JP6865147B2 - Fuel cell separator - Google Patents
Fuel cell separator Download PDFInfo
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- JP6865147B2 JP6865147B2 JP2017208763A JP2017208763A JP6865147B2 JP 6865147 B2 JP6865147 B2 JP 6865147B2 JP 2017208763 A JP2017208763 A JP 2017208763A JP 2017208763 A JP2017208763 A JP 2017208763A JP 6865147 B2 JP6865147 B2 JP 6865147B2
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- 239000000446 fuel Substances 0.000 title claims description 91
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 58
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 58
- 229920005989 resin Polymers 0.000 claims description 56
- 239000011347 resin Substances 0.000 claims description 56
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 51
- 229910002804 graphite Inorganic materials 0.000 claims description 48
- 239000010439 graphite Substances 0.000 claims description 48
- 239000012778 molding material Substances 0.000 claims description 28
- 238000005452 bending Methods 0.000 claims description 15
- 239000000155 melt Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- 229920005992 thermoplastic resin Polymers 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 42
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000012733 comparative method Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Fuel Cell (AREA)
Description
本発明は、次世代エネルギー技術の有力候補である燃料電池の燃料電池用セパレータに関するものである。 The present invention relates to a fuel cell separator for a fuel cell, which is a promising candidate for next-generation energy technology.
燃料電池は、必要なエネルギー量に応じて複数の単位セルが一列に積層され、各単位セルが燃料電池用セパレータや膜電極接合体（ＭＥＡ）等から形成されており、水素と酸素の反応により、水を生成する過程で発電する発電装置である。この装置の部品の中で、燃料電池用セパレータは、燃料電池の大部分を占める重要な部品であり、高い物性、例えば低い電気抵抗値、優れたガス透過性・導電性・曲げ強度、薄肉化等が求められている（特許文献１、２、３、４参照）。 In a fuel cell, a plurality of unit cells are stacked in a row according to the required amount of energy, and each unit cell is formed of a fuel cell separator, a membrane electrode assembly (MEA), etc., and is formed by a reaction between hydrogen and oxygen. , A power generator that generates electricity in the process of generating water. Among the parts of this device, the fuel cell separator is an important part that occupies most of the fuel cell, and has high physical characteristics such as low electrical resistance, excellent gas permeability / conductivity / bending strength, and thinning. Etc. (see Patent Documents 1, 2, 3, and 4).
このような燃料電池用セパレータを製造する場合には、熱可塑性樹脂と黒鉛とが所定量混合した成形材料で成形する方法が採用されている。熱可塑性樹脂としては、機械的強度・成形性・耐久性・耐薬品性等に優れるポリフェニレンスルフィド（ＰＰＳ）樹脂等が採用されている。 When manufacturing such a separator for a fuel cell, a method of molding with a molding material in which a predetermined amount of a thermoplastic resin and graphite are mixed is adopted. As the thermoplastic resin, a polyphenylene sulfide (PPS) resin or the like having excellent mechanical strength, moldability, durability, chemical resistance and the like is adopted.
従来における燃料電池用セパレータは、以上のように構成され、成形材料の熱可塑性樹脂と黒鉛とが単に配合・混合されるので、１００［Ｗ／ｍＫ］以上の高い熱伝導率を得ることが困難であり、長期の使用に問題がある。 The conventional separator for a fuel cell is configured as described above, and it is difficult to obtain a high thermal conductivity of 100 [W / mK] or more because the thermoplastic resin of the molding material and graphite are simply blended and mixed. There is a problem with long-term use.
係る問題について詳しく説明すると、燃料電池用セパレータは、多数枚（例えば、自動車用の場合、４００枚）の積層が要求されるのに鑑み、薄肉化が図られているが、薄肉化のために熱可塑性樹脂の樹脂比率を増大させると、ガスリーク性が向上するものの、電気抵抗値が上昇するので、比例して熱伝導率が下がることとなる。例えば、従来における燃料電池用セパレータは、薄肉化の観点から、熱可塑性樹脂の樹脂比率を増大させている関係上、２５〜４２［Ｗ／ｍＫ］の熱伝導率を得ることはできるが、１００［Ｗ／ｍＫ］以上の熱伝導率を得ることは非常に困難である。 Explaining the problem in detail, the fuel cell separator is thinned in view of the fact that a large number of separators (for example, 400 in the case of an automobile) are required to be laminated. Increasing the resin ratio of the thermoplastic resin improves the gas leak property, but increases the electrical resistance value, so that the thermal conductivity decreases proportionally. For example, the conventional separator for a fuel cell can obtain a thermal conductivity of 25 to 42 [W / mK] because the resin ratio of the thermoplastic resin is increased from the viewpoint of thinning, but 100. It is very difficult to obtain a thermal conductivity of [W / mK] or higher.
しかしながら、近年の燃料電池は、運転中の熱コントロールが重視され、１００［Ｗ／ｍＫ］以上の高い熱伝導率が切望されている。これは、熱伝導率が高ければ、水の生成熱等を燃料電池用セパレータの一部ではなく、全体に拡散・伝熱することができるので、燃料電池用セパレータの長期に亘る使用が期待できるからである。したがって、熱伝導率が２５〜４２［Ｗ／ｍＫ］という低い値では、水の生成熱等を燃料電池用セパレータの一部にしか伝熱できないおそれがあり、燃料電池用セパレータの長期使用に困難が生じる。 However, in recent fuel cells, heat control during operation is emphasized, and a high thermal conductivity of 100 [W / mK] or more is desired. This is because if the thermal conductivity is high, the heat generated by water can be diffused and transferred to the entire fuel cell separator, not a part of the fuel cell separator, so that the fuel cell separator can be expected to be used for a long period of time. Because. Therefore, if the thermal conductivity is as low as 25 to 42 [W / mK], the heat generated by water may be transferred to only a part of the fuel cell separator, which makes it difficult to use the fuel cell separator for a long period of time. Occurs.
本発明は上記に鑑みなされたもので、１００［Ｗ／ｍＫ］以上の高い熱伝導率を得ることができ、長期の使用に資することのできる燃料電池用セパレータを提供することを目的としている。 The present invention has been made in view of the above, and an object of the present invention is to provide a fuel cell separator capable of obtaining a high thermal conductivity of 100 [W / mK] or more and contributing to long-term use.
本発明においては上記課題を解決するため、熱可塑性樹脂と導電材とを含有する成形材料により成形され、燃料と酸化剤用の流路を有する燃料電池用セパレータであり、
成形材料の熱可塑性樹脂がポリフェニレンスルフィド系樹脂とされるとともに、導電材が黒鉛とされ、これらポリフェニレンスルフィド系樹脂と黒鉛とが重量配合比１００：１７００〜２５００で混合されることにより、熱伝導率が１００［Ｗ／ｍＫ］以上とされることを特徴としている。
In the present invention, in order to solve the above problems, it is a fuel cell separator that is molded from a molding material containing a thermoplastic resin and a conductive material and has a flow path for fuel and an oxidant.
The thermoplastic resin of the molding material is a polyphenylene sulfide resin, the conductive material is graphite, and these polyphenylene sulfide resins and graphite are mixed at a weight blending ratio of 100: 1700 to 2500 to achieve thermal conductivity. Is 100 [W / mK] or more.
なお、曲げ強度が２５［ＭＰａ］以上であることが好ましい。
また、ポリフェニレンスルフィド系樹脂のメルトフローレートが１２０［ｇ／１０ｍｉｎ］以上に設定されることが好ましい。より好ましくは、ポリフェニレンスルフィド系樹脂のメルトフローレートが６５０［ｇ／１０ｍｉｎ］以上４１００［ｇ／１０ｍｉｎ］以下に設定されると良い。
また、黒鉛の平均粒径が１００μｍ以上１５０μｍ以下にされると良い。
The bending strength is preferably 25 [MPa] or more.
Further, it is preferable that the melt flow rate of the polyphenylene sulfide resin is set to 120 [g / 10 min] or more. More preferably, the melt flow rate of the polyphenylene sulfide resin is set to 650 [g / 10 min] or more and 4100 [g / 10 min] or less.
Further, it is preferable that the average particle size of graphite is 100 μm or more and 150 μm or less.
ここで、特許請求の範囲における黒鉛は、異方性でも良いし、等方性でも良い。また、鱗片状タイプ、鱗状タイプ、土状タイプ、人造タイプ、膨張タイプ等があるが、特に問うものではない。混合という用語には、混練が含まれる。さらに、本発明に係る燃料電池用セパレータは、家庭用、小型店舗用、自動車用、モバイル機器用等の燃料電池に利用することができる。 Here, the graphite in the claims may be anisotropic or isotropic. In addition, there are scaly type, scaly type, earthy type, artificial type, swelling type, etc., but they are not particularly asked. The term mixing includes kneading. Further, the fuel cell separator according to the present invention can be used for fuel cells for households, small stores, automobiles, mobile devices, and the like.
本発明によれば、成形材料のポリフェニレンスルフィド系樹脂に大量の黒鉛粒子を配合するので、大量の黒鉛粒子が熱伝導路を形成し、燃料電池用セパレータの熱伝導率が１００［Ｗ／ｍＫ］以上となる。 According to the present invention, since a large amount of graphite particles are mixed with the polyphenylene sulfide resin as a molding material, a large amount of graphite particles form a heat conduction path, and the thermal conductivity of the fuel cell separator is 100 [W / mK]. That is all.
本発明によれば、ポリフェニレンスルフィド系樹脂と黒鉛とが重量配合比１００：１７００〜２５００で混合されるので、１００［Ｗ／ｍＫ］以上の高い熱伝導率を得ることができ、燃料電池用セパレータを長期に亘って使用することができるという効果がある。 According to the present invention, since the polyphenylene sulfide resin and graphite are mixed at a weight compounding ratio of 100: 1700 to 2500, a high thermal conductivity of 100 [W / mK] or more can be obtained, and a separator for a fuel cell can be obtained. Has the effect of being able to be used for a long period of time.
以下、本発明の好ましい実施の形態を説明すると、本実施形態における燃料電池用セパレータは、熱可塑性樹脂と導電材とを含有する成形材料により成形され、燃料と酸化剤用の流路を複数有する板形のセパレータであり、成形材料の熱可塑性樹脂がポリフェニレンスルフィド系樹脂とされるとともに、導電材が黒鉛とされ、これらポリフェニレンスルフィド系樹脂と黒鉛とが重量配合比１００：１７００〜２５００で混合されることにより、熱伝導率が１００［Ｗ／ｍＫ］以上とされる。 Hereinafter, a preferred embodiment of the present invention will be described. The separator for a fuel cell in the present embodiment is molded from a molding material containing a thermoplastic resin and a conductive material, and has a plurality of flow paths for the fuel and the oxidizing agent. It is a plate-shaped separator, and the thermoplastic resin of the molding material is a polyphenylene sulfide resin, the conductive material is graphite, and these polyphenylene sulfide resins and graphite are mixed at a weight blending ratio of 100: 1700 to 2500. As a result, the thermal conductivity is set to 100 [W / mK] or more.
燃料電池用セパレータは、図示しないが、平面略矩形の薄い板を備え、この板の略平坦な表裏両面の周縁部以外の中央部に、燃料用の流通路を区画する複数の流路が横一列に並んでそれぞれ平面略Ｓ字形に配列形成されており、電解質層、空気極、燃料極と共に積層されて燃料電池を構成する。板の周縁部には、複数の流路の端部に略連通する複数の貫通口が並べて穿孔され、各貫通口が略トラック形に形成される。また、各流路は、断面略Ｕ字の溝形に凹み形成される。 Although not shown, the fuel cell separator is provided with a thin plate having a substantially rectangular plane, and a plurality of flow paths for partitioning the flow passage for fuel are lateral to the central portion other than the peripheral edges on both the front and back surfaces, which are substantially flat. They are lined up in a row and arranged in a substantially S-shape on a plane, and are laminated together with an electrolyte layer, an air electrode, and a fuel electrode to form a fuel cell. A plurality of through holes that substantially communicate with the ends of the plurality of flow paths are perforated side by side on the peripheral edge of the plate, and each through hole is formed in a substantially track shape. Further, each flow path is formed as a recess in a groove shape having a substantially U-shaped cross section.
成形材料の熱可塑性樹脂は、機械的強度・成形性・耐久性・耐薬品性等に優れる粉末のポリフェニレンスルフィド系樹脂が使用される。このポリフェニレンスルフィド系樹脂は、ポリフェニレンスルフィド骨格を有していれば良く、ポリフェニレンスルフィドと同族ポリマー（例えば、ポリフェニレンスルフィドケトンＰＰＳＫ，ポリフェニレンスルフィドスルホンＰＰＳＳ，ポリビフェニレンスルフィドＰＢＰＳ等）も含まれる。 As the thermoplastic resin of the molding material, a powdered polyphenylene sulfide resin having excellent mechanical strength, moldability, durability, chemical resistance and the like is used. This polyphenylene sulfide-based resin may have a polyphenylene sulfide skeleton, and may also contain polymers similar to polyphenylene sulfide (for example, polyphenylene sulfide ketone PPSK, polyphenylene sulfide sulfone PPSS, polybiphenylene sulfide PBPS, etc.).
ポリフェニレンスルフィド系樹脂は、部分的な架橋構造を有していても良く、逆に架橋構造を有していなくても良い。また、ポリフェニレンスルフィド系樹脂は、直鎖構造を有する直鎖型（通常、リニア型又はセミリニア型と称する）でも良いし、分岐構造を有する分岐型でも良いが、通常は直鎖型が好ましい。さらに、ポリフェニレンスルフィド系樹脂は、ベンゼン環に置換基を有していても良い。 The polyphenylene sulfide resin may have a partially crosslinked structure, and conversely, the polyphenylene sulfide resin may not have a crosslinked structure. The polyphenylene sulfide resin may be a linear type having a linear structure (usually referred to as a linear type or a semi-linear type) or a branched type having a branched structure, but the linear type is usually preferable. Further, the polyphenylene sulfide resin may have a substituent on the benzene ring.
なお、ポリフェニレンスルフィド系樹脂は、溶出イオン防止の観点から、酸や水等により洗浄して使用されることが好ましい。これは、ポリフェニレンスルフィド系樹脂を洗浄して使用すれば、燃料電池の作動中に熱水中に溶出するイオンを低減し、燃料電池の劣化を防止することができるからである。 The polyphenylene sulfide resin is preferably used after being washed with an acid, water, or the like from the viewpoint of preventing elution ions. This is because if the polyphenylene sulfide resin is washed and used, the ions eluted in hot water during the operation of the fuel cell can be reduced and the deterioration of the fuel cell can be prevented.
黒鉛は、大量の粉末の黒鉛粒子が用いられるのが好ましい。この黒鉛粒子としては、球状の黒鉛粒子（例えば、球状化された天然黒鉛、人造黒鉛、フリュートコークス、ギルソナイトコークス等）、アスペクト比が２．０以下の黒鉛粉末（例えば、アスペクト比１〜２．０程度の天然黒鉛粉末や人造黒鉛粉末）等があげられる。また、黒鉛粒子の平均粒径は、特に限定されるものではないが、取り扱いを容易にする観点から、１００μｍ以上１５０μｍ以下、好ましくは１１５μｍ以上１３５μｍ以下、より好ましくは１１８μｍ以上１２２μｍ以下とされる。この黒鉛粒子の具体例としては、例えば８０２０ＳＪ（オリエンタル産業株式会社製：製品名）等があげられる。 As the graphite, it is preferable to use a large amount of powdered graphite particles. The graphite particles include spherical graphite particles (for example, spheroidized natural graphite, artificial graphite, flute coke, gilsonite coke, etc.) and graphite powder having an aspect ratio of 2.0 or less (for example, aspect ratios 1 to 1). Natural graphite powder and artificial graphite powder of about 2.0) and the like can be mentioned. The average particle size of the graphite particles is not particularly limited, but is 100 μm or more and 150 μm or less, preferably 115 μm or more and 135 μm or less, and more preferably 118 μm or more and 122 μm or less from the viewpoint of facilitating handling. Specific examples of these graphite particles include 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) and the like.
ポリフェニレンスルフィド系樹脂と黒鉛とは、電気抵抗値を低減し、熱伝導率を向上させる観点から、重量配合比１００：１７００〜２５００、好ましくは１００：１７５０〜２４５０、より好ましくは１００：１８００〜２４００で攪拌・混合される。 From the viewpoint of reducing the electric resistance value and improving the thermal conductivity of the polyphenylene sulfide resin and graphite, the weight compounding ratio is 100: 1700 to 2500, preferably 100: 1750 to 2450, and more preferably 100: 1800 to 2400. Stir and mix with.
ポリフェニレンスルフィド系樹脂のメルトフローレート（Ｍｅｌｔ Ｆｌｏｗ Ｒａｔｅ：ＭＦＲ）は、溶融したポリフェニレンスルフィド系樹脂の流動性の大きさを数値で示す指標であり、１２０［ｇ／１０ｍｉｎ］以上に設定される。具体的には、１２０［ｇ／１０ｍｉｎ］以上４１００［ｇ／１０ｍｉｎ］以下、好ましくは６５０［ｇ／１０ｍｉｎ］以上４１００［ｇ／１０ｍｉｎ］以下、より好ましくは７００［ｇ／１０ｍｉｎ］以上４０５０［ｇ／１０ｍｉｎ］以下に設定される。 The melt flow rate (MFR) of the polyphenylene sulfide-based resin is an index that numerically indicates the magnitude of the fluidity of the molten polyphenylene sulfide-based resin, and is set to 120 [g / 10 min] or more. Specifically, 120 [g / 10min] or more and 4100 [g / 10min] or less, preferably 650 [g / 10min] or more and 4100 [g / 10min] or less, more preferably 700 [g / 10min] or more and 4050 [g]. / 10min] or less.
メルトフローレートが１２０［ｇ／１０ｍｉｎ］以上なのは、１２０［ｇ／１０ｍｉｎ］以下の場合には、ポリフェニレンスルフィド系樹脂の流動性が悪化して燃料電池用セパレータの熱伝導率を悪化させ、熱伝導率が１００［Ｗ／ｍＫ］未満となるからである。 When the melt flow rate is 120 [g / 10 min] or more, when it is 120 [g / 10 min] or less, the fluidity of the polyphenylene sulfide resin deteriorates and the thermal conductivity of the fuel cell separator deteriorates, resulting in thermal conductivity. This is because the rate is less than 100 [W / mK].
メルトフローレートの測定は、材料の種類毎に決められる標準条件の温度及び載荷荷重の下、シリンダの底部に設置された規定口径のダイスから１０分当たりに押し出される樹脂量を計測して得られる。また、ポリフェニレンスルフィド系樹脂のメルトフローレートの上限値は、下限値と異なり、特に限定されるものではないが、実用性を考慮すると、４１００［ｇ／１０ｍｉｎ］以下が良い。 The melt flow rate is measured by measuring the amount of resin extruded per 10 minutes from a die with a specified diameter installed at the bottom of the cylinder under standard conditions of temperature and load, which are determined for each material type. .. The upper limit of the melt flow rate of the polyphenylene sulfide resin is different from the lower limit and is not particularly limited, but in consideration of practicality, it is preferably 4100 [g / 10 min] or less.
熱伝導率は、水の生成熱や燃料電池運転温度からの熱を燃料電池用セパレータの全体に拡散・伝熱する観点から、１００［Ｗ／ｍＫ］以上であれば良い。好ましくは１１０［Ｗ／ｍＫ］以上、より好ましくは１１４［Ｗ／ｍＫ］以上が良い。この熱伝導率は、定常比較法である円板熱流計法（ＡＳＴＭ Ｅ１５３０では保護熱流計法という）により測定される。 The thermal conductivity may be 100 [W / mK] or more from the viewpoint of diffusing and transferring the heat generated by water and the heat from the fuel cell operating temperature to the entire fuel cell separator. It is preferably 110 [W / mK] or more, more preferably 114 [W / mK] or more. This thermal conductivity is measured by a disk heat flow metering method (referred to as a protective heat flow metering method in ASTM E1530), which is a steady-state comparative method.
上記において、熱伝導率が１００［Ｗ／ｍＫ］以上の燃料電池用セパレータを製造する場合には、粉末のポリフェニレンスルフィド系樹脂と多量の粉末の黒鉛粒子とを所定の重量配合比でタンブラーボトルやヘンシェルミキサ等に多数のジルコニアボールと共に加え、配合機により所定の時間、攪拌・混合し、燃料電池用セパレータの成形材料を調製する。この際、粉末のポリフェニレンスルフィド系樹脂が溶融しないよう、加熱することなく配合することが好ましい。 In the above, when manufacturing a fuel cell separator having a thermal conductivity of 100 [W / mK] or more, a tumbler bottle or a tumbler bottle or a tumbler bottle containing a large amount of powdered polyphenylene sulfide resin and a large amount of powdered graphite particles in a predetermined weight blending ratio. Add a large number of zirconia balls to a Henschel mixer or the like, and stir and mix for a predetermined time with a compounding machine to prepare a molding material for a fuel cell separator. At this time, it is preferable to mix the powdered polyphenylene sulfide resin without heating so that the resin does not melt.
こうして成形材料を調製したら、離型剤が予め塗布された燃料電池用セパレータの専用金型の下型に成形材料を充填し、この成形材料をスクレーバで平らにならし、下型をプッシャで軽く押圧してエアを外部に抜いた後、下型に専用金型の上型を嵌合してプレス機で本加熱加圧することにより、燃料電池用セパレータを圧縮成形する。成形材料の充填に際しては、専用金型の成形温度をポリフェニレンスルフィド系樹脂の融点よりも低くしておくことが好ましい。 After preparing the molding material in this way, fill the lower mold of the special mold for the fuel cell separator coated with the mold release agent in advance, flatten the molding material with a scraper, and lightly lighten the lower mold with a pusher. After pressing and bleeding air to the outside, the upper die of the special die is fitted to the lower die and the main heating and pressurization is performed by the press machine to compression mold the fuel cell separator. When filling the molding material, it is preferable to keep the molding temperature of the special mold lower than the melting point of the polyphenylene sulfide resin.
成形材料を充填する場合には、燃料電池用セパレータの板と複数の流路とで成形材料の成形量が相違し、しかも、粉末の黒鉛粒子の流動性が低いので、これを考慮して充填する。具体的な充填方法としては、（１）専用金型の下型に計量した成形材料を充填してスクレーバ等により均一に広げてならし、複数の流路を成形する専用金型の成形部の成形材料をスクレーバ等によりかき取り、成形材料をバランス良く充填する方法、（２）燃料電池用セパレータの形状を考慮し、専用金型の下型に成形材料をディスペンサーにより増減させながら充填する方法のいずれかが選択して採用される。 When filling the molding material, the molding amount of the molding material differs between the plate of the fuel cell separator and the plurality of flow paths, and the fluidity of the powdered graphite particles is low. To do. Specific filling methods include (1) filling the lower mold of the dedicated mold with the weighed molding material, spreading it evenly with a scraper or the like, and forming a plurality of flow paths in the molding portion of the dedicated mold. A method of scraping the molding material with a scraper or the like and filling the molding material in a well-balanced manner, and (2) a method of filling the lower mold of the dedicated mold with the molding material while increasing or decreasing it with a dispenser in consideration of the shape of the fuel cell separator. Either one is selected and adopted.
エアを外部に抜いた場合には、プレス機で直ちに本加熱加圧しても良いが、本加熱加圧の前段階で予備加熱加圧すれば、燃料電池用セパレータの低温割れの防止、硬化組織の生成防止、延性・じん性等の機械的性質の向上、変形・残留応力の低減を図ることができる。専用金型の加熱加圧に際しては、成形材料の充填された専用金型を成形機の所定温度まで加熱した一対の熱板間にセットして加熱加圧する。また、専用金型の加熱温度はポリフェニレンスルフィド系樹脂の融点＋１００℃〜＋１５０℃程度が好ましく、専用金型の加圧圧力は３００ｋｇ／ｃｍ２以上が必要である。 When air is evacuated to the outside, the main heating and pressurization may be performed immediately with a press machine, but if preheating and pressurizing is performed before the main heating and pressurization, low temperature cracking of the fuel cell separator can be prevented and the cured structure It is possible to prevent the formation of heat, improve mechanical properties such as ductility and toughness, and reduce deformation and residual stress. When heating and pressurizing the dedicated mold, the dedicated mold filled with the molding material is set between a pair of hot plates heated to a predetermined temperature of the molding machine and heated and pressurized. The heating temperature of the dedicated mold is preferably about + 100 ° C to + 150 ° C, which is the melting point of the polyphenylene sulfide resin, and the pressurizing pressure of the dedicated mold needs to be 300 kg / cm 2 or more.
専用金型が加熱加圧されると、成形材料の加圧に伴い、大量に配合された複数の黒鉛粒子が密接してその間にポリフェニレンスルフィド系樹脂の流入する空隙が形成され、ポリフェニレンスルフィド系樹脂の融点を越えた温度域でポリフェニレンスルフィド系樹脂が流動し始め、複数の黒鉛粒子の周囲やその間にポリフェニレンスルフィド系樹脂が流動・流入することとなる。専用金型の加熱加圧時間としては、複数の黒鉛粒子の間にポリフェニレンスルフィド系樹脂が流入するのに要する時間であれば良い。 When the special mold is heated and pressurized, a large amount of compounded graphite particles are brought into close contact with each other as the molding material is pressurized, and voids through which the polyphenylene sulfide-based resin flows are formed between them, so that the polyphenylene sulfide-based resin is formed. The polyphenylene sulfide-based resin begins to flow in a temperature range exceeding the melting point of the above, and the polyphenylene sulfide-based resin flows and flows in and around the plurality of graphite particles and between them. The heating and pressurizing time of the dedicated mold may be any time required for the polyphenylene sulfide-based resin to flow between the plurality of graphite particles.
燃料電池用セパレータを圧縮成形したら、専用金型を所定の時間冷却し、専用金型から燃料電池用セパレータを脱型すれば、表裏両面にサーペイン型の流路を複数備えた薄い燃料電池用セパレータを製造することができる。専用金型を冷却する方法としては、（１）専用金型を取り外して冷却された別の成形機の一対の熱板間にセットし、加圧冷却する方法、（２）専用金型を成形機の一対の熱板間にセットしたままで加圧冷却する方法等があげられる。 After compression molding the fuel cell separator, cool the dedicated mold for a specified period of time, and then remove the fuel cell separator from the dedicated mold to create a thin fuel cell separator with multiple surface-type channels on both the front and back sides. Can be manufactured. The methods for cooling the dedicated mold include (1) removing the dedicated mold, setting it between a pair of hot plates of another cooled molding machine, and pressurizing and cooling it, and (2) molding the dedicated mold. Examples include a method of pressurizing and cooling while the machine is set between a pair of hot plates.
専用金型は、ポリフェニレンスルフィド系樹脂の融点以下、好ましくはポリフェニレンスルフィド系樹脂の融点−１００℃以下、より好ましくはポリフェニレンスルフィド樹脂のガラス転移点以下まで冷却する。これは、係る温度まで専用金型を冷却すれば、燃料電池用セパレータの導電性が向上し、燃料電池用セパレータの反りや曲がりの低減に資するからである。 The dedicated mold is cooled to below the melting point of the polyphenylene sulfide resin, preferably below the melting point of the polyphenylene sulfide resin of −100 ° C., and more preferably below the glass transition point of the polyphenylene sulfide resin. This is because if the dedicated mold is cooled to such a temperature, the conductivity of the fuel cell separator is improved, which contributes to the reduction of warpage and bending of the fuel cell separator.
但し、冷却温度の低下に伴い生産性が悪化するので、導電性を満足する範囲の高温で燃料電池用セパレータを脱型し、ガラス転移点以上の温度でアニーリングして燃料電池用セパレータの反りや曲がりを矯正しても良い。アニーリングは、燃料電池用セパレータを積層して０．０５ｋｇ／ｃｍ２の錘を載せることにより、実施することが好ましい。 However, since productivity deteriorates as the cooling temperature decreases, the fuel cell separator is demolded at a high temperature within the range that satisfies the conductivity, and annealing is performed at a temperature above the glass transition point to warp the fuel cell separator. You may correct the bend. Annealing is preferably carried out by stacking fuel cell separators and mounting a weight of 0.05 kg / cm 2.
製造された燃料電池用セパレータの曲げ強度は、機械的強度を確保するため、２５［ＭＰａ］以上、好ましくは２５．５［ＭＰａ］以上が良い。また、燃料電池用セパレータの曲げ弾性率は、優れた機械的特性を得る観点から、１０［ＧＰａ］以上、好ましくは１０．１［ＧＰａ］以上が良い。燃料電池用セパレータの面方向抵抗値は、電力損失抑制の観点から、２．００［ｍΩ・ｃｍ］未満、好ましくは１．９８［ｍΩ・ｃｍ］未満、より好ましくは１．９７［ｍΩ・ｃｍ］未満が良い。 The bending strength of the manufactured fuel cell separator is 25 [MPa] or more, preferably 25.5 [MPa] or more in order to secure the mechanical strength. Further, the flexural modulus of the fuel cell separator is preferably 10 [GPa] or more, preferably 10.1 [GPa] or more from the viewpoint of obtaining excellent mechanical properties. The surface resistance value of the fuel cell separator is less than 2.00 [mΩ · cm], preferably less than 1.98 [mΩ · cm], more preferably 1.97 [mΩ · cm] from the viewpoint of suppressing power loss. ] Less than is good.
上記によれば、成形材料のポリフェニレンスルフィド系樹脂に大量の黒鉛粒子を配合するので、この黒鉛粒子間が狭まって熱伝導路を形成し、燃料電池用セパレータの熱伝導率が１００［Ｗ／ｍＫ］以上となる。この熱伝導率の向上により、水の生成熱を燃料電池用セパレータの全体に拡散・伝熱することができ、薄肉化を図りながら燃料電池用セパレータの長期に亘る使用が大いに期待できる。また、黒鉛粒子の密接により、電気抵抗値を低下させ、電気伝導性を向上させることができる。 According to the above, since a large amount of graphite particles are mixed with the polyphenylene sulfide resin as the molding material, the graphite particles are narrowed to form a heat conduction path, and the thermal conductivity of the fuel cell separator is 100 [W / mK]. ] That's all. Due to this improvement in thermal conductivity, the heat generated by water can be diffused and transferred to the entire fuel cell separator, and long-term use of the fuel cell separator can be expected while reducing the wall thickness. Further, due to the close contact of the graphite particles, the electric resistance value can be lowered and the electric conductivity can be improved.
さらに、成形材料のポリフェニレンスルフィド系樹脂のメルトフローレートを１２０［ｇ／１０ｍｉｎ］以上に設定するので、ポリフェニレンスルフィド系樹脂の流動性が向上し、黒鉛粒子が密接する。この黒鉛粒子の密接により、黒鉛粒子間の空隙が狭まって熱伝導路を形成するので、燃料電池用セパレータの熱伝導率をより確実に１００［Ｗ／ｍＫ］以上にすることができる。 Further, since the melt flow rate of the polyphenylene sulfide-based resin as the molding material is set to 120 [g / 10 min] or more, the fluidity of the polyphenylene sulfide-based resin is improved and the graphite particles are brought into close contact with each other. Due to the close contact of the graphite particles, the voids between the graphite particles are narrowed to form a heat conduction path, so that the thermal conductivity of the fuel cell separator can be more reliably set to 100 [W / mK] or more.
なお、上記実施形態では黒鉛を、１種類の黒鉛粒子としたが、何らこれに限定されるものではない。例えば黒鉛を、平均粒径の異なる少なくとも２種類以上の黒鉛粒子としても良い。この場合、１種類の黒鉛粒子の平均粒径を１００μｍ以上１５０μｍ以下とし、他種類の黒鉛粒子の平均粒径を４０μｍ以上６０μｍ以下にすることができる。 In the above embodiment, graphite is one type of graphite particles, but the present invention is not limited to this. For example, graphite may be at least two or more types of graphite particles having different average particle sizes. In this case, the average particle size of one type of graphite particles can be set to 100 μm or more and 150 μm or less, and the average particle size of the other type of graphite particles can be set to 40 μm or more and 60 μm or less.
以下、本発明に係る燃料電池用セパレータの実施例を比較例と共に説明する。
〔実施例１〕
熱伝導率が１００［Ｗ／ｍＫ］以上、かつ曲げ強度が２５［ＭＰａ］以上の燃料電池用セパレータを製造するため、先ず、粉末のポリフェニレンスルフィド（ＰＰＳ）樹脂と粉末の黒鉛粒子とを用意した。
Hereinafter, examples of the fuel cell separator according to the present invention will be described together with comparative examples.
[Example 1]
In order to produce a fuel cell separator having a thermal conductivity of 100 [W / mK] or more and a bending strength of 25 [MPa] or more, first, powdered polyphenylene sulfide (PPS) resin and powdered graphite particles were prepared. ..
ポリフェニレンスルフィド樹脂としては、メルトフローレート値が４０００［ｇ／１０ｍｉｎ］のＬ４０３１（東レ株式会社製：製品名）を用いた。また、黒鉛粒子としては、平均粒径１２０μｍの８０２０ＳＪ（オリエンタル産業株式会社製：製品名）を用いた。これらの重量配合比は、１００：１８００に調整した。 As the polyphenylene sulfide resin, L4031 (manufactured by Toray Industries, Inc .: product name) having a melt flow rate value of 4000 [g / 10 min] was used. As the graphite particles, 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) having an average particle size of 120 μm was used. These weight blending ratios were adjusted to 100: 1800.
次いで、ポリフェニレンスルフィド樹脂と、黒鉛粒子とを６０Ｌタンブラーボトル〔株式会社セイワ技研製〕に多数のジルコニアボール〔株式会社ニッカトー製〕と共に加え、配合機〔株式会社セイワ技研製：製品名ＴＭ‐６０Ｐ〕により回転数３０ｒｐｍ（４０Ｈｚ）、６０分の条件で攪拌・混合し、燃料電池用セパレータの成形材料を調製した。ジルコニアボールは、φ９ｍｍサイズとφ５ｍｍサイズとをそれぞれ９ｋｇ、合計１８ｋｇ用いた。 Next, the polyphenylene sulfide resin and graphite particles were added to a 60 L tumbler bottle [manufactured by Seiwa Giken Co., Ltd.] together with a large number of zirconia balls [manufactured by Nikkato Corporation], and a compounding machine [manufactured by Seiwa Giken Co., Ltd .: product name TM-60P]. The mixture was stirred and mixed under the conditions of a rotation speed of 30 rpm (40 Hz) and 60 minutes to prepare a molding material for a separator for a fuel cell. As the zirconia balls, 9 kg each of φ9 mm size and φ5 mm size, totaling 18 kg, were used.
こうして成形材料を調製したら、離型剤〔ダイキン工業株式会社製：製品名ＧＡ‐７５００〕が予め噴霧・塗布された燃料電池用セパレータの専用金型の下型に成形材料を充填し、この成形材料をスクレーバで平らに広げてならし、下型をプッシャで軽く押圧してエアを外部に抜いた後、下型に専用金型の上型を嵌合して３００ｔのプレス機で本加熱加圧することにより、燃料電池用セパレータを圧縮成形した。
専用金型は、Ｓ４５Ｃ材により構成した。また、プレス機は、その上熱板を３８０℃、下熱板を４４０℃に設定した。本加熱加圧は、面圧４８１ｋｇ／ｃｍ２、７分間の条件で実施した。
After preparing the molding material in this way, the molding material is filled in the lower mold of the special mold for the fuel cell separator to which the mold release agent [manufactured by Daikin Industries, Ltd .: product name GA-7500] is sprayed and applied in advance, and this molding is performed. Spread the material flat with a scraper, lightly press the lower mold with a pusher to release air to the outside, then fit the upper mold of the special mold into the lower mold and heat it with a 300t press. By pressing, the fuel cell separator was compression molded.
The dedicated mold was made of S45C material. Further, in the press machine, the upper hot plate was set to 380 ° C. and the lower hot plate was set to 440 ° C. This heating and pressurization was carried out under the condition of a surface pressure of 481 kg / cm 2 for 7 minutes.
燃料電池用セパレータを圧縮成形したら、専用金型を所定の時間冷却し、専用金型から燃料電池用セパレータを脱型して燃料電池用セパレータを製造した。専用金型の冷却は、面圧４８１ｋｇ／ｃｍ２、２２分間の条件で実施した。脱型した燃料電池用セパレータは、測定したところ、２９７×２１０×４ｔｍｍの大きさであった。 After the fuel cell separator was compression-molded, the dedicated mold was cooled for a predetermined time, and the fuel cell separator was removed from the dedicated mold to manufacture the fuel cell separator. The special mold was cooled under the conditions of a surface pressure of 481 kg / cm 2 and 22 minutes. The demolded fuel cell separator was measured and found to have a size of 297 × 210 × 4 tmm.
燃料電池用セパレータを製造したら、この燃料電池用セパレータの熱伝導率、曲げ強度、曲げ弾性率、面方向抵抗値をそれぞれ測定し、表１にまとめて評価した。燃料電池用セパレータの熱伝導率は、ＡＳＴＭ Ｅ１５３０の円板熱流計法により測定した。また、燃料電池用セパレータの曲げ強度と曲げ弾性率、面方向抵抗値は、ＪＩＳ Ｋ７１７１に準拠した曲げ試験（ｎ＝５）により測定した。 After manufacturing the fuel cell separator, the thermal conductivity, bending strength, flexural modulus, and surface resistance of the fuel cell separator were measured and evaluated in Table 1. The thermal conductivity of the fuel cell separator was measured by the disc heat flow meter method of ASTM E1530. The bending strength, flexural modulus, and surface resistance of the fuel cell separator were measured by a bending test (n = 5) according to JIS K7171.
〔実施例２〕
ポリフェニレンスルフィド樹脂として、メルトフローレート値が４０００［ｇ／１０ｍｉｎ］のＬ４０３１（東レ株式会社製：製品名）を用いた。また、黒鉛粒子として、平均粒径１２０μｍの８０２０ＳＪ（オリエンタル産業株式会社製：製品名）を用いた。これらの重量配合比は、１００：２０００に調整した。
その他は実施例１と同様にして燃料電池用セパレータを製造し、製造した燃料電池用セパレータの熱伝導率、曲げ強度、曲げ弾性率、面方向抵抗値をそれぞれ測定し、表１にまとめて評価した。
[Example 2]
As the polyphenylene sulfide resin, L4031 (manufactured by Toray Industries, Inc .: product name) having a melt flow rate value of 4000 [g / 10 min] was used. Further, as the graphite particles, 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) having an average particle size of 120 μm was used. These weight blending ratios were adjusted to 100: 2000.
Other than that, a fuel cell separator was manufactured in the same manner as in Example 1, and the thermal conductivity, bending strength, flexural modulus, and surface resistance value of the manufactured fuel cell separator were measured and evaluated collectively in Table 1. did.
〔実施例３〕
ポリフェニレンスルフィド樹脂として、メルトフローレート値が４０００［ｇ／１０ｍｉｎ］のＬ４０３１（東レ株式会社製：製品名）を採用した。また、黒鉛粒子として、平均粒径１２０μｍの８０２０ＳＪ（オリエンタル産業株式会社製：製品名）を採用した。これらの重量配合比は、１００：２２００に調整した。
その他は実施例１と同様にして燃料電池用セパレータを製造し、製造した燃料電池用セパレータの熱伝導率、曲げ強度、曲げ弾性率、面方向抵抗値をそれぞれ測定し、表１にまとめて評価した。
[Example 3]
As the polyphenylene sulfide resin, L4031 (manufactured by Toray Industries, Inc .: product name) having a melt flow rate value of 4000 [g / 10 min] was adopted. Further, as the graphite particles, 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) having an average particle size of 120 μm was adopted. These weight blending ratios were adjusted to 100: 2200.
Other than that, a fuel cell separator was manufactured in the same manner as in Example 1, and the thermal conductivity, bending strength, flexural modulus, and surface resistance value of the manufactured fuel cell separator were measured and evaluated collectively in Table 1. did.
〔実施例４〕
ポリフェニレンスルフィド樹脂として、メルトフローレート値が４０００［ｇ／１０ｍｉｎ］のＬ４０３１（東レ株式会社製：製品名）を採用した。また、黒鉛粒子として、平均粒径１２０μｍの８０２０ＳＪ（オリエンタル産業株式会社製：製品名）を採用した。これらの重量配合比は、１００：２４００に調整した。
その他は実施例１と同様にして燃料電池用セパレータを製造し、製造した燃料電池用セパレータの熱伝導率、曲げ強度、曲げ弾性率、面方向抵抗値をそれぞれ測定し、表１にまとめて評価した。
[Example 4]
As the polyphenylene sulfide resin, L4031 (manufactured by Toray Industries, Inc .: product name) having a melt flow rate value of 4000 [g / 10 min] was adopted. Further, as the graphite particles, 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) having an average particle size of 120 μm was adopted. These weight blending ratios were adjusted to 100: 2400.
Other than that, a fuel cell separator was manufactured in the same manner as in Example 1, and the thermal conductivity, bending strength, flexural modulus, and surface resistance value of the manufactured fuel cell separator were measured and evaluated collectively in Table 1. did.
〔比較例〕
燃料電池用セパレータを製造するため、粉末のポリフェニレンスルフィド樹脂と、粉末の黒鉛粒子とを用意した。ポリフェニレンスルフィド樹脂としては、メルトフローレート値が６００［ｇ／１０ｍｉｎ］のＭ２８８８（東レ株式会社製：製品名）を用いた。また、黒鉛粒子として、平均粒径１２０μｍの８０２０ＳＪ（オリエンタル産業株式会社製：製品名）を採用した。これらの重量配合比は、１００：１６００に設定した。
[Comparative example]
In order to manufacture a separator for a fuel cell, powdered polyphenylene sulfide resin and powdered graphite particles were prepared. As the polyphenylene sulfide resin, M2888 (manufactured by Toray Industries, Inc .: product name) having a melt flow rate value of 600 [g / 10 min] was used. Further, as the graphite particles, 8020SJ (manufactured by Oriental Sangyo Co., Ltd .: product name) having an average particle size of 120 μm was adopted. These weight blending ratios were set to 100: 1600.
次いで、ポリフェニレンスルフィド樹脂と黒鉛粒子とを６０Ｌタンブラーボトル〔株式会社セイワ技研製〕に多数のジルコニアボール〔株式会社ニッカトー製〕と共に加え、配合機〔株式会社セイワ技研製：製品名ＴＭ‐６０Ｐ〕により回転数３０ｒｐｍ（４０Ｈｚ）、６０分の条件で攪拌・混合し、燃料電池用セパレータの成形材料を調製した。ジルコニアボールは、φ９ｍｍサイズとφ５ｍｍサイズとをそれぞれ９ｋｇ、合計１８ｋｇ用いた。 Next, the polyphenylene sulfide resin and graphite particles were added to a 60 L tumbler bottle [manufactured by Seiwa Giken Co., Ltd.] together with a large number of zirconia balls [manufactured by Nikkato Corporation], and the compounding machine [manufactured by Seiwa Giken Co., Ltd .: product name TM-60P] was used. Stirring and mixing were performed under the conditions of a rotation speed of 30 rpm (40 Hz) and 60 minutes to prepare a molding material for a separator for a fuel cell. As the zirconia balls, 9 kg each of φ9 mm size and φ5 mm size, totaling 18 kg, were used.
その他は実施例１と同様にして燃料電池用セパレータを製造し、この製造した燃料電池用セパレータの熱伝導率、曲げ強度、曲げ弾性率、面方向抵抗値をそれぞれ測定し、表１にまとめて評価した。 Other than that, a fuel cell separator was manufactured in the same manner as in Example 1, and the thermal conductivity, bending strength, flexural modulus, and surface resistance value of the manufactured fuel cell separator were measured and summarized in Table 1. evaluated.
各実施例における燃料電池用セパレータは、ポリフェニレンスルフィド系樹脂と黒鉛との重量配合比が１００：１７００〜２５００なので、熱伝導率が１００［Ｗ／ｍＫ］以上となり、きわめて良好な結果を得た。また、燃料電池用セパレータの曲げ強度が２５［ＭＰａ］以上、面方向抵抗値が１．９６［ｍΩ・ｃｍ］以下となり、良好な結果を得た。さらに、水素や酸素の気体透過性についても測定したが、優れた結果を得ることができた。 Since the weight blending ratio of the polyphenylene sulfide resin and graphite of the fuel cell separator in each example was 100: 1700 to 2500, the thermal conductivity was 100 [W / mK] or more, and extremely good results were obtained. Further, the bending strength of the fuel cell separator was 25 [MPa] or more, and the surface resistance value was 1.96 [mΩ · cm] or less, and good results were obtained. Furthermore, the gas permeability of hydrogen and oxygen was also measured, and excellent results were obtained.
これに対し、比較例における燃料電池用セパレータは、曲げ強度や曲げ弾性率こそ良好であったが、ポリフェニレンスルフィド樹脂と黒鉛粒子の重量配合比が１００：１６００なので、熱伝導率が１００［Ｗ／ｍＫ］未満の７８．５［Ｗ／ｍＫ］となり、満足する結果を得ることができなかった。 On the other hand, the fuel cell separator in the comparative example had good bending strength and flexural modulus, but the weight compounding ratio of the polyphenylene sulfide resin and the graphite particles was 100: 1600, so the thermal conductivity was 100 [W / W / It was 78.5 [W / mK], which was less than mK], and a satisfactory result could not be obtained.
本発明に係る燃料電池用セパレータは、燃料電池の製造分野で使用される。 The fuel cell separator according to the present invention is used in the field of fuel cell manufacturing.
Claims (4)
成形材料の熱可塑性樹脂がポリフェニレンスルフィド系樹脂とされるとともに、導電材が黒鉛とされ、これらポリフェニレンスルフィド系樹脂と黒鉛とが重量配合比１００：１７００〜２５００で混合されることにより、熱伝導率が１００［Ｗ／ｍＫ］以上とされることを特徴とする燃料電池用セパレータ。 A fuel cell separator that is molded from a molding material containing a thermoplastic resin and a conductive material and has a flow path for fuel and an oxidizing agent.
The thermoplastic resin of the molding material is a polyphenylene sulfide resin, the conductive material is graphite, and these polyphenylene sulfide resins and graphite are mixed at a weight blending ratio of 100: 1700 to 2500 to achieve thermal conductivity. A separator for a fuel cell, characterized in that the value is 100 [W / mK] or more.
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