CN109942356B - Electric control solid propellant and preparation method thereof - Google Patents
Electric control solid propellant and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an electric control solid propellant and a preparation method thereof, belonging to the field of solid propellants. The electric control solid propellant comprises the following raw materials in percentage by mass: 10-14% of adhesive containing hydroxyl, 80-85% of main oxidant, 1-4% of secondary oxidant, 0.5-2% of cross-linking agent and 1-2.5% of functional auxiliary agent; the main oxidant is 5-10% of hydroxylamine nitrate water solution by mass concentration, and the cross-linking agent is one or a combination of a silicon-containing compound or an organic titanium chelate. The invention can avoid generating a large amount of gel clusters and bubbles in the drug slurry and obviously improve the uniformity of the electric control solid propellant.
Description
Technical Field
The invention belongs to the technical field of solid propellants, and relates to an electronic control solid propellant and a preparation method thereof.
Background
The solid rocket engine has the advantages of simple structure, quick response, convenient use and maintenance and the like, so the solid rocket engine is widely applied to strategic and tactical missile weapons. However, once the solid propellant is started, the solid propellant cannot be extinguished, so that the solid rocket engine cannot be started for multiple times, and the solid rocket engine does not have flexible energy management capability, thereby seriously restricting the wide application of the solid propellant technology. The liquid rocket engine has the characteristics of multiple starting, accurate thrust adjustment and the like, but the liquid rocket engine has a complex structure, most liquid propellant components have high toxicity, flammability and explosiveness, serious volatility and corrosivity, limited storage period, possible leakage in a use environment to cause catastrophic accidents, and great use risk. Meanwhile, the existing active solid strategy and part of tactical missiles mostly adopt a liquid-propelled terminal repair technology and a posture and orbit control technology, so that the missile launching preparation time is long, and the use and maintenance are complex, so that the missile weapons cannot meet the actual combat requirement of quick response.
The electronic control solid propellant can realize multiple ignition and flameout, so that the engine has the advantages of simple structure and accurate and controllable thrust, the maneuverability and flexibility of the solid engine are improved, the real-time regulation and control of the thrust of the solid engine are realized, and the missile weapon is accurately controlled. Once the electric control solid engine is successfully developed, the electric control solid engine can replace an active service strategy, a liquid attitude and orbit control engine for tactical missiles and a final repair engine, and the accurate hitting capability and the anti-interference capability of a missile weapon are improved; the propellant can also be used as a novel power source of a near space aircraft, and the flexible maneuvering gliding flight of the aircraft is realized by utilizing the controllable characteristic of the thrust.
Research efforts in electronically controlled solid propellants have been initiated and made with significant progress in the united states. In 2005, DSSP corporation published a solid electrically controlled propellant that, like conventional solid propellants, contained components such as a binder, an oxidizer, and a functional adjuvant, but that softened or melted upon combustion, thereby reducing its effectiveness and ability to misfire multiple times. On the basis, an improved electric control solid propellant is developed in the United states, electric control solid propellant engines with different sizes and weights are manufactured, and test runs of the electric control solid propellant engines are successfully carried out. In recent years, the U.S. DSSP company has developed a variety of electronically controlled solid propulsion systems that have been tested on a trial run with thrust forces of hundreds of pounds.
The existing preparation method of the electronic control solid propellant is to concentrate a primary oxidant hydroxylamine nitrate HAN solution to obtain a solution with the concentration of 80-90%, and then add secondary oxidants with different contents according to the formula requirements to form a liquid oxidant solution; then, in order to improve the stability of the high-concentration liquid oxidant, a proper amount of functional auxiliary agents such as a stabilizer and the like are required to be added into the liquid oxidant, and meanwhile, a cross-linking agent boric acid and the like are added, so that chemical cross-linking reaction can be generated between the adhesive components; because the usage amount of the high-concentration HAN liquid oxidant is difficult to effectively dissolve the adhesive components at room temperature, the adhesive PVA needs to be dissolved in pure water at high temperature, and then the PVA aqueous solution is added into the liquid oxidant mixed solution and mixed by stirring; and finally pouring the mixed slurry into a mould for curing and forming.
A large amount of gel clusters and bubbles exist in the drug slurry obtained by the existing formula, so that more pores exist in the finally formed drug column, the uniformity of the propellant is seriously influenced, and the actually measured density and the mechanical property of the propellant are greatly influenced, wherein the actually measured density is 1.46g/cm3About, far below theoretical calculation, room temperature tensile strength<1MPa, large fluctuation of test results and poor repeatability.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an electrically-controlled solid propellant and a preparation method thereof, wherein the propellant improves the uniformity of medicinal slurry, and the actually measured density can reach 1.54g/cm3The mechanical property is obviously improved, and the normal-temperature tensile strength can reach 1.58 MPa.
In order to achieve the above purpose, the invention provides the following technical scheme:
an electronic control solid propellant comprises the following raw materials in percentage by mass:
hydroxyl group-containing binder: 10% -14%;
a main oxidant: 80% -85%;
secondary oxidant: 1% -4%;
a crosslinking agent: 0.5 to 2 percent;
functional auxiliary agents: 1% -2.5%;
the main oxidant is hydroxylamine nitrate, the hydroxylamine nitrate is prepared into hydroxylamine nitrate water solution with mass concentration of 5-10% when the main oxidant is used, and the cross-linking agent is one or a combination of a silicon-containing compound or an organic titanium chelate.
In an optional embodiment, the silicon-containing compound is nano silicon dioxide, tetramethyl orthosilicate or tetraethyl orthosilicate, and the organic titanium chelate is TYZOR371 or HY-1803.
In an alternative embodiment, the hydroxyl-containing binder is at least one of polyvinyl alcohol, hydroxyethyl cellulose, or polyethylene oxide.
In an optional embodiment, the secondary oxidant is at least one of ammonium nitrate, sodium nitrate or potassium nitrate.
In an alternative embodiment, the functional additives include buffering stabilizers, chelating stabilizers, fuel additives, and thermal stabilizers.
In an alternative embodiment, the buffering stabilizer is ammonium dihydrogen phosphate; the chelating stabilizer is disodium ethylene diamine tetraacetate or 2, 2-bipyridyl; the fuel additive is cyclodextrin or sodium alginate; the heat stabilizer is 1,2, 4-triazole or pentaamino tetrazole.
In an optional embodiment, the electrically-controlled solid propellant comprises the following raw materials in percentage by mass:
adhesive: 12 to 14 percent;
hydroxylamine nitrate: 80% -85%;
secondary oxidant: 1.5-3%;
a crosslinking agent: 0.5-1.5%;
functional auxiliary agents: 1-1.5%;
wherein the cross-linking agent is prepared from nano silicon dioxide and TYZOR371 according to the mass ratio of 1: 0.5-1.
A preparation method of an electric control solid propellant comprises the following steps:
1) weighing the raw materials according to the formula;
2) adding the weighed adhesive, secondary oxidant, cross-linking agent and functional auxiliary agent into the hydroxylamine nitrate aqueous solution for complete dissolution to obtain uniform slurry;
3) concentrating and dewatering the slurry obtained in the step 2);
4) and pouring the concentrated slurry into a mold, freezing and solidifying to obtain the electrically-controlled solid propellant with good uniformity.
In an optional embodiment, in the step 2), the weighed adhesive, the secondary oxidant, the crosslinking agent and the functional assistant are added into the hydroxylamine nitrate aqueous solution, heated to 70-80 ℃, and stirred until the hydroxylamine nitrate aqueous solution is completely dissolved.
In an optional embodiment, in the step 3), the slurry obtained in the step 2) is cooled to 50-60 ℃, and is subjected to vacuum stirring to remove water.
In an alternative embodiment, the freeze-solidification of step 4) comprises: freezing at the low temperature of-20 to-45 ℃, then unfreezing at the normal temperature, and circulating for at least 2 times.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts a silicon-containing compound and/or an organic titanium chelate as a novel cross-linking agent of the electric control solid propellant, the cross-linking agent can carry out hydrolysis reaction in 5-10% hydroxylamine nitrate aqueous solution, hydroxyl on the surface of a hydrolysate and hydroxyl on adhesive molecules carry out dehydration reaction to form a chemical cross-linking structure, meanwhile, the hydrolysate can also form stronger hydrogen bond action with the hydroxyl on the adhesive molecular chain, the action strength between the hydroxyl and the hydroxyl on the adhesive molecular chain is weakened to a certain extent, the crystallization degree of a system is reduced, the system can be better dissolved, and as the main component in the hydroxylamine nitrate aqueous solution is water, the invention still has good stability in the high-temperature (70-80 ℃) dissolving process, the decomposition reaction can not occur, and all the components can be uniformly dispersed, thereby effectively preventing the generation of gel clusters, the uniformity and the fluidity of the medicine slurry are improved;
(2) according to the method, the key raw material HAN does not need to be concentrated in advance, and the HAN dilute solution can be prepared by adopting a conventional double decomposition reaction, so that the danger in the storage process of the high-concentration HAN solution is avoided;
(3) the invention can add the secondary oxidant, the adhesive, the cross-linking agent, the functional auxiliary agent and the like into the HAN dilute solution together for dissolving, thereby omitting the separate dissolving process in the original preparation method, reducing the preparation procedures and saving the preparation time;
(4) the method is carried out in the HAN dilute solution, so that all components of the propellant can be fully and uniformly mixed, gel clusters generated by overlarge local concentration of the slurry are avoided, the problem that bubbles are difficult to remove due to large viscosity of the slurry is also avoided, and the solid propellant with good uniformity is favorably obtained; the local over-concentration phenomenon cannot be caused by properly changing the formula proportion or changing the formula composition, so the method is suitable for various formula conditions and can be used for debugging and developing various formulas;
(5) the actual measured density of the electric control solid propellant provided by the embodiment of the invention can reach 1.54g/cm3The normal temperature tensile strength can reach 1.58MPa, and the safety performance meets the requirement of a danger level of 1.3.
Detailed Description
The invention is described in detail below with reference to specific embodiments, but the scope of protection of the invention is by no means limited to the following examples.
The embodiment of the invention provides an electronic control solid propellant, which is characterized in that: comprises the following raw materials in percentage by mass:
hydroxyl group-containing binder: 10% -14%;
a main oxidant: 80% -85%;
secondary oxidant: 1% -4%;
a crosslinking agent: 0.5 to 2 percent;
functional auxiliary agents: 1% -2.5%;
the main oxidant is hydroxylamine nitrate, the hydroxylamine nitrate is prepared into hydroxylamine nitrate water solution with mass concentration of 5-10% when the main oxidant is used, and the cross-linking agent is one or a combination of a silicon-containing compound or an organic titanium chelate.
Specifically, the silicon-containing compound is preferably nano-silica SiO2TMOS or TEOS, and the organic titanium chelate is TYZOR371 or HY-1803; the binder containing hydroxyl is preferably at least one of polyvinyl alcohol PVA, hydroxyethyl cellulose HEC or polyethylene oxide PEO; the secondary oxidant is at least one of ammonium nitrate AN, sodium nitrate NN and potassium nitrate KN; the functional auxiliary agent comprises a buffering stabilizer, a chelating stabilizer, a fuel additive and a heat stabilizer, wherein the buffering stabilizer is preferably ammonium dihydrogen phosphate, the chelating stabilizer is preferably disodium ethylene diamine tetraacetate or 2, 2-bipyridyl, and the fuel additive is preferably cyclodextrin or sodium alginate; the heat stabilizer is 1,2, 4-triazole or pentaamino tetrazole.
In a preferred embodiment, the electrically-controlled solid propellant comprises the following raw materials in percentage by mass:
adhesive: 12 to 14 percent;
hydroxylamine nitrate: 80% -85%;
secondary oxidant: 1.5-3%;
a crosslinking agent: 0.5-1.5%;
functional auxiliary agents: 1-1.5%;
wherein the cross-linking agent is prepared from nano silicon dioxide and TYZOR371 according to the mass ratio of 1: 0.5-1.
The embodiment of the invention also provides a preparation method of the electric control solid propellant, which comprises the following steps:
step 1): weighing the raw materials according to the formula provided by the raw material formula embodiment;
the description and the effects of the raw materials are detailed in the formula examples, and are not repeated herein; among them, it is preferable to mix hydroxylamine sulfate and barium nitrate in a mass ratio of 1: 1, carrying out double decomposition reaction at the temperature of 60-70 ℃ to prepare hydroxylamine nitrate aqueous solution with the mass concentration of 5-10%;
step 2): adding the weighed adhesive, secondary oxidant, cross-linking agent and functional auxiliary agent into the hydroxylamine nitrate aqueous solution for complete dissolution to obtain uniform slurry;
step 3): concentrating and dewatering the slurry obtained in the step 2);
step 4): and pouring the concentrated slurry into a mold, freezing and solidifying to obtain the electrically-controlled solid propellant with good uniformity.
Specifically, in the step 2), the weighed adhesive, the secondary oxidant, the crosslinking agent and the functional assistant are added into the hydroxylamine nitrate aqueous solution, heated to 70-80 ℃, and stirred until the mixture is completely dissolved. The method simplifies the mixing process and effectively shortens the reaction time.
Specifically, in the step 3), the slurry obtained in the step 2) is cooled to 50-60 ℃, and is subjected to vacuum stirring, concentration and water removal. The water content in the system is reduced, and simultaneously, the bubbles in the slurry are removed, and the energy performance of the propellant is improved.
Specifically, the freeze solidification in step 4) includes: freezing at the low temperature of-20 to-45 ℃, then unfreezing at the normal temperature, and circulating for at least 2 times. The method improves the crosslinking strength among adhesive systems by a physical crosslinking method of low-temperature freezing while chemically crosslinking.
The HAN aqueous solution used in each example of the present invention was prepared by mixing hydroxylamine sulfate and barium nitrate in a mass ratio of 1: 1 is prepared by double decomposition reaction at 65 ℃, and the rest raw materials are all commercial products.
Example 1
Weighing the raw materials according to the formula in the table 1;
adding the weighed adhesive polyvinyl alcohol, ammonium nitrate serving as a secondary oxidant, nano silicon dioxide serving as a cross-linking agent, ammonium dihydrogen phosphate serving as a buffering stabilizer, 2-bipyridine serving as a chelating stabilizer, cyclodextrin serving as a fuel additive and pentaamino tetrazole serving as a heat stabilizer into an HAN aqueous solution with the mass concentration of 5%, heating to 80 ℃, and stirring until the polyvinyl alcohol, the ammonium nitrate serving as a secondary oxidant and the nano silicon dioxide are completely dissolved; and (3) closing the heating device, cooling the solution to 50 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 94% of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 24 hours at the temperature of minus 40 ℃, unfreezing at normal temperature, and circulating for 3 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 1 example 1 raw material formulation table
| Formulation composition | Content/% wt |
| HAN | 81 |
| PVA | 13 |
| AN | 3 |
| SiO2 | 1 |
| Ammonium dihydrogen phosphate | 0.5 |
| 2, 2-bipyridine | 0.5 |
| Cyclodextrin | 0.5 |
| Five amino tetrazole | 0.5 |
Actually measured density of the propellant: 1.52g/cm3Normal temperature tensile strength: 1.47MPa, maximum elongation: 457.2 percent, and the safety performance meets the requirement of a danger level of 1.3.
Example 2
Weighing the raw materials according to the formula in the table 2;
adding the weighed adhesive polyvinyl alcohol, sodium nitrate serving as a secondary oxidant, tetraethyl orthosilicate serving as a cross-linking agent, ammonium dihydrogen phosphate serving as a buffering stabilizer, disodium ethylene diamine tetraacetate serving as a chelating stabilizer and pentaaminotetrazole serving as a heat stabilizer into a 5% HAN aqueous solution, heating to 80 ℃, and stirring until the materials are completely dissolved; and (3) closing the heating device, cooling the solution to 60 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 94% of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 15 hours at the temperature of-30 ℃, unfreezing at normal temperature, and circulating for 4 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 2 example 2 raw material formulation table
| Formulation composition | Content/% wt |
| HAN | 82 |
| PVA | 13 |
| NN | 2 |
| TEOS | 1.5 |
| Ammonium dihydrogen phosphate | 0.5 |
| Ethylenediaminetetraacetic acid disodium salt | 0.5 |
| Five amino tetrazole | 0.5 |
Actually measured density of the propellant: 1.53g/cm3Normal temperature tensile strength: 1.42MPa, maximum elongation: 443.3%, the safety performance meets the requirement of the danger level 1.3.
Example 3
Weighing the raw materials according to the formula in the table 3;
adding the weighed adhesive polyvinyl alcohol, ammonium nitrate serving as a secondary oxidant, TYZOR371 serving as a cross-linking agent, ammonium dihydrogen phosphate serving as a buffering stabilizer, 2-bipyridine serving as a chelating stabilizer, cyclodextrin serving as a fuel additive and 1,2, 4-triazole serving as a heat stabilizer into an HAN aqueous solution with the mass concentration of 8%, heating to 80 ℃, and stirring until the materials are completely dissolved; and (3) closing the heating device, cooling the solution to 55 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 90% of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 15 hours at the temperature of-40 ℃, unfreezing at normal temperature, and circulating for 4 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 3 example 3 raw materials formulation table
| Formulation composition | Content/% wt |
| HAN | 80 |
| PVA | 14 |
| AN | 2.5 |
| TYZOR371 | 1.5 |
| Ammonium dihydrogen phosphate | 0.5 |
| 2, 2-bipyridine | 0.5 |
| Cyclodextrin | 0.5 |
| 1,2, 4-triazoles | 0.5 |
Actually measured density of the propellant: 1.51g/cm3Normal temperature tensile strength: 1.35MPa, maximum elongation: 415.8%, the safety performance meets the requirement of the danger level 1.3.
Example 4
Weighing the raw materials according to the formula in the table 4;
adding the weighed adhesive polyvinyl alcohol and hydroxyethyl cellulose, a secondary oxidant ammonium nitrate, a cross-linking agent nano silicon dioxide, a buffering stabilizer ammonium dihydrogen phosphate, a chelating stabilizer 2, 2-bipyridine and a heat stabilizer 1,2, 4-triazole into an HAN aqueous solution with the mass concentration of 8%, heating to 75 ℃, and stirring until the polyvinyl alcohol and the hydroxyethyl cellulose are completely dissolved; and (3) closing the heating device, cooling the solution to 60 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 90% of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 24 hours at the temperature of-20 ℃, unfreezing at normal temperature, and circulating for 3 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 4 example 4 raw materials formulation table
Actually measured density of the propellant: 1.53g/cm3Normal temperature tensile strength: 1.21MPa, maximum elongation: 433.5%, the safety performance meets the requirement of the danger level 1.3.
Example 5
Weighing the raw materials according to the formula in the table 5;
adding weighed adhesive polyvinyl alcohol and polyoxyethylene, a secondary oxidant ammonium nitrate, a cross-linking agent tetramethyl orthosilicate, a buffering stabilizer ammonium dihydrogen phosphate, a chelating stabilizer disodium ethylene diamine tetraacetate and a heat stabilizer pentaamino tetrazole into a 10% HAN aqueous solution, heating to 75 ℃, and stirring until the mixture is completely dissolved; and (3) closing the heating device, cooling the solution to 50 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 88 percent of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 10 hours at the temperature of-30 ℃, unfreezing at normal temperature, and circulating for 3 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 5 example 5 raw materials formulation table
| Formulation composition | Content/% wt |
| HAN | 82 |
| PVA | 13 |
| PEO | 1 |
| AN | 2 |
| TMOS | 0.5 |
| Ammonium dihydrogen phosphate | 0.5 |
| Ethylenediaminetetraacetic acid disodium salt | 0.5 |
| Five amino tetrazole | 0.5 |
Actually measured density of the propellant: 1.53g/cm3Normal temperature tensile strength: 1.11MPa, maximum elongation: 399.3%, the safety performance meets the requirement of the danger level 1.3.
Example 6
Weighing the raw materials according to the formula in the table 6;
adding the weighed adhesive polyvinyl alcohol, a secondary oxidant sodium nitrate, a cross-linking agent HY-1803, a buffer stabilizer ammonium dihydrogen phosphate, a chelating stabilizer 2, 2-bipyridine, a fuel additive sodium alginate and a heat stabilizer pentaamino tetrazole into a 10% HAN dilute solution, heating to 80 ℃, and stirring until the materials are completely dissolved; and (3) closing the heating device, cooling the solution to 55 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 88 percent of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 15 hours at the temperature of-35 ℃, unfreezing at normal temperature, and circulating for 3 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 6 example 6 raw materials formulation table
| Formulation composition | Content/% wt |
| HAN | 83 |
| PVA | 12 |
| NN | 1 |
| HY-1803 | 1.5 |
| Ammonium dihydrogen phosphate | 0.5 |
| 2, 2-bipyridine | 0.5 |
| Sodium alginate | 1 |
| Five amino tetrazole | 0.5 |
Actually measured density of the propellant: 1.54g/cm3Normal temperature tensile strength: 1.27MPa, maximum elongation: 409.2 percent and the safety performance meets the requirement of 1.3 grade of danger level.
Example 7
Weighing the raw materials according to the formula in the table 7;
adding the weighed adhesive polyvinyl alcohol, a secondary oxidant sodium nitrate, a cross-linking agent HY-1803, a buffer stabilizer ammonium dihydrogen phosphate, a chelating stabilizer 2, 2-bipyridine, a fuel additive sodium alginate and a heat stabilizer pentaamino tetrazole into a 10% HAN dilute solution, heating to 80 ℃, and stirring until the materials are completely dissolved; and (3) closing the heating device, cooling the solution to 50 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 88 percent of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 12 hours at the temperature of-35 ℃, unfreezing at normal temperature, and circulating for 2 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 7 example 7 raw materials formulation table
| Formulation composition | Content/% wt |
| HAN | 85 |
| PVA | 11 |
| NN | 2 |
| HY-1803 | 0.5 |
| Ammonium dihydrogen phosphate | 0.25 |
| 2, 2-bipyridine | 0.5 |
| Sodium alginate | 0.5 |
| Five amino tetrazole | 0.25 |
Actually measured density of the propellant: 1.55g/cm3Normal temperature tensile strength: 1.22MPa, maximum elongation: 443.3%, the safety performance meets the requirement of the danger level 1.3.
Example 8
Weighing the raw materials according to the formula in the table 8;
weighing the adhesive polyvinyl alcohol, the secondary oxidant sodium nitrate and the cross-linking agent SiO2Adding the mixture and TYZOR371, buffer stabilizer ammonium dihydrogen phosphate, chelating stabilizer 2, 2-bipyridine, fuel additive cyclodextrin and heat stabilizer pentaamino tetrazole into a HAN dilute solution with the mass concentration of 10%, heating to 80 ℃, and stirring until the mixture is completely dissolved; and (3) closing the heating device, cooling the solution to 60 ℃, carrying out vacuum stirring to carry out concentration and dehydration until the water content in the receiving bottle accounts for 88 percent of the total mass of the HAN aqueous solution, and removing bubbles in the slurry by utilizing a vacuum environment. And pouring the concentrated slurry into a mold, freezing for 24 hours at-45 ℃, unfreezing at normal temperature, and circulating for 3 times to prepare the electrically-controlled solid propellant with good uniformity.
Table 8 example 8 raw materials formulation table
Actually measured density of the propellant: 1.55g/cm3Normal temperature tensile strength: 1.58MPa, maximum elongation: 459.6%, the safety performance meets the requirement of the danger level 1.3.
The electric control solid propellant prepared by the embodiments of the invention has good electric control characteristics, can generate ignition combustion reaction under the action of external voltage, and stops the combustion reaction after power failure.
The formula is only the specific implementation mode listed in the invention, and the electrically-controlled solid propellant with good uniformity can be obtained by adopting the preparation method provided by the invention. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the present invention.
Claims (1)
1. An electrically controlled solid propellant, characterized by: comprises the following raw materials in percentage by mass:
hydroxyl group-containing binder PVA: 13 percent;
primary oxidant hydroxylamine nitrate HAN: 81 percent;
secondary oxidant AN: 3 percent;
crosslinking agent SiO2：1％；
Buffering stabilizer ammonium dihydrogen phosphate: 0.5 percent;
0.5 percent of chelating stabilizer 2, 2-bipyridyl;
0.5 percent of fuel additive cyclodextrin;
0.5 percent of heat stabilizer pentaamino tetrazole;
when the main oxidant is used, firstly, preparing hydroxylamine nitrate HAN into hydroxylamine nitrate HAN water solution with the mass concentration of 5%;
the preparation method of the electric control solid propellant comprises the following steps:
1) weighing raw materials;
2) adding the weighed hydroxyl-containing adhesive, secondary oxidant, cross-linking agent and functional auxiliary agent into the hydroxylamine nitrate HAN aqueous solution for complete dissolution to obtain uniform slurry; the functional auxiliary agent comprises a buffering stabilizer, a chelating stabilizer, a fuel additive and a heat stabilizer;
3) concentrating and dewatering the slurry obtained in the step 2);
4) pouring the concentrated slurry into a mold, freezing and solidifying to obtain the electrically-controlled solid propellant with good uniformity;
adding the weighed hydroxyl-containing adhesive, secondary oxidant, cross-linking agent and functional auxiliary agent into the hydroxylamine nitrate HAN aqueous solution in the step 2), heating to 80 ℃, and stirring until the hydroxyl-containing adhesive, the secondary oxidant, the cross-linking agent and the functional auxiliary agent are completely dissolved;
in the step 3), cooling the slurry obtained in the step 2) to 50 ℃, stirring under a vacuum condition for concentration and dehydration treatment, cooling water vapor through a condensing tube, flowing into a receiving bottle until the water content in the receiving bottle accounts for 94% of the total mass of the hydroxylamine nitrate HAN aqueous solution, and stopping concentration treatment;
the freezing solidification in the step 4) comprises the following steps: freezing at-40 deg.C for 24 hr, thawing at normal temperature, and circulating for 3 times.
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