JPH04197843A - Weather strip - Google Patents

Abstract

PURPOSE:To enhance adhesive strength by using a laminated film composed of a specific material and adhesive respectively to a rubber base body and a member to be bonded in order to bond a metallic member to be bonded to the rubber base body made of EPDM. CONSTITUTION:In a weather strip 1 provided with a rubber base body 5 made of EPDM and a metallic decorative bonding member 9 bonded to a surface of the rubber base body 5, the rubber base body 5 and the bonding member 9 are bonded to each other via a laminated film 7. The laminated film 7 is composed of a first film 11 arranged on the side of the rubber base body 5 and a second film 13 arranged on the side of the bonding member 9. For a material of the first film 11 an olefin resin having a polar functional group is adapted while for a material of the second film 13 a thermoplastic resin having a polarity, for example, a copolymerized polyester resin is adapted.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a weather strip in which a metallic decorative member is adhered to the surface of a rubber base made of EPDM.

[Prior art and its problems]

Conventionally, EPDM (
(ethylene propylene diene ternary rubber) are widely used. Research has been conducted to improve the design and functionality of rubber substrates made of EPDM by bonding various members to them. In other words, the car door window frame (center pillar) is equipped with E.
Some weatherstrips have a metal band-shaped decorative member adhered to the surface of a rubber base made of PDM. By the way, as an adhesion method for an EPDM rubber substrate, for example, the following method is known. That is, this is a method in which a rubber substrate that has been extruded and vulcanized is subjected to the following treatments: puffing, degreasing, primer application, adhesive application, drying, attachment of a member to be adhered, and adhesive curing. However, the conventional adhesive technology requires many of the above-mentioned treatments after the vulcanization treatment, resulting in a long production line, low productivity, and increased costs. Furthermore, as other prior art, Japanese Patent Application Laid-Open No. 58-15821
There is one described in Publication No. 6. That is, a solvent-based adhesive such as ethylene vinyl fluoride (EVA), nylon, or polyester is applied in advance to the surface of the member to be adhered. The adhesive side of this member to be adhered is placed on the extruded body immediately after extrusion molding, and pressed with a roller or the like, and the adhesive is melted by the heat of the product itself immediately after extrusion molding. Thereby, the member to be adhered is adhered to the extrusion molded body. However, when this adhesion method is applied to adhesion of EPDM, there is a problem in that high adhesion strength cannot be obtained because there is no adhesive that firmly adheres to both EPDM and metal members. The present invention aims to solve the above-mentioned problems of the conventional technology, and in order to adhere a metallic decorative member to be adhered to an EPDM rubber base, puff treatment, application of adhesive, etc. To provide a weather strip that does not require treatment and has excellent adhesive strength.

[Means to solve the problem]

The present invention, which has been made to solve the above problems, is based on E P
A weatherstrip comprising a DMW rubber base and a metallic decorative adhered member adhered to the surface of the rubber base, which has the adhered member heat-welded to the rubber base via a laminated film. The laminated film includes a first film made of an olefin resin having a polar functional group and disposed on the rubber base side, and a thermoplastic resin having polarity disposed on the adhered member side. It is characterized by using a layered film with a second film. Here, EPDM refers to ethylene-α-olefin-nonconjugated diene copolymer rubber, of which ethylene propylene diene ternary rubber is a typical example. Moreover, a laminated film is a film in which a first film and a second film are laminated. The first film is made by introducing a polar functional group into a non-polar olefin resin. In other words, the first film has adhesion to EPDM as an inherent property of olefin resin, and also has adhesion to resins such as polyethylene and nylon by introducing polar functional groups. It is something. Examples of polar functional groups that impart such properties include carboxyl groups, hydroxyl groups, amine groups, halogen groups, and acrylic groups. Further, the second film is made of a polar resin,
It is a thermoplastic resin that melts when heated. That is, the second film has the property of adhering to both the first film and the metal member. Furthermore, the member to be adhered is a metallic decorative member that has the property of adhering to the second film, such as aluminum, iron, copper, or stainless steel foil, or aluminum vapor-deposited on the back surface, or A metallic resin film made by sputtering stainless steel or the like can be used.

[Effect]

The rubber substrate of the present invention uses EPDM, which has excellent heat resistance, weather resistance, and ozone resistance. EPDM cannot be bonded to metallic members. In the present invention, a laminated film is used in order to adhere a metallic decorative member to be adhered to a rubber base of EPDMM 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 the non-polar olefin resin, it is 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 placed on the side of the rubber base and the second film is placed on the side of the member to be bonded, in a residual heat state immediately after vulcanization of the rubber base. , press these together. As a result, the first film adheres to EPDM, which is an olefin rubber, because it is compatible with the EPDM, and the second film firmly adheres to the member to be adhered because it has polarity.

【Example】

An embodiment of the present invention will be described below. (1) Adhesive Structure First, in explaining the embodiments, the basic structure of the adhesive structure shown in FIG. 2 and its manufacturing method will be explained. In FIG. 2, the bonded structure 1 is constructed by bonding a member 9 to be bonded to a rubber base 5 made of EPDM via a laminated film 7. The laminated film 7 includes a first film 11 disposed on the rubber base 5 side and a second film 13 disposed on the adhered member 9 side. Here, EPDM is produced by adding a small amount of non-conjugated diene such as ethylidenenobornene, dicyclopentadiene, or 1°4-hexadiene as a third component to ethylene or α-olefin (e.g. propylene) and copolymerizing it. A double bond was introduced into the side chain, making it sulfur vulcanizable. This E
PDM usually contains reinforcing fillers (carbon bra, etc.).
Mixed with auxiliary materials such as lacquer or white filler), plasticizers, lubricants, and vulcanizing agents. Further, the material of the T-th film II is an olefin resin having a polar functional group. For example, Atmer (manufactured by Mitsui Petrochemical Co., Ltd.: trade name), Bond First (Sumitomo Chemical Co., Ltd.: trade name), and Modic (Mitsubishi Yuka Co., Ltd.: trade name) can be used. The material of the second film 13 is a copolymerized polyester resin. For example, Chemit R-248 (manufactured by Toshi Co., Ltd.: trade name) can be used. Furthermore, the adhered member 9 is a metallic decorative material that has adhesive properties with the second film 13, such as aluminum, iron, copper, or stainless steel foil, or aluminum vapor-deposited on the back surface, or Alternatively, a metallic resin film made by sputtering stainless steel 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 shown in FIG. 1, but before explaining the continuous process by the production line,
The process of forming the laminated film 7 will be explained. As a method for forming such a laminated film 7, the well-known extrusion lamination method, dry lamination method, sea urchin citralamination method, hot melt lamination method, two-layer inflation method, etc. can be used. Among them, the extrusion lamination method, which is the most suitable method for manufacturing the laminated film 7, involves melting each of the molten resin materials of the first film 11 and the second film 13 from a T-shaped die installed at the tip of an extruder. By coextruding, wide films are laminated and formed. Furthermore, the dry lamination method is a method in which separately formed films are bonded together using an adhesive in a separate process. Next, the molding process shown in FIG. 1 will be explained. First, the rubber base 5 is extruded. The rubber base 5 is manufactured by using an EPDM material 21 as the solid rubber of the rubber base 5 and extrusion molding it using an extruder 23. Next, vulcanization treatment is performed. This step is carried out by passing the extruded rubber substrate 5 through a vulcanization tank 25. The vulcanization temperature is a temperature 1. suitable for vulcanizing EPDM.
This is carried out at a temperature of 80"C to 240°C. Subsequently, an adhesion process is performed. That is, in this process, the member to be adhered 9 to which the laminated film 7 has been adhered in advance is moved to the roller 27.
The adhered member 9 is sequentially rolled out, and at the same time,
This is done by pressing the member to be adhered 9 onto the rubber base 5 using a pressing roller 29. This step is carried out in a residual heat state immediately after the rubber substrate 5 has been vulcanized. As a result, the laminated film 7 is thermally welded, and the adhered member 9 is adhered to the rubber base 5. In addition to this method, as shown by the two-dot chain line, the laminated film 7 is wound around the adhered member 9 and another roller 30,
Pay out the laminated film 7 and the adhered member 9 at the same time,
A method may also be used in which the laminated film 7 is interposed between the rubber base 5 and the member 9 to be adhered. After going through the steps described above and cooling, the product is completed by bending or other processing into a desired shape. In the above embodiment, in order to bond a member 9 to be bonded to a rubber substrate 5 made of EPDM, 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. 13 is used. That is, in the residual heat immediately after vulcanization of the rubber substrate, the first film 11 of the laminated film 7 is attached to the rubber substrate 5.
The laminated film 7 is interposed between the rubber base 5 and the member to be bonded 9 so that the second film 13 is disposed on the member to be bonded 9 side, and these are pressed together. As a result, the first film 11 adheres to the rubber substrate 5 because it is compatible with EPDM, which is an olefin rubber, and the second film 13 firmly adheres to the adhered member 9 because it has polarity. . As a result, the adhered member 9 is firmly adhered to the rubber base 5. According to the embodiments described above, the following effects can be achieved as compared with the conventional technology. (2) The bonding process between the rubber substrate 5, which is in a preheated state immediately after vulcanization, and the adhered member 9 is performed on a series of production lines in a preheated state immediately after vulcanization, so productivity is excellent. ■ The residual heat from vulcanization is used as the energy for thermal welding in the adhesive process, which also contributes to energy savings. ■ Unlike conventional technology, processes such as puffing and applying adhesives are not required, so the production line is shortened.
Equipment is simplified. ■ Uses heat welding, so no adhesive is required.
Therefore, cost reduction can also be achieved. (2) Weatherstrip with metal decorative member Next, examples of the weatherstrip will be described. As shown in FIG. 3, the weather strip 151 is attached to the center pillar of the automobile body 33 between the front door 36F and the seventh rear door 36B. FIG. 4 shows a cross section of the weather strip 151. As shown in FIG. 4, a rubber base 152 made of solid rubber is attached to the attachment member 150 of the center pillar. In addition, a decorative adhesive member 1 is attached to the surface of the rubber base 152 on the outside of the vehicle through a laminated film 153.
55 is glued. Next, a method for manufacturing the weather strip 151 will be explained with reference to FIG. First, extrusion molding was performed. For extrusion molding, an extruder 54 was used to form an extrusion molded body. The extrusion speed at this time was set to 5 m/min. The composition of EPDM used in this example is as follows. Mixture Mixture M (parts by weight) EPDM
Note 1) 100MAF carbon black 130 Paraffin process oil 100
Zinc white 5 stearic acid
1 Dehydrating agent (Cab)
5 Vulcanization accelerator 3.5
Sulfur 2 Note 1) r
JSREP 57CJ8 Honsei-fmu Co., Ltd., trade name Next, vulcanization treatment was performed. This process consists of the extruded body 5
9, a microwave heating device (UHF) mainly for heating
61 and a hot air vulcanizer (HAV) 63 mainly for heat retention.
This was done by passing it through. As the vulcanization conditions at this time, 2oo"c x 5 minutes was adopted. Subsequently, an adhesion treatment was performed. That is, this process was
The adhered member 155 to which the laminated film 153 has been adhered is fed out from the roller 65, and in the residual heat immediately after vulcanization, the adhered member 155 is applied to the surface of the rubber base 152 using the pressure roller 67.
This was done by welding 55. At this time, the laminated film 153 uses olefin resin Atmer (trade name, Mitsui Petrochemical Industries, Ltd.) as the first film, and copolymerized polyester resin Chem) R-248 (trade name) as the second film. (trade name) manufactured by Toshi Co., Ltd.), and these films were laminated to have film thicknesses of 50 μm and 30 μm, respectively. Further, as the member to be adhered 155, a band-shaped member made of iron was used. Subsequently, the formed body after vulcanization is cooled by a cooler 69,
The weather strip 151 shown in FIG. 4 was completed. Next, about this weather strip 151,
After leaving it for 4 hours, a peel test as described below was conducted. That is, as shown in FIG. 6, a test piece 73 with a width of 5 mm is cut out from the weather strip 151, and a test piece 73 is cut out from the rubber base 7.
5, the tip of the adhered member 77 was pulled in the direction of the arrow at a pulling speed of 100 mm/min. The peel strength at this time was determined by applying a load of 2.5 kg and 15 mm to the rubber base 7.
It was destroyed in 5. [Effects of the Invention] As explained above, according to the weather strip of the present invention, in order to adhere a metallic adhered member to an EPDM rubber base, a laminated film that adheres to the rubber base and the adhered member, respectively. It has excellent adhesive strength.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method of manufacturing a bonded structure according to an embodiment of the present invention, FIG. 2 is a sectional view showing the bonded structure, and FIG.
The figure is an explanatory diagram showing the external appearance of the automobile, Fig. 4 is a sectional view showing the weather strip of this example, Fig. 5 is an explanatory diagram showing the production line of the same example, and Fig. 6 is an explanatory diagram showing the test state. It is. ■... Adhesive structure 5,152... Rubber base 7.
1.53... Laminated film 9.155... Member to be adhered 11... First film

Claims (1)

[Scope of Claims] 1. A weather strip comprising a rubber base made of EPDM and a metallic decorative adhesive member adhered to the surface of the rubber base, wherein heat is applied to the rubber base via a laminated film. The laminated film includes a first film made of an olefin resin having a polar functional group and disposed on the rubber base side, and a first film disposed on the side of the bonded member, and A weather strip characterized in that it uses a laminated film including a second film made of a polar thermoplastic resin.