CS206868B1 - Pyrotechnical charge - Google Patents

Description

The present invention relates to the selection of the components and their relative proportions in the pyrothiocloat composition used to form the solid heads of the electric bridge board, monocomponent.

The electric bridle pllule is an essential part of the electric detonator, which ensures the conversion of electric energy into thermal energy, especially in the form of a flame, through which the explosive charge of the detonator is brought to an explosion.

One type of electric wire is of such a construction that a resistive wire is placed between the inlets forming a bridge, and the bridge is encased in a solid mass, which is usually composed of at least two layers of different pyrotechnic compositions. This coating is usually formed by depositing individual layers from a suspension of these pyrotechnic compositions in a medium of a high molecular weight solution, such as nitrooellulose, in an appropriate organic solvent, and then curing the layers by removing the solvent. In the following, this cover is called the header of the electrioc bridge.

In particular, the fire-forming composition forming the head is required to be periodically resilient to thermal energy, to a sufficient flame power and to release the necessary amount of heat during combustion. For these reasons, headers with two or more layers of different compositions are most often used. A heat-sensitive primer is usually applied to the bridge, usually in the mold

206,868 an ohmic individual (e.g. lead salts of nitroaminophenolates, cresolate, etc.). In order to increase the power of the flame, the ignition component is applied to the igniting component, which is usually a mixture of an oxidant and flammable substances. The requirement of regular functioning of these pills places considerable demands on the production theology and therefore there is an attempt to simplify production, i.e. the use of only one pyrotechnic mesh, to ensure that both desired properties are met.

Therefore, it is presently proposed to replace the embodiment with the igniter composition and the ignition composition with a single composition, and such a type of electriocular bridge pill is called a single component. The pyrotechnic composition is known to contain a metal powder, an oxidant and a binder with a metal powder content, e.g. Zr 30-40% or Al with a content of over 25%, or a KeMn with a content of over 20 µm. It is therefore a pyrotechnic composition with a considerable metal content. Experience to date has shown that the high metal content of the pyrotechnic composition makes it difficult to ensure the stability of the igniting parameters of the pill, which is a very important functional aspect.

A pyro-fire composition is also known which contains aromatic nitro compounds of a oxidant lead and a combustible material selected such that the amount of oxygen released by the oxidant (e.g. PbOg, BaO4) is only 1/4 to 1/5 of the amount consumed during combustion. To increase the combustion temperature, Si or Mg + Ce is added to the composition. In all these cases, however, these compositions, in comparison with the electriocular mL pills, whose head is formed by a separate ignition composition, require considerably more electrical energy to ignite, which is a major functional deficiency.

These drawbacks are overcome by solving a pyrothiocyanic composition for a bridged pellet, one-component with a fixed head, according to the invention, which consists of a mixture containing 20-50 preferably 30% 4,6 dinitro-2 amino-1 hydroxybenzene, 5-15 %, preferably 7%, of a metal powder such as Al or Zr and the remainder 75-35%, preferably 63%, of a mixture of oxidants, preferably KClO 4 and Pb 4 O 4 in a ratio of 29:34.

This solution according to the invention brings a number of advantages. One of the advantages is that the value of the electrical energy required for ignition does not change when compared to the two-component electric pill commonly used. This observation was observed when using a pyrotheonic composition containing the head

4,6 - dinitro - 2 amino - 1 hydroxy benzene ............... 30 #

KCIO ^ ................. 29 $

Pb ₃ O ₄ ............... 34%

AI or Zr ................ 7 with otherwise unchanged physical and chemical properties of the electriocular pill. Another advantage that has been found is that in the electro-eyed pellet according to the invention, higher values of ignition resistance from foreign unwanted sources are achieved, in particular the value of safe pulse, the value of resistance to discharge of electrostatic charge and in particular the value of safe current , which increased by an average of up to 40 Another advantage is the simplification of the production prooeau and thus the achievement of an economic benefit over the previous production.

Claims (1)

SUBJECT OF THE INVENTION A pyrothiocarbon composition for an electrically bridged pilull mono-component and a fixed head, characterized in that it is composed of a mixture containing 20 - 50%, preferably 30 £ 4.6 dinitro - 2 amino - 1 hydroxy benzene, 5 - 15% »preferably 7 of a metal powder such as Al or Zr and the remainder 75-35%, preferably 63, of a mixture of oxidizing agents, preferably potassium phosphate and lead oxide, in a ratio of 2: 34.