Four-composite automobile sealing strip, mold and automobile

Abstract

The four-composite automobile sealing strip is formed by co-extrusion molding of dense glue, a framework, polystyrene foam and low-density polystyrene foam, the framework is wrapped in the dense glue to form an inverted-U-shaped inserting groove, and the low-density polystyrene foam is arranged at the top of the inverted-U-shaped inserting groove; after the automobile sealing strip is installed, the metal plate abuts against the low-density polystyrene foam, and a plurality of sealing teeth are arranged in the inverted-U-shaped inserting groove so that the automobile sealing strip can be fixed to the metal plate. The sealing effect is better than that of traditional butyl rubber sealing, the problems that the tail door leaks water easily due to the fact that the rubber injection amount of butyl rubber sealing rubber is unstable and the butyl rubber sealing rubber pollutes a vehicle body in the vehicle loading process are solved, and the peculiar smell of the sealing strip is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sealing strips, and in particular to automobile sealing strips. Background Art

[0002] With the development of the automotive industry, consumers' requirements for automobile commodity quality are gradually increasing. The tailgate sealing strip plays the role of sealing, shock absorption and decoration, and is installed on the rear panel of the car body. A reasonable tailgate sealing strip structure helps to improve the sealing and appearance quality of the car in details, and enhance the commodity quality of the car.

[0003] Chinese patent application CN207747732U discloses a tailgate sealing strip, which at least includes a sealing strip body, wherein a metal frame is arranged inside the sealing strip body, wherein the metal frame includes a plurality of frame units, wherein the frame unit is in a U-shaped structure, including an inner vertical unit, an outer vertical unit and a groove bottom unit, wherein the two ends of the groove bottom unit are respectively connected to the inner vertical unit and the outer vertical unit; two adjacent frame units are connected by a connecting portion at the position where the inner vertical unit and the groove bottom unit are connected, and a slot hole is arranged at the position corresponding to the connecting portion of the frame unit. The tailgate sealing strip of the above structure has better ductility and flexibility, and a more stable length, so that the sealing of the tailgate of the car is better and the sealing life is longer. A sealant is arranged on the top wall of the tailgate sealing strip slot, and the sealant is in direct extrusion contact with the top of the sheet metal to achieve sealing of the inside and outside, but the defects of this design include:

[0004] 1. The sealant is usually made of butyl sealant, which needs to be poured in a post-process (i.e. after the vulcanization of the tailgate door opening seal strip is completed). However, due to the difficulty in controlling the sealant flow rate and the strip movement speed during the pouring process, the pouring amount, pouring height, pouring position, and smoothness of the rubber material cannot reach the designed state. In the actual loading process, problems such as sealant overflow and contamination of sheet metal, insufficient sealing causing tailgate leakage often occur;

[0005] 2. The cost of butyl rubber is high, and its VOC and odor emission performance is poor, resulting in poor environmental performance of the sealing strip and even the entire vehicle;

[0006] 3. The sealing strips injected with butyl rubber as sealant cannot be removed for secondary assembly because the sealant has already adhered to the sheet metal. If secondary assembly is forced, the sealant will fail and cause problems such as tailgate leakage. Summary of the invention

[0007] The present application designs a four-composite automobile sealing strip. After dense rubber, a frame, foamed rubber and low-density foamed rubber are co-extruded and formed, the four-composite automobile sealing strip is obtained through processes such as deformation, vulcanization and cutting, so as to solve the defect of the tailgate sealing strip having a strong odor in the prior art.

[0008] In order to achieve the above purpose, this application adopts the following technical solutions:

[0009] A four-composite automobile sealing strip is made by extruding dense rubber, a skeleton, foamed rubber and low-density foamed rubber together. The dense rubber is coated with a skeleton to form an inverted U-shaped slot, and the low-density foamed rubber is arranged on the top of the inverted U-shaped slot.

[0010] After the automobile sealing strip is installed, the sheet metal is abutted against the low-density foam rubber, and a plurality of sealing teeth are arranged in the inverted U-shaped slot to fix the automobile sealing strip on the sheet metal.

[0011] Specifically, the low-density foam rubber is EPDM foam rubber.

[0012] Specifically, the density of the low-density foamed rubber is 0.25-0.32 g / cm 3 .

[0013] Specifically, the density of the foam is 0.6±0.1 g / cm 3 .

[0014] Specifically, the third sealing tooth is arranged opposite to the fifth sealing tooth, and the third sealing tooth partially protrudes to cooperate with the fifth sealing tooth to enhance the firmness of fixing the sealing strip.

[0015] Specifically, a third foam rubber lip is provided to abut against the sheet metal for dust and water prevention.

[0016] Specifically, a second foam rubber lip is provided for covering the sheet metal gap.

[0017] Specifically, the decorative plate is inserted into the gap between the dense glue lip and the inverted U-shaped slot.

[0018] Specifically, the first foaming adhesive lip is arranged on one side of the dense adhesive lip.

[0019] A mould is used for producing the above-mentioned four-composite automobile sealing strip.

[0020] A car is equipped with the above-mentioned four-composite car sealing strip.

[0021] Compared with the prior art, the advantages and positive effects of this application are:

[0022] 1. Select a density of 0.25 - 0.32 g / cm 3The low-density foam glue has low density, is soft and has good waterproof performance, and has a better sealing effect. On the one hand, it solves the problem of unstable injection amount of butyl sealant, which easily causes tailgate leakage, and solves the problem of butyl sealant contaminating the car body when loading, and reduces the odor of the sealing strip and the impact of the odor on the human body; on the other hand, it eliminates the manpower, material resources and site required for the later injection of glue, thereby reducing costs and increasing efficiency.

[0023] 2. The low-density foamed rubber is made of environmentally friendly EPDM material, which is extruded together with the other three materials and then subjected to deformation, foaming, vulcanization and other processes. The low-density foamed rubber has a good composite effect with the dense rubber substrate (EPDM), and has better composite performance than the technical solution in the prior art that connects the low-density sponge (usually polyurethane sponge) to the sealing strip body by bonding or other methods.

[0024] 3. A third foam rubber lip is provided to abut against the sheet metal for dust and water prevention, and a second foam rubber lip is provided to cover the gap between the sheet metal to improve the overall aesthetics of the vehicle.

[0025] 4. The third sealing tooth is arranged opposite to the fifth sealing tooth. The protruding portion of the third sealing tooth cooperates with the fifth sealing tooth to enhance the firmness of the sealing strip fixation and prevent dust, liquid, etc. from falling into the inverted U-shaped slot before the sealing strip is installed on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of the fourth composite sealing strip of the present application;

[0027] Figure 2 This is a schematic diagram of the mold of the four composite sealing strips of this application.

[0028] 1. dense glue; 11. first sealing tooth; 12. second sealing tooth; 13. third sealing tooth; 14. fourth sealing tooth; 15. fifth sealing tooth; 16. dense glue lip; 21. foam tube; 22. first foam glue lip; 23. second foam glue lip; 24. third foam glue lip; 3. skeleton; 5. low-density foam glue; 6. sheet metal; 7. decorative panel; 8. mold; 81. dense glue flow channel; 82. foam glue flow channel; 83. low-density foam glue flow channel. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the present application is not limited to the specific embodiments of the following disclosure.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] A four-composite automobile sealing strip is made by extruding dense rubber, a skeleton, foamed rubber and low-density foamed rubber together. The dense rubber is coated with a skeleton to form an inverted U-shaped slot, and the low-density foamed rubber is arranged on the top of the inverted U-shaped slot.

[0034] After the automobile sealing strip is installed, the sheet metal and the low-density foam rubber are offset, and a number of sealing teeth are arranged in the inverted U-shaped slot to fix the automobile sealing strip on the sheet metal. The low-density foam rubber is EPDM foam rubber, and the density of the low-density foam rubber is 0.25 - 0.32 g / cm 3 The density of the foam is 0.6±0.1 g / cm 3 .

[0035] Specifically, the low-density foamed rubber is an EPDM foaming material, wherein the EPDM substrate brand is specifically selected from ARLANXEO's bio-based ethylene propylene diene monomer (EPDM) product Keltan Eco. The ethylene segment in the EPDM of this product is bio-based Eco ethylene (derived from sugarcane extraction and synthesis), which is different from the chemical synthetic ethylene in traditional EPDM, has less odor and lower VOC content.

[0036] Specifically, the formula of the low-density foamed rubber includes: 100 parts of EPDM, 50-70 parts of environmentally friendly carbon black, 4-10 parts of calcium carbonate, 50-75 parts of paraffin oil, 5-10 parts of zinc oxide, 2-3 parts of stearic acid, 0.5-1.5 parts of sulfur, and 5-15 parts of foaming agent OBSH. The above materials are subjected to internal mixing, open mixing, stripping, and cooling to obtain unfoamed low-density foamed rubber material.

[0037] The formula and preparation process of the foaming glue refer to Chinese patent application CN112063058A.

[0038] Those skilled in the art can freely purchase all the above materials on the market.

[0039] When the sealing strip of the present application is produced, the dense glue, the skeleton, the foam glue and the low-density foam glue (the foam glue has not yet been foamed) are extruded together. For details, please refer to the attached figure Figure 2 Schematic diagram of the sealing strip mold (the dotted lines in the figure are only for simple illustration. The mold technicians in this field can set multiple branch openings in the foam glue flow channel according to actual needs to make the foam glue flow to the part to be attached). During extrusion, the dense glue and the frame are extruded forward together through the dense glue flow channel, the foam glue is extruded together with the dense glue through the foam glue flow channel, and the low-density foam glue is extruded together with the dense glue through the low-density foam glue flow channel. The extruded sealing strip needs to be rolled and deformed by a roller to form Figure 1 After the structure is shown, the four-composite automobile sealing strip is obtained through high-temperature hot air shaping, microwave vulcanization, hot air vulcanization, spraying, coating curing, molding, cutting, and butt-jointing processes.

[0040] Among them, the foaming glue and low-density foaming glue begin to foam and set in the above-mentioned microwave vulcanization, hot air vulcanization and other processes. Those skilled in the art can control the material density of the two materials to 0.6±0.1 g / cm by adjusting the process parameters and the material ratio of the foaming glue / low-density foaming glue. 3 and 0.25 - 0.32 g / cm 3 The preferred density of foamed rubber and low-density foamed rubber is 0.65 g / cm 3 and 0.3 g / cm 3 .

[0041] Specifically, 0.25 - 0.32 g / cm 3 The reason why the low-density foam material is used as a substitute for butyl sealant in the inverted U-shaped slot is that the density of the foam material is 0.6±0.1 g / cm 3 The same mass as conventional foam has a larger volume, the material is softer, and if liquid penetrates, the absorption capacity is better, which improves the waterproof effect of the sealing strip. 3If the foaming material is of a lower density, the volume after foaming will be too large, affecting the shape of the sealing teeth, making the sealing strip not firm enough after being inserted into the sheet metal. Density 0.25 - 0.32 g / cm 3 The sealing effect of the foam material and the sheet metal after embedding is 0.35 g / cm 3 The foamed material is superior, mainly because the density is 0.25 - 0.32 g / cm 3 The foam material is softer, has less rebound, is more closely attached to the vehicle sheet metal, has better sealing performance, better waterproof effect, and is more secure when installed on the vehicle. This avoids the problem of inserting sheet metal into high-density foam material (i.e., density ≥ 0.35 g / cm 3 The foam material) is not firmly attached to the vehicle and causes water leakage, thereby improving the sealing and waterproof performance of the vehicle.

[0042] Furthermore, compared with the technical solution of connecting the low-density sponge with the sealing strip body by bonding, the low-density foam glue of the present application is co-extruded with the sealing strip body, and the materials are the same, both EPDM, and the composite performance is more excellent. The sealing strip using bonding technology needs to use tape or glue to connect the low-density sponge with the sealing strip body. On the one hand, the bonding strength between the low-density sponge and the sealing strip body is limited. On the other hand, the use of tape or glue will increase the VOC content of the sealing strip (about 0.2-0.5g / cm higher for a single sealing strip). 3 ), it is difficult to pass the acceptance of the OEM.

[0043] In the four composite sealing strips of the present application, a framework is wrapped in the dense glue to form an inverted U-shaped slot, and a portion of one side outside the slot extends to form a dense glue lip. Figure 1 Viewed from the opposite side, the dense glue lip is slightly higher than the height of the U-shaped slot. When the four-composite sealing strip is installed on the vehicle, the car decorative panel is inserted into the gap between the dense glue lip and the outer wall of the inverted U-shaped slot. The first sealing tooth, the second sealing tooth, and the third sealing tooth are arranged in sequence on one side of the slot from the inside to the outside (that is, from the top of the inverted U-shaped slot to the outside), and the fourth sealing tooth and the fifth sealing tooth are arranged in sequence on another side of the slot from the inside to the outside. Among them: the first sealing tooth, the second sealing tooth and the third sealing tooth extend to the upper right, and the fourth sealing tooth and the fifth sealing tooth extend to the upper left. Several sealing teeth made of dense glue material ensure the convenience of assembly and the strength after assembly, and can adapt to the sheet metal thickness of different models.

[0044] The third sealing teeth are arranged opposite to the fifth sealing teeth, and the third sealing teeth partially protrude to cooperate with the fifth sealing teeth to improve the firmness of the sealing strip, and prevent dust, liquid, etc. from falling into the inverted U-shaped slot before the sealing strip is loaded on the vehicle. The first sealing teeth and the second sealing teeth are arranged opposite to the fourth sealing teeth, and improve the firmness of the sealing strip, and prevent dust, liquid, etc. from falling into the inverted U-shaped slot before the sealing strip is loaded on the vehicle.

[0045] The foam tube, the first foam glue lip, the second foam glue lip, and the third foam glue lip are all made of foam glue. The foam tube is arranged at the upper end of the inverted U shape. The foam tube is hollow and can absorb the sound when the tailgate of the car is closed, and prevent the tailgate sheet metal from colliding with the body sheet metal through deformation. The first foam glue lip is arranged on one side of the dense glue lip. Figure 1 In reverse, the first foam glue lip is slightly higher than the height of the dense glue lip. When loading, the decorative panel is inserted into the gap between the first foam glue lip, the dense glue lip and the outer wall of the inverted U-shaped slot.

[0046] The second foam rubber lip is arranged on one side outside the slot and is designed to be slanted to the lower left. The design purpose of this structure is to cover the gap in the sheet metal.

[0047] The third foam rubber lip is arranged at the top of one of the two walls of the slot and abuts against the sheet metal. The design purpose of this structure is to prevent dust and water from entering the inverted U-shaped slot.

[0048] A mold is used to produce the above-mentioned four-composite automobile sealing strip. The specific production process is detailed in the above-mentioned materials.

[0049] A car is equipped with the above-mentioned four-composite car sealing strip.

[0050] The four-composite sealing strip of the material applied for avoids the problem that the traditional tailgate sealing strip needs to use butyl rubber sealant to offset the sheet metal and easily cause body pollution. At the same time, low-density foaming material is selected to be extruded and vulcanized together with the sealing strip body, so that the low-density foaming glue is more firmly combined with the sealing strip body, overcoming the defects of some manufacturers using the bonding method that easily causes the connection between the two to be loose and the overall odor of the sealing strip.

[0051] The above is only a preferred embodiment of the present application and does not constitute any other form of limitation to the present application. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the protection scope of the technical solution of the present application.

Claims

1. A four-composite automobile sealing strip, which is made by extruding a dense rubber, a skeleton, a foaming rubber and a low-density foaming rubber, and is characterized by: The dense glue is coated with a frame to form an inverted U-shaped slot, and the low-density foamed glue is arranged on the top of the inverted U-shaped slot; After the automobile sealing strip is installed, the sheet metal is against the low-density foam rubber, and a plurality of sealing teeth are arranged in the inverted U-shaped slot to fix the automobile sealing strip on the sheet metal; A second foam rubber lip is provided for covering the sheet metal gap.

2. The four-composite automotive sealing strip according to claim 1, characterized in that: The low-density foam rubber is EPDM foam rubber.

3. A four-composite automotive sealing strip according to claim 2, characterized in that: The density of the low-density foamed rubber is 0.25-0.32 g / cm 3 .

4. The four-composite automotive sealing strip according to claim 1, characterized in that: The third sealing tooth is arranged opposite to the fifth sealing tooth, and the third sealing tooth partially protrudes to cooperate with the fifth sealing tooth to enhance the firmness of fixing the sealing strip.

5. The four-composite automotive sealing strip according to claim 1, characterized in that: A third foam rubber lip is provided to abut against the sheet metal for dust and water prevention.

6. The four-composite automotive sealing strip according to claim 1, characterized in that: The decorative panel is inserted into the gap between the dense glue lip and the inverted U-shaped slot.

7. The four-composite automotive sealing strip according to claim 1, characterized in that: The first foaming adhesive lip is arranged on one side of the dense adhesive lip.

8. A mold, characterized in that: Used for producing the four-composite automobile sealing strip described in any one of claims 1-7.

9. A car, characterized in that: The automobile sealing strip having the four-composite structure described in any one of claims 1 to 7 is installed.

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