RU2456258C2 - PYROXYLIN PELLET POWDER FOR 5,6 mm SPORTS LONG RIFLE CARTRIDGE - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production of pellet powder for small arms, particularly for a 5.6 mm sports long rifle cartridge. The powder contains nitrocellulose, diphenylamine, dibutyl phthalate, technical carbon, graphite, ethyl acetate and moisture. The nitrocellulose material used is high-nitrogen pyroxylin from expired pyroxylin fine-grained non-phlegmatised powder.

EFFECT: invention provides high bullet speed (up to 410 m/s) with low velocity spread.

1 tbl, 5 ex

Description

The invention relates to the field of production of spherical powders (TFP) for small arms.

US patents [1, 2] propose methods for producing TFP for small arms, which include grinding fine-grained pyroxylin gunpowders (MZPP) 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 the inability to obtain TFP for 5.6 mm annular ignition cartridges.

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; nitrocellulose with a nitric oxide content of at least 213.0 ml NO / g - the rest.

The disadvantage of this TFP is that when using instead of pyroxylin 1 Pl as a raw material with nitric oxide content of at least 213.0 ml NO / g of fine-grained pyroxylin non-phlegmatized gunpowder with expired warranty storage periods, the ballistic characteristics of the powder do not meet the requirements of a 5.6 mm ring cartridge ignition.

The aim of the invention is to obtain the TFP for a 5.6 mm rifle sports cartridge rimfire from fine-grained pyroxylin non-phlegmatized gunpowder with expired warranty periods with increased bullet flight speed. It is known that in the manufacture of fine-grained pyroxylin powders, medium nitrogen and high nitrogen pyroxylin are used, while high nitrogen pyroxylin contains 209 ... 210.5 ml NO / g nitric oxide.

The objective of the invention is to obtain spherical pyroxylin powder for a 5.6 mm sports rifle cartridge of ring ignition from nitrocellulose, which contains pyroxylin from pyroxylin non-phlegmatized fine-grained powders with an expired warranty shelf life, ensuring a bullet flight speed of up to 410 m / s.

The technical result is achieved by the fact that nitrocellulose is used as a feedstock, which contains pyroxylin from pyroxylin non-phlegmatized fine-grained gunpowders with an expired warranty period of storage of VTM and dibutyl phthalate (DBP) grade in the following ratios of components, wt.%:

- dibutyl phthalate - 2.0 ... 4.0;

- diphenylamine - 0.2 ... 0.3;

- carbon black (soot) and graphite

in the ratio by weight (2: 1) ... (6: 1) - 0.3 ... 0.8;

- ethyl acetate - 0.6 ... 1.5;

- moisture - 0.3 ... 0.8;

- nitrocellulose containing

nitric oxide 209 ... 210.5 ml NO / g - the rest.

Dibutyl phthalate in an amount of 2.0 ... 4.0 wt.% In the composition of the TFP performs the role of a phlegmatizing additive that ensures the progressive combustion of powder elements. The use of DBP less than 2.0 wt.% Leads to a decrease in the mass of the powder charge and an increase in the pressure of the powder gases in the channel of the barrel of the weapon. In the case of input DBP more than 4.0 wt.% Increases the mass of the powder charge and decreases the speed of the bullet.

Diphenylamine in the composition of gunpowder is used as a stabilizer of chemical resistance. The use of DFA in an amount of less than 0.2 wt.% Leads to a decrease in the chemical resistance of the powder, and an increase of more than 0.3 wt.% Leads to a decrease in the specific heat of combustion.

Carbon black (soot) is used in the composition of gunpowder as a combustion catalyst, graphite is used to reduce electrification and improve flowability. In practice, only their total amount can be determined in the composition of gunpowder. Their use in an amount of less than 0.3 wt.% Reduces the burning rate of powder elements and impairs flowability. The latter circumstance reduces the accuracy of the dosage of gunpowder into the cartridge case on the equipment line. The increase in the total content of graphite and soot more than 0.8 wt.% Causes dusting of gunpowder when unloading in bags and dosing into the sleeve. Given the high heat-conducting properties of carbon black, its introduction into the composition of the powder contributes to an additional improvement in the electrical conductivity.

Moisture and EA in the composition of the TFP perform the role of technological additives. A decrease in moisture of less than 0.3 wt.% And EA of less than 0.6 wt.% Is associated with additional labor costs during the drying process, and an increase in moisture and EA of more than 0.8 and 1.5 wt.%, Respectively, increases the mass of the powder charge and increases the pressure of powder gases in the barrel of the weapon.

Nitrocellulose in the composition of the TFP plays the role of an energy and structural basis. A decrease in the content of nitric oxide of less than 209 ml of NO / g leads to an increase in the mass of the powder charge and, as a result, to an increase in the pressure of the powder gases in the barrel of the weapon. An increase in nitric oxide of more than 210.5 ml of NO / g improves the ballistic characteristics of the TFP, however, the upper limit of the content of nitric oxide in MPP with expired warranty periods is limited by its manufacture.

The table shows the characteristics of the developed composition of the TFP, performed within the boundary conditions (examples 1 ... 3) and outside the boundary conditions (examples 4, 5).

From the above results of the table it can be seen that according to the developed composition (examples 1 ... 3), the obtained TFP provides the required ballistic characteristics. Outside of the boundary conditions (examples 4, 5), all ballistic indicators exceed the requirements of the technical conditions for the TFP, designed to equip 5.6 mm sports rifle ring ignition cartridge

Thus, the SPP developed by the authors makes it possible to use finely grained, high-nitrogen, non-phlegmatized gunpowder with expired warranty periods of storage, providing higher bullet speeds with less speed dispersion.

Physico-chemical and ballistic characteristics of the manufactured samples of gunpowder Name of indicator Example (Ex. No. 1) Etc. Number 2 Etc. Number 3 Etc. Number 4 Etc. Number 5 Composition, wt%: Nitrocellulose 96.6 94.75 92.6 98.1 90.6 Dibutyl phthalate 2.0 3.0 4.0 1,0 5,0 Diphenylamine 0.2 0.25 0.3 0.1 0.4 Ethyl acetate 0.6 1,0 1,5 0.4 2.0 Carbon black (soot) and 0.3 0.5 0.8 0.2 1,0 graphite (ratio) 2: 1 5: 1 6: 1 1: 0.8 8: 1 Moisture 0.3 0.5 0.8 0.2 1,0 The content of nitric oxide in nitrocellulose, ml NO / g 209 210 210.5 208 210.5 Bulk density, kg / dm ³ 0.672 0.670 0.668 0.660 0.674 Chemical resistance, mmHg 22 22 22 22 22 Porosity,% 24 26 28 twenty 45 Ballistic characteristics Mass of charge, g 0.10 0.12 0.16 0.08 0.17 The average speed of the bullet, m / s 385 410 408 360 340 The spread of the speed of the bullet, m / s 12 16 8 24 38 The maximum average pressure of the powder gases, MPa 92.2 96.1 97.0 125.5 145.1 Maximum highest pressure of powder gases, MPa 120.6 123.5 115.7 145.1 147.1 The difference between the highest and lowest values of the pressure of the powder gases, MPa 18.6 17.6 18.8 35.3 23.5

Note. According to technical conditions, the charge mass is 0.10 ... 0.16 g; bullet flight speed 385 ... 405 m / s; the spread of the bullet’s flight speed is not more than 18 m / s; the maximum pressure of the powder gases: average - not less than 88.23 MPa, the largest - not more than 127.45 MPa, the difference between the highest and lowest pressure values of the powder gases - not more than 19.6 MPa.

Literature

1. US patent No. 2843584.

2. US Patent No. 3378545.

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

Claims (1)

Spherical pyroxylin powder for 5.6 mm rifle sporting rifle cartridge of ring ignition, including nitrocellulose, diphenylamine, carbon black, graphite, ethyl acetate and moisture, characterized in that it contains dibutyl phthalate, as nitrocellulose contains high-nitrogen pyroxylin fine-grained fine-grained pyroxylin storage at the following ratios of components, wt.%:
dibutyl phthalate 2.0-4.0 diphenylamine 0.2-0.3 carbon black (carbon black) and graphite in the ratio by weight (2: 1) - (6: 1) 0.3-0.8 ethyl acetate 0.6-1.5 moisture 0.3-0.8 nitrocellulose containing nitric oxide 209-210.5 ml NO / g rest