C - Chemistry – Metallurgy – 06 – B
Patent
C - Chemistry, Metallurgy
06
B
52/50
C06B 31/06 (2006.01) C06B 21/00 (2006.01) C06B 25/34 (2006.01) C06B 29/08 (2006.01) C06B 31/40 (2006.01) C06B 45/10 (2006.01)
Patent
CA 1256702
Abstract The present invention relates to the field of compound pyrotechnic products. The invention relates to a three-step, solvent-free process for the manufacture of compound pyrotechnic products containing a thermosetting binder obtained by reaction of a polyhydroxylated prepolymer with a di- isocyanate, which process is characterized in that: - in a first step the said prepolymer is mixed with an energetic charge and with a quantity of diisocyanate representing 50 to 90% of the required stoichiometric quantity, - in a second step the remainder required to attain the said stoichiometric quantity is added and, after mixing, the pasty mixture thus obtained is extruded, - in a third step the crosslinking of the thermoset- ting binder is completed hot. The invention makes it possible to obtain industrially, by extrusion, small-diameter pyrotechnic products con- taining a thermosetting binder without restriction on the "pot life" period. The invention is particularly suitable for the production of compound propellent powders for arms.
502564
Perotto Christian
Ragon Philippe
Goudreau Gage Dubuc
Societe Nationale Des Poudres Et Explosifs
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