Classifications

• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
  • C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
  • C06D5/06—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by reaction of two or more solids
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B25/00—Compositions containing a nitrated organic compound
  • C06B25/34—Compositions containing a nitrated organic compound the compound being a nitrated acyclic, alicyclic or heterocyclic amine

Definitions

• the present invention relates to a novel type of gas-emitting substance for that type of extreme gas generator which is employed for inflating so-called airbags in motor vehicles.
• SE-A-7 314 045-1 which describes a gas-emitting substance intended for airbag units and based on sodium azide, potassium perchlorate silica dioxide and amino tetrazol, while a corresponding gas-emitting substance based on double-base powder is described in SE-A-366 695.
• US patent specification No. 4 931 112 proposes a novel type of gas-emitting substance for airbag units in the form of the compound 5-nitro-1,2,4-triazol-3-one (NTO), a compound which is also relatively new as an explosive.
• NTO 5-nitro-1,2,4-triazol-3-one
• NTO gas-emitting substance in airbag assemblies
• NTO gas-emitting substance
• RDX hexogen
• cyclo-1,3,5-trimethylene-2,4,6-trinitramine cyclo-1,3,5-trimethylene-2,4,6-trinitramine
• RDX high-energy explosives hexogen
• HMX octogen
• the substance may include between 5 and 50 weight per cent of an energetically or non-energetically combustible plastic binder compatible with the other components such as polyurethane (PU), cellulose acetate butyrate (CAB), hydroxy-terminated polybutadiene (HTPB), ethyl cellulose (E.C), glycidyl acid polymers (GAP), polymers of 3-nitrateomethyl-3-methyl oxetane (polynimmo), or polymers of glycidyl nitrate (Polyglyn).
• PU polyurethane
• CAB cellulose acetate butyrate
• HTPB hydroxy-terminated polybutadiene
• E.C ethyl cellulose
• GAP glycidyl acid polymers
• polynimmo polymers of 3-nitrateomethyl-3-methyl oxetane
• Polyglyn polymers of glycidyl nitrate
• the product employed according to the present invention is close to two other per se known products, namely the explosives of the PBX type, i.e. "plastic bound explosives", and the so-called LOVA powders.
• the fields of use are radically different at the same time as the PBX explosives include crystalline explosives of a mean particle size of 1-2 mm, while the product according to the present invention and LOVA powder (which are considered as low-sensitive alternatives to the common nitrocellulose explosive) contain crystalline explosives of a mean particle size of between 1 and 20 ⁇ m.
• this is a basic precondition for imparting to the product suitable combustion rate.
• the crystalline explosive is used bonded with a binder to considerably larger particles, granulate or bodies than the individual explosive crystals.
• these bodies may be very large indeed, while the LOVA powder (which is primarily used as propellant charge in artillery guns and, thus, is to be combusted under deflagration and not detonated), the powder bodies employed are generally of the same size and configuration as the nitrocellulose powder which they are intended to replace, but with that difference that the available combustion area must often be increased as compared with the nitrocellulose powder, since the LOVE powder has a generally lower combustion rate than the nitrocellulose powder. For example, a larger combustion area for an explosive powder can be achieved by giving a multi cavity charge more combustion channels.
• PBX products are intended to be detonated and, in such instance, be employed in completely different configurations and contain crystalline explosives of a completely different crystal size than LOVA powder and the product employed according to the present invention
• the difference between the LOVA powder and the product employed according to the present invention primarily resides in their different respective fields of use, the LOVA powder being thus employed as a propellant primarily in artillery guns while the invention relates to a more unusual field of application for crystalline high-energy explosives, namely as a substance which, on its combustion, emits gases in an airbag unit.
• the present invention is thus based on the concept of employing one of two specific, well-known crystalline high-energy explosives as the major gas generator in accident safety units of the airbag type for private cars.
• the product according to the present invention may contain minor quantities of nitrocellulose. However, these have not proved to be capable of affecting the superior storage life of the product.
• the combustion rates of the products according to the present invention will depend, on the one hand, of those components included and in what quantities, and, on the other hand, the combustion area available on combustion and the particle size of the RDX or HMX crystals, respectively, and under what pressure the combustion takes place.
• RDX has been generally disclosed as a crystalline explosive. However, this may readily (but of course with a slightly modified combustion rate) be replaced by one or more of the crystalline high-energy explosives disclosed by way of introduction.
• the crystalline explosive must have a main particle size of between 1 and 20 ⁇ m and, preferably, about 5 ⁇ m.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Air Bags (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=20387336

Family Applications (1)

Country Status (3)

Cited By (18)

Families Citing this family (2)

Family Cites Families (9)

• 1992
  • 1992-10-02 SE SE9202854A patent/SE470480B/sv not_active IP Right Cessation
• 1993
  • 1993-09-21 EP EP19930850181 patent/EP0591119A3/fr not_active Withdrawn
  • 1993-10-01 JP JP5269547A patent/JPH06219882A/ja active Pending

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