Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
  • F42B5/02—Cartridges, i.e. cases with charge and missile
  • F42B5/18—Caseless ammunition; Cartridges having combustible cases
  • F42B5/192—Cartridge cases characterised by the material of the casing wall
  • F42B5/196—Coatings
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
  • C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones

Definitions

• the present invention is concerned with combustible propellant containers, such as sleeves or cartridges, whose temperature resistance is improved. At the same time, mechanical properties of these containers are also improved.
• the object was therefore to develop combustible containers for propellant charge powders which are as temperature-resistant as possible and at the same time have mechanical property values which are at least equivalent to those of known containers. Furthermore, the container should burn off without residues and not negatively affect the energy balance of the entire combustion system.
• combustible propellant charge containers which are provided with a surface coating and are characterized by a coating with a nitramine known as an explosive and which is embedded in a binder.
• nitramines to be used are those which are known per se as explosives, have a detonation speed of more than 7,400 m / s and, when burned, deliver a high normal gas volume, preferably more than 650 l / kg (measured by the CIT method). Furthermore, they should have deflagration points above 200 ° C, preferably above 230 ° C.
• Nitramines that meet these conditions are e.g. Cyclotrimethylene trinitramine (hexogen) or the cyclotetramethylene tetramine (octogenes).
• Suitable liquid binders are those liquid resins which have a desensitizing effect on the nitramines, so that they do not detonate, but rather uniformly burn down. The resins are also said to cure when standing in the air. Resins with such properties are known per se to the person skilled in the art. Resins based on polyvinyl alcohol, polyvinyl acetal, polybutadiene or polyacrylates may be mentioned as examples.
• the proportion of binders in the coating can vary between 5 and 20% by weight, depending on the type of resin used. It is preferably between 10 and 15% by weight, especially if a polyvinyl acetal resin is used as the binder.
• the thickness of the coatings depends on the respective application and the components used; it can vary between 0.1 and 1.0 mm, preferably it is between 0.2 and 0.5 mm.
• the application is carried out in a manner known per se, optionally dissolved in a suitable solvent, e.g. by spraying, dipping, rolling or brushing.
• the application can be carried out both on the sleeve which has not yet been processed as well as on a sleeve which has already been provided with a load and a projectile.
• the lacquer to be applied may also contain a plasticizer known per se.
• the coating according to the invention is always on the outer surfaces of the containers. It can also be attached to the inner wall. In any case, it burns together with the container.
• the containers which are coated according to the invention are known per se to the person skilled in the art. These are both flammable sleeves or cartridges as well as containers that can be used instead of bag loads.
• the containers preferably have a central tube for receiving an ignition reinforcement and are cylindrical or slightly conical.
• the coating according to the invention improves the cook-off behavior of the sleeves; it also protects the sleeves from the ingress of moisture and also improves the mechanical properties of the sleeves, e.g. the tensile strength, impact and impact resistance.
• a cartridge made with this sleeve moves without residue when fired in the weapon.

Landscapes

• Chemical & Material Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6308844

Family Applications (1)

Country Status (2)

Cited By (6)

Family Cites Families (6)

• 1986
  • 1986-09-03 DE DE19863630019 patent/DE3630019A1/de active Granted
• 1987
  • 1987-07-31 DE DE8787111101T patent/DE3783839D1/de not_active Expired - Fee Related
  • 1987-07-31 EP EP87111101A patent/EP0260419B1/fr not_active Expired - Lifetime

Also Published As

Similar Documents

Legal Events