JPH11227457A - Weather strip for automobile and molding method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably toughen a weather strip and improve flaw resistance and chemical resistance by pilingly laminating a main body of a hard polypropylene resin and an intermediate adhesive layer of olefin thermoplastic elastomer, and pilingly fitting thin coating layer such as ethylene (metha) acrylic acid copolymer to the exposed surface. SOLUTION: A weather strip main body 1 is integratedly formed out of a vertical supporting piece 2 and a slant pressure contact piece 3 positioned outside out of a hard polypropylene resin of a hard olefin synthetic resin. Further, the surface of the slant pressure contact piece 3 is composed of a thin film-like intermediate adhesive layer 5 made of olefin thermoplastic elastomer, and a thin coating layer 6 of a synthetic resin made of compound such as ethylene (metha) acrylic acid copolymer or metallic salt of it on the surface. These are integratedly molded by simultaneously operating three extrusion molding machines. Thus it is toughened and can be used for a long term.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip which is mounted on a door panel which is in contact with an elevating glass window of a door portion of an automobile or the like. The present invention relates to an automotive weather strip for integrally forming a thin coating layer having excellent chemical resistance and a method for forming the same.

[0002]

2. Description of the Related Art Conventionally, weather strips of this type of inner molding and outer molding are made of polyvinyl chloride, rubber, and an olefin-based thermoplastic elastomer which softens at room temperature. However, the exposed surface of the conventional weatherstrip is easily damaged or attacked by chemicals. In addition, since the vertical support piece requires rigidity, there is a case where a reinforcing piece made of metal or the like is embedded in an inside of polyvinyl chloride, rubber, or the like with an adhesive or the like as shown in FIG. In this case, the weight is high, the cost is high, and there is a problem that it cannot be recycled.In addition, polyvinyl chloride emits corrosive gas at the time of incineration and causes pollution such as dioxin. It is.

Further, in order to improve the above problem, there is a device using a polypropylene resin. However, there is a problem that a scratch is easily formed on an exposed surface side.
Then, a thin coating layer of an ethylene (meth) acrylic acid copolymer, which is the same olefin resin as polypropylene and has high scratch resistance and chemical resistance, is applied to the surface by extrusion molding, but in this case, the problem is that it is easily peeled off. I got a point.
Therefore, various types of adhesives have been used, but there have been many problems in terms of working and environment due to the drawback of generating a solvent gas during bonding.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and the like. The present invention has been made to solve the above-mentioned problems. An automotive weatherstrip in which an intermediate coating layer serving as an adhesive layer of an intermediate olefin-based thermoplastic elastomer of a combined thin coating layer is formed by extrusion molding, and the whole is strongly polymerized and laminated, and a method of forming the same. The purpose is.

[0005]

In order to achieve the above object, the present invention provides a weatherstrip body (1) mounted inside and outside a door panel of an elevating glass window in a motor vehicle, the vertical strip being made of hard polypropylene resin. (2) and the inclined support piece (3) bent outward are integrally formed. On the inclined support piece (3), a thin intermediate coating layer (5) made of an olefin-based thermoplastic elastomer is polymerized and laminated on the exposed surface, and the intermediate coating layer (5) has an externally exposed surface. A thin film layer (6) of a synthetic resin made of a composition such as an ethylene (meth) acrylic acid copolymer or a metal salt thereof was polymerized. Further, the molding is performed by extruding a mixed synthetic resin obtained by mixing powder such as mica, talc (talc), glass fiber, etc. inside the hard polypropylene resin of the molding body (1). Further, as a molding method of the molding body, the first extruder for forming the molding body includes hard polypropylene resin or mica inside the hard polypropylene resin.
An olefin-based thermoplastic elastomer is injected as a constituent material for forming the intermediate coating layer into the second extruder that injects a mixed resin obtained by mixing powders such as talc (talc) and glass fiber. Further, a composition such as an ethylene (meth) acrylic acid copolymer or a metal salt thereof is injected into the third extruder as a constituent material for forming a thin film layer on the surface exposed to the outside. The first extruder, the second extruder and the third extruder are simultaneously operated, and the thin film on the surface of the weatherstrip body, the intermediate layer and the surface is passed through one mold die. A molding method characterized by integrally molding a layer.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
The glass window (9) of the door (11) of (2) is attached to the upper end of a door panel (10) (10) for guiding and maintaining. The weatherstrip body (1) of the outer molding and the inner molding shown in FIGS. 2 and 3 is made of a rigid olefin-based synthetic resin made of a hard polypropylene resin and has a vertical support piece (2) and an outwardly inclined support piece (3). It is formed integrally. The lip-shaped draining pressure contact piece (7) which comes into pressure contact with the elevating glass window (9) provided on the weatherstrip body (1) is made of a soft olefin-based thermoplastic elastomer or the like. In some cases, a pressure contact thin film (8) having a low frictional resistance provided with a flocked material such as nylon or a rough surface portion made of an olefin-based synthetic resin is provided.

FIG. 4 shows a conventional weatherstrip body (13) having a reinforcing core (1) inside.
5) embedded vertical support piece (14), inclined pressure contact piece (1)
6) and the draining pressure contact pieces (17), (17) are integrally formed. The constituent material is made of polyvinyl chloride, a protective film, a thermoplastic elastomer of an olefin-based synthetic resin, or the like.

[0008] Further, as shown in FIG. 5, a method of forming a weatherstrip will be described.
Is injected into a first extruder (20), which is a hard olefin-based synthetic resin such as polypropylene resin or a mixed resin obtained by mixing powder such as mica, talc (talc), and glass fiber inside the polypropylene resin. Next, an olefin-based thermoplastic elastomer is injected into the second extruder (21) as a constituent material for forming the intermediate adhesive layer (5). The third extruder (22) is provided with a composition such as an ethylene (meth) acrylic acid copolymer or a metal salt thereof as a constituent material for forming the thin film layer (6) located on the outer surface. inject. Then, the first extruder (20), the second extruder (21) and the third extruder (21)
The extruder (22) is operated at the same time, and each of the melted synthetic resins passes through the flow pipes (27) and (27), and the inside of one mold die (23), the main body of the weatherstrip body (1). Intermediate adhesive layer (5) on the surface of the inclined pressure contact piece (3)
And the thin film layer (6) on the surface thereof are integrally polymerized. Then, the molded body (1) is
Moving forward, passing through the cooling water tank (24), the drawer (2
After 5), it is cut to a predetermined size by a fixed-size cutting machine (26) to produce a weather strip.

Next, the polypropylene resin in the hard olefin-based synthetic resin has a JIS A hardness of 90 or more. Further, it is composed of a mixed resin obtained by mixing powder such as mica, talc (talc), glass fiber, etc. inside the polypropylene resin. The lip-shaped drain press contact piece (7) in contact with the elevating glass window (9) is made of an olefin-based thermoplastic elastomer resin having the same properties as rubber and having a JIS A hardness of 50 to 85. The pressure contact thin film (8) in contact with the surface of the elevating glass window (9) is made of fiber such as nylon, urethane coat or a mixed synthetic resin having a different melt viscosity. To form an excellent pressure contact film.

Next, as an experimental example of extrusion, a polypropylene resin is injected into a first extruder (20), heated to about 185 ° C., and then extruded into a second extruder (21).
Is injected with an olefin-based thermoplastic elastomer.
Heat to 85 ° C. and inject a composition such as an ethylene (meth) acrylic acid copolymer or a metal salt thereof for forming the thin film layer (8) into the third extruder (22), and raise the temperature to 160 ° C. The three extrusion molding machines are simultaneously operated by heating and are integrally molded by one mold die (23).

Next, as an experimental example in which powder such as mica, talc (talc), glass fiber, etc. was added to the hard olefin-based resin of the present invention, the following linear expansion coefficient results were obtained. .

[0012]

【table】

[0013]

According to the present invention, as described above, the surface exposed to the outside of the weatherstrip is remarkably tougher than the conventional one, and the scratches and the chemical resistance are remarkably excellent. Has an effect. In addition, since the composition such as the rigid polypropylene of the molding body, the olefin-based thermoplastic elastomer of the intermediate adhesive layer, and the hard ethylene (meth) acrylic acid copolymer or its metal salt on the surface is used, the whole is strong and integrated. It has the effect of being toughened and completely usable for a long period of time without being softened at room temperature unlike conventional olefin-based thermoplastic elastomers. Furthermore, by using a synthetic resin in which powders such as mica, talc (talc), glass fiber, etc. are mixed in an olefin-based synthetic resin polypropylene resin, the whole can be remarkably toughened and the number of shrinkage and expansion due to heat and the like can be increased. Has the excellent effect of reducing the Then, as a molding method of the molding body, the molding is performed by integrally polymerizing the intermediate adhesive layer and the thin film layer in one mold die on the surface side of the inclined support piece molded into the molding body. In addition, the olefin-based thermoplastic elastomer used for the intermediate adhesive layer is interposed, so that the composition such as the rigid polypropylene of the molding body and the ethylene (meth) acrylic acid copolymer or the metal salt thereof on the surface can be obtained. Has an excellent effect that the bonding between the two is firmly adhered and there is no fear of peeling. According to the weatherstrip of the present invention, it can be formed to be extremely light in weight as compared with the conventional constituent materials such as polyvinyl chloride and rubber, and also has a convenient effect such that the material can be recycled again due to its properties. .

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a state where a weatherstrip of the present invention is mounted on a vehicle.

FIG. 2 is a vertical sectional side view taken along the line 1A-A of FIG. 1;

FIG. 3 is a partially enlarged longitudinal side view of the weatherstrip body of the present invention.

FIG. 4 is a longitudinal side view of a conventional weatherstrip body.

FIG. 5 is a longitudinal sectional side view partially showing a manufacturing process of a weatherstrip in a state where three extrusion molding machines of the present invention are used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weather strip main body 2 Vertical support piece 3 Inclined pressure contact piece 5 Intermediate adhesive layer 6 Thin coating layer 7 Drain pressure contact piece 9 Elevating glass window 10 Door panel 11 Door 12 Vehicle 20 First extrusion molding machine 21 Second extrusion molding machine 22 Third extrusion Molding machine 23 Die die 24 Cooling water tank 25 Drawer 26 Standard cutting machine

Claims (3)

[Claims] 1. A weather strip mounted on the inside and outside of a door panel of an elevating glass window in a door of an automobile, wherein the weather strip main body is made of a rigid olefin-based synthetic resin, a polypropylene resin, and a vertical support piece and an inclined support piece are longitudinally formed. A thin intermediate coating layer made of an olefin-based thermoplastic elastomer is laminated on the surface side of the inclined support piece, and the intermediate coating layer has an ethylene (meth) acrylic A weather strip for automobiles, wherein a thin film layer of a synthetic resin comprising a composition such as an acid copolymer or a metal salt thereof is polymerized. 2. The automobile according to claim 1, wherein said molding body is made of a mixed synthetic resin in which powder of mica, talc (talc), glass fiber, etc. is mixed inside said polypropylene resin. For weather strip. 3. A method for forming a weatherstrip mounted on the inside and outside of a door panel of an ascending and descending glass window in an automobile door, wherein a first extruder for molding a molding body includes a hard polypropylene resin or a hard polypropylene resin. A mixed synthetic resin obtained by mixing powders such as mica, talc (talc) and glass fiber is injected, and an olefin-based thermoplastic elastomer is injected into a second extruder as a constituent material for forming an intermediate coating layer. 3 An extruder is used to inject a composition such as an ethylene (meth) acrylic acid copolymer or a metal salt thereof as a constituent material for forming a thin film layer on the surface, and the first extruder and the second extruder are used. And the third extrusion molding machine are operated simultaneously, and the weatherstrip body, the intermediate coating layer and the surface are formed in one mold die. A method for forming a weatherstrip for automobiles, wherein the thin film layer is integrally polymerized.