COMPOSITION FOR GENERATING NITROGENOUS GAS AND INCLUDING AZODICARBONAMIDE, AND METHOD FOR GENERATING NITROGEN GAS BY DECOMPOSITION OF SAID COMPOSITION

• US 20100329960A1
• Filed: 01/20/2009
• Published: 12/30/2010
• Est. Priority Date: 01/21/2008
• Status: Active Grant

• Current Assignee: ArianeGroup SAS
• Original Assignee: Snpe Materiaux Energetiques (Government of France)
• Inventors: Blanchard, Helene, Rocton, Hugues
• Granted Patent: US 8,287,834 B2
• Time in Patent Office: Days
• US Class Current: 423/351
• CPC Class Codes: C06B 43/00 Compositions characterised by explosive or thermic constituents not provided for in groups C06B25/00 - C06B41/00
• CPC Class Codes: C06D 5/00 Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets explosive compositions containing an oxidizer, fuels for rocket engines intended for reaction with an oxidant other than air C06B
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: C08J 9/103 Azodicarbonamide

Abstract

A subject matter of the present invention is compositions which generate nitrogenous gas, with a low decomposition temperature, and processes for the generation of nitrogenous gas comprising the decomposition of such compositions. Said compositions comprise:

• • from 20 to 80% by weight of azodicarbonamide,
  • from 20 to 80% by weight of a nitrogenous reducing charge,
  • from 0 to less than 10% by weight of at least one additive;
    said azodicarbonamide and said nitrogenous reducing charge representing at least 90% of their weight and said nitrogenous reducing charge comprising:
  • at least one compound from a first family of reducing components chosen from tetrazole, tetrazole derivatives and their salts, salts of bitetrazole and of its derivatives, 5,5′-azobitetrazole salts, polyvinyltetrazoles and their mixtures;
    and/or
  • at least one compound from a second family of reducing components chosen from dicyandiamide, 1-hydrobenzotriazole, silicon nitride, nitroguanidine, guanidine nitrate and their mixtures.
    a nitrogenous reducing charge and azodicarbonamide.

Claims

1. A composition which is capable of generating nitrogenous gas by decomposition and which is devoid of oxidizing charge, comprising:

from 20 to 80% by weight of azodicarbonamide,

from 20 to 80% by weight of a nitrogenous reducing charge,

from 0 to less than 10% by weight of at least one additive;

said azodicarbonamide and said nitrogenous reducing charge representing at least 90% of its weight and said nitrogenous reducing charge comprising at least one selected from the group consisting of;

at least one compound from a first family of reducing components chosen from tetrazole, tetrazole derivatives and their salts, salts of bitetrazole and of its derivatives, 5,5′

-azobitetrazole salts, polyvinyltetrazoles and their mixtures;

and

at least one compound from a second family of reducing components chosen from dicyandiamide, 1-hydrobenzotriazole, silicon nitride, nitroguanidine, guanidine nitrate and their mixtures.

2. The composition as claimed in claim 1, comprising:

from 25 to 55% by weight of azodicarbonamide,

from 45 to 75% by weight of a nitrogenous reducing charge,

from 0 to less than 7% by weight of at least one additive.

3. The composition as claimed in claim 1, wherein said azodicarbonamide and said nitrogenous reducing charge represent at least 93% by weight of said composition.

4. The composition as claimed in claim 1, wherein said nitrogenous reducing charge is composed of at least 90% by weight of at least one compound from said first family.

5. The composition as claimed in claim 4, wherein the remainder of the nitrogenous reducing charge is at least partially made up of at least one compound from said second family.

6. The composition as claimed in claim 1, wherein said at least one additive is at least one chosen from zinc derivatives and urea.

7. The composition as claimed in claim 1, wherein the nitrogenous reducing charge comprises diammonium bitetrazole.

8. The composition as claimed in claim 1, provided in a pulverulent form or in a form of solid compounds of grain, pellet or block type.

9. The composition as claimed in claim 1, provided in a form of mono- or multiperforated monolithic blocks.

10. A process for the generation of nitrogenous gas by decomposition of at least one composition, wherein said at least one composition is a composition as claimed in claim 1.

11. The process as claimed in claim 10, wherein the energy necessary for the initiation of said decomposition of said at least one composition is contributed by the combustion of a pyrotechnic charge.

12. The process as claimed in claim 11, wherein said pyrotechnic charge is based on a mixture of guanidine nitrate and basic copper nitrate.

13. The process as claimed in claim 10, which is carried out for the blowing of structures, the pressurization of chambers, the extinguishing of fires or inerting.

14. The composition as claimed in claim 6, wherein the additive comprises of at least one of zinc sterate and zinc oxide.

15. The composition as claimed in claim 7, wherein the nitrogenous reducing charge consists of diammonium bitetrazole.