JP2006282026A - Sealant for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent urethane paint from peeling off due to strong abrasion of window glass, and prevent generation of noise during elevating the window glass without degrading original seal performance of a seal lip in a sealant for an automobile providing preferable sliding property on the window glass by applying the urethane paint to the seal lip which is brought into elastic contact with the glass window for sealing. <P>SOLUTION: This sealant has a bottom wall 2, side walls 3 on both edges of the bottom wall, the seal lips 7, 8 which are extended on an inner side of the body from both the side wall edges and brought into elastic contact with the window glass 6. In a glass run 21 which is attached at a channel 9 of a window frame, a bridging polyethylene layer 22 is provided at top edge parts of the seal lips 7, 8 and the urethane paint is applied onto that to form an urethane paint film 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealing material such as a weather strip and a glass run provided with a sealing lip that elastically contacts a window glass that can be raised and lowered in an automobile door.

  The vehicle door 1 shown in FIG. 4 includes a main body 5 having a substantially U-shaped cross section with a bottom wall 2 and side walls 3 and 4 at both ends of the bottom wall, as shown in FIG. A glass run 10 is attached to the channel 9 of the window frame, and includes a seal lip 7 and 8 that extends further to the inside of the main body and elastically contacts the window glass 6, and the waistline has, for example, as shown in FIG. A weather strip 14 having a pair of seal lips 11 and 12 elastically contacting the window glass 6 and being attached to the door trim 13 is attached.

The glass run and weatherstrip described above are known in which urethane coating is applied to places where good slidability with the window glass is required, such as a seal lip and a glass run bottom wall. A glass run in which a silane-crosslinked polyethylene layer is provided on the glass runn bottom wall and urethane coating is applied thereon is disclosed.
JP 2002-30247 A

  It is inevitable that the window glass of an automobile door has a slight variation in the mounting position. In the case of a glass run due to the variation in the mounting position, the window glass may strongly hit one of the sealing lips and the bottom wall of the glass run. When the window glass moves up and down in this state, the urethane coating is peeled off, and noise may be generated by rubbing against the window glass when the window glass is moved up and down.

  Like the glass run disclosed in Patent Document 1, if a cross-linked polyethylene layer is provided and urethane coating is applied thereon, the cross-linked polyethylene may be peeled off even if the window glass slides and the urethane coating is peeled off. However, since it exhibits slidability and wear resistance, good slidability with respect to the window glass can be maintained over a long period of time, and generation of abnormal noise can be prevented.

  Since good slidability and abrasion resistance with the window glass are also required for the seal lip, it is conceivable that a polyethylene layer is provided on the base of the urethane paint on the seal lip as well. Since the polyethylene layer has a relatively high hardness, when it is provided on the seal lip, special care must be taken so that the flexibility of the seal lip is impaired and the sealing performance with the window glass is not impaired.

  This invention is made in view of this point, and provides the sealing material for motor vehicles provided with the sealing lip which has favorable slidability with a window glass, and abrasion resistance, without impairing sealing performance. With the goal.

  The present invention provides a sealing material such as a weather strip or a glass run having a sealing lip that elastically contacts a window glass that can be raised and lowered of an automobile door, and includes a contact surface with the window glass among the sealing lips, A polyolefin layer is provided only on the surface except the bent portion that bends and bends the most when it hits the window glass, preferably the contact surface with the window glass at the tip of the seal lip, and urethane coating is applied thereon. .

  Examples of the polyolefin of the polyolefin layer formed on the seal lip include polyethylene, polypropylene, polybutene, etc. Among them, cross-linked polyethylene having a molecular weight of tens of thousands to 200,000 and ultrahigh molecular weight polyethylene having a molecular weight of 1,000,000 to 3,000,000 are mentioned. desirable.

  Moreover, as for the thickness of a polyolefin layer, 30-150 micrometers is desirable. When the thickness of the polyolefin layer is 30 μm or less, the slidability and wear resistance are poor, and when it exceeds 150 μm, the wear resistance is excellent, but the sliding resistance increases, which is not preferable.

  The polyolefin layer can be formed by co-extrusion with a rubber such as EPDM or thermoplastic elastomer TPE constituting the sealing material, or can be formed by attaching a polyolefin film immediately after the sealing material is extruded.

  The urethane coating layer may be oily, but an aqueous paint is preferably used from the viewpoint of environmental hygiene. Water-based paints are curable urethane emulsion paints containing isocyanate curing agents, melamine curing agents, epoxy curing agents, carbodiimide curing agents, etc., silane coupling agents having amino groups, and silane cups having epoxy groups. Two or more types of ring agents, silane coupling agents having a methacryloxy group, and silane coupling agents having an acryloxy group are added, or these two or more types of silane coupling agents are mixed in advance and mixed. The product is added.

  When the seal lip of the sealing material is hit against the window glass, the base is generally bent and bent most greatly, and is bent more gently, and at least the tip is elastically contacted with the window glass. According to the seal material, since the seal lip does not have the polyolefin layer at the base bent portion, the bent portion at the base is bent and bent like the conventional seal lip, so that at least the tip portion is a window. Since it comes into elastic contact with the glass and the sealing performance is not particularly impaired, the seal lip can be bent outward at the base bend and can be opened outward or closed inward. The polyolefin layer does not impair the ability to follow the curved part when it is attached to the window frame or the curved part of the vehicle body, and the urethane coating on the surface may be peeled off. Because having a sliding property and wear resistance, can be prevented rubbed on the window glass when the window glass elevating the abnormal noise over a long period of time, an effect equal.

When the polyolefin layer is provided only at the tip of the seal lip, the flexibility of the seal lip can be maintained in the same way as the previous seal lip, and the sealing performance and followability to the curved part are the same as the previous seal lip. You can have it.
When the polyolefin layer is made of crosslinked polyethylene, the slidability and wear resistance are further improved.

  Hereinafter, a glass run according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the same components as those in FIG.

  FIG. 1 shows a cross section of a glass run 21, and FIG. 2 shows a state in which the glass run 21 shown in FIG. 1 is mounted on a channel 9 of a window frame. The difference from the glass run 10 shown in FIG. A cross-linked polyethylene layer 22 is provided at the tip of seal lips 7 and 8 that are in elastic contact with the glass 6, and a urethane paint is applied to the surfaces of the seal lips 7 and 8 including the cross-linked polyethylene layer 22 to form a urethane coating film 23. Is a point.

  Although the glass run 21 of this embodiment does not provide the cross-linked polyethylene layer on the bottom wall 2, as in the glass run disclosed in Patent Document 1, the cross-linked polyethylene layer is provided on the bottom wall 2, and the urethane coating is provided thereon. It may be formed.

  FIG. 3 shows a cross section of the weather strip 25 provided on the waist line. The difference from the weather strip 13 shown in FIG. 6 is that a cross-linked polyethylene layer is formed on each end of the seal lips 11 and 12 that elastically contact the window glass 5. 26, and further, urethane paint is applied to the surfaces of the seal lips 11 and 12 including the crosslinked polyethylene layer 26 to form a urethane coating film 27.

  The above embodiment shows an example in which the present invention is applied to a glass run or weatherstrip seal lip, but is attached to a weatherstrip seal lip attached to the roof side edge of a hard-top car, or a hood side edge of a convertible car. The same can be applied to the sealing lip of the weather strip.

  Therefore, the sealing material of the present invention seals and seals against window glass such as a glass run, a weather strip of a waist line, a weather strip attached to a roof side edge of a hardtop car, a weather strip attached to a hood side edge of a convertible car. It can be used as a sealing material provided with a sealing lip.

Sectional drawing of the glass run in the 1-1 line | wire of FIG. Sectional drawing which attached the glass run shown in FIG. 1 to the channel. Sectional drawing of the weather strip in the 3-3 line of FIG. A side view of an automobile. Sectional drawing of the conventional glass run in the 1-1 line | wire of FIG. Sectional drawing of the conventional weather strip in the 3-3 line.

Explanation of symbols

1..Automobile door 2..Bottom wall 3, 4..Side wall 5..Main body 6..Window glass 7, 8, 11, 12..Slip lip 9..Channel 10, 21..Glass run 13 .. Door trim 14, 25 ... Weather strip 22, 26 ... Crosslinked polyethylene layer 23, 27 ... Urethane coating

Claims (4)

  In the automotive sealing material provided with sealing lips 7, 8, 11, and 12 that elastically contact the window glass 6 that can be raised and lowered of the automotive door 1, of the sealing lips 7, 8, 11, and 12, the window glass 6 A sealing material for automobiles, which includes a contact surface and is provided with polyolefin layers 22 and 26 on a surface excluding the bent portion of the base that is bent and bent most greatly when hitting the window glass 6, and is provided with coatings 23 and 27 thereon. .   2. The automobile sealing material according to claim 1, wherein the polyolefin layers 22 and 26 are provided only on a contact surface of the seal lip tip with the window glass 6.   The automobile sealing material according to claim 1, wherein the polyolefin layers 22 and 26 are made of crosslinked polyethylene.   The automobile sealing material according to any one of claims 1 to 3, wherein the polyolefin layers 22 and 26 have a thickness of 30 to 150 µm.

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