成果報告書詳細
管理番号20140000000120
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 水素ステーションの高圧水素用ホースとシールシステムに関する研究開発(4)
公開日2015/4/25
報告書年度2013 - 2013
委託先名国立大学法人九州大学
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title:Research and Development of Technology for Hydrogen Utilization/Research and Development of Low-cost Equipment and System for Fuel CellVehicles and Hydrogen Stations/Research and Development of Low-cost Equipment, System and their Materials for Hydrogen Stations/Research and Development of High-pressure Hydrogen Hose and Sealing System for Hydrogen Stations.(FY2013-FY2015) FY2013 Annual Report.

In order to develop the resin hose for 82 MPa hydrogen gas, we examined hydrogen content and volume change after high-pressure hydrogen exposure for candidate resin materials. We examined hydrogen content and volume change for high-density polyethylene, polytetrafluoroethylene, ethylene-vinyl alcohol copolymer and polyamides (PA) after hydrogen exposure at 30, 50, 70, 90 MPa. A series of PA resins, PA6, PA66 and PA11 showed similar values at each exposure pressure. The volume increase ratios of these materials were proportional to their hydrogen content. The volume of these materials did not recover their original volume even after 600 hours. According to the discussion at the research group of elastomers for hydrogen equipment, the society of rubber science ant technology, Japan, we have selected 20 candidate materials for hoses, type 4 tank liners and hydrogen equipment, such as polyolefins, a series of PA, poly(vinyl alcohols, fluorine-containing polymers and some engineering plastics.
We expanded the scope of model compounds for rubber seals on the database, which have established by "Fundamental Research Project on Advanced Hydrogen Science (2006-2012)". We discussed and decided to focus the practical model compound as the hydrogen seals. We have categorized these materials for high-temperature (-20°C ~ 180°C) seal, middle-temperature (-20°C ~ 50°C) seal and low temperature (-40°C ~ 50°C) seal. We selected ethylene-propylene rubber (EPDM) for low temperature seal, NBR-90 and HNBR-90 of JIS B2401-1 for middle temperature seal, fluorine-containing rubber (FKM) for high-temperature seal on the database. Silicone rubber (Q) is considered to be able to cover all temperature-region in the hydrogen station.
Friction and wear behaviors of 8 types of polymer sealing materials were examined in the high-pressure hydrogen atmosphere with a gas pressure of 40 MPa and a gas temperature of 100°C. We also performed friction experiments between a rubber ball and a disk in hydrogen or other environments as a fundamental study on friction of O-ring seals. We found that a crack-like damage was observed at the early stage of sliding.
We discussed about the evaluation method and criteria of physical properties of materials for reliable resin hoses. We concluded that hydrogen content, volume change and blister level of the materials after high-pressure hydrogen exposure are important. We applied the acoustic emission method for detecting the blister quantitatively. In order to compare these hydrogen properties and physical properties in the air measured by the standard methods, we prepare model materials for practical measurements.
In order to clarify the effects of friction and deformation of rubber O-ring seals on the seal property during pressurization, we established the visualization system for the O-ring seal. We found the existence of a critical pressure and of a slow preparation stage at inflation of rubber O-ring in the vessel.
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