EP0010009A1 - Zersplitterbare Ladungen von mit Polyvinylnitrat bekleidetem Treibpulver und Verfahren zu deren Herstellung - Google Patents
Zersplitterbare Ladungen von mit Polyvinylnitrat bekleidetem Treibpulver und Verfahren zu deren Herstellung Download PDFInfo
- Publication number
- EP0010009A1 EP0010009A1 EP79400590A EP79400590A EP0010009A1 EP 0010009 A1 EP0010009 A1 EP 0010009A1 EP 79400590 A EP79400590 A EP 79400590A EP 79400590 A EP79400590 A EP 79400590A EP 0010009 A1 EP0010009 A1 EP 0010009A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- grains
- fragmentable
- nitrocellulose
- smoothing
- 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.)
- Granted
Links
Classifications
-
- 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
- C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
- C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
- C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin
- C06B45/105—The resin being a polymer bearing energetic groups or containing a soluble organic explosive
-
- 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
- C06B45/18—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component
- C06B45/20—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component the component base containing an organic explosive or an organic thermic component
- C06B45/28—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component the component base containing an organic explosive or an organic thermic component the component base containing nitrocellulose and nitroglycerine
Definitions
- Fragmentable charges based on propellant powder grains are more and more commonly used in small and medium-caliber weapon ammunition because they allow the use, in a given volume, of a greater quantity of energetic material than that permitted with a loading of grains of propellant powder in bulk, while retaining, thanks to the ignition fragmentation, the essential characteristics of combustion of bulk loads and in particular the rapid rise in pressure in the breech of the weapon.
- the first consists in ensuring the cohesion of the powder grains by a chemical binder.
- This chemical binder can be either a crosslinkable polymer such as for example a polyurethane or a gelatinizing oil nitrocellulose such as nitroglycerin.
- this first route is far from satisfying the manufacturers of fragmentable loads. Indeed, the use of a polyurethane binder is difficult because of the difficulty there is in weighing a quantity Exact tity of pasty polymer and the slightest difference in weight leads to a variation in the ballistic performance obtained with the final block, moreover this type of fragmentable loading has shown poor dimensional stability during significant variations in temperature.
- the second way of manufacturing fragmentable charges from propellant powder in grains consists in ensuring the cohesion of the powder grains by hot compression.
- This route makes it possible to obtain much more homogeneous loadings in terms of their chemical composition and therefore having greater homogeneity and greater reliability in terms of ballistic results.
- this route is difficult to implement because nitrocellulose does not have a softening point and it is not possible to ensure the cohesion of uncoated powder grains by compression even when hot.
- the object of the present invention is to propose a simple method for manufacture of homogeneous fragmentable charges from nitrocellulose propellant powder in grains coated with a layer of polyvinyl nitrate.
- the process for manufacturing fragmentable charges of nitrocellulose propellant powder according to the invention is characterized in that, in a conventional process for the manufacture of nitrocellulose propellant powder with solvent, a smoothing operation is carried out during which one sprays on the powder grains a smoothing solution containing at least polyvinyl nitrate and a stabilizer, and in that, after evaporation of the solvent from said solution, the powder grains thus obtained are compressed between approximately 80 and 120 ° C.
- the invention also relates to the fragmentable loadings obtained using this process.
- the method according to the invention therefore makes it possible, by using a particular smoothing solution, to obtain, by a conventional method of manufacturing a propellant powder based on nitrocellulose with solvents, grains of powder which can be directly compressed, without additional handling and at temperatures much lower than the nitrocellulose decomposition temperature, in perfectly homogeneous fragmentable charges since obtained from grains of powder all identical.
- the nitrocellulose propellant powders are produced by kneading the nitrocellulose, in the presence of usual additives known to those skilled in the art, in a gelatinizing solvent which is generally an ether / ethyl alcohol mixture.
- a gelatinizing solvent which is generally an ether / ethyl alcohol mixture.
- the dough thus obtained is press spun, cut into grains, air-wrung and soaked in water so as to completely remove the solvents.
- the powder grains are then dried. They can then undergo the so-called smoothing operation during which, in a conventional process, a spray moderator such as camphor or a urea such as centralite in solution in a solvent is sprayed onto the powdered grains. Powder grains are then possible re-quenched again and dried to generally undergo final graphitization.
- the smoothing operation is therefore modified and consists in spraying the grains of propellant with nitrocellulose with a solution of polyvinyl nitrate mixed with a stabilizer which is preferably diphenylamine or 2-nitro-diphenylamine.
- the solvent used is either an aliphatic ketone-aliphatic alcohol mixture such as the acetone-ethyl alcohol mixture, or a light aliphatic ester-aliphatic alcohol mixture such as the ethyl acetate-ethyl alcohol mixture.
- the preferred mixture according to the invention is the acetone-ethyl alcohol mixture.
- the weight / alcohol weight ratio of the powder can be between 5 and 30% and preferably between 15 and 25%.
- the ketone or ester / weight ratio of the powder can be between 20% and 40% and preferably between 25% and 35%. It may be advantageous to add to the polyvinyl nitrate and to the stabilizer a plasticizer chosen from the usual plasticizers known to those skilled in the art such as dibutyl phthalate, dioctyl phthalate, dinitrotoluene, camphor, diethyldiphenylurea. According to a particular embodiment of the invention, nitrocellulose can also be added to polyvinyl nitrate. All these combinations are possible as long as the smoothing solution contains an amount of polyvinyl nitrate of between 2 and 10% of the weight of powder to be treated, and preferably between 3 and 5%.
- the smoothing solution is sprayed onto the powder at a temperature of approximately between 30 and 50 ° C.
- this spraying can be carried out in a bezel.
- the solvent is then allowed to evaporate for approximately one hour and there are thus grains of nitrocellulose propellant powder coated with an external layer rich in polyvinyl nitrate, ready to be compressed without any other particular manipulation.
- the operation of smoothing with the polyvinyl nitrate solution occurs after a conventional powder smoothing operation with a combustion moderator.
- the compression of the powder grains thus coated is carried out hot, at a temperature between 80 and 120 ° C.
- the compression pressure depends on the nature of the base powder and on the fragmentation characteristics expected from the load. For the usual fragmentable loadings intended for the ammunition for weapons of small and average gauges, a compression pressure ranging between 100 and 200 bars is in general sufficient.
- the powder grains are preheated for about ten minutes at compression temperature, they are compressed and allowed to cool in air. One thus obtains perfectly homogeneous loadings fragmentable since obtained exclusively starting from grains of powder all identical. Furthermore, the powder grains are compressed below the nitrocellulose decomposition temperature thanks to the thermoplastic polyvinyl nitrate layer which coats each powder grain.
- the temperature of the bezel was 40 ° C. We left the beverage pan, door open, for an hour.
- the powder grains thus obtained were compressed into cylindrical blocks having a central channel.
- the mold is preheated to 90 ° C.
- the powder thus coated is loaded into the mold, the powder is allowed to rise in temperature for 3 to 4 minutes, it is compressed for one minute under a pressure of 150 bars, it is removed from the mold immediately and the block is allowed to cool in air.
- Blocks having a height of 72.6 mm and a diameter of 30 mm were thus produced from 70 g of powder. These blocks were fired with or without bulk make-up powder, in a 30 mm ammunition.
- BTU 85 (0.9): single-hole nitrocellulose grain powder with single hole, potential: 850 cal / g, web: 0.9 mm
- B7T 92 (0.9): powder in grains with a simple base of nitrocellulose with 7 holes, potential: 920 cal / g, web: 0.9 mm
- the compressed loads according to the invention fragment and burn like bulk powder loads, providing ballistic results similar to those provided by bulk loads but are more efficient than the latter because that they allow the introduction into a given volume of a greater quantity of energetic matter. Furthermore, their manufacturing process is very simple and very reliable,
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Molecular Biology (AREA)
- Emergency Medicine (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7827118A FR2436766A1 (fr) | 1978-09-21 | 1978-09-21 | Chargements fragmentables de poudre propulsive enrobee de nitrate de polyvinyle et leur procede de fabrication |
FR7827118 | 1978-09-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0010009A1 true EP0010009A1 (de) | 1980-04-16 |
EP0010009B1 EP0010009B1 (de) | 1981-09-16 |
Family
ID=9212888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79400590A Expired EP0010009B1 (de) | 1978-09-21 | 1979-08-28 | Zersplitterbare Ladungen von mit Polyvinylnitrat bekleidetem Treibpulver und Verfahren zu deren Herstellung |
Country Status (7)
Country | Link |
---|---|
US (1) | US4326901A (de) |
EP (1) | EP0010009B1 (de) |
AU (1) | AU529754B2 (de) |
CA (1) | CA1156839A (de) |
DE (1) | DE2960839D1 (de) |
FR (1) | FR2436766A1 (de) |
IL (1) | IL58127A (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2576014A1 (fr) * | 1983-07-13 | 1986-07-18 | Bofors Ab | Procede de fabrication d'une poudre propulsive et substance inhibitrice de combustion |
FR2658505A1 (fr) * | 1990-02-21 | 1991-08-23 | Poudres & Explosifs Ste Nale | Procede de fabrication de chargements propulsifs fragmentables resistant a la temperature, poudres constitutives et chargements ainsi obtenus. |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2436120A1 (fr) * | 1978-09-12 | 1980-04-11 | Basset Bretagne Loire | Dispositif et procede de fabrication d'elements en poudre agglomeree |
FR2518736B1 (fr) * | 1981-12-17 | 1986-09-26 | Poudres & Explosifs Ste Nale | Chargements mixtes pour munitions avec douille constitues de poudre propulsive agglomeree et de poudre propulsive en grains |
JPH07112537B2 (ja) * | 1987-11-27 | 1995-12-06 | ダイセル化学工業株式会社 | 発火または爆発性の高い物質の原料組成物の混合方法 |
DE3913603C1 (de) * | 1989-04-25 | 1990-03-29 | Wnc-Nitrochemie Gmbh, 8261 Aschau, De | |
US5251531A (en) * | 1989-04-25 | 1993-10-12 | Wnc-Nitrochemie Gmbh | Method and apparatus to prepare monobasic propellant charge powders with alcohol and ether as solvents |
US5174837A (en) * | 1990-02-21 | 1992-12-29 | Societe Nationale Des Poudres Et Explosifs | Temperature-resistant, fragmentable propellent charges |
US5489349A (en) * | 1995-04-06 | 1996-02-06 | Trw Inc. | Grains of gas generating material and process for forming the grains |
US6692655B1 (en) | 2000-03-10 | 2004-02-17 | Alliant Techsystems Inc. | Method of making multi-base propellants from pelletized nitrocellulose |
US6860208B2 (en) * | 2001-01-04 | 2005-03-01 | Trw Inc. | Nitrocellulose gas generating material for a vehicle occupant protection apparatus |
US7191709B2 (en) * | 2004-02-10 | 2007-03-20 | The United States Of America As Represented By The Secretary Of The Navy | Enhanced performance reactive composite projectiles |
US7383775B1 (en) | 2005-09-06 | 2008-06-10 | The United States Of America As Represented By The Secretary Of The Navy | Reactive munition in a three-dimensionally rigid state |
GB2440515B (en) | 2006-08-01 | 2011-06-15 | Dyson Technology Ltd | A filter assembly |
US11686151B2 (en) | 2020-12-31 | 2023-06-27 | Springs Window Fashions, Llc | Motorized shade and wand assembly |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3711343A (en) * | 1971-08-20 | 1973-01-16 | Us Army | Cellular nitrocellulose based composition and method of making |
US4023996A (en) * | 1973-08-09 | 1977-05-17 | Societe Nationale Des Poudres Et Explosifs | Moldable compositions comprising polyvinyl nitrate |
FR2374278A1 (fr) * | 1976-12-20 | 1978-07-13 | Poudres & Explosifs Ste Nale | Chargement unitaire de poudre agglomeree |
JPS5476813A (en) * | 1977-11-30 | 1979-06-19 | Nippon Oils & Fats Co Ltd | Small granular propellant and production thereof |
FR2411817A1 (fr) * | 1977-12-15 | 1979-07-13 | Poudres & Explosifs Ste Nale | Chargement unitaire fragmentable de poudre propulsive, contenant un liant au nitrate de polyvinyle |
-
1978
- 1978-09-21 FR FR7827118A patent/FR2436766A1/fr active Granted
-
1979
- 1979-08-28 IL IL58127A patent/IL58127A/xx unknown
- 1979-08-28 DE DE7979400590T patent/DE2960839D1/de not_active Expired
- 1979-08-28 EP EP79400590A patent/EP0010009B1/de not_active Expired
- 1979-09-05 US US06/072,583 patent/US4326901A/en not_active Expired - Lifetime
- 1979-09-17 CA CA000335797A patent/CA1156839A/en not_active Expired
- 1979-09-20 AU AU51011/79A patent/AU529754B2/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
Eléments de la technique relevés: néant. * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2576014A1 (fr) * | 1983-07-13 | 1986-07-18 | Bofors Ab | Procede de fabrication d'une poudre propulsive et substance inhibitrice de combustion |
FR2658505A1 (fr) * | 1990-02-21 | 1991-08-23 | Poudres & Explosifs Ste Nale | Procede de fabrication de chargements propulsifs fragmentables resistant a la temperature, poudres constitutives et chargements ainsi obtenus. |
EP0446085A1 (de) * | 1990-02-21 | 1991-09-11 | Societe Nationale Des Poudres Et Explosifs | Verfahren zur Herstellung temperaturbeständiger zerfallsfähiger Treibladungen, entsprechende Treibladungspulver sowie so hergestellte Treibladungen. |
Also Published As
Publication number | Publication date |
---|---|
AU529754B2 (en) | 1983-06-16 |
FR2436766B1 (de) | 1981-02-27 |
US4326901A (en) | 1982-04-27 |
CA1156839A (en) | 1983-11-15 |
IL58127A (en) | 1982-08-31 |
AU5101179A (en) | 1980-03-27 |
EP0010009B1 (de) | 1981-09-16 |
DE2960839D1 (en) | 1981-12-03 |
FR2436766A1 (fr) | 1980-04-18 |
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