JP2006155952A - Resin composition for fuel cell separator, and fuel cell separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition for producing a fuel cell separator, the resin composition being capable of suppressing a reduction in moldability and degradation in electric characteristics of the fuel cell separator molded using the resin composition. <P>SOLUTION: The resin composition contains a thermosetting resin and graphite particles. The proportion of the graphite particle content in the entire resin composition is within a range of 60% to 90% by weight. The graphite particles have a mean particle diameter of 40 to 60 μm, and the proportion of the graphite particles 100 μm or less in diameter in the cumulative particle size distribution is within a range of 85 to 100 cumulative percent. Alternatively, the graphite particles have a mean particle diameter of equal to or greater than 20 μm and smaller than 40 μm, and the proportion of the particles 100 μm or less in diameter in the cumulative particle size distribution is within a range of 95 to 100 cumulative percent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin composition for a fuel cell separator and a fuel cell separator obtained using the same.

  In recent years, global warming caused by carbon dioxide emitted by burning fossil fuels such as oil and coal has been taken up as an environmental problem. Under such circumstances, an energy saving effect can be expected, and a fuel cell is attracting attention as a clean power generation system, and its practical application is being studied in various fields.

  FIG. 1 is a perspective view schematically illustrating the basic structure of a fuel cell. According to this figure, a fuel electrode (negative electrode) 2 and an air electrode (positive electrode) 3 are arranged so as to sandwich an electrolyte 1. On both sides thereof, fuel cell separators 4 having a plurality of convex portions 5 formed on both side surfaces are arranged to constitute a unit cell (unit cell). The convex portion 5 constitutes a gas supply / discharge groove 6 which is a flow path of hydrogen and oxygen as fuel between adjacent convex portions 5. The gas supply / discharge groove 6 has a function of separating hydrogen, oxygen and cooling water flowing through the fuel cell so as not to mix, and transmits electric energy generated by the unit cell of the fuel cell to the outside or unit cell. It plays an important role of dissipating the heat generated in the outside.

  Then, several tens to several hundreds of the above unit cells are stacked to form a battery body (cell stack). In this unit cell, hydrogen is supplied to the fuel electrode 2 and oxygen is supplied to the air electrode 3 of a pair of electrodes facing each other through the electrolyte 1, and is directly converted into electric energy by an electrochemical reaction between hydrogen and oxygen. .

  That is, hydrogen is separated into electrons by the action of the catalyst in the fuel electrode 2 to form hydrogen ions, and these hydrogen ions move in the electrolyte 1. The hydrogen ions react with oxygen supplied to the air electrode 3 which is an opposing electrode and electrons returned through the external circuit to become water. Electricity is generated when electrons move through the external circuit.

  The electrolyte 1 has various types such as potassium hydroxide, phosphoric acid, and a polymer membrane, and the fuel cell is classified into an alkaline type, a phosphoric acid type, and a solid polymer type depending on the type.

  Among these, the polymer electrolyte fuel cell, in particular, has an operating temperature as low as about room temperature to about 120 ° C. and can be miniaturized, and therefore is expected to be applied to applications such as home use and automobiles.

  In such a fuel cell, the fuel cell separator 4 has strong conductivity and corrosion resistance (acid resistance), gas impermeability (air tightness), mechanical strength, impact resistance, and heat resistance. Many fuel cell separators have been proposed so far. For example, as the material constituting the fuel cell separator 4, various resin compositions containing a thermosetting resin such as a phenol resin, a thermoplastic resin such as polypropylene or polyvinylidene fluoride as a binder, and graphite particles as a conductive material. The thing is proposed (for example, refer patent documents 1-5).

However, when these conventional resin compositions for fuel cell separators are used to produce fuel cell separators, moldability often deteriorates (particularly, the unfilled portion may be found in the thinnest part of the fuel cell separator). There is a problem that electrical characteristics are likely to deteriorate, such as an increase in contact resistance.
JP 2003-297386 A JP 2003-346827 A JP 2004-55375 A JP 2003-268249 A JP 2002-343374 A

  Therefore, the present invention has been made in view of the circumstances as described above, and is a resin composition for solving the problems of the prior art and for producing a fuel cell separator, and using this resin composition It is an object of the present invention to provide a resin composition for a fuel cell separator that can suppress deterioration of moldability and electrical characteristics of the fuel cell separator that is molded.

  The resin composition for a fuel cell separator according to the present invention solves the above problems. First, in a resin composition containing a thermosetting resin component and a graphite particle component, the content of graphite particles is a resin. The graphite particles have an average particle size in the range of 40 to 60 μm and a cumulative particle size distribution of 85 to 100% of graphite particles having a particle size of 100 μm or less. Or graphite particles having an average particle size of 20 μm or more and less than 40 μm and a particle size distribution of 100 μm or less in the cumulative particle size distribution are in the range of 95 to 100% cumulative.

  Secondly, the resin composition for a fuel cell separator according to the present invention is characterized in that, in the fuel cell separator resin composition described above, an epoxy resin, a curing agent, and a curing accelerator are contained as a thermosetting resin component. And

  The resin composition for a fuel cell separator according to the present invention is, thirdly, in the above resin composition for a fuel cell separator, the fourth is that the melting point of the epoxy resin is in the range of 70 to 130 ° C. The curing accelerator is characterized by containing at least a phosphorus compound, and fifth, the stoichiometric equivalent ratio of the curing agent to the epoxy resin is 1-1.15. To do.

  Furthermore, the resin composition for a fuel cell separator of the present invention sixthly contains a phenol resin as a thermosetting resin component in the above resin composition for a fuel cell separator, and seventhly, The phenol resin is a resol type phenol resin having a melting point in the range of 70 to 80 ° C.

  An eighth aspect of the present invention is a fuel cell separator obtained by molding any one of the above resin compositions for a fuel cell separator. Ninth, the thickness of the thinnest portion is 0.00. It is the range of 1-0.2 mm, It is characterized by the above-mentioned.

  In the resin composition for a fuel cell separator according to the first aspect of the present invention, in the resin composition containing the thermosetting resin component and the graphite particle component, the graphite particle content is 60 to 90% by weight based on the total amount of the resin composition. The graphite particles have an average particle size in the range of 40 to 60 μm and a cumulative particle size distribution of graphite particles having a particle size of 100 μm or less is in the range of 85 to 100%, or the average particle size is When a fuel cell separator is manufactured using this resin composition for a fuel cell separator because graphite particles having a particle size of 20 μm or more and less than 40 μm and a particle size of 100 μm or less in the cumulative particle size distribution are in the range of 95 to 100%. Good moldability and high electrical properties are achieved.

  Moreover, in the said 2nd invention, the resin composition for fuel cell separators with favorable moldability and dimensional stability is obtained by containing an epoxy resin, a hardening | curing agent, and a hardening accelerator as a thermosetting resin component. .

  In the third aspect of the invention, by setting the melting point of the epoxy resin in the range of 70 to 130 ° C., a resin composition for a fuel cell separator having good dispersibility, high thermal stability, and easy handling can be obtained. In the resin composition for a fuel cell separator according to the fourth aspect of the invention, by containing a phosphorus compound as a curing accelerator, the elution of impurities from the fuel cell separator obtained using the resin composition for a fuel cell separator is suppressed. It is done. Furthermore, in the fifth invention, by setting the stoichiometric equivalent ratio of the curing agent to the epoxy resin to be 1-1.15, curing of the epoxy resin is sufficiently promoted at the time of molding, and has high strength. It becomes possible to manufacture a fuel cell separator with good moldability and less impurity elution.

  In the resin composition for a fuel cell separator according to the sixth aspect of the invention, by containing a phenol resin as the thermosetting resin component, the moldability of the fuel cell separator is improved using this, and the airtightness of the resulting fuel cell separator Also gets higher.

  Moreover, in the said 7th invention, the resin composition for fuel cell separators with a good moldability and easy handling is obtained by making a phenol resin into the resol type phenol resin which is 70-80 degreeC in melting | fusing point. .

  The fuel cell separator according to the eighth aspect of the invention is manufactured using the resin composition for a fuel cell separator, so that molding is easy and high electrical characteristics are realized. In the ninth aspect of the invention, Since the molding is easy, it is possible to obtain a fuel cell separator having a thickness of the thinnest portion in the range of 0.1 to 0.2 mm, and there is no unfilled portion, and good moldability and high Electrical properties are realized.

  The resin composition for a fuel cell separator of the present invention is a resin composition containing a thermosetting resin component and a graphite particle component, and the content of the graphite particles is 60 to 90% by weight based on the total amount of the resin composition. The graphite particles have an average particle size in the range of 40 to 60 μm and the cumulative particle size distribution has a particle size of 100 μm or less in the range of 85 to 100% or an average particle size of 20 μm. The graphite particles having a particle size of less than 40 μm and a particle size distribution of 100 μm or less in the cumulative particle size distribution are in a range of 95 to 100%.

  In the resin composition for a fuel cell separator according to the present invention, various thermosetting resin components that can be applied to resin molding are considered, including one or both of an epoxy resin and a phenol resin. It is preferable. In particular, an epoxy resin is preferable because it has few ionic impurities.

  When an epoxy resin is included as the thermosetting resin component, the epoxy resin is preferably solid. In particular, in order to prevent aggregation at room temperature, it is desirable that the melting point is in the range of 70 to 130 ° C. When the melting point is less than 70 ° C., the resin is likely to aggregate and the handleability is lowered. When the melting point is higher than 130 ° C., it may be difficult to knead the resin composition as a subsequent step, which is not preferable.

  Moreover, when the resin composition for fuel cell separators contains an epoxy resin as a thermosetting resin component, it may contain a curing agent. At this time, the curing agent may not contain an amine compound or an acid anhydride compound in consideration of maintaining high conductivity of the fuel cell separator 4, prevention of poisoning, prevention of impurity elution, and the like. desirable. Specifically, a phenol compound is preferably exemplified. Although it does not specifically limit about content of a hardening | curing agent, For example, the stoichiometric equivalent ratio of the hardening | curing agent with respect to an epoxy resin can be 1-1.15. Thereby, the curing of the epoxy resin is sufficiently promoted during molding, and a fuel cell separator having high strength can be manufactured. If it is less than 1, it is not preferable because sufficient strength may not be obtained. If it exceeds 1.15, the curing agent is unreacted and the remaining performance is lowered, and the moldability may be lowered or impurities may be eluted, which is not preferable.

  Moreover, this invention may use together the hardening accelerator with the said hardening | curing agent. Specifically, it is desirable to use a non-amine compound, and for example, a phosphorus compound such as triphenylphosphine is used. Although content of a hardening accelerator is adjusted suitably, it can be set as the range of 0.5 to 3 weight% with respect to a resin component (an epoxy resin and a hardening | curing agent), for example. If it is less than 0.5% by weight, the effect of promoting the curing cannot be enhanced, and workability may be deteriorated. If it exceeds 3% by weight, there is a possibility that defects in moldability may occur.

  On the other hand, when the resin composition for a fuel cell separator contains a phenol resin as a thermosetting resin component, it is preferable to use a phenol resin that undergoes a polymerization reaction by ring-opening polymerization as the phenol resin. In such a phenol resin, since no gas is generated due to dehydration in the molding process, generation of voids in the molded product, that is, the fuel cell separator 4 can be prevented, thereby ensuring high airtightness.

  Among various phenol resins, it is preferable to use a resol type phenol resin having a melting point of 70 to 80 ° C., specifically, from 13C-NMR analysis, ortho-ortho 25 to 35%, ortho-para 60 to 70%, It is preferable to use a resol-type phenol resin in which a para-para-5 to 10% structure is confirmed. The resol type phenolic resin is normally in a liquid state at normal temperature, but it is desirable that the resol type phenolic resin be a solid in consideration of the dispersibility of the thermosetting resin component in the resin composition for a fuel cell separator. Therefore, as described above, it is preferable to use one whose melting point is adjusted to 70 to 80 ° C.

  Thus, when the resin composition for a fuel cell separator contains either one or both of an epoxy resin and a phenol resin as the thermosetting resin component, the content of the epoxy resin or the phenol resin is not particularly limited. The total amount of the epoxy resin and the phenol resin can be in the range of 50 to 100% by weight with respect to the total amount of the thermosetting resin.

  Of course, as a thermosetting resin component, in addition to an epoxy resin or a phenol resin, one or more kinds of resins such as a polyimide resin, a melamine resin, an unsaturated polyester resin, and a diallyl phthalate resin may be further included. For example, the heat resistance and acid resistance of the resin composition for a fuel cell separator can be improved by adding a polyimide resin.

  In the fuel cell separator resin composition of the present invention, the graphite particle component is for reducing the specific resistance of the molded fuel cell separator 4 and improving the conductivity. The range is from 60 to 90% by weight based on the total amount of the resin composition for a fuel cell separator. When the content of the graphite particle component is less than 60% by weight, the electric characteristics required for the fuel cell separator 4 may not be sufficiently obtained. When the content is more than 90% by weight, the fuel cell separator 4 The required airtightness and moldability may not be obtained sufficiently.

  Whether the resin composition for a fuel cell separator of the present invention has, as graphite particles, an average particle size in the range of 40 to 60 μm and a cumulative particle size distribution of graphite particles having a particle size of 100 μm or less in a cumulative range of 85 to 100%, Alternatively, graphite particles having an average particle size of 20 μm or more and less than 40 μm and a cumulative particle size distribution having a particle size of 100 μm or less in a cumulative range of 95 to 100% are used. In the cumulative particle size distribution, if graphite particles having a particle size of 100 μm or less are cumulatively less than 85%, the moldability is lowered and an unfilled portion may be seen in the molded product. In addition, graphite particles having an average particle size of less than 20 μm or graphite particles having a particle size of 100 μm or less in the cumulative particle size distribution are cumulatively 85% or more and less than 95%, and graphite particles having an average particle size of less than 40 μm are liable to deteriorate in formability. In addition, graphite particles having an average particle size exceeding 60 μm or graphite particles having a particle size of 100 μm or less in the cumulative particle size distribution are cumulatively 85% or more and less than 95%, and graphite particles having an average particle size of 40 μm or more have a surface smoothness of the molded product. It may be damaged.

  The type of graphite particles is not particularly limited as long as it exhibits high conductivity. Examples include graphitized carbonaceous materials such as mesocarbon microbeads, graphitized coal-based coke and petroleum-based coke, processed powder of graphite electrodes and special carbon materials, natural graphite, quiche graphite, expanded graphite, etc. It is done. Only one kind of such graphite particles may be used, or a plurality of kinds of graphite particles may be mixed and used. The graphite particles may be either artificial graphite powder or natural graphite powder, but natural graphite powder is known to have high conductivity, and artificial graphite powder is known to have low anisotropy. Therefore, it may be appropriately selected as necessary. Among various types of graphite particles, spherical natural graphite is preferable because it does not cause orientation in the resin composition for a fuel cell separator and thus does not cause conductive anisotropy.

  Such a resin composition for a fuel cell separator may further contain various additives such as a release agent and a coupling agent as necessary. Specifically, one or more hydrocarbon compounds, amide compounds, fatty acid compounds, natural carnauba wax, and the like can be used as the release agent. In addition, as the coupling agent, silicon-based, titanate-based, aluminum-based and the like, specifically, epoxy silane or the like can be used. Such a coupling agent may be directly added to the resin composition for a fuel cell separator, or may be treated by injecting a solution diluted with an organic solvent or the like. Alternatively, it may be added by directly mixing with the graphite particle component in the resin composition for a fuel cell separator or by spraying a solution diluted with an organic solvent or the like.

  The resin composition for a fuel cell separator as described above can be obtained by blending the above components by an appropriate technique and kneading as necessary. For kneading, a normal kneader can be used, and preferable examples include those capable of changing the screw and paddle pattern among the twin screw extruders. As an example of these, there is a KRC kneader commercially available from Kurimoto Iron Works. This can be said to be appropriate in that the kneading zone ratio can be easily changed in addition to the rotation speed and temperature, and the kneading state of the compound can be easily adjusted.

  In addition, when blending each component, an organic solvent such as isopropyl alcohol may be added. It is desirable that the amount of the organic solvent used is an amount that can dissolve a part of the thermosetting resin. However, if the amount of the organic solvent used is too large, it takes a long time to remove the organic solvent after kneading, and productivity is increased. Therefore, it is desirable to make it 30% by weight or less with respect to the total solid content in the resin composition for a fuel cell separator.

  The thus obtained resin composition for a fuel cell separator is indefinite after kneading, but these may be further pulverized by a granulator or the like to form small-diameter particles.

  The present invention also provides a fuel cell separator by molding the above resin composition for a fuel cell separator. Since this fuel cell separator uses the above resin composition for a fuel cell separator, it can be easily molded and high electrical characteristics can be realized. In particular, even when the thickness of the thinnest portion of the fuel cell separator is in the range of 0.1 to 0.2 mm, an unfilled portion is not seen, and good moldability and high electrical characteristics can be realized.

  Hereinafter, examples will be shown, and the embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.

<Examples 1-5>
(1) Production of Resin Composition for Fuel Cell Separator 15% of isopropyl alcohol was sprayed on the composition having the conditions shown in Table 1, stirred, and then charged into a kneader heated to a predetermined temperature. As a kneader, an S2KRC kneader (manufactured by Kurimoto Iron Works) was used.

Subsequently, the obtained resin composition for a fuel cell separator was pulverized to a particle size of 500 μm or less with a granulator.
(2) Production of fuel cell separator The obtained pulverized product was compression molded under the conditions of a mold temperature of 185 ° C, a molding pressure of 35.3 MPa, and a molding time of 2 minutes. Next, pressure was released while the mold was closed, and the mold was held for 30 seconds as a pressure release process. Then, the mold was opened, and the molded product was taken out. The molded product is a fuel cell separator 4 having the shape shown in FIG. 1 and is 50 mm in size, each having a size of 200 mm × 250 mm × 1.5 mm, and the thinnest part being 0.2 mm and 0.1 mm. Molded.
(3) Evaluation Formability: 50 samples (moldability 1: thinnest part 0.2 mm, moldability 2: thinnest part 0.1 mm) using the obtained resin composition for a fuel cell separator under the same conditions. ), The presence or absence of defective filling was confirmed by observing the appearance of the thinnest part, and the number of defective products was evaluated.

Volume resistivity: A portion of the fuel cell separator molded product without a groove was cut out to prepare a test piece of F50 mm × thickness 3 mm, and the volume resistivity was measured according to JIS K7194.
<Comparative Examples 1-2>
Graphite particles whose average particle size is in the range of 40 to 60 μm and whose particle size is 100 μm or less in the cumulative particle size distribution are not within the range of 85 to 100%, or whose average particle size is 20 μm or more and less than 40 μm and in the cumulative particle size distribution A fuel cell separator resin composition was produced by the same method as in Example 1 except that graphite particles having a particle size of 100 μm or less were not accumulated in the range of 95 to 100%, and this was used to produce a fuel cell separator 4 Was molded.

  The evaluation results are shown in Table 1.

なお、表１において、＊１〜＊１１は次のものを表す。
＊１ ＥＯＣＮ−１０２０−７５（日本化薬）
＊２ ＰＳＭ４３５７（群栄化学工業）
＊３ トリフェニルホスフィン（四国化成）
＊４ ＷＦ−５０Ａ−１００Ｍ（中越黒鉛工業所）平均粒径５０μｍ
＊５ ＷＲ−３０Ａ−１００Ｍ（中越黒鉛工業所）平均粒径３０μｍ
＊６ ＷＲ−ＳＣＬ（中越黒鉛工業所）平均粒径３０μｍ
＊７ ＷＲ−５０Ａ（中越黒鉛工業所）平均粒径５０μｍ
＊８ ＷＲ−３０Ａ（中越黒鉛工業所）平均粒径３０μｍ
＊９ Ａ１８７（日本ユニカー）
＊１０ Ｆ１−１００（大日化学工業）
＊１１ Ｊ−９００（大日化学工業）
＊１２ サンプルＡ（群栄化学工業）融点７５℃、１３Ｃ−ＮＭＲ分析でオルト−オルト２５〜３５％、オルト−パラ６０〜７０％、パラ−パラ５〜１０％の構造である。
＊１３ 当量 エポキシ／フェノール＝１／１．１２＝０．８９
表１より、黒鉛粒子の含有量は樹脂組成物全量に対して６０〜９０重量％の範囲であり、この黒鉛粒子は、平均粒径が４０〜６０μｍの範囲で且つ累積粒度分布において粒径１００μｍ以下の黒鉛粒子が累積８５〜１００％の範囲であるか、もしくは、平均粒径が２０μｍ以上４０μｍ未満で且つ累積粒度分布において粒径１００μｍ以下の黒鉛粒子が累積９５〜１００％の範囲である燃料電池セパレータ用樹脂組成物（実施例１〜５）を用いることにより、成形性が良好で燃料電池セパレータを得ることができることが示された。

In Table 1, * 1 to * 11 represent the following.
* 1 EOCN-1020-75 (Nippon Kayaku)
* 2 PSM4357 (Gunei Chemical Industry)
* 3 Triphenylphosphine (Shikoku Chemicals)
* 4 WF-50A-100M (Chuetsu Graphite Industry) Average particle size 50μm
* 5 WR-30A-100M (Chuetsu Graphite Industry) Average particle size 30μm
* 6 WR-SCL (Chuetsu Graphite Industry) average particle size 30μm
* 7 WR-50A (Chuetsu Graphite Industry) Average particle size 50μm
* 8 WR-30A (Chuetsu Graphite Industry) Average particle size of 30μm
* 9 A187 (Nihon Unicar)
* 10 F1-100 (Daichi Chemical Industry)
* 11 J-900 (Daichi Chemical Industry)
* 12 Sample A (Gunei Chemical Industry Co., Ltd.) Melting point: 75 ° C., 13-NMR analysis: ortho-ortho 25-35%, ortho-para 60-70%, para-para 5-10%.
* 13 Equivalent Epoxy / Phenol = 1 / 1.12 = 0.89
From Table 1, the content of graphite particles is in the range of 60 to 90% by weight with respect to the total amount of the resin composition, and the graphite particles have an average particle size in the range of 40 to 60 μm and a particle size of 100 μm in the cumulative particle size distribution. The following graphite particles have a cumulative range of 85 to 100%, or a fuel having an average particle size of 20 μm or more and less than 40 μm and a cumulative particle size distribution of graphite particles having a particle size of 100 μm or less in the range of 95 to 100%. It was shown that by using the battery separator resin composition (Examples 1 to 5), the moldability was good and a fuel cell separator could be obtained.

  On the other hand, even if the content of the graphite particles is in the range of 60 to 90% by weight with respect to the total amount of the resin composition, the graphite particles having an average particle size in the range of 40 to 60 μm, but having a particle size of 100 μm or less. When the cumulative particle size is not in the range of 85 to 100% (Comparative Example 1), or when the average particle size of the graphite particles is 20 μm or more and less than 40 μm, but the graphite particles with a particle size of 100 μm or less is not in the cumulative 95 to 100% range (Comparative Example) In 2), it was confirmed that the moldability was remarkably deteriorated. In addition, in the measurement of volume resistivity with the test piece cut out from the fuel cell separator molded product, no significant difference was confirmed between the example and the comparative example, but the electrical characteristics of the fuel cell separator molded product were the fuel produced in the example. It was confirmed that the battery separator molded product had better electrical characteristics because it had better moldability than the comparative example.

It is the perspective view which illustrated the basic structure of the fuel cell typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrolyte 2 Fuel electrode 3 Air electrode 4 Fuel cell separator 5 Convex part 6 Gas supply / discharge groove

Claims (9)

  In the resin composition containing the thermosetting resin component and the graphite particle component, the content of the graphite particles is in the range of 60 to 90% by weight with respect to the total amount of the resin composition, and the graphite particles have an average particle size of 40. Graphite particles with a particle size of 100 μm or less in the cumulative particle size distribution in the range of ˜60 μm are in the range of 85% to 100% cumulative, or the average particle size is 20 μm or more and less than 40 μm and the cumulative particle size distribution has a particle size of 100 μm or less. A resin composition for a fuel cell separator, characterized in that the graphite particles have a cumulative range of 95 to 100%.   The resin composition for a fuel cell separator according to claim 1, comprising an epoxy resin, a curing agent, and a curing accelerator as the thermosetting resin component.   The resin composition for a fuel cell separator according to claim 2, wherein the melting point of the epoxy resin is in the range of 70 to 130 ° C.   4. The resin composition for a fuel cell separator according to claim 2, wherein the curing accelerator contains at least a phosphorus compound.   The resin composition for a fuel cell separator according to any one of claims 2 to 4, wherein the stoichiometric equivalent ratio of the curing agent to the epoxy resin is 1-1.15.   The resin composition for a fuel cell separator according to any one of claims 1 to 5, comprising a phenol resin as the thermosetting resin component.   The resin composition for a fuel cell separator according to claim 6, wherein the phenol resin is a resol type phenol resin having a melting point in the range of 70 to 80 ° C.   A fuel cell separator obtained by molding the resin composition for a fuel cell separator according to claim 1. 9. The fuel cell separator according to claim 8, wherein the thickness of the thinnest part is in the range of 0.1 to 0.2 mm.

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