RU2487107C1 - Method to desensitise double-base ball powder - Google Patents

Abstract

FIELD: blasting.

SUBSTANCE: method to desensitise double-base ball powder includes preparation of the first deterrent emulsion by mixing of the deterrent - α,ω-dimetacryl-(bis-triethyleneglycol) phthalate (MGF-9) in the amount of 4.0-7.0 wt % relative to 1 wt part of powder with water in presence of leather glue; preparation of the powder suspension in the reactor with the mixing device; introduction of the first deterrent emulsion at 78-80°C into the powder suspension and mixing of the powder for 55-60 minutes at 78-80°C. Then at the same temperature they introduce the second emulsion containing 3.0-6.0 wt % of MGF-9 relative to 1 wt part of powder and 0.5-0.6 wt % of benzoyl peroxide (BP) relative to 1 wt part of MGF-9, and mixed with powder for 60-65 minutes at 78-80°C.

EFFECT: stability of a desensitised area of ball powder.

1 tbl, 56 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 [1-3]. As a phlegmatizer, both individual components (for example, centralit 1, dibutyl phthalate, diphenylamine, dinitrotoluene 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 [4], is a method of phlegmatization of spherical dibasic gunpowder, including the preparation of a 1.5-3.5% aqueous phlegmatizing emulsion by stirring with water for 10-20 minutes in the presence of 0.20-0 25 wt.% Of glue in relation to 1 wt.h. gunpowder and 2.0-6.0 wt.% centralite 1 in relation to 1 wt.h. gunpowder or a mixture of 2.0-6.0 wt.% centralite 1 and 1.3-2.5 wt.% dinitrotoluene in relation to 1 wt.h. gunpowder, a suspension of gunpowder in a reactor with a mixing device at a ratio of 2.29-2.31 wt.h. water and 1 parts by weight gunpowder, heating the resulting phlegmatizing emulsion before introducing it into the gunpowder suspension to a temperature of 76-80 ° C, treating the gunpowder suspension with a phlegmatizing emulsion for 60-65 minutes at a temperature of 76-80 ° C and a ratio of 1 wt.h. gunpowder: 3.0-3.5 parts by weight water.

The disadvantage of the prototype is the instability of the phlegmatized zone in gunpowder with a high content of nitroglycerin (more than 18 wt.%) During storage or during testing at elevated temperatures (40-50 ° C) and, as a result, leading to a change in ballistic characteristics (speed, pressure ) above the permissible norms.

The objective of the invention is to ensure the stability of the phlegmatized zone by changing the type and method of entering the phlegmatizer.

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 a glue with respect to the total amount of water, preparing a suspension of gunpowder in a mixing reactor a device, introducing the obtained phlegmatizing emulsion into a powder suspension, treating the powder suspension with a phlegmatizing emulsion, with initially 4.0-7.0 wt.% α, ω-dimethacryl- (bis-triethylene glycol) phthalate (MGF-9) in relation to 1 wt.h. gunpowder in the form of a phlegmatizing emulsion is introduced at a temperature of 78-80 ° C and mixed with 1 wt.h. gunpowder for 55-60 minutes at a temperature of 78-80 ° C, then at the same temperature a second emulsion is introduced containing 3.0-6.0 wt.% MGF-9 with respect to 1 wt.h. gunpowder and 0.5-0.6 wt.% benzoyl peroxide (PB) in relation to 1 wt.h. MGF-9, mixed with 1 wt.h. gunpowder 60-65 minutes at a temperature of 78-80 ° C.

The feasibility of the invention and the technical result achieved is confirmed by examples of the specific production of phlegmatized gunpowder with a high content of nitroglycerin.

The process is as follows.

Water is poured into the reactor, the TFP is charged and heated with stirring to a temperature of 78-80 ° C, then a phlegmatizing emulsion containing 4-7 wt.% MGF-9 with respect to 1 wt.h. is introduced into the reactor at the same temperature. gunpowder and 0.2-0.3 wt.% surfactants (for example, glue) in relation to water. The powder suspension is stirred 55-60 minutes at a temperature of 78-80 ° C, then a phlegmatizing emulsion is introduced containing 3-6 wt.% MGF-9 with respect to 1 wt.h. gunpowder, 0.5-0.6 wt.% benzoyl peroxide in relation to 1 wt.h. MGF-9 and 0.2-0.3 wt.% Surfactant with respect to water, and the suspension is treated at the indicated temperature for 60-65 minutes.

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

The choice of MGF-9 having a structural formula

as a phlegmatizer of gunpowder with a high content of nitroglycerin is due to the presence of active centers in the = C = C = and = C = O acrylate group (tetrafunctionality). According to the data of [5] = C = C = bonds are most reactive to the formation of intramolecular polymer chains, and = C = O to the formation of hydrogen bonds with cellulose nitrate molecules. Such processes will lead to the formation of network structures. Thus, penetrating to a certain depth, the phlegmatizer is fixed there by chemical bonds, ensuring the stability of the phlegmatized zone.

The polymerization process is accelerated in the presence of radical type initiators, for example benzoyl peroxide. Studies have shown that the optimal input of this compound is 0.5-0.6 wt.% In relation to 1 wt.h. MGF-9. The introduction of 0.5-0.6 wt.% PB in MGF-9 by one or two orders of magnitude accelerates the polymerization of the oligomer at a temperature of 80 ° C. Therefore, the first input of the emulsion without the polymerization initiator allows the penetration of MGF-9 to the required depth. A further increase in the PB content (up to 1.0 wt.%) Does not accelerate the process, i.e. an extreme dependence of the degree of polymerization of MGF-9 on the initiator content is observed.

In examples 4-5, the phlegmatization of gunpowder was carried out according to parameters outside the boundary conditions. If the temperature drops below 78 ° C (example 4), a sufficient depth of the phlegmatized layer in the TFP granules is not provided to create the necessary combustion progressivity or it is required to significantly increase the phlegmatization time. At 90 ° C, polymerization during the phlegmatization process is not observed, it partially begins to occur during drying or thermostating of gunpowder at a lower temperature, which explains the slight changes in the depth of the phlegmatized zone (example 5). The least stable phlegmatization zone containing the monomer compound is centralit 1 (prototype), for which the changes in the process of temperature control are 37-53%.

Thus, the proposed method of phlegmatization allows to ensure the stability of the phlegmatized zone.

Table Technological modes of phlegmatization of spherical powder Name of indicator Indicator Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 The temperature of the phlegmatizing emulsion and the suspension of gunpowder, ° C 78 80 80 70 90 80 Emulsion dosage ratio 2 2 2 2 2 one Entering centralite 1, wt.% To 1 wt.h. gunpowder - - - - - 6.0 The first input of MGF-9, wt.% To 1 wt.h. gunpowder 4.0 6.0 7.0 4.0 8.0 - The second input MGF-9, wt.% To 1 wt.h. gunpowder 3.0 5,0 6.0 3.0 4.0 - Input benzoyl peroxide, wt.% To MGF-9 0.5 0.55 0.6 0.2 1,0 Mixing gunpowder with emulsion MGF-9, min 55 60 60 70 fifty Mixing gunpowder with emulsion MGF-9 + benzoyl peroxide, min 60 60 65 120 fifty - Mixing gunpowder with centralite emulsion 1, min - - 60 The depth of the phlegmatized layer, microns 123-125 142-149 160-162 110-112 170-173 36-38 The depth of the phlegmatized layer after 7 hours of incubation, N, microns: 30 ° C - - - - 45-46 40 ° C - - - - 51-52 50 ° C 123-125 142-149 160-162 115-117 175-176 57-58 ΔN,%: 40 ° C - - - 37 50 ° C 0 0 0 4.3 1.7 53 Note. 1. The content of nitroglycerin in non-phlegmatized gunpowder in all samples is identical and is 25.5% wt. 2. The study of the penetration depth of the phlegmatizer was carried out for the powder fraction of 1.0-1.6 mm with an average particle diameter of 1.52 mm.

Information sources

1. Spherical gunpowder / Yu.M. Mikhailov, N.M. Lyapin, V.F. Sopin, etc. // 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 for producing spherical pyroxylin powder for 5.6 mm sports rifle cartridge."

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

5. Berlin A.A., Kefeli T.Ya., Korolev G.V. Oligoester acrylates. - M .: Nauka, 1967 .-- 372 p.

Claims (1)

A method of phlegmatizing a spherical dibasic gunpowder, including preparing a phlegmatizing emulsion by stirring a phlegmatizer with 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 with a phlegmatizing emulsion of -7.0 wt.% Α, ω-dimethacryl- (bis-triethylene glycol) phthalate (MGF-9) with respect to 1 wt.h. gunpowder in the form of a phlegmatizing emulsion is introduced at a temperature of 78-80 ° C and mixed with 1 wt.h. gunpowder for 55-60 minutes at a temperature of 78-80 ° C, then at the same temperature a second emulsion is introduced containing 3.0-6.0 wt.% MGF-9 with respect to 1 wt.h. gunpowder and 0.5-0.6 wt.% benzoyl peroxide (PB) in relation to 1 wt.h. MGF-9, mixed with 1 wt.h. gunpowder 60-65 min at a temperature of 78-80 ° C.