RU2549859C1 - Method of phlegmatizing of double-base spherical powder - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: method of phlegmatizing comprises preparing a 1.5-3.5% aqueous phlegmatizing emulsion by stirring with water of the phlegmatizer in the presence of hide glue, making the suspension of powder in a reactor with a stirrer, adding the resulting phlegmatizing emulsion into the powder suspension, treatment the suspension of powder with the phlegmatizing emulsion. The powder comprises 20-38 wt % nitro-glycerine. The powder is treated by single input of the emulsion containing 1.0-2.0 wt % hide glue in relation to water at a temperature of 70-90°C for 60-120 min. The phlegmatiser is used as the mixture of dinitrotoluol-α,ω-dimetacryl-(bis- triethylene glycol)phthalate(MGF-9) or centralite 1-MGF-9 in the ration of (20-40):(80-60).

EFFECT: wider parameters of varying depth of the phlegmatized zone while maintaining stability in the double-base spherical powders with high content of nitro-glycerine.

1 tbl, 6 ex

Description

The invention relates to the field of production of powders, in particular phlegmatization of spherical dibasic powders (TFP) with a high content of plasticizer.

Known methods of phlegmatization of TFP according to the water-emulsion technology, according to which the processing of a suspension of gunpowder with an aqueous emulsion of a phlegmatizer is carried out in the temperature range of 76-98 ° C and the exposure time of 25-120 minutes depending on the type of gunpowder [1-4]. As a phlegmatizer, both individual components (for example, centralit 1, dibutyl phthalate, diphenylamine, dinitrotoluene (DNT) with a melting point of not more than 90 ° C), and mixtures thereof are used. A disadvantage of the known methods is the instability of the ballistic characteristics of the propellant charge from phlegmatized gunpowder with a high content of nitroglycerin.

The closest adopted for the prototype of the present invention [5] is a method of phlegmatization of coarse dibasic spherical powder, including the preparation of 1.5-3.5% aqueous phlegmatizing emulsion, the preparation of a suspension of gunpowder in a reactor with a mixing device, the introduction of the obtained phlegmatizing emulsion into a suspension of gunpowder, processing a suspension of gunpowder with a phlegmatizing emulsion, characterized in that 6.5-7.5 wt.% phlegmatizer in relation to 1 wt.h. gunpowder in the form of a phlegmatizing emulsion is administered in two doses at a temperature of 90-95 ° C: the first portion of the emulsion containing 3.25-3.75 wt.% centralite 1 (C1) is mixed with 1 wt.h. gunpowder 60-90 min at a temperature of 90-95 ° C, the second portion of the emulsion containing 3.25-3.75 wt.% centralite 1 and centralite 11 in a ratio of 3: 1, mixed with 1 wt.h. gunpowder 120-150 min at a temperature of 90-95 ° C.

The well-known phlegmatization modes are designed for dibasic TFPs with an NGC content of up to 15-18 wt.%. The disadvantage of the prototype is a narrow range of variation in the depth of the phlegmatized zone in powders with a high content of nitroglycerin (more than 20 wt.%) While ensuring its stability under storage conditions in the temperature range (40-50 ° C).

The objective of the invention is to provide wider parameters for varying the depth of the phlegmatized zone while maintaining stability in dibasic TFP with an NGC content of more than 20 wt.% (Due to changes in the type of phlegmatizer and process temperature).

The problem is solved due to the fact that the method of phlegmatization of spherical dibasic gunpowder, including the preparation of a 1.5-3.5% aqueous phlegmatizing emulsion by stirring with phlegmatizer water in the presence of fencing glue, the preparation of a suspension of gunpowder in a reactor with a mixing device, the introduction of the obtained phlegmatizing emulsion in a suspension of gunpowder, the treatment of the suspension of gunpowder with a phlegmatizing emulsion is characterized in that the processing of gunpowder with 20-38 wt.% NGC is carried out by a single injection of an emulsion containing 1.0-2.0 wt.% mes glue with water, at a temperature of 70-90 ° C for 60-120 minutes, and a mixture of DNT-α, ω-dimethacryl- (bis-triethylene glycol) phthalate (MGF-9) or centralit 1- is used as a phlegmatizer MGF-9 in the ratio (20-40) :( 80:60).

The practical feasibility of the invention and the technical result achieved are confirmed by examples of specific production of phlegmatized gunpowders.

The process was carried out as follows. 3.0-3.5 parts by weight of water are poured into the reactor. in relation to 1 wt.h. gunpowder, load TFP and heated with stirring to a temperature of 70-90 ° C. Then, a 3.5% phlegmatizing emulsion obtained with stirring for 10–20 minutes and containing 1.0–2.0 wt.% Glue, with respect to water and a centralite mixture, is introduced into the reactor in one step at the same temperature. 1 and MGF-9 or DNT-MGF-9 in the ratio (20-40) :( 80-60). The powder suspension is stirred for 60-120 minutes.

The technological parameters of emulsion phlegmatization of TFP, the results of physico-chemical tests of samples of gunpowder are presented in the table.

According to the above data, the phlegmatization of gunpowder according to the stated modes ensures the achievement of a positive effect: the stability of the phlegmatized zone (examples 1-3). In examples 4-6, the phlegmatization of gunpowder was carried out according to parameters outside the boundary conditions.

It should be noted that the phlegmatization temperature of less than 80 ° C is acceptable only for the DNT-MGF-9 compositions, since the melting temperature of centralite 1 is ≈76 ° C. Lowering the temperature to less than 70 ° C leads to a shallow depth of the phlegmatized zone over a specified period of time due to the low diffusion rate of the components (example 4).

An increase in temperature of more than 90 ° C in highly plasticized formulations (30-37 wt.% NGC) leads to very rapid penetration of the phlegmatizer (Example 5), and small deviations from the required process parameters can lead to significant variations in the depth of the phlegmatized zone.

The use of 1.0-2.0 wt.% Of glue glue in relation to water allows a single injection of a phlegmatizing emulsion, regardless of the total dosage of the phlegmatizer, since it provides coagulation stability of the dispersed system regardless of the content of plasticizer. An increase in the content of glue of glue over 2.0 wt.% With respect to water is not economically feasible (taking into account the subsequent purification of process water from this component), since the necessary effect has already been achieved.

Phlegmatization time, along with temperature, determines the depth of the phlegmatized zone, which is formed by the requirements of the shooting system. The maximum time equal to 120 minutes allows you to complete the diffusion and taking into account the influence of the concentration factor on its speed. Further, the kinetic profile of the curve H = F (τ) reaches a plateau.

Gunpowder made according to the phlegmatization modes of the prototype, even with a total process duration of 120 minutes, provides a smaller depth of the phlegmatized zone as a result of the polymerization of MGF-9 with the formation of inactive mesh structures (example 6).

Thus, the proposed method provides a wider range of changes in the depth of the phlegmatized zone by varying the ratio of the components of the binary phlegmatizer and the process temperature while maintaining the stability of the physico-chemical characteristics, and hence subsequently the ballistic characteristics of the powder.

Information sources

1. Spherical gunpowder / Yu.M. Mikhailov, N.M. Lyapin, V.F. Sopin et al. // Chernogolovka: IPCP RAS, 2003 .-- 204 p.

2. RF patent №2244699, IPC С06В 21/00, 25/18, 25/28. A method of phlegmatization of gunpowder.

3. RF patent No. 1808190, IPC С06В 21/00. A method of obtaining a spherical pyroxylin powder for 5.6 mm sports rifle cartridge.

4. RF patent No. 2367639, IPC С06В 21/00. Method of phlegmatization of spherical dibasic gunpowder.

5. RF patent No. 2439043, PMK С06В 21/00. The method of phlegmatization of coarse dibasic spherical powder.

Claims (1)

The method of phlegmatization of spherical dibasic gunpowder, including the preparation of a 1.5-3.5% aqueous phlegmatizing emulsion by stirring with a phlegmatizer in water in the presence of coarse glue, preparing a suspension of gunpowder in a reactor with a stirring device, introducing the obtained phlegmatizing emulsion into a gunpowder suspension, treating the gunpowder suspension phlegmatizing emulsion, characterized in that the processing of gunpowder with 20-38 wt.% nitroglycerin is carried out by a single injection of an emulsion containing 1.0-2.0 wt.% of glue based on water, at a temperature of 70-90 ° C for 60-120 minutes, and a mixture of dinitrotoluene-α, ω-dimethacryl- (bis-triethylene glycol) phthalate (MGF-9) or centralit 1-MGF-9 is used as a phlegmatizer in the ratio (20-40) :( 80:60).