EP1087919B1 - Gas-generating solid pyrotechnic loads based on compositions containing water - Google Patents
Gas-generating solid pyrotechnic loads based on compositions containing water Download PDFInfo
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- EP1087919B1 EP1087919B1 EP99920902A EP99920902A EP1087919B1 EP 1087919 B1 EP1087919 B1 EP 1087919B1 EP 99920902 A EP99920902 A EP 99920902A EP 99920902 A EP99920902 A EP 99920902A EP 1087919 B1 EP1087919 B1 EP 1087919B1
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- Prior art keywords
- composition according
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- water
- nitrate
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/06—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires containing gas-producing, chemically-reactive components
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B31/00—Compositions containing an inorganic nitrogen-oxygen salt
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B47/00—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
Definitions
- the present invention relates to the field of pyrotechnic compositions generating cold gases, non-toxic and free of solid residues. More precisely the invention relates to the field of solid composite pyrotechnic compositions at amorphous structure comprising one or more oxidants and an organic binder in the gel state.
- the essays according to the invention are well suited to constitute loads intended to inflate cushions protection or to ensure the functioning of a pyrotechnic fire extinguisher.
- cold, non-toxic, residue-free gases solid.
- the term "cold" gases means gases which are products at a temperature below about 1800 ° C.
- liquid propellants consisting of aqueous solutions of compounds such as hydroxylammonium nitrate, triethanolammonium nitrate, aminotetrazole nitrate, nitrate aminotriazole, urea nitrate, biuret nitrate, etc.
- liquid propellants are for example described in US Patents 5,060,973 and US 5,684,269.
- these liquid propellants require suitable gas generators, the structure of which is complex and which are of a high cost price.
- compositions constituted by a binder such as polyvinyl alcohol and by solid eutectics to based on ammonium nitrate and guanidine nitrates or aminoguanidine in the presence of nitrate or potassium perchlorate.
- binder such as polyvinyl alcohol
- solid eutectics to based on ammonium nitrate and guanidine nitrates or aminoguanidine in the presence of nitrate or potassium perchlorate.
- the object of the present invention is precisely to meet this need.
- Polyvinyl alcohol is the preferred binder because it improves the chemical stability of the compositions according to the invention.
- the solid compositions according to the invention thus present an amorphous structure in which the binder is in the form of a solid impregnated gel by the aqueous hydroxylammonium phase.
- the binder is in the form of a solid impregnated gel by the aqueous hydroxylammonium phase.
- the water content by weight of the compositions according to the invention will be between 5 and 20%.
- the invention thus makes it possible to have compositions which contain water contents much higher than the contents in humidity of previously known compositions.
- the weight of the nitrate of hydroxylammonium represents at least 50% of the total weight of the composition, the content of the latter in hydroxylammonium nitrate preferably being between 60% and 70%.
- One of the advantages of the present invention resides in the fact that at the indicated contents the mixtures water / hydroxylammonium nitrate remain liquid from the as long as the temperature does not drop below zero degrees Celsius.
- the compositions according to the invention also contain secondary oxidants which are advantageously chosen in the group consisting of ammonium nitrate, hexogen (RDX) and octogen (HMX). These oxidants allow to increase the number of gaseous molecules produced by the combustion of a given volume of composition without the temperature of combustion gas does not increase too much thanks to the water contained in the composition.
- secondary oxidants which are advantageously chosen in the group consisting of ammonium nitrate, hexogen (RDX) and octogen (HMX).
- compositions when the compositions are intended to constitute loads pyrotechnics for gas generators in front inflate protective cushions for occupants of a motor vehicle, avoid the use of nitrate ammonium or in any case limit the content by weight of the ammonium nitrate composition to a few percent.
- compositions will most often contain stabilizing additives who will be chosen from bipyridine, ammonium hydrogen phosphate and ammonium acetate.
- the weight content of these stabilizers in the composition will be close to 2%.
- Bipyridine and ammonium hydrogen phosphate are stabilizers preferred.
- compositions will contain thickening additives which will be chosen from the group consisting of water-soluble isocyanates, melamine-formaldehyde resins and borax which is a sodium tetraborate of formula: Na 2 B 4 O 7 , 10H 2 O.
- the kneading and extrusion apparatus is a twin-screw extruder.
- the binder with gelling effect is polyvinyl alcohol and the twin-screw extruder is heated to a temperature between 50 ° C. and 60 ° C., the temperature inside the oven being close to 80 ° C.
- all the constituents other than the binder and which are soluble in water will be mixed with the liquid phase containing the water and the hydroxylammonium nitrate before introduction of the latter into the twin-screw extruder.
- the pyrotechnic charges thus obtained can in particular be used either in pyrotechnic extinguishers to constitute the source of engine gas in these fire extinguishers, either in pyrotechnic gas generators intended to inflate protective cushions for vehicle occupants automobile.
- the installation shown in FIG. 1 basically comprises a twin-screw extruder 1 extended by an extrusion head 2, a conveyor belt 3 passing inside an oven 4 and a cutting system 5.
- the first device consists of a pipe 6 connected via a tap 7 to a tank 8 provided with an agitator 9.
- a second device feed consisting of a hopper 10 and a belt carrier 11.
- the tank 8 contains a liquid mixture A consisting with water, hydroxylammonium nitrate and, if applicable constituents other than the binder and soluble in water such as ammonium nitrate.
- the reactive constituents with respect to water are not incorporated into this aqueous liquid phase.
- the conveyor belt 11 feeds the hopper 10 with a mixture of granules B comprising granules of binder and, if necessary, granules of additives not soluble in water and in particular oxidizing granules not soluble in water such as hexogen or octogen.
- Extruder 1 is temperature controlled to have an internal temperature between 50 ° C and 60 ° C when the binder is polyvinyl alcohol.
- the liquid phase A and the granules B are mixed in the extruder 1 to form, by gelation of the binder, a composite paste with an amorphous structure which is extruded through the extrusion head 2 in the form of a profiled rod 12.
- This rod may be a simple cylindrical strand, possibly provided with internal channels, to give, after cutting, loose grains or be a rod of larger dimensions, with, if necessary, a worked external profile, to give after cutting. solid or annular blocks.
- This rod 12 is led through the conveyor belt 3 through a heated oven to cause hardening of the gelled binder.
- the binder is polyvinyl alcohol
- the temperature of the oven will be close to 80 ° C. and the residence time of the rod in the oven will be a few minutes.
- Example 1 Example 2 water 8 15% polyvinyl alcohol 20% 15% hydroxylammonium nitrate 68.5% 66.5% ammonium nitrate 3.5% 3.5%
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Business, Economics & Management (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Emergency Management (AREA)
- Inorganic Chemistry (AREA)
- Air Bags (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Treatment Of Sludge (AREA)
- Glanulating (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
Description
La présente invention se rapporte au domaine des compositions pyrotechniques génératrices de gaz froids, non toxiques et exempts de résidus solides. Plus précisément l'invention concerne le domaine des compositions pyrotechniques composites solides à structure amorphe comprenant un ou plusieurs oxydants et un liant organique à l'état de gel. Les compositions selon l'invention conviennent bien pour constituer des chargements destinés à gonfler des coussins de protection ou à assurer le fonctionnement d'un extincteur pyrotechnique.The present invention relates to the field of pyrotechnic compositions generating cold gases, non-toxic and free of solid residues. More precisely the invention relates to the field of solid composite pyrotechnic compositions at amorphous structure comprising one or more oxidants and an organic binder in the gel state. The essays according to the invention are well suited to constitute loads intended to inflate cushions protection or to ensure the functioning of a pyrotechnic fire extinguisher.
Pour de nombreuses applications comme la sécurité automobile ou la lutte contre les incendies sont recherchées des compositions pyrotechniques génératrices de gaz froids, non toxiques et exempts de résidus solides. On entend par gaz "froids" des gaz qui sont produits à une température inférieure à environ 1800°C.For many applications such as security automobile or fire fighting are sought after pyrotechnic compositions cold, non-toxic, residue-free gases solid. The term "cold" gases means gases which are products at a temperature below about 1800 ° C.
Par ailleurs l'homme de métier souhaite, dans ces
domaines d'applications, pouvoir disposer de
compositions pouvant être fabriquées et mises en forme
par des procédés continus.
Pour obtenir des gaz froids et exempts de résidus
solides, l'homme de métier a recherché à développer des
propergols liquides constitués par des solutions
aqueuses de composés comme le nitrate
d'hydroxylammonium, le nitrate de triéthanolammonium, le
nitrate d'aminotétrazole, le nitrate d'aminotriazole, le
nitrate d'urée, le nitrate de biuret, etc... Furthermore, those skilled in the art wish, in these fields of application, to be able to have available compositions which can be manufactured and shaped by continuous processes.
To obtain cold gases and free of solid residues, the skilled person sought to develop liquid propellants consisting of aqueous solutions of compounds such as hydroxylammonium nitrate, triethanolammonium nitrate, aminotetrazole nitrate, nitrate aminotriazole, urea nitrate, biuret nitrate, etc.
De tels propergols liquides sont par exemple décrits dans les brevets US 5,060,973 et US 5,684,269. Néanmoins ces propergols liquides nécessitent des générateurs de gaz adaptés, dont la structure est complexe et qui sont d'un prix de revient élevé.Such liquid propellants are for example described in US Patents 5,060,973 and US 5,684,269. However, these liquid propellants require suitable gas generators, the structure of which is complex and which are of a high cost price.
Dans le domaine des chargements solides l'homme de métier a cherché à développer dans ce but des compositions composites constituées par un liant comme l'alcool polyvinylique et par des eutectiques solides à base de nitrate d'ammonium et de nitrates de guanidine ou d'aminoguanidine en présence de nitrate ou de perchlorate de potassium. Ces compositions qui sont par exemples décrites dans la demande PCT WO 97/46502 présentent cependant le double inconvénient de ne pas se prêter à une mise en oeuvre en continu puisqu'elles sont mises en forme par compression et, par ailleurs, de fournir des gaz encore relativement chauds.In the field of solid loads the man of profession sought to develop for this purpose composite compositions constituted by a binder such as polyvinyl alcohol and by solid eutectics to based on ammonium nitrate and guanidine nitrates or aminoguanidine in the presence of nitrate or potassium perchlorate. These compositions which are by examples described in PCT application WO 97/46502 have the double disadvantage of not being lend to continuous implementation since they are shaped by compression and, moreover, provide still relatively hot gases.
Enfin dans le domaine de la propulsion solide il a été proposé, par exemple par le brevet US 5,386,777, des chargements solides constitués par un enroulement de feuilles d'alcool polyvinylique imprégnées par un eutectique liquide à base des nitrates précédemment cités, les dits chargements contenant en plus de l'aluminium comme réducteur. Comme la technique précédemment mentionnée, cette solution fournit des gaz trop chauds et ne se prête pas à une mise en oeuvre en continu.Finally in the field of solid propulsion it has been proposed, for example by patent US 5,386,777, solid loads constituted by a winding of polyvinyl alcohol sheets impregnated with a liquid eutectic based on nitrates previously mentioned, the said loads containing in more aluminum as a reducing agent. Like technique previously mentioned, this solution provides gases too hot and not suitable for use in continued.
Il existe donc un besoin non satisfait de compositions pyrotechniques solides qui fournissent par combustion des gaz "froids", non toxiques et exempts de résidus solides et qui puissent être fabriquées et mises en forme en continu. There is therefore an unmet need for solid pyrotechnic compositions which provide by combustion of "cold" gases, non-toxic and free of solid residue that can be manufactured and disposed of continuously shaped.
L'objet de la présente invention est précisément de répondre à ce besoin.The object of the present invention is precisely to meet this need.
L'invention concerne donc des compositions
pyrotechniques solides produisant par combustion des gaz
exempts de résidus solides et constituées par au moins
un liant organique à effet gélifiant et par au moins un
système oxydant principal en phase liquide absorbée par
le dit liant, les dites compositions étant caractérisées
en ce que :
L'alcool polyvinylique est le liant préféré car il améliore la stabilité chimique des compositions selon l'invention.Polyvinyl alcohol is the preferred binder because it improves the chemical stability of the compositions according to the invention.
Les compositions solides selon l'invention présentent ainsi une structure amorphe dans laquelle le liant se présente sous forme d'un gel solide imprégné par la phase aqueuse d'hydroxylammonium. Par combustion ces compositions libèrent l'eau incluse dans le gel sous forme de vapeur d'eau qui contribue à abaisser très sensiblement la température des gaz de combustion. The solid compositions according to the invention thus present an amorphous structure in which the binder is in the form of a solid impregnated gel by the aqueous hydroxylammonium phase. By combustion these compositions release the water included in the gel under form of water vapor which helps to lower very appreciably the temperature of the combustion gases.
La teneur pondérale en eau des compositions selon l'invention sera comprise entre 5 et 20%. L'invention permet ainsi de disposer de compositions qui contiennent des teneurs en eau très supérieures aux teneurs en humidité des compositions antérieurement connues.The water content by weight of the compositions according to the invention will be between 5 and 20%. The invention thus makes it possible to have compositions which contain water contents much higher than the contents in humidity of previously known compositions.
Avantageusement le poids du nitrate d'hyroxylammonium représente au moins 50% du poids total de la composition, la teneur de cette dernière en nitrate d'hydroxylammonium étant préférentiellement comprise entre 60% et 70%.Advantageously the weight of the nitrate of hydroxylammonium represents at least 50% of the total weight of the composition, the content of the latter in hydroxylammonium nitrate preferably being between 60% and 70%.
Un des avantages de la présente invention réside dans le fait qu'aux teneurs indiquées les mélanges eau/nitrate d'hydroxylammonium demeurent liquides du moment que la température de ces derniers ne descend pas en dessous de zéro degrés Celsius.One of the advantages of the present invention resides in the fact that at the indicated contents the mixtures water / hydroxylammonium nitrate remain liquid from the as long as the temperature does not drop below zero degrees Celsius.
Selon une première variante préférée, les compositions selon l'invention contiennent également des oxydants secondaires qui sont avantageusement choisis dans le groupe constitué par le nitrate d'ammonium, l'hexogène (RDX) et l'octogène (HMX). Ces oxydants secondaires permettent d'augmenter le nombre de molécules gazeuses produites par la combustion d'un volume donné de composition sans que la température des gaz de combustion n'augmente trop grâce à l'eau contenue dans la composition.According to a first preferred variant, the compositions according to the invention also contain secondary oxidants which are advantageously chosen in the group consisting of ammonium nitrate, hexogen (RDX) and octogen (HMX). These oxidants allow to increase the number of gaseous molecules produced by the combustion of a given volume of composition without the temperature of combustion gas does not increase too much thanks to the water contained in the composition.
Selon une seconde variante préférée, lorsque les compositions sont destinées à constituer des chargements pyrotechniques pour des générateurs de gaz devant gonfler des coussins de protection pour les occupants d'un véhicule automobile, on évitera l'emploi du nitrate d'ammonium ou en tout cas on limitera la teneur pondérale de la composition en nitrate d'ammonium à quelques pourcents. According to a second preferred variant, when the compositions are intended to constitute loads pyrotechnics for gas generators in front inflate protective cushions for occupants of a motor vehicle, avoid the use of nitrate ammonium or in any case limit the content by weight of the ammonium nitrate composition to a few percent.
Pour cette application les compositions contiendront le plus souvent des additifs stabilisants qui seront choisis parmi la bipyridine, l'hydrogénophosphate d'ammonium et l'acétate d'ammonium. La teneur pondérale de ces stabilisants dans la composition sera voisine de 2%. La bipyridine et l'hydrogénophosphate d'ammonium sont des stabilisants préférés.For this application the compositions will most often contain stabilizing additives who will be chosen from bipyridine, ammonium hydrogen phosphate and ammonium acetate. The weight content of these stabilizers in the composition will be close to 2%. Bipyridine and ammonium hydrogen phosphate are stabilizers preferred.
Avantageusement encore, pour les applications destinées à la sécurité automobile, les compositions contiendront des additifs épaississants qui seront choisis dans le groupe constitué par les isocyanates hydrodiluables, les résines mélamine-formol et le borax qui est un tétraborate de sodium de formule : Na2B4O7,10H2O.Advantageously also, for applications intended for automotive safety, the compositions will contain thickening additives which will be chosen from the group consisting of water-soluble isocyanates, melamine-formaldehyde resins and borax which is a sodium tetraborate of formula: Na 2 B 4 O 7 , 10H 2 O.
L'invention concerne également un procédé de
fabrication en continu de chargements pyrotechniques
solides à structure amorphe dont la composition
correspond aux compositions décrites ci-dessus et qui
est caractérisé en ce que :
Avantageusement l'appareil de malaxage et
d'extrusion est une extrudeuse bi-vis.
Selon une réalisation préférée du procédé selon
l'invention le liant à effet gélifiant est de l'alcool
polyvinylique et l'extrudeuse bi-vis est chauffée à une
température comprise entre 50°C et 60°C, la température
à l'intérieur de l'étuve étant voisine de 80°C. De
manière particulièrement préférée tous les consitutants
autres que le liant et qui sont solubles dans l'eau
seront mélangés à la phase liquide contenant l'eau et le
nitrate d'hydroxylammonium avant introduction de cette
dernière dans l'extrudeuse bi-vis.Advantageously, the kneading and extrusion apparatus is a twin-screw extruder.
According to a preferred embodiment of the process according to the invention, the binder with gelling effect is polyvinyl alcohol and the twin-screw extruder is heated to a temperature between 50 ° C. and 60 ° C., the temperature inside the oven being close to 80 ° C. In a particularly preferred manner all the constituents other than the binder and which are soluble in water will be mixed with the liquid phase containing the water and the hydroxylammonium nitrate before introduction of the latter into the twin-screw extruder.
Les chargements pyrotechniques ainsi obtenus peuvent notamment être utilisés soit dans les extincteurs pyrotechniques pour constituer la source de gaz moteur dans ces extincteurs, soit dans les générateurs pyrotechniques de gaz destinés à gonfler des coussins de protection pour les occupants d'un véhicule automobile.The pyrotechnic charges thus obtained can in particular be used either in pyrotechnic extinguishers to constitute the source of engine gas in these fire extinguishers, either in pyrotechnic gas generators intended to inflate protective cushions for vehicle occupants automobile.
on donne ci-après une description détaillée d'une réalisation préférée de l'invention en se référant à la figure 1 qui représente le schéma d'une installation de fabrication en continu de chargements selon l'invention.a detailed description is given below preferred embodiment of the invention with reference to the Figure 1 which represents the diagram of an installation of continuous manufacturing of loads according to the invention.
L'installation représentée à la figure 1 comprend
fondamentalement une boudineuse bi-vis 1 prolongée par
une tête d'extrusion 2, une bande transporteuse 3
passant à l'intérieur d'une étuve 4 et un système de
découpe 5. Au début de l'extrudeuse sont prévus deux
dispositifs d'alimentation.
Le premier dispositif consiste en un tuyau 6 relié
par l'intermédiaire d'un robinet 7 à un bac 8 muni d'un
agitateur 9. The installation shown in FIG. 1 basically comprises a twin-screw extruder 1 extended by an extrusion head 2, a
The first device consists of a pipe 6 connected via a
En aval dans le sens de fonctionnement de la
boudineuse 1 se trouve un second dispositif
d'alimentation constitué par une trémie 10 et un tapis
transporteur 11.Downstream in the operating direction of the
extruder 1 is a second device
feed consisting of a
Le bac 8 contient un mélange liquide A constitué par de l'eau, du nitrate d'hydroxylammonium et, le cas échéant, les constituants autres que le liant et solubles dans l'eau comme le nitrate d'ammonium. Les constituants réactifs vis-à-vis de l'eau ne sont pas incorporés à cette phase liquide aqueuse.The tank 8 contains a liquid mixture A consisting with water, hydroxylammonium nitrate and, if applicable constituents other than the binder and soluble in water such as ammonium nitrate. The reactive constituents with respect to water are not incorporated into this aqueous liquid phase.
Le tapis transporteur 11 alimente la trémie 10 avec
un mélange de granulés B comprenant des granulés de
liant et, le cas échéant, des granulés d'additifs non
solubles dans l'eau et notamment des granulés d'oxydants
non solubles dans l'eau comme l'hexogène ou l'octogène.The
L'extrudeuse 1 est régulée en température pour présenter une température interne comprise entre 50°C et 60°C lorsque le liant est de l'alcool polyvinylique.Extruder 1 is temperature controlled to have an internal temperature between 50 ° C and 60 ° C when the binder is polyvinyl alcohol.
La phase liquide A et les granulés B sont mélangés
dans l'extrudeuse 1 pour former, par gélification du
liant, une pâte composite à structure amorphe qui est
extrudée au travers de la tête d'extrusion 2 sous forme
d'un jonc profilé 12. Ce jonc peut-être un simple brin
cylindrique, éventuellement pourvu de canaux internes,
pour donner, après découpage, des grains en vrac ou être
un jonc de dimensions plus importantes, avec, le cas
échéant, un profil extérieur travaillé, pour donner
après découpage des blocs pleins ou annulaires.
Ce jonc 12 est conduit par l'intermédiaire de la
bande transporteuse 3 au travers d'une étuve chauffée
pour provoquer le durcissement du liant gélifié. Lorsque
le liant est l'alcool polyvinylique la température de
l'étuve sera voisine de 80°C et le temps de séjour du
jonc dans l'étuve sera de quelques minutes.The liquid phase A and the granules B are mixed in the extruder 1 to form, by gelation of the binder, a composite paste with an amorphous structure which is extruded through the extrusion head 2 in the form of a profiled
This
En sortie d'étuve le jonc 12 est découpé grâce au
système de découpe 5 en chargements élémentaires 13 qui
sont stockés dans un container 14.On leaving the oven the
On a ainsi fabriqué des chargements en forme de
couronnes cylindriques. Ces chargements avaient les
compositions suivantes :
Claims (14)
- Solid pyrotechnic composition producing by combustion gases free from solid residues and consisting of at least one organic binder having a gelling effect and by at least one main oxidizing system in the liquid phase absorbed by the said binder, characterized in that :i) the said organic binder having a gelling effect is chosen from the group consisting of polyvinyl alcohol, hydroxyethyl cellulose and xanthan gum,ii) the said main oxidizing system in the liquid phase consists of a mixture of water and hydroxylammonium nitrate, the water content by weight in the said composition being between 5 and 20 %.
- Composition according to claim 1, characterized in that the weight of the said hydroxylammonium nitrate represents at least 50 % of the total weight of the composition.
- Composition according to claim 2, characterized in that the content by weight of hydroxylammonium nitrate in the said composition is between 60 % and 70 %.
- Composition according to claim 1, characterized in that it contains secondary oxidants.
- Composition according to claim 4, characterized in that the said secondary oxidants are chosen from the group consisting of ammonium nitrate, hexogen and octogen.
- Composition according to claim 1, characterized in that it contains stabilizing additives.
- Composition according to claim 6, characterized in that the said stabilizing additives are chosen from the group consisting of bipyridine, ammonium hydrogenophosphate and ammonium acetate.
- Composition according to claim 7, characterized in that the stabilizing additive is chosen from the group consisting of bipyridine and ammonium hydrogenophosphate.
- Composition according to claim 1, characterized in that it contains thickening additives.
- Composition according to claim 9, characterized in that the said thickening additives are chosen from the group consisting of isocyanates, melamine-formaldehyde resins and borax.
- Method for manufacturing solid pyrotechnic charges with an amorphous structure of which the composition corresponds to any one of claims 1 to 10, characterized in that :i) a blending and extruding apparatus (1) is fed continuously on the one hand with a liquid phase (A) containing at least water and hydroxylammonium nitrate and on the other hand with solid granules (B) containing at least one binder having a gelling effect,ii) after blending, a profiled bead (12) is extruded which is hardened in an oven (4) and cut to the desired length.
- Method according to claim 11, characterized in that the blending and extruding apparatus is a twin-screw extruder.
- Method according to claim 12, characterized in that the binder having a gelling effect is polyvinyl alcohol and in that the twin-screw extruder is heated to a temperature of between 50°C and 60°C, the temperature inside the oven being close to 80°C.
- Method according to claim 13, characterized in that all the constituents other than the binder and those soluble in water are mixed with the liquid phase containing water and hydroxylammonium nitrate before the latter is introduced into the twin-screw extruder.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9807090A FR2779426B1 (en) | 1998-06-05 | 1998-06-05 | SOLID PYROTECHNICAL CHARGES GAS GENERATORS BASED ON COMPOSITIONS CONTAINING WATER |
FR9807090 | 1998-06-05 | ||
PCT/FR1999/001206 WO1999064375A1 (en) | 1998-06-05 | 1999-05-21 | Gas-generating solid pyrotechnic loads based on compositions containing water |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1087919A1 EP1087919A1 (en) | 2001-04-04 |
EP1087919B1 true EP1087919B1 (en) | 2002-12-04 |
Family
ID=9527056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99920902A Expired - Lifetime EP1087919B1 (en) | 1998-06-05 | 1999-05-21 | Gas-generating solid pyrotechnic loads based on compositions containing water |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1087919B1 (en) |
JP (1) | JP2002517376A (en) |
AT (1) | ATE228984T1 (en) |
DE (1) | DE69904326T2 (en) |
FR (1) | FR2779426B1 (en) |
WO (1) | WO1999064375A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100357235C (en) * | 2006-04-14 | 2007-12-26 | 安徽盾安化工集团有限公司 | TNT-free powdered modified ammonium nitrate-fuel oil explosive and preparation process thereof |
CN100357234C (en) * | 2006-04-14 | 2007-12-26 | 安徽盾安化工集团有限公司 | Powdered ammonium nitrate-fuel oil explosive and production process thereof |
JP5110256B2 (en) * | 2006-12-12 | 2012-12-26 | 独立行政法人 宇宙航空研究開発機構 | Gas generant composition |
JP2009190911A (en) * | 2008-02-13 | 2009-08-27 | Daicel Chem Ind Ltd | Gas generator composition |
DE102012104087A1 (en) * | 2012-05-09 | 2013-11-14 | Bayern-Chemie Gesellschaft Für Flugchemische Antriebe Mbh | Gas generator fuel |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA835342B (en) * | 1982-08-02 | 1985-01-30 | Jet Research Center | A stable single phase liquid explosive |
GB2293820B (en) * | 1988-12-20 | 1996-07-03 | Aerojet General Co | Liquid oxidizer compositions and their use in energetic formulations |
US5060973A (en) * | 1990-07-23 | 1991-10-29 | General Electric Company | Liquid propellant inflator for vehicle occupant restraint apparatus |
US5386777A (en) * | 1992-02-10 | 1995-02-07 | Aero-Jet General Corporation | Rocket motor construction from porous binder core |
US5684269A (en) * | 1996-03-15 | 1997-11-04 | Morton International, Inc. | Hydroxylammonium nitrate/water/self-deflagrating fuels as gas generating pyrotechnics for use in automotive passive restraint systems |
US5703323A (en) * | 1996-09-17 | 1997-12-30 | Olin Corporation | Pyridine and pyridone stabilizers for hydroxylammonium nitrate and hydroxylamine-containing compositions |
-
1998
- 1998-06-05 FR FR9807090A patent/FR2779426B1/en not_active Expired - Fee Related
-
1999
- 1999-05-21 EP EP99920902A patent/EP1087919B1/en not_active Expired - Lifetime
- 1999-05-21 JP JP2000553386A patent/JP2002517376A/en active Pending
- 1999-05-21 DE DE69904326T patent/DE69904326T2/en not_active Expired - Lifetime
- 1999-05-21 AT AT99920902T patent/ATE228984T1/en not_active IP Right Cessation
- 1999-05-21 WO PCT/FR1999/001206 patent/WO1999064375A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
DE69904326T2 (en) | 2003-08-28 |
FR2779426B1 (en) | 2000-07-13 |
FR2779426A1 (en) | 1999-12-10 |
WO1999064375A1 (en) | 1999-12-16 |
ATE228984T1 (en) | 2002-12-15 |
JP2002517376A (en) | 2002-06-18 |
DE69904326D1 (en) | 2003-01-16 |
EP1087919A1 (en) | 2001-04-04 |
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