Substance mixtures based on potassium benzoate (KDNBF), potassium picrate (KPIC) and copper picramate (CUPIM)

Abstract

Pyrotechnic mixture with potassium benzanate, said pyrotechnic mixture comprising a binary or ternary intermixture comprising at least two selected from potassium benzanate, copper picramate and potassium picrate.

Description

[0001] Mixtures based on potassium benzanate (KDNBF), potassium picrate (KPIC) and copper picramate (CuPIM)

[0002] The present invention relates to mixtures of substances based on potassium benzanate (KDNBF), potassium picrate (KPIC), and copper picramate (CuPIM), and to methods for producing a suspension of these substances. Furthermore, the present invention relates to their use as environmentally safe igniters and ignition agents for use in an ignition system, typically applicable to ignition pellets with a resistance range of 0.1 ohms to 20 ohms.

[0003] In recent decades, lead and chromium compounds, such as lead styphnate, lead picrate, lead chromate, or similar substances, were frequently used as the first layer surrounding the detonator in ignition systems. For ecological and occupational hygiene reasons, these compounds have recently been replaced, or are in the process of being replaced, by alternative substances. Particularly in light of Directive 2011 / 65 / EU, there is an increased need within the industry to replace chromium- and lead-containing compounds in detonators and explosive devices. KDNBF has recently proven to be a promising, environmentally friendly substitute.

[0004] The use of various KDNBF-containing mixtures as electrically initiable pyrotechnic mixtures for use in connection with ignition systems, in particular ignition pills and igniter pills, is already known.

[0005] German patent DE 19912622 A1 relates to initiating explosives and igniters for igniting boosters or propellant charges or for generating pressurized gas, wherein the initiating explosives are electrically ignitable and selected from 2-diazo-4,6-dinitrophenol, 4-diazo-2,6-dinitrophenol, dipicrylditetrazol, from the salts of 2-diazo-4,6-dinitroresorzin, 4-diazo-2,6-dinitroresorzin, dinitrobenzofuroxane, trinitrophenol or trinitroresorzin, or from mixtures of these initiating explosives. The salt of dinitrobenzofuroxane may be potassium dinitrobenzofuroxarate (KDNBF). US3763783 A discloses detonators and methods for their manufacture, in which a suspension of a primary explosive composition is prepared in water, to which a small amount of one or more organic hydrophilic polymers is added in a proportion of 1 to 10 percent by weight of the dry primary explosive composition.Bridge wires are immersed in the suspension and removed along with the adhering material, and the resulting detonator heads are left to dry.

[0006] WO2022153314A1 discloses a method for extracting quarry material using a large number of blast holes containing small quantities of highly explosive material. The explosive material may be potassium dinitrobenzofuroxane (KDNBF).

[0007] AT 527095 A2 discloses a suspension of an explosive composition of a pill-shaped detonator head for industrial electric detonators, which consists of 30-60 parts by weight of potassium salt of dinitrobenzofuroxane, 15-35 parts by weight of potassium perchlorate, 5-20 parts by weight of zirconium, 5-20 parts by weight of boron and 5-20 parts by weight of calcium silicide in a 1-5% nitrocellulose or fluoroelastomer solution in an organic solvent.

[0008] EP4140973 describes an environmentally friendly ignition mixture for a detonator pellet for industrial electric detonators, consisting of 30 to 60 wt% KDNBF, 15 to 35 wt% potassium perchlorate, 5 to 20 wt% zirconium, 5 to 20 wt% boron, and 5 to 50 wt% calcium silicide. The components of the explosive mixture are prepared as a suspension in an organic solvent, preferably consisting of amyl acetate, butyl acetate, propyl acetate, or their isomers.

[0009] From DE10039447, the use of KDNBF as a pyrotechnic material as a component of a mixture, which preferably comprises KDNBF, barium styphnate monohydrate (BARSTY), cis-bis-(5-nitrotetrazolato)tetra-aminecobalt(III)perchlorate (BNCP), 2-(5-cyanotetrazolato)pentaaminecobalt(III)perchlorate (CP), diazidodinitrophenol (DDNP), 1,1-diamino-3,3,5,5-tetraazidocyclotriphosphazene (DATA), cyclotetramethylene tetranitramine, lead azide or lead styphanate as the primary pyrotechnic material, is known, wherein KDNBF is particularly preferably used.

[0010] EP1064241 A1 describes electrically ignitable initiating explosives which may contain, among other things, KDNBF in their composition and in which the weight fraction of the initiating explosives is between 20 and 70 wt.%.

[0011] In CZ294317, an explosive mixture comprising KDNBF as an explosive is described, which does not contain any environmentally hazardous components, and in which the explosives and auxiliaries together constitute between 10 and 98 wt% of the mixture, with the auxiliaries making up to 55 wt%. The substance is applied to the carrier material by immersion.

[0012] From DE3321943, lead- and barium-free ignition compositions consisting of initiating explosives in a mixture with oxidizing agents are known, which may include diazole as initiating explosives. These are preferably ignited by mechanical action.

[0013] EP0469458 shows an electric detonator for detonators with a base charge made of highly explosive material, wherein the detonator has a connecting piece made of energetic material as a detonator carrier, which can be a semi-metal with a pn junction.

[0014] The current state of the art shows that KDNBF and KDNBF-containing mixtures have a wide range of applications in the ignition and ignition technology industry. However, when present as a single component, this compound exhibits limited temperature resistance and relatively high sensitivity to electrostatic discharge (ESD), impact, and friction, which complicates its simple and unrestricted use in ignition systems. Therefore, there is a need for KDNBF-containing mixtures that improve these physical properties.

[0015] The invention aims to provide environmentally safe pyrotechnic mixtures for applications in filament bridge technology and their equivalent application on semiconductor substrates, utilizing pn junctions on a single chip or multiple diodes, a Zener diode, or bipolar or unipolar transistors, which exhibit suitable temperature resistance, ESD, impact, and abrasion resistance as described in EN 16265. A further advantage of the described mixtures is the absence of perchlorates, which should be avoided due to their corrosive properties and occupational hygiene concerns.

[0016] According to the invention, to solve this problem, a pyrotechnic mixture is provided which comprises a binary or ternary mixture comprising at least two selected from potassium dinitrobenzofuroxarate (KDNBF), copper picramate (CUPIM) and potassium picramate (KPIC).

[0017] The composition of the mixture can vary as needed, with each of the components KDNBF, CUPIM, and KPIC potentially having a zero proportion. This is because the substances exhibit significantly different sensitivities. This is evident, for example, in the deflagration points: approximately 210°C for KDNBF, approximately 255°C for CUPIM, and approximately 330°C for KPIC.

[0018] The energy content, measured in an IKA bomb calorimeter, is typical for ignition mixtures for all three substances: KDNBF approx. 2900 J / g, CUPIM approx. 2150 J / g and KPIC approx. 2750 J / g.

[0019] However, the ESD sensitivity, for example, changes abruptly when measured in an OZM-ESD measuring device: KDNBF approx. 1 mJ, CUPIM 135 mJ and KPIC approx. 67 mJ. Likewise, the mechanical safety, measured by the criteria of friction sensitivity and impact sensitivity, is improved scalably in the mixtures.

[0020] Friction sensitivity (BAM friction apparatus) Impact resistance (BAM drop hammer)

[0021] KDNBF 2 N 0.75 N

[0022] KPIC 170 N 3 N

[0023] CuPIM 360 N 4 N

[0024] This results in improved insensitivity to ESD, friction, and drop hammer stress compared to KDNBF as a single component, while simultaneously creating the possibility of scalable variation in ignition sensitivity. This, in turn, is important for tailoring the performance of an ignition system to the requirements of specific applications.

[0025] KDNBF, when present as a single component, generally exhibits limited temperature resistance and relatively high sensitivity to ESD, impact, and friction, which complicates its simple, unrestricted use in ignition systems and igniters. For this reason, other substances are added to adjust the desired physical properties and, if necessary, adapt them to specific requirements. By adding KPIC and CUPIM in a specific ratio, sensitivity to ESD, friction, and drop hammer stress is significantly reduced, while maintaining ignition capability and increasing temperature resistance and mechanical strength.

[0026] One embodiment of the present invention therefore provides a binary or ternary pyrotechnic mixture of KDNBF, KPIC, and CUPIM. In a further embodiment of the invention, the ternary mixture of the pyrotechnic mixture can, in one embodiment, have a composition of 10 wt.% CUPIM, 80 wt.% KDNBF, and 10 wt.% KPIC, whereby a comparable all-fire ignition current can be achieved with primers compared to leaded primers. With primers of resistance class 1.5 ohms, an ignition current of 450 mA is achieved.

[0027] According to another embodiment, the ternary mixture of the pyrotechnic mixture can consist of 10 wt% CUPIM, 10 wt% KDNBF, and 80 wt% KPIC, whereby a higher no-fire current can be achieved with primers compared to leaded primers. With primers of resistance class 1.5 ohms, a no-fire current of 800 mA is achieved.

[0028] In another embodiment, the ternary mixture of the pyrotechnic blend can have a composition of 80 wt% CUPIM, 10 wt% KDNBF, and 10 wt% KPIC, resulting in a higher no-fire current for ignition pellets compared to leaded ignition compounds. Furthermore, the significantly improved ESD sensitivity greatly enhances handling safety in production and application. For ignition pellets with a resistance of 0.1 ohms, a no-fire current of 8000 mA is achieved.

[0029] Conventional methods for producing suspensions of pyrotechnic mixtures, such as the classic dipping method, have the disadvantage that the wetting behavior of the suspension into which the mixture is dipped is not always sufficient to maintain adequate thermal contact with the ignition bridge and thus ensure process stability. Therefore, it is also an object of the invention to provide a method for producing a suspension that enables the application of a aforementioned igniter or ignition agent to an ignition carrier of an ignition system, with improved wetting and sedimentation properties of the suspension.

[0030] This is achieved in ternary mixtures according to the invention by keeping the components of the pyrotechnic mixture in suspension in energetic binders or non-energetic binder solutions, or by using one of the components as a seed crystal in a precipitation process for the formation of the precipitate of the further component, or by having one of the components present as a solution in which the further component(s) are suspended and a fine granulate is produced by spray drying, which is subsequently processed into a processable suspension in a binder solution. The suspension is then used for application to ignition carriers. The methods according to the invention improve the wetting behavior of the suspension compared to conventional methods.

[0031] This process can utilize energetic binders, such as nitrocellulose, or non-energetic binder solutions, such as Viton, PVB, or PVA, solvent-free epoxy resins, which typically exhibit plastic / thixotropic flow behavior. The pyrotechnic mixtures dissolved in these binders can be produced by homogenizing the substances manufactured as individual components. The resulting individual components are micronized before or after homogenization to ensure sufficiently stable wetting behavior and thermal contact with the annealing bridge, and to guarantee process stability even in high-volume production.

[0032] It has proven advantageous to apply a suspension for coating an ignition carrier of an ignition system. The suspension described above is particularly suitable for this purpose due to its rheological and physical properties. One embodiment of the present invention therefore also relates to a method for coating an ignition carrier of an ignition system, in which a suspension as described above is used for application to the ignition carrier.

[0033] The application can be carried out in any common way; in one embodiment of the invention, the application can therefore be carried out by dipping, spraying, dripping, or screen printing.

[0034] A further objective of the invention is to provide, in particular, ignition pills and detonators which make it possible to ignite secondary explosives, such as PETN, without charging with lead compounds.

[0035] According to the invention, ignition systems are provided to solve this further problem, comprising an ignition carrier, an ignition element, and a power element, wherein the ignition element comprises the pyrotechnic mixtures described above. This can, in particular, be an ignition and ignition pellet, and the ignition carrier can be a hot-bridge carrier or a semiconductor element. Compared to conventional ignition systems, the described ignition systems are lead-free, thus protecting the environment. In addition, said ignition systems possess the aforementioned improved physical properties of the pyrotechnic mixtures.

[0036] Pyrotechnic mixtures are frequently used for ignition components in ignition systems; however, they often have the disadvantages described above regarding physical properties, such as limited temperature resistance or relatively high ESD sensitivity. With the aid of the pyrotechnic mixtures according to the invention, these physical properties can be adapted and improved accordingly. The present invention thus relates to an ignition system comprising an ignition carrier, an ignition component, and a power component, wherein the ignition component comprises a pyrotechnic mixture according to the invention.

[0037] The ignition system can be any common type of ignition system; in one embodiment of the invention, it is an ignition pill or an ignition pill.

[0038] There are many options for ignition in an ignition system, all of which deliver the desired result. Common activation methods include electrical, mechanical, and thermal activation. Electrical activation has proven particularly easy to handle. Among the electrical methods, the annealing bridge technology offers significant advantages in terms of precision and ignition effectiveness. In this technology, an annealing bridge serves as the ignition carrier. Another embodiment of the present invention can therefore be an ignition system in which the ignition carrier is an annealing bridge carrier. The annealing bridge can be implemented as a wire or as a foil with resistance values ​​within the specified limits.

[0039] Other proven methods are also available among electrical activation technologies. Therefore, in another embodiment of the present invention, an ignition system is provided which has an ignition carrier formed by a semiconductor with a pn junction.

[0040] For safety and logistical reasons, the electrical activation technology can be further adapted and extended to include a igniter carrier in a glass-to-metal sealed (GTMS) design, acting as a filament bridge wire. This results in safer and simpler handling compared to other methods. The pyrotechnic mixture according to the invention is applied to the igniter carrier, for example, in dry form using suitable methods. The present invention therefore also relates to an ignition system comprising an igniter carrier that is present in a GTMS component as a filament bridge wire within a pole carrier, wherein the layer surrounding the filament bridge wire is applied to the filament bridge wire / igniter carrier by mechanically pressing the dried mixture or by applying a liquid suspension via drop or screen printing.

[0041] The pyrotechnic mixtures according to the invention can be designed, by applying the corresponding net explosive mass (NEM), to directly detonate a secondary explosive in a detonator. Alternatively, an additional combination of metal powders and / or metal oxides can be incorporated into the pyrotechnic mixture as a mixture or alloy to ensure a sufficient NEM. The typical metals commonly used in pyrotechnics are employed in appropriately formulated powder form, preferably aluminum, gold metals, boron, calcium silicide, iron, hafnium, copper, magnesium, manganese, titanium, tungsten, or zirconium. The oxides or perchlorates of these metals are typically used as additional oxidizing agents, and these oxidizing agents are also incorporated into the mixture.In a further embodiment of the invention, it can therefore also be provided that the pyrotechnic mixture additionally comprises metal powder and / or metal oxide combinations, so that the ignition system has a net explosive mass suitable for directly igniting a secondary explosive.

[0042] Brief description of the drawings

[0043] With reference to the enclosed drawings, the invention is explained using exemplary embodiments, showing:

[0044] - Fig. 1 a schematic representation of an ignition system in the form of a detonator according to the prior art with an embodiment of the pyrotechnic mixture according to the invention;

[0045] - Fig. 2 a triangle diagram of further embodiments of the pyrotechnic mixture according to the invention and

[0046] - Figs. 3A, 3B, 3C show various annealing bridges as a resistance element in the form of wire or foil according to the prior art; with reference to Fig. 1, an ignition pellet has two parallel connection pins 1 arranged at a distance from each other, which are held by means of a plastic clip 2. The ends of the connection pins 1 are bridged with an annealing bridge 3, which comprises, for example, NiCr80 / 20, NiCr60 / 40, or Pt alloys.

[0047] The annealing bridge 3 is surrounded by a layer of a pyrotechnic material according to the invention – an ignition element (primary element) 4 – encasing the annealing bridge wire. This, along with the connection pins, is surrounded by a further layer – a power element (secondary element) 5. This is completely encased in a spherical form with a diffusion barrier 6. To protect against environmental influences, a protective coating 7 is applied around the plastic clip 2, the protruding part of the connection pins 1, and the diffusion barrier 6.

[0048] Fig. 2 shows a triangular diagram of the binary or ternary pyrotechnic mixture with three different compositions according to the invention, wherein one of the components may have a proportion of zero.

[0049] Example 1

[0050] Pyrotechnic mixture: Ternary mixture of 10 wt% CUPIM, 80 wt% KDNBF, and 10 wt% KPIC. Additional additives, etc., may be present. A triangular diagram showing the composition of this embodiment is shown in Fig. 2.

[0051] Example 2

[0052] Pyrotechnic mixture: Ternary mixture of 10 wt% CUPIM, 10 wt% KDNBF and 80 wt% KPIC. Additional additives, etc., may be included. A triangular diagram showing the composition of this further embodiment is shown in Fig. 2.

[0053] Example 3 Pyrotechnic mixture: Ternary mixture of 80 wt.% CUPIM, 10 wt.% KDNBF and 10 wt.% KPIC. Additional additives, etc., may be included. A triangular diagram showing the composition of this further embodiment is shown in Fig. 2.

[0054] Example 4

[0055] Methods for the production of suspensions:

[0056] Pyrotechnic mixture: Ternary mixture of equal parts CUPIM, KDNBF, and KPIC. May also contain additives, etc. A triangular diagram showing the composition of this further embodiment is shown in Fig. 2.

[0057] Example 5

[0058] Methods for the production of suspensions:

[0059] Pyrotechnical mixture: Ternary mixture of CUPIM, KDNBF, and KPIC. One of the components (CUPIM, KDNBF, and KPIC) is used as a seed crystal in a precipitation process to form the precipitates of the other components. Specifically, by placing KDNBF crystals in a suspension, these can be coated with CUPIM or KPIC by carrying out the precipitation process in the suspension.

[0060] Example 6

[0061] Methods for the production of suspensions:

[0062] Pyrotechnic mixture: Ternary mixture of CUPIM, KDNBF, and KPIC. One of the components (CUPIM, KDNBF, and KPIC) is present as a solution in which the other components are suspended. A fine granulate is produced by spray drying. This is subsequently processed into a usable suspension in a binder solution. Example 7

[0063] Methods for the production of suspensions:

[0064] Pyrotechnic mixture: Ternary mixture of CUPIM, KDNBF, and KPIC. A pre-prepared, dispersible suspension of single-walled carbon nanotubes is added to the mixture to act as a sedimentation suppressant and homogenizing agent. The concentration of the carbon nanotubes (based on the solids content in wt.%) is between 0.001% and 2%, preferably between 0.01% and 0.7%.

[0065] Example 8

[0066] Methods for the production of suspensions:

[0067] Pyrotechnic mixture: Ternary mixture of CUPIM, KDNBF, and KPIC. A pre-fabricated masterbatch of nanodiamonds (max. 2 nanometers, typically produced by detonation synthesis) is added to the suspension to moderate the ignition delay time through heat dissipation, thanks to their superior thermal conductivity of 2000 W / mK, even compared to metals. The nanodiamond concentration (based on the solids content) is between 0.1% and 12%, preferably between 0.5% and 6%.

[0068] Example 9

[0069] Method for coating an ignition carrier:

[0070] Suspension of pyrotechnic mixture: Ternary mixture of CUPIM, KDNBF, and KPIC. A resistive element in the form of a resistive foil with a resistance of 0.1 ohms to 20 ohms serves as the detonator. One of the suspensions according to the invention is applied to the detonator using one of the following methods:

[0071] Dive

[0072] Spraying, dripping

[0073] screen printing

[0074] Press

[0075] Example 10

[0076] Ignition system:

[0077] Pyrotechnic mixture for a percussion cap as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF, and KPIC. The igniter bridge 3, for example, made of typical igniter bridge wire alloys such as NiCr80 / 20. Ignition system 10 with igniter bridge 3, igniter 4, and power pack 5. The igniter 4 comprises the pyrotechnic mixture according to the invention, for example, as described in embodiments 1, 2, 3, and 4.

[0078] Example 11

[0079] Ignition system:

[0080] Pyrotechnic mixture for an ignition system 10 as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF and KPIC. Ignition system 10 with ignition carrier 3, ignition element 4 and power element 5. The ignition element 4 comprises the pyrotechnic mixture according to the invention, e.g. according to embodiments 1, 2 and 3, and the ignition system 10 is an ignition pellet.

[0081] Example 12

[0082] Ignition system:

[0083] Pyrotechnic mixture for an ignition system 10 as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF, and KPIC. Ignition system 10 with ignition carrier 3, igniter 4, and power pack 5. The igniter 4 comprises the pyrotechnic mixture according to the invention, e.g., according to embodiments 1 to 8. The ignition carrier 3 is a filament wire in any embodiment (Fig. 3A, Fig. SB, Fig. 3C). Embodiment 13

[0084] Ignition system:

[0085] Pyrotechnic mixture for an ignition system 10 as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF and KPIC, ignition element 4 and power element 5. The ignition element 4 comprises the pyrotechnic mixture according to the invention, e.g. according to embodiments 1, 2 and 3. The ignition carrier 3 is formed by a semiconductor with a pn junction.

[0086] Example 14

[0087] Ignition system:

[0088] Pyrotechnic mixture for an ignition system 10 as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF, and KPIC. Ignition system 10 with ignition element 4 and power element 5. The ignition element 4 comprises the pyrotechnic mixture according to the invention, e.g., according to embodiments 1, 2, and 3. The ignition carrier 3 is located in a GTMS component as a filament wire within a pole carrier. The layer surrounding the filament wire is applied to the filament wire / ignition carrier by mechanical pressing, dipping, dripping, or screen printing.

[0089] Example 15

[0090] Ignition system:

[0091] Pyrotechnic mixture for an ignition system 10 as shown in Fig. 1: Ternary mixture of CUPIM, KDNBF, and KPIC. Copper ignition carrier. Ignition system with ignition carrier, igniter, and power charge. The igniter comprises the pyrotechnic mixture. The pyrotechnic mixture additionally contains an adapted amount of metal powder and / or metal oxide combinations, such that the ignition system has a net explosive mass sufficient to directly ignite a secondary explosive. The ternary mixtures according to the invention also function as a binary mixture: using the above-described

[0092] In exemplary embodiments, desired properties can also be achieved using binary mixtures by omitting one of the components.

[0093] In the case of electronic igniters, especially an ignition pill on a circuit board that is ignited by charged capacitors, it is desirable, depending on the application requirements, to be able to vary the ignition voltage (functionality) or non-ignition voltage (safety feature).

[0094] Example 16

[0095] The invention also includes the fact that one component of the ternary mixture according to the invention has a proportion of zero, thereby achieving a specific ignition sensitivity within a desired property profile: By mixing a binary mixture of 50 wt% KDNBF and 50 wt% CUPIM, for example, a reliable no-fire voltage of 12 V can be set in electronic igniters with the aid of the aforementioned modifiers, nanodiamonds or single-wall nanotubes, or suitable binders in an electronic igniter in the embodiment of an igniter with a resistance of 4.5 ohms – using a 22 µF capacitor. Simultaneously, a reliable all-fire voltage of 14 V can be set with this mixture.

[0096] With this same mixture, a reliable non-ignition voltage of 8.7 V can be set in the 5.5 ohm ignition pill embodiment, using, for example, a 22 µF capacitor. Simultaneously, a reliable ignition voltage of 12.0 V can be set with this mixture.

[0097] Exemplary embodiment 17 The invention also includes the fact that one component of the ternary mixture according to the invention has a proportion of zero, whereby a certain ignition sensitivity can be achieved in a desired property profile:

[0098] By mixing a binary mixture of 50 wt% KDNBF and 50 wt% KPIC, a reliable non-ignition voltage of 10.3 V can be set in electronic igniters with the aid of the aforementioned modifiers, nanodiamonds or single-wall nanotubes, or suitable binders in an electronic igniter with a 4.5 ohm igniter configuration – using, for example, a 22 µF capacitor. Simultaneously, a reliable ignition voltage of 12.3 V can be set with this mixture.

[0099] With this same mixture, a reliable non-ignition voltage of 10 V can be set in the 5.5 ohm ignition pill embodiment, using, for example, a 22 µF capacitor. Simultaneously, a reliable ignition voltage of 12.4 V can be set with this mixture.

[0100] Example 18

[0101] The invention also includes the fact that one component of the ternary mixture according to the invention has a proportion of zero, whereby a certain ignition sensitivity can be achieved in a desired property profile:

[0102] By mixing a binary mixture of 50 wt% CUPIM and 50 wt% KPIC, a reliable non-ignition voltage of 5 V can be set in electronic igniters, for example, in the embodiment of an igniter with a resistance of 4.5 ohms, using the aforementioned modifiers nanodiamonds or single-wall nanotubes, or suitable binders, and employing, for example, a 134 µF capacitor. Simultaneously, a reliable ignition voltage of 6.5 V can be set with this mixture. With the same mixture, a reliable non-ignition voltage of 4.1 V can be achieved in the embodiment of an igniter with a resistance of 5.5 ohms, using, for example, a 134 µF capacitor. Simultaneously, a reliable ignition voltage of 5.2 V can be realized with this mixture.

Claims

PATENT CLAIMS 1. Pyrotechnic mixture with potassium benzanate, characterized in that it comprises a binary or ternary mixture comprising at least two selected from potassium benzanate, copper picramate and potassium picrate.

2. Mixture according to claim 1, characterized in that the ternary mixture consists of 10 wt% copper picramate, 80 wt% potassium benzanate and 10 wt% potassium picrate.

3. Mixture according to claim 1, characterized in that the ternary mixture consists of 10 wt% copper picramate, 10 wt% potassium benzanate and 80 wt% potassium picramate.

4. Mixture according to claim 1, characterized in that the ternary mixture consists of 80 wt% copper picramate, 10 wt% potassium benzanate and 10 wt% potassium picrate.

5. A method for producing a suspension containing a pyrotechnic mixture according to any one of claims 1 to 4, characterized in that a) the components of the pyrotechnic mixture are suspended in energetic binders or non-energetic binder solutions, or b) one of the components is used as a seed crystal in a precipitation process for the formation of the other components, or c) that one of the components is present as a solution and the other component(s) are suspended in it and a fine granulate is produced by spray drying, which is subsequently processed into a processable suspension in a binder solution.

6. Method for coating an ignition carrier of an ignition system, characterized in that a suspension according to claim 5 is used for application to the ignition carrier.

7. Method according to claim 6, characterized in that the application is carried out by dipping, spraying, dripping, screen printing or pressing.

8. Ignition system comprising an ignition carrier, an ignition element and a power element, characterized in that the ignition element comprises a pyrotechnic mixture according to any one of claims 1 to 7.

9. Ignition system according to claim 8, characterized in that the ignition system is an ignition pellet or an ignition pellet.

10. Ignition system according to claim 8, characterized in that the ignition carrier is a hot bridge carrier.

11. Ignition system according to claim 8, characterized in that the ignition carrier is formed by a semiconductor.

12. Ignition system according to claim 8, wherein the ignition carrier is provided in a GTMS (glass-to-metal-sealed) component as a filament bridge wire in a pole carrier, characterized in that the filament surrounding the filament bridge wire The pyrotechnic mixture is applied to the igniter wire / ignition carrier by mechanically pressing the dried mixture, or by applying a liquid suspension, by means of drops or screen printing.

13. Ignition system according to claim 8, characterized in that the pyrotechnic mixture additionally includes metal powders and / or metal oxide combinations, such that the ignition system has a net explosive mass suitable for directly igniting a secondary explosive, typically PETN, Hexogen, Octogen, HNS, or mixtures made therefrom, with or without binders / additives.

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