Paraffin-containing fuel based on network interpenetration principle and preparation method thereof

Abstract

The invention provides paraffin-containing fuel based on a network interpenetration principle and a preparation method of the paraffin-containing fuel. The paraffin-containing fuel is prepared from the following raw materials in percentage by mass: 40-60% of paraffin, 10-30% of polyethylene glycol, 2-8% of polyethylene oxide, 1-2% of an interface regulator, 1-3% of nano carbon powder, 0-30% of metal aluminum powder and the balance of toluene diisocynate. According to the paraffin-containing fuel formula and the preparation method thereof, polyethylene glycol is used as a main adhesive, polyethylene oxide is used as an auxiliary adhesive, the polyethylene glycol and the polyethylene oxide can be blended to form an interpenetrating network structure, and the mechanical property of the paraffin-containing fuel is further enhanced; the interface regulator can improve the compatibility between the adhesive system and the paraffin component; the nano carbon powder can improve the combustion efficiency of the paraffin-containing fuel; the metal aluminum powder can improve the combustion heat value of the paraffin-containing fuel; and the toluene diisocynate and the adhesive solution are subjected to a curing cross-linking effect to promote the formation and curing of a network structure, so that a stable structure is formed, and the strength of the paraffin-containing fuel is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of propellant preparation for solid-liquid hybrid engines, and particularly relates to a paraffin-containing fuel based on the principle of network interpenetration and a preparation method of the paraffin-containing fuel. Background Art

[0002] Solid-liquid hybrid engines combine the advantages of simple structure of solid rocket engines and adjustable thrust of liquid rocket engines, and have the advantages of high safety, multiple start-up and shutdown capabilities, easy thrust adjustment, and low cost. Among them, solid-liquid hybrid engines using paraffin as fuel are particularly prominent: Paraffin has a low melting point and boiling point. During the combustion process, its surface is easily melted to form an unstable molten layer with low viscosity and low surface tension. In addition to the paraffin itself evaporating to generate gas, the unstable molten layer will also form droplets under the shearing action of high-speed airflow and be entrained into the boundary layer for combustion. This makes paraffin have a high burning surface regression rate, thus significantly improving the combustion efficiency and thrust adjustment ability of solid-liquid hybrid engines, showing significant application advantages in solid-liquid hybrid engines.

[0003] However, paraffin is a low-molecular organic compound with weak intermolecular forces, resulting in poor strength and ductility of paraffin fuel. This characteristic leads to the following technical challenges in its practical application: (1) Solid fuel may be subjected to external forces such as vibration and impact during storage and transportation, and is prone to deformation or even breakage; (2) During the operation of the engine, high-temperature and high-pressure gas will scour the fuel, and paraffin with poor mechanical properties is prone to deformation, fracture or even breakage, resulting in deteriorated flow field and even engine failure, reducing the performance stability and reliability of the engine. To address the above problems, the prior art usually uses methods such as adding adhesives or introducing a high-mechanical-strength structural framework to enhance the mechanical properties of paraffin fuel.

[0004] In the existing literature "Experimental Study on the Combustion Mechanism of 3D Printed Skeleton-Reinforced Paraffin Fuel", 3D printed high-strength polymer ABS is used as the skeleton, and 58# fully refined paraffin is embedded in it to enhance the structural strength of paraffin-based fuel. Research shows that during the combustion process, the structural stability of the skeleton-reinforced paraffin fuel is good, and there is no phenomenon of softening and collapse or overall shedding of the paraffin fuel, and the tensile strength is large but the elongation at break is poor. However, due to the difference in the combustion regression rate between the skeleton reinforcement material and paraffin, as the combustion process progresses, the fuel surface is no longer flat, which may lead to significant changes in engine performance. In addition, the 3D printed skeleton needs to be pre-designed with a specific grain shape to meet the performance enhancement requirements, further increasing the experimental cost.

[0005] Chinese Patent No. 201610021527.1 discloses a "preparation method of paraffin-containing fuel". In this preparation method, paraffin is modified through catalytic oxidation to introduce hydroxyl functional groups for chain extension into the paraffin molecular chain, converting paraffin into polar molecules. The chain extension reaction of tris(2-methyl-1-aziridine) phosphine oxide chain extender with modified paraffin is used to increase the fuel dropping point, and hydroxyl-terminated polybutadiene or carboxyl-terminated polybutadiene binder is introduced to improve the mechanical properties of the fuel. In this formulation, both the modified paraffin and the binder are polar molecules, and there is no tendency to stratify during the curing reaction. The prepared paraffin-containing fuel has the advantages of good mechanical properties and high burning surface recession rate. However, in the engine combustion chamber, after the paraffin melts, a single binder network may not be able to independently support the fuel structure, resulting in the collapse and deformation of the fuel, thereby affecting the combustion performance. Summary of the Invention

[0006] The object of the present invention is to solve the technical problem of poor mechanical properties of paraffin-containing fuels in the prior art, and to provide a paraffin-containing fuel based on the principle of interpenetrating networks and a preparation method for the same.

[0007] To achieve the above object, the technical solution provided by the present invention is as follows:

[0008] A paraffin-containing fuel based on the principle of interpenetrating networks is provided, which is composed of the following raw materials in mass percentage: paraffin 40 - 60%, polyethylene glycol 10 - 30%, polyethylene oxide 2 - 8%, interfacial modifier 1 - 2%, nano-carbon powder 1 - 3%, aluminum powder 0 - 30%, and the balance is toluene diisocyanate.

[0009] Further, the interfacial modifier is isomeric tridecanol polyoxyethylene ether or isomeric decanol polyoxyethylene ether.

[0010] A preparation method for the above paraffin-containing fuel based on the principle of interpenetrating networks is also provided, including the following steps:

[0011] Step 1. Pretreat paraffin:

[0012] After melting the paraffin, add the interfacial modifier according to the mass percentage and stir to make the interfacial modifier fully dispersed in the paraffin to obtain a paraffin slurry.

[0013] Step 2. Prepare the paraffin-containing fuel:

[0014] Step 2.1: Mix polyethylene glycol and polyethylene oxide according to the mass percentage and heat and stir, then add part of toluene diisocyanate and stir to obtain a binder solution.

[0015] Step 2.2: Add the paraffin slurry obtained in Step 1 to the binder solution and stir to obtain a mixture.

[0016] Step 2.3: Add nano-carbon powder to the mixture obtained in Step 2.2 according to the mass percentage and stir, and then add aluminum powder according to the mass percentage and stir to obtain a mixed slurry;

[0017] Step 2.4: Add the remaining toluene diisocyanate to the mixed slurry obtained in Step 2.3 according to the curing parameters, stir evenly and then carry out vacuum casting. After curing, a paraffin fuel is obtained.

[0018] Further, the specific steps of Step 1 include:

[0019] Step 1.1: Weigh paraffin according to the mass percentage and place it in a reaction vessel at 80 °C, heat it until the paraffin is completely melted, and use a stirrer to stir. The stirring speed is controlled at 80-100 r / min;

[0020] Step 1.2: Weigh an interfacial modifier according to the mass percentage and add it to the paraffin melted in Step 1.1, and stir for 20-25 min.

[0021] Further, in Step 2.1, the added part of toluene diisocyanate is 30%-40% of the total content of toluene diisocyanate.

[0022] Further, in Step 2.1, the stirring speed when polyethylene glycol and polyethylene oxide are mixed is 120-140 r / min, and the heating temperature is 80 °C; then add part of toluene diisocyanate and stir for 1.5-2.0 h.

[0023] Further, in Step 2.2, the paraffin slurry and the binder liquid are stirred for 30-40 min.

[0024] Further, in Step 2.3, add nano-carbon powder to the mixture and stir for 20-25 min to uniformly disperse the nano-carbon powder; then add aluminum powder and stir for 20-25 min to uniformly distribute the aluminum powder.

[0025] Further, in Step 2.4, add toluene diisocyanate to the mixed slurry and stir for 10-15 min; during curing, cure at 70 °C for 120 h.

[0026] Further, in Step 2.4, the range of the curing parameters is 1-1.3.

[0027] The advantages of the present invention are:

[0028] 1. The paraffin-containing fuel formula and its preparation method designed by the present invention use polyethylene glycol as the main binder and polyethylene oxide as the secondary binder. Polyethylene oxide and polyethylene glycol are different molecular weight expressions of the same substance, so the two can be blended to form an interpenetrating network structure, further enhancing the mechanical properties of the paraffin-containing fuel; the interfacial regulator can improve the compatibility between the binder liquid and the paraffin component, making the internal structure of the paraffin-containing fuel more uniform; nano-carbon powder can increase the absorption capacity of the paraffin-containing fuel for thermal radiation and improve the combustion efficiency of the paraffin-containing fuel; metallic aluminum powder can increase the calorific value of the paraffin-containing fuel and provide greater thrust for the engine; toluene diisocyanate undergoes a curing crosslinking reaction with the binder liquid, promoting the formation and curing of the network structure, thereby forming a stable structure, improving the strength of the paraffin-containing fuel, and effectively avoiding the problems of uneven surface and collapse deformation during the combustion process of the paraffin-containing fuel.

[0029] 2. In the binder liquid mixed in the present invention, polyethylene glycol has a low molecular weight, good flexibility, and certain compatibility with paraffin; polyethylene oxide has a large molecular weight and good mechanical properties. Using polyethylene glycol as the main binder and polyethylene dioxide as the secondary binder to form an interpenetrating network structure, the main body of the binder is mutually soluble and has certain compatibility with paraffin, so that the prepared paraffin-containing fuel has the characteristics of shock resistance, high strength, and tensile resistance, and can meet the requirements of multiple scenarios such as solid fuel storage, transportation, and engine operation. Detailed implementation mode

[0030] The present invention will be described in detail below with the aid of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration and does not limit the present invention.

[0031] In order to solve the technical problem of poor mechanical properties of paraffin-containing fuels used in existing solid-liquid hybrid engines, the present invention provides a paraffin-containing fuel based on the principle of network interpenetration and a preparation method for the paraffin-containing fuel.

[0032] The paraffin-containing fuel based on the principle of network interpenetration provided by the present invention is composed of the following raw materials in mass percentage: paraffin 40 - 60%, polyethylene glycol 10 - 30%, polyethylene oxide 2 - 8%, interfacial regulator 1 - 2%, nano-carbon powder 1 - 3%, metallic aluminum powder 0 - 30%, and the balance is toluene diisocyanate (TDI).

[0033] Among them, the interfacial regulator is isomeric tridecyl alcohol polyoxyethylene ether or isomeric decyl alcohol polyoxyethylene ether.

[0034] The preparation method of the above-mentioned paraffin-containing fuel based on the principle of network interpenetration of the present invention includes the following steps:

[0035] Step 1. Pretreat paraffin:

[0036] Step 1.1: Weigh paraffin by mass percentage and place it in a reaction vessel at 80 °C. Heat it until the paraffin is completely melted, and use a stirrer to stir it with the stirring speed controlled at 80 - 100 r / min;

[0037] Step 1.2: Weigh an interfacial modifier by mass percentage and add it to the melted paraffin obtained in Step 1.1, and stir for 20 - 25 min.

[0038] Step 2. Prepare paraffin - containing fuel:

[0039] Step 2.1: Place polyethylene glycol and polyethylene oxide in a reactor at 80 °C according to mass percentage for mixing and heating, and the stirring speed is 120 - 140 r / min; then add 30% - 40% of the total content of toluene diisocyanate and stir for 1.5 - 2.0 h to obtain an adhesive liquid;

[0040] Step 2.2: Add the paraffin slurry obtained in Step 1 to the adhesive liquid and stir for 30 - 40 min to obtain a mixed liquid;

[0041] Step 2.3: Add nano - carbon powder to the mixed liquid obtained in Step 2.2 by mass percentage and stir for 20 - 25 min to make the nano - carbon powder evenly dispersed, and then add aluminum powder by mass percentage and stir for 20 - 25 min to make the aluminum powder evenly distributed to obtain a mixed slurry;

[0042] Step 2.4: Add the remaining toluene diisocyanate to the mixed slurry obtained in Step 2.3 according to the curing parameters, stir for 10 - 15 min, then vacuum - pour it into a mold and cure it at 70 °C for 120 h to obtain the paraffin - containing fuel based on the principle of interpenetrating network.

[0043] Among them, the curing parameter refers to the parameter for calculating the ratio of the mixed slurry to toluene diisocyanate based on the molar equivalent ratio of the hydroxyl group (—OH) in the adhesive liquid to the isocyanate group (—NCO) in toluene diisocyanate. The range of the curing parameter is 1 - 1.3.

[0044] The present invention uses polyethylene glycol as the main binder. It is a low-molecular-weight substance with good flexibility and certain compatibility with paraffin; polyethylene oxide is the secondary binder, and its high molecular weight endows the paraffin-containing fuel with good mechanical properties; it and polyethylene glycol are different molecular weight expressions of the same substance, so the two can be blended to form an interpenetrating network structure, thus enabling the prepared paraffin-containing fuel to have the characteristics of impact resistance, high strength and tensile resistance, further enhancing the mechanical properties of the paraffin-containing fuel; the added interfacial regulator can improve the compatibility between the binder system and the paraffin component, making the internal structure of the paraffin-containing fuel more uniform; adding nano-carbon powder can increase the absorption capacity of the paraffin-containing fuel for thermal radiation and improve the combustion efficiency of the paraffin-containing fuel; the added aluminum powder can increase the energy density and combustion calorific value of the paraffin-containing fuel, providing greater thrust for the engine; TDI is used as a curing agent to chemically react with the binder system, promoting the formation and curing of the network structure, thus forming a stable structure. It can effectively avoid the problems of uneven surface and collapse deformation during the combustion process of the paraffin-containing fuel.

[0045] Among them, isomeric tridecyl alcohol polyoxyethylene ether or isomeric decyl alcohol polyoxyethylene ether is introduced as the interfacial regulator to ensure better compatibility between paraffin and the binder system, so as to prepare a fuel with good uniformity and mechanical properties. The branched alkyl structure of the isomeric alcohol (isomeric tridecyl alcohol and isomeric decyl alcohol) in the interfacial regulator is a non-polar substance, which can be effectively embedded in non-polar paraffin; while the polyoxyethylene chain contains a large number of ether bonds, has good hydrophilicity, and can form hydrogen bonds with polar substances such as polyethylene glycol, enhancing its solubility in polar binders. In the paraffin-containing fuel, the branched alkyl of the interfacial regulator extends towards the paraffin, and the polyoxyethylene ether extends towards the binder, realizing the stable dispersion of the binder and paraffin by reducing the interfacial tension between the two phases.

[0046] The preparation method of the high-strength paraffin-containing fuel based on azide binder provided by the present invention will be further described below with reference to Examples 1 to 5. In Examples 1 to 5, when curing and molding, toluene diisocyanate is added according to the index of curing parameter 1.

[0047] Example 1

[0048] Each raw material is weighed according to the following mass percentages: paraffin wax 55%, polyethylene glycol 15%, polyethylene oxide 6.4%, isomeric tridecyl alcohol polyoxyethylene ether 2%, nano-carbon powder 2%, aluminum powder 16%, TDI 3.6%. The above raw materials are processed as follows: First, place the solid paraffin wax in a reaction vessel at 80°C and stir at a speed of 80 r / min. After the paraffin wax is completely melted, add isomeric tridecyl alcohol polyoxyethylene ether and stir for 20 min until evenly mixed, then the pre-treated paraffin wax slurry can be obtained. Place polyethylene glycol and polyethylene oxide in a reaction vessel at 80°C for blending, set the stirring rate to 120 r / min, stir for 60 min, then add 1.1% TDI and stir for 1.5 h to achieve the prepolymerization of the adhesive system. Subsequently, add the paraffin wax slurry into it and stir for 30 min to achieve the uniform mixing of the two. Then add nano-carbon powder and aluminum powder in sequence and stir for 25 min each to ensure uniform mixing. Finally, add 2.5% TDI and stir for 15 min, then pour the mixture in the reaction vessel into a mold under vacuum and cure at 70°C for 120 h to obtain the paraffin-containing fuel.

[0049] Example 2

[0050] Each raw material is weighed according to the following mass percentages: paraffin wax 58%, polyethylene glycol 25%, polyethylene oxide 7.3%, isomeric tridecyl alcohol polyoxyethylene ether 2%, nano-carbon powder 2%, TDI 5.7%. The above raw materials are processed as follows: First, place the solid paraffin wax in a reaction vessel at 80°C and stir at a speed of 80 r / min. After the paraffin wax is completely melted, add isomeric tridecyl alcohol polyoxyethylene ether and stir for 20 min until evenly mixed, then the pre-treated paraffin wax slurry can be obtained. Place polyethylene glycol and polyethylene oxide in a reaction vessel at 80°C for blending, set the stirring rate to 120 r / min, stir for 60 min, then add 1.7% TDI and stir for 1.5 h to achieve the prepolymerization of the adhesive system. Subsequently, add the paraffin wax slurry into it and stir for 30 min to achieve the uniform mixing of the two. Add nano-carbon powder and stir for 25 min to ensure uniform mixing. Finally, add 4% TDI and stir for 15 min, then pour the mixture in the reaction vessel into a mold under vacuum and cure at 70°C for 120 h to obtain the paraffin-containing fuel.

[0051] Example 3

[0052] Each raw material is weighed according to the following mass percentages: paraffin wax 55%, polyethylene glycol 15%, polyethylene oxide 6.4%, isodecyl alcohol polyoxyethylene ether 2%, nano-carbon powder 2%, aluminum powder 16%, TDI 3.6%. The above raw materials are processed as follows: First, place the solid paraffin wax in a reaction vessel at 80 °C and stir at a speed of 80 r / min. After the paraffin wax is completely melted, add isodecyl alcohol polyoxyethylene ether and stir for 20 min until evenly mixed, then the pre-treated paraffin wax slurry can be obtained. Place polyethylene glycol and polyethylene oxide in a reaction vessel at 80 °C for blending, set the stirring rate to 120 r / min, after stirring for 60 min, add 1.1% TDI and stir for 1.5 h to achieve the prepolymerization of the binder system. Subsequently, add the paraffin wax slurry into it and stir for 30 min to achieve the uniform mixing of the two. Add nano-carbon powder and aluminum powder in sequence and stir for 25 min each to ensure uniform mixing. Finally, add 2.5% TDI and stir for 15 min, then pour the mixture in the reaction vessel into a mold under vacuum and cure at 70 °C for 120 h to obtain the paraffin-containing fuel.

[0053] Example 4

[0054] Each raw material is weighed according to the following mass percentages: paraffin wax 58%, polyethylene glycol 25%, polyethylene oxide 7.3%, isodecyl alcohol polyoxyethylene ether 2%, nano-carbon powder 2%, TDI 5.7%. The above raw materials are processed as follows: First, place the solid paraffin wax in a reaction vessel at 80 °C and stir at a speed of 80 r / min. After the paraffin wax is completely melted, add isodecyl alcohol polyoxyethylene ether and stir for 20 min until evenly mixed, then the pre-treated paraffin wax slurry can be obtained. Place polyethylene glycol and polyethylene oxide in a reaction vessel at 80 °C for blending, set the stirring rate to 120 r / min, after stirring for 60 min, add 1.7% TDI and stir for 1.5 h to achieve the prepolymerization of the binder system. Subsequently, add the paraffin wax slurry into it and stir for 30 min to achieve the uniform mixing of the two. Add nano-carbon powder and stir for 25 min to ensure uniform mixing. Finally, add 4% TDI and stir for 15 min, then pour the mixture in the reaction vessel into a mold under vacuum and cure at 70 °C for 120 h to obtain the paraffin-containing fuel.

[0055] Example 5

[0056] Each raw material is weighed according to the following mass percentages: paraffin wax 40%, polyethylene glycol 30%, polyethylene oxide 8%, isomeric tridecyl alcohol polyoxyethylene ether 2%, nano-carbon powder 2%, aluminum powder 11.2%, and TDI 6.8%. The above raw materials are processed as follows: First, place the solid paraffin wax in a reaction vessel at 80°C and stir at a speed of 80 r / min. After the paraffin wax is completely melted, add isomeric tridecyl alcohol polyoxyethylene ether and stir for 20 min until evenly mixed to obtain the pretreated paraffin wax slurry. Place polyethylene glycol and polyethylene oxide in a reaction vessel at 80°C and blend them. Set the stirring rate to 120 r / min and stir for 60 min. Then add 2.0% TDI and stir for 1.5 h to achieve the prepolymerization of the adhesive system. Subsequently, add the paraffin wax slurry into it and stir for 30 min to achieve the uniform mixing of the two. Add nano-carbon powder and aluminum powder in sequence and stir for 25 min each to ensure uniform mixing. Finally, add 4.8% TDI and stir for 15 min, then pour the mixture in the reaction vessel into a mold under vacuum and cure it at 70°C for 120 h to obtain the paraffin fuel-containing product.

[0057] Comparative example

[0058] Heat 250 g of paraffin wax to 210°C, then introduce air with a flow rate of 4 L / min, and slowly add 21 g of boric acid while maintaining the temperature at 200°C. One hour after adding boric acid, perform vacuum distillation at a temperature of 180°C and a pressure of 10 Pa. Pour the residue after vacuum distillation into hot water at 80°C with a volume of 600 ml, stir for 30 minutes, and then take the upper layer substance and perform vacuum drying to obtain modified paraffin wax.

[0059] Weigh each raw material according to the mass percentages of 50% modified paraffin wax, 12% tris(2-methyl-1-aziridine) phosphine oxide, and 38% carboxyl-terminated polybutadiene. First, place the modified paraffin wax in a mixing pot at 60°C. After the modified paraffin wax melts, add tris(2-methyl-1-aziridine) phosphine oxide and hydroxyl-terminated polybutadiene in sequence according to the formula and stir and mix for 45 minutes. Perform vacuum casting on the mixed liquid slurry at a temperature of 60°C and pour the slurry into a mold. Place the mold with the poured slurry in a vacuum curing box and cure it at a temperature of 65°C for 72 hours. After demolding, obtain the paraffin fuel-containing product.

[0060] Using the relevant specified methods, the paraffin-containing fuels prepared in Examples 1 to 5 and the comparative example were made into dumbbell-shaped Type B specimens. The engineering gauge length of the specimens was 70 mm ± 0.5 mm, and the thickness was 10 mm ± 0.5 mm. After the specimens were prepared, they were placed in an environment at a temperature of 25 °C for 24 hours, and the mechanical property experiments of the fuel at room temperature were carried out, where the tensile rate was set at 5 mm / min. The maximum tensile strength and elongation at break of the specimens prepared in the comparative example were 0.71 MPa and 26%. Among Examples 1 to 5, as the content of the binder increased, the maximum tensile strength decreased, but the elongation at break increased significantly. Its maximum tensile strength was all above 0.75 MPa, and the elongation at break was not less than 30%. After adding aluminum powder in Examples 1, 3, and 5, the maximum tensile strength increased, but it would cause a decrease in the elongation at break. When it is necessary to increase the energy of the paraffin-containing fuel and improve the burning rate, adding aluminum powder can be selected to achieve this. A suitable formula can be selected according to the actual situation.

[0061] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention can be combined in the same or similar way into one or more other embodiments, combined with the features in other embodiments or replace the corresponding features in other embodiments. The technical solutions obtained by such combination or substitution should also be regarded as being included within the protection scope of the present invention.

Claims

1. A paraffin-containing fuel based on the principle of network interpenetration, characterized in that, It consists of the following raw materials by mass percentage: paraffin 40 - 60%, polyethylene glycol 10 - 30%, polyethylene oxide 2 - 8%, interfacial regulator 1 - 2%, nano-carbon powder 1 - 3%, metallic aluminum powder 0 - 30%, and the balance is toluene diisocyanate.

2. The paraffin-containing fuel according to claim 1, characterized in that, The interfacial regulator is isomeric tridecyl alcohol polyoxyethylene ether or isomeric decyl alcohol polyoxyethylene ether.

3. The preparation method of a paraffin-containing fuel based on the principle of network interpenetration according to any one of claims 1 to 2, characterized in that, It includes the following steps: Step 1. Pretreat paraffin: Melt paraffin and add the interfacial regulator according to the mass percentage and stir to make the interfacial regulator fully dispersed in paraffin to obtain a paraffin slurry. Step 2. Prepare paraffin-containing fuel: Step 2.1: Mix polyethylene glycol and polyethylene oxide according to the mass percentage and heat and stir, then add part of toluene diisocyanate and stir to obtain an adhesive liquid. Step 2.2: Add the paraffin slurry obtained in Step 1 to the adhesive liquid and stir to obtain a mixture. Step 2.3: Add nano-carbon powder to the mixture obtained in Step 2.2 according to the mass percentage and stir, then add metallic aluminum powder according to the mass percentage and stir to obtain a mixed slurry. Step 2.4: Add the remaining toluene diisocyanate to the mixed slurry obtained in Step 2.3 according to the curing parameters, stir evenly and then carry out vacuum casting, and after curing, obtain paraffin-containing fuel.

4. The preparation method according to claim 3, characterized in that, The specific steps of Step 1 include: Step 1.1: Weigh paraffin according to the mass percentage and place it in a reaction vessel at 80°C, heat until the paraffin is completely melted, and use a stirrer to stir, with the stirring speed controlled at 80 - 100 r / min. Step 1.2: Weigh the interfacial regulator according to the mass percentage and add it to the paraffin melted in Step 1.1, and stir for 20 - 25 min.

5. The preparation method according to claim 3, characterized in that, In Step 2.1, the part of toluene diisocyanate added is 30% - 40% of the total content of toluene diisocyanate.

6. The preparation method according to claim 3, characterized in that, In Step 2.1, the stirring speed when mixing polyethylene glycol and polyethylene oxide is 120 - 140 r / min, and the heating temperature is 80°C; then add part of toluene diisocyanate and stir for 1.5 - 2.0 h.

7. The preparation method according to claim 3, characterized in that In Step 2.2, the paraffin slurry and the adhesive liquid are stirred for 30 - 40 min.

8. The preparation method according to claim 3, characterized in that, In Step 2.3, add nano-carbon powder to the mixture and stir for 20 - 25 min to make the nano-carbon powder evenly dispersed; then add metallic aluminum powder and stir for 20 - 25 min to make the metallic aluminum powder evenly distributed.

9. The preparation method according to claim 3, wherein In Step 2.4, add toluene diisocyanate to the mixed slurry and stir for 10 - 15 min; during curing, cure at 70°C for 120 h.

10. The preparation method according to claim 3, characterized in that, In Step 2.4, the range of the curing parameter is 1 - 1.3.