Expanding adhesive block for improving watertight performance of automobile body

Abstract

Disclosed in the present application is an expanding adhesive block for improving the watertight performance of an automobile body. The expanding adhesive block comprises a framework (1) and a foam adhesive (3) provided between the framework (1) and automobile body sheet metal (2), wherein the framework (1) is provided with an auxiliary sealing structure for filling gaps, and the auxiliary sealing structure is a thermally flowable hot-melt adhesive (4). By additionally providing the auxiliary sealing structure on the basis of the foam adhesive (3), the remaining holes that are not filled by the foam adhesive (3) after foaming can be effectively filled, thereby achieving the effect of filling the gaps on the inner side of the automobile body sheet metal (2). By heating the thermally flowable hot-melt adhesive (4), a fluid formed after the softening of the thermally flowable hot-melt adhesive (4) can flow to the foam adhesive (3) along the framework (1), thereby filling gaps of the foam adhesive (3). In addition, the foam adhesive (3) is made of a high-density material, thereby reducing the formation of holes, and the framework (1) is made of a high-temperature-resistant material, thereby avoiding melting during heating.

Description

An expanding rubber block for improving the water sealing performance of automobile bodies Technical Field

[0001] This application belongs to the field of automotive technology, and more specifically, it relates to an expansion rubber block for improving the water sealing performance of automotive bodies. Background Technology

[0002] During the automobile production process, there will be cavities between the body sheet metal and the body frame. Generally, it is necessary to fill the cavities with expanding foam to seal them and prevent water leakage.

[0003] A patent application with patent number 201521125633.1, published on May 18, 2016, discloses a novel structural automotive window guide rail sealing strip that replaces the flocking process. The strip includes a sealing strip body positioned along the upper edge of the window sheet metal. The upper end of the sealing strip body has a strip-shaped protrusion and an internally hollow foamed structure. Both the protrusion and the foamed structure are in contact with the car body sheet metal and extend outwards towards the car body. The foamed structure is made of EPDM (ethylene propylene diene monomer) foam material. The inner surface of the protrusion, close to the foamed structure, is also made of EPDM foam material. The surface of the sealing strip body used to connect the protrusion and the foamed structure is also made of EPDM foam material. The density of the EPDM foam material is 0.8 ± 0.05 g / cm³. 3 The EPDM foam material has a 12±3µm thick lubricating coating on its surface. This EPDM foam provides better dustproofing, noise reduction, and vibration damping between the car door frame and the body. The lubricating coating also helps to lubricate and prevent wear between the door seals and the body panels when the doors are opened and closed.

[0004] Existing expansion sealant blocks are difficult to completely fill the cavities in the vehicle body after foaming, posing a risk of water leakage. The existing expansion sealant block structure consists of a skeleton layer plus a layer of foam sealant. When there are holes after the only layer of foam sealant has expanded, there are no other measures to continue sealing this section, which will lead to seal failure.

[0005] Application content

[0006] This application aims to provide an expansion block with high sealing performance for improving the water sealing performance of automotive bodies.

[0007] To achieve the above objectives, the technical solution adopted in this application is: an expanding rubber block for improving the water sealing performance of automobile bodies, comprising a skeleton and a foaming adhesive disposed between the skeleton and the body sheet metal, wherein the skeleton is provided with an auxiliary sealing structure for filling gaps.

[0008] The auxiliary sealing structure is a hot-flowing melt adhesive.

[0009] The top of the frame is provided with a support plate for storing auxiliary sealing structures.

[0010] The auxiliary sealing structure is located above the foam.

[0011] The frame has a groove on the side facing the body sheet metal, and the expanding foam is stored inside the groove.

[0012] The hot-flowing hot melt adhesive is EVA (ethylene-vinyl acetate copolymer) hot melt adhesive, PU (polyurethane) hot melt adhesive, or EPDM hot melt adhesive. Before heating, the hot-flowing hot melt adhesive is a cuboid, and the dimensions of the cross-section of the cuboid perpendicular to its longitudinal axis are between 5x5mm and 10x10mm.

[0013] The density of the foam before foaming is 0.8-1.5 g / cm³. 3 After foaming, the density is 0.1-0.3 g / cm³. 3 The foam is EVA foam, PU foam, or EPDM foam. Before foaming, the foam is a cuboid, and the cross-sectional dimensions of the cuboid perpendicular to its longitudinal axis are between 3x3mm and 8x8mm.

[0014] The skeleton is a PA (nylon) 6 skeleton, a PA66 skeleton, or a PBT (polybutylene terephthalate) skeleton.

[0015] The technical effect of this application is as follows: the expansion sealant block is designed as a structure in which foam and hot melt adhesive are integrated into a skeleton. The foam first foams, filling more than 95% of the cavity, and serves as a support surface for the hot melt adhesive. The hot melt adhesive softens when heated, and the fluid flows and fills the remaining pores that the foam did not fill after foaming, thus achieving sealing and filling. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 is a schematic diagram of the structure of an expansion rubber block for improving the water sealing performance of automobile bodies according to this application;

[0018] Figure 2 is a schematic diagram of the structure of an expanding adhesive block used to improve the water sealing performance of a car body after foaming and after melting of the hot-flowing melt adhesive.

[0019] The markings in the diagram are: 1. Skeleton; 2. Body sheet metal; 3. Expanding foam; 4. Hot-flowing melt adhesive; 5. Support plate. Detailed Implementation

[0020] The specific implementation of this application will be further described in detail below with reference to the accompanying drawings and through the description of the embodiments. The purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the application concept and technical solution of this application, and to facilitate its implementation.

[0021] Please refer to Figures 1-2. An expanding adhesive block for improving the water sealing performance of an automobile body includes a skeleton 1 and expanding adhesive 3 disposed between the skeleton 1 and the body sheet metal 2. The skeleton 1 is provided with an auxiliary sealing structure for filling gaps. Based on the expanding adhesive 3, the auxiliary sealing structure is added, which can effectively fill the remaining micro-pores that are not filled after the expanding adhesive 3 has expanded, and can achieve the effect of filling the gaps on the inner side of the body sheet metal 2.

[0022] The auxiliary sealing structure is a hot-flowing molten adhesive 4. By heating the hot-flowing molten adhesive 4, it melts and flows along the skeleton 1 to the foamed foam 3, thereby filling the remaining micro-pores that were not filled after the foamed foam 3.

[0023] The top of the frame 1 is provided with a support plate 5 for storing the auxiliary sealing structure; when installing the frame 1, the auxiliary sealing structure can be directly installed into the vehicle body to facilitate subsequent sealing.

[0024] The auxiliary sealing structure is located above the foam 3; in this way, after the hot-flowing molten adhesive 4 melts, it can flow downward under the action of gravity and flow onto the foamed foam 3, thus sealing the remaining tiny pores that were not filled after the foaming of the foam 3.

[0025] The frame 1 has a groove on the side facing the body sheet metal 2, and the expanding foam 3 is stored inside the groove; it is convenient for storage, and after foaming, it can directly fill the gap between the body and the frame 1.

[0026] The hot-flowing hot melt adhesive 4 is an EVA (ethylene-vinyl acetate copolymer) hot melt adhesive, a PU (polyurethane) hot melt adhesive, or an EPDM hot melt adhesive. The hot-flowing hot melt adhesive is a cuboid, and the dimensions of its cross-section perpendicular to the longitudinal axis of the cuboid are between 5X5mm and 10X10mm. These materials are micro-foamed or non-foamed, with few pores.

[0027] The density of the expanding foam before foaming is 0.8-1.5 g / cm³. 3 After foaming, the density is 0.1-0.3 g / cm³. 3The foam 3 is EVA foam, PU foam, or EPDM foam. Before foaming, the foam 3 is a cuboid with a cross-sectional dimension between 3x3mm and 8x8mm perpendicular to the longitudinal axis of the cuboid. Compared to materials with low density, these materials have higher density, reducing the generation of unfilled micropores after foaming. This avoids the problem of excessively large micropores caused by low-density materials after foaming. When the micropores are too large, the hot-flowing melt adhesive 4 cannot completely fill them and will pass through them, failing to seal them and resulting in a failure to achieve a water seal.

[0028] The skeleton 1 is a PA (nylon) 6 skeleton 1, a PA (nylon) 66 skeleton 1, or a PBT (polybutylene terephthalate) skeleton 1; high temperature resistant materials are used to avoid the skeleton 1 melting during heating.

[0029] The technical effect of this application is as follows: the expansion sealing block is designed as a structure in which foam 3 and hot flowable melt adhesive 4 are integrated in a skeleton 1. The foam 3 foams first, filling more than 95% of the cavity, and serves as a support surface for the hot flowable melt adhesive 4 after being heated. The hot flowable melt adhesive softens after being heated, and the fluid formed flows and fills the remaining micro-pores that are not filled after the foam 3 foams, thus achieving sealing and filling.

[0030] The present application has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present application is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present application; or the direct application of the inventive concept and technical solution of the present application to other situations without modification, are all within the protection scope of the present application.

Claims

1. An expanding rubber block for improving the water-sealing performance of automobile bodies, characterized in that: It includes a frame (1) and a foam (3) disposed between the frame (1) and the body sheet metal (2), wherein the frame (1) is provided with an auxiliary sealing structure for filling gaps.

2. The expanding rubber block for improving the water-sealing performance of automobile bodies according to claim 1, characterized in that: The auxiliary sealing structure is a hot-flowing melt adhesive (4).

3. The expanding rubber block for improving the water-sealing performance of automobile bodies according to claim 1, characterized in that: The top of the frame (1) is provided with a support plate (5) for storing the auxiliary sealing structure.

4. An expanding adhesive block for improving the water-sealing performance of an automobile body according to claim 1, 2, or 3, characterized in that: The auxiliary sealing structure is located above the foam (3).

5. An expanding adhesive block for improving the water-sealing performance of an automobile body according to claim 1 or 3, characterized in that: The frame (1) has a groove on the side facing the body sheet metal (2), and the foam (3) is stored inside the groove.

6. An expanding adhesive block for improving the water-sealing performance of an automobile body according to claim 2, characterized in that: The hot-flowing hot melt adhesive (4) is EVA hot melt adhesive, PU hot melt adhesive or EPDM hot melt adhesive. The hot-flowing hot melt adhesive is a cuboid before heating, and the cross-sectional dimensions of the cuboid are between 5X5mm and 10X10mm.

7. An expanding adhesive block for improving the water-sealing performance of an automobile body according to claim 1, characterized in that: The density of the foam (3) before foaming is 0.8-1.5 g / cm³. 3 After foaming, the density is 0.1-0.3 g / cm³. 3 The foam (3) is EVA foam (3), PU foam (3) or EPDM foam (3). The foam (3) is a cuboid before foaming, and the cross-sectional dimensions of the cuboid are between 3X3mm and 8X8mm.

8. An expanding adhesive block for improving the water-sealing performance of automobile bodies according to claim 1, characterized in that: The skeleton (1) is a PA6 skeleton (1), a PA66 skeleton (1), or a PBT skeleton (1).

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