DE1110065B - Self-supporting explosives mixture that can be deformed into foils and other structures - Google Patents

Description

Self-supporting explosives mixture that can be deformed into foils and other structures For many purposes it is desirable to use crystalline, highly explosive compounds, like pentaerythritol tetranitrate (PETN) and cyclotrimethylene trinitramine (ROX), not in the form of crystals or grains, but in the form of self-supporting bodies. For example, if you want metallic objects according to the US patent specification 2 367 206 connect the method described with each other, one works with explosive shells. These consist of rigid, ring-shaped, made of paper, etc., with granular, Highly explosive shell vessels filled with metal bodies and a metal sleeve must be pushed, in many cases tearing the necessarily rigid vessels, so that these often occur during the Storage and transport.

The task was therefore to use such rigid bodies as possible off and deliver a pliable, self-supporting mass of explosives, which can be deformed into foils and other structures and also sticks so tightly together, that they can be cut, pressed or otherwise deformed over metal (See U.S. Patent 2,703,297). When using deformed charges containing perforated jacket pipes into which explosives previously had to be pressed, it means a significant relief when now with stable, self-supporting, molded explosives can be worked.

All previous attempts at self-supporting, highly explosive mixtures of explosives to deliver for the specified fields of application, have so far not been satisfactory Results. It has been suggested to use nitrocellulose as a binder to use for crystalline, highly explosive explosives in order to make them more self-supporting To be able to give structures, especially foils. Those made in this way However, structures were not tough enough. In addition there was the danger of nitrocellulose made processing and use difficult. The addition of wax is also included with the The same goal has already been attempted, but such large amounts of wax have to be used use in order to achieve sufficient cohesion that the body phlegmatizes and could not be shot down.

The incorporation of rubber did not lead to success either, on the one hand because the production of a homogeneous mixture of pure rubber and explosives is difficult even if a volatile dispersant is used because the Mixture ingredients tend to be excreted and on the other hand because the accumulating mass is difficult to handle. For example, if you have that Dispersant removed from the mixture before the desired structure is formed, the mixture can only be mixed with great difficulty, for example through Roll out, transfer into foils, as it has a strong tendency to spring back. One deforms but the mixture still containing dispersant, for example by pouring or extrusion, then form upon subsequent volatilization of the dispersant in the moldings undesired airless spaces, which result in a phlegmatization and uneven density. Inconsistent density of the molded body becomes furthermore caused by the difficulty prior to extrusion or potting to set a uniform consistency of the mixture. Does it even succeed, mixtures to process rubber and explosives into foils, the latter tend to not to keep the desired shape, but to the original dimensions spring back. Such films have not been found in many areas of application proven.

The invention is therefore based on the object of providing a self-supporting, to foils and other structures deformable explosives mixture too deliver that can be produced simply and reliably. This mixture is supposed to have a uniform density and no springback phenomena after deformation demonstrate.

The explosives mixture according to the invention consists of: a) A capsule-sensitive, crystalline, highly explosive explosive compound, in particular pentaerythritol tetranitrate and / or cyclotrimethylene trinitramine, b) one of an elastomer and a thermoplastic Polyterpene resin existing binder.

Expediently, 25 to 75% of the elastomer is in the binder, in particular Butyl rubber and / or polyisobutylene and 75 to 25% of the polyterpene resin. According to one embodiment of the invention, the self-supporting explosives mixture Contain 92.5 to 77.5% of the explosive and 7.5 to 22.5% of the binder.

For the production of foils from the self-supporting explosives mixture mix 92.5 to 77.5 parts of the explosive with 7.5 to 22.5 parts of the dissolved, 25 to 75% of the elastomer and 75 to 25% of the thermoplastic polyterpene resin containing binder and presses or rolls the mixture after evaporation of the solvent to slides out. The resulting foils or other deformed structures stand out characterized by high density and high detonation speed.

The incorporation of the binders according to the invention results in tough, pliable ones Explosives mixtures that show only very slight springback phenomena. All Structures are water-resistant and under normal conditions or low temperatures also storable.

You can't just roll and squeeze the new explosives mixes, but also cut, chop, etc.

If you work in more than 92.5% of the high-explosive material, so the toughness suffers and the deformed bodies tend to crack. When applied less than 77.5% of the explosive does not detonate the body. With compliance of the listed proportions of explosives and binders can be obtained Detonate foils and structures with conventional detonators, with detonation velocities from 7000 m / sec. can be achieved. Except for the listed, highly explosive compounds you can also incorporate other capsule-sensitive crystalline, highly explosive compounds, for example other organic nitrates such as nitromannitol and other nitramines, such as cyclotetramethylenetetranitramine and ethylenedinitramine. Used in some cases mixtures of these compounds or of highly explosive compounds and less sensitive explosives such as ammonium nitrate.

Elastomers are substances whose plastic, elastic behavior is due to pronounced rubber elasticity is excellent.

As shown in Example 2 below, increases as the content increases of elastomers in the binder, the tendency to spring back in the explosives mixture. If the elastomer makes up more than 75% of the binding agent, the spring-back effect makes up the mixture unusable. Conversely, at least 25% of elastomers must be present, if not, insufficient ductility and strength, as well as lack of cohesion should be accepted.

In principle, all known elastomers can be used in the context of Invention use, especially natural rubber, synthetic rubber such as the GR-S rubber, reaction products of aliphatic polyhalogen derivatives with alkyl polysulphides (Trade name: Thiokol, manufacturer: Thiokol Corp.) Neoprene, butadiene-acrylonitrile copolymers (Trade name: Buna N), rubber-like plastics made from crosslinkable, sulfochlorinated Polyethylene (trade name: Hypalon S-2, manufacturer: E. I. du Pont de Nemours & Co.) etc.

Thermoplastic terpene resins are in a solid or dissolved state commercially available in various qualities. General formula: (C101416), They are made up of mixtures of polymers of different chain lengths and different Molecular weight together. Average molecular weight: 1200 to 1250. (About chemical and physical properties of polyterpene resins see »Encyclopedia of Chemical Technology ", Kirk and Othmer, Vol. 13, 1954, pp. 700 to 702 [Interscience Publishes, Inc.]).

The procedure described in Example 1 for film production has particularly proven itself in terms of achieving a product of more uniformity high density. Many hydrocarbon solvents can be mixed with one another of the ingredients. The mixture can also be mixed in different ways drying, for example by air drying at ambient temperature, by hot air drying on drying plates or by warming up directly in the mixer itself.

A particular advantage of the explosives mixture according to the invention lies in that water is incompatible with the mixture consisting of elastomer and resin is, separates from it and can therefore be removed by draining or suction can. The last remaining water is then removed by evaporation during drying. Therefore one can introduce the highly explosive explosive in the water-moist state, so in a much less dangerous form. Of course, you must be absent be worked by water if hygroscopic components were also used.

A particular advantage of the new explosives mixture lies in the Possibility of using a on the deformed body, for example a film, applied thin layer of adhesive bonding the film to other bases to reach. This results in further possible applications, for example in metal hardening. One can also use a foil consisting of the explosives mixture Cover one side with an adhesive layer and then one on top of the adhesive Apply a layer of scrap crepe paper. If you want such a foil for hardening metals use, remove the crepe paper and press the adhesive surface against it the surface of the metal to be hardened. a firm bond between the film and Metal.

The following examples illustrate the invention. All quantities are weight specifications. In all of the examples, one was essentially made of a polymer of the ß-pinene existing Terpene resin processed. (Trade name: Piccolyte, Manufacturer: Pennsylvania Industrial Chemical Corporation). Of course you can other thermoplastic terpene resins can also be used.

Example 1 283 parts of water-moist pentaerythritol tetranitate (PETN), based on dry product, were with 125 parts of a 50 parts of the 50:50 mixture of butyl rubber and terpene resin containing hexane solution for 10 minutes under intensive Stirring mixed. The water which separated out over the mass was then decanted and the paste-like adhesive mass is removed from the mixer and placed on a drying tray air dried overnight. After the water and hexane have evaporated the one made up of 85 parts PETN and 15 parts binder was no longer used adhesive mass rolled out between brass rollers to form foils.

The films had a density of 1.45Z / cm3 and were sensitive to impact (Drop hammer sample, 5 kg weight) of 30.5 cm (50% detonation point). The slides could detonated with detonators No. 6, detonation speed: 7200 m / sec. The foils were firm, pliable and had such little springback that they that they retained the shape obtained when they were bent. After a month of storage there was no change in their properties at normal and low temperatures. If the films were immersed in water (0.7 kg / cm2), no action could be seen watch.

Example 2 Analogously to Example 1, two mixtures were prepared, but the proportions of elastomer and terpene resin in the binder varied. Table 1 shows the data determined during the testing of the samples produced: Panel I. Ratio deto- Elastomeric shock sensitivity Mixture to resin density speed in the cohesiveness (drop test) medium g / cms cm m / sec. A ( 1 ) 75: 25 1.43 27.9 6800 B (2) 25: 75 1.45 43.1 7200 (1) Tough film with good flexibility, low stiffness and low springback. (p) Tough film with good pliability, soft and slightly sticky, no spring back. Foils produced from the two mixtures could be detonated with detonator no. 6.

EXAMPLE 3 Several explosive masses were produced from PETN and a 50:50 mixture of butyl rubber and terpene resin, but the amounts of PETN and binder varied. For test results see table 1I. Plate II Shock Sensitivity Deto- Parts PETN lichkest nations Mixture to binding density medium (drop test) ability g / cms cm m / sec. 1 77.5: 22.5 1.45 53.3 6600 2 30:20 1.41 24.3 7000 3 82.5: 12.5 1.50 38.1 6900 4 87.5: 12.5 1.41 53.3 6800 5 90: 10 1.49 33.0 6900 6 92.5: 7.5 1.35 45.7 6900 All foils were firm and pliable, they showed little springback and could be detonated with detonators no. 6.

Example 4 A mixture prepared analogously to Example 1 was used Rolled out foils, but using polyisobutylene instead of butyl rubber (Trade name: Vistanex, manufacturer: Enjay Company, Inc.). The slides were stuck supple, they had a density of 1.41 g / cm3. When testing with the drop hammer test (5 kg weight) it was found that the 50% detonation point of the film was 27.9 cm lay. Detonation speed: 6700 m / sec. The slides could with a primer No. 6 to be detonated.

Example 5 An 85:15 blend of RDX and that of 50 parts butyl rubber and 50 parts of terpene resin existing binder, as described in Example 1, manufactured. The mixture was rolled into sheets weighing approximately 4 g each 2.54 cm2. Density: 1.48 g / cm3. The foils were firm and pliable, they detonated with one Speed of 7100 m / sec. After the drop hammer test (5 kg weight) resulted for the 50% detonation point a height of fall of 66 cm. The foils could with the Detonator No. 6 detonated.

Claims (3)

CLAIMS: 1. A self-supporting, to films and other structures deformable explosives mixture consisting of a mixture of a capsule-sensitive crystalline high explosive compound, particularly pentaerythritol and / or cyclotrimethylenetrinitramine, a synthetic resin binder, characterized in that the binder consists of a mixture of an elastomer, with a thermoplastic polyterpene resin. 2. Self-supporting explosives mix according to claim 1, characterized in that the binder consists of 25 to 75% of the Elastomers, especially butyl rubber and / or polyisobutylene and 75 to 25% of the polyterpene resin. 3. Self-supporting explosives mixture according to claim 1 and 2, characterized in that the mixture contains 92.5 to 77.5% of the explosive and contains 7.5 to 22.5% of the binder.