成果報告書詳細
管理番号20110000000537
タイトル*平成22年度中間年報 水素先端科学基礎研究事業 水素先端科学基礎研究 水素に対して耐性に優れた適用材料の研究開発
公開日2011/6/7
報告書年度2010 - 2010
委託先名日本合成化学工業株式会社
プロジェクト番号P06026
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 付帯条件 70MPa水素中でのガスバリア性を評価し、2015年水素ステーション機器への応用可能性を初年度中に明確にすること。 1.研究開発の内容及び成果等 本研究開発は、「70MPa水素耐性を有するガスバリア材の最適化検討と2015年水素ステーション機器への応用可能性の初年度中での明確化」と平成23年度~平成24年度における「高機能化高圧水素ガス多層樹脂配管、高圧水素ガス多層樹脂ホースの耐久性材料の設計指針の策定」からなる。
英文要約To utilize the hydrogen for vehicles, flexible high-pressure hose is one of the key components that need to be developed for hydrogen supply system. Fiber-reinforced nylon is used as a main material for flexible high-pressure hose, however we consider that a large deformation of the nylon occurs by the absorption of a large amount of hydrogen gas, and consequently durability of the hose is deteriorated. We presume that we can prevent this large deformation of nylon by placing the high hydrogen gas barrier layer at the inner layer of flexible high-pressure hose. Therefore, we have started to develop the hydrogen barrier resin for laminating with nylon to improve the durability of the flexible high-pressure hose. The main content of study is summarized as follows.
(1) Preparation of the hydrogen gas barrier resin.  
We prepared several gas barrier resins based on PVA derivative that has the best barrier property in polymer. We prepared amorphous polyvinyl alcohol which has the T1C (13C spin-lattice relaxation time) of a long time component in amorphous phase. Crystallinity is controlled by quantity of T1c relaxation time of a long time component in amorphous phase. As a result, moldability and good gas barrier property of amorphous polyvinyl alcohol was found to be compatible. In addition, we prepared the gas barrier resin by blending a soft component to improve the flexibility.
(2) Hydrogen permeation test
We conducted hydrogen permeation test of the gas barrier resin under the following test condition.
*Pressure of hydrogen gas: 0.5MPa, 0.9MPa.
*Test temperature: 40 degrees C, 60 degrees C.
We confirmed that hydrogen permeability coefficient of amorphous polyvinyl alcohol etc. is independent of pressure, but depends on temperature. We found that hydrogen permeability coefficient of nylon 11 is 10000 times higher than that of amorphous polyvinyl alcohol. That is, the hydrogen barrier property of amorphous polyvinyl alcohol was significantly superior to that of nylon11.
(3) Hydrogen exposure test of the gas barrier resin under 70MPa high-pressure for 400hrs.
We conducted exposure test of the gas barrier resin under 70MPa high-pressure to verify whether it is possible to extrapolate the hydrogen gas barrier property under high-pressure. Even after amorphous polyvinyl alcohol and its polymer alloy was exposed to 70MPa high-pressure, we did not confirm any mechanical changes. However, T1C relaxation time of each time component in amorphous phase showed a tendency of getting shorter. We considered that amount of hydrogen bond in amorphous phase slightly decreased. Because the fraction of T1C relaxation time of each time component in amorphous phase of amorphous polyvinyl alcohol was almost the same regarding before and after the exposure test, we consider that influence on the hydrogen gas barrier is in negligible level. We have a plan to investigate the influence through evaluation of hydrogen dissolution amount under high-pressure next year.
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