Weatherstrip

Abstract

A weatherstrip is provided that can improve abrasion resistance by a coating film formed on the surface of a hollow seal portion. [Solution] A weatherstrip (200) comprising a mounting base (10) that is attached to the periphery of a vehicle's opening / closing body (1) or the periphery of an opening in a body (2), and a sealing portion (20) that is integrally molded with the mounting base (10) and elastically contacts the periphery of the opening on the body (2) side or the periphery of the opening on the opening / closing body (1) side when the opening / closing body (1) is closed, and a coating (50) is formed on the surface of the sealing portion (20), and the coefficient of dynamic friction of the coating (50) against fabric is less than 0.30.

Description

[Technical Field]

[0001] The present invention relates to a weatherstrip that is attached to the periphery of an opening / closing body such as an automobile side door, back door, trunk lid, or hood, or to the periphery of an opening in the body, and elastically contacts the body side or the opening / closing body when the opening / closing body is closed, thereby sealing between the opening / closing body and the body. [Background technology]

[0002] Conventionally, as shown in Figures 1 and 2, a weatherstrip (door weatherstrip) has been known which includes an attachment base 10 that is attached to the periphery of an opening / closing body 1 such as a vehicle door or the periphery of an opening in a body 2, and a hollow sealing portion 20 with a coating film 50 formed on its surface that is integrally molded with the attachment base 10 and elastically contacts the periphery of the opening on the body 2 side or the periphery of the opening on the opening / closing body 1 side when the opening / closing body 1 is closed (see, for example, Patent Document 1).

[0003] Furthermore, a method is known in which a coating of a solid material is formed on the surface of the hollow seal portion 20 to prevent the surface from being worn down due to repeated rubbing against clothing, luggage, etc. when a person gets into a vehicle (see, for example, Patent Document 2). Alternatively, a method is known in which only the parts of the hollow seal portion 20 that are prone to rubbing are made of a solid material (see, for example, Patent Document 3).

[0004] However, solid materials are more difficult to deform than sponge materials, and forming a coating or forming part of the hollow seal portion 20 from a solid material increases the force required to deform the hollow seal portion, raising concerns that this could lead to a deterioration in the door's ability to close. On the other hand, in Patent Document 2, the hollow seal portion 20 itself is made of sponge rubber with a specific gravity of 0.9±0.1 in order to improve physical strength and abrasion resistance, but the problem of difficulty in deforming it because it is similar in nature to a solid material still remains.

[0005] In view of these problems, the inventor conducted repeated trial and error experiments to see if improvements could be made by focusing on the coating film 50 formed on the surface of the hollow seal portion 20, since it is the surface of the hollow seal portion 20 that comes into contact with people's clothing, luggage, etc., rather than the material of the hollow seal portion 20 itself.As a result, the inventor arrived at the present invention. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7418641 [Patent Document 2] Japanese Patent Application Publication No. 7-137583 [Patent Document 3] Japanese Patent Application Laid-Open No. 2018-39499 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a weatherstrip that can improve abrasion resistance by means of a coating film formed on the surface of the hollow seal portion. [Means for solving the problem]

[0008] In order to achieve the above object, the weatherstrip of the present invention is a weatherstrip (200) comprising an attachment base (10) attached to the periphery of an opening / closing body (1) or the periphery of an opening in a vehicle body (2), and a seal portion (20) integrally formed with the attachment base (10) and elastically contacting the periphery of the opening in the body (2) or the periphery of the opening / closing body (1) when the opening / closing body (1) is closed, A coating film (50) is formed on the surface of the seal portion (20), The coefficient of dynamic friction of the coating film (50) against fabric is 0.22 or more and less than 0.30, The coefficient of dynamic friction of the coating film against fabric is measured at an ambient temperature of 23°C by pressing a watch glass with No. 6 cotton canvas attached to its underside against a 40mm x 100mm flat specimen made by cutting the seal of the weather strip with a load of 1kgf, and moving the watch glass and specimen relative to each other for 50mm at a speed of 1000mm / min. It is characterized by:

[0011] The present invention is also characterized in that the coating film (50) is formed from a paint containing a base agent, a hardener, and a filler.

[0012] The present invention is also characterized in that the coefficient of dynamic friction of the coating film (50) against fabric is adjusted by the average particle size and the number of parts of the filler.

[0013] It should be noted that symbols in parentheses indicate corresponding elements or matters described in the drawings and in the detailed description to be described later. [Effects of the Invention]

[0014] According to the present invention, in a weatherstrip comprising a mounting base that is attached to the periphery of a vehicle's opening / closing body or the periphery of a body opening, and a sealing portion that is integrally molded with the mounting base and elastically contacts the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, a coating film is formed on the surface of the sealing portion, and the dynamic friction coefficient of the coating film against fabric is less than 0.30, so that the wear resistance is excellent and the sealing portion is prevented from easily tearing even if the surface of the sealing portion rubs against clothing, luggage, etc. repeatedly when a person gets into the vehicle. This makes manufacturing easy because it is only necessary to select in advance a paint that will make the coefficient of dynamic friction of the coating film against the fabric less than 0.30, and there is no need to form a coating of solid material on the surface of the hollow seal part or to form solid material only in areas that are prone to rubbing, as shown in the conventional example.

[0015] Furthermore, according to the present invention, the coefficient of dynamic friction of the coating film against fabric is set to 0.22 or more, so that noises caused by rubbing between smooth surfaces while the vehicle is running can be prevented.

[0016] Furthermore, according to the present invention, the dynamic friction coefficient of the coating film against the fabric is adjusted by the average particle size and the number of parts of the filler blended, making it possible to provide a weatherstrip in which a coating film made using a paint formulated with both abrasion resistance and noise prevention properties in mind is formed on the sealing portion. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing a weatherstrip 200 according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view showing a state in which the weatherstrip 200 shown in FIG. 1 is in elastic contact. FIG. [Figure 3] FIG. 1 illustrates a coating formulation according to an embodiment of the present invention. [Figure 4] FIG. 1 is a graph showing the results of measuring the coefficient of dynamic friction against fabric for coating films of various formulations formed on flat sponge rubber plates. [Figure 5] FIG. 10 is a diagram showing the evaluation results of abrasion resistance of a product. DETAILED DESCRIPTION OF THE INVENTION

[0018] A weatherstrip 200 according to an embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, this weatherstrip 200 comprises a mounting base 10 that is attached to the opening / closing body 1 of a vehicle, in this case the side door 1, and a hollow sealing portion 20 made of sponge rubber that is integrally molded with the mounting base 10 and comes into elastic contact with the periphery of the opening of the body 2 when the side door 1 is closed, and which has a coating film 50 formed on its surface.

[0019] Considering abrasion resistance, we conducted an experiment using the paint formulation shown in Figure 3 to determine what type of coating would be suitable. These all used a water-based urethane resin (or a water-based silicone resin) as the base, ion-exchanged water as the diluent, and polycarbodiimide as the curing agent. The weight ratio was 100 parts by weight of the base, 30 parts by weight of the diluent, and 2.5 parts by weight of the curing agent. Silicone rubber (compounds 1 to 6) and acrylic resin (compounds 7 to 12) were also used as fillers.

[0020] In compound 1 (total parts 137.5), 5 parts by weight of silicone rubber A with an average particle size of 5 μm was blended as a filler, in compound 2 (total parts 142.5) 10 parts by weight, and in compound 3 (total parts 152.5) 20 parts by weight. In compound 4 (total parts 137.5), 5 parts by weight of silicone rubber B having an average particle size of 20 μm was blended as a filler, in compound 5 (total parts 142.5) 10 parts by weight, and in compound 6 (total parts 152.5) 20 parts by weight. Blend 7 (total parts 137.5) contained 5 parts by weight of acrylic resin C with an average particle size of 5 μm as a filler, Blend 8 (total parts 142.5) contained 10 parts by weight, and Blend 9 (total parts 152.5) contained 20 parts by weight. In blend 10 (total parts 137.5), 5 parts by weight of acrylic resin D with an average particle size of 20 μm was blended as a filler, in blend 11 (total parts 142.5) 10 parts by weight, and in blend 12 (total parts 152.5) 20 parts by weight.

[0021] Next, the coefficients of dynamic friction against fabric for the coating films formed with the paints of Blends 1 to 12 were measured, and the results are shown in FIG. The method for measuring the dynamic friction coefficient was the same as that disclosed in Japanese Patent Laid-Open Publication No. 9-123761. The measuring instrument used was a surface property measuring instrument "HEIDON-14D" manufactured by Shinto Scientific Co., Ltd., and a watch glass with cotton canvas No. 6 attached to its surface. Specifically, a watch glass with No. 6 cotton canvas attached to its underside was pressed against a sample made of a 40mm x 100mm piece of extruded sponge rubber (specific gravity 0.55) cut into a flat plate to form a coating film on its surface, with a load of 1kgf, and the watch glass and the flat sponge rubber (sample) were moved relative to each other for 50mm at a speed of 1000mm / min to measure the coefficient of dynamic friction. The measurement ambient temperature was 23°C.

[0022] According to this, the results were 0.22 for Blend 1, 0.26 for Blend 2, 0.25 for Blend 3, 0.24 for Blend 4, 0.27 for Blend 5, 0.30 for Blend 6, 0.25 for Blend 7, 0.26 for Blend 8, 0.25 for Blend 9, 0.26 for Blend 10, 0.32 for Blend 11, and 0.35 for Blend 12. In addition, for conventional paint A, which was used as a comparative example, the result was 0.41, and for conventional paint B, the result was 0.34.

[0023] The evaluation results of the abrasion resistance of the products on which the coating films of the paints of Blends 1 to 12 were formed are shown in FIG. The abrasion resistance evaluation method used was that disclosed in JP 2018-39499 A, in which a 3 kg abrasive (with a denim fabric surface) was placed on the hollow seal of the evaluation product and rubbed against the surface of the hollow seal of the evaluation product at a speed of 24 times per minute, matching the angle at which people get in and out of vehicles. The condition of the hollow seal was checked every 100 times and the number of times until the hollow seal broke was recorded (hereinafter, the number of times until breakage occurs may be referred to as the "breakage occurrence number"). For example, if the breakage occurrence number was 2800 times, the hollow seal broke between 2701 and 2800 rubs.

[0024] According to this, in Example 1, when a coating of paint of blend 1 was formed on the hollow seal part of in-house product A, the number of times until tearing occurred was 2800 times, in Example 2, 2500 times for a coating of paint of blend 2, in Example 3, 2200 times for a coating of paint of blend 3, in Example 4, 2500 times for a coating of paint of blend 4, in Example 5, 2000 times for a coating of paint of blend 5, 1400 times for a coating of paint of blend 6, 2800 times for a coating of paint of blend 7, 2400 times for a coating of paint of blend 8, 2500 times for a coating of paint of blend 9, 2500 times for a coating of paint of blend 10, 1400 times for a coating of paint of blend 11, and 1200 times for a coating of paint of blend 12.

[0025] In Example 13, when a coating film of Blend 1 was formed on the hollow seal of another in-house product, Product B, the number of times until breakage occurred was 7,300. When the hollow seal of the product of Example 13 was cut into a flat plate as a sample, the dynamic friction coefficient against fabric was 0.26.

[0026] In addition, as Comparative Example 1, when a coating film of conventional paint A was formed on the hollow seal portion of in-house product A as shown in Figure 4, the number of times until breakage occurred was 1,400. In addition, as shown in Figure 4, when a coating film of conventional paint A was applied to the hollow seal of in-house product B as comparative example 2, the number of times until breakage occurred was 3,500. When the hollow seal of the product of comparative example 2 was cut into a flat plate as a sample, the dynamic friction coefficient against fabric was 0.33. In addition, as Comparative Example 3, commercially available product C, which had coating film C formed on the hollow seal portion, was used 1,400 times before breaking. When the hollow seal portion of commercially available product C was cut into a flat plate as a sample, the dynamic friction coefficient against fabric was 0.41. In addition, as Comparative Example 4, commercially available product D, which had coating film D formed on the hollow seal portion, was used 750 times before breaking. When the hollow seal portion of commercially available product D was cut into a flat plate as a sample, the dynamic friction coefficient against fabric was 0.44.

[0027] The dynamic friction coefficient against fabric shown in Fig. 5 is the dynamic friction coefficient against fabric when the hollow seal portion of the product is cut into a flat plate and used as a sample, and therefore differs from the dynamic friction coefficient against fabric when a 40 mm x 100 mm plate of sponge rubber (specific gravity 0.55) extruded and molded into a base material is cut into a plate and a coating film is formed on the surface, as shown in Fig. 4. In Examples 1 to 12 and Comparative Example 1, there are no measurements of the dynamic friction coefficient against fabric using cut-out product pieces.

[0028] According to the evaluation results of the abrasion resistance of the products shown in Figure 5, in Examples 6 and 12, in which a coating film was formed using a paint containing a large average particle size (20 μm) and a large weight part (20 parts by weight) of filler, the number of times until breakage occurred was 1,400 for Example 6 and 1,200 for Example 12. This is the same as or lower than Comparative Example 1, which showed breakage of 1,400 times, i.e., in-house product A, which was formed using a coating film of conventional paint A with a dynamic friction coefficient against fabric of 0.41 (Figure 4), resulting in inferior abrasion resistance.

[0029] Furthermore, both Example 13 and Comparative Example 2 used the same in-house product B for evaluation. However, Example 13, in which a coating film of the paint of Blend 1, which has a dynamic friction coefficient against fabric of 0.22 (Fig. 4), was formed, experienced 7,300 breaks, whereas Comparative Example 2, in which a coating film of the conventional paint A, which has a dynamic friction coefficient against fabric of 0.41 (Fig. 4), experienced 3,500 breaks. This shows that the coating film of the paint of Blend 1 has approximately twice the abrasion resistance of the coating film of the conventional paint A.

[0030] As in Comparative Example 3, commercial product C, which was formed with coating film C having a dynamic friction coefficient against fabric of 0.41 (FIG. 5), broke 1,400 times, which was the same result as in Comparative Example 1. Also, as in Comparative Example 4, commercial product D, which was formed with coating film D having a dynamic friction coefficient against fabric of 0.44 (FIG. 5), broke 750 times, which was quite poor in abrasion resistance.

[0031] If we consider a coating film with better abrasion resistance than Comparative Example 1, for example, a coating film with a breakage frequency of 1,400 times that of Comparative Example 1, i.e., a breakage frequency of 2,100 or more, then the coating films of Examples 1 to 4 and Examples 7 to 10 would fall into this category based on the abrasion resistance evaluation in Figure 5. In this case, the dynamic friction coefficient of the coating film against the fabric would be 0.22 or more and 0.26 or less, based on the description in Figure 4.

[0032] Furthermore, if the coating film breaks more than 2000 times, this also applies to the coating film of Example 5, and the dynamic friction coefficient of the coating film against the fabric is 0.22 or more and 0.27 or less, as shown in Figure 4.

[0033] Furthermore, assuming that the coating film in Comparative Example 1 had a breakage frequency of 1,400 or more, the coefficient of dynamic friction against the fabric in Example 6, which also had a breakage frequency of 1,400, was 0.30, so the coefficient of dynamic friction would be 0.22 or more but less than 0.30. This is because if the coefficient of dynamic friction were less than 0.30, it would be expected that the breakage frequency would be 1,400 or more.

[0034] However, if the coating surface becomes too smooth, there is a concern that noise may be generated due to the coating rubbing against the smooth surface of the vehicle body while the vehicle is running. If the dynamic friction coefficient is smaller than that of Example 1, the coating surface may become even smoother, so it is preferable that the dynamic friction coefficient of the coating against the fabric is equal to or greater than 0.22 of Example 1.

[0035] Therefore, when selecting a coating film that is better than the conventional paint (Comparative Example 1) in consideration of abrasion resistance, the coating film is required to have a dynamic friction coefficient against fabric of less than 0.30, and more preferably 0.26 or less. Taking into consideration noise prevention performance, the coefficient of dynamic friction of the coating film against fabric is required to be 0.22 or more and less than 0.30, and more preferably 0.22 or more and 0.26 or less.

[0036] In this weatherstrip 200 in which a coating film is formed on the surface of the hollow seal portion 20, the coefficient of dynamic friction of the coating film against fabric is less than 0.30, so that the wear resistance is excellent and the seal portion is prevented from easily tearing even if the surface of the seal portion rubs repeatedly against clothing, luggage, etc. when a person gets into a vehicle. This makes manufacturing easy because it is only necessary to select in advance a paint that will make the coefficient of dynamic friction of the coating film against the fabric less than 0.30, and there is no need to form a coating of solid material on the surface of the hollow seal part or to form solid material only in areas that are prone to rubbing, as shown in the conventional example.

[0037] Furthermore, the coefficient of dynamic friction of the coating film against fabric is set to 0.22 or more, which prevents the generation of abnormal noises caused by rubbing between smooth surfaces while the vehicle is running.

[0038] Furthermore, the dynamic friction coefficient against the fabric is adjusted by adjusting the average particle size and the number of parts of the filler, so it is possible to provide a weatherstrip 200 in which a coating film made using a paint formulated with both abrasion resistance and noise prevention properties in mind is formed on the hollow seal portion 20.

[0039] In this embodiment, the door weatherstrip 200 is attached along the periphery of the side door 1 and elastically contacts the periphery of the opening of the body 2, but the door weatherstrip may be attached along the periphery of the opening of the body 2 and elastically contacts the periphery of the side door 1 when the door is closed. The invention is also applicable to any weatherstrip, such as a weatherstrip attached to an opening / closing body such as a back door, trunk lid, or hood of an automobile. [Explanation of symbols]

[0040] 1 Opening and closing body (side door) 2 Body 10 Mounting base 20 Hollow seal part 50 coating 200 Weatherstrip

Claims

1. A weatherstrip comprising: an attachment base portion attached to a periphery of an opening / closing body or a periphery of a body opening of a vehicle; and a seal portion integrally formed with the attachment base portion and elastically contacting the periphery of the body opening or the periphery of the opening / closing body when the opening / closing body is closed, A coating film is formed on the surface of the sealing portion, The coefficient of dynamic friction of the coating film with respect to fabric is 0.22 or more and less than 0.30, A weatherstrip characterized in that the dynamic friction coefficient of the coating film against the cloth is measured by pressing a watch glass with cotton canvas No. 6 attached to its underside against a flat sample of 40 mm x 100 mm made by cutting the sealed portion of the weatherstrip with a load of 1 kgf, and moving the watch glass and the sample relative to each other for 50 mm at a speed of 1000 mm / min, when the measurement ambient temperature is 23°C.

2. 2. The weather strip according to claim 1, wherein the coating film is formed from a paint containing a base agent, a curing agent, and a filler.

3. 3. The weatherstrip according to claim 2, wherein the coefficient of dynamic friction of the coating film against the fabric is adjusted by adjusting the average particle size and the number of parts of the filler.

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