IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0980571
(2010-12-29)
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등록번호 |
US-8636861
(2014-01-28)
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발명자
/ 주소 |
- Stec, III, Daniel
- Wilson, Amy
- Fuchs, Brian E.
- Mehta, Neha
- Cook, Paula
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출원인 / 주소 |
- The United States of America as represented by the Secretary of the Army
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
Secondary crystalline high explosives are disclosed which are suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms (MEMS), used as safe and arm (S&A) devices. The explosives are prepared by adding the such a high explosive to an aq
Secondary crystalline high explosives are disclosed which are suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms (MEMS), used as safe and arm (S&A) devices. The explosives are prepared by adding the such a high explosive to an aqueous first volatile mobile phase, adding such a high explosive to a non-aqueous second volatile mobile phase, mixing the first and second volatile mobile phases and then loading the combined phases into the MEMS device and allowing the aqueous and non-aqueous solvents to evaporate depositing the high explosive. Enhanced adhesion between the deposited high explosive and enhanced rheological properties can be obtained by adding a polymeric binder to both mobile phases.
대표청구항
▼
1. A method for loading a secondary crystalline energetic fill into the small volume loading holes and channels which form the firing train of a MEMS S&A explosive device, said method comprising the steps of: preparing a first volatile mobile phase of an aqueous solvent, into which a secondary explo
1. A method for loading a secondary crystalline energetic fill into the small volume loading holes and channels which form the firing train of a MEMS S&A explosive device, said method comprising the steps of: preparing a first volatile mobile phase of an aqueous solvent, into which a secondary explosive is added;preparing a second volatile mobile phase of a non-aqueous solvent or combination thereof, into which the secondary explosive is added;mixing said first and second volatile mobile phases together to form said fill;loading said fill into the holes and channels of the said MEMS S&A device;wherein the first and second volatile mobile phases evaporate and the secondary explosive is left, the secondary explosive adhering well to the holes and channels of said MEMS S&A device and having a % TMD less than 95%. 2. A method according to claim 1, wherein the combined fill has a % TMD of about 90%. 3. A method according to claim 1, a polymeric binder is added to said fill, the quantity of said binder being from 0.01 to about 10 weight percent of the energetic material, to enhance the adhesion between the crystalline secondary explosive and the holes and channels of the MEMS S&A device. 4. A method according to claim 3, wherein said quantity of said binder is from about 0.01 to about 0.5 weight percent of the energetic material. 5. A method according to claim 1, wherein a first polymeric binder is added to said first volatile mobile phase and wherein a second polymeric binder is added to said second volatile mobile phase, to avoid any thin filaments being formed when the combined fill is loaded into the holes and channels of the MEMS S&A device. 6. A method according to claim 5, wherein said first polymeric binder is selected from the group consisting of polyvinyl alcohol, polyvinyl alcohol/polyvinyl ester copolymers, polyacrylates, casein, polyvinyl alcohol/polyvinyl pyrrolidone copolymers, polyvinyl pyrrolidone, substituted polyvinyl pyrrolidone, ethylene-vinyl alcohol/acetate terpolymers, polyurethanes, styrene-maleic anhydride copolymers, epichlorohydrin-based polymers, and styrene-acrylic copolymers. 7. A method according to claim 5, wherein said second polymeric binder is selected from the group consisting of polyvinyl alcohol/polyvinyl ester copolymers, polyacrylates, polymethacrylates, poly(vinyl pyrrolidone/vinyl alcohol) copolymers, ethylene-vinyl alcohol/acetate terpolymers, polyurethanes, styrene-maleic anhydride copolymers, styrene-acrylic copolymers, epichlorohydrin-based polymers, oxetane-based polymers, substituted celluloses such as ethyl cellulose and nitrated cellulose derivatives, including the energetic polymers GAP and polyGLYN and oxetane-based polymers such as polyBAMO, polyAMMO, BAMO-AMMO copolymers, and polyNIMMO. 8. A method according to claim 1, wherein said secondary explosive is selected from the group consisting of CL-20, HMX, RDX, TNAZ, PETN, and HNS. 9. A method according to claim 1, wherein said non-aqueous solvent is selected from the group consisting of ethanol, isopropanol, texanol, dipropylene glycol n-propyl ether, and a mixture of one alcohol and an ester or ketone, such as ethyl acetate, two alcohols, or esters or ketones without a second solvent. 10. A method according to claim 1 wherein the step of loading the fill comprises placing the fill on a blade member and wiping the blade member over the fixture so as to force the slurry or paste into the loading hole in the fixture. 11. A method according to claim 1 wherein said step of loading the fill comprises placing the fill in a contained space having an outlet orifice therein, and dispensing the paste or slurry through the orifice into the hole in the fixture. 12. A method according to claim 11, wherein the method employs a pipette for dispensing the paste or slurry. 13. A method according to claim 11, wherein the method employs a syringe for dispensing the fill and a plunger of the syringe is used to force the fill through the orifice. 14. A method according to claim 11, wherein the method employs a pump for dispensing the fill. 15. A method according to claim 14, wherein said pump comprises a positive displacement pump. 16. A method according to claim 14, wherein said pump comprises a peristaltic pump. 17. A secondary crystalline energetic fill for loading into the small volume loading holes and channels of a MEMS S&A explosive device, said fill comprising: a first component of about 30 to about 32 weight percent organic solvent, about 65 to about 68 weight percent secondary crystalline energetic, and about 5 to about 1 weight percent binder;a second component of about 29 to 31 weigh percent water, about 65 to 68 weight percent secondary crystalline explosive, and about 5 to about 1 weight percent binder;wherein the fill is comprised of said first and second components in the a ratio of about 45:55 to 55:45; andwherein the fill adheres well to the holes and channels of said MEMS S&A device, has a % TMD less than 95%, and does not form strings when being loaded. 18. A fill according to claim 17, wherein the combined fill has a % TMD of about 90%. 19. A fill according to claim 17 wherein said binder is selected from the group polyvinyl alcohol, polyvinyl alcohol/polyvinyl ester copolymers, polyacrylates, casein, polyvinyl alcohol/polyvinyl pyrrolidone copolymers, polyvinyl pyrrolidone, substituted polyvinyl pyrrolidone, ethylene-vinyl alcohol/acetate terpolymers, polyurethanes, styrene-maleic anhydride copolymers, epichlorohydrin-based polymers, and styrene-acrylic copolymers, polyvinyl alcohol/polyvinyl ester copolymers, polyacrylates, polymethacrylates, polyvinyl pyrrolidone/vinyl alcohol) copolymers, ethylene-vinyl alcohol/acetate terpolymers, polyurethanes, styrene-maleic anhydride copolymers, styrene-acrylic copolymers, epichlorohydrin-based polymers, oxetane-based polymers, substituted celluloses such as ethyl cellulose and nitrated cellulose derivatives. 20. A fill according to claim 19 wherein said epichlorohydrin-based polymers include the energetic polymers GAP and polyGLYN. 21. A fill according to claim 19 wherein the oxetane-based polymers include polyBAMO, polyAMMO, BAMO-AMMO copolymers, and polyNIMMO. 22. A fill according to claim 17, wherein said secondary crystalline energetic is selected from the group consisting of CL-20, HMX, RDX, TNAZ, PETN, HNS and all crystalline polymorphs. 23. A fill according to claim 17, wherein said organic solvent is selected from the group consisting of ethanol, isopropanol, texanol, dipropylene glycol n-propyl ether, and a mixture of one alcohol and an ester or ketone, such as ethyl acetate, two alcohols, or esters or ketones without a second solvent.
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