RU2581375C1 - Pyroxylin pellet powder for 5.6 mm sport hunting cartridge of circular ignition - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to spherical gunpowder for small arms. Pyroxylin pellet powder for 5.6 mm sport hunting cartridge of circular ignition contains as starting material pyroxylin with nitrogen oxide content 213.0-214.0 ml NO/g and up to 30 wt% recyclable non-process wastes from previous operations, diphenylamine, technical carbon, ethyl acetate and moisture. Powder elements with size of 0.2-0.4 mm and bulk density of 0.62-0.72 kg/dm³ are phlegmatised from surface with dibutyl phthalate at a depth of 10-20 mcm and graphitised from surface with graphite.

EFFECT: invention provides production of pellet powder for 5,6 mm sport hunting cartridge of circular ignition with bullet speed of 485-500 m/s without increase of pressure of powder gases in barrel and flame during firing.

1 cl, 1 tbl, 5 ex

Description

The invention relates to the field of production of spherical powders (TFP) for a sports and hunting cartridge of ring ignition.

In US patents [1, 2], methods for producing TFP for small arms are presented, which include grinding fine-grained pyroxylin gunpowders (MFP) in an aqueous medium, followed by dissolving in a solvent, dispersing the powder varnish onto spherical particles and distilling off the solvent from them.

The disadvantage of these methods is that it is impossible to obtain the TFP for the 5.6 mm sport-hunting cartridge of ring ignition.

The closest technical solution is spherical pyroxylin powder for 5.6 mm sports rifle cartridge [3] - prototype, including, wt.%:

- dinitrotoluene (DNT) - 0.2-1.0;

- diphenylamine (DPA) - 0.4-0.8;

- carbon black and graphite in the ratio (2: 1) ... (6: 1) - 0.3-0.8 ethyl acetate (EA) - 0.3-0.9;

- moisture - 0.3-0.6;

- pyroxylin with a nitric oxide content of at least 213 ml NO / g - the rest.

The spherical powder given in the prototype for 5.6 mm of a sports and hunting end-ignition cartridge with a powder mass of 0.10-0.16 g provides a bullet speed of 385-405 m / s at a pressure of powder gases, MPa: average - at least 88, 2; the largest - no more than 127.5.

A further increase in the flight speed of the bullet is impossible due to an increase in the pressure of the powder gases in the bore, which is associated with rupture of the liners and the limited capacity of the spherical powder in the liner.

The aim of this invention is to obtain spherical powder, providing 5.6 mm sport-hunting cartridge for ring ignition bullet flight speed of 485-500 m / s without increasing the pressure of the powder gases in the barrel of the weapon and the flame when fired.

This goal is achieved by the fact that pyroxylin with a content of nitric oxide of 213.0-214.0 ml NO / g and up to 30 wt.% Of return-technological waste from previous operations, powder elements with a size of 0.2 are used as an energy and structural base. -0.4 mm and with a bulk density of 0.62-0.72 kg / dm ^{3 are} phlegmatized from the surface of 3.5-5.0 wt.% Dibutyl phthalate to a depth of 10-20 μm and graphitized from the surface with graphite 0.2-0 , 3 wt.%, In the following ratio of components, wt.%:

- diphenylamine - 0.4-0.8;

- dibutyl phthalate - 3.5-5.0;

- carbon black - 0.2-0.5;

- graphite - 0.2-0.3;

- ethyl acetate - 0.3-0.9;

- moisture - 0.1-0.7;

- pyroxylin with a nitric oxide content of 213.0-214.0 ml NO / g with return-technological waste from previous operations to 30 wt.% - the rest.

Pyroxylin with a nitric oxide content of 213.0-214.0 ml NO / g and recycling waste from previous operations in an amount of up to 30 wt.% In the composition of spherical gunpowder play the role of an energy and structural base. A decrease in nitroxide in pyroxylin of less than 213.0 ml NO / g leads to an increase in the mass of the powder charge and a decrease in the speed of the bullet, and an increase in the content of nitric oxide more than 214.0 ml NO / g leads to an increase in the pressure of the powder gases in the barrel of the weapon.

Powder elements with a size of 0.2-0.4 mm and a bulk density of 0.62-0.72 kg / dm ³ provide stable ballistic characteristics. A decrease in the powder elements less than 0.2 mm and a bulk density of less than 0.62 kg / dm ³ leads to a sharp increase in the pressure of the powder gases in the barrel of the weapon, and an increase in the size of the powder elements more than 0.4 mm and a bulk density of more than 0.72 kg / DM ³ leads to an increase in the mass of the powder charge and a decrease in the speed of the bullet due to incomplete combustion of the powder charge in the barrel of the weapon.

To increase the progressiveness of combustion, the powder elements are phlegmatized from the surface with dibutyl phthalate in an amount of 3.5-5.0 wt.% To a depth of 10-20 microns. Due to this, the pressure of the powder gases in the barrel of the weapon is reduced and the speed of the bullet is increased. A decrease in dibutyl phthalate of less than 3.5 wt.% And a depth of the phlegmatized layer of less than 10 μm leads to an increase in the pressure of powder gases in the channel of the barrel of the weapon, and an increase in dibutyl phthalate of more than 5.0 wt.% And a depth of the phlegmatized layer of more than 20 μm leads to an increase in the mass of the powder charge and lower bullet speed. Powder elements from the surface cover 0.2-0.3 wt.% Graphite to improve flowability and remove static electricity. A decrease in graphite of less than 0.2 wt.% Leads to a decrease in the flowability of the powder and the accumulation of static electricity on the surface of spherical particles. An increase in graphite of more than 0.3 wt.% Leads to dusting of graphite in the process of bags and equipment cartridges.

Carbon black in an amount of 0.2-0.5 wt.% In the composition of the powder plays the role of a combustion catalyst. A decrease in carbon black of less than 0.2 wt.% In the composition of spherical powder reduces the burning rate of powder elements, and an increase in carbon black of more than 0.5 wt.% Does not give a further effect on the burning rate of powder elements.

Diphenylamine in the composition of the TFP in the amount of 0.4-0.8 wt.% Is used as a stabilizer of chemical resistance. A decrease in DPA of less than 0.4 wt.% Leads to a decrease in the chemical resistance of the powder, and an increase in DPA of more than 0.8 wt.% Leads to a decrease in the energy of the powder itself.

Moisture and ethyl acetate in the composition of the TFP play the role of technological additives. A decrease in moisture of less than 0.1 wt.% And EA of less than 0.3 wt.% Leads to additional labor costs when drying the powder and distillation of the solvent from spherical elements, and an increase in moisture in the composition of gunpowder is more than 0.7 wt.% And ethyl acetate is more than 0, 9 wt.% Leads to an increase in the mass of the powder charge and a decrease in the flight speed of the bullet.

The table shows the characteristics of the developed composition of spherical gunpowder for 5.6 mm of a sport-hunting cartridge of ring ignition with a flight speed of a bullet 485 ... 500 m / s, performed within the boundary conditions (examples 1-3) and outside the boundary conditions (examples 4, 5).

Required ballistic characteristics: mass of the powder charge 0.14-0.18 g, average speed of the bullet 485-500 m / s, the difference between the highest and lowest values of the speed of the bullet is not more than 20 m / s, the pressure of the powder gases MPa: the greatest - no more than 161.8; the difference between the highest and lowest pressure values of the powder gases is not more than 19.6.

It can be seen from the table data that the composition of spherical powder developed by the authors for a 5.6 mm annular ignition cartridge with a bullet speed of 485-500 m / s within the boundary conditions (examples 1-3) satisfies all the requirements for ballistic characteristics. Outside of the boundary conditions (examples 4, 5), the obtained powder does not satisfy both the speed of the bullet and the pressure of the powder gases in the barrel of the weapon.

Literature

1. US patent No. 2843584.

2. US Patent No. 3378545.

3. RF patent No. 1808191 (С06В 25/22).

Claims (1)

Spherical pyroxylin gunpowder for 5.6 mm ring-shaped sports and hunting cartridge, including pyroxylin, diphenylamine, carbon black, graphite, ethyl acetate and moisture, characterized in that pyroxylin with a nitric oxide content of 213.0-214 is used as an energy and structural base , 0 ml NO / g and up to 30 wt.% Of return-technological waste from previous operations, powder elements with a size of 0.2-0.4 mm and a bulk density of 0.62-0.72 kg / dm ^{3 are} phlegmatized from the surface 3.5-5.0 wt.% Dibutyl phthalate to a depth of 10-20 microns and graphite from the surface of graphite 0.2-0.3 wt.%, in the following ratio of components, wt.%:
diphenylamine 0.4-0.8 dibutyl phthalate 3,5-5,0 carbon black 0.2-0.5 graphite 0.2-0.3 ethyl acetate 0.3-0.9 moisture 0.1-0.7 pyroxylin containing nitric oxide 213.0-214.0 ml NO / g with return-technological waste from previous operations up to 30 wt.% rest