Boron-containing nanoparticle gel propellant and preparation method thereof
By using supramolecular gelling factors with specific structures and specific stirring methods, a high-boron-content gel propellant was prepared, solving the problem of balancing storage stability and flowability in existing technologies and achieving highly efficient propellant performance.
Patent Information
- Application Number
- CN202511219830.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-28
- Publication Date
- 2025-11-25
AI Technical Summary
Existing technologies make it difficult to prepare gel propellants that simultaneously possess high boron content, high static viscosity, and low limiting shear viscosity without introducing additional functional additives, resulting in a difficulty in achieving both storage stability and flowability.
By employing a supramolecular gel factor with a specific structure, a three-dimensional network framework is formed through non-covalent interactions between small molecules, achieving stability of high boron content and low limiting shear viscosity. By mixing hydrocarbon fuels with boron nanoparticles and combining them with a specific stirring method, a gel propellant that meets the requirements of engine operating conditions can be prepared.
This approach achieves a balance between storage stability and flowability in high-boron-content gel propellants, ensuring long-term stability and flow atomization performance while avoiding energy performance loss and preparation complexity caused by additional additives.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of propellants, in particular to a boron nanoparticle-containing gel propellant and a preparation method thereof. BACKGROUND
[0002] Gel propellant is a semi-solid system formed by adding gelling agent to liquid fuel. It is concerned because it has controllable thrust of liquid propellant and high density and high reliability of solid propellant. In order to further improve the energy characteristics of the propellant, boron nanoparticles with extremely high calorific value are introduced into the gel system, which is an important technical development direction that can significantly improve the energy density and combustion efficiency of the propellant.
[0003] However, in practice, it is found that to prepare an ideal boron-containing gel propellant, a pair of inherent performance contradictions must be solved. On the one hand, in order to achieve high energy density, the content of boron nanoparticles needs to be as high as possible, but this will cause the particles to easily settle due to the density difference, so the gel system must have a high enough static viscosity to form an effective suspension support network to ensure long-term storage stability. On the other hand, the propellant must have good flowability during transportation and atomization, that is, its viscosity must decrease rapidly under high shear force, showing extremely low limiting shear viscosity. In the prior art, it is difficult to simultaneously meet the requirements of high static viscosity and low limiting shear viscosity, which are two mutually contradictory rheological properties, by simply adjusting the conventional preparation method of the basic components (fuel, gelling agent, boron powder).
[0004] To solve the above contradictions, further improvement schemes in the prior art usually introduce additional functional additives into the gel system, such as using surfactants to improve the dispersibility of boron powder, or using specific rheological modifiers to enhance the shear thinning properties of the system. Although such schemes alleviate the problem to some extent, they introduce new and more difficult to overcome technical defects: first, these functional additives usually do not contribute to energy, and their addition will dilute the effective components of the propellant, causing a loss of energy performance; second, the introduction of multi-component systems increases the complexity and uncertainty of the preparation process, and the long-term chemical compatibility between components is difficult to guarantee, which may have a negative impact on the long-term stability of the propellant.
[0005] Therefore, how to develop a new type of gel propellant that can simultaneously achieve high boron content, high static viscosity (to ensure storage stability) and low limiting shear viscosity (to ensure flow and atomization performance) without introducing additional functional additives (such as dispersants, adhesives, etc.) through the optimization design of core components and the innovation of preparation process, constitutes a technical problem that needs to be solved in this field at present. SUMMARY
[0006] The present application provides a kind of boron-containing nanoparticle gel propellant and its preparation method to at least partially solve the above problems in the prior art.
[0007] Specifically, the first aspect, the present application provides a kind of boron-containing nanoparticle gel propellant, comprising: hydrocarbon fuel, boron nanoparticles and gelator;The gelator is selected from the compound shown in the following structural formula: Wherein, R1 is alkyl with 8-14 carbon atoms;R2 is alkyl with 8-14 carbon atoms.
[0008] Supramolecular gel is a kind of material that makes liquid into gel through non-covalent interaction between small molecules.The assembly unit of this gel has diversity, and the structure of the assembly unit is realized by the synergistic effect of multiple weak interaction forces (such as hydrogen bond, van der Waals force, π-π stacking, etc.), which realizes wide-range regulation of the mechanical and rheological properties of the propellant.This regulation ability enables supramolecular gel to meet the needs of different engine operating conditions, thereby providing new possibilities for the performance improvement of liquid hydrocarbon fuel.The present application utilizes the concept of supramolecular chemistry to make liquid into gel through non-covalent interaction between small molecules.Due to the diversity of the assembly unit of supramolecular gel, the structure of the assembly unit realizes wide-range regulation of the mechanical and rheological properties of the propellant by the synergistic effect of multiple weak interaction forces to meet the operating conditions of the engine.In the experiment, it is found that the gelator with the above-mentioned specific structure can form a three-dimensional network skeleton with sufficient support in the solvent system of the propellant (i.e., hydrocarbon dye) without relying on the action of additives, which can enable the propellant with high boron content to maintain excellent stability while having extremely low limiting shear viscosity and being easy to liquefy.
[0009] According to the present application, the mass fraction of boron nanoparticles in the boron-containing nanoparticle gel propellant is 50% or more.
[0010] In the present application, the mass fraction of boron nanoparticles is 50% or more, for example, it can be any value or a value range consisting of any value selected from 50%, 55%, 60%, 65%, 70%, 75%, and 80%. Preferably, it is any value or a value range consisting of any value selected from 50% to 70%.
[0011] High content of boron nanoparticles means that the density of the boron-containing nanoparticle gel propellant is also higher, which is more valuable in practice, but it is more difficult to obtain a stable system. It is found that the above-mentioned system of the present application can realize the addition of boron nanoparticles with a mass fraction of 50% or more.
[0012] The boron nanoparticle-containing gel propellant provided by the present application has a boron nanoparticle with an average particle size of 1 μm or more. Preferably, the boron nanoparticle has an average particle size of 1 μm, 10 μm, 20 μm or 30 μm, or a combination of two or more thereof.
[0013] To facilitate dispersion, more preferably, the boron nanoparticle is amorphous boron.
[0014] The boron nanoparticle-containing gel propellant provided by the present application has a gel factor with a mass percentage of 2% or less. Preferably, the mass percentage of the gel factor is 0.5% to 2%.
[0015] A high content of gel factor means that the three-dimensional network skeleton formed by the gel propellant is more stable, but at the same time, the static viscosity and shear viscosity are increased, and the increase of the gel factor may reduce the overall heat value of the propellant. The present application achieves the desired effect of the gel propellant while adding as little gel as possible (2% or less). Preferably, the mass percentage of the gel factor in the present application is 0.5% to 2%, for example, it can be any value of 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0% or a numerical range formed by any value.
[0016] The boron nanoparticle-containing gel propellant provided by the present application has a hydrocarbon fuel selected from RP-3, JP-10, an alkane compound, a cyclohexane compound, a benzene compound or a naphthalene compound.
[0017] The boron nanoparticle-containing gel propellant provided by the present application has R1 and R2 each independently selected from tetradecyl, octyl, decyl or dodecyl.
[0018] The boron nanoparticle-containing gel propellant provided by the present application has R1 and R2 being the same, and the preparation method of the gel factor comprises: BOC-glutamic acid and a carbon chain alkyl amine are subjected to condensation reaction to obtain a first product; the carbon chain alkyl amine has 8 to 14 carbon atoms; The first product is subjected to a de-BOC reaction to obtain a second product; The second product is reacted with propyl isocyanate to obtain the gel factor.
[0019] The synthesis route of the above preparation method is as follows: .
[0020] R is an alkyl group with 8-14 carbon atoms; Preferably, R is selected from tetradecyl, octyl, decyl or dodecyl.
[0021] Specifically, the preparation method of the gelator in the present application comprises the following steps: BOC-glutamic acid and carbon chain alkyl amine are mixed in a first solvent to perform condensation reaction, and then first post-treatment is performed to obtain a first product; The first product is subjected to a de-BOC reaction with an acid, and then second post-treatment is performed to obtain a second product; and the second product is reacted with propyl isocyanate to obtain the gelator.
[0022] Preferably, the first post-treatment comprises water washing, filtration and drying. Preferably, the condensation reaction is performed at a temperature of 50-100°C for 8-24h, and the stirring speed is 150-300rpm. Preferably, the first solvent is selected from one or a combination of two or more of toluene, tetrahydrofuran, dichloromethane, chloroform, ethyl acetate, acetonitrile and acetone. Preferably, the second post-treatment comprises saturated sodium carbonate solution washing, filtration and drying. Preferably, the acid is selected from one or a combination of two or more of hydrochloric acid, sulfuric acid, acetic acid and trifluoroacetic acid.
[0023] According to the present application, the static viscosity of the boron nanoparticle-containing gel propellant is 1000 Pa·s or more, and the limiting shear viscosity is 1 Pa·s or less.
[0024] The present application also provides a preparation method of the boron nanoparticle-containing gel propellant, comprising: Mixing boron nanoparticles with hydrocarbon fuel to obtain a slurry; Mixing a gelator with the slurry to obtain the boron nanoparticle-containing gel propellant.
[0025] The above method can obtain a more uniform and stable propellant.
[0026] According to the preparation method of the boron nanoparticle-containing gel propellant provided by the present application, the gelator is added to the slurry at a temperature of 80-120°C, and mechanical stirring is used for mixing, the stirring time of the mechanical stirring is within 30min, the stirring speed of the mechanical stirring is gradually reduced from the initial 800-1300rpm to 100rpm or less to end the stirring, and the boron nanoparticle-containing gel propellant is obtained. Preferably, the gradual reduction from the initial 800-1300rpm to 100rpm or less includes reducing the stirring speed for 2-5 times.
[0027] Preferably, the time for mixing the boron nanoparticles with the hydrocarbon fuel is 10-40 minutes, and the heating temperature is 80-120°C.
[0028] In this invention, the initial 800~1300rpm can be, for example, any value or a range of values among 800rpm, 850rpm, 900rpm, 950rpm, 1000rpm, 1050rpm, 1100rpm, 1150rpm, 1200rpm, 1250rpm, and 1300rpm.
[0029] This invention provides a boron-containing nanoparticle gel propellant and its preparation method. By utilizing a gel factor with a specific structure in the propellant solvent (i.e., hydrocarbon dye) system, a novel gel propellant can be simultaneously achieved with high boron content, high static viscosity (ensuring storage stability), and low limiting shear viscosity (ensuring flow atomization performance) without introducing additional functional additives. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this invention clearer, a clear and complete description of the technical solutions in this invention will be provided below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0031] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.
[0032] The preparation methods of the raw materials used in some of the embodiments are as follows: Preparation Example 1: Gel Factor This preparation example provides a hydrocarbon fuel gel with the following structural formula: ; Wherein, R is tetradecyl.
[0033] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. While stirring, add 12g of tetradecylamine, 13g of EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) and 12g of HOBT (1-hydroxybenzotriazole). Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. Wash with water, filter, and dry to obtain the first product.
[0034] (2) The first product was de-BOCed with trifluoroacetic acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0035] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of ethanol. Then add 4g of propyl isocyanate and heat under reflux to make the solution completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0036] Preparation Example 2: Gel Factor This preparation example provides a hydrocarbon fuel gel with the same structural formula as Preparation Example 1.
[0037] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of dichloromethane. Add 12g of tetradecylamine, 13g of EDC and 12g of HOBT while stirring. Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. After washing with water and filtering, dry to obtain the first product.
[0038] (2) The first product was deionized with hydrochloric acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0039] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of tetrahydrofuran. Then add 4g of propyl isocyanate and heat under reflux until the solution is completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0040] Preparation Example 3: Gel Factor This preparation example provides a hydrocarbon fuel gel with the same structural formula as Preparation Example 1.
[0041] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. Add 12g of tetradecylamine, 13g of EDC and 12g of HOBT while stirring. Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. After washing with water and filtering, dry to obtain the first product.
[0042] (2) The first product was deionized with hydrochloric acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0043] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of tetrahydrofuran. Then add 4g of propyl isocyanate and heat under reflux until the solution is completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0044] Preparation Example 4: Gel Factor This preparation example provides a hydrocarbon fuel gel with the same structural formula as Preparation Example 1.
[0045] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. Add 12g of tetradecylamine, 13g of EDC and 12g of HOBT while stirring. Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. After washing with water and filtering, dry to obtain the first product.
[0046] (2) The first product was de-BOCed with trifluoroacetic acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0047] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of tetrahydrofuran. Then add 4g of propyl isocyanate and heat under reflux until the solution is completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid.
[0048] Preparation Example 5: Gel Factor This preparation example provides a hydrocarbon fuel gel with the following structural formula: ; Where R stands for octyl.
[0049] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. While stirring, add 10g of octylamine, 13g of EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) and 12g of HOBT (1-hydroxybenzotriazole). Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. Wash with water, filter, and dry to obtain the first product.
[0050] (2) The first product was de-BOCed with trifluoroacetic acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0051] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of ethanol. Then add 4g of propyl isocyanate and heat under reflux to make the solution completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0052] Preparation Example 6: Gel Factor This preparation example provides a hydrocarbon fuel gel with the following structural formula: ; Where R is decyl.
[0053] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. While stirring, add 11g of decylamine, 13g of EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) and 12g of HOBT (1-hydroxybenzotriazole). Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. Wash with water, filter, and dry to obtain the first product.
[0054] (2) The first product was de-BOCed with trifluoroacetic acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0055] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of ethanol. Then add 4g of propyl isocyanate and heat under reflux to make the solution completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0056] Preparation Example 7: Gel Factor This preparation example provides a hydrocarbon fuel gel with the following structural formula: ; Wherein, R is dodecyl.
[0057] This preparation example also provides a method for preparing the above-mentioned hydrocarbon fuel gel, the steps of which are as follows: (1) Weigh 5g of BOC-glutamic acid and add it to a round-bottom flask containing 100ml of tetrahydrofuran. While stirring, add 11g of dodecylamine, 13g of EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) and 12g of HOBT (1-hydroxybenzotriazole). Heat and reflux at 90℃ for 8h and stir to precipitate a white solid. Wash with water, filter, and dry to obtain the first product.
[0058] (2) The first product was de-BOCed with trifluoroacetic acid, washed five times with saturated sodium carbonate solution and dried to obtain a white solid, which is the second product.
[0059] (3) Take 5g of white solid (i.e. the second product) and add it to a round-bottom flask containing 100ml of ethanol. Then add 4g of propyl isocyanate and heat under reflux to make the solution completely clear. As the reaction proceeds, the solution becomes turbid. Filter to obtain the solid and dry it in a vacuum drying oven to obtain the white solid, i.e. the gelling agent.
[0060] Example 1: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, the composition of which is shown in Table 1 below.
[0061] Table 1
[0062] This embodiment also provides a method for preparing a boron-containing nanoparticle gel propellant, the steps of which are as follows: Boron nanoparticles were added to JP-10, and the system was heated to 70°C. The mixture was stirred at 1000 rpm for 30 minutes to completely disperse the nanoparticles in JP-10. While maintaining the stirring speed, a gelling agent was added to the system, and stirring was continued for a total of 6 minutes. The mechanical stirring speed was reduced from the initial 1000 rpm to 500 rpm within 3 minutes, and then to 100 rpm within 2 minutes. Stirring was then stopped, and heating was stopped until the temperature was cooled to room temperature, which formed an invertible boron-containing nanoparticle gel propellant.
[0063] Example 2: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, the composition of which is shown in Table 1 below.
[0064] Table 2
[0065] This embodiment also provides a method for preparing boron-containing nanoparticle gel propellant, the steps of which are the same as in Example 1.
[0066] Example 3: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, the composition of which is shown in Table 1 below.
[0067] Table 3
[0068] This embodiment also provides a method for preparing boron-containing nanoparticle gel propellant, the steps of which are the same as in Example 1.
[0069] Example 4: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, the composition of which is shown in Table 1 below.
[0070] Table 4
[0071] This embodiment also provides a method for preparing boron-containing nanoparticle gel propellant, the steps of which are the same as in Example 1.
[0072] Example 5: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, which is basically the same as that in Example 4, except that the gel factor obtained in Preparation Example 4 is replaced by the gel factor obtained in Preparation Example 5 in equal mass.
[0073] Example 6: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, which is basically the same as that in Example 4, except that the gel factor obtained in Preparation Example 4 is replaced by the gel factor obtained in Preparation Example 6 in equal mass.
[0074] Example 7 Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, which is basically the same as that in Example 4, except that the gel factor obtained in Preparation Example 4 is replaced by the gel factor obtained in Preparation Example 7 by the same mass.
[0075] Example 8: Boron-containing nanoparticle gel propellant This embodiment provides a boron-containing nanoparticle gel propellant, which is basically the same as that in Example 4, except that the stirring speed is different after adding the gelling factor in the preparation method. Specifically, the initial speed of mechanical stirring is 700 rpm, which is reduced to 500 rpm within 3 minutes, and then reduced to 100 rpm within 2 minutes. Stirring is then stopped, heating is stopped, and the mixture is allowed to cool down to room temperature to form an invertible boron-containing nanoparticle gel propellant.
[0076] Test case The boron-containing nanoparticle gel propellant prepared in the above embodiments was tested. This study used a rotational rheometer for testing, and the testing method is as follows: The test used a rotational test, with a shear rate set to ~1000s. -1 The measurement temperature was 20℃, the initial value was defined as the static viscosity of the sample, and the shear rate was 1000 s⁻¹. -1 The viscosity at that point is the limiting shear viscosity.
[0077] The test results are as follows: Table 5
[0078] The data above shows that boron-containing hydrocarbon fuel gels with different structures and compositions exhibit varying static viscosities, but their overall performance is good. When hydrocarbon fuel gels are used in boron-containing nanoparticle gel propellants, their effectiveness is largely influenced by the stirring speed and processing method. When the initial speed is reduced to 700 rpm, although the gel remains in a gel state, the static and shear viscosities show significant fluctuations with repeated measurements. As the speed continues to drop below 500 rpm, the stirring time needs to be greatly extended, which can easily lead to uneven gel dispersion, resulting in an uneven colloidal propellant and an inability to form a stable, uniform gel propellant.
[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A boron-containing nanoparticle gel propellant, characterized in that, include: Hydrocarbon fuels, boron nanoparticles, and gelling agents; The gelling agent is selected from compounds with the following structural formulas: ； Wherein, R1 is an alkyl group having 8 to 14 carbon atoms; R2 is an alkyl group having 8 to 14 carbon atoms.
2. The boron-containing nanoparticle gel propellant according to claim 1, characterized in that, The boron nanoparticles in the boron-containing nanoparticle gel propellant account for more than 50% by mass.
3. The boron-containing nanoparticle gel propellant according to claim 1, characterized in that, The boron nanoparticles have an average particle size of 1 μm or more.
4. The boron-containing nanoparticle gel propellant according to claim 1, characterized in that, The mass percentage of the gelling factor in the boron-containing nanoparticle gel propellant is less than 2%.
5. The boron-containing nanoparticle gel propellant according to claim 1, characterized in that, The hydrocarbon fuel is selected from RP-3, hanging tetrahydrodicyclopentadiene, alkane compounds, cyclohexane compounds, benzene compounds, or naphthalene compounds.
6. The boron-containing nanoparticle gel propellant according to claim 1, characterized in that, R1 and R2 are each independently selected from tetradecyl, octyl, decyl, or dodecyl.
7. The boron-containing nanoparticle gel propellant according to claim 6, characterized in that, R1 and R2 are the same, and the preparation method of the gelling factor includes: BOC-glutamic acid and carbon-chain alkylamine undergo a condensation reaction to give the first product; the carbon-chain alkylamine has 8 to 14 carbon atoms. The first product undergoes a deBOC reaction to give the second product; The second product reacts with propyl isocyanate to obtain the gelling agent.
8. The boron-containing nanoparticle gel propellant according to any one of claims 1 to 7, characterized in that, The boron-containing nanoparticle gel propellant has a static viscosity of over 1000 Pa·s and an ultimate shear viscosity of less than 1 Pa·s.
9. A method for preparing the boron-containing nanoparticle gel propellant according to any one of claims 1 to 8, characterized in that, include: Boron nanoparticles were mixed with hydrocarbon fuel to obtain a slurry; The gelling agent is mixed with the slurry to obtain the boron-containing nanoparticle gel propellant.
10. The method for preparing the boron-containing nanoparticle gel propellant according to claim 9, characterized in that, The gelling agent is added to the slurry at a temperature of 80~120℃ and mixed by mechanical stirring for a duration of no more than 30 minutes. The stirring speed is gradually reduced from the initial 800~1300 rpm to below 100 rpm to stop stirring, thereby obtaining the boron-containing nanoparticle gel propellant.