| Project/Area Number |
07680469
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
社会システム工学
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| Research Institution | KYUSYU INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
HARA Yasutake Kyusyu Institute of Technology, Fucuty of Engineering, Department of Applied Chemistry, Professor, 工学部, 教授 (10039084)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Hidetsugu Kyusyu Institute of Technology, Fucuty of Engineering, Department of Applied Che, 工学部, 助教授 (40037940)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Aging behavior / Delay systems / Solid rocket propellant / Nitrocellurose in Mixed acid / Accelerating aging test / 寿命予測 / ガス発生剤 / エアーバッグ |
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| Research Abstract |
The aging under long term storage of explosives causes a change in a practical performance or an incidental explosion. In this paper, a delay composition of red lead/ ferrosilicone/antimony trisulfide, nitrocellulose in acid mixtures and a composite solid propellant consisted of ammonium nitrate and polyurethane binder were selected as model sample of aging. As an experimental method, accelerated aging tests carried out at the temperature little higher than a room temperature were adopted. The results obtained are as follows.
The delay composition of red lead/ ferrosilicone/ antimony trisulfide caused the decreased in burning rate by aging, which involved the low temperature reaction of red lead with antimony trisulfide. On the other hand, the burning rate of a composite solid propellant consisted of ammonium nitrate, aluminum and glycidyls azide binder increased after aging by the formation of acidic substance from ammonium nitrate and an oxidized intermediate of binder. At last, nitrocellulose in acid mixture caused a sutocatalytic degradation after a long induction period, which was ascribed to the formation of reactive intermediate. From the mechanisms and the temperature dependence of aging, a general idea will be presented to predict the aging behavior of explosives under an normal temperature.
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