RU2437866C2 - Method for obtaining porous ball moisture-resistant powder for shot-gun cartridges to smooth-bore guns - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: method for obtaining ball powders for smooth-bore guns involves treatment of porous ball powder with sizes of powder elements of 0.4…0.7 mm and humidity of 4.0…8.0 wt % in rotating polishing barrel with fine graphite C-1 with particle sizes of 0.1…4.0 mcm in quantity of 0.15…0.30 wt % and water in quantity of 0.15…0.30 wt % in relation to powder during 50…60 minutes; after that, powder is dried to humidity of 0.8…1.2 wt % by means of known method.

EFFECT: increasing moisture resistance of porous ball powders used for loading of shot-gun hunting and sports cartridges to smooth-bore gun.

1 tbl, 5 ex

Description

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

The patents [1, 2] propose methods for producing TFP, which consist in the separate preparation of cellulose nitrate varnish in a solvent, an aqueous solution of an emulsifier and a water-soluble salt (for example, sodium sulfate, sodium chloride), mixing the varnish and an aqueous solution of an emulsifier, dispersion on spherical particles and distillation solvent rinsing and drying.

The disadvantage of these methods is the high bulk density of the resulting powders and, as a consequence, the high mass of the powder charge, which does not provide the required ballistic characteristics of the shot cartridge.

The closest technical solution (prototype) is a method of producing TFP for hunting weapons [3], including the preparation of powder varnish in an aqueous medium with stirring of cellulose nitrate (SC) and diphenylamine (DPA) with ethyl acetate (EA), adding bone glue to the varnish, dispersing powder varnish on spherical particles and the removal of EA by heating the mixture. As SC use pyroxylin No. 1 or pyroxylin No. 1 with process waste, which is stirred for 10 ... 15 minutes in 4 ... 5 parts by weight water per one part by weight pyroxylin No. 1 or pyroxylin No. 1 with process waste together with DPA in the amount of 0.6 ... 1.2 wt.% and carbon black in the amount of 0.3 ... 1.0 wt.%, coming in the form of an aqueous suspension with a concentration 20 ... 30 wt.%, And copper (II) -lead (II) phthalate oxide (PMS) in an amount of 0.5 ... 2.5 wt.% By weight of pyroxylin No. 1 and with 2.4 ... 2.6 wt. hours EA, and heating the mixture to remove EA lead to a temperature of 92 ... 94 ° C.

The disadvantage of this method is that the obtained powder has a high moisture absorption and during storage, the loaded cartridges change ballistic characteristics.

The aim of the invention is to increase the moisture resistance of porous TFPs used to equip shot-hunting and sporting cartridges for smooth-bore weapons.

The goal is achieved in that the porous TFP with the dimensions of the powder elements of 0.4 ... 0.7 mm and a moisture content of 4.0 ... 8.0 wt.% Is processed in a rotating polishing drum with an input of 0.15 ... 0.30 wt.% Finely divided graphite grade S-1 with particle sizes of 0.1 ... 4.0 microns and 0.15 ... 0.30 wt.% water in relation to the powder for 50 ... 60 minutes, after which the powder is dried to a moisture content of 0.8 ... 1.2 wt.% In a known manner.

Examples of the method for producing porous spherical moisture-resistant gunpowder for shotgun cartridges for smoothbore weapons within the boundary conditions (examples 1 ... 3), as well as beyond them (examples 4, 5) are shown in the table.

Example 1. 120 kg TFP with powder sizes of 0.4 ... 0.7 mm and a moisture content of 4.0 wt.%, 0.180 kg of finely dispersed graphite grade S-1 with particle sizes of 0.1 ... 4.0 μm are loaded into the polishing drum and 0.180 liters of water, stirring is carried out for 50 minutes. Then the powder is dried in a known manner to a moisture content of 0.8 wt.%. Technological modes, physico-chemical and ballistic characteristics of the TFP are shown in the table.

Example 2. 120 kg TFP with powder sizes of 0.4 ... 0.7 mm and a moisture content of 6.0 wt.%, 0.270 kg of finely dispersed graphite grade S-1 with particle sizes of 0.1 ... 4.0 microns are loaded into the polishing drum and 0.270 liters of water, stirring is carried out for 55 minutes. Then the powder is dried in a known manner to a moisture content of 1.0 wt.%. Technological modes, physico-chemical and ballistic characteristics of the TFP are shown in the table.

Example 3. In the polishing drum is loaded 120 kg of SPP with the dimensions of the powder elements of 0.4 ... 0.7 mm and a moisture content of 8.0 wt.%, 0.360 kg of fine graphite grade S-1 with particle sizes of 0.1 ... 4.0 microns and 0.360 liters of water, mixing is carried out for 60 minutes. Then the powder is dried in a known manner to a moisture content of 1.2 wt.%. Technological modes, physico-chemical and ballistic characteristics of the TFP are shown in the table.

The gunpowder of the method proposed by the authors (examples 1 ... 3) was subjected to physico-chemical and ballistic tests for compliance with the requirements of the current regulatory and technical documentation, according to which acceptance of sports and hunting gunpowders, in particular technical conditions (TU) for the spherical sports gunpowder Sunar SHS. The following characteristics were determined:

- chemical resistance (gauge test), mm Hg, according to TU no more than 60;

- the average flight speed of the fraction, m / s, according to TU not less than 340;

- the spread of the flight speed of the fraction, m / s, according to TU no more than 15;

- the average maximum pressure of the powder gases in the channel of the barrel of the weapon, MPa, according to TU no more than 61.8.

Ballistic tests of cartridges were carried out with humidified and moistened gunpowder. Humidification of gunpowder was carried out by holding it in an atmosphere with 80% relative humidity for 3 hours.

As can be seen from the table, the considered compositions according to the method proposed by the authors have values of certain characteristics within the normative values.

Technological modes, physico-chemical and ballistic characteristics of the TFP Name of indicator Project 1 Project 2 Project 3 Project 4 Ex.5 The amount of loaded powder, kg 120 120 120 120 120 The moisture content of the powder,% 4.0 6.0 8.0 2.0 10.0 The amount of loaded graphite, kg 0.180 0.270 0.360 0,100 0.400 Amount of the filled in water, l 0.180 0.270 0.360 0,100 0.400 Mixing time min fifty 55 60 40 70 The moisture content of the powder,% 0.8 1,0 1,2 0.6 1.4 Chemical resistance, mmHg thirty 35 thirty 32 thirty Ballistic charge characteristics in a 12-gauge sports cartridge with a shot mass of 24 g (before wetting) Mass of charge, g 1.45 1.43 1.42 1.40 1,50 The average flight speed of the fraction, m / s 342 345 346 342 320 The spread of the flight speed of the fraction, m / s 12 fifteen eleven eighteen twenty The average maximum pressure of the powder gases in the channel of the barrel of the weapon, MPa 58.8 59.8 60.3 68.6 56.8 Ballistic charge characteristics in a 12-gauge sports cartridge with a shot mass of 24 g (after wetting) The average flight speed of the fraction, m / s 341 345 344 341 321 The spread of the flight speed of the fraction, m / s fifteen eleven fourteen 26 24 The average maximum pressure of the powder gases in the barrel of the weapon, MPa 57.5 58.4 58.8 69.6 55.8

So, with a charge mass of 1.42 ... 1.45 g tests of cartridges with wet powder showed that the average flight speed of the fraction is 342 ... 346 m / s; the spread of the flight speed of the fraction is 11 ... 15 m / s; the average maximum pressure of the powder gases in the barrel of the weapon is 58.8 ... 60.3 MPa. In this case, the chemical resistance of the powders is in the range of 30 ... 35 mm Hg.

When testing cartridges with moistened powder of the proposed formulation, the ballistic characteristics remained practically unchanged and amounted, respectively: 341 ... 345 m / s; 11 ... 15 m / s; 57.5 ... 58.8 MPa.

Thus, the method proposed by the authors for producing spherical powder within the boundary conditions provides the required moisture resistance. Outside the boundary conditions (examples 4, 5), the obtained spherical powder does not meet the requirements for ballistic characteristics.

Literature

1. US patent No. 2931800, 1960, CL. 260-223, MKI C08B 1/04.

2. German patent No. 1067719, 1960, NKI 78 C 20, MKI C06V.

3. RF patent No. 1727375 (С06В 21/00).

Claims (1)

A method of obtaining a porous spherical moisture-resistant powder for shotgun cartridges for smoothbore weapons, including mixing the components, preparing powder varnish in ethyl acetate, dispersing in the presence of glue, distilling off ethyl acetate and drying, characterized in that the porous spherical powder with the dimensions of the powder elements is 0.4 ... 0, 7 mm and a moisture content of 4.0 ... 8.0 wt.% Are treated in a rotating polishing drum with an input of 0.15 ... 0.30 wt.% Finely dispersed graphite grade S-1 with particle sizes of 0.1 ... 4.0 microns and 0 , 15 ... 0.30 wt.% Water in relation gunpowder for 50 ... 60 min, after which the lead powder drying to a moisture content of 0.8 ... 1.2 wt.%.