EP0021896B1 - Nouveau procédé de fabrication de poudres propulsives à base de nitrocellulose sans déshydratation préalable - Google Patents

Nouveau procédé de fabrication de poudres propulsives à base de nitrocellulose sans déshydratation préalable Download PDF

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Publication number
EP0021896B1
EP0021896B1 EP19800400768 EP80400768A EP0021896B1 EP 0021896 B1 EP0021896 B1 EP 0021896B1 EP 19800400768 EP19800400768 EP 19800400768 EP 80400768 A EP80400768 A EP 80400768A EP 0021896 B1 EP0021896 B1 EP 0021896B1
Authority
EP
European Patent Office
Prior art keywords
nitrocellulose
solvent
powder
weight
grains
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
Application number
EP19800400768
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0021896A2 (fr
EP0021896A3 (en
Inventor
Louis Leneveu
Jean-Louis Rolland
Didier Treneules
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.)
Societe Nationale des Poudres et Explosifs
Original Assignee
Societe Nationale des Poudres et Explosifs
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 Societe Nationale des Poudres et Explosifs filed Critical Societe Nationale des Poudres et Explosifs
Publication of EP0021896A2 publication Critical patent/EP0021896A2/fr
Publication of EP0021896A3 publication Critical patent/EP0021896A3/fr
Application granted granted Critical
Publication of EP0021896B1 publication Critical patent/EP0021896B1/fr
Expired legal-status Critical Current

Links

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
    • C06B21/0066—Shaping the mixture by granulation, e.g. flaking

Definitions

  • the present invention relates to the manufacture of propellant powders in grains based on nitrocellulose.
  • the propellant powders in grains based on nitrocellulose are generally obtained by gelatinization of the fibrous nitrocellulose and cutting into grain of the nitrocellulose thus gelatinized.
  • the gelatinization of the nitrocellulose is carried out by kneading the nitrocellulose fibers in the presence of suitable solvents and by extrusion of the paste thus formed.
  • the extruded dough is cut into grains and the solvents are removed, often by soaking in water and air drying the powder grains which are then subjected to various surface treatments intended to fix agents on the powder grain surface.
  • combustion moderators sino-called “smoothing” operation
  • graphite in order to prevent the accumulation of static electricity on the powder grain (so-called “graphitizing” operation).
  • nitrocellulose is a very sensitive and therefore dangerous body
  • this product is kept wet with water so as to avoid any risk of ignition during its conservation or transport. It should therefore be dehydrated before using it for the production of a propellant powder.
  • the dehydration of nitrocellulose is generally carried out by replacing the water with alcohol by means of a dehydrating press.
  • the object of the present invention is to provide a simple and inexpensive process for manufacturing fine propellant powders based on non-dehydrated nitrocellulose.
  • the starting point is aqueous nitrocellulose which is mixed in a kneader with a solvent.
  • the choice of solvent is essential for the production and only the solvents chosen from the group consisting of methyl ethyl ketone, ethyl acetate or their mixtures in all proportions make it possible to achieve the result targeted by the invention: namely, thanks to a calendering operation, perfect elimination of the water contained in the nitrocellulose as well as good gelatinization of the latter.
  • solvents usually used in the manufacture of powders such as acetone, methyl isobutyl ketone, ethyl alcohol or ethyl ether do not make it possible to achieve the result targeted by the invention.
  • the content of the solvents used is generally between 50 ° / o and 100% by weight relative to the weight of dry nitrocellulose and according to a preferred embodiment of the invention between 60 ° / o and 80%.
  • a stabilizer such as, for example, diphenylamine or 2-nitro-diphenylamine and preferably a plasticizer such as, for example, dinitro toluene or centralite, is preferably added.
  • the duration of the mixing is generally close to two and a half hours.
  • the dough thus obtained is then passed through a cold calender. During calendering the water contained in the dough is expelled and ensures by the same occasion me a cooling of the calender rollers; simultaneously, the passage between the rollers of the calender causes gelatinization of the nitrocellulose.
  • the strip leaving the calendering machine is then wrung in air at room temperature and cut into flakes using a conventional cutter for strip powders.
  • the powder grains thus obtained are soaked in hot water to remove the solvents and dried. They are then optionally smoothed so as to incorporate on their surface a combustion moderator such as camphor for example and finally they are graphitized.
  • a combustion moderator such as camphor for example
  • This example relates to the manufacture of propellant powder grains from wet nitrocellulose and ethyl acetate as a solvent.
  • the powder grains thus obtained are soaked in hot water at 80 ° C for 8 hours and then air dried. Finally, the grains are graphitized in a bezel using 2% by weight of graphite relative to the weight of the powder.
  • a propellant powder is thus obtained having a potential of 964 cal / g, an apparent density of 480 g / dm 3 , a weight content of residual solvent of 0.5 ° / o and a residual humidity of 1.20% by weight . In addition, there are 5000 grains per gram for this powder.
  • This powder was fired into a 12.65 caliber shotgun.
  • the cartridges contained 32 g of lead n. 6 and a felt pad.
  • the firing results were as follows:
  • the powder according to the invention gives entirely satisfactory ballistic performance. Furthermore, the Applicant has observed that this powder lights up very well, this is understandable in view of the high number of grains per gram of powder.
  • This example relates to the manufacture of propellant powder grains from wet nitrocellulose and ethyl acetate as a solvent.
  • a propellant powder is thus obtained having a potential of 972 cal / g, an apparent density of 524 g / dm ', a weight content of residual solvent of 1.0 ° / o and a residual humidity of 1.28% by weight .
  • This powder was fired in a 12.65 caliber shotgun.
  • the cartridges contained 32 g of lead n. 6 and a felt pad.
  • the firing results were as follows:
  • This example relates to the manufacture of propellant powder grains from nitrocellulose wet and a mixture of ethyl acetate, methyl ethyl ketone as solvent.
  • a propellant powder is obtained having a potential of 967 cal / g, an apparent density of 500 g / dm 3 , a weight content of residual solvent of 0.60% and a residual humidity of 1.32% by weight.
  • This example relates to the manufacture of propellant powder grains from wet nitrocellulose and a mixture of ethyl acetate, methyl ethyl ketone as solvent.
  • the duration of the mixing is 2 hours.
  • the dough is passed through a calendering machine, the rollers of which are spaced 0.08 mm apart.
  • the strip coming out of the calendering machine is cut into flakes of 1 mm sides after half an hour of spinning.
  • the powder grains are then soaked, dried and graphitized as described in Example 1.
  • This example relates to the manufacture of propellant powder grains from wet nitrocellulose and methyl ethyl ketone as solvent.
  • the duration of the mixing is two hours.
  • the dough is passed through a calendering machine, the rollers of which are spaced 0.08 mm apart.
  • the strip coming out of the calendering machine is cut into flakes with sides of 1 mm after half an hour of spinning at room temperature.
  • the powder grains are then soaked, dried and graphitized as described in Example 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Medicinal Preparation (AREA)
  • Paints Or Removers (AREA)
EP19800400768 1979-06-07 1980-05-30 Nouveau procédé de fabrication de poudres propulsives à base de nitrocellulose sans déshydratation préalable Expired EP0021896B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7914539 1979-06-07
FR7914539A FR2458523A1 (fr) 1979-06-07 1979-06-07 Nouveau procede de fabrication de poudres propulsives a base de nitrocellulose sans deshydratation prealable

Publications (3)

Publication Number Publication Date
EP0021896A2 EP0021896A2 (fr) 1981-01-07
EP0021896A3 EP0021896A3 (en) 1981-05-27
EP0021896B1 true EP0021896B1 (fr) 1982-12-01

Family

ID=9226307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800400768 Expired EP0021896B1 (fr) 1979-06-07 1980-05-30 Nouveau procédé de fabrication de poudres propulsives à base de nitrocellulose sans déshydratation préalable

Country Status (6)

Country Link
EP (1) EP0021896B1 (show.php)
DE (1) DE3061203D1 (show.php)
ES (1) ES492073A0 (show.php)
FR (1) FR2458523A1 (show.php)
IN (1) IN159891B (show.php)
YU (1) YU41928B (show.php)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2220934C2 (ru) * 2002-03-19 2004-01-10 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Способ изготовления зарядов для ракетных двигателей твердого топлива
RU2333189C1 (ru) * 2007-01-09 2008-09-10 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Способ изготовления заряда баллиститного твердого ракетного топлива
RU2434832C1 (ru) * 2010-05-26 2011-11-27 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Способ изготовления заряда баллиститного твердого ракетного топлива

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE560358A (show.php) *
FR1145114A (fr) * 1953-09-18 1957-10-22 France Etat Procédé pour la fabrication de poudres à la nitrocellulose
US3325571A (en) * 1966-01-25 1967-06-13 Hercules Inc Process for the manufacture of smokeless powder

Also Published As

Publication number Publication date
EP0021896A2 (fr) 1981-01-07
FR2458523A1 (fr) 1981-01-02
YU41928B (en) 1988-02-29
EP0021896A3 (en) 1981-05-27
ES8200319A1 (es) 1981-11-01
ES492073A0 (es) 1981-11-01
YU148380A (en) 1983-02-28
FR2458523B1 (show.php) 1982-10-01
DE3061203D1 (en) 1983-01-05
IN159891B (show.php) 1987-06-13

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