NO884271L - CASTABLE EXPLOSION WITH AN ARTIFICIAL BINDER FOR WEAPON SYSTEMS. - Google Patents

Abstract

A moldable explosive with a plastic mixer for weapon systems exhibits in the high power explosive group the low impact flow rate using a high fluorine liquid liquid binder.

Description

The present invention relates to a castable explosive with a plastic binder for weapon systems.

Modern weapon systems make high and ever-increasing demands on the explosives used.

Firstly, high performance is required, such as high detonation speed when used against hard, i.e. armored targets and secondly, low sensitivity, i.e. low probability of force in ongoing reaction under load and due to other external influences, such as fire or shelling.

High-power explosives with a large proportion of secondary explosives, i.e. compressible substances with more than 95% explosives or castable explosives on a TNT/octogen basis, do not generally satisfy the safety requirements today.

Castable explosives with plastic binders are not sensitive, however, due to a proportion of more than 10% inert binders, they exhibit a clearly reduced performance which greatly limits their use as a high-power charge.

On the other hand, it is from German announcement script

DE 35 45 983 Al known in a castable, insensitive high-power explosive to use a hardenable binder, such as silicone rubber in a proportion of 10-40$. The disadvantage is that, although there is safety against shock sources and heat, the detonation speed is however approx. 7,400 m/s too small for the relevant use cases.

In the time that has passed, there has been no shortage of attempts to develop binding systems which act as 'energy boosters' in the detonation front and thus have an effect-increasing effect, and at the same time meet the desired requirements for safety, mechanical properties and manageability. Such binder systems are termed active binders. Thus, it is e.g. attempted to incorporate nitro or acid groups into the plastic molecules. Another way is based on the use of active plasticizers, such as fluoronitroalcohol and compounds derived from these, which are added to the plastic binder.

However, for various reasons, these attempts have not brought any completely satisfactory results. It can be mentioned e.g. lack of mechanical properties, expensive or toxic chemicals or unsatisfactory chemical stability of the active binder.

It has long been known that fluorine-containing compounds mixed with secondary substances reduce performance less than fluorine-free substances. Obviously, there is an energy-yielding conversion of the fluorine-containing compounds in the detonation front.

For these reasons, fluorine-containing plastics have been used for a long time for the production of explosives.

However, as these plastics are solid and chemically inert and must be used either as a powder or in the form of a solution in a suitable solvent, they have so far only been able to be used for pressable explosives, see European patent application 0 125 166.

The present invention is to provide instructions for a castable explosive with such a plastic binder that leads to an explosive with an effect that is significantly higher than that which applies to the high-effect explosive known from the above-mentioned DE-OS 35 45 983. The sensitivity must be significantly less than with known explosives with comparable high performance.

This is achieved with an explosive which has acquired the characteristic features in claim 1.

Beneficial further developments are indicated in the dependent claims.

The advantage is that, with the help of the invention, a castable explosive is obtained which can be produced cheaply with the help of machines which are commonly used for the production of castable, plastic-bound explosives. The explosive also exhibits good mechanical values at low temperatures. Extreme shock stresses during shelling are reduced in the non-critical area.

According to claim 7, a highly effective pressure plateau is achieved in the target by means of aluminum components known from explosives.

The highly fluorinated plastic is available as fluorinated polydiol and as fluorinated polydiisocyanate. These can be cross-linked to highly fluorinated polyurethane.

Example:

At room temperature, 85 wt-# of octogen was added

5 wt-# of fluorinated polydiol and 10 wt-# of fluorinated polydiisocyanate and intensively mixed. At the same time, 0.2 wt% of a trihydric alcohol, 0.1 wt% ferric acetonyl acetate and 0.1 wt% lecithin were mixed. The mass is vigorously mixed under vacuum and was filled into a suitable mold and hardened at approx. 60°C.

Claims (7)

1. Moldable explosive with a plastic binder for weapon systems, characterized by a) 55 - 90 wt-# of a particulate high-power explosive, such as hexogen or octogen, b) 10 - 45 wt-# of a hardenable, flowable binder with a high fluorine content. 2. Composition according to claim 1, characterized in that the component b) consists of one or more liquid prepolymers with a high fluorine content and there hardened into a solid polymer using a suitable method. 3. Composition according to claim 1, characterized in that component b) consists of polyhydroxy derivatives and polyisocyanate derivatives with highly fluorinated compounds which have been reacted with each other. 4. Composition according to claim 1, characterized in that component b) consists of polyhydroxy derivatives of highly fluorinated compounds which have been reacted with a suitable polyisocyanate, 5. Composition according to claim 1, characterized in that component b) consists of a polyisocyanate derivative with a highly fluorinated compound which has been reacted with a polyfunctional alcohol. 6. Composition according to claim 1, characterized in that component b) consists of functionalized allphatic perfluoropolyether. 7. Composition according to claim 1, characterized in that the explosive composition contains 10 - 30 weight-# of aluminum powder with a particle size smaller than 0.5 mm.