Method for preparing anhydrous tetrazole gas generant compositions
First Claim
1. A method for preparing anhydrous gas generants comprising the steps of:
- (a) preparing a mixture of oxidizer particles having a number average particle size of about 1 micron to about 20 microns and fuel particles having a number average particle size of about 1 micron to about 100 microns wherein the fuel is at least one fuel species selected from the group consisting of tetrazoles in a medium selected from the group consisting of alcohol, ketone, water, and mixtures thereof;
(b) agglomerating the mixture to obtain particles having a weight average particle size of about 100 mesh to about 14 mesh;
(c) drying the agglomerate to obtain anhydrous particles; and
(d) shaping the anhydrous particles into a desired shape.
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Abstract
A present method involves preparing an anhydrous gas generant by forming a quantity of granulated anhydrous gas generating material into a shaped charge wherein the gas generating material is an oxidizer and at least one fuel selected from the group consisting of tetrazoles. More particularly, a preferred method involves preparing an anhydrous gas generating composition by preparing a slurry of gas generating material which comprises oxidizer particles larger than 1 micron and fuel particles larger than 1 micron wherein the oxidizer is selected from the group consisting of a metal peroxide, an inorganic nitrate, an inorganic nitrite, a metal oxide, a metal hydroxide, an inorganic chlorate, an inorganic perchlorate, or a mixture thereof, and the fuel is selected from the group consisting of tetrazoles; granulating the slurry to obtain granules of a selected weight average particle size; drying the granules to an anhydrous condition; and pelletizing the anhydrous granules.
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Citations
29 Claims
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1. A method for preparing anhydrous gas generants comprising the steps of:
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(a) preparing a mixture of oxidizer particles having a number average particle size of about 1 micron to about 20 microns and fuel particles having a number average particle size of about 1 micron to about 100 microns wherein the fuel is at least one fuel species selected from the group consisting of tetrazoles in a medium selected from the group consisting of alcohol, ketone, water, and mixtures thereof; (b) agglomerating the mixture to obtain particles having a weight average particle size of about 100 mesh to about 14 mesh; (c) drying the agglomerate to obtain anhydrous particles; and (d) shaping the anhydrous particles into a desired shape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for preparing anhydrous gas generants comprising the steps of:
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(a) preparing a mixture of oxidizer particles having a number average particle size of about 1 micron to about 20 microns and fuel particles having a number average particle size of about 10 microns to about 40 microns wherein the oxidizer is selected from the group consisting of a metal peroxide, an inorganic nitrate, an inorganic nitrite, a metal oxide, a metal hydroxide, an inorganic chlorate, an inorganic perchlorate, or a mixture thereof, the fuel is at least one tetrazole selected from the group consisting of (i) 5-aminotetrazole, a salt thereof, or a complex thereof, (ii) bis-(1(2)H-tetrazol-5-yl)-amine, a salt thereof, or a complex thereof, and (iii) a mixture thereof in at least about 20% by weight and up to about 40% by weight water; (b) granulating the mixture to obtain granules having a weight average particle size of about 100 mesh to about 14 mesh; (c) drying the granules to obtain anhydrous granules; and (d) pelletizing the anhydrous granules into pellets. - View Dependent Claims (27, 28, 29)
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Specification