JP2545301B2 - Weather strip and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip in which a non-metallic decorative member to be adhered is bonded to the surface of a rubber base made of EPDM, and a method for manufacturing the weather strip.

[Prior art and its problems]

2. Description of the Related Art Conventionally, as a rubber member used in automobiles, EPDM (ethylene propylene diene ternary rubber) has been widely used in parts where weather resistance, ozone resistance, heat resistance, etc. are important. It has been studied to improve the design and its function by bonding various members to the rubber base made of EPDM. That is, the EPDM is used as a weather strip that is attached to the periphery of a door opening of an automobile, seals a gap between a body and a door, and prevents rainwater, dust, noise, and the like from the outside. Since this EPDM is a black material, a decorative base member made of polyester or nylon cloth that matches the indoor color tone is adhered to the EPDM rubber substrate. By the way, as an adhesion method for a rubber base made of EPDM, for example, the following method is known. That is, it is a method in which a rubber base that has been subjected to extrusion molding and vulcanization is subjected to treatments such as buffing, degreasing, primer coating, adhesive coating, drying, attachment of a member to be adhered, and adhesive curing. However, the conventional bonding technique requires many treatments as described above after the vulcanization treatment, resulting in a long production line, low productivity, and a cost increase. Further, as another conventional technique, there is one described in JP-A-58-158216. That is, a solvent-based adhesive such as ethylene vinyl alcohol (EVA), nylon or polyester is applied to the surface of the adhered member in advance. The adhesive side of this member to be adhered is superposed on the extruded body immediately after extrusion molding, and is pressed by a roller or the like, and the adhesive is melted by the heat of the product itself immediately after extrusion molding. As a result, the adherend member is adhered to the extrusion molded body. However, when this bonding method is applied to the bonding of EPDM, there is a problem that high bonding strength cannot be obtained because there is no adhesive that firmly bonds to both EPDM and polyester. The present invention has an object to solve the problems of the above-mentioned conventional techniques, and in order to adhere a non-metallic decorative adhered member to a rubber base made of EPDM, buffing, application of an adhesive, etc. It is an object of the present invention to provide a weather strip that does not require the above treatment and is excellent in its adhesive strength, and a manufacturing method thereof.

[Means for Solving the Problems]

Among the inventions made to solve the above problems, the invention of claim 1 is a wafer provided with an EPDM rubber substrate and a non-metallic decorative adhered member adhered to the rubber substrate. In the strip, there is provided an adhered member that is heat-welded to a rubber substrate via a laminated film, and the first laminated film is made of an olefin resin having a polar functional group and disposed on the rubber substrate side. A laminate of a film and a second film, which is disposed on the adherend member side and is made of a thermoplastic resin having polarity, is used, and the polar functional group of the first film is a carboxyl group. Characterize. According to a second aspect of the present invention, in a method for producing a weather strip, which comprises adhering a non-metallic decorative adhered member to the surface of an EPDM rubber substrate, the rubber substrate is extruded, and the extruded rubber substrate is extruded. The molded rubber substrate is vulcanized at a predetermined temperature, and the adhered member is heat-welded through the laminated film in a preheated state immediately after the vulcanization. The laminated film is disposed on the rubber substrate side and has a polarity. A first film formed by laminating a first film made of an olefin resin having a functional group and a second film made of a thermoplastic resin having polarity and arranged on the adherend member side is used. The polar functional group of is a carboxyl group. Here, EPDM refers to an ethylene-α-olefin-non-conjugated diene copolymer rubber typified by an ethylene propylene diene ternary rubber. The laminated film is a laminate of the first film and the second film. The first film is obtained by introducing a polar functional group into a nonpolar olefin resin. That is, the first film has adhesiveness to EPDM as an original property of olefin resin, and also has adhesiveness to resins such as polyethylene and nylon by introducing a polar functional group. It is a thing. A polar functional group that imparts such a property is a carboxyl group. The second film is a thermoplastic resin which is made of a polar resin and melts by heating. That is,
The second film has a property of adhering to both the first film and a sheet material such as polyester or a non-metal member such as cloth. Further, the adhered member is a non-metallic member for decoration having a property of adhering to the second film, and includes, for example, polyester, woven fabric such as cloth, polyvinyl chloride (PVC),
A resin sheet material such as nylon or urethane can be used.

[Action]

The rubber substrate of the present invention uses EPDM having excellent heat resistance, weather resistance and ozone resistance. Since EPDM is a non-polar polymer, it can bond to non-polar resins similar to polyethylene and polypropylene, but it cannot bond to polar resins such as polyester and non-metal materials such as cloth. In the present invention, a laminated film is used for adhering a non-metallic adhered member to an EPDM rubber substrate having such properties. The laminated film is obtained by laminating a first film made of an olefin resin having a polar functional group and a second film made of a polar thermoplastic. Since the first film has a polar functional group introduced into a nonpolar olefin resin, it can be easily laminated with the second film which is a polar thermoplastic resin such as polyester. Using such a laminated film, the first film of the laminated film is disposed on the rubber substrate side and the second film is disposed on the adherend member side in a residual heat state immediately after vulcanization of the rubber substrate. , Press them together. As a result, the first film adheres because it is compatible with EPDM, which is an olefinic rubber, and the second film firmly adheres to the adhered member because it has polarity.

【Example】

An embodiment of the present invention will be described below. (1) Adhesive Structure First, in describing an embodiment, an adhesive structure shown in FIG. 2 which is a basic configuration and a method for manufacturing the same will be described. In FIG. 2, the adhesive structure 1 is constituted by adhering a member 9 to be adhered to a rubber substrate 5 made of EPDM via a laminated film 7. The laminated film 7 is composed of a first film 11 arranged on the rubber base 5 side and a second film 13 arranged on the adhered member 9 side. Here, EPDM is obtained by adding a small amount of a non-conjugated diene such as ethylidenenobornene, dicyclopentadiene, and 1,4-hexadiene as a third component to ethylene and α-olefin (for example, propylene) and copolymerizing them. A double bond is introduced into the chain to enable sulfur vulcanization. The EPDM is usually blended with auxiliary materials such as a reinforcing filler (carbon black or white filler), a plasticizer, a lubricant, a vulcanizing agent and the like. The material of the first film 11 is an olefin resin having a polar functional group. For example, Admer (manufactured by Mitsui Petrochemical Co., Ltd .: trade name), Bond First (Sumitomo Chemical Co., Ltd .: trade name), and Modic (Mitsubishi Petrochemical Co., Ltd .: trade name) can be used. The material of the second film 13 is a copolyester resin. For example, Chemit R-248 (manufactured by Toray Industries, Inc .:
Trade name) can be used. As the material for the second film, nylon (N (PA)), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), ethylene vinyl alcohol copolymer, ionomer (IONOMAER), Etc. can be used. Further, the adhered member 9 is a decorative material having adhesiveness to the second film 13, and, for example, a cloth such as polyester or a resin sheet material such as PVC can be used. Next, a method for manufacturing the adhesive structure 1 will be described. The adhesive structure 1 is manufactured by the production line of FIG. 1. Before describing the continuous process by the production line, the process of forming the laminated film 7 will be described. As a method of forming such a laminated film 7,
Well-known extrusion lamination method, dry lamination method, wet lamination method, hot melt lamination method, two-layer inflation method and the like can be used. Among them, the extrusion lamination method, which is the most preferable method for producing the laminated film 7, uses the T-shaped die provided at the tip of the extruder to remove each molten resin material of the first film 11 and the second film 13. By co-extruding, a wide film is laminated and formed. In addition, the dry lamination method is a method in which separately molded films are bonded with an adhesive in a separate step. Next, the molding process shown in FIG. 1 will be described. First, the rubber substrate 5 is extruded. EPDM material 21 is used as the solid rubber of the rubber substrate 5, and this is extruded by the extruder 23.
The rubber substrate 5 is manufactured by extrusion molding. Next, a vulcanization process is performed. This step is performed by passing the extruded rubber substrate 5 through the vulcanization tank 25. As the vulcanization temperature, a suitable temperature for vulcanizing EPDM is 180 ° C to 2 ° C.
Perform at 40 ° C. Then, a bonding process is performed. That is, this step is
The adhered member 9 to which the laminated film 7 is adhered in advance is attached to the roller 27
Wrap it around, and sequentially feed out the adherend member 9,
This is performed by pressing the member 9 to be adhered onto the rubber substrate 5 with the pressure roller 29. This step is performed in a residual heat state immediately after the rubber base 5 is vulcanized. As a result, the laminated film 7 is heat-sealed, and the adherend member 9 is adhered to the rubber substrate 5. In addition to this method, as shown by the chain double-dashed line, the laminated film 7 is wrapped around a roller 30 different from the member 9 to be adhered,
The laminated film 7 and the adherend member 9 are simultaneously drawn out,
A method of interposing the laminated film 7 between the rubber substrate 5 and the member 9 to be adhered may be used. After cooling through the steps described above, the product is completed by processing such as bending into a desired shape. In the above example, in order to adhere the adherend member 9 to the EPDM rubber substrate 5, a first film 11 in which a polar functional group is introduced into a non-polar olefin resin and a second film having polarity are used. The laminated film 7 in which 13 and 13 are laminated is used. That is, in the preheated state of the rubber base immediately after vulcanization, the first base film 11 and the second base film 13 of the laminated film 7 are arranged on the rubber base 5 side and the adhered member 9 side, respectively. The laminated film 7 is interposed between and the member 9 to be adhered, and these are pressed against each other. As a result, the first film 11
Adheres to the rubber base 5 because it is compatible with EPDM, which is an olefinic rubber, and the second film 13 has a polarity and therefore adheres strongly to the adherend member 9. As a result, the adherend member 9 is firmly adhered to the rubber substrate 5. According to the above-described embodiment, the effects described below can be obtained as compared with the conventional technique. Since the adhesion treatment between the rubber substrate 5 in the preheated state immediately after vulcanization and the member to be bonded 9 is performed on a series of production lines in the preheated state immediately after vulcanization, the productivity is excellent. Since the residual heat during vulcanization is used as the energy for heat welding in the adhesive treatment, it also contributes to energy saving. Unlike the conventional technology, it does not require steps such as buffing and coating with adhesive, etc., which shortens the production line,
Equipment is simplified. Since heat welding is used, no adhesive is needed,
Therefore, cost reduction can be realized. (2) Weather Strip Next, an embodiment applied to a weather strip door opening trim (hereinafter referred to as a weather strip) will be described. As shown in FIG. 3, the weather strip 31 is
It is attached to the periphery of the door opening 35 of the automobile body 33. FIG. 4 shows a cross section of the weather strip 31. As shown in FIG. 4, a rubber base made of solid rubber with a U-shaped cross section is provided on the flange (not shown) of the door opening.
37 is attached by lip 39 in a pressed state. A plate-shaped insert member 41 is embedded in the rubber base 37. Further, a decorative adhered member 43 is adhered to the surface of the rubber base 37 on the side facing the vehicle interior via a laminated film 42. A hollow seal portion 45 made of sponge rubber for sealing is integrally formed on a side portion of the rubber base 37. Next, a method of manufacturing a weather strip will be described with reference to FIG. First, extrusion molding was performed. A cross-head type extruder 51 was used for the extrusion molding. That is, so-called co-extrusion was performed in which the EPDM material filled in the cylinders 53 and 55, the sponge rubber material, and the core material 57 serving as an insert member were simultaneously extruded. As a result, the extrusion molded body 59 shown in FIG. 6 was extrusion molded. The extrusion speed at this time was set to 5 m / min. The EPDM composition used in this example is as follows. Compounding amount (parts by weight) EPDM Note 1) 100 MAF carbon black 130 Paraffinic process oil 100 Zinc white 5 Stearic acid 1 Dehydrating agent (CaO) 5 Vulcanization accelerator 3.5 Sulfur 2 Note 1) “JSREP 57C” Japan Synthetic Rubber Co., Ltd., trade name Further, as the sponge rubber of the hollow seal portion 45, EPDM with a foaming agent added was used. In addition, insert members
As the core material of 41, a plate material made of iron was used. Next, vulcanization treatment was performed. This step is
59, microwave heating device (UHF) for heating 61
And a hot air vulcanizing device (HAV) 63 for keeping heat. The vulcanization conditions at this time are 200
℃ × 5 minutes was adopted. Then, an adhesive treatment was performed. That is, in this step, the adhered member 43 to which the laminated film 42 is adhered is
It was carried out by feeding out the adhered member 43 to the surface of the rubber base 37 by the pressure bonding roller 67 in the preheated state immediately after vulcanization and in the residual heat state immediately after vulcanization. At this time, in the laminated film 42, an olefin resin Admer (trade name of Mitsui Petrochemical Industry Co., Ltd.) was used as the first film, and a copolyester resin Chemit R-248 (Toray Co., Ltd.) was used as the second film. Manufactured by K.K .: product name) and the film thickness of each is 50
It is formed by stacking so as to have a thickness of 30 μm and 30 μm. Further, as the adhered member 43, a woven fabric made of polyester was used. Subsequently, the formed body after vulcanization was cooled by the cooler 69, and was further bent by the processing machine 71 into a U-shaped cross section, whereby the weather strip 31 shown in FIG. 4 was completed. Next, this weather strip 31 was left at room temperature for 24 hours, and then subjected to a peeling test described below. That is, as shown in FIG. 7, a test piece 73 having a width of 5 mm is cut out from the weather strip 31, and the tip of the adhered member 77 is pulled in the arrow direction with respect to the rubber base 75;
I pulled it for a minute. The peel strength at this time is 2.5 kg /
With a load of 5 mm, the rubber substrate 75 was destroyed.

【The invention's effect】

As described above, according to the weather strip of the present invention, since the laminated film for adhering to the rubber base and the adhered member is used to adhere the adhered member to the EPDM rubber base, Excellent strength. Further, according to the manufacturing method of the present invention, unlike the prior art, steps such as buffing and coating with an adhesive or the like are unnecessary, so that the production line is shortened and the equipment is simplified. Furthermore, since the adhesion treatment is performed in the residual heat state immediately after vulcanization of the rubber substrate, it is excellent in productivity and contributes to energy saving.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for manufacturing an adhesive structure according to an embodiment of the present invention, FIG. 2 is a sectional view showing the adhesive structure, and FIG.
FIG. 4 is an explanatory view showing the appearance of an automobile, FIG. 4 is a sectional view showing a weather strip of this embodiment, FIG. 5 is an explanatory view showing a production line of the same embodiment, and FIG. 6 is extrusion of the same embodiment. Sectional drawing which shows a molded object, FIG. 7 is explanatory drawing which shows a test state. 1 ... Adhesive structure, 5,37,75 ... Rubber base 7,42 ... Laminated film 9,43 ... Adhered member 11 ... First film 13 ... Second film, 23,51 ... … Extruder 25 …… Vulcanization tank, 31 …… Weather strip

Claims (2)

(57) [Claims] 1. A weather strip comprising a rubber base made of EPDM and a non-metallic decorative adhered member adhered to the rubber base, which is heat-welded to the rubber base via a laminated film. A laminated film having a member to be adhered, which is disposed on the rubber substrate side and is made of an olefin resin having a polar functional group, and a film which is disposed on the member to be adhered and has polarity. A weather strip, wherein a laminate of a second film made of a thermoplastic resin is used, and the polar functional group of the first film is a carboxyl group. 2. A method for producing a weather strip comprising a non-metallic decorative adhered member bonded to the surface of a rubber base made of EPDM, wherein a rubber base is extruded, and the extruded rubber base is extruded. Is vulcanized at a predetermined temperature, and a member to be adhered is heat-welded via a laminated film in a residual heat state immediately after that, and the laminated film is disposed on the rubber substrate side and has a polar functional group. A laminate of a first film made of an olefin resin and a second film made of a thermoplastic resin having a polarity and arranged on the adherend member side is used, and the polar function of the first film is used. The group is a carboxyl group, which is a method for producing a weatherstrip.