WO2017170189A1 - ゴム組成物およびそれを用いた高圧水素機器用シール部品 - Google Patents
ゴム組成物およびそれを用いた高圧水素機器用シール部品 Download PDFInfo
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- WO2017170189A1 WO2017170189A1 PCT/JP2017/011919 JP2017011919W WO2017170189A1 WO 2017170189 A1 WO2017170189 A1 WO 2017170189A1 JP 2017011919 W JP2017011919 W JP 2017011919W WO 2017170189 A1 WO2017170189 A1 WO 2017170189A1
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- rubber composition
- pressure hydrogen
- ebenb
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- hydrogen gas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/04—Monomers containing three or four carbon atoms
- C08F210/08—Butenes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F210/18—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers with non-conjugated dienes, e.g. EPT rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/045—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated conjugated hydrocarbons other than butadiene or isoprene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
- F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0642—Copolymers containing at least three different monomers
Definitions
- the present invention relates to a rubber composition and a seal part for high-pressure hydrogen equipment using the rubber composition. More specifically, the present invention relates to a rubber composition suitable for producing a seal part for high-pressure hydrogen equipment used in a low temperature environment (for example, about ⁇ 40 ° C. to ⁇ 60 ° C.).
- the target time for filling high-pressure hydrogen gas is set to about 3 minutes, which is the same as that of a gasoline vehicle, it is necessary to rapidly fill the on-vehicle high-pressure tank with hydrogen gas.
- the temperature rise of the high-pressure tank becomes a problem. Therefore, in order to suppress the temperature rise of the on-vehicle high-pressure tank, it is common to use low-temperature hydrogen gas that has been cooled to about ⁇ 40 ° C. in advance.
- a sealing part that can seal high-pressure hydrogen gas at ⁇ 40 ° C. is indispensable. Further, when it is assumed that the fuel cell vehicle is used in an extremely cold region, a sealing function can be achieved even at ⁇ 50 ° C. There is a demand for seal parts that can perform.
- NBR nitrile rubber
- FKM fluorine rubber
- IIR butyl rubber
- EPDM ethylene / propylene / diene terpolymer
- the sealing parts for high-pressure hydrogen equipment are required to further improve the characteristics, and in particular, the improvement of blister resistance is desired.
- the blister resistance of the seal part for high-pressure hydrogen equipment means a characteristic that blisters (such as cracks and foam) are not formed when the seal part comes into contact with high-pressure hydrogen. Such blister formation is undesirable because it causes rubber breakage.
- Non-Patent Document 1 When sealing parts come into contact with high-pressure hydrogen gas, some hydrogen gas permeates through them, but if hydrogen gas diffuses quickly in the sealing parts (the diffusion coefficient is large), rubber breakage occurs. Hateful.
- the present invention has an object to provide a rubber composition suitable for producing a seal part for high-pressure hydrogen equipment that is excellent in low-temperature sealability and blister resistance, and a seal part for high-pressure hydrogen equipment using the rubber composition.
- the present inventors have focused on the fact that the ethylene / butene / ethylidene norbornene terpolymer (EBENB) has an excellent low temperature sealing property, and uses EBENB instead of the conventional EPDM.
- EBENB ethylene / butene / ethylidene norbornene terpolymer
- the gist configuration of the present invention is as follows.
- a rubber composition comprising an ethylene / butene / ethylidenenorbornene terpolymer (EBENB), A rubber composition used for producing seal parts for high-pressure hydrogen equipment.
- EBENB ethylene / butene / ethylidenenorbornene terpolymer
- the rubber composition according to the above [1] wherein the ethylene / butene / ethylidene norbornene terpolymer (EBENB) has an iodine value of 3 to 20.
- EBENB ethylene / butene / ethylidene norbornene terpolymer
- a seal part for high-pressure hydrogen equipment which is a product obtained by vulcanizing and molding the rubber composition according to any one of [1] to [3],
- the TR10 value measured in the low temperature elastic recovery test specified in JIS K6261: 2006 is ⁇ 50 ° C. or lower
- the rubber composition according to the present embodiment contains an ethylene / butene / ethylidene norbornene terpolymer (EBENB). Moreover, it is preferable that a rubber composition further contains a filler, a crosslinking agent, and a processing aid. Moreover, you may contain various compounding agents as needed.
- EBENB ethylene / butene / ethylidene norbornene terpolymer
- EPDM has been widely used as a material having a low-temperature sealing property.
- rubber compositions using EPDM are from the viewpoint of material cost and processability compared to rubber compositions using other rubber materials.
- the production cost tended to be high. Therefore, the present inventor focused on EBENB, which has excellent cold resistance and excellent flexibility, and proceeded with studies.
- EBENB which has excellent cold resistance and excellent flexibility, and proceeded with studies.
- the seal part for high-pressure hydrogen equipment obtained by using EBENB uses EPDM, Compared to the above, it was found that the low-temperature sealing property was equal to or more than that, and the processability as a rubber composition was excellent due to its flexibility. Furthermore, it was found that the seal part for high-pressure hydrogen equipment obtained by using EBENB has particularly fast diffusion of hydrogen gas (high diffusion coefficient of hydrogen gas) and excellent blister resistance.
- the rubber composition according to the present invention completed through the above-described studies, the rubber composition has desired sealing characteristics required as a seal part for high-pressure hydrogen equipment, and particularly has excellent low-temperature sealability and blister resistance.
- a seal part for high-pressure hydrogen equipment having both can be manufactured.
- EBENB any of ethylene and butene obtained by copolymerizing a small amount of various ethylidene norbornene components can be used, and actually various commercially available EBENBs can be used as they are.
- the iodine value (g / 100 g) of EBENB is preferably 3 to 20, and more preferably 5 to 18. By setting it as the above range, a stable molecular state can be maintained even in a low temperature environment, low temperature sealing property can be improved, and mechanical strength is also improved, so that blister resistance can also be improved.
- EBENB has a smaller polymer viscosity expressed by Mooney viscosity (ML 1 + 4 , 100 ° C.) than EPDM, and it can be said that EBENB is excellent in terms of workability (for example, kneadability and moldability). Therefore, by using EBENB instead of EPDM, productivity such as molding efficiency is improved, which leads to reduction in production cost.
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) of such EBENB is preferably 10 to 45, more preferably 15 to 25. If this Mooney viscosity is too low, the compression set may increase and the tensile strength may decrease. On the other hand, when the Mooney viscosity is too high, the characteristics are improved, but the processability may be inferior.
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) can be determined according to JIS K6300-1: 2013.
- the content of the ethylene component in EBENB is preferably 60 to 80% by mass, and more preferably 65 to 75% by mass. By setting it as the said range, the glass transition temperature of EBENB shows the minimum value, and cold resistance improves.
- the content of EBENB is preferably 1 to 100 parts by weight, more preferably 50 to 100 parts by weight, and still more preferably 70 to 100 parts by weight in the rubber composition according to this embodiment. . By making the content of EBENB within the above range, improvement in workability and productivity can be expected.
- filler conventionally known fillers can be used. Specifically, inorganic fillers such as carbon black, silicic acid, silicate, calcium carbonate, magnesium carbonate, clay, talc, bentonite, sericite, mica, calcium silicate, alumina hydrate, barium sulfate, and polyethylene resin And organic fillers such as polypropylene resin, styrene resin, coumarone-indene resin, melamine resin, phenol resin, and cork powder, which can be used alone or in combination. Among these, carbon black is preferable as the filler.
- inorganic fillers such as carbon black, silicic acid, silicate, calcium carbonate, magnesium carbonate, clay, talc, bentonite, sericite, mica, calcium silicate, alumina hydrate, barium sulfate, and polyethylene resin
- organic fillers such as polypropylene resin, styrene resin, coumarone-indene resin, melamine resin, phenol resin, and
- the blending amount of the filler is preferably 0.1 to 300 parts by weight with respect to 100 parts by weight of EBENB, but depending on the type of the filler, it may be blended even outside the above range. What is necessary is just to determine the kind and compounding quantity of these fillers arbitrarily according to the objective.
- organic peroxides are mainly preferred.
- Organic peroxides include t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di-t-butylperoxyhexane, 2,5-dimethyl-2,5-di-t.
- the blending amount of the crosslinking agent is preferably 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight with respect to 100 parts by weight of EBENB.
- a master batch containing the organic peroxide as described above for example, DCP30ZP03K (manufactured by Nippon Zeon Co., Ltd .; dicumyl peroxide 30% by mass, Zetpol 2010L 30% by mass, SRF carbon black 40% by mass) or the like is used. You can also.
- Such a masterbatch is preferable in that kneadability and dispersibility can be improved when preparing a rubber composition.
- a crosslinking accelerator may be contained as necessary.
- the crosslinking accelerator triallyl isocyanurate (TAIC), triallyl cyanate (TAC), liquid polybutadiene, N, N′-m-phenylene dimaleimide, trimethylolpropane trimethacrylate, or the like can be used.
- TAIC triallyl isocyanurate
- TAC triallyl cyanate
- liquid polybutadiene N, N′-m-phenylene dimaleimide, trimethylolpropane trimethacrylate, or the like
- the crosslinking efficiency can be improved, and the heat resistance and mechanical properties can be improved. Therefore, the stability as a seal part can also be improved.
- processing aids include process oils mainly composed of aliphatic hydrocarbons, such as Idemitsu Kosan Co., Ltd. products PW380 and PW220, which can be used alone or in combination.
- process oil is more preferable in that it has a lower molecular weight than paraffin wax having a similar chemical structure, and therefore exhibits a specific effect that cannot be achieved when paraffin wax is blended.
- the blending amount of the processing aid is preferably 1 to 20 parts by weight, more preferably 3 to 15 parts by weight with respect to 100 parts by weight of EBENB. By setting it in the above range, kneading workability is improved and oil bleeding can be prevented.
- a compounding agent generally used in the rubber industry such as an acid acceptor and an antioxidant is used as necessary. May be used as appropriate.
- the compounding amount of the rubber compounding agent is preferably 300 parts by weight or less with respect to 100 parts by weight of EBENB.
- the rubber composition can be prepared by kneading various materials using a kneader such as a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, a kneader, or a high shear mixer.
- a kneader such as a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, a kneader, or a high shear mixer.
- the vulcanization of the rubber composition can be generally performed by pressure vulcanization at about 150 to 230 ° C. for about 0.5 to 30 minutes using an injection molding machine, a compression molding machine or the like.
- secondary vulcanization may be performed as necessary in order to reliably vulcanize the vulcanized product.
- Secondary vulcanization can generally be performed by oven heating at about 150-250 ° C. for about 0.5-24 hours.
- the one obtained by vulcanization molding of the rubber composition according to the present invention (molded product) is suitable as a seal part for high-pressure hydrogen equipment.
- the high-pressure hydrogen equipment include containers and pipes used when filling or transporting high-pressure hydrogen gas, such as an on-vehicle tank of a fuel cell vehicle, a hydrogen station, and various hydrogen gas tanks.
- the above-mentioned sealing parts for high-pressure hydrogen equipment are parts used for sealing (sealing) hydrogen gas in the high-pressure hydrogen equipment.
- Seal parts for high-pressure hydrogen equipment exhibit excellent sealing performance even in a low-temperature environment (for example, about ⁇ 40 to 60 ° C.), and are particularly suitable when used in an environment of ⁇ 50 ° C. or less.
- Such a high-pressure hydrogen equipment seal part preferably has a TR10 value of ⁇ 50 ° C. or lower as measured in a low-temperature elastic recovery test specified in JIS K6261: 2006, for example.
- the sealing part for high-pressure hydrogen equipment as described above preferably diffuses hydrogen gas quickly.
- the diffusion coefficient of hydrogen gas is preferably 5 ⁇ 10 ⁇ 6 cm 2 / s or more.
- the shape of the seal part for high-pressure hydrogen equipment is not particularly limited, and can be various shapes depending on the application. Examples thereof include shapes such as O-rings, packings, and sheets.
- Example 1 In Example 1, 70 parts by weight of carbon black, 3 parts by weight of a peroxide crosslinking agent, 5 parts by weight of zinc oxide, and 1 part of stearic acid with respect to 100 parts by weight of EBENB (experimental synthetic product) having an iodine value of 16 A rubber composition was obtained by blending appropriate amounts of parts by weight and, if necessary, processing aids and antioxidants, and kneading them with a kneader and an open roll.
- Example 2 a rubber composition was obtained in the same manner as in Example 1 except that EBENB (experimental synthetic product) having an iodine value of 10 was used.
- Example 3 a rubber composition was obtained in the same manner as in Example 1 except that EBENB (experimental synthetic product) having an iodine value of 5 was used.
- Comparative Example 1 a rubber composition was obtained in the same manner as in Example 1 except that EPDM (experimental synthetic product) having an iodine value of 16 was used.
- Comparative Example 2 In Comparative Example 2, a rubber composition was obtained in the same manner as in Example 1 except that EPDM (experimental synthetic product) having an iodine value of 26 was used.
- the temperature difference between these temperatures indicates that the smaller the value, the more elastic recovery is realized in a narrower temperature range.
- Such a material may exhibit a preferable sealing behavior from the viewpoint of rubber elasticity. Recognize. In this example, particularly when TR10 was ⁇ 50 ° C. or lower, it was evaluated that the low temperature sealing property was good.
- the permeation coefficient of hydrogen gas is an index representing the ease of permeation when hydrogen gas permeates the rubber material, and the larger the value, the more the rubber material permeates more hydrogen.
- the diffusion coefficient of hydrogen gas is an index indicating the ease of diffusion when hydrogen gas diffuses into the rubber material. The larger the value, the easier the hydrogen gas diffuses into the rubber material. ing. In this example, particularly when the diffusion coefficient of hydrogen gas was 5 ⁇ 10 ⁇ 6 cm 2 / s or more, it was evaluated that the blister resistance was good.
- the molded article using the rubber composition according to Examples 1 to 3 including EBENB has a TR10 higher than the molded article of the rubber composition according to Comparative Examples 1 and 2 using EPDM instead of EBENB. Since it was a low temperature, it was confirmed that it was excellent in low temperature sealability.
- the molded article using the rubber composition according to Examples 1 to 3 including EBENB has the same compression set as the molded article of the rubber composition according to Comparative Examples 1 and 2 using EPDM. It was confirmed that it has sufficient heat resistance (seal life).
- the molded article using the rubber composition according to Examples 1 to 3 including EBENB has the same hydrogen gas permeability coefficient as the molded article of the rubber composition according to Comparative Examples 1 and 2 using EPDM. From this, it was confirmed that it has an equivalent gas barrier property.
- the molded article using the rubber composition according to Examples 1 to 3 including EBENB has a larger hydrogen gas permeability coefficient than the molded article of the rubber composition according to Comparative Examples 1 and 2 using EPDM. From this, it was confirmed that hydrogen gas diffused quickly.
- the rubber composition containing EBENB according to the present invention is particularly suitable for producing a seal part for high-pressure hydrogen equipment having excellent low-temperature sealability and blister resistance.
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Abstract
Description
[1] エチレン・ブテン・エチリデンノルボルネン3元共重合体(EBENB)を含むゴム組成物であって、
高圧水素機器用シール部品を製造するために用いられる、ゴム組成物。
[2] 前記エチレン・ブテン・エチリデンノルボルネン3元共重合体(EBENB)のヨウ素価が、3~20である、上記[1]に記載のゴム組成物。
[3] 前記高圧水素機器用シール部品が、-50℃での低温シール性を有する、上記[1]または[2]に記載のゴム組成物。
[4] 上記[1]~[3]のいずれか1項に記載のゴム組成物を加硫成形した物である高圧水素機器用シール部品であって、
JIS K6261:2006に規定されている低温弾性回復試験で測定したTR10の値が、-50℃以下であり、
水素ガスの拡散係数が、5×10-6cm2/s以上である、高圧水素機器用シール部品。
実施例1では、ヨウ素価16のEBENB(実験合成品)100重量部に対して、カーボンブラックを70重量部、過酸化物架橋剤を3重量部、酸化亜鉛を5重量部、ステアリン酸を1重量部、さらに必要に応じて加工助剤および酸化防止剤を適量配合し、これらをニーダーおよびオープンロールにて混練して、ゴム組成物を得た。
実施例2では、ヨウ素価10のEBENB(実験合成品)を用いた以外は、実施例1と同様の方法で、ゴム組成物を得た。
実施例3では、ヨウ素価5のEBENB(実験合成品)を用いた以外は、実施例1と同様の方法で、ゴム組成物を得た。
比較例1では、ヨウ素価16のEPDM(実験合成品)を用いた以外は、実施例1と同様の方法で、ゴム組成物を得た。
比較例2では、ヨウ素価26のEPDM(実験合成品)を用いた以外は、実施例1と同様の方法で、ゴム組成物を得た。
上記実施例および比較例に係るゴム組成物を用いて、下記に示す特性評価を行った。各特性の評価条件は下記の通りである。結果を表1に示す。
上記ゴム組成物について、シート金型を用いて、180℃、8分間の加圧加硫(一次加硫)および180℃、24時間のオープン加硫(二次加硫)を行い、厚さ2mmの板状加硫ゴムを成型した。
得られた板状加硫ゴムについて、JIS K6261:2006に従って、TR-10およびTR70を測定した。TR10およびTR70は、試験片を50%伸張して凍結させた後、これを昇温して弾性率を回復する際に、収縮率がそれぞれ10%および70%になる温度である。TR10およびTR70の各温度は、低いほど、低温でゴム弾性が回復していることを示しており、ゴム弾性によりシール性を付与するシール部品においては、これらの温度がより低いことが望ましい。また、これらの温度の温度差は、値が小さいほど、弾性の回復がより狭い温度範囲で実現することを示しており、このような材料は、ゴム弾性の観点から好ましいシール挙動を示すことがわかる。
なお、本実施例では、特にTR10が-50℃以下である場合を低温シール性が良好であると評価した。
上記ゴム組成物について、Oリング金型を用いて、180℃、10分間の加圧加硫(一次加硫)および150℃、24時間のオープン加硫(二次加硫)を行い、JIS B2401-1:2012 G25で規定するOリングを得た。
得られたOリングについて、JIS K6262:2006に従って、圧縮率25%、試験温度150℃、試験時間70時間の耐熱老化後の、圧縮永久ひずみ(%)を測定した。Oリングの圧縮永久ひずみは、その値が小さいほど、Oリングのシール性がよく、シール寿命が長いことを意味する。
上記ゴム組成物について、シート金型を用いて、180℃、8分間の加圧加硫(一次加硫)および150℃、24時間のオープン加硫(二次加硫)を行い、厚さ0.5mmの板状加硫ゴムを成型した。
次に、得られた板状加硫ゴムについて、JIS K6275-1:2009に準拠し、30℃、0.6MPaにおける、水素ガスの透過係数およびガスの拡散係数を算出した。水素ガスの透過係数は、水素ガスがゴム材料を透過する際の透過のし易さを表す指標であり、その値が大きいほど、ゴム材料はより多くの水素を透過させることを示している。また、水素ガスの拡散係数は、水素ガスがゴム材料中に拡散する際の拡散のし易さを表す指標であり、その値が大きいほど、ゴム材料中に水素ガスが拡散し易いことを示している。
なお、本実施例では、特に水素ガスの拡散係数が、5×10-6cm2/s以上である場合を耐ブリスタ性が良好であると評価した。
上記ゴム組成物について、Oリング金型を用いて、180℃、10分間の加圧加硫(一次加硫)および150℃、24時間のオープン加硫(二次加硫)を行い、JIS B2401-1:2012 G25で規定するOリングを得た。
得られたOリングを用い圧力容器に、高圧水素ガスを充填し、90MPaまで昇圧して、一定時間保持し、その後0.6MPaに減圧して、さらに一定時間保持し、この加圧と減圧の圧力サイクル(1サイクル6秒間)を5,500回実施し(30℃にて)、サイクル中に顕著なリークが発生しないことを確認した。リークが発生しなかったものは、シール耐久性に優れていることを意味する。
Claims (4)
- エチレン・ブテン・エチリデンノルボルネン3元共重合体(EBENB)を含むゴム組成物であって、
高圧水素機器用シール部品を製造するために用いられる、ゴム組成物。 - 前記エチレン・ブテン・エチリデンノルボルネン3元共重合体のヨウ素価が、3~20である、請求項1に記載のゴム組成物。
- 前記高圧水素機器用シール部品が、-50℃での低温シール性を有する、請求項1または2に記載のゴム組成物。
- 請求項1~3のいずれか1項に記載のゴム組成物を加硫成形した物である水素機器用シール部品であって、
JIS K6261:2006に規定されている低温弾性回復試験で測定したTR10の値が、-50℃以下であり、
水素ガスの拡散係数が、5×10-6cm2/s以上である、高圧水素機器用シール部品。
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EP17774726.8A EP3409742B1 (en) | 2016-03-28 | 2017-03-24 | Rubber composition and high-pressure hydrogen instrument seal component using same |
JP2017529847A JP6210442B1 (ja) | 2016-03-28 | 2017-03-24 | ゴム組成物およびそれを用いた高圧水素機器用シール部品 |
KR1020187026255A KR102134360B1 (ko) | 2016-03-28 | 2017-03-24 | 고무 조성물 및 그것을 이용한 고압 수소 기기용 밀봉 부품 |
CN201780013749.1A CN108699424A (zh) | 2016-03-28 | 2017-03-24 | 橡胶组合物及使用该橡胶组合物的高压氢设备用密封部件 |
US16/106,398 US10815407B2 (en) | 2016-03-28 | 2018-08-21 | Rubber composition and sealing part for high pressure hydrogen apparatus using same |
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EP3409742A1 (en) | 2018-12-05 |
US20180355232A1 (en) | 2018-12-13 |
KR102134360B1 (ko) | 2020-07-16 |
EP3409742A4 (en) | 2019-10-23 |
EP3409742B1 (en) | 2024-05-01 |
KR20180107256A (ko) | 2018-10-01 |
JP6210442B1 (ja) | 2017-10-11 |
US10815407B2 (en) | 2020-10-27 |
CN108699424A (zh) | 2018-10-23 |
JPWO2017170189A1 (ja) | 2018-04-05 |
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