WO2007012348A1 - Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules - Google Patents

Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules Download PDF

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Publication number
WO2007012348A1
WO2007012348A1 PCT/EP2005/053637 EP2005053637W WO2007012348A1 WO 2007012348 A1 WO2007012348 A1 WO 2007012348A1 EP 2005053637 W EP2005053637 W EP 2005053637W WO 2007012348 A1 WO2007012348 A1 WO 2007012348A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas generating
generating composition
composition according
composition
previous
Prior art date
Application number
PCT/EP2005/053637
Other languages
English (en)
Inventor
José Damián MARTÍNEZ HUERTAS
Fabrice Sayous
Marcel Pascal Lengrand
Original Assignee
Dalphi Metal España, S.A.
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 Dalphi Metal España, S.A. filed Critical Dalphi Metal España, S.A.
Priority to PCT/EP2005/053637 priority Critical patent/WO2007012348A1/fr
Publication of WO2007012348A1 publication Critical patent/WO2007012348A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0041—Shaping the mixture by compression
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/0066—Shaping the mixture by granulation, e.g. flaking
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
    • C06B23/007—Ballistic modifiers, burning rate catalysts, burning rate depressing agents, e.g. for gas generating
    • 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
    • C06D5/06—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by reaction of two or more solids

Definitions

  • the present invention refers to gas generating compositions for filling a vehicle occupant protection device, such as an airbag.
  • the compositions of the invention have a reduced pressure exponent, high clean gas generation performance and can be easily processed by means of pellet formation without requiring binders.
  • a vehicle occupant protection device such as an airbag, generally comprises a housing, a gas generating material inside said housing, a starter so that the gas generating material can combust, and means for leading the gas to the airbag.
  • the starter makes the gas generating composition combust, producing an inflated gas volume. This gas is led to the airbag which expands, protecting the vehicle occupant.
  • Pellet formation of the gas generating material in automatic mechanical presses is the most cost-effective industrial manufacturing process due to the rates of output obtained and the easy process control. However the process has the drawback of showing difficulties when components with certain particle sizes are used.
  • a solution to this problem is the use of binders. However, their use reduces the rate of output and frequently forces working with mixtures under heat.
  • compositions containing azides, composite propellants or nitramide propellants have been used, among other components, in gas generating compositions used up until now. These compounds have drawbacks in terms of toxicity of the generated gases, long-term stability or low burning rates.
  • Dinitramide-based propellants have been developed to solve these problems .
  • Dinitramides have the general formula X + [N (NO 2 ) 2 ] ' , where X+ is the cationic counterion. These compounds have high burning rates and do not produce reaction products that can be toxic. In this sense, dinitramides have been used as propellants, for example in US patents 5,498,303 and 5,324,075.
  • a dinitramide has particularly been disclosed that produces an especially satisfactory result. It is guanylurea dinitramide (C 2 N 7 H 7 O 5 , hereinafter GUDN) .
  • This compound has the following advantages:
  • the problem to be resolved by the present invention is to provide gas generating compositions having reduced pressure exponents while at the same time maintaining processing features allowing them to be processed by pellet formation without requiring binders .
  • compositions of the invention show an improved performance against aging when their humidity content is less than 0.2%.
  • the invention is aimed at an improved gas generating composition
  • GUDN a mixture of potassium nitrate (NO 3 K) and basic copper nitrate
  • a gas generating composition is thus obtained which has the previously mentioned advantages derived from the presence of GUDN, especially a burning rate substantially independent of the particle size, but in which the combustion temperature and dependence of the burning rate on pressure have been substantially reduced as a result of the incorporation of an effective amount of at least one pressure exponent reducing additive (not a binder) .
  • the invention is aimed at a process for producing said gas generating compositions, comprising the step of drying the composition until having a humidity content of less than 0.2%. This process facilitates the production of gas generating compositions having a smaller pressure exponent.
  • the invention refers to the use of said composition in vehicle occupant protection devices such as airbags .
  • Figure 1 shows the dependence of the burning rate on pressure for compositions with different GUDN particle sizes.
  • Figure 2 shows the dependence of the burning rate on pressure for compositions with different MgO contents.
  • Figure 3 shows the dependence of the burning rate on the % of MgO added to the composition at a given pressure (22 MPa) .
  • Figures 4a and 4b show the dependence of the burning rate on pressure for different compositions which have been subjected to aging tests under different relative humidity conditions.
  • the composition comprises as a fuel component the guanylurea dinitramide (GUDN) .
  • the percentage of GUDN used in the preferred embodiment is about 50-70% by weight of the total composition or less.
  • a mixture of potassium nitrate (NO 3 K) and basic copper nitrate (NO S ) 2 CU-SCU(OH) 2 is used as an oxidizer.
  • the latter has the property of reducing the combustion temperature and reducing the pressure exponent.
  • the sum of these two oxidizers is about 25-35% of the mixture or less.
  • MgO is added in the preferred embodiment to reduce the dependence of the burning rate on pressure. All the indicated percentages are by weight unless otherwise specified.
  • potassium perchlorate is added in the preferred embodiment to favor CO 2 production, reducing CO production.
  • between 0%-l% of zinc or magnesium stearate is added to reduce the humidity absorption capacity of the composition.
  • the first of the two is preferably added since its melting point is 130 0 C compared to 87 0 C for magnesium stearate.
  • the humidity content of the composition is less than 0.2% in order to improve its performance against aging.
  • the addition of zinc stearate reduces the humidity absorption capacity such that in order to have good aging results, the H2O content of the pellets must be less than 0.2%, which corresponds to pellet aging at a relative humidity of 0% (dryness) .
  • compositions of the invention have a burning rate of about 20 mm/s at 22 MPa and pressure exponents
  • the manufacturing process corresponds to the general scheme:
  • the press used is preferably a double-acting automatic feed rotary press, the entire process being carried out under controlled environmental conditions.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne une composition génératrice de gaz destinée à un dispositif de protection des occupants d'un véhicule gonflable sous forme de granules contenant un composant combustible à savoir du dinitramide de guanylurée, un oxydant qui consiste en un mélange de nitrate de potassium (NO3K) et un nitrate basique de cuivre (NO3)2Cu 3Cu(OH)2 et une quantité efficace d'au moins un composé modifiant l'exposant de pression de la composition telle que du MgO dans une concentration comprise entre 2 et 6 %. L'invention concerne également un procédé destiné à obtenir cette composition.
PCT/EP2005/053637 2005-07-26 2005-07-26 Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules WO2007012348A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/053637 WO2007012348A1 (fr) 2005-07-26 2005-07-26 Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/053637 WO2007012348A1 (fr) 2005-07-26 2005-07-26 Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules

Publications (1)

Publication Number Publication Date
WO2007012348A1 true WO2007012348A1 (fr) 2007-02-01

Family

ID=36582019

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053637 WO2007012348A1 (fr) 2005-07-26 2005-07-26 Composition generatrice de gaz destinee a une utilisation automobile fabriquee par formation de granules

Country Status (1)

Country Link
WO (1) WO2007012348A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2346797A1 (fr) * 2008-11-12 2011-07-27 Autoliv ASP, INC. Compositions de génération de gaz comportant des fibres de verre

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659711A2 (fr) * 1993-12-10 1995-06-28 Morton International, Inc. Auxiliaires de traitement pour compositions génératrices de gaz
US5500059A (en) * 1993-08-02 1996-03-19 Thiokol Corporation Anhydrous 5-aminotetrazole gas generant compositions and methods of preparation
WO1998055428A1 (fr) * 1997-05-21 1998-12-10 Försvarets Forskningsanstalt Nouveau compose chimique, explosif contenant ce compose et utilisation de ce compose dans des generateurs de gaz
EP1006096A1 (fr) * 1998-12-02 2000-06-07 TRW Airbag Systems GmbH & Co. KG Composition génératrice de gaz exempt d'azoture
US6117255A (en) * 1998-07-28 2000-09-12 Trw Inc. Gas generating composition comprising guanylurea dinitramide
US6132537A (en) * 1998-04-08 2000-10-17 Trw Airbag Systems Gmbh & Co. Kg Azide-free gas-producing composition
US6143102A (en) * 1999-05-06 2000-11-07 Autoliv Asp, Inc. Burn rate-enhanced basic copper nitrate-containing gas generant compositions and methods
US6176950B1 (en) * 1999-05-17 2001-01-23 James C. Wood Ammonium nitrate and paraffinic material based gas generating propellants
US20020079031A1 (en) * 2000-12-22 2002-06-27 Snpe Gas-generating pyrotechnic compositions with a hydrocarbonaceous binder and continuous manufacturing process
EP1342705A1 (fr) * 2000-10-10 2003-09-10 Nippon Kayaku Kabushiki Kaisha Composition d'agent de generation de gaz, et generateur de gaz fonctionnant avec cette composition

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5500059A (en) * 1993-08-02 1996-03-19 Thiokol Corporation Anhydrous 5-aminotetrazole gas generant compositions and methods of preparation
EP0659711A2 (fr) * 1993-12-10 1995-06-28 Morton International, Inc. Auxiliaires de traitement pour compositions génératrices de gaz
WO1998055428A1 (fr) * 1997-05-21 1998-12-10 Försvarets Forskningsanstalt Nouveau compose chimique, explosif contenant ce compose et utilisation de ce compose dans des generateurs de gaz
US6132537A (en) * 1998-04-08 2000-10-17 Trw Airbag Systems Gmbh & Co. Kg Azide-free gas-producing composition
US6117255A (en) * 1998-07-28 2000-09-12 Trw Inc. Gas generating composition comprising guanylurea dinitramide
EP1006096A1 (fr) * 1998-12-02 2000-06-07 TRW Airbag Systems GmbH & Co. KG Composition génératrice de gaz exempt d'azoture
US6143102A (en) * 1999-05-06 2000-11-07 Autoliv Asp, Inc. Burn rate-enhanced basic copper nitrate-containing gas generant compositions and methods
US6176950B1 (en) * 1999-05-17 2001-01-23 James C. Wood Ammonium nitrate and paraffinic material based gas generating propellants
EP1342705A1 (fr) * 2000-10-10 2003-09-10 Nippon Kayaku Kabushiki Kaisha Composition d'agent de generation de gaz, et generateur de gaz fonctionnant avec cette composition
US20020079031A1 (en) * 2000-12-22 2002-06-27 Snpe Gas-generating pyrotechnic compositions with a hydrocarbonaceous binder and continuous manufacturing process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2346797A1 (fr) * 2008-11-12 2011-07-27 Autoliv ASP, INC. Compositions de génération de gaz comportant des fibres de verre
EP2346797A4 (fr) * 2008-11-12 2013-12-18 Autoliv Asp Inc Compositions de génération de gaz comportant des fibres de verre

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