Nitroguanidine Gas Production, Pharmaceutical Design And Performance

This paper systematically introduces the development for a vehicle airbag gas generant. The development of this gas generant is for a replacement of the gas generant used in an imported gas generator. This gas generant is a non azide gas generant with fast gas generation, low burning temperature and relatively clean burning gas.By theoretical analysis, this paper studies the impact to nitro guanidine based gas generant from both nitrate and metal oxides. It demonstrates that the reaction heat of nitro guanidine with metal oxides is much lower than with nitrate. The gas yield is higher with nitrate than with metal oxides. It is defined that a mixed oxides can reduce the reaction temperature and raise the gas yield.By an experimental research with a sealed detonation device, a composition is defined with 42% nitro guanidine, 38.46% ammonium nitrate, 8% potassium nitrate, 6.54% manganese dioxide and 5% of polyethylene alcohol. The maximum pressure of this gas generant can reach 0.2MPa and the time to the maximum pressure is less than 50ms and its burning temperature is lower than 2000℃. The burning gas is relatively clean.After test comparison of this gas generant with the imported one in a 60 liter tank, it shows that this gas generant is stable in performance and can meet the product design requirements and be used as a substitute of the imported gas generant.This gas generant shows passive after impact test, friction test, flame sensitivity test and static electrical charge test.