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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.36, No.2, 347-351, 1998
NEPE계 추진제의 노화에 의한 안정제 감소
Consumption of Stabilizers by Aging in NEPE Solid Propellant
임유진, 류백능, 박영철, 정병훈, 박명규
질화 가소제로 BTTN과 DEGDN이 사용된 NEPE계 고체 추진제에 안정제로 NMA와 2-NDPA를 사용하여 가속 노화 시험에 의해 안정제의 함량 변화를 고찰하였다. NMA와 2-NDPA 모두 0차 반응에 의해 소진되고 있음을 알 수 있었고, 반응 속도 상수가 Arrhenius식을 따른다고 할 때 20-80℃ 온도 구간에서 NMA는 60℃를 기점으로, 2-NDPA는 70℃를 기점으로 서로 다른 활성화 에너지를 지니고 있었다. 따라서 장기 보관에 따른 안정제의 함량 변화를 예측할 경우에는 낮은 온도에서 얻어진 반응 속도식으로 계산하는 것이 보다 정확하였다. 고체 추진제에서 NMA와 2-NDPA가 소진되더라도 질화 가소제의 분해로 발생된 기체가 추진제 외부로 방출될 수 있는 온화한 조건에서는 gas fissuring 현상이 발생되지 않음을 알았다.
The depletion rated of NMA and 2-NDPA were investigated by accelerated aging test in NEPE solid propellant containing BTTN and DEGDN as nitrate ester plasticizers. It was found that both NMA and 2-NDPA were depleted by the 0th order reactions and these reactions had two kinds of activation energy which showed the break-point at 60℃ for NMA and 70℃ for 2-NDPA from Arrhenius plots in temperature range of 20-80℃. Therefore, the stabilizer content in propellant could be predicted much better by using reaction rate in the low temperature range than that in the high temperature range. The gas fissuring was not occurred under mild conditions like slow evacuation of gases from decomposition of nitrate ester plasticizers even though NMA and 2-NDPA were completely depleted in propellant.
Keywords: NEPE Propellant; Stabilizers; Accelerated Aging
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