Patent ID: 7887651

Claim:
A semi-continuous method for obtaining a composite explosive charge comprising a solid polyurethane matrix loaded with a charge, the method comprising the following successive steps: continuously mixing a pasty component A′ and a liquid component B′ to obtain a pasty explosive composition comprising: a polyol pre-polymer, a polyisocyanate monomer, a plasticising agent, and a solid charge in powder form comprising at least one nitro-organic explosive; introducing the pasty explosive composition into a mold; and thermally cross-linking the composition in the mold, wherein: A′ and B′ are prepared discontinuously from the constituent ingredients, the liquid component B′ comprises 90 to 99% by weight of the polyisocyanate monomer, the 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 components A′ and B′, and the continuous mixing of the components A′ and B′ is carried out in such a way that the weight ratio of component A′ to component B′ is constant, being between 95.05/4.95 and 99.55/0.45.