Method for making high performance explosive formulations containing CL-20

• US 6,217,799 B1
• Filed: 10/06/1998
• Issued: 04/17/2001
• Est. Priority Date: 10/07/1997
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Innovation Systems, Inc. (Northrop Grumman Corporation)
• Original Assignee: Cordant Technologies, Inc. (Howmet Aerospace, Inc.)
• Inventors: Lee, Kenneth E., Braithwaite, Paul, Hatch, Robert L.
• Primary Examiner(s): Miller, Edward A.
• Application Number:
  US09/166,843
• Time in Patent Office: 924 Days
• Field of Search: 264/3.1, 264/3.3, 149/92
• US Class Current: 264/3.3
• CPC Class Codes: C06B 21/0083 Treatment of solid structures, e.g. for coating or impregnating with a modifier compositions therefor C06B23/00
• CPC Class Codes: C06B 45/10 the organic component containing a resin
• CPC Class Codes: C06B 45/22 the coating containing an organic compound

Abstract

A water slurry method of making high performance explosive compositions and ordnances using the explosive compositions as an explosive ingredient for high performance, low sensitivity explosive applications is disclosed. The method involves combining an aqueous dispersion including CL-20 with a lacquer including at least one non-energetic binder and at least one plasticizer, then agitating the slurry to form CL-20 granules. The CL-20 may be present in the explosive formulation in a concentration of from about 85 wt % to about 96 wt %. The formulation is preferably sufficiently pressable and/or extrudable to permit it to be formed into grains suitable for ordnance and similar applications, including use as grenades, land mines, missile warheads, and demolition explosives.

Claims

1. A method of making a pressable or extrudable explosive formulation comprising CL-20, said method comprising:

preparing an aqueous dispersion comprising ε

-polymorph CL-20 in water;

combining the aqueous dispersion with at least one plasticizer and a lacquer comprising at least one non-energetic binder and at least one solvent to form a slurry, the plasticizer optionally being contained in the lacquer;

agitating the slurry and removing the solvent to form coated granules; and

washing and drying the coated granules,

wherein the coated granules comprise from about 85 wt % to about 96 wt % CL-20, and

wherein said combining and agitating are conducted at a sufficiently low temperature and the solvent is present in a sufficient low concentration to avoid polymorph conversion of the ε

-polymorph CL-20.

2. A method according to claim 1, wherein the aqueous dispersion has a weight ratio of CL-20 to water of from about 3.0:

1 to about 5.0;

1.

3. A method according to claim 1, wherein the aqueous dispersion has a weight ratio of CL-20 to water of from about 3.5:

1 to about 4.5;

1.

4. A method according to claim 1, wherein the solvent comprises at least one member selected from the group consisting of hexane, heptane, cyclohexane, and cycloheptane.

5. A method according to claim 1, wherein the solvent comprises at least one member selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, and ethyl acetate.

6. A method according to claim 1, wherein the slurry includes a surfactant.

7. A method according to claim 6, wherein the surfactant comprises at least one member selected from the group consisting of 1-butanol and isopropyl alcohol.

8. A method according to claim 1, wherein the slurry includes a stabilizer.

9. A method according to claim 8, wherein the stabilizer comprises at least one member selected from the group consisting of diphenylamine and n-alkyl nitroanilines.

10. In a method of making an ordnance comprising a high performance, low sensitivity explosive formulation, the improvement comprising preparing a pressable or an extrudable explosive formulation comprising CL-20 in accordance with the method defined in claim 1, and pressing or extruding the explosive formulation.