Composition for gas generating

• US 5,074,940 A
• Filed: 06/18/1991
• Issued: 12/24/1991
• Est. Priority Date: 06/19/1990
• Status: Expired due to Fees

• Current Assignee: Nippon Oil and Fats Co., Ltd. (NOF Corporation)
• Original Assignee: Nippon Oil and Fats Co., Ltd. (NOF Corporation)
• Inventors: Ochi, Kouji, Matsuda, Kazunori, Narita, Kazuyuki
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Application Number:
  US07/716,898
• Time in Patent Office: 189 Days
• Field of Search: 149/21, 149/35, 149/110, 149/114
• US Class Current: 149/35
• CPC Class Codes: C06B 35/00 Compositions containing a metal azide
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: Y10S 149/11 Particle size of a component
• CPC Class Codes: Y10S 149/114 Inorganic fuel

Abstract

A gas generating composition comprises an azide of an alkali metal or an alkaline earth metal, and manganese dioxide for oxidizing the azide. The composition further includes a clay material containing at least 37% by weight of silicon dioxide and having a mixing ratio of at least 5.5% by weight. This composition can allow burning to be conducted at low temperature to ensure the generation of the desired gas. The strength of a pellet of the composition can be improved without generating a toxic gas or reducing the burning rate or reducing the working efficiency in producing the pellet.

Claims

1. A gas generating composition comprising:

an azide of an alkaline metal or an alkaline earth metal;

manganese dioxide for oxidizing the azide; and

a clay material containing not less than 37% by weight of silicon dioxide and having a mixing ratio of not less than 5.5% by weight.

2. A gas generating composition according to claim 1, wherein the azide has a particle size of 20 μ

m or smaller.

3. A gas generating composition according to claim 1, wherein the manganese dioxide has a particle size of 10 μ

m or smaller.

4. A gas generating composition according to claim 1, wherein the clay material has an average particle size of 4 μ

m.

5. A gas generating composition according to claim 1, wherein the azide is an azide of an alkali metal.

6. A gas generating composition according to claim 5, wherein the alkali metal is sodium.

7. A gas generating composition according to claim 1, wherein the azide is an azide of an alkaline earth metal.

8. A gas generating composition according to claim 1, wherein the manganese dioxide has been burnt at a temperature in the range of 250°

to 500°

C.

9. A gas generating composition according to claim 8, wherein the manganese dioxide has been burnt at a temperature in the range of 300°

to 400°

C.

10. A gas generating composition according to claim 1, wherein the clay material is bentonite containing at least 60% by weight of silicon dioxide.

11. A gas generating composition according to claim 1, wherein the clay material is montmorillonite containing at least 50% by weight of silicon dioxide.

12. A gas generating composition according to claim 1, wherein the gas generating composition has a strength to endure a drop test by which a 16.7-g steel ball is dropped from a height of less than 9 cm toward a disk-shaped sample prepared from the composition.

13. A gas generating composition according to claim 1, wherein the gas generating composition is burnt at a rate of 21 mm/sec or faster in a case where a strand burning rate of a rod sample prepared from the composition is measured.

14. A gas generating composition comprising:

an azide mixed at a ratio of 52 to 72% by weight;

manganese dioxide mixed at a ratio of 22 to 42% by weight; and

a clay material mixed at a ratio of 6 to 20% by weight.

15. A gas generating composition according to claim 14, wherein the gas generating composition comprises:

sodium azide mixed at a ratio of 55 to 65% by weight;

a burnt manganese dioxide mixed at a ratio of 30 to 38% by weight; and

bentonite mixed at a ratio of 6 to 10% by weight.

16. A gas generating composition comprising:

sodium azide having a particle size of 20 μ

m or smaller and a mixing ratio of 55 to 65% by weight;

a burnt manganese dioxide burnt at a temperature in the range of 300°

to 400°

C. and having a particle size of 10 μ

m or smaller and a mixing ratio of 30 to 38% by weight; and

bentonite having an average particle size of 4 μ

m or smaller and a mixing ratio of 6 to 10% by weight.