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/m2||The strength of the adhesive connection ZKS-fuel separation at a temperature of 20°C, kg/cm2|
|The placeholder||Example 1||Example 2||Example 3|
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.
SUBSTANCE: invention relates to the field of rocket technology and can be used at for designing, developing and preparing solid rocket fuel charges for gas generators and rocket engines. The charge for solid rocket fuel is executed in the shape of a cylindrical cone cartridge with an end-to-end, axially symmetrical channel and partially covered with metal, external surfaces, furthermore, the butt end to the cartridge from the side of the cylindrical part is covered with metal. The cartridge is executed taking into account the correlations protected by the current invention. The charge, in its preferable form for execution, is made from ballistite rocket fuel, and the metal covering from material based on cellulose acetate.
EFFECT: invention increases operational efficacy and also reliability of the charge.
3 cl, 5 dwg
FIELD: blasting operations.
SUBSTANCE: brush-type propellant charge contains a stick of U-shaped powder elements. The charge has one end sunk in elastic adhesive material and is located in the cup of a propellant device. Each of powder elements is wrapped and tied in flexible material at its bending point so that each element has its bending point sunk in elastic adhesive material. Cotton thread is used as flexible material.
EFFECT: durable brush-type charges and simplified manufacturing process as operations that are hard to control visually are eliminated.
2 cl, 1 dwg
FIELD: rocket engineering.
SUBSTANCE: invention relates to rocket engineering and is designed to be used primarily in gas-generator and rocket engines charged with solid propellant rocket fuel. The proposed rocket solid propellant fuel charge for gas generator comprises a solid-propellant grain armored on side surface and front face and furnished with a blunt duct arranged on the side of rear burning face. Aforesaid blunt duct is shifted relative to the charge lengthwise axis and parallel to it, the said shift magnitude making 0.12 to 0.40 of the solid-propellant grain OD. The blunt duct sizes meet the ratios covered by this invention.
EFFECT: higher efficiency and reliability of proposed charge with improved output intraballistic characteristics.
3 cl, 4 dwg
FIELD: rocket engineering.
SUBSTANCE: invention relates to rocket engineering and can be used in designing, developing and producing solid-propellant rocket fuel for missile engines. The proposed charge represents a solid-propellant fuel grain with a central through channel and is partially armored on its side surface by alternating armoring lengthwise strips arranged along its outer side surface. Aforesaid armoring strips feature the length of 0.1 to 1.0 of the charge length and width making not over 0.2 of the charge burning end thickness. The total area of aforesaid armoring strips complies with the ratio covered by this invention. The said armoring strips are intermittent along the charge length with intermittency spacing of 1.0 to 2.0 mm and feature the armoring separated strip section weight of not over 1.5 g.
EFFECT: higher efficiency and safety of aircraft missile operation.
SUBSTANCE: proposed charge of solid rocket propellant is in form of a blasting cartridge, whose lateral surface is armour plated. The armour plate consists of a polymer binder and a reinforcement material with the following ratio of components, in wt. pts: polymer binder from 90 to 60, reinforcement material from 10 to 40. The invention proposes two versions of the binder. The reinforcement material is in form of low twist cotton yarn or cotton viscose or lavsan bands, which are wound on a rotating charge during the amour plating process. Solidification of the amour plate on the charge takes place at 15...40°C temperature for a period of 24-96 hours.
EFFECT: increased erosion resistance and thermal protective capacity of the armour plate, and increased rate of its polymerisation.
4 cl, 1 dwg, 4 tbl
FIELD: engines and pumps.
SUBSTANCE: invention relates to rocket engines and can be used in designing and producing solid-propellant rocket engines. Said engine incorporates housing with omniradial combustion charge arranged therein with gap and igniter fitted on charge front end face side. Charge features circular ledge arranged on charge rear end face edge in contact with housing inner surface. Circular ledge has through cuts made along charge generating line or at angle to it.
EFFECT: higher engine efficiency due to simpler design, better charge ignition and lower smoke formation.
FIELD: engines and pumps.
SUBSTANCE: solid-propellant launching rocket engine incorporates an annular combustion chamber with a nozzle unit, an igniter and multi-grain charge made up of all-round burning grains representing equal-diameter channel cylinders buried one into another, the grains axes being arranged on circular arc. The distance between the channel cylinder axes and circular arc diameter the said grain axes are located on, are defined by ratios protected by this invention. Cavities between the grains adjoining the outer and/or inner annular chamber outline accommodate additional small caliber grains. The said small-caliber grains are made in the form of channel and/or channelless cylinders of all-round burning, or in the form of channel cylinders armoured over the outer surface.
EFFECT: higher efficiency of launching engine thanks to optimum filling of its combustion chamber with fuel.
3 cl, 9 dwg, 1 tbl
SUBSTANCE: proposed solid-propellant booster engine contains annular combustion chamber with nozzle unit, igniter and multigrain charge. Charge is made up of all-round-burning grains in form of nested channel cylinders whose axes are arranged on arc of circumference. Longitudinal projections - zigs are made on periphery sections of grain profile adjoining outer and/or inner contours, width of projections does not exceed value of double thickness of charge burning dome. Distance between axes of channel cylinders and diameter of arc of circumference on which said axes are located is found from relation protected by proposed invention. Profiles of projections in cross section are either trapezoidal and/or triangular.
EFFECT: provision of stable coming of boost engine to operating conditions and reliability of its operation, increased total thrust impulse.
2 cl, 8 dwg
FIELD: the invention refers to rocket fuels.
SUBSTANCE: the charge of the solid rocket fuel on the basis of thin-vaulted fuel tubes of equal length with a section having a constant length is fulfilled component in the shape of two bundles of tubes. One of the bundle of the tubes is fulfilled with fuel tubes put on pins located on the front bottom of the engine in a vulcanized elastic resin. The other bundle, the central one, is placed relatively to the first bunch with displacement into the side of the front bottom of the engine into the central bucket fastened with the front bottom and is hold in it with a grate-bar. The central bundle is fulfilled with a diameter not going out of the limits of the space between the nozzles. The value of displacement of the central bundle is equal to the volume of the engine before the nozzles.
EFFECT: the invention ensures high initial speed of the shot, preserve the level of maximal pressure and expel digressively burning residues of fuel.
2 cl, 1 dwg
SUBSTANCE: invention can be used at designing, development and manufacture of solid-propellant charges. Proposed solid propellant charge for rocket engine is made in form grain of solid propellant with central through channel and partially restricted side outer surface. Restriction of side surface of grain is made in form of alternating longitudinal strips on side surface. Length of strips is 0.1 - 1.0 of charge length, and width does not exceed 0.2 of thickness of burning charge dome. Total area of restricting strips corresponds to relationship protected by said invention. Method of manufacture of solid-propellant charge for rocket engine comes to application of restriction coating on side outer surface of charge in form of alternating longitudinal strips. Said strips are formed by applying liquid viscous polymerizing restriction composition to side surface of charge grain using brush and template.
EFFECT: prevention of erosion peak pressure and provision of quick coming of rocket engine to working mode.
5 cl, 5 dwg
SUBSTANCE: rubber composition consists of, wt %: polypropylene - 3-21, butadiene-nitrile rubber - 22-55, olefin rubber - 2.5 -9.5, modificator, cross-linking agent for rubbers - 1.5-3.5, activator - 0.18-0.3, plasticiser - 3.0-7.5, mineral oil - 8-40. The composition contains polyisocyanate containing not less than two isocyanate groups (0.05-2.3 wt %) as a modificator and polypropylene with 1-6% of grafted maleic anhydride or maleic acid - 6-20 wt %. Plasticiser solubility parametre of is not less than 18 (kJ/m3)1/2.
EFFECT: oil resistance enhancing, decrease of relative residual elongation and melt flow index.
1 tbl, 9 ex
SUBSTANCE: invention relates to metallic-elastomeric compound for manufacturing of products. Compound includes elastomer, allowing molecular weight in the range approximately from 100000 g/mol. up to 300000 g/mol., metal-fibrous material, formed from variety of metallic fibers, each of which allows correlation of length to width, exceeding approximately 1 and binding agent. Metal-fibrous material is mixed with elasticity tester in amount in the range from 50 particles up to 150 parts on 100 particles of elastomer.
EFFECT: products of particular compound are described by additional strength, ability to heat passage, electrical conductance and flexibility.
8 cl, 8 tbl, 13 dwg
SUBSTANCE: polyethylene composition is intended for formation with blowing of barrels with 2 discharge holes with volume ranging from 50 to 250 dm3(l). Composition has density within the range from 0.950 to 0.956 g/cm3 at 23°C, value of index of melt flow rate MFR190/21.6 within the range from 1.5 to 3.5 dg/min and multimodal molecular-weight distribution. It includes from 35 to 45 wt % of homopolymer of ethylene A with low molecular weight, from 34 to 44 wt % of copolymer B with high molecular weight, representing copolymer of ethylene and 1-olefin, containing from 4 to 8 carbon atoms, and from 18 to 26 wt % of copolymer of ethylene C with superhigh molecular weight. Copolymer B contains less than 0.1 wt % of comonomer calculating on copolymer B weight, and copolymer C contains comonomers in amount from 0.1 to 0.6 wt % calculating on copolymer C weight.
EFFECT: polyethylene composition possesses increased impact viscosity and has high degree of blowing 180-220%.
9 cl, 1 ex, 1 tbl
FIELD: personal use articles.
SUBSTANCE: invention refers to rubber composition, to forming method of protective items made of this composition, to protective items of complex shape and to protective glove, made of rubber composition by press vulcanisation method. The composition is based on ethylene-propylene-diene caoutchouc mixture skept 40 and butyl rubber bk 1675 taken at equal rate. For fire-resistance qualities the composition contains antimony oxide mixed with chlorinated paraffin 470 and 1100.
EFFECT: produced goods have high mechanical qualities in combination with chemical and fire resistance to it to be used in extreme conditions influenced by aggressive environment, toxic chemical and propellant components.
5 cl, 2 tbl
SUBSTANCE: invention refers to making a moulded product for handling clean-room materials, intermediate products or end products, such as a container, a tray and a tool. The moulded product is made of resin compound prepared by mixing in melt cycloolefine polymer (A) 100 weight fractions chosen from the group including bicyclo[2.2.1]-2-heptene and its derivatives, tricyclo [4,3,0,12,5]-3-decene and its derivatives, and tetracyclo[4,4,0,12,5,17,10]-3-dodecene and its derivatives of vitrification temperature within 60 to 200°C, and amorphous or low-crystalline elastic copolymer (B(b1)) 1 to 150 weight fractions. Copolymer (B(b1)) is polymerised from at least two monomers chosen from the group including ethylene and a-olefin with 3 to 20 carbon atoms and vitrification temperature 0°C or lower. The compound contains radical polymerisation initiator 0.001 to 1 weight fractions containing peroxide, and polyfunctional compound (D) 0 to 1 weight fractions. The compound (D) has at least two radical-polymerised functional groups chosen from the group including vinyl group, allylic group, acrylic group and methacrylic group in a molecule.
EFFECT: clean-room moulded product is characterised with good chemical stability, heat resistance and dimensional accuracy, it prevents volatile component release in the surrounding space, has good abrasion resistance and prevents particle formation.
19 cl, 1 tbl, 2 dwg, 12 ex
SUBSTANCE: composition contains propylene polymer 60 to 85 % with wide chain-length distribution of polydispersity index 5 to 15 and melt flow rate speed 40 to 75 g/10 min, specified according to ASTM-D 1238, provision L, at 230°C under load 2.16 kg and partially xylene-soluble polyolefin rubber 15 to 40 % containing ethylene propylene copolymer containing at least ethylene 65 wt % and xylene-insoluble components approximately 25-40 wt % specified at 25°C. Polyolefin composition is characterised with good balance of mechanical properties, particularly improved balance of bending elastic modulus and impact strength even at low temperatures, e.g., at -30°C, and also low heat settings.
EFFECT: specified property ensures high dimensional stability to the products made of polyolefin composition according to the present invention.
5 cl, 2 tbl, 2 ex
SUBSTANCE: present invention relates to a polyethylene composition with multimodal molecular weight distribution, which is specially suitable for blow moulding large containers with volume ranging from 10 to 150 dm3 (l). The composition has density which ranges from 0.949 to 0.955 g/cm3 at 23°C and melt flow rate (MFR190/5) from 0.1 to 0,3 dg/min. The composition contains from 38 to 45 wt % homopolymer of ethylene A with low molecular weight, from 30-40 wt %, copolymer B with high molecular weight, obtained from ethylene and another 1-olefin, containing 4 to 8 carbon atoms, and from 18 to 26 wt % copolymer C with ultra-high molecular weight. The composition has Izod impact strength with notch (from ISO) from 30 to 60 kJ/m2 and resistance to bursting under stress (FNCT) from 60 to 110 hours.
EFFECT: large blow moulded objects made from the composition have high mechanical strength.
9 cl, 1 tbl, 1 ex
SUBSTANCE: thermoplastic elastomeric composition contains polypropylene, polyethylene, triple ethylene-propylene-diene copolymer, sulfur, primary and secondary vulcanisation accelerators, stearic acid and zinc oxide. Rubber crumb and bitumen are introduced into composition additionally. Combination of components in definite ratio improves rheological properties of composition and, correspondingly its processability.
EFFECT: high-strength products, of high ozone and atmosphere stability, resistance, can be practically fully utilised after expiry of product life.
5 cl, 2 tbl, 6 ex
SUBSTANCE: present invention pertains to a method of obtaining a resin composition. Description is given of the method of obtaining a resin composition through mixture in a molten mass of 100 weight parts of cyclic olefin polymer (A), whose glass transition temperature ranges from 60 and 200°C, and 1-150 weight parts of elastic polymer (B), with glass transition temperature 0°C or lower. Part of the cyclic olefin polymer (A) is first mixed in a molten mass with elastic polymer (B) and 0.001-1 weight parts of radical polymerisation initiator (C). The remaining cyclic olefin polymer (A) is then added and mixed in the molten mass. The ratio of the quantity of cyclic olefin polymer (A), initially added, to the quantity of the same polymer added later (initially added/added later) ranges from 1:99 to 70:30. Cyclic olefin polymer (A) is divided into two parts and added separately twice, such that, the mixture with a cross-linked structure can be diluted with cyclic olefin polymer (A), without a cross-linked structure. As a result, increase in the viscosity of the molten resin composition can be prevented.
EFFECT: good abrasion resistance and good moulding properties of the molten mass.
15 cl, 1 tbl, 4 ex
SUBSTANCE: invention concerns ethylene-alpha-olefin composition with improved damping properties, torque vibration damper, and device of chain, hose and vibration control unit, containing cured rubber composition. Cured rubber composition includes 100 parts of ethylene-alpha-olefin elastomer and majorly isobutylene or butene polymer with viscosity-average molecular weight of ca. 50000 to 1250000 and nonsaturation under 1 mol %. The polymer is present in amount effective for significant vibration damping property enhancement, with tan δ increase by at least 100%.
EFFECT: enhanced rubber vibration damping property.
9 cl, 4 dwg, 2 tbl, 1 ex
FIELD: road, industrial and civil building, in particular sealing and hydraulic insulating material.
SUBSTANCE: invention relates to industrial method for production of modified bitumen mastic. Claimed bitumen-polymer material contains (mass %) oil bitumen 60-70; synthetic resin 2-10; oil solvent and/or black oil 18-30; sulfur-containing compounds 0.5-5.0; and additionally oxyethylated alkylphenol as surfactant 0.1-5.0. Sulfated mixture of oil bitumen, synthetic resin, oil solvent and/or black oil treated for sulfitation at 140-2300C is used as sulfur-containing compounds. Method for production of said material also is disclosed.
EFFECT: polymer-modified bitumen mastic and sealing of improved quality; method for production of increased capability; inexpensive raw materials; energy-conversation technology.
6 cl, 3 ex, 4 tbl, 1 dwg