Inhibitors for cone-free end-burning of double base propellant grains
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0087851
(1987-08-20)
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발명자
/ 주소 |
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출원인 / 주소 |
- The United States of America as represented by the Secretary of the Navy
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대리인 / 주소 |
Townsend, William C.Skeer, W. Thom
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인용정보 |
피인용 횟수 :
1 인용 특허 :
1 |
초록
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A double base propellant grain inhibitor is comprised of a hydroxyl-termied polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecule and an approximate molecular weight of 2800 to 3600, an inert filler, a cross-linking agent, a thickening agent, an antioxidant, a curative
A double base propellant grain inhibitor is comprised of a hydroxyl-termied polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecule and an approximate molecular weight of 2800 to 3600, an inert filler, a cross-linking agent, a thickening agent, an antioxidant, a curative, and a catalyst. When properly applied to the surface of a propellant grain, the inhibitor bond does not weaken with age and the inhibitor produces planar, no-cone grain burning having a constant chamber pressure during the burning of the propellant grain. A 1,4-butylene oxide-type polyether barrier layer consisting of a poly-1,4-butylene oxide diisocyanate with an approximate molecular weight of 850 to 1000, a diol curative, a triol cross-linker, and antioxidant and a cure catalyst can be added between the propellant grain and inhibitor to reduce propellant plasticizer migration.
대표청구항
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1. A double-base end-burning propellant grain inhibitor comprising: a hydroxyl-terminated polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecule, and a molecular weight of approximately 2800 to 3600; a triol cross-linker; an inert filler; a thickening agent; an an
1. A double-base end-burning propellant grain inhibitor comprising: a hydroxyl-terminated polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecule, and a molecular weight of approximately 2800 to 3600; a triol cross-linker; an inert filler; a thickening agent; an antioxidant; a curative; and a catalyst, so that said double base propellant grain inhibitor, when applied to the surface of a double base propellant grain, wiill produce planar, no-cone grain burning with constant chamber pressure during the burning of said propellant grain. 2. The propellant grain inhibitor of claim 1 wherein said inert filler comprises about 2 percent by weight fumed silica thickening agent and about 22 percent by weight titanium dioxide, said cross-linking agent is triethanolamine, said antioxidant is 2,2'-methylenebis-(4-methyl-6-tertiarybutyl phenol), said curative is toluenediisocyanate, and said catalyst is dibutyltin dilaurate. 3. A double-base end-burning propellant grain inhibitor comprising: about 65.5 percent by weight of a hydroxyl-terminated polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecular, and an approximate molecular weight of 2800 to 3600; about 24 percent by weight of an inert filler, said inert filler comprising about 2 percent by weight fumed silica and about 22 percent by weight titanium dioxide; about 1.8 percent by weight of triethanolamine cross-linking agent; about 0.6 percent by weight of 2,2'-methylenebis-(4-methyl-6-tertiarybutyl phenol) antioxidant; about 8.0 percent by weight of toluenediisocyanate curative; and about 0.04 percent by weight of dibutyltin dilaurate catalyst. 4. A method of inhibiting an end-burning double-base propellant grain comprising the steps of: applying an adhesion promoter to a propellant grain, said adhesive promoter being a 10 percent by weight solution of the biuret trimer of hexamethylene diisocyanate in methylene chloride solvent; mixing an inhibitor premix with curative and a catalyst to form a propellant grain inhibitor; and applying said propellant grain inhibitor to said propellant grain for a total thickness of inhibitor sufficient to produce a planar, no-coning grain burning having a constant chamber pressure during the burning of said propellant grain. 5. The method of claim 4 wherein a barrier layer is applied to said propellant grain after said adhesion promoter is applied and before said propellant grain inhibitor is applied. 6. The method of claim 5 wherein said barrier layer comprises: about 90.8 percent by weight of a diisocyanate-terminated 1,4-butylene oxide-type polyether; about 4.6 percent by weight of 1,4-butanediol curative; about 4.5 percent by weight of trimethylolpropane cross-linker; about 0.1 percent by weight of 2,2'-methylenebis-(4-methyl-6-tertiarybutyl phenol) antioxidant; and about 0.02 percent by weight of dibutyltin dilaurate catalyst, so that the NCO/OH equivalent ratio is from 1.00 to 1.02, excluding the antioxidant. 7. The method of claim 6 wherein said diisocyanate-terminated polymer is poly-1,4-butylene oxide diisocyanate with a molecular weight of approximately 850 to 1000. 8. The method of claim 4 wherein said inhibitor premix comprises: about 71 percent by weight of a hydroxyl-terminated polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecular, and a molecular weight of approximately 2800 to 3600; about 26 percent by weight of an inert filler, said inert filler comprising about 2 percent by weight fumed silica and about 22 percent by weight titanium dioxide; about 2 percent by weight of triethanolamine cross-linking agent; and about 0.6 percent by weight of 2,2'-methylenebis-(4-methyl-6-tertiarybutyl phenol) antioxidant. 9. The method of claim 4 wherein said propellant grain inhibitor comprises: about 92 percent by weight inhibitor premix; about 8.0 percent by weight of toluene diisocyanate curative; and about 0.04 percent by weight of dibutyltin dilaurate catalyst, so that the NCO/OH equivalent ratio is from 1.00 to 1.02, excluding the antioxidant.
이 특허에 인용된 특허 (1)
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Hackett Clarence Bertram (Kilmarnock SC) Jack James (Troon SC) Reynolds Richard Paton (Largs SC), Surface-inhibited propellent charge.
이 특허를 인용한 특허 (1)
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Hutchens Dale E. ; Cohen Norman, Low smoke rocket motor liner compositions.
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