DNTF / FOX-7 (at) NC composite energetic material as well as preparation method and application thereof

Abstract

The invention discloses a DNTF / FOX-7 (at) NC composite energetic material as well as a preparation method and application thereof, and belongs to the technical field of composite energetic materials. According to the preparation method disclosed by the invention, the DNTF particles and the insensitive energetic material FOX-7 are uniformly mixed by adopting an electrostatic spraying technology, so that the particle size of the explosive particles can be effectively reduced, and as the DNTF / FOX-7-coated NC composite energetic material with the spherical empty shell structure is prepared, the particle size and surface defects of the explosive particles are effectively reduced; therefore, the mechanical sensitivity of the explosive particles is reduced, the safety performance of the explosive particles is improved, and the method can solve the technical problem that an existing preparation method is poor in sensitivity reduction effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite energetic materials, and in particular relates to a DNTF / FOX-7@NC composite energetic material and a preparation method and application thereof. Background Art

[0002] Furazan compounds have become the focus of the current development of high energy density energetic materials due to their advantages such as high energy density, high standard formation enthalpy, good thermal stability and thermal stability. 3,4-Dinitrofurazanyl furazan oxide (DNTF) is a new type of high energy density energetic material that has attracted much attention in recent years. Its comprehensive performance is better than that of octogenol (HMX) and close to that of hexanitrohexaazaisowurtzitane (CL-20). It is expected to be applied to many types of weapons and ammunition, thereby promoting the performance of modern weapons.

[0003] However, due to the high mechanical sensitivity of DNTF, its wide application is limited. Therefore, the research on the sensitivity reduction technology of DNTF explosives has attracted the attention of scholars. At present, the main means of reducing the sensitivity of explosives are spheroidization, recrystallization, eutectic, refinement, and preparation of polymer bonded explosives (PBX) by coating with inert materials. The Chinese patent application with publication number CN116283818A discloses a method for preparing spherical crystals of 3,4-dinitrofurazan-based furazan oxide. By fully dissolving 3,4-dinitrofurazan-based furazan oxide, crystallization solvent, and crystallization additive, stirring and lowering the temperature to form a supersaturated solution, and keeping the temperature for a period of time when a crystal nucleus appears; continue to stir and lower the temperature until it drops to room temperature; filter, wash and dry to obtain spherical DNTF. The spherical DNTF crystals are regular in shape, smooth in surface, with few transparent defects inside the crystals and good in fluidity. Although the DNTF crystals prepared by this method are spherical, the reduction of their sensitivity is not mentioned. Summary of the invention

[0004] The object of the present invention is to provide a DNTF / FOX-7@NC composite energetic material and a preparation method and application thereof, so as to solve the technical problem that the existing preparation method has a poor sensitivity reduction effect.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a method for preparing a DNTF / FOX-7@NC composite energetic material, comprising the following steps: The DNTF particles are added to an electrostatic spray solution containing NC, and then FOX-7 is added and mixed to obtain an electrostatic spray precursor solution; The electrostatically sprayed precursor solution is subjected to electrostatic spray treatment to obtain a treatment product; the treatment product is post-treated to obtain a DNTF / FOX-7@NC composite energetic material.

[0006] Furthermore, the electrostatic spray solution containing NC is obtained by mixing NC and a solvent; the mass percentage of NC in the electrostatic spray solution containing NC is 0.2% to 2%; The solvent is a mixed solution of acetone and N,N-dimethylformamide.

[0007] Furthermore, the volume ratio of the acetone to N,N-dimethylformamide is (1:1) to (4:1).

[0008] Furthermore, in the electrostatically sprayed precursor solution, the mass percentage of DNTF particles is 3.8% to 7.6%.

[0009] Furthermore, the mass ratio of the DNTF particles to FOX-7 is (8:2) to (5:5).

[0010] Furthermore, in the electrostatic spray treatment, the needle size range of the syringe used is 0.36mm~0.51mm; the propulsion rate range of the syringe is 0.5mL / h~1.5mL / h; the receiving distance range is 10 cm ~ 15 cm; the high-voltage power supply voltage range is 15kV~20kV.

[0011] Furthermore, the post-treatment is a drying treatment; the temperature of the drying treatment is not higher than 50°C.

[0012] The invention also discloses a DNTF / FOX-7@NC composite energetic material prepared by the preparation method.

[0013] Furthermore, the DNTF / FOX-7@NC composite energetic material has a hollow spherical shell structure.

[0014] The present invention also discloses the application of the DNTF / FOX-7@NC composite energetic material in high-energy explosives or propellants.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a method for preparing a DNTF / FOX-7@NC composite energetic material. By adopting an electrostatic spraying technology to uniformly mix DNTF particles and an insensitive energetic material FOX-7, the particle size of explosive particles can be effectively reduced. Since a DNTF / FOX-7@NC composite energetic material with a spherical hollow shell structure is prepared, the particle size and surface defects of the explosive particles are effectively reduced, thereby reducing the mechanical sensitivity of the explosive particles and improving their safety performance. The method can solve the technical problem that the existing preparation method has a poor sensitivity reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A diagram of the device used for electrostatic spray treatment of the present invention; Figure 2 The scanning electron microscope images of the raw materials DNTF particles, FOX-7 and NC used in the present invention; Among them: a-DNTF particles; b-FOX-7; c-NC; Figure 3 This is a scanning electron microscope image of the composite energetic material prepared in Comparative Example 1; Figure 4 This is a scanning electron microscope image of the DNTF / FOX-7@NC composite energetic material prepared in Example 1; Figure 5 This is a scanning electron microscope image of the DNTF / FOX-7@NC composite energetic material prepared in Example 2; Among them: a-SEM image of DNTF / FOX-7@NC composite energetic material; b-High magnification SEM image of empty shell DNTF / FOX-7@NC composite energetic material; Figure 6 This is a scanning electron microscope image of the DNTF / FOX-7@NC composite energetic material prepared in Example 3; Figure 7 This is a scanning electron microscope image of the DNTF / FOX-7@NC composite energetic material prepared in Example 4. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0018] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0019] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0020] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0021] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0022] The present invention provides a method for preparing a DNTF / FOX-7@NC composite energetic material, comprising the following steps: First, an electrostatic spray solution containing nitrocellulose (NC) is prepared; DNTF particles are added to the electrostatic spray solution containing NC and stirred for 30 min to 90 min to dissolve; after the DNTF particles are completely dissolved, 1,1-diamino-2,2-dinitroethylene (FOX-7) is added and stirred for 12 h to 24 h to dissolve, thereby obtaining an electrostatic spray precursor solution; Then the prepared precursor solution is used as follows Figure 1 The device shown is used to carry out an electrostatic spray test, and the obtained product is dried to obtain a DNTF / FOX-7@NC composite energetic material having a spherical hollow shell structure.

[0023] Preferably, the mass percentage of nitrocellulose in the electrostatic spray solution containing NC is 0.2% to 2%.

[0024] Preferably, the preparation method of the electrostatic spray solution containing NC is: Place nitrocellulose in a mixed solution of acetone and N,N-dimethylformamide (DMF), stir for 10 min to 30 min until fully dissolved, and prepare an electrostatic spray solution containing NC; Among them, the volume ratio of acetone and DMF is (1:1)~(4:1).

[0025] Preferably, the mass percentage of DNTF particles in the electrostatically sprayed precursor solution is 3.8% to 7.6%.

[0026] Preferably, the mass ratio of the DNTF particles to FOX-7 is (8:2) to (5:5).

[0027] Preferably, a preferred embodiment of the method for preparing a composite energetic material according to the present invention, wherein the needle size of the syringe used in electrostatic spraying is in the range of 0.36 mm to 0.51 mm; the propulsion rate of the syringe is in the range of 0.5 mL / h to 1.5 mL / h; the receiving distance is in the range of 10 cm to 15 cm; and the voltage of the high-voltage power supply is in the range of 15 kV to 20 kV.

[0028] Preferably, the drying is carried out in an oven at a constant temperature not higher than 50°C.

[0029] The method for preparing a composite energetic material of the present invention has the advantages of simple preparation process, good repeatability, safety and reliability.

[0030] The method for preparing a composite energetic material of the present invention can effectively reduce the particle size of explosive particles by uniformly mixing DNTF and insensitive energetic material FOX-7 using electrostatic spraying technology, thereby improving the safety performance of explosive particles.

[0031] The electrostatic spraying technology used in the present invention is not limited to the preparation of DNTF / FOX-7@NC composite energetic materials, but can also be applied to the preparation of other high-energy explosives.

[0032] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0033] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0034] Comparative Example 1 A method for preparing a composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.38 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, and continue stirring at 500 r / min until the DNTF particles are completely dissolved. The stirring time is 60 min to obtain a mixed solution of DNTF and NC; Step 3: Use a syringe to suck the mixed solution of DNTF and NC obtained in step 2, select a needle with a diameter of 0.36 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 0.5 mL / h, the receiving distance to 12 cm, turn on the high-voltage power supply, adjust the voltage to 18 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying, seal it in a sealed bag, and mark the sample as No. 1.

[0035] Example 1 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.304 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min, and a mixed solution of DNTF and NC is obtained; Dissolve 0.076 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h~24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 8:2; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.36 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 0.5 mL / h, the receiving distance to 12 cm, turn on the high-voltage power supply, adjust the voltage to 18 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying, seal it in a sealed bag, and mark the sample as No. 2.

[0036] Example 2 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.266 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min, and a mixed solution of DNTF and NC is obtained; Dissolve 0.114 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h~24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 7:3; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.36 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 0.5 mL / h, the receiving distance to 12 cm, turn on the high-voltage power supply, adjust the voltage to 18 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying, seal it in a sealed bag, and mark the sample as No. 3.

[0037] Example 3 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.228 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min, and a mixed solution of DNTF and NC is obtained; Dissolve 0.152 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h~24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 6:4; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.36 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 0.5 mL / h, the receiving distance to 12 cm, turn on the high-voltage power supply, adjust the voltage to 18 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying, seal it in a sealed bag, and mark the sample as No. 4.

[0038] Example 4 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.19 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min, and obtain a mixed solution of DNTF and NC; Dissolve 0.19 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h~24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 5:5; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.36 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 0.5 mL / h, the receiving distance to 12 cm, turn on the high-voltage power supply, adjust the voltage to 18 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying, seal it in a sealed bag and store it. The sample is marked as No. 5.

[0039] Example 5 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.19 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min, and obtain a mixed solution of DNTF and NC; Dissolve 0.19 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h~24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 5:5; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.51 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 1.5 mL / h, the receiving distance to 10 cm, turn on the high-voltage power supply, adjust the voltage to 20 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 50°C oven for constant temperature drying and store it in a sealed bag.

[0040] Example 6 A method for preparing a DNTF / FOX-7@NC composite energetic material comprises the following steps: Step 1: Dissolve 0.02 g NC in a mixed solution of 4 mL acetone and 1 mL DMF, and stir at 500 r / min until the nitrocellulose is completely dissolved. The stirring time is 30 min to obtain an electrostatic spray solution containing NC. Step 2: Dissolve 0.19 g of DNTF particles in the electrostatic spray solution containing NC obtained in the first step, continue stirring at 500 r / min until the DNTF particles are completely dissolved, the stirring time is 60 min ~ 90 min, and obtain a mixed solution of DNTF and NC; Dissolve 0.19 g of FOX-7 in the obtained mixed solution of DNTF and nitrocellulose, continue stirring at 500 r / min until completely dissolved, the stirring time is 12 h ~ 24 h, and form a uniform electrostatic spray precursor solution; wherein the mass ratio of DNTF particles to FOX-7 is 5:5; Step 3: Use a syringe to inhale the electrostatically sprayed precursor solution obtained in step 2, select a needle with a diameter of 0.51 mm, fix the syringe to the syringe pump, adjust the propulsion rate to 1.5 mL / h, the receiving distance to 15 cm, turn on the high-voltage power supply, adjust the voltage to 15 kV, perform electrostatic spray treatment, use aluminum foil to receive the sprayed explosive particles, and obtain the treated product; Step 4: After the electrostatic spray experiment is completed, use a wooden spoon to scrape the treated product on the aluminum foil receiving plate into the glass tray. After collection, place it in a 45°C oven for constant temperature drying and store it in a sealed bag.

[0041] Characterization test: The raw materials DNTF, FOX-7, NC and the DNTF / FOX-7@NC composite energetic materials obtained in Examples 1 to 4 and Comparative Example 1 were subjected to SEM characterization. The results are as follows: Figure 2-Figure 7 As shown in the figure, the analysis shows that the DNTF / FOX-7@NC composite material prepared by electrostatic spraying has a regular morphology, all of which are spherical shells with small particle size. However, the raw material DNTF crystals are irregular blocks with a relatively rough surface; the raw material FOX-7 crystals are irregular polyhedral structures with sharp edges and large particle size; the raw material NC is in the form of long fibers with a length of several hundred microns.

[0042] Table 1 shows the mechanical sensitivity test results of Examples 1 to 4, Comparative Example 1 and raw materials DNTF, FOX-7 and NC. 50 =10 cm, FS=126 N), the impact sensitivity and friction sensitivity of implementation examples 2-5 are significantly reduced, greatly improving the safety performance of DNTF. Among them, when the mass ratio of DNTF to FOX-7 is 5:5, the sensitivity reduction effect of the composite energetic material is the most significant, with a characteristic drop height of 55±5 cm, an impact energy of 26.95 J, and a critical load of friction sensitivity greater than 360 N, indicating that the safety performance of the DNTF / FOX-7@NC composite material prepared by the electrostatic spraying method is significantly improved.

[0043] Table 1 Mechanical sensitivity test results of materials prepared in different embodiments

[0044] Note: H 50 For the characteristics of high; FS is the friction energy.

[0045] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a DNTF / FOX-7@NC composite energetic material, characterized in that: The following steps are involved: The DNTF particles are added to an electrostatic spray solution containing NC, and then FOX-7 is added and mixed to obtain an electrostatic spray precursor solution; electrostatically spraying the electrostatically sprayed precursor solution to obtain a treated product; The treated product is post-treated to obtain a DNTF / FOX-7@NC composite energetic material.

2. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 1, characterized in that: The electrostatic spray solution containing NC is obtained by mixing NC and a solvent; the mass percentage of NC in the electrostatic spray solution containing NC is 0.2% to 2%; The solvent is a mixed solution of acetone and N,N-dimethylformamide.

3. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 2, characterized in that: The volume ratio of the acetone to N,N-dimethylformamide is (1:1) to (4:1).

4. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 1, characterized in that: In the electrostatically sprayed precursor solution, the mass percentage of DNTF particles is 3.8% to 7.6%.

5. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 1, characterized in that: The mass ratio of the DNTF particles to FOX-7 is (8:2) to (5:5).

6. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 1, characterized in that: In the electrostatic spray treatment, the needle size of the syringe used is in the range of 0.36 mm to 0.51 mm; the propulsion rate of the syringe is in the range of 0.5 mL / h to 1.5 mL / h; the receiving distance is in the range of 10 cm to 15 cm; and the voltage of the high-voltage power supply is in the range of 15 kV to 20 kV.

7. The method for preparing a DNTF / FOX-7@NC composite energetic material according to claim 1, characterized in that: The post-treatment is a drying treatment; the temperature of the drying treatment is not higher than 50°C.

8. A DNTF / FOX-7@NC composite energetic material, characterized in that: The method is prepared by any one of claims 1 to 8.

9. The DNTF / FOX-7@NC composite energetic material according to claim 8, characterized in that: The DNTF / FOX-7@NC composite energetic material has a hollow spherical shell structure.

10. Use of the DNTF / FOX-7@NC composite energetic material according to claim 8 or 9 in high energy explosives or propellants.

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