Enhanced thermal and ignition stability azide gas generant intermediates
First Claim
1. An intermediate slurry product made from a wet-ground mixture of a generant azide and an oxidizer/reactant therefor having a hydrazoic acid content of less than about 3×
- 10EXP(-3) moles per liter, a pH of greater than 8.0 up to about 12.5, and impurity metal ions selected from the group consisting of Ca, Mg, Pb, Fe, Mn, Cu and mixtures thereof, each of said metal ions being in a concentration level below about 25 ppm.
1 Assignment
0 Petitions
Accused Products
Abstract
Slurry and spray dried azide-based gas generant intermediates are made having a hydrazoic acid content of less than about 3×10 EXP(-3) M/L, a pH of greater than 8.0 up to about 12.5, and impurity metal ions Ca, Mg, Pb, Fe, Mn and Cu, each below about 25 ppm. These intermediates are made by slurrying powdered ingredients of the azide and oxidizer/reactant in water, wet grinding the slurry and spray drying to form a particulate material which is molded into pellets or tablets which are useful as the gas generant in vehicle crash bags or inflators. The basicity of the water is adjusted to a pH of greater than 8.0 up to about 12.5, preferably about 10, by the addition of a base, such as NaOH, followed by the addition of such solid ingredients as S, MoS2 and NaN3, and preferably the NaN3 is added last, whereby hydrazoic acid production is minimized. The contaminant Ca and Mg ions are minimized by softening the water supplied. Impurity ions are also minimized by being precipitated as non-hazardous compounds by adding such agents as sodium sulfide and tri-sodium phosphate to the slurry. Impurities in the MoS2 feed may be further minimized by chemical leaching purification.
-
Citations
20 Claims
-
1. An intermediate slurry product made from a wet-ground mixture of a generant azide and an oxidizer/reactant therefor having a hydrazoic acid content of less than about 3×
- 10EXP(-3) moles per liter, a pH of greater than 8.0 up to about 12.5, and impurity metal ions selected from the group consisting of Ca, Mg, Pb, Fe, Mn, Cu and mixtures thereof, each of said metal ions being in a concentration level below about 25 ppm.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 18, 19, 20)
-
8. An intermediate spray dried product made from a wet-ground mixture of a generant azide and an oxidizer/reactant therefor having a hydrazoic acid content of less than about 3×
- 10EXP(-3) moles per liter, a pH of greater than 8.0 up to about 12.5, and containing impurity metal ions selected from the group consisting of Ca, Mg, Pb, Fe, Mn, Cu and mixtures thereof, each of said metal ions being in a concentration level below about 25 ppm.
- View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
Specification