Rocket solid-propellant charge

FIELD: engines and pumps.

SUBSTANCE: invention relates to solid-propellant charges. Proposed charge comprises casing and propellant charge attached thereto by protective-attachment layer. The latter represents a calendered sheet material based on ethylene-propylene and comprising serpentine asbestos as filler, dioctyldecyl adipate as plastifier and n-dinitrosobenzene as adhesive additive. Note here that the surface of aforesaid layer, on boundary of contact with propellant charge, is subjected to modification by thermally-treated 4,4'-diphenyl methane diisocyanate in the amount of 5 to 20 g/m2.

EFFECT: reliable attachment of charge to engine housing that allows charge longer life.

1 dwg, 1 tbl

 

The invention relates to military technology, and in particular to rocket engines (RD) with charges of composite solid fuels, processreply with the case of RD using a protective fixing layer (PCL).

The object of the invention is processreply with the body of the rocket engine, the charge of mixed solid fuel intended for use in a wide range of temperatures (from minus 60 to 60°C).

One of the most complex issues of development of the RD is to provide a reliable fastening of the charge of solid fuel with the body of the rocket engine. The reliability of the bonding depends on the circuit protective fixing layer and method of bonding charge with the case, and applied materials.

Foreign and domestic practice widely used charges rocket solid fuel, comprising a housing rigidly bonded with him the fuel charge, protective fixing layer with the following scheme of mounting charges of solid fuel to the walls of the rocket engine: at the beginning of the inner surface of the housing is applied to heat the floor, and then this coating is applied to secure the layer, providing a secure fixing of the charge to the engine block in the curing process fuel patent (U.S. No. 4601862, CL SW 21/00, 1987, the Japan patent No. 49-25324, CL CD 1/04, 1975). These technical solutions is redustrial two-layer protective fastening composition: this heat-shielding coating (HRC), which lined the inner surface of the housing, and deposited on the surface HRC adhesion layer, used for fixing charge of rocket fuel to the walls of the engine block.

Performing PGD of two layers complicates the engine design and manufacturing technology of the charges of the solid rocket fuel, and increases the cost of production.

Common features offered by the authors of charge rocket solid fuels is the presence of charge housing, rigidly bonded with him fuel charge, protective fixing layer.

Significant technical and economic effect is achieved when performing protective and secure the cover of the same material, performing the functions of heat insulation coating and reinforcing layer. In this case, the coating material should have a high erosion resistance to the action of products of combustion of metallized solid fuel and a sufficiently high adhesiveness with respect to the material fuel.

The closest in technical essence to the claimed technical solution is to design a charge of solid rocket fuel under the patent of Russia №2216641, CL F02 9/32, 2002, adopted by the authors for the prototype. The charge includes a housing rigidly bonded with him the fuel charge. Bond charge with the case is protective and reinforcing layer representing sheet calandrinia material on the basis of ethylene-propylene-diene rubber. Increased erosion resistance of the material ZKS achieved by using as the polymer base triple of ethylene-propylene-diene copolymer (rubber, Sept), which does not contain in the main chain double bonds and has a high heat resistance, as well as the introduction of the special rubber fillers (chrysotile). Adhesive ability ZKS in relation to fuels, rubber-based SOPS-is achieved through the introduction of material ZKS bifunctional compounds n-dinitrosobenzene (n-DNB), which provides for the creation of additional chemical bonds between the material ZKS and fuel. The introduction of the ZKS plasticizer of dioctylsebacate (DOS) can largely suppress the migration of plasticizer from the fuel PGS, as well as to increase the elastic properties of the latter in the region of low temperatures.

Common features with the proposed design of the propellant charge is a case, a charge of solid rocket fuel, and the same scheme of mounting the fuel charge housings RD using a protective fixing layer, while performing the functions of a heat shield housing and the fastening structure.

However, due to the nature of the molding charges mixed solid rocket fuel, during curing which the pressure in the poison increases to 50-60 kgf/cm 2at the boundary of contact of the fuel with ZKS are pressed in a binder fuel, causing a decrease in the strength of the boundary layers of fuel and, consequently, the strength of the charge case. The decrease in bonding strength of the charge housing also contributes to the moisture absorbed by the material ZKS when seal failure in the Assembly process with formative snap. Negative impact on the durability of fastening of a charge with the case of the extraction of the binder and moisture at the contact interface ZKS fuel is particularly evident on the charges of highly filled fuels, characterized by a high sensitivity to moisture and technological factors. Ultimately, the reduction in strength of the charge with the body, caused by the negative influence of moisture and redistribution components of the fuel at the contact interface in the molding process of the charge can lead to shortening of the service suitability processreply with housing charges up to the loss of their health directly after manufacturing.

The objective of the proposed technical solution is to design a charge of propellant, which has a higher bonding strength with the motor housing and extended life.

The technical result is achieved due to the fact that the protective fixing layer, not only is the store a sheet calandrinia material based on etilenpropilendienovogo rubber entered into its composition filler of asbestos-chrysotile, adhesion additive n-dinitrosobenzene and the plasticizer dioctylsebacate, undergoes chemical modification of its surface before filling the fuel mass termoobrabotannom 4,4'-diphenylmethanediisocyanate (DFMGI) in an amount of 5-20 g/m2.

The invention consists in that the charge of solid rocket fuel, is shown in the drawing, consists of a metal casing (1), tightly bonded with him fuel charge (2), the protective fixing layer (3), the surface of which before filling the fuel mass is subjected to chemical modification termoobrabotannom 4,4'-diphenylmethanediisocyanate in the amount of 5-20 g/m2(4).

The choice of a number of aliphatic and aromatic diisocyanates, DFMGI due to his behavior on the surface of the rubber is liable to modification. This feature consists in the ability of DFMGI to form reactive aromatic structure associates associated with the surface of the rubber. The resulting associates slow down the processes of diffusion and evaporation from the surface and, thereby, contribute to a more profound and effective reaction of the isocyanate groups with the reactive groups of the surface layer of rubber. In addition, the selected diisocyanate has a low volatility and, consequently, has reduced toxicity what about the comparison with other modifications diisocyanates.

The technology of surface modification of PCL on the bodies does not lead to a significant complication and prolongation of the technological process of preparation of the buildings.

The table shows the values of strength of the adhesive connection ZKS-fuel depending on the number of DFMGI used for modification of PCL from ethylenepropylene rubber.

Consumption DFMGI, g/m2The strength of the adhesive connection ZKS-fuel separation at a temperature of 20°C, kg/cm2
The placeholderExample 1Example 2Example 3
010,4
511,1-
10-12,3
20--0,9

As can be seen from the data processing termoobrabotannom 4,4'-diphenylmethanediisocyanate (DFMGI) allows to increase the durability and reliability of fastening of a fuel with PGD compared to the prototype.

Thus, surface modification ZKS of ethylenepropylene rubber by treating it with a solution heat-treated, DFMGI allows you to create a border contact with fuel additional chemical bonds and thus to compensate for the decrease in strength of the adhesive seam ZKS-fuel, caused by the extraction of the binder on the border of the contact and the negative influence of moisture.

The positive effect is confirmed by testing of samples and model products, carried out in accordance with the invention in the laboratory of the FSUE "December".

Thus, the advantages of the inventive design of a charge of solid propellant surface modified PCL allow for its high reliability and extended service life.

A charge of solid propellant, comprising a housing and bonded with him the fuel charge through the protective fixing layer, representing sheet calandrinia material on the basis of ethylene-propylene-diene rubber containing chrysotile asbestos as a filler, dioctylsebacate in the quality of the ve plasticizer and n-dinitrobenzol as adhesive additives, characterized in that the surface of the protective fixing layer at the contact interface with the fuel charge is subjected to chemical modification termoobrabotannom 4,4'-diphenylmethanediisocyanate in the amount of 5-20 g/m2.



 

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