RU2719843C1 - Spherical powder for cartridges of small arms - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to production of spherical powders based on cellulose nitrates, particularly use of cellulose nitrates with high specific surface to obtain spherical powder to 5.6-mm rimless cartridges. Result is achieved by using crushed cellulose nitrate – pyroxylin 1Pl with high specific surface area and specific heat of combustion, as well as introduction of less toxic than diphenylamine, a chemical resistance stabilizer – diphenylol propane or agidol-1.

EFFECT: invention is aimed at increasing homogeneity of ballistic characteristics of spherical powders and, consequently, efficiency of firing.

1 cl, 1 tbl

Description

Known SFP brand SPSN 900 / 4,40 for equipment 5.6 mm rifle cartridges of annular ignition [1] (analogue), including the following components, wt. %:

Pyroxylin 1Pl containing nitric oxide no less than 210.0 ml / g 80.4-84.5 nitroglycerine 12.0-14.0 Central II 0.1-1.1 diphenylamine (DPA) 0.5-1.5 ethyl acetate (EA) 0.5-1.5 moisture 0.2-0.8 bonded graphite 0.1-0.5

As a disadvantage, the analogue has relatively large values of the dispersion of velocities and the maximum pressure of the powder gases in the barrel of the weapon in a group of 10 shots (inhomogeneity of ballistic characteristics) with a simultaneously large value of the mass of the propellant charge (0.10-0.12 g). The latter is caused, burning degressively, by the shape of the powder elements - spherical; the diameter of the powder elements is 0.2-0.4 mm

The closest is the single-base TFP [2] for the 5.6-mm sporting rifle cartridges, adopted as a prototype, including cellulose nitrate (SC) from pyroxylin fine-grained powders with an expired warranty period, DFA, carbon black, graphite, EA, at the following ratio of components, wt. %:

DFA 0.2-0.3 carbon black (soot) and graphite in the ratio by weight (2: 1) - (6: 1) 0.3-0.8 EA 0.6-1.5 moisture 0.3-0.8 Pyroxylin 1Pl containing nitric oxide 209-210.5 ml / g rest

Like the analogue of [1], the TFP prototype has a low level of uniformity of ballistic characteristics, which is due to the relatively low specific heat of combustion, due to the low content of nitric oxide in the NC.

The task of the invention is to increase the uniformity of the ballistic characteristics of the TFP and, accordingly, the effectiveness of shooting.

The technical result is achieved by the fact that the TFP for 5.6 mm rifle cartridges of annular ignition, including NC, graphite, EA, is characterized in that it contains NC-pyroxylin 1Pl with a nitric oxide content of at least 212.0 ml / g with a specific surface of 1000 -7000 cm / g in the following ratio of components, wt. %:

diphenylolpropane (DPP) or 2,6-di-tert-butyl-4-methylphenol (agidol-1) 0.2-1.0 EA  - 0.2-1.0 moisture  - 0.2-0.8 bonded graphite 0.1-0.3 Pyroxylin 1Pl with a content of nitric oxide of at least 212.0 ml / g and a specific surface area of 1000-7000 cm ² / g rest

The proposed technical solution provides for the use of crushed SC with increased specific surface area and specific heat of combustion. In addition, less toxic than DPA, a chemical stability stabilizer, DPP or Agidol-1, which belongs to hazard classes 3 and 4 according to GOST 12.1.007, respectively, was introduced into the powder.

Another aspect of the invention consists in the use of pyroxylin powder with an increased specific surface, which is formed in the production of SC after traps, as an SC base. Currently, such pyroxylin is not captured and sent to sedimentation tanks or, in other words, to ponds, having a negative impact on the environment. The proposed technical solution shows the ability to recycle "waste" in high quality gunpowder.

The results of ballistic tests in the composition of 5.6-mm rifle cartridges for annular ignition of TFP samples made using SCs with an increased specific surface area and specific heat of combustion indicate an increase in the uniformity of the ballistic characteristics of gunpowder. The latter is due to the achievement of smaller pores, their uniform distribution in the powder granules, and effective combustion (the indicator is a small charge mass).

Ballistic characteristics of the TFP according to the invention and its corresponding physicochemical parameters are shown in the table.

According to the table, thanks to the use of SC with the proposed characteristics, a high uniformity of the ballistic characteristics of the TFP is ensured - the values of the velocity dispersion of bullets in a group of 10 shots do not exceed 7-8 m / s, which increases the accuracy of shooting.

The obtained results of ballistic tests of gunpowder samples, coupled with the achievement of positive results in the ecology of SC production, are evidence of the positive effect of the invention.

Sources of information

1. OST 84-876. Spherical gunpowder for cartridges of annular ignition of caliber 5.6 mm.

2. Patent No. 2451651 of the Russian Federation, IPC С06В 25/18. Spherical gunpowder for a 5.6 mm rifle rimfire cartridge.

Claims (2)

Spherical powder for 5.6 mm rifle cartridges of annular ignition, including cellulose nitrate, graphite, ethyl acetate, characterized in that the cellulose nitrate contains 1Pl pyroxylin with a nitric oxide content of at least 212.0 ml / g with a specific surface area of 1000-7000 cm ² / g in the following ratio of components, wt.%: diphenylolpropane or 2,6-di-tert-butyl- 4-methylphenol 0.2-1.0 ethyl acetate 0.2-1.0 moisture 0.2-0.8 bonded graphite 0.1-0.3 Pyroxylin 1Pl with a content of nitric oxide of at least 212.0 ml / g and a specific surface area of 1000-7000 cm ² / g rest