Method for preparing pyrotechnics oxidized by basic metal nitrate

• US 20040173922A1
• Filed: 03/04/2003
• Published: 09/09/2004
• Est. Priority Date: 03/04/2003
• Status: Abandoned Application

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Smith, Robert G., Barnes, Michael W.
• Application Number:
  US10/378,750
• Publication Number:
  US 20040173922A1
• Time in Patent Office: Days
• US Class Current: 264/3.1
• CPC Class Codes: C06B 21/0008 Compounding the ingredient
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

A method for preparing pyrotechnics oxidized by basic metal nitrate is provided wherein basic metal nitrate is formed in an aqueous slurry to which is added at least one additional pyrotechnic ingredient including at least one fuel material to form a pyrotechnic mixture. The so-formed pyrotechnic mixture is then dried to form a pyrotechnic powder and such may, if desired, be appropriately formed or shaped to assist or facilitate use in inflator devices such as used in vehicle occupant safety restraint systems.

Claims

1. A method for preparing a pyrotechnic at least in part oxidized by at least one basic metal nitrate, the method comprising:

forming the at least one basic metal nitrate in an aqueous slurry;

including, in the aqueous slurry, at least one additional pyrotechnic ingredient including at least one fuel material to form a pyrotechnic mixture; and

drying the pyrotechnic mixture to form a pyrotechnic powder.

2. The method of claim 1 wherein the at least one basic metal nitrate is selected from the group consisting of basic copper nitrate, basic cobalt nitrate, basic zinc nitrate, basic chromium nitrate, basic nickel nitrate and combinations thereof.

3. The method of claim 1 wherein the at least one additional pyrotechnic ingredient is included in the aqueous slurry prior to the forming of the at least one basic metal nitrate.

4. The method of claim 3 wherein the at least one additional pyrotechnic ingredient includes nitrate as a common ion.

5. The method of claim 4 wherein the at least one additional pyrotechnic ingredient is guanidine nitrate.

6. The method of claim 3 wherein a second at least one additional pyrotechnic ingredient is included in the aqueous slurry subsequent to the forming of the at least one basic metal nitrate.

8. The method of claim 1 comprising including at least one co-oxidizer material in the aqueous slurry.

9. The method of claim 1 comprising including at least one oxide gas generant additive material in the aqueous slurry.

10. The method of claim 9 including in the aqueous slurry an oxide gas generant additive material selected from the group consisting of silicon dioxide, aluminum oxide, titanium dioxide, zinc oxide and combinations thereof.

11. The method of claim 1 wherein the at least one basic metal nitrate is basic copper nitrate.

12. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

3Cu(OH)₂+Cu(NO₃)₂2Cu₂(OH)₃NO₃

13. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

4Cu(OH)₂+2HNO₃2Cu₂(OH)₃NO₃+2H₂O.

14. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

2Cu(NO₃)₂+3[Cu(OH)₂.CuCO₃]+3H₂O4Cu₂(OH)₃NO₃+3CO₂.

15. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

2[Cu(OH)₂.CuCO₃]+2HNO₃2Cu₂(OH)₃NO₃+2CO₂.

16. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

4CuO+2HNO₃+2H₂O2Cu₂(OH)₃NO₃.

17. The method of claim 11 wherein the forming of the basic copper nitrate in an aqueous slurry comprises the following reaction:

Cu(NO₃)₂+3CuO+3H₂O2CU₂(OH)₃NO₃.

18. The method of claim 1 wherein the at least one fuel material included in the aqueous slurry is guanidine nitrate.

19. The method of claim 1 wherein the drying of the mixture to form a pyrotechnic powder comprises spray drying.

20. The method of claim 1 additionally comprising:

forming the pyrotechnic powder into a desired form.

21. The method of claim 20 wherein the pyrotechnic powder is pressed-form into tablets.

22. The method of claim 20 wherein the pyrotechnic powder is pressed-form into wafers.

7. The method of claim I wherein the at least one additional pyrotechnic ingredient is included in the aqueous slurry subsequent to the forming of the at least one basic metal nitrate.

23. A method for preparing a pyrotechnic at least in part oxidized by basic copper nitrate, the method comprising:

forming basic copper nitrate in an aqueous slurry via a reaction selected from the group consisting of;

1. 3Cu(OH)₂+Cu(NO₃)₂2Cu₂(OH)₃NO₃;

2. 4Cu(OH)₂+2HNO₃2Cu₂(OH)₃NO₃+2H₂O;

3. 2Cu(NO₃)₂+3[Cu(OH)₂.CuCO₃]+3H₂O4Cu₂(OH)₃NO₃+3CO₂;

4. 2[Cu(OH)₂.CuCO₃]+2HNO₃2Cu₂(OH)₃NO₃+2CO₂;

5. 4CuO+2HNO₃+2H₂O2Cu₂(OH)₃NO₃; and

6. Cu(NO₃)₂+3CuO+3H₂O2CU₂(OH)₃NO₃;

adding, to the aqueous slurry, additional pyrotechnic ingredients including at least one fuel material and at least one oxide additive selected from the group consisting of silicon dioxide, aluminum oxide, titanium dioxide, zinc oxide and combinations thereof to form a mixture;

spray-drying the mixture to form a pyrotechnic powder; and

press-forming the pyrotechnic powder into a desired form.

24. The method of claim 23 wherein at least one of the additional pyrotechnic ingredients is included in the aqueous slurry prior to the forming of the basic copper nitrate.

25. The method of claim 24 wherein the at least one of the additional pyrotechnic ingredients included in the aqueous slurry prior to the forming of the basic copper nitrate includes nitrate as a common ion.

26. The method of claim 25 wherein the at least one of the additional pyrotechnic ingredients included in the aqueous slurry prior to the forming of the basic copper nitrate is guanidine nitrate.

27. The method of claim 23 wherein at least one of the additional pyrotechnic ingredients is included in the aqueous slurry subsequent to the forming of the basic copper nitrate.

28. The method of claim 23 comprising including at least one co-oxidizer material in the aqueous slurry.

29. The method of claim 23 wherein the at least one fuel material added to the aqueous slurry is guanidine nitrate.

30. The method of claim 23 wherein the pyrotechnic powder is pressed-form into tablets.

31. The method of claim 23 wherein the pyrotechnic powder is pressed-form into wafers.