Extrudable gas generating propellants, method and apparatus

• US 5,125,684 A
• Filed: 10/15/1991
• Issued: 06/30/1992
• Est. Priority Date: 10/15/1991
• Status: Expired due to Term

• Current Assignee: Alliant Techsystems Incorporated (Northrop Grumman Corporation)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Cartwright, Richard V.
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Application Number:
  US07/776,943
• Time in Patent Office: 259 Days
• Field of Search: 149/19.7, 149/19.8, 149/64, 149/88, 149/92, 149/93, 149/80, 149/69, 149/79, 264/3.3, 264/3.4, 280/736, 280/741
• US Class Current: 280/736
• CPC Class Codes: C06B 29/16 with a nitrated organic compound
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

A stable extrudable non-azide crash bag propellant composition for generating high quality nitrogen gas and a low temperature process for producing the same from an extrudable mass containing an effective amount of a cellulose-based binder.

Claims

1. A crash bag propellant comprising, in combination,

(a) about 45-80 wt % oxidizer salt;

(b) an effective amount of a cellulose-based binder;

(c) about 10-35 wt % of energetic component selected from the group consisting of nitroguanidine, triaminoguanidine nitrate, ethylene dinitramine, cyclotrimethylenetetranitramine, cyclotetramethylenetetranitramine, trinitrotoluene and pentaerythritoltetranitrate; and

(d) up to about 5 wt % additive(s).

2. The crash bag propellant of claim 1 wherein the oxidizer salt is at least one member selected from the group consisting of sodium nitrate, potassium nitrate, sodium perchlorate, and potassium perchlorate.

3. The crash bag propellant of claim 2 comprising:

(a) about 52-64 wt % of KNO₃ ;

(b) about 15-25 wt % nitrocellulose binder;

(c) about 15-25 wt % nitroguanidine; and

(d) up to about 2.0 wt % additives.

4. The crash bag propellant of claim 2 comprising:

(a) about 47-68 wt % KClO₄ ;

(b) about 15-25 wt % nitrocellulose binder;

(c) about 11-31 wt % nitroguanidine; and

(d) up to about 2.0 wt % additives.

5. The crash bag propellant of claim 2 comprising about 10-31 wt % cyclotrimethylenetetranitramine as an energetic component.

6. The crash bag propellant of claim 2 comprising about 10-31 wt % trinitrotoluene as an energetic component.

7. The crash bag propellant of claim 2 comprising about 10-31 wt % pentaerythritoltetranitrate as an energetic component.

8. The crash bag propellent of claim 2 comprising about 10-31 wt % triaminoguanidine nitrate as an energetic component.

17. A safety crash bag device comprising, in combination, an inflatable bag of desired shape receivably connected by gas conducting means to gas generating means charged with an active amount of gas-generating propellant as defined in claim 1, said gas generating means being in functional proximity to ignition means for effecting ignition of said propellant;

and impact detecting means of predetermined sensitivity functionally connected to said ignition means, wherein an impacting force on said impact detecting means effects a firing sequence through said ignition means for ignition of said propellant, generating gas in said gas generating means, and passing said gas to said inflatable bag through said gas conducting means to create a shock-absorbing barrier.

18. The device of claim 17 having a venturi tube in air or oxygen-feedable relation to said gas conducting means to dilute or modify propellant generated gas.

19. The device of claim 17 having a pressure wave sensitive valving means for releasing compressed air or oxygen into the gas generating means or gas-conducting means to dilute or modify propellant-generated gas.

20. The device of claim 17 utilizing, as propellant component, the gas generating propellant defined in claim 2.

21. The device of claim 17 utilizing, as propellant component, the gas generating propellant defined in claim 3.

22. The device of claim 17 utilizing, as propellant component, the gas-generating propellant defined in claim 4.

9. A process for preparing extruded smokeless-type crash bag propellant comprising

A. forming an extrudible mass comprising

(a) 45-80 wt. % oxidizer salt;

(b) an effective amount of a cellulose based binder;

(c) about 10-35 wt. % of at least one energetic component selected from the group consisting of nitroguanidine, triaminoguanidine nitrate, ethylene dinitramine, cyclotrimethylenetetranitroamine, trinitrotoluene and pentaerythritoltetranitrate;

(d) up to about 5% additive(s); and

(e) up to about 25 wt. % removable solvent;

B. blocking the extrudible mass, as desired;

C. extruding the blocked extrudible mass through a die;

D. cutting the extrudate and drying the cut particles; and

E. applying an antistatic agent onto the particulate product, as desired, to obtain the desired propellant.

10. The process of claim 9 wherein the oxidizer salt is at least one compound of the formula

11. The process of claim 9 wherein the oxidizer salt is at least one member selected from the group consisting of sodium nitrate, potassium nitrate, sodium perchlorate, and potassium perchlorate, and the cellulose-based binder is a member selected from the group consisting of nitrocellulose, cellulose acetate, and cellulose acetate butyrate.

12. The process of claim 11 comprising utilizing about 52-64 wt % KNO₃ as oxidizer salt;

about 15-25 wt. % nitrocellulose binder; and

about 15-25 wt % nitroguanidine as an energetic component.

13. The process of claim 11 comprising utilizing about 47-68 wt % KClO₄ as oxidizer salt, about 15-25 wt % nitrocellulose binder;

and about 11 31 wt. % nitroguanidine as an energetic component.

14. The process of claim 10 comprising utilizing 10-31 wt. % cyclotrimethylenetrinitramine as an energetic component.

15. The process of claim 10 comprising utilizing 10-31 wt. % cyclotetramethylenetetranitramine as an energetic component.

16. The process of claim 10 comprising utilizing 10-31 wt. % pentaerythritoltetranitrate as an energetic component.