Titanium / copper ferrite microwave-sensitive energetic material and preparation method and application thereof
By preparing titanium/cubic ferrate microwave-sensitive energy-containing materials, and using electrostatic spraying methods to form a tight composite structure, the problem of microwave sensitizer not participating in the reaction in the prior art is solved, and the microwave ignition effect with high energy release and short delay time is achieved.
Patent Information
- Application Number
- CN202310853597.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-12
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2043-07-12
AI Technical Summary
The microwave sensitizer introduced in existing microwave ignition energy-containing materials does not participate in the reaction, resulting in a reduction in system energy and a long microwave ignition delay time, limiting the application of microwave ignition technology.
Using titanium/cubic ferrate microwave-sensitive energy-containing materials, the microwave absorption and combustion performance are significantly improved by mixing nanoferrate copper and nanotitanium powder with polyvinylidene fluoride-hexafluoropropylene and preparing by electrostatic spraying.
High energy release and good combustion performance are achieved, which significantly reduces the microwave ignition delay time and enhances the application potential of microwave ignition.
Smart Images
Figure CN116655442B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of nano energetic materials, and particularly relates to a titanium / copper ferrite microwave-sensitive energetic material and a preparation method and application thereof. Background Art
[0002] As a new type of non-contact insensitive ignition technology, microwave ignition has many application prospects in the field of ignition and heating technology, such as microwave ignition of various engines, microwave ignition of artillery, and metallurgy, due to its many advantages such as simple structure, strong anti-interference ability, good ignition simultaneity, large ignition area, and good compensation for combustion. Microwave ignition has low energy, good selectivity, and strong volume heating ability, which can stimulate the release of energy from the inside of the ignition powder and react at a specified position or time. However, common energetic materials have weak microwave absorption and long microwave ignition delay time, which limits the application of microwave ignition.
[0003] Conventional methods to improve microwave ignition of energetic materials mainly include the introduction of carbon nanotubes, GO, rGO, SiC and Ti 3 C 2 Microwave sensitizers such as Mxene are used to enhance microwave radiation absorption, forming hot spots locally for ignition, but these microwave sensitizers significantly reduce the energy of the system and cannot significantly reduce the microwave ignition delay time. At the same time, these inert microwave sensitizers have low energy, which reduces the energy of the energetic material system. Therefore, the development of microwave energetic materials and sensitizers that can participate in the system reaction and do not reduce the system energy is the key to promoting the application of microwave ignition technology. Summary of the invention
[0004] In order to overcome the problem that the microwave sensitizer introduced in the existing microwave ignition energetic material technology does not participate in the reaction, the purpose of the present invention is to provide a titanium / copper ferrite microwave-sensitive energetic material and a preparation method and application. The energetic material has good dispersibility, high reaction system energy, short microwave ignition delay time and good combustion performance.
[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0006] A method for preparing a titanium / copper ferrite microwave-sensitive energetic material comprises the following steps:
[0007] Adding polyvinylidene fluoride-hexafluoropropylene into N,N-dimethylformamide and mixing them evenly to obtain a mixed solution A;
[0008] Adding nano copper ferrite into mixed solution A and mixing evenly to obtain mixed solution B;
[0009] Adding nano titanium powder into mixed solution B and mixing evenly to obtain mixed solution C;
[0010] The mixed solution C is used to prepare titanium / copper ferrite microwave-sensitive energetic material by an electrostatic spray method.
[0011] Furthermore, the amount of polyvinylidene fluoride-hexafluoropropylene is 2-6 wt % of the mass of the microwave sensitive energetic material.
[0012] Furthermore, copper ferrite is prepared by the following process: dissolving ferric chloride in ethylene glycol under ultrasonic conditions to obtain a ferric chloride solution; dissolving cupric chloride in ethylene glycol under ultrasonic conditions to obtain a cupric chloride solution; adding PVP to the ferric chloride solution to obtain a mixed solution, and uniformly mixing the mixed solution with the cupric chloride solution to obtain a mixed solution; adding sodium acetate to the mixed solution, and then performing a solvothermal reaction to obtain nano copper ferrite.
[0013] Furthermore, the particle size of the nano copper ferrite is 100-300 nm; the particle size of the nano titanium powder is 50-200 nm.
[0014] Furthermore, the amount of nano copper ferrite is 16-70wt% of the mass of the microwave-sensitive energetic material.
[0015] Furthermore, the amount of nano titanium powder used is 25-78 wt % of the mass of the microwave sensitive energetic material.
[0016] Furthermore, the total mass of the polyvinylidene fluoride-hexafluoropropylene, the nano-titanium powder and the nano-copper ferrite in each 1 mL of the mixed solution C is 200-500 mg.
[0017] Furthermore, the conditions of the electrostatic spray method are: the voltage used during electrostatic spraying is 10 to 25 kV, the distance between the needle and the receiving plate during electrostatic spraying is 5 to 20 cm, and the flow rate of the peristaltic pump during electrostatic spraying is 0.1 to 1.2 mL·h -1 During electrostatic spraying, the ambient temperature is 10-40°C and the humidity is 10-40%.
[0018] A titanium / copper ferrite microwave-sensitive energetic material prepared according to the preparation method as described above, wherein the particle size of the energetic material is 1 to 10 μm.
[0019] The invention discloses an application of the titanium / copper ferrite microwave-sensitive energetic material as a microwave ignition agent and a microwave sensitizer.
[0020] Furthermore, the microwave ignition delay time of titanium / copper ferrite microwave-sensitive energetic material under the action of 50 W microwave is 40 to 200 ms, the burning rate of loose titanium / copper ferrite microwave ignition powder during laser ignition in air is 0.02 to 0.2 m / s, and the maximum pressure of 25 mg of titanium / copper ferrite microwave-sensitive high-energy material burning in a 13 mL closed exploder is 20 to 150 kPa, and the pressurization rate is 500 to 1500 kPa / s.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] In the present invention, copper ferrite with high magnetocrystalline anisotropy field and high dielectric properties is used as an oxidant, which converts electromagnetic energy into other forms of energy such as heat energy through hysteresis loss and dielectric loss, thereby realizing the absorption of microwaves by the titanium / copper ferrite microwave-sensitive energetic material. 2 The coating enables the nano titanium powder to quickly absorb microwaves. The copper ferrite and metal fuel titanium are compounded to form a microwave-sensitive energetic material, which can significantly absorb microwaves, reduce the microwave ignition delay time, and undergo a violent redox reaction, releasing huge energy; at the same time, when the copper ferrite is used as a sensitizer for other microwave-inert thermites, it can participate in the redox reaction of thermites as an oxidant; the metal oxide composite oxide copper ferrite and metal fuel titanium are tightly compounded by electrostatic spraying, and the spatial structure and particle size are adjusted, which can significantly improve the combustion performance of the microwave-sensitive energetic material. The synthesis method of the present invention is simple, safe, effective, environmentally friendly, and easy to industrialize.
[0023] Furthermore, the copper ferrite prepared by the solvent thermal method in the present invention has uniform particle size distribution, and has the advantages of low cost, simple operation and high yield compared with other methods.
[0024] The titanium / copper ferrite microwave-sensitive energetic material synthesized by the present invention can be used as a microwave ignition agent and a microwave sensitizer. The energetic material has high energy release and good combustion performance, is sensitive to microwaves, and is ignited in a microwave field under an air atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a physical picture of the titanium / copper ferrite microwave-sensitive energetic material prepared by electrostatic spraying in Example 1.
[0026] Figure 2 These are SEM images of the titanium / copper ferrite microwave-sensitive energetic material of Example 1; wherein (a) is a SEM image of copper ferrite; (b) is a SEM image of the titanium / copper ferrite microwave-sensitive energetic material;
[0027] Figure 3Schematic diagram of microwave ignition of titanium / copper ferrite microwave-sensitive energetic materials of Examples 2-3 in an air atmosphere; wherein, (a) is the energetic material of Example 2 burning for 0 ms, (b) is the energetic material of Example 2 burning for 2.13 ms, (c) is the energetic material of Example 2 burning for 7.67 ms, (d) is the energetic material of Example 2 burning for 21.31 ms, (e) is the energetic material of Example 2 burning for 55.39 ms, (f) is the energetic material of Example 3 burning for 0 ms, (g) is the energetic material of Example 3 burning for 2.13 ms, (h) is the energetic material of Example 3 burning for 7.67 ms, (i) is the energetic material of Example 3 burning for 21.31 ms, and (j) is the energetic material of Example 3 burning for 55.39 ms.
[0028] Figure 4 is the microwave ignition delay time of the titanium / copper ferrite microwave sensitive energetic material of Example 1 under a 50W microwave;
[0029] Figure 5 This is the combustion process of the titanium / copper ferrite microwave-sensitive energetic material of Example 4 ignited by a 20 W laser in air. DETAILED DESCRIPTION
[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.
[0031] The method for preparing the titanium / copper ferrite microwave-sensitive energetic material of the present invention comprises the following steps: fully ultrasonically dispersing and stirring each component in a solvent to form a uniform and stable precursor solution, and then preparing the titanium / copper ferrite microwave-sensitive energetic material from the precursor solution by an electrostatic spray method.
[0032] The adhesive polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is added to the solvent N,N-dimethylformamide, and ultrasonically dispersed to obtain a mixed solution A; the amount of PVDF-HFP used is 2-6wt% of the mass of the microwave-sensitive energetic material.
[0033] Copper ferrite is synthesized by a hydrothermal method, and the synthesis steps are as follows: 2.703 g of ferric chloride is dissolved in 35 mL of ethylene glycol under ultrasonic conditions to obtain a ferric chloride solution; 0.852 g of cupric chloride is dissolved in 35 mL of ethylene glycol under ultrasonic conditions to obtain a cupric chloride solution, 1.0 g of PVP is added to a first chloride salt solution to obtain a mixed solution, and then the mixed solution is mixed with the cupric chloride solution and ultrasonically homogenized to obtain a mixed solution; 2.46 g of sodium acetate is added to the mixed solution to obtain a homogenous solution and then transferred to a high-pressure reactor, reacted at 180° C. for 12 hours, and the product is washed and dried to obtain nano copper ferrite with a spinel structure and a particle size of 100 to 300 nm.
[0034] Nano-copper ferrite is added into mixed solution A, and after physical stirring, it is evenly dispersed by ultrasonic for 20 minutes to obtain mixed solution B; the amount of nano-copper ferrite used is 16-70wt% of the mass of the microwave-sensitive energetic material.
[0035] Nano titanium powder with a particle size of 50 to 200 nm is added to mixed solution B, physically stirred evenly, and then ultrasonically dispersed for 1 hour to obtain mixed solution C; the amount of nano titanium powder used is 25 to 78 wt% of the mass of the microwave-sensitive energetic material.
[0036] The mixed solution C is physically stirred for 1 to 30 hours to obtain a mixed solution D; the total mass of PVDF-HFP, nano-titanium powder and nano-copper ferrite in each 1 mL of the mixed solution C is 200 to 500 mg, that is, the solid content in the C solution is 200 to 500 mg·mL -1 .
[0037] The mixed solution D is prepared by an electrostatic spray method to prepare titanium / copper ferrite microwave-sensitive energetic material with a particle size of 1 to 10 μm. Specifically, the conditions of the electrostatic spray method are: the voltage used during electrostatic spraying is 10 to 25 kV, the distance between the needle and the receiving plate during electrostatic spraying is 5 to 20 cm, and the flow rate of the peristaltic pump during electrostatic spraying is 0.1 to 1.2 mL·h -1 During electrostatic spraying, the ambient temperature is 10-40°C and the humidity is 10-40%.
[0038] The titanium / copper ferrite microwave-sensitive high-energy material prepared according to the method described above has good microwave sensitivity and combustion performance, and can be used as a microwave ignition agent and a microwave sensitizer. Specifically, the microwave ignition delay time of the titanium / copper ferrite microwave-sensitive energetic material under the action of a 50W microwave is 40 to 200ms, the burning rate of the loose titanium / copper ferrite microwave ignition agent during laser ignition in air is 0.02 to 0.2m / s, and the maximum pressure of 25mg of the titanium / copper ferrite microwave-sensitive high-energy material burning in a 13mL closed exploder is 20 to 150kPa, and the pressurization rate is 500 to 1500kPa / s.
[0039] Example 1
[0040] 40.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonication to obtain an adhesive solution.
[0041] 380.0 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0042] 380.0 mg of nano titanium powder was weighed and added to the copper ferrite solution. After physical stirring for 15 min, ultrasonic dispersion was performed for 1 h to obtain a composite solution.
[0043] The composite solution was then physically stirred at room temperature for 24 h to obtain a uniform precursor solution.
[0044] The precursor solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 13 kV, the distance between the needle and the receiving plate was 14 cm, and the flow rate of the peristaltic pump was 0.9 mL·h -1 , titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 30°C and humidity of 30%.
[0045] Figure 1 This is a schematic diagram of the electrostatic spray granulation of the titanium / copper ferrite microwave-sensitive energetic material of Example 1. It can be clearly seen that after the precursor liquid is electrostatically sprayed, the energetic material obtained is evenly distributed on the receiving plate.
[0046] Figure 2 (a) is a SEM image of copper ferrite, with a particle size of about 200 nm, a rough surface and regular morphology;
[0047] Figure 2 (b) is a SEM image of the titanium / copper ferrite microwave-sensitive energetic material of Example 1. It can be seen from the image that it is spherical, with a particle size of about 3 μm. Through the action of the adhesive PVDF-HFP, the nano-titanium and copper ferrite are tightly combined. In addition, the particles have a porous structure, which is conducive to the absorption of microwaves.
[0048] Figure 4 It is the ignition delay time of the titanium / copper ferrite microwave-sensitive energetic material of Example 1 measured by a photoelectric sensor under 50W microwave ignition.
[0049] Example 2
[0050] 40.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonication to obtain an adhesive solution.
[0051] 337.78 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0052] 422.22 mg of nano titanium powder was weighed and added to the copper ferrite solution. After physical stirring for 15 min, ultrasonic dispersion was performed for 1 h to obtain a composite solution.
[0053] The composite solution was then physically stirred at room temperature for 24 h to obtain a uniform precursor solution.
[0054] The body solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 12 kV, the distance between the needle and the receiving plate was 14 cm, and the flow rate of the peristaltic pump was 0.9 mL·h -1 , titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 30°C and humidity of 30%.
[0055] Figure 3 (a)-(e) are schematic diagrams of microwave field ignition of titanium / copper ferrite microwave-sensitive energetic material of Example 2 in an air atmosphere. It can be seen that the entire combustion process lasted 74.7 ms, and the maximum flame appeared at 35.1 ms.
[0056] Example 3
[0057] 40.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonication to obtain an adhesive solution.
[0058] 506.58 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0059] 253.42 mg of nano titanium powder was weighed and added to the copper ferrite solution. After physical stirring for 15 min, ultrasonic dispersion was performed for 1 h to obtain a composite solution.
[0060] The composite solution was then physically stirred at room temperature for 24 h to obtain a uniform precursor solution.
[0061] The solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 14 kV, the distance between the needle and the receiving plate was 14 cm, and the flow rate of the peristaltic pump was 0.9 mL·h -1 , titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 30°C and humidity of 30%.
[0062] Figure 3(f)-(j) are schematic diagrams of microwave field ignition of titanium / copper ferrite microwave-sensitive energetic material of Example 3 in air atmosphere. It can be seen that the entire combustion process lasted for 55.4 ms, and the maximum flame appeared at 7.7 ms. The combustion rate of the energetic material before the maximum flame appeared was greater than that of the energetic material of Example 2. However, the energetic material of Example 2 burned more violently than the energetic material of Example 3, and the flame was larger.
[0063] Example 4
[0064] 40.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonication to obtain an adhesive solution.
[0065] 296.58 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0066] 463.42 mg of nano titanium powder was weighed and added to the copper ferrite solution, and after physical stirring for 15 minutes, ultrasonic dispersion was performed for 1 hour to obtain a composite solution. The composite solution was then physically stirred at room temperature for 24 hours to obtain a uniform precursor solution.
[0067] The precursor solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 13 kV, the distance between the needle and the receiving plate was 14 cm, and the flow rate of the peristaltic pump was 0.9 mL·h -1 , titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 30°C and humidity of 30%.
[0068] Figure 5 The combustion rate of the titanium / copper ferrite microwave-sensitive energetic material of Example 4 during laser ignition in an air atmosphere is 0.071 m / s.
[0069] Example 5
[0070] 30.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution.
[0071] 360 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0072] 360 mg of nano titanium powder was weighed and added to the copper ferrite solution, and after physical stirring for 15 minutes, ultrasonic dispersion was performed for 1 hour to obtain a composite solution. The composite solution was then physically stirred at room temperature for 24 hours to obtain a uniform precursor solution.
[0073] The precursor solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 12 kV, the distance between the needle and the receiving plate was 11 cm, and the flow rate of the peristaltic pump was 0.8 mL·h -1 , under the conditions of ambient temperature of 25°C and humidity of 25%, titanium / copper ferrite microwave-sensitive energetic material was prepared.
[0074] Example 6
[0075] 30.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution.
[0076] 320 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0077] 400 mg of nano titanium powder was weighed and added to the copper ferrite solution, and after physical stirring for 15 minutes, ultrasonic dispersion was performed for 1 hour to obtain a composite solution. The composite solution was then physically stirred at room temperature for 24 hours to obtain a uniform precursor solution.
[0078] The precursor solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 14 kV, the distance between the needle and the receiving plate was 13 cm, and the flow rate of the peristaltic pump was 0.9 mL·h -1 , under the conditions of ambient temperature of 25°C and humidity of 25%, titanium / copper ferrite microwave-sensitive energetic material was prepared.
[0079] Example 7
[0080] 30.0 mg of PVDF-HFP was dispersed in 2 mL of N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution.
[0081] 280.98 mg of nano copper ferrite was weighed and dissolved in the adhesive solution, and a uniform copper ferrite solution was obtained after physical stirring and ultrasonic dispersion for 20 minutes.
[0082] 439.02 mg of nano titanium powder was weighed and added to the copper ferrite solution, and after physical stirring for 15 min, ultrasonic dispersion was performed for 1 h to obtain a composite solution. The composite solution was then physically stirred at room temperature for 24 h to obtain a uniform precursor solution.
[0083] The precursor solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 15 kV, the distance between the needle and the receiving plate was 11 cm, and the flow rate of the peristaltic pump was 0.8 mL·h -1 , under the conditions of ambient temperature of 25°C and humidity of 25%, titanium / copper ferrite microwave-sensitive energetic material was prepared.
[0084] Example 8
[0085] 40.0 mg PVDF-HFP was dispersed in 2 mL N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution. The amount of PVDF-HFP used was 2 wt% of the mass of the microwave-sensitive energetic material;
[0086] Dissolve the nano copper ferrite in the adhesive solution, and obtain a uniform copper ferrite solution after physical stirring and ultrasonic dispersion for 20 minutes. The amount of nano copper ferrite is 70wt% of the mass of the microwave-sensitive energetic material;
[0087] The nano titanium powder was added to the copper ferrite solution, physically stirred for 15 minutes, and then ultrasonically dispersed for 1 hour to obtain a composite solution. The amount of the nano titanium powder was 28 wt% of the mass of the microwave sensitive energetic material.
[0088] The composite solution was then physically stirred at room temperature for 1 h to obtain a uniform precursor solution. The total mass of PVDF-HFP, nano-titanium powder and nano-copper ferrite in each 1 mL of the precursor solution was 200 mg;
[0089] The body solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 1 kV, the distance between the needle and the receiving plate was 25 cm, and the flow rate of the peristaltic pump was 0.1 mL·h -1 Titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 10°C and humidity of 40%.
[0090] Example 9
[0091] 40.0 mg PVDF-HFP was dispersed in 2 mL N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution. The amount of PVDF-HFP used was 3 wt% of the mass of the microwave-sensitive energetic material;
[0092] Dissolve the nano copper ferrite in the adhesive solution, and obtain a uniform copper ferrite solution after physical stirring and ultrasonic dispersion for 20 minutes. The amount of nano copper ferrite is 57wt% of the mass of the microwave-sensitive energetic material;
[0093] The nano titanium powder is added to the copper ferrite solution, physically stirred for 15 minutes, and then ultrasonically dispersed for 1 hour to obtain a composite solution. The amount of the nano titanium powder is 40 wt% of the mass of the microwave sensitive energetic material.
[0094] The composite solution was then physically stirred at room temperature for 10 h to obtain a uniform precursor solution. The total mass of PVDF-HFP, nano-titanium powder and nano-copper ferrite in each 1 mL of the precursor solution was 300 mg;
[0095] The body solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 20 kV, the distance between the needle and the receiving plate was 20 cm, and the flow rate of the peristaltic pump was 0.5 mL·h -1, titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 40°C and humidity of 30%.
[0096] Example 10
[0097] 40.0 mg PVDF-HFP was dispersed in 2 mL N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution. The amount of PVDF-HFP used was 5 wt% of the mass of the microwave-sensitive energetic material;
[0098] Dissolve the nano copper ferrite in the adhesive solution, and obtain a uniform copper ferrite solution after physical stirring and ultrasonic dispersion for 20 minutes. The amount of nano copper ferrite is 70wt% of the mass of the microwave-sensitive energetic material;
[0099] The nano titanium powder is added to the copper ferrite solution, physically stirred for 15 minutes, and then ultrasonically dispersed for 1 hour to obtain a composite solution. The amount of the nano titanium powder is 25wt% of the mass of the microwave-sensitive energetic material.
[0100] The composite solution was then physically stirred at room temperature for 20 h to obtain a uniform precursor solution. The total mass of PVDF-HFP, nano-titanium powder and nano-copper ferrite in each 1 mL of the precursor solution was 400 mg;
[0101] The body solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 10 kV, the distance between the needle and the receiving plate was 8 cm, and the flow rate of the peristaltic pump was 1 mL·h -1 , under the conditions of ambient temperature of 20°C and humidity of 20%, titanium / copper ferrite microwave-sensitive energetic material was prepared.
[0102] Embodiment 11
[0103] 40.0 mg PVDF-HFP was dispersed in 2 mL N,N-dimethylformamide solution by ultrasonic homogenization to obtain an adhesive solution. The amount of PVDF-HFP used was 6 wt% of the mass of the microwave-sensitive energetic material;
[0104] Dissolve the nano copper ferrite in the adhesive solution, and obtain a uniform copper ferrite solution after physical stirring and ultrasonic dispersion for 20 minutes. The amount of nano copper ferrite is 16wt% of the mass of the microwave-sensitive energetic material;
[0105] The nano titanium powder is added to the copper ferrite solution, physically stirred for 15 minutes, and then ultrasonically dispersed for 1 hour to obtain a composite solution. The amount of the nano titanium powder is 78 wt% of the mass of the microwave-sensitive energetic material.
[0106] The composite solution was then physically stirred at room temperature for 30 h to obtain a uniform precursor solution. The total mass of PVDF-HFP, nano-titanium powder and nano-copper ferrite in each 1 mL of the precursor solution was 500 mg;
[0107] The solution was sprayed by electrostatic spray technology. The voltage of electrostatic spray was 18 kV, the distance between the needle and the receiving plate was 17 cm, and the flow rate of the peristaltic pump was 1.2 mL·h -1 Titanium / copper ferrite microwave-sensitive energetic material was prepared under the conditions of ambient temperature of 35°C and humidity of 10%.
[0108] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. However, all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.
[0109] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
Claims
1. A method for preparing a titanium / copper ferrite microwave-sensitive energetic material, characterized in that: The following steps are involved: Adding polyvinylidene fluoride-hexafluoropropylene into N,N-dimethylformamide and mixing them evenly to obtain a mixed solution A; Adding nano copper ferrite into mixed solution A and mixing evenly to obtain mixed solution B; Adding nano titanium powder into mixed solution B and mixing evenly to obtain mixed solution C; The mixed solution C is used to prepare titanium / copper ferrite microwave-sensitive energetic material by electrostatic spraying method; Nano copper ferrite is prepared by the following process: dissolving ferric chloride in ethylene glycol under ultrasonic conditions to obtain a ferric chloride solution; dissolving cupric chloride in ethylene glycol under ultrasonic conditions to obtain a cupric chloride solution; adding PVP to the ferric chloride solution to obtain a mixed solution, and uniformly mixing the mixed solution with the cupric chloride solution to obtain a mixed solution; adding sodium acetate to the mixed solution, and then performing a solvothermal reaction to obtain nano copper ferrite.
2. The method for preparing the titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The amount of polyvinylidene fluoride-hexafluoropropylene used is 2-6wt% of the mass of the microwave sensitive energetic material.
3. The method for preparing the titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The particle size of nano copper ferrite is 100-300nm; the particle size of nano titanium powder is 50-200nm.
4. The method for preparing titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The dosage of the nano copper ferrite is 16-70wt% of the mass of the microwave sensitive energetic material.
5. The method for preparing the titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The dosage of the nano titanium powder is 25-78wt% of the mass of the microwave sensitive energetic material.
6. The method for preparing the titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The total mass of polyvinylidene fluoride-hexafluoropropylene, nano titanium powder and nano copper ferrite in each 1 mL of mixed solution C is 200-500 mg.
7. The method for preparing the titanium / copper ferrite microwave-sensitive energetic material according to claim 1, characterized in that: The conditions of the electrostatic spray method are: the voltage used during electrostatic spray is 10-25 kV, the distance between the needle and the receiving plate during electrostatic spray is 5-20 cm, and the peristaltic pump flow rate during electrostatic spray is 0.1-1.2 mL·h -1 During electrostatic spraying, the ambient temperature is 10-40°C and the humidity is 10-40%.
8. A titanium / copper ferrite microwave-sensitive energetic material prepared according to the preparation method according to any one of claims 1 to 7, characterized in that: The particle size of the energetic material is 1 to 10 μm.
9. Use of the titanium / copper ferrite microwave-sensitive energetic material as claimed in claim 8 as a microwave ignition agent and a microwave sensitizer.