RU17714U1 - CHARGE OF BALLISTIC SOLID MISSILE FUEL - Google Patents

Abstract

The charge of ballistic rocket fuel, made in the form of a checker, armored over a certain surface with cellulose acetate-based material, characterized in that the charge additionally contains an intermediate combined undercoat deposited on the fuel before booking, consisting of two varnishes based on cellulose acetate and based on triphenylmethantriisocyanate.

Description

CHARGE OF BALLISTIC SOLID MISSILE FUEL

The utility model relates to the field of rocket technology, namely, to the design of the plug-in charge of ballistic solid rocket fuel, armored over certain surfaces, and can be used in the design, development and manufacture of rocket engines for various functional purposes.

The design of the embedded charges of ballistic solid fuel, armored on certain surfaces, are widely used in rocket technology and, in particular, for engines of active-reactive systems (ARS), anti-tank systems (ATGM) and others. The main distinguishing feature of such products is the extreme level of operational loads and, in particular, the wide temperature range of operation and combat use: minus 60 ° С ... 60 ° С, which intensifies the processes of mass transfer at the border and the fuel reservation of chemically unrelated components in the formulations

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fuel and reservation. A typical diagram of a fuel checker (charge), armored on the outer surface, is presented in the book of A. M. Vinnitsky “Solid propellant rocket engines, Engineering, Moscow, 1973, p. 293, Fig. 10.16.

The closest in technical essence is a rocket engine with a freely enclosed armored charge, presented in the book by Ya. M. Shapiro, G. Yu. Masing, N. E. Prudnikov “Fundamentals of designing solid-fuel rockets. Military Publishing House of Moscow Region, Moscow, 1968 p. 38, fig. 1.35, consisting of a nozzle, front and nozzle covers, an engine chamber, a freely enclosed armored charge and its fastening elements in an engine chamber, which is adopted as a prototype.

The main disadvantage of the presented engine designs with an embedded armored charge is that the armor coating is applied directly to the fuel.

From the practice of developing and manufacturing armored charges, it is known that during long-term storage and combat operation of the engine, the reliability of the charge as a whole decreases due to changes in the chemical and structural-mechanical properties of armored coatings and fuel occurring at the interface between fuel materials and armored coatings due to mass transfer processes .

For fuels with a high nitroglycerin content (up to 30% in the composition), nitroglycerin (NG) always migrates from the fuel to the armored coating (up to 12% of the total NG content), which worsens the properties of the armored coatings (strength and elastic modulus decrease, creep increases, and thermal protection significantly worsens) ability due to increased combustibility of thermal coating) and, in addition, reduces the adhesive strength of the armored coating to fuel (up to the occurrence of individual foci of exfoliation), and changes the properties of the fuel, primarily its ballistic some characteristics (due to a decrease in the burning rate due to the loss of nitroglycerin).

It should be noted that the processes (mutual diffusion of components, chemical interaction of materials, processes of decomposition of fuel and armored coatings, etc.) that occur in the contact area of armored coatings and fuel materials are complex and have not yet been fully studied.

To reduce the diffusion of nitroglycerin from ballistic fuel to the armored coating and to suppress the migration of components from the armored coating to the fuel (mainly plasticizers, hardeners, catalysts, etc.), the selection method is used, the material of the armored coating, which is not always economically justified due to the deterioration of manufacturability

manufacturing charges, reducing the operational characteristics of armor plating, etc.

The objective of the utility model is to create a charge of ballistic solid fuel, armored over a specific surface, in which the migration of nitroglycerin from fuel to the armored coating and components from the armored coating to fuel is completely eliminated and the required adhesion of the armored coating to the fuel is ensured.

The problem is solved due to the fact that the known charge of ballistic rocket fuel, made in the form of a checker, armored over a specific surface with cellulose-acetyl-based material, additionally contains an intermediate combined sub-layer “AC-4D + LK-1A, deposited on the fuel before reservation, consisting of two cellulose acetate-based varnishes (AC-4D varnish) and triphenylmethane triisocyanate based varnishes (LK-1A varnish - Leikonat glue). The content of components in varnishes AC-4D and LK-1 is presented in table. 1.

At the same time, AC-4D varnish is developed on the basis of cellulose acetate, which is chemically related to ballistic fuel cellulose nitrate, therefore AC-4D varnish is the first sublayer to fuel in the combined layer, which suppresses

migration processes. Second sub-layer based on triphenylmethane triisocyanate

(glue "Leykonat). in fact, it provides reliable fastening of the reservation and checkers of fuel.

The proposed charge design consists of ballistic fuel checkers, a combined (anti-migration and adhesive) sub-layer “AC-4D + LK-1A and armored coatings.

The anti-migration and adhesive sublayer is applied by successive dipping (or by other methods, for example, by spraying) into non-deficient varnishes AC-4D and LK-1A, which are widely used in domestic industry.

The charge surface was varnished before being armored by the following procedure: “AC-4D varnishing (not 2 hours) - drying; Зch — LK-1A varnishing (not 2 hours) — 1,5 h drying.

Drying was carried out at 20 ° C with forced-air and exhaust ventilation.

The test results for the adhesion strength of the armored coating to the fuel are given in table. 2.

According to the results of tests on the adhesion strength of armored coatings to fuel, it is obvious that the use of the combined sub-layer “AC-4D + LK-1A increases the adhesion strength by 30%.

The test for thermostability of charges with a combined sublayer in the temperature range of 60 ... 100 ° C confirmed the provision of the required warranty shelf life

The claimed charge operates as follows: during long-term storage of charges in a wide range of operating temperatures from minus 60 ° С to 60 ° С, the combined sub-layer AC-4D + LK-1A prevents the migration of nitroglycerin from fuel to armor plating and components of armor plating to fuel, which prevents a change in properties , as the ballistic fuel itself, and armor plating, which provides a warranty period for storing the charge (equipped engine) and eliminates the reduction in the level of bond strength of the armor plating with fuel.

Claims (1)

The charge of ballistic rocket fuel, made in the form of a checker, armored over a certain surface with cellulose acetate-based material, characterized in that the charge additionally contains an intermediate combined sublayer deposited on the fuel before booking, consisting of two varnishes based on cellulose acetate and based on triphenylmethantriisocyanate.