JP2017183198A - Manufacturing method of fuel cell seal body, and rubber gasket for fuel cell used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of fuel cell seal body capable of manufacturing a fuel cell seal body having no risk of contamination by burrs, and deterioration of setting resistance of rubber gasket, and bonding integration of the rubber gasket and a metal member is made well, and to provide a rubber gasket for fuel cell for use therein.SOLUTION: A manufacturing method of fuel cell seal body includes a step of coating a part of the surface of a rubber gasket for fuel cell composed of a peroxide crosslinked rubber with primer, a step of adhering the primer coated surface of in the rubber gasket for fuel cell to a metal member for fuel cell, a step of fixing the rubber gasket for fuel cell to the adhesion surface of the rubber gasket for fuel cell and metal member for fuel cell, while crimping so that the compression ratio becomes 5-70%, and a step of bonding the rubber gasket for fuel cell and metal member for fuel cell, by heating at 50-120°C for 24 hours, in the crimped and fixed state.SELECTED DRAWING: None

Description

  The present invention relates to a method of manufacturing a fuel cell seal body in which a fuel cell rubber gasket and a fuel cell metal member are bonded and integrated, and a fuel cell rubber gasket used therefor.

  The fuel cell generates electricity by the electrochemical reaction of gas, has high power generation efficiency, cleans the discharged gas, and has very little influence on the environment. Among these, the polymer electrolyte fuel cell can be operated at a relatively low temperature and has a large power density. For this reason, various uses, such as a power generation and an automotive power source, are expected.

  In a polymer electrolyte fuel cell, a cell in which a membrane electrode assembly (MEA) or the like is sandwiched between separators is a power generation unit. The MEA includes a polymer membrane (electrolyte membrane) serving as an electrolyte, a pair of electrode catalyst layers (a fuel electrode (anode) catalyst layer, an oxygen electrode (cathode) catalyst layer) disposed on both sides in the thickness direction of the electrolyte membrane, Consists of. On the surface of the pair of electrode catalyst layers, a porous layer for further diffusing gas is disposed. A fuel gas such as hydrogen is supplied to the fuel electrode side, and an oxidant gas such as oxygen or air is supplied to the oxygen electrode side. Power generation is performed by an electrochemical reaction at the three-phase interface between the supplied gas, the electrolyte, and the electrode catalyst layer. The polymer electrolyte fuel cell is configured by fastening a cell laminate in which a large number of the cells are laminated with end plates or the like arranged at both ends in the cell lamination direction.

The separator is formed with a flow path of gas supplied to each electrode and a flow path of refrigerant for relaxing heat generation during power generation. For example, when the gas supplied to each electrode is mixed, problems such as a decrease in power generation efficiency occur. The electrolyte membrane has proton conductivity in a state containing water. For this reason, it is necessary to keep the electrolyte membrane in a wet state during operation. Therefore, in order to prevent gas mixing, gas and refrigerant leakage, and to keep the inside of the cell moist, it is important to ensure the sealing performance around the MEA and the porous layer and between adjacent separators. It becomes. As a sealing member for sealing these constituent members, for example, an ethylene-propylene-diene terpolymer rubber (EPDM), an ethylene-propylene copolymer rubber (EPM), or the like is used. Seal members (rubber gaskets) have been proposed (see Patent Documents 1 and 2).
The reason why the peroxide cross-linked rubber is used as described above is that, in the sulfur cross-linked rubber, there is a possibility that the power generation of the fuel cell may be hindered by sulfur as a cross-linking component.

JP 2009-94056 A JP 2014-65248 A

  The rubber gasket includes an adhesive type and a non-adhesive type. The rubber gaskets shown in Patent Documents 1 and 2 above are adhesive types that contain an adhesive component in the material. The unvulcanized rubber is placed between the constituent members to be adhesively sealed and crosslinked. Sulfur bonding is performed. However, when such vulcanization adhesion is performed, burrs due to the rubber gasket material are likely to occur, and there is a problem that constituent members such as separators are contaminated by the burrs.

  Therefore, it has been studied to perform post-adhesion such that a non-adhesive type rubber gasket is adhered by application of a thermosetting adhesive so as not to generate burrs as described above. However, the high heat at the time of thermosetting the adhesive may deteriorate the sag resistance of the rubber gasket.

  The present invention has been made in view of such circumstances, and there is no risk of contamination due to burrs or deterioration of the sag resistance of the rubber gasket, and the fuel cell in which the rubber gasket and the metal member are well bonded and integrated. It is an object of the present invention to provide a method for producing a fuel cell seal body that can produce a seal body, and a rubber gasket for a fuel cell used therein.

  In order to achieve the above object, the present invention comprises a step of applying a primer to a part of the surface of a rubber gasket for a fuel cell made of peroxide-crosslinked rubber, and a primer-coated surface of the rubber gasket for a fuel cell as a fuel. The fuel cell rubber gasket is pressure-bonded to the contact surface between the fuel cell rubber gasket and the fuel cell metal member so that the compression ratio is 5 to 70%. And a step of heating at 50 to 120 ° C. for 24 hours or more and bonding the fuel cell rubber gasket to the fuel cell metal member in the state of being crimped and fixed. A fuel cell sealing body manufacturing method characterized by the above is a first gist.

  In addition, the present invention provides a rubber gasket for a fuel cell, characterized in that a primer layer is formed on a part of the surface of a rubber gasket for a fuel cell made of peroxide-crosslinked rubber. To do.

  That is, the present inventors have intensively studied to solve the above problems. In the course of that research, we recalled the use of a primer such as a silane coupling agent for the adhesion between a fuel cell rubber gasket made of peroxide-crosslinked rubber and a fuel cell metal member. Conventionally, it has been difficult to bond a rubber gasket and a metal member with only the primer as described above. However, when a primer is applied to the rubber gasket side, the application surface is adhered to the metal member, and the rubber gasket is fixed and pressure-bonded to the adhesion surface while being compressed at a compression rate of 5 to 70% for 24 hours or more. It has been found that good adhesion can be achieved at a temperature of 50 to 120 ° C. even if adhesion is not performed at such a high temperature that the sag resistance is affected. Since good adhesion is achieved even at high temperatures, it is possible to eliminate the problem of deterioration of the rubber gasket sag resistance due to high temperatures, and as a result, it was found that the intended purpose can be achieved. The invention has been reached.

  The method for producing a fuel cell seal body according to the present invention includes a step of applying a primer to a part of a surface of a rubber gasket for a fuel cell made of a peroxide-crosslinked rubber, and a primer application surface of the rubber gasket for a fuel cell. The fuel cell rubber gasket is pressure-bonded to the contact surface between the fuel cell rubber gasket and the fuel cell metal member so that the compression ratio is 5 to 70%. A step of fixing, and a step of heating at 50 to 120 ° C. for 24 hours or more in a state where the above-described pressure-fixing is performed, thereby bonding the fuel cell rubber gasket to the fuel cell metal member. Therefore, there is no fear of contamination due to burrs or deterioration of the sag resistance of the rubber gasket, and a fuel cell seal body in which the rubber gasket and the metal member are well bonded and integrated can be manufactured.

  In particular, after the step of applying a primer to a part of the surface of the fuel cell rubber gasket, a step of partially applying an adhesive to the primer application surface of the fuel cell rubber gasket to form an adhesive layer. When the primer application surface on which the pressure-sensitive adhesive layer is partially formed is brought into close contact with the metal member for a fuel cell, the initial adhesiveness between the rubber gasket and the metal member can be improved.

  When at least one selected from the group consisting of a silane coupling agent primer, a cyanoacrylate adhesive, an epoxy adhesive, a urethane adhesive, and a modified olefin adhesive is used as the primer, a rubber Adhesive integration of the gasket and the metal member can be satisfactorily performed.

  In addition, when at least one selected from the group consisting of an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive is used as the pressure-sensitive adhesive, the initial stage of the rubber gasket and the metal member is used. Adhesion can be improved.

  The fuel cell rubber gasket of the present invention in which a primer layer is formed on a part of the surface of a fuel cell rubber gasket made of peroxide-crosslinked rubber can be mass-produced in advance and prepared. By applying the method for producing the fuel cell seal body of the present invention as described above, the primer coating step can be omitted at the production site.

  Further, when the rubber gasket for a fuel cell is such that a pressure-sensitive adhesive layer is partially formed on the primer layer, the initial adhesiveness is excellent.

It is sectional drawing which shows an example of a fuel cell seal body. It is sectional drawing which shows an example using the rubber gasket for fuel cells.

  Next, embodiments of the present invention will be described in detail. However, the present invention is not limited to this embodiment.

  As described above, the method for producing a fuel cell seal body of the present invention is a surface of a rubber gasket for a fuel cell (hereinafter sometimes simply referred to as “rubber gasket”) made of peroxide-crosslinked rubber. A step of applying a primer to the part (first step), and a step of bringing the primer-coated surface of the fuel cell rubber gasket into close contact with a metal member for fuel cell (hereinafter sometimes simply referred to as “metal member”) ( The fuel cell rubber gasket is fixed to the contact surface between the fuel cell rubber gasket and the fuel cell metal member while being compressed so that the compression ratio is 5 to 70%. A step (third step) and a step of heating the rubber gasket for fuel cell and the metal member for fuel cell (heating step) by heating at 50 to 120 ° C. for 24 hours or more in the above-mentioned pressure-bonded state (first step) And a step) and. Therefore, there is no fear of contamination due to burrs or deterioration of the sag resistance of the rubber gasket, and a fuel cell seal body in which the rubber gasket and the metal member are well bonded and integrated can be manufactured.

Here, an example of the fuel cell seal body is shown in FIG. FIG. 1 mainly shows a single cell 1 in a fuel cell in which a plurality of cells are stacked. The cell 1 includes an MEA 2, a gas diffusion layer (GDL) 3, a rubber gasket 4a, A separator 5 and a primer layer 6 are provided. The manufacturing method of the present invention is characterized by the bonding method when the separator 5 which is a metal member and the rubber gasket 4a are bonded via the primer layer 6.
Further, FIG. 2 shows a rectangular thin plate shape, in which a total of six grooves extending in the longitudinal direction are recessed, and the separator 5 exhibiting the above-described cross-sectional uneven shape is rectangularly interposed via the primer layer 6. This is a member provided with a rubber gasket 4b having a convex shape in cross section. And in the manufacturing method of this invention, it has the characteristics in the adhesion | attachment method at the time of adhering the separator 5 which is a metal member, and the rubber gasket 4b through the primer layer 6. FIG.
A rubber gasket 4b having a shape as shown in FIG. 2 can be adhered to the separator 5 of the cell 1 shown in FIG. 1 via a primer layer 6 as a retrofit, and a plurality of such cells 1 are arranged. The fuel cell seal body may be configured by laminating the sheets. 2 may be used instead of the separator 5 shown in FIG. 1 to form a cell 1 using a member in which the separator 5 and the rubber gasket 4b are bonded via the primer layer 6 as shown in FIG.

  The rubber gaskets 4a and 4b are made of ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), natural rubber, acrylonitrile-butadiene rubber (NBR), fluorine rubber (FKM), silicone rubber (Q), etc. It is obtained by crosslinking a peroxide-crosslinked rubber composition, which is a polymer and has an organic peroxide crosslinking agent, by press molding or the like. The rubber composition may contain various additives such as a softening agent, a crosslinking aid, a reinforcing agent, a plasticizer, an anti-aging agent, a tackifier, and a processing aid as necessary. . Further, the hardness (JIS-A) of the rubber gaskets 4a and 4b obtained as described above is usually in the range of 10 to 90 °, and preferably in the range of 40 to 70 °.

The rubber gasket 4a in FIG. 1 has a rectangular frame shape, and is bonded to the peripheral portion of the MEA 2 and the gas diffusion layer 3 and the separator 5, and seals the peripheral portion of the MEA 2 and the gas diffusion layer 3. . In FIG. 1, the rubber gasket 4 a uses two members that are divided into upper and lower parts, but a single rubber gasket that combines them may be used.
Further, the rubber gasket 4 b in FIG. 2 has a rectangular shape and a cross-sectional convex shape, and is bonded onto the separator 5 via the primer layer 6. And the said rubber gasket 4b bears the role which seals between the cells 1 in lamination | stacking of the several cell 1. FIG.

Although not shown, the MEA 2 shown in FIG. 1 includes a pair of electrodes disposed on both sides in the stacking direction with the electrolyte membrane interposed therebetween. The electrolyte membrane and the pair of electrodes have a rectangular thin plate shape. Gas diffusion layers 3 are disposed on both sides in the stacking direction with the MEA 2 interposed therebetween. The gas diffusion layer 3 is a porous layer and has a rectangular thin plate shape.
The separator 5 shown in FIGS. 1 and 2 is preferably made of a metal such as titanium. From the viewpoint of conduction reliability, a metal separator having a carbon thin film such as a DLC film (diamond-like carbon film) or a graphite film is used. Particularly preferred. The separator 5 has a rectangular thin plate shape and is provided with a total of six grooves extending in the longitudinal direction. The cross section of the separator 5 has an uneven shape due to the grooves. The separators 5 are opposed to each other on both sides of the gas diffusion layer 3 in the stacking direction. A gas flow path 7 for supplying gas to the electrode is defined between the gas diffusion layer 3 and the separator 5 by using an uneven shape. When a fuel cell such as a solid polymer fuel cell is operated, fuel gas and oxidant gas are supplied through the gas flow paths 7 respectively.

  Next, the manufacturing method of the fuel cell seal body of the present invention will be described step by step. First, in the first step, as a primer applied to a part of the rubber gasket surface (a material for forming the primer layer 6 in FIGS. 1 and 2), a silane coupling agent primer, a cyanoacrylate adhesive, Epoxy adhesives, urethane adhesives, modified olefin (such as maleic anhydride) adhesives and the like are used alone or in combination of two or more. Among these, a silane coupling agent-based primer is preferably used from the viewpoint of better adhesion and integration between the rubber gasket and the metal member. The main component of the silane coupling agent primer is a silane coupling agent, and a vinyl silane coupling agent, an amino silane coupling agent, an acrylic silane coupling agent, a methacrylic silane coupling, or the like is used. However, among them, a vinyl silane coupling agent that is excellent in the reactivity of the rubber gasket with the rubber is particularly preferably used.

In addition, the thickness of the primer layer formed by apply | coating and drying the said primer is 0.001-1 micrometer normally, Preferably it is 0.01-0.3 micrometer.
In the first step, the adhesive strength is increased by applying a primer to the rubber gasket side. Moreover, adhesive strength becomes higher by apply | coating a primer to both the base material side and the metal member side. Further, in order to increase the adhesive strength, surface treatment such as plasma treatment, excimer treatment, itro treatment, corona treatment, etc. may be performed on the metal member side, the rubber gasket side, or both.

  In addition, after the said 1st process, you may apply | coat an adhesive partially to the primer application surface in a rubber gasket, and may form an adhesive layer as needed. When the pressure-sensitive adhesive layer is formed in this way, the initial adhesiveness between the rubber gasket and the metal member can be improved. That is, since the adhesive force of the primer takes a certain time to develop, it is preferable to form the pressure-sensitive adhesive layer as described above for the purpose of enhancing the sealing performance until the primer is developed. In addition, since only the pressure-sensitive adhesive layer decreases the adhesive strength with time, long-term sealing properties cannot be obtained. In addition, it is preferable to form the pressure-sensitive adhesive layer in 3 to 80%, preferably 10 to 70%, more preferably 15 to 60% of the primer application area from the viewpoint of improving the initial and long-term adhesiveness.

  As the pressure-sensitive adhesive that is the material of the pressure-sensitive adhesive layer, an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, and a rubber-based pressure sensitive adhesive such as natural rubber are used alone or in combination. . That is, these pressure-sensitive adhesives can further improve the initial adhesiveness between the rubber gasket and the metal member.

  In addition, the thickness of the adhesive layer formed by apply | coating the said adhesive and making it dry is 0.5-50 micrometers normally, Preferably it is 1-20 micrometers.

  Here, the rubber gasket in which the primer layer is formed as described above and the rubber gasket in which the pressure-sensitive adhesive layer is partially formed on the primer layer can be mass-produced and prepared in advance. If mass production is prepared in advance in this way, a primer application step (first step) is performed at the manufacturing site by using this when performing the method of manufacturing a fuel cell seal body of the present invention. Can be omitted.

  Next, in the second step, the primer application surface of the rubber gasket is adhered to the metal member. As described above, since the primer application surface needs to be in close contact with the metal member, when forming the pressure-sensitive adhesive layer, instead of forming the pressure-sensitive adhesive layer on the entire primer application surface, partially (primer application area) It is necessary to form a pressure-sensitive adhesive layer.

  In the third step, the rubber gasket is pressure-bonded and fixed to the contact surface between the rubber gasket and the metal member so that the compression ratio is 5 to 70%. The compression ratio is preferably in the range of 10 to 50%. That is, if the compression ratio is too low, desired adhesiveness cannot be obtained, and conversely, if the compression ratio is too high, rubber breakage occurs due to the compression. The compression ratio indicates the ratio of the thickness of the rubber gasket compressed relative to the thickness (100%) of the rubber gasket in an uncompressed state. Therefore, the compression ratio is determined by the size of the rubber gasket in an uncompressed state and the size of the rubber gasket in a compressed state set by a fixing jig or a mold. The area of the pressure-sensitive adhesive layer after the third step is 5 to 90%, preferably 15 to 75%, more preferably 20 to 65% with respect to the primer application area.

  In the fourth step, the rubber gasket and the metal member are bonded to each other by heating at 50 to 120 ° C. for 24 hours or longer in the above-described pressure-bonded state. In the said process, Preferably, the heating for 24 to 100 hours is performed at 60-110 degreeC. Thus, since it is very low temperature, there is also no possibility of deteriorating the sag resistance of the rubber gasket. In addition, when the said temperature is too low, desired adhesiveness cannot be obtained.

  In the fuel cell seal body of the present invention obtained through such steps, the rubber gasket and the metal member are well bonded and integrated. Moreover, since the said adhesion | attachment is post-adhesion, there is no contamination by a burr | flash, Furthermore, since it is not exposed to the high heat at the time of adhesion | attachment, the sag-resistance of a rubber gasket is also favorable. The fuel cell seal body of the present invention eliminates the problem of seal leakage because it is less likely to cause misalignment and sag of the rubber gasket over time than when a non-adhesive rubber gasket is installed. can do.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to these examples as long as the gist thereof is not exceeded.

[Examples 1 to 10, Comparative Examples 1 to 5]
≪Preparation of rubber gasket sample≫
100 parts by weight of EPDM (manufactured by Sumitomo Chemical Co., Ltd., Esprene 505), 6 parts by weight of organic peroxide (manufactured by NOF Corporation, Perhexa 25B-40), and paraffinic process oil as a softening agent (manufactured by Idemitsu Kosan Co., Ltd., Diana) A rubber composition was prepared by kneading 20 parts by weight of process oil PW380) and 50 parts by weight of carbon black (manufactured by Tokai Carbon Co., Ltd., Seast S) using a Banbury mixer and an open roll.
And the said rubber composition was bridge | crosslinked by hold | maintaining at 180 degreeC for 10 minute (s), the rubber piece obtained by it was cut out, and the rubber gasket sample (thickness 1mm, magnitude | size 5mm x 30mm) was produced.

≪Adhesion between rubber gasket sample and metal member≫
First, a primer (Chemok C607, manufactured by Lord Corporation) was applied to the entire surface of the rubber gasket sample, and dried at room temperature for 10 minutes to form a primer layer having a thickness of 0.05 μm (except for Comparative Example 5). In Examples 6 to 10, a pressure-sensitive adhesive (pressure-sensitive adhesive in which BBX909 manufactured by Cemedine Co., Ltd. was dissolved in ethyl acetate to a solid content of 70%) was applied onto the resin film and dried at 100 ° C. for 10 minutes. The sheet was transferred to the primer forming surface of the gasket sample to form an adhesive layer having a thickness of 20 μm. The pressure-sensitive adhesive layer was 50% of the primer application area. In Comparative Example 5, the pressure-sensitive adhesive layer (20 μm) was formed on the entire surface of the rubber gasket sample without forming the primer layer.
And after sticking the titanium base material (TR270C, thickness 0.1mm) cut | disconnected to 30 mm x 50 mm with respect to one surface of the rubber gasket sample in which the primer layer or the adhesive layer was formed in this way, the said rubber gasket The sample was fastened using a SUS jig so that the compression ratio of the sample became a predetermined value. And this fastening thing was heat-processed by predetermined temperature conditions for 24 hours with the hot stove. Thereafter, the fastening was immediately released to obtain a target adhesive body (a rubber gasket sample bonded and integrated on a titanium base material).
The compression ratio and heat treatment temperature were set to the values shown in Tables 1 and 2 below.

  With respect to the adhesive bodies of Examples and Comparative Examples thus obtained, each characteristic was evaluated according to the following criteria. The results are shown in Tables 1 and 2 below.

<Peeling force>
After producing the above-mentioned adhesive, it was left for a predetermined time in an environment of 23 ° C. Here, “Initial” shown in the table below is that which has been left for 2 hours, “After 100 hours” is that which has been left for 100 hours, and “After 500 hours” is what has been left for 500 hours. is there. After leaving the above, the rubber gasket sample on the titanium base material was peeled off using a desktop tensile tester, and the one requiring a peeling force of 0.2 N / mm or more was evaluated as ○, and less than 0.2 N / mm What peeled with the peeling force of was evaluated as x.

<Heatiness>
After producing the above-mentioned bonded body, it was left in an environment at 23 ° C. for 500 hours. And the thickness (final thickness of a sample) of the rubber gasket sample in the said adhesive body was measured with the laser sensor, and the compression set rate was computed by the following formula.
Compression set rate (%) = {(initial thickness of sample−final thickness of sample) / (initial thickness of sample−thickness when fastening sample)} × 100
And in the following table | surface, the case where the said compression set rate was 25% or less was evaluated as (circle), and the case where a compression set rate was larger than 25% was evaluated as x.

From the results of the above table, in the examples, the adhesive strength is high because heating is performed at 50 to 120 ° C. for 24 hours while being compressed so that the compression rate becomes 5 to 70%. It can be seen that it is difficult to peel off (the peel strength evaluation is high). In particular, in Examples 6 to 10, since the pressure-sensitive adhesive layer was formed, the “initial” peel strength evaluation was also high.
Moreover, in all of the examples, since the heating was performed at a low temperature of 50 to 120 ° C., the evaluation of sagability was good.

  On the other hand, in Comparative Example 1, the heat treatment temperature at the time of bonding was somewhat low, and the desired adhesiveness could not be obtained. In Comparative Example 2, the heat treatment temperature at the time of bonding was slightly high and desired adhesiveness could be obtained, but the heat treatment temperature was affected and the evaluation of sagability was poor. In Comparative Example 3, the compression rate at the time of bonding was too low, and the desired adhesion could not be obtained. In Comparative Example 3, since the adhesiveness was not obtained even after being left for 500 hours, the sag evaluation was not performed. In Comparative Example 4, the compression rate at the time of bonding was too high, and rubber breakage occurred at the time of producing the bonded sample, so that evaluation could not be performed. In Comparative Example 5, the “initial” adhesiveness was obtained by the pressure-sensitive adhesive layer, but the desired adhesiveness was not obtained after being left for 100 hours, and the adhesiveness was not obtained similarly after being left for 500 hours. No sagging evaluation was performed.

  The method for producing a fuel cell seal body of the present invention can achieve good adhesion and integration between a fuel cell metal member such as a metal separator and a rubber gasket for sealing the metal member. Further, the rubber gasket for a fuel cell of the present invention can be preferably used in carrying out the above production method.

1 cell 2 MEA
3 Gas diffusion layer 4a Rubber gasket 4b Rubber gasket 5 Separator 6 Primer layer 7 Gas flow path

Claims (6)

  A step of applying a primer to a part of the surface of a rubber gasket for a fuel cell made of peroxide-crosslinked rubber, a step of closely adhering a primer coating surface of the rubber gasket for a fuel cell to a metal member for a fuel cell, and the fuel cell In the state where the rubber gasket for a fuel cell is fixed to the adhesion surface between the rubber gasket for a fuel cell and the metal member for a fuel cell while being compressed so that the compression ratio is 5 to 70%, A method for producing a fuel cell sealing body, comprising: a step of heating at 50 to 120 ° C. for 24 hours or more to bond a rubber gasket for a fuel cell and a metal member for a fuel cell.   After the step of applying a primer to a part of the surface of the fuel cell rubber gasket, a step of partially applying an adhesive to the primer application surface of the fuel cell rubber gasket to form an adhesive layer, The method for producing a fuel cell seal body according to claim 1, wherein the primer-coated surface on which the pressure-sensitive adhesive layer is partially formed is brought into close contact with the metal member for fuel cell.   The at least one selected from the group consisting of a silane coupling agent primer, a cyanoacrylate adhesive, an epoxy adhesive, a urethane adhesive, and a modified olefin adhesive is used as the primer. 3. A method for producing a fuel cell seal body according to 2.   The fuel cell with a metal fitting according to claim 2 or 3, wherein at least one selected from the group consisting of an acrylic adhesive, a silicone adhesive, a urethane adhesive, and a rubber adhesive is used as the adhesive. Manufacturing method of sealing body.   A rubber gasket for a fuel cell, wherein a primer layer is formed on a part of the surface of a rubber gasket for a fuel cell made of peroxide-crosslinked rubber.   The rubber gasket for a fuel cell according to claim 5, wherein an adhesive layer is partially formed on the primer layer.

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