High-wear-resistance lightweight electromagnetic shielding composite sealing tape

Abstract

The utility model relates to a high-wear-resistance lightweight electromagnetic shielding composite sealing tape, which is of a hollow closed omega-shaped section structure and comprises a deformation main body part, a bottom mounting edge and a top edge reinforcing part which are integrally formed, from the layered structure description, the sealing tape comprises matrix silicone rubber, a conductive rubber layer, a conductive fabric layer and a polyester fabric layer, the base body silicon rubber forms a main body structure of the deformation main body part, the bottom mounting edge and the top edge reinforcing part; the conductive rubber layer covers the outer working surfaces of the deformation main body part, the top edge reinforcing part and the bottom mounting edge; the conductive fabric layer covers the outer side of the conductive rubber layer, and the conductive fabric layer and the conductive rubber layer are compounded into a whole; the polyester fabric layer is arranged in the hollow structure of the deformation main body part. The sealing tape provided by the utility model has comprehensive performances such as excellent wear resistance, electromagnetic shielding function, long-term effect and the like, meets the requirements of doors, windows and covering caps with different structures on electromagnetic shielding sealing, and has a wide application prospect in the field of electromagnetic shielding sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic shielding and sealing, in particular to an electromagnetic shielding composite sealing tape with high wear resistance and lightweight characteristics, which is suitable for scenes with high requirements for electromagnetic shielding and sealing performance such as weapon equipment, aerospace equipment and electronic systems. BACKGROUND

[0002] In the field of modern military, aerospace and high-end electronics, electromagnetic interference (EMI) and electromagnetic pulse (EMP) pose a serious threat to the normal operation of electronic devices and systems. Therefore, electromagnetic shielding is a key requirement. As an important functional component, electromagnetic shielding composite sealing tape is widely used in the structures such as doors, windows and covers of weapon equipment. It not only needs to meet the basic sealing performance such as water tightness and air tightness, but also needs to consider the electromagnetic shielding function to ensure the reliability of equipment operation.

[0003] In the existing electromagnetic shielding composite sealing tape technology, methods such as single conductive rubber, ordinary rubber and conductive rubber composite, or conductive fabric and conductive rubber composite are mainly used. For example, patent CN113980475A proposes a shielding rubber material with high strength, ductility and resilience, which can be processed into various cross-section structure products and widely used in scenes with both flexible sealing and electromagnetic shielding. Patent CN117657424A adopts a double-layer composite structure of ordinary rubber and conductive rubber, in which the non-conductive silicone rubber provides elastic sealing and the highly conductive rubber realizes electromagnetic shielding function to meet the air tightness, water tightness and electrical continuity requirements of the hatch. In addition, patent CN111065253B proposes a conductive electromagnetic shielding sealing rubber strip, the surface of which is made of wear-resistant conductive fabric and is integrally vulcanized with conductive rubber, which has good mechanical properties and waterproof function.

[0004] However, the above prior art still has obvious deficiencies in practical application. First, the sealing strip is prepared by using single conductive rubber material, which has high material cost, large product specific gravity, low physical and mechanical properties, poor processing property of conductive rubber, general wear resistance and resilience, and short service life; second, the sealing strip is prepared by using ordinary rubber and conductive rubber, which has simple forming and preparation process, and the uniformity and adhesion of the conductive rubber material after compounding can easily cause material interface peeling, resulting in poor uniformity and stability of the conductive performance, short durability, low strength of the conductive rubber material, large friction coefficient, poor wear resistance, poor applicability to full-closed complex sealing products such as doors, windows and covers of various equipment which are often opened and closed, and large shear fatigue wear which greatly reduces the performance and service life of the sealing strip; third, the sealing strip is prepared by using conductive cloth and conductive rubber integrated vulcanization compounding, which can realize electromagnetic shielding function, but has large permanent compression deformation of the conductive rubber, which leads to insufficient resilience of the sealing strip after long-term compression, resulting in sealing failure, and small elasticity and insufficient deformation of the conductive cloth, which cannot meet the requirements of large deformation working conditions.

[0005] Therefore, how to develop a light-weight, high-wear-resistant and long-term conductive stable electromagnetic shielding composite sealing strip has become a technical problem to be solved in the field of electromagnetic shielding sealing technology. SUMMARY

[0006] In order to solve the above problems, the utility model provides a high wear resistance light weight electromagnetic shielding composite sealing strip solves the problem of poor wear resistance of sealing strip, insufficient stability of conductive performance and poor environmental adaptability in prior art.

[0007] The technical scheme of the utility model is as follows:

[0008] A kind of high wear resistance light weight electromagnetic shielding composite sealing strip, the sealing strip is hollow closed Ω type cross section structure, including integrally formed deformation main part, bottom installation edge and top edge reinforcing portion;The cross section of the deformation main part is circular, and its inside is hollow structure;The bottom installation edge is arranged at the bottom of deformation main part, and the bottom installation edge extends to both sides and is arc-shaped or linear structure;The top edge reinforcing portion is arranged at the top end of deformation main part, and the top edge reinforcing portion is prismatic protrusion;

[0009] The sealing strip includes base silicone rubber, conductive rubber layer, conductive fabric layer and polyester fabric layer.

[0010] The base silicone rubber constitutes the main structure of the deformation main body part, the bottom mounting edge and the top edge reinforcing part; the conductive rubber layer is wrapped on the outer working surface of the deformation main body part, the top edge reinforcing part and the bottom mounting edge, and the conductive rubber layer is tightly combined with the base silicone rubber;

[0011] The conductive fabric layer is covered on the outside of the conductive rubber layer, and the conductive fabric layer is integrally combined with the conductive rubber layer.

[0012] The polyester fabric layer is arranged in the hollow structure of the deformation main body part, and the polyester fabric layer is integrally combined with the conductive rubber layer.

[0013] Further, the conductive rubber layer and the conductive fabric layer extend downward along the top end of the top edge reinforcing part, wrap along the outer side surface of the deformation main body part, and finally extend to the outer surface of the same side bottom mounting edge.

[0014] Further, the sealing strip further comprises a glass fiber fabric layer arranged in the bottom mounting edge, and the glass fiber fabric layer is arranged in the base silicone rubber.

[0015] Further, the conductive fabric layer is a high-elasticity polyester conductive fabric, the surface of the high-elasticity polyester conductive fabric is coated with a nickel-copper alloy, and the surface resistance of the conductive fabric layer is less than or equal to 0.5Ω.

[0016] Further, the volume resistivity of the conductive rubber layer is less than or equal to 0.01Ω·m.

[0017] Further, the sealing strip further comprises a metal framework layer embedded in the bottom mounting edge, the metal framework layer is integrally combined with the base silicone rubber, and extends along the inside of the bottom mounting edge.

[0018] Further, the top edge reinforcing part gradually reduces and increases in cross-sectional width from top to bottom, and has a wedge-shaped structure.

[0019] Further, the thickness of the composite conductive layer formed by the conductive rubber layer and the conductive fabric layer ranges from 0.2mm to 2mm.

[0020] Further, the overall shape of the sealing strip is a closed ring shape.

[0021] Further, the overall shape of the sealing strip is a circular ring structure or a circular rectangular structure.

[0022] The utility model discloses the beneficial effect lies in:

[0023] The utility model discloses a sealing band adopts the hollow closed omega section structure, including deformation main part, bottom installation edge and top edge reinforcing part, and each part is integrally formed, the deformation main part section is round, and the inside is hollow design, can effectively reduce the overall weight of sealing band, and enhances its resilience, guarantees the stability of sealing effect, the bottom installation edge is located at the bottom of deformation main part, and the arc or linear structure is extended to two sides, to adapt to different installation demand, improves the adhesion and sealing reliability in the installation process simultaneously, top edge reinforcing part sets up at the top of deformation main part, and the ridge protrusion is presented, through the unique wedge section design, has optimized the stress distribution, has strengthened the compression resistance and structure rigidity, is applicable to a variety of high strength use environment.

[0024] The utility model discloses a sealing band adopts multilayer composite structure, and the base material selects silicon rubber, constitutes the main structure of deformation main part, bottom installation edge and top edge reinforcing part, has excellent elasticity and durability, the outer layer working surface covers the conductive rubber layer and conductive fabric layer, and the conductive rubber layer is tightly covered in the outer surface of base silicon rubber, and is closely combined with it, provides good electromagnetic shielding performance and wear resistance, and the conductive fabric layer is further covered in the outside of conductive rubber layer, and is integrated with conductive rubber layer, and the electromagnetic shielding effect and environmental resistance of sealing band are significantly enhanced, in addition, the hollow structure inside sealing band is provided with polyester fabric layer, and the bottom installation edge is embedded with glass fiber fabric layer, and the addition of these reinforcing materials effectively improves the tensile resistance, resilience and fatigue resistance of sealing band, and provides guarantee for the stability of sealing band under complex use conditions.

[0025] Of course, implementing each technical scheme of the utility model does not necessarily need to achieve all the advantages mentioned above at the same time. DRAWINGS

[0026] Figure 1 It is the whole structure schematic diagram of the utility model embodiment sealing band;

[0027] Figure 2 It is the cross section structure schematic diagram of the utility model embodiment sealing band;

[0028] Figure 3 It is the layered structure schematic diagram of the utility model embodiment sealing band;

[0029] The components represented by the reference signs in the drawings are:

[0030] 1-deformation main part, 2-bottom installation edge, 3-top edge reinforcing part, 4-base silicon rubber, 5-conductive rubber layer, 6-conductive fabric layer, 7-polyester fabric layer, 8-glass fiber fabric layer. CONCRETE IMPLEMENTATION

[0031] For the convenience of understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0032] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0033] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] At the same time, in the description of the utility model, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance. Of course, such objects can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0035] Embodiment:

[0036] The embodiment provides a high-wear-resistance lightweight electromagnetic shielding composite sealing tape, which is used for sealing and electromagnetic shielding of equipment, and is particularly suitable for doors, windows, interface parts and other sealing scenes which are frequently opened or used with high intensity.

[0037] Referring to Figure 1 and Figure 2From the overall structure, the sealing strip of the embodiment is designed as a closed ring structure with rounded rectangular shape, and its cross section adopts a hollow omega type layout, mainly composed of a deformed main body part 1, a bottom mounting edge 2 and a top edge reinforcing part 3. The deformed main body part 1 is located in the central region of the sealing strip, and its cross section is circular with a hollow structure. The base silicone rubber with a hardness of 40 to 50 Shore A is used as the base material. The hollow design not only significantly reduces the overall weight of the sealing strip, but also effectively enhances the rebound performance and deformation recovery ability, ensuring excellent sealing effect of the sealing strip in long-term use.

[0038] The bottom mounting edge 2 is arranged at the bottom of the deformed main body part 1, and is in an arc or straight line structure extending to both sides, for fixing and mounting with the surface of the equipment. In the embodiment, a layer of glass fiber fabric is embedded in the inside of the bottom mounting edge 2, and the glass fiber fabric is integrally compounded with the base silicone rubber. The combination of the bottom mounting edge 2 and the glass fiber fabric not only improves the tensile strength of the bottom mounting edge, but also significantly enhances the fixing stability of the sealing strip during use, effectively avoiding deformation or loosening phenomenon caused by long-term stress.

[0039] The top edge reinforcing part 3 is arranged at the top of the deformed main body part, and its cross section width gradually increases from top to bottom, presenting a wedge structure. This structure design can effectively optimize the stress distribution, significantly improve the compression resistance of the sealing strip, and ensure its stability under high load conditions. At the same time, the wedge structure can also reduce the structural fatigue caused by stress concentration, thereby prolonging the service life of the sealing strip and improving its reliability.

[0040] Referring to Figure 3 From the layered structure, the sealing strip includes a base silicone rubber 4, a conductive rubber layer 5, a conductive fabric layer 6, a polyester fabric layer 7 and a glass fiber fabric layer 8.

[0041] The base silicone rubber 4 constitutes the main structure of the sealing strip, including the deformed main body part, the bottom mounting edge and the top edge reinforcing part. The base silicone rubber is made of material with a hardness of 40 to 50 Shore A, which has excellent elasticity and rebound performance to ensure that the sealing strip can quickly recover its shape after being compressed or deformed, thereby maintaining stable sealing effect. In addition, the base silicone rubber has good environmental adaptability, can withstand complex environmental conditions such as high and low temperature, heat and humidity, salt spray, etc., providing reliable mechanical strength and long-term stability for the sealing strip.

[0042] The conductive rubber layer 5 and the conductive fabric layer 6 constitute a composite conductive layer with a total thickness ranging from 0.2mm to 2mm, which extends from the top end of the top corner reinforcing part 3 downward, fully covers the outer surface of the deformation main body part 1, and finally extends to the outer surface of the same side bottom mounting edge 2. This extension design not only ensures the continuous conductivity of the entire sealing strip outer surface, but also forms a complete electrical conduction path, providing stable and efficient electromagnetic shielding effect.

[0043] The conductive rubber layer 5 covers the outer surface of the base silicone rubber; the conductive rubber layer 5 is tightly combined with the base silicone rubber through the tackifying process and is vulcanized as a whole, and the volume resistivity of the conductive rubber layer 5 is ≤0.01Ω·m, which ensures the electromagnetic shielding function of the sealing strip and also provides good wear resistance.

[0044] The conductive fabric layer is arranged outside the conductive rubber layer, and high-elasticity polyester conductive fabric is selected as the base material, the surface of which is coated with nickel-copper alloy. In this embodiment, the thickness of the high-elasticity polyester conductive fabric is 0.2mm. This coating design makes the surface resistance of the conductive fabric layer ≤0.5Ω, which can provide an efficient and stable conductive path on the outer surface of the sealing strip, ensuring the continuous stability of the electromagnetic shielding performance. At the same time, the nickel-copper alloy coating endows the conductive fabric layer with excellent corrosion resistance and oxidation resistance, so that the sealing strip can maintain its conductive and shielding characteristics in harsh environments such as high humidity and high salt spray for a long time. In addition, the application of high-elasticity polyester base material further improves the flexibility and durability of the conductive fabric layer, which together with the tight combination with the conductive rubber layer enhances the overall performance of the sealing strip.

[0045] The polyester fabric layer 7 is embedded in the hollow structure of the deformation main body part, and as a key reinforcing layer, its thickness is 0.2mm. In this embodiment, the polyester fabric layer 7 is designed to have a cross-weaving structure, which improves the tensile strength and fatigue resistance of the sealing strip by adjusting the density and direction of the warp and weft. This fabric layer not only plays a supporting role in the hollow structure, but also effectively limits the excessive deformation of the deformation main body part during long-term use, ensuring the stability and durability of the sealing strip, so that the sealing strip can maintain good mechanical properties under complex use environment and high frequency load, providing reliable structural support for long-term sealing of the equipment.

[0046] The glass fiber fabric layer 8 is arranged inside the bottom mounting edge 2, and glass fiber cloth with a thickness of 0.3mm is selected as the material. The glass fiber fabric layer 8 is combined with the base silicone rubber as a whole, which significantly enhances the tensile strength and shear resistance of the bottom mounting edge, so that it can maintain shape stability under high load and frequent operation conditions. The high strength and low ductility of the glass fiber cloth provide additional rigid support, reducing the risk of deformation caused by mechanical stress or long-term use. In addition, this structure can effectively limit the local deformation of the bottom mounting edge, ensuring the stability and durability of the sealing strip in complex use environment.

[0047] To further enhance the overall strength of the sealing tape, in other embodiments, a metal skeleton layer can be embedded inside the bottom mounting edge; the metal skeleton layer is integrated with the base silicone rubber and extends along the inside of the bottom mounting edge, thereby significantly improving the rigidity and deformation resistance of the bottom mounting edge, maintaining a stable state during high-strength installation or long-term use, while reducing fatigue damage caused by frequent mechanical stress.

[0048] The sealing tape scheme of the present embodiment has undergone a number of performance tests and has proven excellent performance in electromagnetic shielding, durability and stability. Through electromagnetic shielding effectiveness testing (refer to GJB8820-2015 standard), in the frequency band of 2MHz to 18GHz, the shielding effectiveness of the sealing tape reaches more than 60dB, and in some frequency bands it can exceed 80dB, showing excellent electromagnetic shielding capability. In the compression resistance test, multiple compression tests were conducted to simulate the actual use environment, the surface resistance of the sealing tape remained ≤0.5Ω, and the cross-sectional height only decreased by 2%, showing good resilience and dimensional stability. In the friction shear test, after tens of thousands of rubbings, the surface resistance of the sealing tape remained ≤0.5Ω, and the cross-sectional height decreased by only 1%, indicating that it has excellent wear resistance and long-term conductivity stability.

[0049] The high-wear-resistant lightweight electromagnetic shielding composite sealing tape of the present embodiment has typical application scenarios in multiple fields and can meet the sealing and electromagnetic shielding needs of key components. In electronic equipment, the sealing tape can be used for the sealing of server cabinets, communication base stations and precision instruments. Its excellent electromagnetic shielding performance can effectively prevent external electromagnetic interference from affecting the internal components of the equipment, while providing air and water tightness to ensure the reliable operation of the equipment.

[0050] In the field of aviation, the sealing tape is suitable for sealing aircraft cabin doors, inspection windows and maintenance hatch covers. Its lightweight design significantly reduces the overall structure weight, while the pressure resistance and fatigue resistance performance can meet the long-term use requirements in high-altitude low-temperature and high-pressure environments. The electromagnetic shielding function can effectively prevent external electromagnetic waves from interfering with avionics, further improving aviation safety.

[0051] In military equipment, the sealing tape is suitable for sealing interfaces such as radar equipment, communication devices and protective cabin doors. Its excellent wear resistance and conductivity stability ensure reliable performance in harsh environments, meeting the needs of frequent opening and closing and high mechanical load, while providing stable electromagnetic protection effectiveness to ensure the safety of equipment operation.

[0052] In addition, in the field of vehicle manufacturing, the sealing strip can be used in the door and window sealing system of special vehicles or electric vehicles. Its excellent resilience and corrosion resistance enable it to adapt to high-frequency opening and closing operations and various climate conditions, while providing effective electromagnetic shielding to prevent high-frequency electromagnetic interference of electric vehicles from affecting vehicle-mounted systems.

[0053] To meet the needs of various scenarios, the sealing strip of the present embodiment is designed with modular characteristics. The closed loop structure of the sealing strip can be designed as a circular ring, a rectangle, an ellipse or other complex shapes according to actual needs, flexibly adapting to the installation requirements of different equipment interfaces. By adjusting the cross-sectional size and material thickness of the sealing strip, personalized matching can be achieved for specific equipment.

[0054] In the application of large-size equipment interfaces, the sealing strip realizes end splicing through reserved connection interfaces or lap joint structures, maintaining the electrical continuity and sealing effect of the spliced sealing strip. The thickness and material of the layered structure can also be optimized according to the actual use environment, such as thickening the conductive layer in a strong electromagnetic interference environment to enhance shielding performance, or selecting a more temperature-resistant silicone rubber matrix in extremely cold or high-temperature environments.

[0055] At the same time, the sealing strip of the present embodiment has the characteristics of componentized production. Its internal reinforcing layer (such as glass fiber fabric, polyester fabric layer) can be prefabricated as a standardized component, which can be quickly assembled through modular design, thus shortening the production cycle and reducing the manufacturing cost. The flexibility and scalability of these modular designs enable the sealing strip to efficiently adapt to the needs of various complex scenarios and meet the application requirements of future higher technical standards.

[0056] The above application of specific examples to the present utility model is described, which is only used to help understand the present utility model, and does not limit the present utility model. For those skilled in the art to which the present utility model belongs, according to the idea of the present utility model, a number of simple deductions, transformations or substitutions can be made.

Claims

1. A high abrasion resistant, lightweight, electromagnetic shielding composite sealing tape, characterized by, The sealing tape has a hollow closed Ω-shaped cross-section structure, comprising an integral forming deformation main body, a bottom mounting edge and a top edge reinforcing part; the cross-section of the deformation main body is circular, and the inside is a hollow structure; the bottom mounting edge is arranged at the bottom of the deformation main body, and the bottom mounting edge extends to both sides in an arc shape or a straight line structure; the top edge reinforcing part is arranged at the top end of the deformation main body, and the top edge reinforcing part is a ridge-shaped protrusion; The sealing tape comprises a base silicone rubber, a conductive rubber layer, a conductive fabric layer and a polyester fabric layer; The base silicone rubber constitutes the main structure of the deformation main body, the bottom mounting edge and the top edge reinforcing part; the conductive rubber layer is wrapped on the outer working surface of the deformation main body, the top edge reinforcing part and the bottom mounting edge, and the conductive rubber layer is tightly combined with the base silicone rubber; The conductive fabric layer is covered on the outside of the conductive rubber layer, and the conductive fabric layer is integrally combined with the conductive rubber layer; The polyester fabric layer is arranged in the hollow structure of the deformation main body, and the polyester fabric layer is integrally combined with the conductive rubber layer.

2. The high wear resistant lightweight electromagnetic shielding composite sealing tape according to claim 1, wherein, The conductive rubber layer and the conductive fabric layer extend downward along the top end of the top edge reinforcing part, wrap along the outside surface of the deformation main body, and finally extend to the outer surface of the same side bottom mounting edge.

3. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The sealing tape further comprises a glass fiber fabric layer arranged in the bottom mounting edge, and the glass fiber fabric layer is arranged in the base silicone rubber.

4. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The conductive fabric layer is a high-elasticity polyester conductive fabric, the surface of the high-elasticity polyester conductive fabric is coated with a nickel-copper alloy, and the surface resistance of the conductive fabric layer is less than or equal to 0.5Ω.

5. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The volume resistivity of the conductive rubber layer is less than or equal to 0.01Ω·m.

6. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The sealing tape further comprises a metal skeleton layer embedded in the bottom mounting edge, the metal skeleton layer is integrally combined with the base silicone rubber, and extends along the inside of the bottom mounting edge.

7. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The cross-sectional width of the top edge reinforcing part gradually decreases from top to bottom, and has a wedge-shaped structure.

8. The high wear resistant lightweight electromagnetic shielding composite sealing tape of claim 1, wherein, The thickness of the composite conductive layer formed by the conductive rubber layer and the conductive fabric layer ranges from 0.2mm to 2mm.

9. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 1, wherein, The overall shape of the sealing tape is a closed ring.

10. The high wear resistant lightweight electromagnetic shielding composite sealant tape of claim 9, wherein, The overall shape of the sealing tape is a circular ring structure or a circular rectangular structure.

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