Process for the solvent-free manufacture of compound pyrotechnic products containing a thermosetting binder and products thus obtained
US4657607A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1986 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Feb 26, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC06B45/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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 diisocyanate, which process is characterized in that: PA1 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, PA1 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, PA1 in a third step the crosslinking of the thermosetting binder is completed hot. The invention makes it possible to obtain industrially, by extrusion, small-diameter pyrotechnic products containing a thermosetting binder without restriction on the "pot life" period. The invention is particularly suitable for the production of compound propellent powders for arms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.