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Authors:A. Langlet: Swedish Defence Materiel Administration, Sweden
N. V. Latypov: FOI, Swedish Defence Research Agency, Department of Energetic Materials, Sweden
M. Johansson: FOI, Swedish Defence Research Agency, Department of Energetic Materials, Sweden
J. Dahlberg: EURENCO Bofors AB, Sweden
Publication title:New ingredients in nitrocellulose based propellants
Conference:The Swedish Section for Detonics and Combustion; Fourth International Disposal Conference
Publication type: Abstract
Article No.:007
Abstract:In Sweden there is an ongoing effort to develop a new gun propellant for the Uniflex 2*; 155 mm modular charge system aimed for a new Swedish field howitzer Archer*. The Archer Artillery System is a 155 mm L/52 howitzer mounted on a modified articulated hauler. The system-solution features several advantages among which increased fire-power and mobility are a two.

The propellant charge first suggested for the Archer system was a bimodular charge system with two different propellants. This is a common solution that has several disadvantages in relation to a unimodular charge where all the modules are equal. To design a fully functioning unimodular system is however rather difficult; and numerous efforts has been made (by several manufacturers) to design such a system.

The use of new energetic fillers developed at FOI; makes it possible to tweak the burning characteristics in such a way that the design problem of a unimodular charge might be solved. A recent government funded project has addressed the possibility to develop a low sensitity unimodular charge system where several propellant components have been up-dated.

After a screening of possible filler and binder systems; a system based on nitrocellulose (NC); guanylurea dinitramid (FOX-12) and energetic plasticizers was selected. The reason to select NC was price and performance whereas FOX-12 and NENA were selected due to the low sensivity and good burning behaviours. Acardite II was the first choice of stabilizer and is considered among the best stabiliser for NC/energetic plasticizer systems. Acardite II is however; as many other well known stabilizers; known to form nitrosoamines when it reacts with the nitrous oxides formed in the decomposition of the propellant matrix. As nitrosoamines are infamous for their carcinogenity a new group of compounds was investigated; not previously used as stabilizers for NC; namely phenyl aliphatic ethers.

In this work; the preferred phenyl aliphatic ether was 1;4-dimethoxybensene. With this compound as a stabilizer; the propellant fulfils the storage stability test (STANAG4582) at 90 °C; corresponding to 20 years of storage at 25° C. The new compound is considered as a replacement stabilizer for diphenylamine derivatives used in NC-containing propellants. The conclusion is that these new stabilizers have similar or better effect in stabilizing NC-based propellants than diphenylamine-derivatives and that they do not form carcinogenic nitrosamines.

* Uniflex 2 and Archer are both trademarks belonging to BAE-systems Bofors AB.

No. of pages:2
Series:Linköping Electronic Conference Proceedings
ISSN (print):1650-3686
ISSN (online):1650-3740
Publisher:Linköping University Electronic Press; Linköpings universitet

A. Langlet, N. V. Latypov, M. Johansson, J. Dahlberg (2006). New ingredients in nitrocellulose based propellants, The Swedish Section for Detonics and Combustion; Fourth International Disposal Conference;article=007 (accessed 2/8/2016)