Semi-continuous two-component method for obtaining a composite explosive charge with polyurethane matrix

Abstract

The present invention relates to a semi-continuous method for obtaining a composite explosive charge comprising a solid polyurethane matrix loaded with a charge, the charge being in powder form and comprising at least one nitro-organic explosive. The said method comprises the following successive steps: the obtaining of a pasty explosive composition comprising essentially the following ingredients: a polyol pre-polymer, a polyisocycanate monomer, a plasticising agent, and a solid charge in powder form comprising at least one nitro-organic explosive, by continuous mixing of a pasty component A′ and a liquid component prepared discontinuously from the said constituent ingredients, the introduction into a mould of the said pasty explosive composition, and the thermal cross-linking of the said composition in the said mould, and being characterised in that: the said liquid component B′ comprises 90 to 99% by weight of the said polyisocyanate monomer; the said pasty component A′ comprises the whole of the polyol pre-polymer, the whole of the solid charge in powder form and the remaining 1 to 10% by weight of the polyisocyanate monomer, the plasticising agent being distributed without distinction between the said components A′ and B′, and in that the continuous mixing of the said components A′ and B′ is carried out in such a way that the weight ratio between component A′/component B′ is constant, being between 95.05/4.95 and 99.55/0.45. The said method constitutes a particularly interesting improvement of the method according to EP-A-1 133 015.

Dependencies are inferred from the claim text.