成果報告書詳細
管理番号20150000000211
タイトル*平成26年度中間年報 水素利用技術研究開発事  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 (九州大学)
公開日2015/12/19
報告書年度2014 - 2014
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) FY2015Annual 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. According to the discussion at the research group of elastomers for hydrogen equipment, the society of rubber science ant technology, Japan, we have selected 21 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 examined hydrogen content and volume change for 21 kinds of resins, such as high-density polyethylene, polytetrafluoroethylene, ethylene-vinyl alcohol copolymer and polyamides (PA) after hydrogen exposure at 30, 50, 70, 90 MPa. Hydrogen contents of a series of PA resins, PA6, PA66 and PA11 were proportional to their amide group density.
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. We examined the hydrogen content and volume change after 30, 50, 90MPa hydrogen exposure for NBR-90 and HNBR-90 of JIS B2401-1 manufactured by 10 rubber companies. According to the results, these rubber samples showed wide range of hydrogen content and volume change values, nevertheless they showed similar mechanical properties.
In order to measure friction and wear behaviors in highly controlled atmosphere at low temperature, we developed the friction and wear measurement system equipped with chiller. According to the results of PTFE filled with carbon fiber and stainless steel, specific wear rate and friction coefficient in -30°C hydrogen are smaller than in room temperature hydrogen atmosphere.
We discussed about the evaluation method and criteria of physical properties of materials for reliable resin hoses. In order to evaluate the environmental stress cracking of the resin materials, we concluded that hydrogen exposure experiment of the bending test pieces at -40°C. We confirmed the environmental stress cracking in polyamide resins after 90MPa hydrogen exposure at -40°C.
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 equipped with pressure gauge. We tried to understand that the deformation process of rubber O-ring in the vessel.
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