Pyrotechnic gas generator compounds
The main subject of the present invention is solid pyrotechnic gas generator compounds, the composition of which contains: guanidine nitrate, basic copper nitrate, and at least one inorganic titanate, the melting point of which is above 2100 K. Said compounds are perfectly suitable for use in frontal airbags.
1. A gas-generating pyrotechnic solid compound, the composition of which contains:
guanidine nitrate,
basic copper nitrate, and
at least one inorganic titanate whose melting point is greater than 2100 K, selected from the group consisting of strontium titanate (SrTiO 3 ), calcium titanate (CaTiO 3 ) and aluminum titanate (Al 2 TiO 5 ).
2. The compound as claimed in claim 1 , wherein its composition, expressed as weight percentages, contains between 1% and 5% of said at least one inorganic titanate.
3. The compound as claimed in claim 1 , wherein its composition consists, for at least 99.5% by weight, of said guanidine nitrate, basic copper nitrate and inorganic titanate(s).
4. The compound as claimed in claim 1 , wherein its composition, expressed as weight percentages, contains:
45% to 60% of guanidine nitrate,
37% to 52% of basic copper nitrate, and
1% to 5% of said at least one inorganic titanate whose melting point is greater than 2100 K.
5. The compound as claimed in claim 1 , wherein said at least one inorganic titanate has a median diameter of less than 5 μm.
6. The compound as claimed in claim 1 , which is obtained via a dry-route process, which comprises a step of compacting of a pulverulent mixture containing its constituent ingredients in powder form, optionally followed by a granulation step, which is itself optionally followed by a step of forming by pelletization.
7. The compound as claimed in claim 1 , which is in the form of granules, pellets or monolithic blocks.
8. A pulverulent composition, which is a precursor of a compound as claimed in claim 1 , the composition of which corresponds to that of a compound as claimed in claim 1 .
9. A gas generator, containing a gas-generating pyrotechnic solid charge, wherein said charge contains at least one compound as claimed in claim 1 .
10. The compound as claimed in claim 1 , wherein its composition, expressed as weight percentages, contains between 2% and 4% of said at least one inorganic titanate.
11. The compounds as claimed in claim 1 , wherein its composition consists for 100% by weight of said guanidine nitrate, basic copper nitrate and inorganic titanate(s).
12. The compound as claimed in claim 1 , wherein its composition, expressed as weight percentages, contains:
45% to 60% of guanidine nitrate,
37% to 52% of basic copper nitrate, and
2% to 4% of said at least one inorganic titanate whose melting point is greater than 2100 K.
13. The compound as claimed in claim 1 , wherein said at least one inorganic titanate has a median diameter of less than 1 μm.
14. The compound as claimed in claim 1 , wherein its composition, expressed as weight percentages, consists, for at least 99.5% by weight, of:
45% to 60% of guanidine nitrate,
37% to 52% of basic copper nitrate, and
1% to 5% of said at least one inorganic titanate whose melting point is greater than 2100 K.
15. The compound as claimed in claim 1 , which consists of:
45% to 60% of guanidine nitrate,
37% to 52% of basic copper nitrate, and
1% to 5% of said at least one inorganic titanate whose melting point is greater than 2100 K.
16. A gas-generating pyrotechnic solid compound, the composition of which contains:
guanidine nitrate,
basic copper nitrate, and
at least one inorganic titanate whose melting point is greater than 2100 K and having a median diameter of less than 5 μm.
17. The compound of claim 16 , wherein said at least one inorganic titanate has a median diameter of less than 1 μm.