Gas-generating pyrotechnical compositions and pyrotechnical compounds for automotive safety

Abstract

The present invention provides a pyrotechnic gas generating composition and pyrotechnic compounds able to be obtained from said composition. Said composition comprises basic copper nitrate, guanidine nitrate, a specific additional reducing charge, and/or a specific additional oxidizing charge as well as a specific binder.

1 . A pyrotechnic gas-generating composition comprising an oxidizing charge constituted by basic copper nitrate (BCN), a reducing charge constituted by guanidine nitrate (GN) and a binder, the composition being characterized in that it also comprises: 
 an additional reducing charge selected from the group formed by hexogene (RDX), octogene (HMX), penthrite (PETN), triaminoguanidine nitrate (TAGN), nitroguanidine, 3-nitro-1,2,4-triazol-5-one (ONTA) and mono- and bi-tetrazoles; and/or, advantageously and    an additional oxidizing charge which forms a solid solution obtained by substitution with guanidine nitrate (GN); and 
 in that the binder, which is hydrosoluble, is based on a mixture of at least one carboxymethylcellulose with a high molecular mass and at least one carboxymethylcellulose with a low molecular mass, in a mass ratio in the range 95/5 to 60/40.  
   
   
   
       2 . The composition according to  claim 1 , characterized in that the basic copper nitrate (BCN) is present in a mass fraction in the range 50% to 60% of the total composition mass.  
   
   
       3 . The composition according to  claim 1 , characterized in that the guanidine nitrate (GN) is present in a mass fraction in the range 20% to 40% of the total composition mass.  
   
   
       4 . The composition according to  claim 1 , characterized in that the additional reducing charge is hexogene (RDX) or octogene (HMX).  
   
   
       5 . The composition according to  claim 1 , characterized in that additional reducing charge is present in a mass fraction of less than 15% with respect to the total composition mass.  
   
   
       6 . The composition according to  claim 1 , characterized in that the additional oxidizing charge which is present is selected from the group formed by ammonium perchlorate, potassium perchlorate, ammonium nitrate, sodium nitrate and potassium nitrate.  
   
   
       7 . The composition according to  claim 1 , characterized in that the additional oxidizing charge which is present is selected from the group formed by ammonium perchlorate and potassium perchlorate; and in that said additional oxidizing charge advantageously consists of ammonium perchlorate.  
   
   
       8 . The composition according to  claim 1 , characterized in that the additional oxidizing charge is present in a mass fraction of less than 15% of the total composition mass.  
   
   
       9 . The composition according to  claim 1 , characterized in that the binder is present in a mass fraction in the range 2% to 15% of the total composition mass.  
   
   
       10 . Pyrotechnic compounds able to be obtained from a composition according to  claim 1 .  
   
   
       11 . The pyrotechnic compounds according to  claim 10 , manufactured and formed by a pelletization or disk compression process.  
   
   
       12 . The pyrotechnic compounds according to  claim 10 , manufactured and formed by an extrusion process.  
   
   
       13 . The pyrotechnic compounds according to  claim 10 , of the monolithic, mono- or multi-perforated type.  
   
   
       14 . The pyrotechnic compounds according to  claim 12 , of the mono- or multi-perforated type.