C - Chemistry – Metallurgy – 06 – B
Patent
C - Chemistry, Metallurgy
06
B
C06B 21/00 (2006.01)
Patent
CA 2628717
The invention concerns a semi-continuous dual-component method for obtaining a composite explosive charge consisting of a filled solid polyurethane matrix whereof the filler is powder-based and comprising at least one organic nitrated explosive. Said method includes the following successive steps: obtaining a pasty explosive composition essentially consisting of the following ingredients: a polyol prepolymer, a polyisocyanate monomer, a plasticizer, and a powder-based solid filler comprising at least one organic nitrated explosive, by mixing continuously a past component A' and a liquid component B', prepared, discretely, from said constituent ingredients; introducing into a mold said pasty explosive composition; and thermally crosslinking said composition in said mold. The invention is characterized in that said liquid component B' comprises 90 to 99 wt. % of said polyisocyanate monomer; said pasty component A' comprises the total polyol polymer, the total powder-based solid filler and the remaining 1 to 10 wt. % of the polyisocyanate monomer; the plasticizer being indifferently distributed between said components A' and B'; and in that the continuous mixture of said components A' and B' is performed such that the component A'/component B' mass ratio is constant, ranging between 95.05/4.95 and 99.5/0.45. Said method constitutes a particularly interesting improvement to the method according to patent EP-A-I 133015.
La présente invention a pour objet un procédé semi-continu d'obtention d'un chargement explosif composite constitué d'une matrice solide polyuréthanne chargée dont la charge est pulvérulente et comprend au moins un explosif nitré organique. Ledit procédé comprend les étapes successives ci-après : - l'obtention d'une composition explosive pâteuse constituée essentiellement des ingrédients ci-après : ~ un prépolymère polyol, ~ un monomère polyisocyanate, ~ un plastifiant, et ~ une charge solide pulvérulente comprenant au moins un explosif nitré organique, par mélange en continu d'un composant A' pâteux et d'un composant B' liquide, préparés, de façon discontinue, à partir desdits ingrédients constitutifs ; - l'introduction dans un moule de ladite composition explosive pâteuse ; et - la réticulation thermique de ladite composition dans ledit moule ; et se caractérise en ce que : - ledit composant B' liquide comprend 90 à 99 % en poids dudit monomère polyisocyanate ; - ledit composant A' pâteux comprend la totalité du prépolymère polyol, la totalité de la charge solide pulvérulente et les 1 à 10 % en poids restants du monomère polyisocyanate ; le plastifiant étant indifféremment réparti entre lesdits composants A' et B' ; et en ce que le mélange en continu desdits composants A' et B' est mis en AEuvre de sorte que le rapport massique composant A'/composant B' soit constant, compris entre 95,05/4,95 et 99,55/0,45. Ledit procédé constitue un perfectionnement particulièrement intéressant au procédé selon EP-A-I 133 015.
Eurenco
Eurenco France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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