US3676233A - Caseless propellant charge containing nitrocellulose in a synthetic resin - Google Patents

Caseless propellant charge containing nitrocellulose in a synthetic resin Download PDF

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Publication number
US3676233A
US3676233A US881307A US3676233DA US3676233A US 3676233 A US3676233 A US 3676233A US 881307 A US881307 A US 881307A US 3676233D A US3676233D A US 3676233DA US 3676233 A US3676233 A US 3676233A
Authority
US
United States
Prior art keywords
propellant
propellant charge
synthetic resin
charge containing
resins
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US881307A
Other languages
English (en)
Inventor
Theodor Netzer
Hans-Jurgen Block
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitrochemie Aschau GmbH
Original Assignee
Nitrochemie Aschau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitrochemie Aschau GmbH filed Critical Nitrochemie Aschau GmbH
Application granted granted Critical
Publication of US3676233A publication Critical patent/US3676233A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F42B5/188—Manufacturing processes therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B8/00—Practice or training ammunition
    • F42B8/12—Projectiles or missiles
    • F42B8/14—Projectiles or missiles disintegrating in flight or upon impact
    • F42B8/16—Projectiles or missiles disintegrating in flight or upon impact containing an inert filler in powder or granular form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/70—Combustilbe cartridge

Definitions

  • the compact propellant charges of the invention are comprised of at least one propellant powder homogenously admixed with an organic binder which mixture is then subjected to a rapid hardening by known casting or molding techniques to obtain a molded explosive body which upon impact of a conventional type detonator the body disintegrates into its original powder form.
  • Customary hardening agents and catalysts may be present in the mixture for molding.
  • the organic binders are preferably brittle synthetic resins.
  • suitable resins are short-chain Duroplast which can be highly cross-linked in amounts from 1 to 15%, preferably 3 to 7% (heat-hardenable resins of phenol-cresol-epoxide, polyether, polyester or polyurethane basis; nitrated Duroplasts such as nitrated methacrylic acid esters or acrylic acid esters in amount from 1 to 20%, preferably to 1%.
  • the homogeneous mixing of the binder with the propellant powder and rapid hardening provide a high degree of cross-linking.
  • the compact propellant charge of the invention has the advantage that the combustion velocity of the propellant powder can be varied depending upon the use desired.
  • the propellant charge is an element which is resistant to mechanical stresses occuring during shipping and during loading of the weapon.
  • the propellant charge can be secured directly to the projectile or can be loaded directly adjacent to the projectile base.
  • the sudden or immediate decomposition of the propellant charges of the invention and complete burning of the propellant before the projectile leaves the barrel will occur even at temperatures below 0 C.
  • the propellant charge of the invention results in an increased charge density and allows the control of a progressive or regressive combustion characteristic depending upon the powdered propellant used.
  • propellant powders examples include monobasic (nitrocellulose) or dibasic (nitrocellulos and nitroglycerin or diglycoldinitrate) and tribasic (nitrocellulose and nitroglycerine and nitroguanidine).
  • EXAMPLE I 100 gm. of propellant powder type A 502 having an explosion heat of 825 cal, per gm. were admixed with 7 gm. of an unsaturated polyester resin containing 50 to 70 mole percent of maleic acid dissolved in divinyl benzene. Fumaric acid could be used in place of maleic acid.
  • the said propellant powder is comprised of 98.4% nitrocellulose having a nitrogen content of 13.15%, 1.0% diphenylamine and 0.6% sodium oxalate which has on its surface 4.9% of dibutylphthalate, symmetrical diethyldiphenylurea(Centralite I) and 0.3% graphite.
  • a peroxide hardener and a catalyst were added thereto and mixture was poured into a mold and hardened at 5080 C.
  • the resulting cast body upon an impact equivalent to a detonation impact, disintegrates.
  • the course of combustion velocity of the above propelltant powder is as follows:
  • EXAMPLE II A mixture of 10 gm. of dinitropopylacrylate containing 4% by weight of methyl ethyl ketone peroxide and 1% by weight of a cobalt catalyst was admixed with gm. of the propellant powder of Example I. The mixture was hardened and cast in molds at elevated temperatures.
  • EXAMPLE IV A tribasic propellant powder consisting of 28% by weight of nitrocellulose having a nitrogen content of 12.6%, 22.5% by weight of nitroglycerin and 47.7% by weight of nitroguanidine, 1.5% by weight of Centralite I and 0.3% of Kryolith and having an explosion heat of 1050 cal. per gm. was processed in the same way as the powder in Example I to obtain a cast body which disintegrated upon impact.
  • the said propellant powder had a regressive combustion velocity as follows:
  • a compact propellant charge useful as an ammunition element without a casing comprising a molded mixture of a nitrocellulose containing propellant powder and 1 to 20% by weight of a brittle heat hardenable synthetic resin binder selected from the group consisting of phenolcresol epoxide resins, polyether resins, polyester resins and polyurethane resins which may be high cross-linked and resins of nitrated methacrylic acid and nitrated acrylic acid esters of alkanols of 1 to 7 carbon atoms which molded mixture will disintegrate into its original powdered elements when subjected to a detonation impact.
  • a brittle heat hardenable synthetic resin binder selected from the group consisting of phenolcresol epoxide resins, polyether resins, polyester resins and polyurethane resins which may be high cross-linked and resins of nitrated methacrylic acid and nitrated acrylic acid esters of alkanols of 1 to 7 carbon atoms which molded mixture
  • the charge of claim 1 containing ⁇ 615% by weight of a short chain resin selected from the group consisting of phenol-cresol epoxide resins, polyether resins, polyester resins and polyurethane resins which may be highly crosslinked.
  • a short chain resin selected from the group consisting of phenol-cresol epoxide resins, polyether resins, polyester resins and polyurethane resins which may be highly crosslinked.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Mold Materials And Core Materials (AREA)
US881307A 1968-11-30 1969-12-01 Caseless propellant charge containing nitrocellulose in a synthetic resin Expired - Lifetime US3676233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681811924 DE1811924C3 (de) 1968-11-30 1968-11-30 Treibladungskoerper fuer huelsenlose Munition

Publications (1)

Publication Number Publication Date
US3676233A true US3676233A (en) 1972-07-11

Family

ID=5714806

Family Applications (1)

Application Number Title Priority Date Filing Date
US881307A Expired - Lifetime US3676233A (en) 1968-11-30 1969-12-01 Caseless propellant charge containing nitrocellulose in a synthetic resin

Country Status (5)

Country Link
US (1) US3676233A (xx)
BE (1) BE741686A (xx)
DE (1) DE1811924C3 (xx)
FR (1) FR2024616A1 (xx)
GB (1) GB1291874A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770563A (en) * 1971-01-26 1973-11-06 Us Army Water-resistant consumable cartridge case
US4023996A (en) * 1973-08-09 1977-05-17 Societe Nationale Des Poudres Et Explosifs Moldable compositions comprising polyvinyl nitrate
US4279672A (en) * 1977-12-15 1981-07-21 Societe Nationale Des Poudres Et Explosifs Fragmentable propellant containing polyvinyl nitrate binder
US20120318161A1 (en) * 2011-03-09 2012-12-20 Armtec Defense Products Co. Consumable ammunition assembly having a nitroguanidine case and method of making a consumable ammunition assembly having a nitroguanidine case

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US694295A (en) * 1899-08-24 1902-02-25 Hudson Maxim Cartridge.
DE455382C (de) * 1919-05-27 1928-01-31 Joh Nic Ludwig Mit dem Treibmittel fest verbundenes Geschoss
FR1005318A (fr) * 1947-07-01 1952-04-09 Cartouches pour armes à feu
US3293056A (en) * 1958-03-11 1966-12-20 Walter S Baker Composition for a combustible cartridge case

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770563A (en) * 1971-01-26 1973-11-06 Us Army Water-resistant consumable cartridge case
US4023996A (en) * 1973-08-09 1977-05-17 Societe Nationale Des Poudres Et Explosifs Moldable compositions comprising polyvinyl nitrate
US4279672A (en) * 1977-12-15 1981-07-21 Societe Nationale Des Poudres Et Explosifs Fragmentable propellant containing polyvinyl nitrate binder
US20120318161A1 (en) * 2011-03-09 2012-12-20 Armtec Defense Products Co. Consumable ammunition assembly having a nitroguanidine case and method of making a consumable ammunition assembly having a nitroguanidine case
US8899155B2 (en) * 2011-03-09 2014-12-02 Armtec Defense Products Co. Consumable ammunition assembly having a nitroguanidine case and method of making a consumable ammunition assembly having a nitroguanidine case

Also Published As

Publication number Publication date
GB1291874A (en) 1972-10-04
DE1811924A1 (de) 1970-06-11
BE741686A (xx) 1970-05-14
FR2024616A1 (xx) 1970-08-28
DE1811924B2 (de) 1972-12-07
DE1811924C3 (de) 1973-07-05

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