成果報告書詳細
管理番号20160000000401
タイトル*平成27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 (国立大学法人九州大学)
公開日2016/8/26
報告書年度2015 - 2015
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 Cell Vehicles 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-FY2017) 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 22 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. The results show the hydrogen contents after hydrogen exposure of olefininc polymers, such as polyethylene or olephinic polyamide were about 1000wt.ppm and those of aromatic polymers were higher than olefinic polymers.
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. The ethylene-propylene rubber (EPDM), which is candidate for low temperature seal, was examined by quality engineering method. The results show that plasticizer and its content were sensitive for low temperature seal. No sensitive parameter was found for hydrogen content after high-pressure hydrogen content, however, plasticizer and its content were sensitive parameter for volume change after hydrogen exposure. We discussed about the design guideline for low temperature hydrogen seal rubber materials. We also examined the hydrogen content and volume change after 30, 50, 90MPa hydrogen exposure for NBR-90 of JIS B2401-1 manufactured by 10 rubber companies. According to the results, there are no obvious relationship between the hydrogen penetration properties of NBR-90 and its mechanical properties.
Friction and wear properties of PTFE-based and PEEK-based polymer composites in low temperature hydrogen were obtained. Sealing capability of these materials are also investigated.
We establish the evaluation protocol of high-pressure hydrogen hose. 12 seconds to 90 MPa and keep 5 seconds at 90MPa, then decompress to 0.1 MPa for 4 seconds and keep 5 seconds, at -40°C. We examined 4 types of hoses, which has different inner layers, in terms of this protocol. Three types of hoses showed larger than 20,000 times cycle durability, however 1 hose leaked at around 6,000 cycle. The protocol can be evaluate pressurization decompression cycle durability of high-pressure hydrogen hoses. We establish residual stress in the inner layer of hoses after test by photoelasticity method.
Shear stress at start of tangential motion and surface failure under reciprocal motion of rubbers for O-rings are studied in various gas environments. Dependence of deformation of O-rings and gas leakage on the rate of pressure rise was also studied.
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