RU2451651C2 - Spherical pyroxylin ring-ignition powder for 5,6 mm-sporting caliber cartridges - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production of spherical powders for sporting rifles. Proposed ring-ignition powder comprises nitrocellulose, diphenylamine, commercial carbon, graphite, ethyl acetate and moisture. Note here that nitrocellulose of pyroxylin fine-grained powders with expired guarantee storage life is used.

EFFECT: high velocity of bullet and reduced scatter.

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 - 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 5.6 mm sports rifle cartridge of ring ignition from fine-grained pyroxylin non-phlegmatized gunpowders with expired warranty periods of storage. 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 a spherical pyroxylin powder for 5.6 mm sporting rifle cartridge of ring ignition from nitrocellulose from pyroxylin non-phlegmatized fine-grained powders with an expired warranty period of storage.

The technical result is achieved by the fact that nitrocellulose from pyroxylin non-phlegmatized fine-grained gunpowder with the expired warranty period of storage of the VTM brand is used as the feedstock with the following ratios of components, wt.%:

- 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.

Diphenylamine in the composition of gunpowder is used as a stabilizer of chemical resistance. Using it 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 ethyl acetate (EA) in the composition of the TFP play 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 powder gases in the barrel of a 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.

Table 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 98.6 97.75 96.6 99.1 95.6 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 (carbon black) and graphite (ratio) 0.3 0.5 0.8 0.2 1,0 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 The amount of moisture in the powder,% 0.3 0.5 0.8 0.2 0.9 Ballistic characteristics: Mass of charge, g 0,078 0,079 0,078 0,076 0,090 The average speed of the bullet, m / s 323 320 321 310 280 The spread of the speed of the bullet, m / s 10 12 8 25 thirty The maximum average pressure of the powder gases, MPa 93.1 91.2 96.1 107.8 122.5 Maximum highest pressure of powder gases, MPa 101 97.1 one hundred 137.3 127.5 The difference between the highest and lowest values of the pressure of the powder gases, MPa 8.8 7.8 9.0 15.7 23.5 Note: According to specifications, the mass of the charge is 0.070 ... 0.090 g; bullet flight speed - 315 ... 325 m / s; the dispersion of the speed of the bullet - not more than 12 m / s; maximum pressure of the powder gases: average - not less than 88.23 MPa, the largest - not more than 117.64 MPa, the difference between the highest and lowest pressure of the powder gases - not more than 14.7 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 annular ignition, including nitrocellulose, diphenylamine, carbon black, graphite, ethyl acetate and moisture, characterized in that the powder contains nitrocellulose from pyroxylin fine-grained powders with the expired warranty period of storage at the following ratio for the following ratio: wt.%:
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