Classifications

• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
  • C06B21/0033—Shaping the mixture
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
  • C06B23/005—Desensitisers, phlegmatisers
• • 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 invention relates to a method for producing phlegmatized, high-energy explosives, in particular hexogen (RDX) or octogen (HMX), as a component of plastic-bound explosives or propellant charge powder, in that the particulate explosive is coated with a desensitizing polymer from an aqueous phase.
• RDX hexogen
• HMX octogen
• Hexogen and octogen are characterized by a high energy or explosiveness for their use, which, however, poses considerable problems for processing.
• the high sensitivity to friction and impact leads to a correspondingly high security risk.
• This security risk is the higher, ever the grain size distribution is wider and the larger the coarse grain fraction, since single grain detonations can then occur, for example, in propellant grains.
• Such single-grain detonations are also undesirable in use, particularly when used in Lova-TLP.
• the coarse grain fraction leads, for example, to intermittent burns in the case of TLP combustion interruptions, as a result of which the geometry of the propellant charge body changes in an uncontrolled manner and the combustion behavior and the ballistics are thus negatively influenced.
• any water moisture that may still be present is granulated in the same mixer.
• a wax is proposed as a desensitizer, which is dissolved in perchlorethylene.
• Graphite powder is also used added, which also has a desensitizing effect, in particular prevents electrostatic charges.
• a high-energy explosive produced in this way has a broad grain distribution with a high proportion of coarse grain, which not only shows the above-mentioned disadvantages in processing, but is also responsible for certain technical defects.
• These explosives cannot be added to the otherwise very advantageous processing of propellant powders and explosive mixtures in extruders, in particular twin screw extruders, since the security risk is too great.
• the invention has for its object to propose a method of the type mentioned, which on the one hand does not require environmentally harmful solvents, and on the other hand leads to desensitized explosives with low sensitivity to friction.
• This object is achieved in that the particulate explosive with a particle size of up to 20 microns slurried with the polymer in aqueous dispersion, the slurries applied to a rotating, heated roller, the application dried at a temperature> 100 ° C without pressure and after drying is scraped off the roller.
• the process according to the invention can be carried out continuously and does not require any special precautions for workplace or environmental protection, since work is carried out in the aqueous phase.
• a homogeneous dispersion can be achieved, which can be applied to the roller without any safety risk and which is dried without pressure by mere evaporation.
• the explosive particles are coated homogeneously with the polymer.
• the polymer used for desensitization preferably also forms the plastic binder for the finished explosive or the finished propellant charge powder, the polymer being added in the amount or a part thereof required for the end product.
• the polymer from the group of styrene-1,3-butadiene-acrylonitrile and vinyl propionate-acrylate, the polymer preferably being used in a 50 to 55% strength aqueous dispersion.
• polyvinyl alcohol can also be used as the polymer, the aqueous dispersion additionally containing glycerol.
• a surface-active additive is preferably added to the aqueous dispersion.
• a surface-active additive for example, highly disperse, amorphous silicon dioxide can be used as the surface-active additive.
• the aforementioned additive prevents the formation of vapor bubbles, which in turn will cause the layer to crack open and possibly flake off. Furthermore, the flowability and the quality of the order is improved.
• Adequate phlegmatization is obtained when the explosive is slurried with 5 to 25% by weight of polymer in aqueous dispersion.
• the explosive is preferably used with a grain size of up to 10 ⁇ m, the grain size spectrum also being able to be in the range between 3 and 5 ⁇ m.
• the slurry applied to the roller is preferably dried at a roller temperature between 110 ° C. and 150 ° C., preferably ⁇ 140 ° C., which enables relatively short residence times to be achieved. These can be, for example, in the range of 60 s and a little more if a roller of at least 150 cm is used and the layer thickness is ⁇ 10 mm.
• An inventive desensitized RDX with a higher polymer content e.g. B. in the range of 15 to 25% can be used directly as basic granules in the extrusion of LOVA propellant powder.
• a test series with hexogen (RDX) with a grain size of 10 ⁇ m and various polymers is shown in Table I in accordance with the annex, and the friction sensitivity and impact sensitivity determined in each case are listed.
• the desensitizers are shown in capital letters, which are explained in the footnote to the table.
• the example shows similarly good results in terms of sensitivity to friction with 75% by weight RDX and 25% by weight polymer A dispersed in water.
• the impact sensitivity in this case is 0.35 kgm.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Lubricants (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=6429315

Family Applications (1)

Country Status (3)

Cited By (8)

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Citations (8)

Family Cites Families (17)

• 1991
  • 1991-04-11 DE DE4111752A patent/DE4111752C1/de not_active Expired - Fee Related
• 1992
  • 1992-02-07 DE DE59202779T patent/DE59202779D1/de not_active Expired - Fee Related
  • 1992-02-07 EP EP92102032A patent/EP0509200B1/fr not_active Expired - Lifetime
• 1993
  • 1993-08-16 US US08/106,789 patent/US5547527A/en not_active Expired - Fee Related

Patent Citations (8)

Non-Patent Citations (1)

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