GAS-GENERATING PYROTECHNIC PRODUCTS
The subject of the present invention is a pyrotechnic gas-generating product, the composition of which comprises: guanidine nitrate, basic copper nitrate, and potassium perchlorate. Characteristically, said potassium perchlorate represents between 8% and 20% of the total weight of said pyrotechnic product and said composition additionally contains at least one oxide, chosen from metal oxides, metalloid oxides and mixtures thereof; said at least one oxide having a melting point below the combustion temperature of said pyrotechnic product and said at least one oxide representing between 1% and 5% of the total weight of said pyrotechnic product. Said at least one oxide improves the combustion, at low pressure, of said pyrotechnic product.
1 . A pyrotechnic gas-generating product, the composition of which comprises:
guanidine nitrate,
basic copper nitrate, and
potassium perchlorate,
wherein said potassium perchlorate represents between 8% and 20% of the total weight of said pyrotechnic product; and
said composition additionally contains at least one oxide, chosen from metal oxides, metalloid oxides and mixtures thereof; said at least one oxide representing between 1% and 5% of the total weight of said pyrotechnic product and having a melting point below the combustion temperature of the pyrotechnic product.
2 . The product as claimed in claim 1 , wherein said potassium perchlorate represents between 10.5% and 20% of the total weight of said pyrotechnic product.
3 . The product as claimed in claim 1 , wherein said melting point of said at least one oxide is at least 50 K below said combustion temperature of said pyrotechnic product.
4 . The product as claimed in claim 1 , wherein said at least one oxide is chosen from silicon oxide (SiO 2 ), tungsten oxide (WO 3 ) and molybdenum oxide (MoO 3 ),
5 . The product as claimed in claim 4 , wherein said at least one oxide consists of silicon oxide.
6 . The product as claimed in claim 1 , wherein its composition comprises, expressed as weight percentage:
from 50% to 65% of guanidine nitrate,
from 20% to 40% of basic copper nitrate,
from 8% to 20%, advantageously from 10.5% to 20%, of potassium perchlorate, and
from 1% to 5%, advantageously from 1% to 3%, of said at least one oxide.
7 . The product as claimed in claim 1 , wherein it is obtained by a dry process that comprises a step of compacting a pulverulent mixture containing its constituent ingredients as powder, optionally followed by a step of granulation, itself followed, if necessary, by a step of forming via pelletizing.
8 . The product as claimed in claim 1 , wherein it is in the form of granules, pellets or blocks.
9 . A gas generator, suitable for an airbag, wherein it contains at least one product as claimed in claim 1 .
10 . The product as claimed in claim 2 , wherein said melting point of said at least one oxide is at least 50 K below said combustion temperature of said pyrotechnic product.
11 . The product as claimed in claim 1 , wherein its composition comprises, expressed as weight percentage:
from 50% to 65% of guanidine nitrate,
from 20% to 40% of basic copper nitrate,
from 10.5% to 20% of potassium perchlorate, and
from 1% to 5% of said at least one oxide.
12 . The product as claimed in claim 11 , wherein said at least one oxide is chosen from silicon oxide (SiO 2 ), tungsten oxide (WO 3 ) and molybdenum oxide (MoO 3 ).
13 . The product as claimed in claim 12 , wherein said at least one oxide consists of silicon oxide.
from 20% to 40% of basic copper nitrate,
from 10.5% to 20% of potassium perchlorate, and
from 1% to 5% of said at least one oxide.
12 . The product as claimed in claim 11 , wherein said at least one oxide is chosen from silicon oxide (SiO 2 ), tungsten oxide (WO 3 ) and molybdenum oxide (MoO 3 ).
13 . The product as claimed in claim 12 , wherein said at least one oxide consists of silicon oxide.