EPDM (Ethylene-Propylene-Diene Monomer) sealing sound insulation component for through type tail lamp, preparation method of EPDM

Abstract

The invention discloses an EPDM (Ethylene-Propylene-Diene Monomer) sealing sound insulation component for a through type tail lamp, a preparation method of the EPDM sealing sound insulation component and vehicle application, an EPDM sheet is produced through a supercritical closed-cell foaming process, the EPDM sheet has a micro-nano closed-cell structure, the density is 55-750 kg / m, the hardness is 15-70 Shore C, and the compression set rate is not greater than 5%; an environment-aging-resistant pressure-sensitive adhesive layer is attached to one side of the EPDM sheet, and the other side of the EPDM sheet is a sealed contact surface; and the sealing sound insulation component is formed into a shape matched with the combination surface of the penetrating type tail lamp and the vehicle body through die cutting processing. By means of the mode, rain leakage and dust invasion of the long combination face of the penetrating type tail lamp can be effectively prevented, the driving safety in rainy days is remarkably improved, and a long-acting sealing solution is provided for the penetrating type tail lamp; the noise in the vehicle at the speed of 120 km / h is not higher than 57 dB (A), the noise in the vehicle at the speed of 60 km / h is not higher than 53.2 dB (A), the noise is reduced by 3-5 dB (A) compared with that of a mainstream electric vehicle, the library-level mute level is achieved, driving fatigue is reduced, the sound insulation and noise reduction performance is remarkable, and the driving comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of sealing material manufacturing, and in particular to an EPDM sealing and sound insulation component for a through-type taillight, its preparation method, and its vehicle application. Background Technology

[0002] As a signature element of modern automotive design, continuous taillights have been widely adopted in numerous models. This design, through a slender light strip spanning the rear of the vehicle, not only significantly enhances the vehicle's visual width and sense of luxury but also improves nighttime driving safety through dynamic lighting effects. With the integration of laser matrix and OLED technologies, continuous taillights have become an important vehicle for showcasing technological attributes. However, this design also presents unique technical challenges—since the light body is typically over 1.5 meters long, the perimeter of its sealing interface with the vehicle body often exceeds 3.6 meters, and it needs to adapt to the curved shapes of different vehicle models. This places extremely high demands on the performance of sealing materials and installation processes.

[0003] Currently, the industry mainly uses two sealing solutions, both of which have significant drawbacks. While sealant-based solutions can adapt to irregular joint surfaces, they require uniform application and precise control of the sealant thickness; too thick or too thin a layer will affect the sealing effect. More seriously, the sealant forms a rigid connection after curing, making subsequent repairs and replacements extremely difficult. The other low-cost, ordinary foam solution suffers from insufficient material sealing reliability, easily leading to water leakage and noise intrusion at the joint surface. Actual measurements show that at a vehicle speed of 120 km / h, the interior noise can reach 64 dB(A), severely impacting driving comfort. Furthermore, existing sealing materials have poor aging resistance, requiring replacement every 2-3 years, and are prone to twisting and misalignment during installation, failing to meet the assembly precision and efficiency requirements of automotive assembly lines. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a low-cost, long-term reliable sealing EPDM sealing and sound insulation component for a through-type taillight, which can effectively reduce in-vehicle noise, is easy to install and has controllable precision, as well as its preparation method and vehicle application.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide an EPDM sealing and sound insulation component for a through-type taillight, comprising: an EPDM sheet produced by a supercritical closed-cell foaming process, wherein the EPDM sheet has a micro-nano-scale closed-cell structure, a density of 55-750 kg / m³, a hardness of 15-70 Shore C, and a compression set of no more than 5%; The EPDM sheet has an environmentally resistant pressure-sensitive adhesive layer bonded to one side, and a sealed contact surface on the other side. The sealing and sound insulation component is formed by die-cutting to match the surface of the body that is connected to the through taillight.

[0006] In a preferred embodiment of the present invention, the thermal conductivity of the EPDM sheet is not higher than 0.032 W / (m·K), and the volume resistivity is not lower than 10^16 Ω·cm.

[0007] In a preferred embodiment of the present invention, the perimeter of the sealing and sound insulation component is increased by 10%-15% relative to the perimeter of the mating surface, and this compensation is configured to adapt to changes in the curvature of the rear of the vehicle and installation deformation.

[0008] In a preferred embodiment of the present invention, the operating temperature range of the sealing and sound insulation component is -40°C to 150°C, and its performance remains stable after being immersed in high-temperature steam for 100 hours.

[0009] In a preferred embodiment of the present invention, the sealing and sound insulation component is formed by die-cutting to match the mating surface of the through taillight, including a snap-on or threaded mounting structure.

[0010] In a preferred embodiment of the present invention, the thickness of the sealing and sound insulation component is 3-8 mm and the closed-cell rate is 85%-98%, which is used to ensure that the in-vehicle noise at a speed of 120 km / h is not higher than 57 dB(A).

[0011] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a method for preparing an EPDM sealing and sound insulation component for a through-type taillight, comprising the following steps: a. Provide EPDM sheets and double-sided release paper pressure-sensitive tapes produced by supercritical closed-cell foaming process; b. Lay the EPDM sheet and pressure-sensitive tape together under a pressure of 0.1-0.5 MPa; c. Use precision die-cutting to cut composite materials and form sealed and sound-insulating components in one step; d. Inspect, package, and store the finished products.

[0012] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a vehicle equipped with a sealing and sound insulation component as described above, wherein the sealing and sound insulation component is continuously arranged along the joint surface between the through-type taillight and the vehicle body.

[0013] The beneficial effects of this invention are as follows: This invention uses the supercritical closed-cell foaming process of EPDM material to form a micro-nano-level closed-cell structure, which makes the sealing component have high elasticity (compression permanent deformation rate ≤5%) and uniform sealing pressure, effectively preventing rain and dust intrusion at the long joint surface of the through taillight, solving the leakage problem of traditional sealant or foam, significantly improving driving safety in rainy weather, and providing a long-term sealing solution for through taillights.

[0014] The closed-cell structure and low thermal conductivity of the sealing components effectively block noise transmission. This achieves in-vehicle noise levels no higher than 57 dB(A) at 120 km / h and no higher than 53.2 dB(A) at 60 km / h, a reduction of 3-5 dB(A) compared to mainstream electric vehicles, reaching library-level quietness, reducing driver fatigue, significantly improving sound insulation and noise reduction performance, and enhancing ride comfort.

[0015] After the sealing components are bonded to the environmentally resistant pressure-sensitive adhesive, they are die-cut into shape, achieving one-time precision processing. No complicated processes are required during installation, which greatly improves assembly efficiency and solves the problems of slow assembly and difficult maintenance of traditional solutions, meeting the high-paced requirements of automobile manufacturing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of the EPDM sealing and sound insulation component for a through-type taillight according to the present invention.

[0017] Figure 2 This is a top view of the EPDM sealing and sound insulation component for a through-type taillight according to the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that the terms "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the invention and for 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 invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Please see Figure 1 and Figure 2 , The present invention includes: an EPDM sealing and sound insulation component for a through-type taillight, comprising: an EPDM sheet 1 produced by supercritical closed-cell foaming process, wherein the EPDM sheet has a micro-nano closed-cell structure, a density of 55-750 kg / m³, a hardness of 15-70 Shore C, and a compression set of no more than 5%.

[0025] The EPDM sheet 1 has an environmentally resistant pressure-sensitive adhesive layer 2 bonded to one side, and a sealing contact surface on the other side. The sealing and sound insulation component is die-cut to form a shape that fits the body surface of the through taillight, including a snap-on or threaded installation structure.

[0026] Supercritical closed-cell foaming process uses supercritical fluids (such as CO2 or N2) as foaming agents to generate independently distributed closed-cell structures, enabling the material to achieve stress values ​​of 80-150 kPa at a 25% compression rate, making it suitable for high-load scenarios.

[0027] Pressure-sensitive adhesive layer 2 has aging resistance properties, ensuring bonding stability in humid, ultraviolet and other environments.

[0028] The die-cutting process accuracy is controlled within ±0.2mm to ensure a seamless fit between the parts and the mating surfaces.

[0029] The perimeter of the sealed sound insulation component is increased by 10%-15% relative to the perimeter of the mating surface. This compensation is configured to accommodate changes in the curvature of the vehicle's rear end and installation deformation. The compensation is achieved through a die-cutting process, and combined with the high elasticity of EPDM material, it can absorb deformation caused by thermal expansion and contraction or vehicle vibration.

[0030] The sealed sound insulation components operate within a temperature range of -40°C to 150°C and maintain stable performance after immersion in high-temperature steam for 100 hours. The materials have undergone accelerated aging tests to verify their durability in extreme environments, meeting automotive industry standards.

[0031] The thickness of the sealed sound insulation components is 3-8mm, and the closed-cell rate is 85%-98%, which is used to ensure that the in-vehicle noise at a speed of 120km / h is not higher than 57dB(A).

[0032] Another embodiment of the present invention includes: a method for preparing an EPDM sealing and sound insulation component for a through-type taillight, comprising the following steps: a. Provide EPDM sheets 1 and double-sided release paper pressure-sensitive tape 2 produced by supercritical closed-cell foaming process; b. Bond the EPDM sheet 1 to the pressure-sensitive tape 2 under a pressure of 0.1-0.5 MPa, ensuring no air bubbles are present; c. Use precision die-cutting to cut composite materials, and process sealing and sound insulation components in one step to adapt to the joint surface shape of different vehicle models; d. Inspect, package, and store the finished products.

[0033] Among them, EPDM sheet 1 produced by supercritical closed-cell foaming process has the following performance advantages: (1) Excellent environmental temperature resistance and mechanical durability: The working temperature range is extended to -40℃~150℃. After being immersed in high-temperature steam for 100 hours, the performance remains stable. It has passed 1 million scraping tests and is resistant to ozone aging, ensuring the sealing reliability during long-term use in vehicles. (2) Thermal and sound insulation performance with low thermal conductivity: The closed-cell structure effectively blocks heat conduction, with a thermal conductivity as low as 0.032 W / (m·K), while the volume resistivity is not less than 10¹ 6 Ω·cm, providing excellent insulation, suitable for sound insulation needs in automotive taillight sealing scenarios; (3) Environmental protection and safety performance: The physical foaming process avoids chemical crosslinking agent residue, has low VOC emissions, and the material is recyclable, meeting the environmental protection standards of the automotive industry, such as ISO 14000.

[0034] The above performance parameters have been verified through accelerated aging tests and industry standard tests, enabling the sealed sound insulation components to achieve the beneficial effects of waterproofing, sound insulation and noise reduction in the long joint surface application of through-type taillights.

[0035] Another embodiment of the present invention includes: a vehicle equipped with the above-mentioned sealing and sound insulation component, the sealing and sound insulation component being continuously arranged along the joint surface between the through-type taillight and the vehicle body.

[0036] During implementation, first clean the mating surfaces of the vehicle body, then peel off the pressure-sensitive adhesive release paper, directly paste the components, and press to ensure a proper fit. A continuous arrangement covering the entire circumference of the taillights avoids leakage points associated with segmented sealing. The installation process requires no additional tools or curing time, significantly improving assembly line efficiency. The reliable sealing results in reduced in-vehicle noise, lower energy consumption for electric vehicles, and improved comfort.

[0037] This invention utilizes the supercritical closed-cell foaming process of EPDM material to form a micro-nano-scale closed-cell structure, enabling the sealing component to have high elasticity (compression permanent deformation rate ≤5%) and uniform sealing pressure. This effectively prevents rain and dust intrusion at the long joint surface of the through-type taillight, solves the leakage problem of traditional sealants or foam, significantly improves driving safety in rainy weather, and provides a long-lasting sealing solution for through-type taillights.

[0038] The closed-cell structure and low thermal conductivity of the sealing components effectively block noise transmission. This achieves in-vehicle noise levels no higher than 57 dB(A) at 120 km / h and no higher than 53.2 dB(A) at 60 km / h, a reduction of 3-5 dB(A) compared to mainstream electric vehicles, reaching library-level quietness, reducing driver fatigue, significantly improving sound insulation and noise reduction performance, and enhancing ride comfort.

[0039] After the sealing components are bonded to the environmentally resistant pressure-sensitive adhesive, they are die-cut into shape, achieving one-time precision processing. No complicated processes are required during installation, which greatly improves assembly efficiency and solves the problems of slow assembly and difficult maintenance of traditional solutions, meeting the high-paced requirements of automobile manufacturing.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An EPDM sealing and sound deadening component for a through mount tail light characterized by, Comprise: EPDM sheet produced by supercritical closed-cell foaming process, the EPDM sheet has micro-nano closed-cell structure, density is 55-750 kg / m³, hardness is 15-70 Shore C, compression set is not more than 5%; The EPDM sheet is attached with an environmental aging resistant pressure sensitive adhesive layer on one side, and the other side is a sealing contact surface; The sealing and sound insulation part is formed by die cutting processing to match the shape of the through tail lamp body joint surface.

2. The EPDM acoustic seal member for a pass-through tail light of claim 1, wherein, The thermal conductivity of the EPDM sheet is not higher than 0.032 W / (m·K), and the volume resistivity is not less than 10^16 Ω·cm.

3. The EPDM acoustic seal member for a pass-through tail light of claim 1, wherein, The circumference of the sealing and sound insulation part is increased by 10%-15% of the compensation amount relative to the circumference of the joint surface, which is configured to adapt to the change of the tail curvature and the installation deformation.

4. The EPDM acoustic seal member for a pass-through tail light of claim 1, wherein, The working temperature range of the sealing and sound insulation part is-40℃ to 150℃, and the performance remains stable after high temperature steam soaking for 100 hours.

5. The EPDM acoustic seal member for a through-mount tail light of claim 1, wherein, The sealing and sound insulation part is formed by die cutting processing to match the shape of the through tail lamp joint surface, including the buckle type and threaded type installation structure.

6. The EPDM acoustic seal member for a through-mount tail light of claim 1, wherein, The thickness of the sealing and sound insulation part is 3-8mm, and the closed-cell rate is 85%-98%, which is used to make the vehicle interior noise not higher than 57dB(A) at a speed of 120km / h.

7. The method of claim 1-6 for making EPDM sound-deadening components for through- mounted tail lamps, characterized in that, Comprise the following steps: a. Provide EPDM sheet produced by supercritical closed-cell foaming process and double-sided release paper pressure sensitive adhesive tape; b. Attach the EPDM sheet and the pressure sensitive adhesive tape under the pressure of 0.1-0.5MPa; c. Die cutting the composite material using a precision die, one-time forming processing the sealing and sound insulation part; d. Inspection, packaging and warehousing of the finished product.

8. A vehicle characterized by: Install the sealing and sound insulation part as claimed in any one of claims 1-6, which is continuously arranged along the joint surface of the through tail lamp and the vehicle body.

Images