polyurethane foam shielding layer, wherein the polyurethane foam shielding layer is made by foaming technology; The epoxy resin layer is sandwiched between the polyurethane foam shielding layer and the release paper layer, and the release paper layer is attached to the lower surface of the epoxy resin layer.

2. The adhesive electromagnetic shielding composite foam board according to claim 1, characterized in that, The polyurethane foam shielding layer has multiple components of microwave absorbing agent evenly distributed inside.

3. The adhesive electromagnetic shielding composite foam board according to claim 1, characterized in that, The thickness of the polyurethane foam shielding layer is 1mm-10mm.

4. The adhesive electromagnetic shielding composite foam board according to claim 1, characterized in that, The thickness of the epoxy resin layer is 5μm-100μm.

5. The adhesive electromagnetic shielding composite foam board according to claim 2, characterized in that, The multi-component microwave absorber is iron-based polydopamine nanoparticles.

6. The adhesive electromagnetic shielding composite foam board according to any one of claims 1 to 4, characterized in that, The release paper layer is a single-sided release paper.

7. The adhesive electromagnetic shielding composite foam board according to claim 6, characterized in that, The thickness of the release paper layer is 70μm-200μm.

8. A nautical model, characterized in that, The invention includes an adhesive electromagnetic shielding composite foam board and a model body as described in any one of claims 1 to 7, wherein the electromagnetic shielding composite foam board is used to be bonded to the bottom of the model body after the release paper layer is torn off.

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