EP0260419A2 - Combustible propellant cartridge case with an improved temperature resistance - Google Patents

Combustible propellant cartridge case with an improved temperature resistance Download PDF

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Publication number
EP0260419A2
EP0260419A2 EP87111101A EP87111101A EP0260419A2 EP 0260419 A2 EP0260419 A2 EP 0260419A2 EP 87111101 A EP87111101 A EP 87111101A EP 87111101 A EP87111101 A EP 87111101A EP 0260419 A2 EP0260419 A2 EP 0260419A2
Authority
EP
European Patent Office
Prior art keywords
coating
propellant charge
temperature resistance
charge container
cartridge case
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87111101A
Other languages
German (de)
French (fr)
Other versions
EP0260419A3 (en
EP0260419B1 (en
Inventor
Johannes Eich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel Defence GmbH
Original Assignee
Dynamit Nobel AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Publication of EP0260419A2 publication Critical patent/EP0260419A2/en
Publication of EP0260419A3 publication Critical patent/EP0260419A3/en
Application granted granted Critical
Publication of EP0260419B1 publication Critical patent/EP0260419B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/18—Caseless ammunition; Cartridges having combustible cases
    • F42B5/192—Cartridge cases characterised by the material of the casing wall
    • F42B5/196—Coatings
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones

Definitions

  • the present invention is concerned with combustible propellant containers, such as sleeves or cartridges, whose temperature resistance is improved. At the same time, mechanical properties of these containers are also improved.
  • the object was therefore to develop combustible containers for propellant charge powders which are as temperature-resistant as possible and at the same time have mechanical property values which are at least equivalent to those of known containers. Furthermore, the container should burn off without residues and not negatively affect the energy balance of the entire combustion system.
  • combustible propellant charge containers which are provided with a surface coating and are characterized by a coating with a nitramine known as an explosive and which is embedded in a binder.
  • nitramines to be used are those which are known per se as explosives, have a detonation speed of more than 7,400 m / s and, when burned, deliver a high normal gas volume, preferably more than 650 l / kg (measured by the CIT method). Furthermore, they should have deflagration points above 200 ° C, preferably above 230 ° C.
  • Nitramines that meet these conditions are e.g. Cyclotrimethylene trinitramine (hexogen) or the cyclotetramethylene tetramine (octogenes).
  • Suitable liquid binders are those liquid resins which have a desensitizing effect on the nitramines, so that they do not detonate, but rather uniformly burn down. The resins are also said to cure when standing in the air. Resins with such properties are known per se to the person skilled in the art. Resins based on polyvinyl alcohol, polyvinyl acetal, polybutadiene or polyacrylates may be mentioned as examples.
  • the proportion of binders in the coating can vary between 5 and 20% by weight, depending on the type of resin used. It is preferably between 10 and 15% by weight, especially if a polyvinyl acetal resin is used as the binder.
  • the thickness of the coatings depends on the respective application and the components used; it can vary between 0.1 and 1.0 mm, preferably it is between 0.2 and 0.5 mm.
  • the application is carried out in a manner known per se, optionally dissolved in a suitable solvent, e.g. by spraying, dipping, rolling or brushing.
  • the application can be carried out both on the sleeve which has not yet been processed as well as on a sleeve which has already been provided with a load and a projectile.
  • the lacquer to be applied may also contain a plasticizer known per se.
  • the coating according to the invention is always on the outer surfaces of the containers. It can also be attached to the inner wall. In any case, it burns together with the container.
  • the containers which are coated according to the invention are known per se to the person skilled in the art. These are both flammable sleeves or cartridges as well as containers that can be used instead of bag loads.
  • the containers preferably have a central tube for receiving an ignition reinforcement and are cylindrical or slightly conical.
  • the coating according to the invention improves the cook-off behavior of the sleeves; it also protects the sleeves from the ingress of moisture and also improves the mechanical properties of the sleeves, e.g. the tensile strength, impact and impact resistance.
  • a cartridge made with this sleeve moves without residue when fired in the weapon.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Paints Or Removers (AREA)

Abstract

For propellant cartridge cases coated with nitramines and a binder, the coating is applied in the form of a paint, for example in a solvent. The cases can mainly be combustible projectile cartridges. As a result of this coating, these cases have a higher self-ignition temperature and their mechanical properties, such as tensile strength, shock resistance and impact resistance, are improved.

Description

Vorliegende Erfindung befaßt sich mit verbrennbaren Treib­ladungsbehältern, wie Hülsen oder Kartuschen, deren Tem­peraturbeständigkeit verbessert ist. Gleichzeitig werden auch mechanische Eigenschaften dieser Behälter verbessert.The present invention is concerned with combustible propellant containers, such as sleeves or cartridges, whose temperature resistance is improved. At the same time, mechanical properties of these containers are also improved.

Es ist aus der DE-PS 27 10 451 bekannt, auf Munitions­hülsen eine oder mehrere Lackschichten aufzubringen, um die mechanischen Eigenschaften dieser Hülsen zu verbes­sern und um die Gefahr einer ungewollten Entzündung der Hülse zu vermindern. Die in dieser Patentschrift beschrie­benen Beschichtungen lösen jedoch das Problem der Tempe­raturbeständigkeit solcher Hülsen z.B. in solchen Fällen nicht, bei denen diese in heißgeschossenen Verbrennungs­räumen, wie z.B. in den Patronenlagern von Schnellfeuer­waffen, zum Einsatz kommen. Dort können dann leicht Selbst­entzündungen - auch als cook-off bezeichnet - auftreten.It is known from DE-PS 27 10 451 to apply one or more layers of lacquer to ammunition cases in order to improve the mechanical properties of these cases and to reduce the risk of undesired ignition of the case. The coatings described in this patent, however, do not solve the problem of the temperature resistance of such sleeves, for example in those cases in which they are used in hot-shot combustion chambers, such as, for example, in the cartridge chambers of rapid-fire weapons. Self-ignition - also known as cook-off - can easily occur there.

Ein weiterer Nachteil dieser bekannten Beschichtungen besteht darin, daß diese in vielen Fällen nicht rück­standslos verbrennen, besonders dann, wenn in der Lack­schicht inerte Materialien enthalten sind. Deshalb wird von vielen bekannten Beschichtungen die Energiebilanz des gesamten Systems negativ beeinflußt.Another disadvantage of these known coatings is that in many cases they do not burn without residue, especially if the coating layer contains inert materials. For this reason, many known coatings have a negative impact on the energy balance of the entire system.

Es bestand deshalb die Aufgabe, verbrennbare Behälter für Treibladungspulver zu entwickeln, die möglichst temperaturbeständig sind und gleichzeitig mechanische Eigenschaftswerte besitzen, die denjenigen von bekann­ten Behältern mindestens gleichwertig sind. Weiterhin soll der Behälter rückstandslos abbrennen und die Ener­giebilanz des gesamten Abbrandsystems nicht negativ be­einflussen.The object was therefore to develop combustible containers for propellant charge powders which are as temperature-resistant as possible and at the same time have mechanical property values which are at least equivalent to those of known containers. Furthermore, the container should burn off without residues and not negatively affect the energy balance of the entire combustion system.

In Erfüllung dieser Aufgabe wurden nun verbrennbare Treibladungsbehälter, die mit einer Oberflächenbeschich­tung versehen sind, gefunden, die durch eine Beschich­tung mit einem als Explosivstoff bekannten Nitramin, das in einem Bindemittel eingebettet ist, gekennzeichnet sind.In fulfilling this task, combustible propellant charge containers have now been found which are provided with a surface coating and are characterized by a coating with a nitramine known as an explosive and which is embedded in a binder.

Die einzusetzenden Nitramine sind solche, die als Explo­sivstoffe an sich bekannt sind, eine Detonationsgeschwin­digkeit über 7 400 m/s besitzen und bei ihrer Verbrennung ein hohes Normalgasvolumen, vorzugsweise über 650 l/kg (gemessen nach der CIT-Methode), liefern. Weiterhin sol­len sie Verpuffungspunkte über 200 °C, vorzugsweise über 230 °C, haben. Nitramine, die diese Bedingungen erfüllen, sind z.B. Cyclotrimethylentrinitramin (Hexogen) oder die Cyclotetramethylentetramine (Oktogene).The nitramines to be used are those which are known per se as explosives, have a detonation speed of more than 7,400 m / s and, when burned, deliver a high normal gas volume, preferably more than 650 l / kg (measured by the CIT method). Furthermore, they should have deflagration points above 200 ° C, preferably above 230 ° C. Nitramines that meet these conditions are e.g. Cyclotrimethylene trinitramine (hexogen) or the cyclotetramethylene tetramine (octogenes).

Als Bindemittel eignen sich solche flüssigen Harze, die eine phlegmatisierende Wirkung auf die Nitramine aus- üben, so daß diese nicht detonieren, sondern gleichmäßig abbrennen. Weiterhin sollen die Harze beim Stehen an der Luft aushärten. Harze mit solchen Eigenschaften sind dem Fachmann an sich bekannt. Als Beispiele seien Harze auf Basis von Polyvinylalkohol, Polyvinylacetal, Polybuta­dien oder Polyacrylaten genannt.Suitable liquid binders are those liquid resins which have a desensitizing effect on the nitramines, so that they do not detonate, but rather uniformly burn down. The resins are also said to cure when standing in the air. Resins with such properties are known per se to the person skilled in the art. Resins based on polyvinyl alcohol, polyvinyl acetal, polybutadiene or polyacrylates may be mentioned as examples.

Der Anteil der Bindemittel in der Beschichtung kann, je nach Art der verwendeten Harze, zwischen 5 und 20 Gew.-% variieren. Bevorzugt liegt er zwischen 10 und 15 Gew.-%, besonders wenn als Bindemittel ein Polyvinylacetalharz eingesetzt wird.The proportion of binders in the coating can vary between 5 and 20% by weight, depending on the type of resin used. It is preferably between 10 and 15% by weight, especially if a polyvinyl acetal resin is used as the binder.

Die Dicke der Beschichtungen richtet sich nach dem jewei­ligen Anwendungsfall und den eingesetzten Bestandteilen; sie kann zwischen 0,1 und 1,0 mm schwanken, vorzugsweise liegt sie zwischen 0,2 und 0,5 mm. Das Aufbringen erfolgt auf an sich bekannte Weise, ggf. in einem geeigneten Lö­sungsmittel gelöst, z.B. durch Spritzen, Tauchen, Walzen oder Pinseln. Das Aufbringen kann sowohl auf die noch nicht weiterverarbeitete Hülse als auch auf eine bereits mit Ladung und Geschoß versehene Hülse durchgeführt werden. Der aufzubringende Lack kann weiterhin auch noch einen an sich bekannten Weichmacher enthalten.The thickness of the coatings depends on the respective application and the components used; it can vary between 0.1 and 1.0 mm, preferably it is between 0.2 and 0.5 mm. The application is carried out in a manner known per se, optionally dissolved in a suitable solvent, e.g. by spraying, dipping, rolling or brushing. The application can be carried out both on the sleeve which has not yet been processed as well as on a sleeve which has already been provided with a load and a projectile. The lacquer to be applied may also contain a plasticizer known per se.

Die erfindungsgemäße Beschichtung befindet sich immer auf den Außenflächen der Behälter. Sie kann auch an der Innenwand angebracht werden. In jedem Fall verbrennt sie zusammen mit dem Behälter.The coating according to the invention is always on the outer surfaces of the containers. It can also be attached to the inner wall. In any case, it burns together with the container.

Die Behälter, die erfindungsgemäß beschichtet sind, sind dem Fachmann an sich bekannt. Es handelt sich dabei so­wohl um verbrennbare Hülsen oder Kartuschen als auch um solche Behälter, die anstelle von Beutelladungen einge­setzt werden können. Die Behälter haben vorzugsweise ein zentrales Rohr zur Aufnahme einer Anzündverstärkung und sind zylindrisch oder leicht konisch ausgebildet.The containers which are coated according to the invention are known per se to the person skilled in the art. These are both flammable sleeves or cartridges as well as containers that can be used instead of bag loads. The containers preferably have a central tube for receiving an ignition reinforcement and are cylindrical or slightly conical.

Die erfindungsgemäße Beschichtung verbessert das cook-­off-Verhalten der Hülsen; sie schützt weiterhin die Hülsen vor eindringender Feuchtigkeit und verbessert auch die mechanischen Eigenschaften der Hülsen, wie z.B. die Reißfestigkeit, Stoß- und Schlagfestigkeit.The coating according to the invention improves the cook-off behavior of the sleeves; it also protects the sleeves from the ingress of moisture and also improves the mechanical properties of the sleeves, e.g. the tensile strength, impact and impact resistance.

Beispielexample

Es werden 85 Gew.-Teile Hexogen zusammen mit 12 Gew.-­Teilen eines Acrylatharzes, das unter dem Namen PLEXTOL M 600 der Firma Röhm, Darmstadt, im Handel ist, und 3 Gew.-Teilen Dioctylphthalat in 30 Gew.-Teile Toluol eingerührt. Die dabei erhaltene Paste wird auf eine verbrennbare Patronenhülse aufgespachtelt und mit einem Kalibrierwerkzeug auf eine Dicke von 0,2 mm ein­gestellt. Die nach dem Trocken der aufgebrachten Schicht erhaltene Hülse hat eine Selbstentzündungstemperatur von ca. 240 °C.85 parts by weight of hexogen together with 12 parts by weight of an acrylate resin, which is commercially available under the name PLEXTOL M 600 from Röhm, Darmstadt, and 3 parts by weight of dioctyl phthalate are stirred into 30 parts by weight of toluene . The paste obtained is filled onto a combustible cartridge case and adjusted to a thickness of 0.2 mm using a calibration tool. The sleeve obtained after the applied layer has dried has a self-ignition temperature of approximately 240 ° C.

Eine mit dieser Hülse gefertigte Patrone setzt sich beim Schuß in der Waffe rückstandslos um.A cartridge made with this sleeve moves without residue when fired in the weapon.

Claims (6)

1. Verbrennbarer, mit einer Oberflächenbeschichtung ver­sehener Treibladungsbehälter, gekennzeich­net durch eine Beschichtung mit einem als Explosivstoff bekannten Nitramin, das in einem Binde­mittel eingebettet ist.1. Flammable propellant charge container provided with a surface coating, characterized by a coating with a nitramine known as an explosive, which is embedded in a binder. 2. Treibladungsbehälter gemäß Anspruch 1, dadurch gekenn­zeichnet, daß der Anteil des Nitramins in der Beschich­tung zwischen 80 und 95 Gew.-% beträgt.2. propellant charge container according to claim 1, characterized in that the proportion of nitramine in the coating is between 80 and 95 wt .-%. 3. Treibladungsbehälter gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Nitramin ein solches eingesetzt ist, das einen Verpuffungspunkt über 200 °C besitzt.3. propellant charge container according to claim 1 or 2, characterized in that the nitramine used is one which has a deflagration point above 200 ° C. 4. Treibladungsbehälter gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Nitramin Hexogen ist.4. propellant charge container according to one of claims 1 to 3, characterized in that the nitramine is hexogen. 5. Treibladungsbehälter gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Bindemittel ausgewählt ist aus der Gruppe Polyvinylalkohol, Polyvinylacetal, Polybutadien oder Polyacrylat.5. propellant charge container according to one of claims 1 to 4, characterized in that the binder is selected from the group polyvinyl alcohol, polyvinyl acetal, polybutadiene or polyacrylate. 6. Treibladungsbehälter gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß er als Hülse zur Aufnahme von Geschossen ausgebildet ist.6. propellant charge container according to one of claims 1 to 5, characterized in that it is designed as a sleeve for receiving projectiles.
EP87111101A 1986-09-03 1987-07-31 Combustible propellant cartridge case with an improved temperature resistance Expired - Lifetime EP0260419B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863630019 DE3630019A1 (en) 1986-09-03 1986-09-03 COMBUSTIBLE DRIVE CHARGE TANK WITH IMPROVED TEMPERATURE RESISTANCE
DE3630019 1986-09-03

Publications (3)

Publication Number Publication Date
EP0260419A2 true EP0260419A2 (en) 1988-03-23
EP0260419A3 EP0260419A3 (en) 1989-10-04
EP0260419B1 EP0260419B1 (en) 1993-01-27

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EP87111101A Expired - Lifetime EP0260419B1 (en) 1986-09-03 1987-07-31 Combustible propellant cartridge case with an improved temperature resistance

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EP (1) EP0260419B1 (en)
DE (2) DE3630019A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250739A (en) * 1988-09-10 1992-06-17 Diehl Gmbh & Co Propellant for a hybrid weapon
FR2680413A1 (en) * 1991-08-16 1993-02-19 Eidgenoess Munitionsfab Thun METHOD FOR IMPROVING THE MECHANICAL LOAD CAPACITY OF AMMUNITION BODIES WHICH, HIGHLY ACCELERATED AND / OR SUBJECT TO SHOCK WAVES, CONTAIN HOLLOW LOADS, AND USE OF THE METHOD.
FR2686970A1 (en) * 1988-07-28 1993-08-06 Dynamit Nobel Ag FUEL CARTRIDGE SOCKET.
EP0787701A3 (en) * 1990-08-31 1998-04-08 Olin Corporation Elastomer-containing casings for propellants
FR2928917A1 (en) * 2008-03-21 2009-09-25 Eurenco France Sa Liquid composition, useful as a precursor for finish coating of pyrotechnic filler, comprises energetic filler in a crosslinkable plastic binder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927616A (en) * 1974-04-23 1975-12-23 Us Army Combustible cartridge case
FR2294421A1 (en) * 1974-12-12 1976-07-09 Saint Louis Inst Thermal effects resisting combustible envelope for propellant charge - consists of plastics foam with secondary explosives
EP0012690A1 (en) * 1978-12-15 1980-06-25 Societe Nationale Des Poudres Et Explosifs Combustible objects, in particular heat-resistant combustible cartridge cases
FR2590013A1 (en) * 1985-11-12 1987-05-15 France Etat Armement PROTECTIVE VARNISH AGAINST THERMO-INITIATION OF SUNLESS OR FUEL-SLEEVE MUNITION

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710451C2 (en) * 1977-03-10 1990-11-15 Rheinmetall GmbH, 4000 Düsseldorf Surface protection coating for ammunition with a combustible case or caseless ammunition
DE2843477A1 (en) * 1978-10-05 1980-04-17 Dynamit Nobel Ag Solid propellant charge - contg. polymeric binder and reinforcing fibres, e.g. cellulosic fibres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927616A (en) * 1974-04-23 1975-12-23 Us Army Combustible cartridge case
FR2294421A1 (en) * 1974-12-12 1976-07-09 Saint Louis Inst Thermal effects resisting combustible envelope for propellant charge - consists of plastics foam with secondary explosives
EP0012690A1 (en) * 1978-12-15 1980-06-25 Societe Nationale Des Poudres Et Explosifs Combustible objects, in particular heat-resistant combustible cartridge cases
FR2590013A1 (en) * 1985-11-12 1987-05-15 France Etat Armement PROTECTIVE VARNISH AGAINST THERMO-INITIATION OF SUNLESS OR FUEL-SLEEVE MUNITION

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686970A1 (en) * 1988-07-28 1993-08-06 Dynamit Nobel Ag FUEL CARTRIDGE SOCKET.
GB2250739A (en) * 1988-09-10 1992-06-17 Diehl Gmbh & Co Propellant for a hybrid weapon
US5188682A (en) * 1988-09-10 1993-02-23 Diehl Gmbh & Co. Propellent medium for hybrid weapon
EP0787701A3 (en) * 1990-08-31 1998-04-08 Olin Corporation Elastomer-containing casings for propellants
FR2680413A1 (en) * 1991-08-16 1993-02-19 Eidgenoess Munitionsfab Thun METHOD FOR IMPROVING THE MECHANICAL LOAD CAPACITY OF AMMUNITION BODIES WHICH, HIGHLY ACCELERATED AND / OR SUBJECT TO SHOCK WAVES, CONTAIN HOLLOW LOADS, AND USE OF THE METHOD.
US5353709A (en) * 1991-08-16 1994-10-11 Schweizerische Eidgenossenschaft Vertreten Durch Die Eidg. Munitionsfabrik Altdorf Der Gruppe Fuer Ruestungsdienste Method for improving the mechanical stressability of ammunition bodies with shaped charges
FR2928917A1 (en) * 2008-03-21 2009-09-25 Eurenco France Sa Liquid composition, useful as a precursor for finish coating of pyrotechnic filler, comprises energetic filler in a crosslinkable plastic binder

Also Published As

Publication number Publication date
DE3630019C2 (en) 1989-10-12
EP0260419A3 (en) 1989-10-04
DE3630019A1 (en) 1988-03-17
DE3783839D1 (en) 1993-03-11
EP0260419B1 (en) 1993-01-27

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