JPH04203578A - Hose made of epdm and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain an excellent adhesive strength by using a lamination film adapted to be bonded to a rubber base made of EPDM and a metallic member to be joined in order to join the member to be joined, as an electromagnetic shield layer incorporated with a terminal, to the rubber base. CONSTITUTION:EPDM having a heat resistance, a weather resistance and an ozone resistance and used for a rubber base 5 cannot be bonded to a metallic member having an electromagnetic shield ability. Accordingly, a lamination film 7 is used for joining the metallic member 9 to be joined to the rubber base 5. The lamination film 7 is formed of a lamination composed of a first film 11 is made of olefin group resin having a polarity function group and a second film 13 made of thermoplastic resin having a polarity. In a remaining heat condition just after vulcanization of the rubber base 5, the above-mentioned first and second film 11, 13 are laid on the rubber base 5 and the member 9 to be joined, respectively, and are then pressed together, thereby it is possible to obtain an excellent adhesive strength.

Description

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

In the present invention, on the outer surface of a rubber base for a hose made of EPDM,
The present invention relates to an EPDMv hose to which a bonded member serving as an electromagnetic shielding layer with a terminal is bonded, and a method for manufacturing the same.

[Prior art and its problems]

Conventionally, EPDM has been applied to rubber parts used in automobiles, where weather resistance, ozone resistance, heat resistance, etc. have been emphasized.
(Ethylene propylene diene ternary rubber) is used in large numbers. By adhering various members to the rubber base made of this EPDM, research is being carried out to improve the design and functionality. That is, Automobiles, etc. have wiring that connects various electrical systems.As a noise countermeasure for this wiring, it is considered to run the wiring inside a hose with an electromagnetic shielding layer.The material for this hose is heat-resistant. Excellent E
Consideration has been given to using 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, coating with a primer, coating with an adhesive, drying, attaching a member to be bonded, and curing the adhesive. However, conventional adhesive technology requires many of the above-mentioned treatments after vulcanization, resulting in long production lines, low productivity, and increased costs. As a 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 alcohol (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 bonding method is applied to bonding EPDM, there is a problem that high bonding strength cannot be obtained because there is no adhesive that firmly bonds both the EPDM and the adhered member that becomes the electromagnetic shielding layer. Ta. The present invention aims to solve the above-mentioned problems of the conventional technology, and in order to adhere a member to be adhered, which will become an electromagnetic shielding layer with a terminal, to a rubber base for an EPDM hose, a puff treatment or an adhesive is applied. An object of the present invention is to provide a hose made of EPDM that does not require treatment such as coating and has excellent adhesive strength, and a method for manufacturing the same.

[Means to solve the problem]

Among the present inventions made to solve the above problems, the invention of claim 1 includes a rubber base for a hose made of EPDM, a terminal attached to the outer surface of the rubber base, and an electromagnetic shielding layer. An EPDM hose having a bonded member heat-welded to a rubber base through a laminated film, the laminated film being disposed on the rubber base side and having a polar functional group. A first film made of an olefin resin having the following properties and a second film made of a thermoplastic resin having polarity and disposed on the side of the adhered member are laminated. In addition, the invention of claim 2 provides an EPDM hose rubber base body made of EPDM, in which a metallic adhered member serving as an electromagnetic shielding layer is adhered to the outer surface of the rubber base for a hose, and a terminal is further provided on this adhered member. In the method for manufacturing a hose, a rubber base is extruded, the extruded rubber base is vulcanized at a predetermined temperature, and immediately after that, a member to be adhered is thermally welded via a laminated film in a residual heat state, The laminated film includes a first film disposed on the rubber substrate side and made of an olefin resin having a polar functional group, and a second film disposed on the adhered member side and made of a polar thermoplastic resin. It is characterized by using a laminated film of. 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 add such properties include carboxyl groups, hydroxyl groups, amide 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. Further, the member to be adhered is a metallic member having the property of adhering to the second film and having electromagnetic shielding properties, and for example, iron, stainless steel, copper, aluminum foil, etc. 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 metal members that have electromagnetic shielding properties. In order to adhere a metallic member to be adhered to an EPDM rubber substrate having such properties, a laminated film is used in the present invention. 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 has polarity and therefore firmly adheres to the metallic member to be adhered.

【Example】

An embodiment of the present invention will be described below. (1) Adhesive Structure First, in explaining the embodiments, the basic structure of the adhesion 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 auxiliary materials such as a reinforcing filler (carbon black or white filler), a plasticizer, a lubricant, and a vulcanizing agent. Moreover, the material of the first film 11 is an olefin resin having a polar functional group. For example, Atmer (manufactured by Mitsui Petrochemical Industries, Ltd.: product name), Bond First (product name),
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. Further, the member to be adhered 9 is a material having electromagnetic shielding properties and having adhesive properties with the second film 13, for example,
It is possible to use iron, stainless steel, copper, aluminum foil, etc., or a film on the back surface of which aluminum is vapor-deposited or stainless steel is sputtered. Note that this adhered member 9 is equipped with a terminal that serves as its own electromagnetic shield and/or a wiring terminal buried in the rubber base 5 (hose) (insulated from the electromagnetic shield). ing. Next, a method for manufacturing the adhesive structure 1 will be described. The adhesive structure 1 is manufactured by the production line 3 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, wet lamination 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, is a method for producing the first film 11 and the second film 13 from a T-shaped die installed at the tip of an extruder. A wide film is laminated by coextruding each molten resin paulownia material. 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 EPDMU material 21 as the solid rubber of the rubber base 5 and extrusion molding it using an extruder 23. At this time, a heat-resistant coated electric wire (not shown) is simultaneously extruded and buried in the rubber base 5. Next, vulcanization treatment is performed. This step is carried out by passing the extruded rubber substrate 5 through a vulcanization tank 25. The temperature for vulcanization is 18, which is suitable for vulcanizing EPDM.
Perform at 0°C to 240°C. Subsequently, an adhesion process is performed. That is, in this step, the member 9 to be adhered to which the laminated film 7 has been adhered in advance is moved to the roller 27.
This is carried out by winding the rubber base 5 over the rubber substrate 5, and then sequentially letting out the adhered member 9, and pressing the adhered member 9 onto the rubber base 5 using the pressure 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 member to be bonded 9 and another roller 30, and the laminated film 7 and the member to be bonded 9 are simultaneously fed out to form the laminated film. 7 may be interposed between the rubber base 5 and the member to be adhered 9 and bonded. - After going through two series of steps and cooling, the covered wire is connected 12 to the electromagnetic shield and the terminal of the insulated member 9 to be bonded, thereby completing the product. In the above embodiment, in order to adhere the member to be adhered 9 to the rubber base 5 made of EPDM, the first FILNO-11, which is a non-polar resin resin with a polar functional group introduced therein, and the polar second FILNO-11 are used. A laminated film 7 is used in which a film 13 is laminated. That is, in the residual heat state immediately after vulcanization of the rubber substrate, the rubber substrate 5 is placed so that the first film 11 of the laminated film 7 is disposed on the rubber substrate 5 side and the second film 18 is disposed on the adhered member 9 side. A laminated film 7 is interposed between the bonded member 9 and the bonded member 9, and these are pressed together. This allows the first
The fill 1.11 is E P which is an olefin rubber.
[') Due to the compatibility with M, the rubber substrate 5: the adhesive 12 and the second film 13 have polarity a, and therefore are firmly adhered to the member 9 to be adhered. 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 compared to 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) Hose with electromagnetic shielding layer Next, examples of the hose will be described. Figure 3 shows hose 20.
A cross section of 1C is shown. As shown in FIG. 3, the bow 201C includes, in order from the inner circumferential side, a rubber layer 203 serving as an inner tube layer, a reinforcing layer 205 made of thread provided on the outer circumference of this rubber layer 203, and an outer tube layer. A rubber base 207 , and two sets of adhered members 21 .
The rubber layer 203, the reinforcing layer 205, and the rubber base 207 constitute a hose tube 213. Although not shown, the rubber layer 203 and the M strong shoulder 20
A heat-resistant coated electric wire is buried between 5 and 5. Further, as shown in FIG. 4, the hose 201C is provided with a terminal 212 for grounding electrically connected to the adhered member 211C and for connecting the heat-resistant coated electric wire buried inside the hose 201C. It is being Next, Figures 5 and 6 show how to manufacture the hose 201C.
This will be explained according to the diagram. First, the hose tube 213 was extruded. An extruder 221 is also used for extrusion molding. That is, the inner tube extruder 222 extrudes the rubber material for the rubber layer 203 to form the rubber layer 203, and
The yarn 227 was let out by the blade device 225, and the EPDM material was simultaneously extruded by the outer tube extruder 229. At this time, a heat-resistant coated wire (not shown) is coextruded between the rubber layer 203 and the reinforcing layer 205. Note that the rubber used for the rubber layer 203 was chlorofrencom (CR) or nitrile rubber (NBR). Further, the formulation of EPDM used in this example is as follows. Compounding amount (parts by weight) EPDM
Note 1) 100MAF carbon black 130 paraffin process oil 10
0 Zinc white 5 Stearic acid 1 Dehydrating agent (Cab)
5 Vulcanization accelerator
3,5 sulfur 2 Note 1)
rJSREP 57CJ (manufactured by Japan Synthetic Rubber Co., Ltd., trade name) Next, the rubber layer 203 and the rubber base 207 were vulcanized. This step was carried out by passing the hose tube 213 through a steam vulcanizer (or fluidized bed vulcanizer) 231. The vulcanization conditions at this time were 150°C x 3
0 minutes was adopted. Subsequently, an adhesion process was performed. That is, the adhered member 211c to which the laminated film 209 is adhered is moved by the roller 233.
It is fed out through guide rollers 235° and 237, and
Guided to guide ring 239. The guide ring 239 has a tapered cylindrical shape, and by introducing the adhered member 211C, the guide ring 239 is wound around the hose tube 213 by 4=j. After that, the hose pipe body 213
In the residual heat immediately after vulcanization, the bonding member 211C was welded to the surface of the rubber base 207 using the pressure roller 241. At this time, the laminated film 209 uses olefin resin Atomer (trade name, Mitsui Petrochemical Industries, Ltd.) as the first film, and copolymerized polyester resin e-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. Moreover, stainless steel foil was used as the adhered member 211C. Subsequently, the hose 201C was wound up on the winding drum 243. Next, this hose 20IC was left to stand at room temperature for 24 hours and then subjected to a peel test as described below. That is, from the hose 20IC, as shown in Fig. 7, the width is 5 m.
Cut out a test piece 73 of m, and pull the tip of the adhered portion 77 against the rubber base 75 in the direction of the arrow at a speed of 100.
It was pulled under conditions of min in 7 minutes. The peel strength at this time was rupture at the rubber base 75 under a load of 2.5 kg/5 mm. According to the hose with a heat-resistant layer of this embodiment, the above-mentioned
In addition to the effect of
This has the effect of shielding electromagnetic waves generated from internal wiring. Note that the heat-resistant coated electric wire may be embedded in the rubber base 207. In this case, if the laminated film is placed around the heat-resistant coated wire, both the EPDM rubber base 207 and the heat-resistant coated wire will be firmly adhered.

【Effect of the invention】

As explained above, according to the EPDM hose of the present invention, in order to bond a metallic adherend member that becomes an electromagnetic shielding layer with a terminal to an EPDM rubber base, the rubber base and the adherend member are bonded together. Since it uses a laminated film that adheres to each, it has excellent adhesive strength. Further, since the member to be adhered includes a terminal, it can be used as a ground terminal of an electromagnetic shield layer and/or a heat-resistant coated electric wire terminal buried in a hose, which is convenient for wiring from a hose to another member. Furthermore, according to the manufacturing method of the present invention, there is no need for processes such as puffing and applying adhesives, etc., as in conventional techniques, so the production line is shortened and the equipment is simplified. Since the adhesion process is carried out in the residual heat immediately after vulcanization of the rubber base, it not only has excellent productivity but also contributes to energy saving.

[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 a sectional view showing a hose with an electromagnetic shielding layer, Figure 4 is an explanatory diagram of a hose with an electromagnetic shielding layer, Figure 5 is an explanatory diagram showing the production line of the same example, and Figure 6 is the main part of Figure 5. FIG. 7 is an explanatory diagram showing a test state. 1... Adhesive structure 5,207... Rubber base 7.
...Laminated film 9.211C...Glued member 11...First film

Claims (1)

[Scope of Claims] 1. An EPDM hose comprising a rubber base for a hose made of EPDM, and a bonded member that is attached to the outer surface of the rubber base, has a terminal, and serves as an electromagnetic shielding layer, A member to be adhered is thermally welded to a rubber base via a laminated film, and the laminated film includes a first film made of an olefin resin having a polar functional group and disposed on the rubber base side; A hose made of EPDM, characterized in that it uses a laminated film with a second film made of a thermoplastic resin having polarity and disposed on the adhesive member side. 2. A method for manufacturing an EPDM hose, in which a metallic adhered member serving as an electromagnetic shielding layer is adhered to the outer surface of an EPDM rubber base for a hose, and a terminal is further provided on this adhered member, the rubber base being This extruded rubber base is vulcanized at a predetermined temperature, and immediately after that, in the residual heat state, the adhered member is thermally welded via the laminated film, and as the laminated film, the rubber base side A laminated film consisting of a first film made of an olefin resin which is disposed on the substrate and which has a polar functional group, and a second film which is disposed on the side of the adhered member and which is made of a polar thermoplastic resin. A method for manufacturing a hose made of EPDM, characterized in that it is used.