Ammunition and explosive-charge making – Loading fireworks and bursting charges – Placing bursting charge in projectile
Patent
1988-11-29
1990-07-24
Locker, Howard J.
Ammunition and explosive-charge making
Loading fireworks and bursting charges
Placing bursting charge in projectile
102314, 102430, 1491096, 86 2014, 264 31, C06D 108, F42B 300, C06B 2100, C06B 4300
Patent
active
049428004
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for the manufacture of explosive cartridges containing, in a tubular casing, an explosive composition comprising hydrogen peroxide, an oxidizable organic material and a gelling agent. More particularly, it relates to a process where the gelling agent belongs to the class of macromolecular plastic materials.
The invention also relates to the explosive cartridges obtained using the said process.
TECHNOLOGY REVIEW
There have long been known explosive compositions which contain an aqueous solution of concentrated hydrogen peroxide combined with a finely divided oxidizable combustible material and an absorbent filler material (U.S. Pat. No. 3,047,441 to A. W. Baker et al. at column 2, lines 1 to 10 and column 6, claim 1). Among the absorbent filler materials employed, mention is made of the use of gel-forming products (column 2 lines 60 to 72), as well as of thermosetting or thermoplastic synthetic resins such as urea-formaldehyde, phenol-formaldehyde or polymethyl methacrylate resins (column 2, lines 54 to 58). In an alternative form, combustible materials capable of also acting as the filler material may be employed (column 2, lines 26 to 31).
These known explosive compositions generally have the disadvantage of detonating with difficulty or of resulting only in low detonation velocities, generally below 6,000 m/s, which consequently makes them unsuitable for use as industrial explosives, particularly as mine and quarry explosives and especially for dealing with hard rocks such as basalt and granite.
SUMMARY OF THE INVENTION
The present invention aims to overcome this disadvantage of the known explosives, by providing a process for the manufacture of explosive cartridges which have high detonation velocities, of the order of 7,000 m/s and above.
To this end, the invention relates to a process for the manufacture of explosive cartridges containing, in a tubular casing, an explosive composition comprising hydrogen peroxide, at least one oxidizable organic material and at least one gelling agent belonging to the class of macromolecular plastic materials; according to the invention, in a first stage, hydrogen peroxide, the oxidizable organic material and at least one precursor monomer of the gelling agent are mixed and, in a second stage, the macromolecules of the gelling agent are synthesized in situ in the tubular casing.
DETAILED DESCRIPTION OF THE INVENTION
The process according to the invention is adapted to the manufacture of cartridges whose tubular casings are produced with materials which are usually employed for the manufacture of explosive cartridges. Examples of such materials are waxed paper, cardboard, metal, especially copper, brass, bronze, zinc, aluminium, steels of various grades and rigid plastics such as, for example, vinyl resins, polyolefins, acrylonitrile-butadiene-styrene resins and their copolymers. The composite tubular casings produced by means of several of these materials, such as sheathed metals (Cu and brass in particular), are also suitable for the process according to the invention.
Hydrogen peroxide is employed in the process according to the invention in the form of a concentrated solution of hydrogen peroxide in a solvent. "Concentrated solutions" means solutions where the weight content of hydrogen peroxide is higher than 60%. Solutions containing at least 65% by weight and up to 99.9% by weight of hydrogen peroxide are highly suitable. Solutions which contain between 70 and 90% by weight of hydrogen peroxide are preferably employed. The solvent for hydrogen peroxide may be water or an inert organic solvent. Examples of suitable organic solvents are n-butanol, acetonitrile and chloroform. Water is the preferred solvent because of its negligible cost and of its lesser risks associated with its use in the presence of concentrated solutions of hydrogen peroxide.
In the process according to the invention, the oxidizable organic material employed consists of any organic material capable of oxidizing rapidly
REFERENCES:
patent: 2452074 (1948-10-01), Shawley et al.
patent: 3047441 (1962-07-01), Baker
patent: 3095334 (1963-06-01), Scurlock
patent: 3574011 (1971-04-01), Knight
patent: 3687746 (1972-08-01), Bieber et al.
patent: 3808062 (1974-04-01), Yokogawa et al.
patent: 4033264 (1977-07-01), Bolza et al.
patent: 4730534 (1988-03-01), Dupont
Bouillet Edmond
Colery Jean-Claude
Declerck Claude
Ledoux Pierre
Interox (Societe Anonyme)
Locker Howard J.
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