Abstract:
High-energetic explosive and propellant compositions having decreased detonation sensitivity are provided. To enhance the specific impulse of these formulations and ensure detonation desensitization, the highly-energetic oxidizer 1,9-dinitrato-2,4,6,8-tetranitrazanonane is utilized.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to high-energy explosive or propellant compositions, and is particularly directed to energetic formulations having reduced sensitivity to detonation and improved mass impetus. 
     2. Description of Related Art 
     High-energy explosives and propellants are generally formulated utilizing a high-energy binder and oxidizer, together with suitable plasticizers. In prior formulations, high-energetic oxidizers such as cyclotetramethylenetetranitramine (HMX) have been utilized. However, such conventional oxidizers when utilized in explosives and solid propellants have detrimentally increased sensitivity to detonation. 
     BRIEF SUMMARY AND OBJECTS OF THE INVENTION 
     Accordingly, to maintain or improve the high energy potential or specific performance of explosives or propellant formulations and acceptable impetus levels while concurrently reducing detonation sensitivity, the present invention is directed to performance-improved, less detonation-sensitive formulations. 
     The advantages of the present invention are realized in explosive and propellant formulations utilizing a select oxidizer in combination with high-energy constituents. 
     Accordingly, an object of the present invention is to provide improved high-energy explosive and propellant composites. 
     Another object of the present invention is to provide high-energy explosive and propellant composite compositions having a lessened detonation sensitivity and enhanced specific performance. 
     These and other objects and features of the present invention will be apparent from the following detailed description. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The high-energy explosive and propellant composites or compositions of the present invention are characterized by the utilization of highly energetic and impact desensitized components, including a solid highly-energetic ingredient oxidizer 1,9-dinitrato-2,4,6,8-tetranitrazanonane. 
     In addition to the aforementioned oxidizer, the propellant formulations or composites of the present invention also contain at least 20% by weight of a highly energetic plasticizer and at least 10% by weight of a polymeric binder, preferably a hydroxy-terminated aliphatic polyether binder. A preferred hydroxy-terminated aliphatic polyether binder (GAP) used in the practice of the present invention is disclosed and claimed in U.S. Pat. No. 4,268,450 incorporated herein by reference. 
     Known plasticizers which may be utilized in the high-energy explosive or propellant composites taught herein preferably include trimethylolethanetrinitrate and 4,4,4-trinitrobutyl nitrate. The solid highly-energetic oxidizer ingredient 1,9-dinitrato-2,4,6,8-tetranitrazanonane is further characterized in Table I below. 
     
                       TABLE I______________________________________NAME:           1,9-DINITRATO-2,4,6,8-TETRA-           NITRAZANONANESTRUCTURE:            ##STR1##FORMULA:        C.sub.5 H.sub.10 N.sub.10 O.sub.14MOLECULAR WEIGHT:           434M.P. (°C.):           202-203IMPACT SENSITIVITY:           28-30 (HMX = 14-15)(in-lb)WEIGHT LOSS %:  0.94(112 hrs @ 74° C.)ΔH.sub.f (Kcal/mole):           -55______________________________________ 
    
     In order to compare the high-energy explosive or propellant composites of the present invention with known composite formulations, Table II is provided hereinbelow. In Table II, formulations utilizing conventional highly-energetic oxidizer cyclotetramethylenetetranitramine (HMX) are compared to formulations utilizing the preferred oxidizer 1,9-dinitrato-2,4,6,8-tetranitrazanonane (DNTNN) in combination with a suitable plasticizer (TMETN/TNBNT) and binder (GAP). As shown, the specific impulse of formulations defined by the use of the preferred highly-energetic oxidizer ingredient of the present invention display a substantially higher specific impulse than the formulations utilizing the conventional HMX. 
     
                       TABLE II______________________________________FORMULATIONSHMX    DNTNN     TMETN     TNBNT   GAP   I.sub.sp______________________________________70     --        20        --      10    25370     --        --        20      10    258--     70        20        --      10    261--     70        --        20      10    265______________________________________ 
    
     wherein HMX and DNTNN are as defined above; TMETN is trimethylolethanetrinitrate; TNBNT is 4,4,4.trinitrobutyl nitrate; and GAP is glycidyl azide polymer. 
     Obviously, numerous variations and modifications may be made without departing from the present invention. Accordingly, it should be clearly understood that the embodiments of the present invention disclosed hereinabove are not intended to limit the scope of the present invention.