Resin-bonded water-bearing explosive
AssigneeE. I. Du Pont de Nemours and Company
InventorsCyril J. Breza, deceased, William E. Schaefer
Life of this patent
Estimating the term…
Abstract
Self-supporting water-bearing explosive products, e.g., for use as primers and in blasting and seismic charges, contain discrete cells of an aqueous solution of an inorganic oxidizing salt and/or of an amine salt encapsulated by a crosslinked (thermoset) resin matrix. The products are sensitized by a dispersed solid high explosive and/or gas bubbles or voids. Preferred primers are sensitized by PETN and are rigid. The products are made by crosslinking a liquid polymer in the continuous phase of an emulsion which contains the aqueous solution as a discontinuous phase.
Claims31
A self-supporting water-bearing explosive product comprising
- (a) a mass of crosslinked organic resin as a fuel component forming a continuous matrix;
- (b) an aqueous solution of at least one salt of an inorganic oxidizing acid as an oxidizer component forming a discontinuous phase emulsifyingly dispersed within, and encapsulated by, said continuous matrix, said salt being derived from nitric or perchloric acid and a base selected from the group consisting of ammonia, amines, and alkali and alkaline-earth metal hydroxides;
- and
- (c) dispersed in said matrix and/or said aqueous solution, a sensitizer adapted to induce or enhance the detonability of said solution-containing resin matrix;
- said product having a density of at least about 1.0 gram per cubic centimeter.
A self-supporting explosive primer comprising
- (a) a mass of crosslinked organic resin forming a continuous matrix;
- (b) an aqueous solution of at least one salt of an inorganic oxidizing acid forming a discontinuous phase dispersed within, and encapsulated by, said continuous matrix, said salt being derived from nitric or perchloric acid and a base selected from the group consisting of ammonia, amines, and alkali or alkaline-earth metal hydroxides;
- and
- (c) a solid high explosive sensitizer selected from the group consisting of organic nitrate esters and nitramines dispersed in said matrix and/or said aqueous solution;
- said primer having at least one perforation therein for receiving an initiating device.
A method of producing a resin-bonded water-bearing explosive product comprising:
- (a) mixing (1) an aqueous solution of at least one salt of an inorganic oxidizing acid, said salt being derived from nitric or perchloric acid and a base selected from the group consisting of ammonia, amines, and alkali and alkaline-earth metal hydroxides, (2) a mixture of a liquid polymer and a monomer crosslinkable therewith, and (3) an emulsifying agent, whereby an emulsion forms wherein said aqueous salt solution is a discontinuous emulsion phase dispersed within a continuous emulsion phase formed by said polymer-monomer mixture;
- (b) incorporating in the emulsion, prior to, during, and/or after its formation, a sensitizer adapted to induce or enhance the detonability of said emulsion;
- and
- (c) effecting a crosslinking reaction in the continuous phase of the sensitized emulsion whereby said aqueous solution and said sensitizer become encapsulated by a mass of crosslinked organic resin.
An emulsion for use in making a self-supporting water-bearing explosive product comprising
- (a) a liquid crosslinkable resin formulation forming a continuous emulsion phase;
- (b) an aqueous solution of at least one salt of an inorganic oxidizing acid forming a discontinuous emulsion phase dispersed within said continuous phase, said salt being derived from nitric or perchloric acid and a base selected from the group consisting of ammonia, amines, and alkali and alkaline-earth metal hydroxides;
- and
- (c) an emulsifying agent.
Dependencies are inferred from the claim text.