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JP-2026076065-A - Weatherstrip

JP2026076065AJP 2026076065 AJP2026076065 AJP 2026076065AJP-2026076065-A

Abstract

[Problem] To provide a weatherstrip that maintains noise prevention even when fillers are present in the coating film formed on the surface, while also ensuring watertightness. [Solution] A weatherstrip 200 comprising a mounting base 10 attached to the periphery of a vehicle opening/closing body 1 or the periphery of an opening in the body 2, and a sealing portion 20 integrally molded with the mounting 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, wherein the sealing portion 20 has a coating film 50 formed on its surface in which a filler 70 is added to the base 60, and the particle size of the filler 70 (70A) that protrudes the most from the base 60 is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less. [Selection Diagram] Figure 4

Inventors

  • 村井 友亮
  • 松本 圭吾

Assignees

  • 西川ゴム工業株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (7)

  1. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening/closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base 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, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle size of the filler that protrudes most from the base is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.
  2. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening/closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base 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, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the maximum particle size of the filler contained in the base is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.
  3. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening/closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base 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, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle size of the filler located on the outermost surface of the sealing portion is 15 to 20 μm, and its 10% deformation strength is 0.1 MPa or less.
  4. A weatherstrip comprising a mounting base attached to the periphery of a vehicle's opening/closing body or the periphery of a body opening, and a sealing portion integrally molded with the mounting base 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, in which a base to which fillers of multiple particle sizes are added. A weatherstrip characterized in that the particle diameter of the filler that protrudes most from the base is 15 μm or more, and its 10% deformation strength is 0.1 MPa or less.
  5. The weatherstrip according to any one of claims 1 to 4, characterized in that the base has a hardness of 46 MPa or less when measured with a nanoindentation tester with the maximum indentation load of the indenter set to 20 μN.
  6. The weatherstrip according to claim 1, characterized in that the thickness of the base is 20 μm or less.
  7. The weatherstrip according to claim 5, characterized in that the thickness of the base is 20 μm or less.

Description

This invention relates to a weatherstrip that is attached to the periphery of an opening or closing mechanism such as a side door, back door, trunk lid, or hood of an automobile, or to the periphery of an opening in the body, and which elastically contacts the body side or the opening or closing mechanism when it is closed, thereby sealing the space between the opening or closing mechanism and the body. Conventionally, as shown in Figures 1 and 2, a weatherstrip (door weatherstrip) 200 is known, comprising a mounting base 10 attached to the periphery of an opening/closing body 1 such as a vehicle door, and a hollow sealing portion 20 integrally molded with the mounting base 10, which elastically contacts the opening periphery on the body 2 side when the opening/closing body 1 is closed, and which has a coating film 50 formed on its surface (see, for example, Patent Document 1). Furthermore, it is known that fillers such as silicone particles and polyurethane gel particles are added to the coating 50 of automotive weatherstrips in order to improve noise prevention (see Patent Documents 2 and 3). The noise referred to here is the squeaking sound that occurs when the body and weatherstrip slide against each other due to vibrations during driving, and is particularly likely to occur when the weatherstrip is slightly wet, such as in rainy weather, and is one of the causes of deterioration in vehicle quality. By adding fillers, the slipperiness is improved and the occurrence of squeaking sounds can be reduced. On the other hand, as shown in Table 1, while larger particle size fillers improve noise prevention, they tend to have worse water-sealing properties compared to smaller particle size fillers. This is thought to be due to the effect of a minute gap being created between the filler on the surface of the coating 50 of the seal portion 20 and the body 2 when the opening/closing body 1 is closed and the weatherstrip 200 comes into contact with the body 2. In other words, as shown in Figure 3(a), when a filler with a small particle size is added, the gap is smaller compared to a filler with a large particle size, so the amount of water that can penetrate is small and the water-sealing performance is good. On the other hand, as shown in Figure 3(b), when a filler with a large particle size is added, the gap is larger compared to a filler with a small particle size, so the water-sealing performance is considered to be worse. Thus, conventional automotive weatherstrips, which have a coating film with fillers added to the surface of the sealing portion, have had conflicting properties in terms of noise prevention and watertightness. Patent No. 7418641Japanese Patent Publication No. 2009-1710Japanese Patent Publication No. 2000-313234 This is a cross-sectional view showing a weatherstrip 200 according to an embodiment of the present invention.Figure 1 is a cross-sectional view showing the weatherstrip 200 in a bent state.This is an enlarged cross-sectional view taken along line A-A in Figure 2, schematically showing the main part of a weatherstrip 200 with a coating film formed on it, according to a conventional example.This is an enlarged cross-sectional view taken along line A-A in Figure 2, schematically showing the main part of a weatherstrip 200 on which a coating film according to an embodiment of the present invention is formed.This is an enlarged cross-sectional view schematically showing the main part of a weatherstrip 200 on which another coating film according to an embodiment of the present invention is formed.Figure 5 is an enlarged cross-sectional view showing the state of wear on the surface of the coating film. A weatherstrip 200 according to an embodiment of the present invention will be described with reference to Figures 1, 2, and 4. This weatherstrip 200 includes a mounting base 10 that is attached to the opening/closing body 1 of the vehicle, in this case the side door 1, and a hollow sealing portion 20 made of sponge rubber with a coating 50 formed on its surface that is integrally molded with the mounting base 10 and elastically contacts the periphery of the opening 2 of the body 2 when the side door 1 is closed. Note that the thickness of the coating film 50 shown in the drawing is for illustrative purposes only. The actual thickness of the coating film is measured in microns (μm), while the thickness of the hollow seal portion 20 is measured in millimeters (mm). Therefore, the thickness of the coating film is on the order of approximately 1/1000th of the thickness of the hollow seal portion 20. As the sponge rubber constituting the hollow seal portion 20 of the weatherstrip 200 according to the embodiment of the present invention, a material with a specific gravity of 0.40 was used. The specific gravity can be determined by separating the hollow seal portion 20 of the weatherstrip 200 by cutting it out, and then using the underwater displacement method. The hollow seal portion 20 is made of a