Preparation method of bimetallic anti-aging metastable intermolecular compound film

Abstract

The invention relates to a method for preparing a bimetallic anti-aging metastable intermolecular compound film based on electrostatic spinning. Comprising the following steps: (1) preparing a polyvinylidene fluoride polymer dispersion liquid; (2) respectively adding nano aluminum and micron nickel into the polyvinylidene fluoride polymer dispersion liquid, dispersing and mixing to obtain a bimetallic mixed precursor liquid; (3) adding nano copper oxide into the bimetallic mixed precursor solution, and mixing to form a bimetallic metastable intermolecular compound polyvinylidene fluoride precursor solution; and (4) carrying out electrostatic spinning on the precursor solution to obtain the bimetallic anti-aging metastable intermolecular compound film. According to the method, while the dispersity of the bimetal metastable intermolecular compound is effectively improved, the bimetal metastable intermolecular compound can be uniformly loaded on the polyvinylidene fluoride fiber to form an energetic composite film, and the energetic composite film has good anti-aging performance; under the condition that the sample is pollution-free and safe, the whole preparation process is simple, the consumed time is short, and the equipment operation difficulty is low.

Description

Technical Field

[0001] This invention belongs to the field of energetic materials, specifically relating to a method for preparing a bimetallic anti-aging metastable intermolecular composite film. Background Technology

[0002] With the rapid development of nanochemistry and nanotechnology, various materials and oxides have been prepared at the nanoscale, including metastable intermolecular complexes. Metastable intermolecular complexes are a class of energetic materials composed of nano-metal / metal or metal / metal oxide composites. Due to their nanoscale heat and mass transfer, they are also known as nano-thermite. Compared to traditional thermite, metastable intermolecular complexes have advantages such as high energy density, high reactivity, and low ignition temperature.

[0003] Energetic materials (mainly including pyrotechnic agents, gunpowder, explosives, and pyrotechnics) are subjected to environmental factors such as temperature and humidity stress during long-term storage, leading to changes in their structure and properties, resulting in performance degradation or even deactivation. This directly affects the reliability, safety, and service life of equipment systems. Currently, research on accelerated aging at home and abroad mainly focuses on energetic materials such as gunpowder, explosives, pyrotechnics, and propellants. However, there is very limited research on aging tests, aging mechanisms, and anti-aging measures for metastable intermolecular complexes, which are increasingly widely used. Furthermore, there are very few methods for preparing metastable intermolecular complex films.

[0004] There are many methods for preparing metastable intermolecular composite films, including magnetron sputtering, electrophoretic deposition, electrospinning, 3D printing, and spin coating. Among these, electrospinning (ES) is commonly used due to its advantages such as good safety, simple preparation process, and ability to directly produce macroscopic films. The principle of electrospinning technology is as follows: the precursor liquid (fuel / oxidant / binder) of the metastable intermolecular composite overcomes surface tension under the action of a high-strength electric field and splits into smaller droplets or jets. During the flight of the droplets in the electric field, the solvent gradually evaporates, and the solute precipitates on the substrate, eventually stacking into a fibrous film. Commonly used binders include nitrocellulose (NC), polyvinylidene fluoride (PVDF), polyurethane (PU), and azide-deoxycellulose nitrate (ACN). Polyvinylidene fluoride is a suitable binder due to its excellent hydrophobicity, oxidation resistance, and thermal stability. Electrospinning can control the sample to have a core-shell structure or be loaded onto the fiber surface, thereby changing the sample's microstructure.

[0005] Currently, there are two main approaches to anti-aging of metastable intermolecular complex films. The first is fuel modification, commonly achieved by forming a hydrophobic coating on the fuel particle surface through physical adsorption or chemical bonding (CN202411119784.X). This blocks or reduces the erosion of fuel by moisture during aging and retains the active fuel components that support the reaction, thus achieving an anti-aging effect. The second approach involves constructing bimetallic metastable intermolecular complex systems. This is achieved by adding other metals to introduce new chemical reactions into the system or by extending the storage life of the metastable intermolecular complex through interparticle physical interactions. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing a bimetallic anti-aging metastable intermolecular composite film.

[0007] The technical solution to achieve the objective of this invention is: a method for preparing bimetallic anti-aging metastable intermolecular composite films based on electrospinning, comprising the following steps:

[0008] Step (1): Prepare polyvinylidene fluoride polymer dispersion;

[0009] Step (2): Add nano-aluminum powder and micron-sized nickel powder to the polyvinylidene fluoride polymer dispersion prepared in step (1), disperse them separately, and then mix and stir to obtain a nano-aluminum-micron-sized nickel bimetallic mixed precursor solution; the mass ratio of micron-sized nickel powder to nano-aluminum powder is between 0.05 and 0.2.

[0010] Step (3): Add nano copper oxide to the nano aluminum-micro nickel bimetallic mixed precursor solution prepared in step (2), and stir to form a bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution.

[0011] Step (4): Using the bimetallic metastable intermolecular complex polyvinylidene fluoride precursor liquid obtained in step (3), a bimetallic anti-aging metastable intermolecular complex film is prepared by electrospinning device. The bimetallic anti-aging metastable intermolecular complex film has a microstructure of "embedded load fiber".

[0012] Further, step (1) specifically involves: weighing polyvinylidene fluoride (PVDF) and adding it to an organic solvent; stirring in a thermostatic magnetic stirrer at 50-55 ℃ and 900-1200 rpm for 0.5-1.0 h until the PVDF is completely dissolved, thus obtaining a polyvinylidene fluoride polymer dispersion; the mass fraction of polyvinylidene fluoride in the organic solvent is 0.1-0.2 g·mL. -1 .

[0013] Further, step (2) specifically involves adding nano-aluminum powder to the polyvinylidene fluoride polymer dispersion prepared in step (1) and performing ultrasonic dispersion; then adding micron-sized nickel powder and performing ultrasonic dispersion again, followed by stirring to obtain a nano-aluminum-micron-nickel bimetallic mixed precursor solution.

[0014] Furthermore, in step (2), the particle size of the nano-aluminum powder is 100-200 nm; the particle size of the micron-sized nickel powder is 5-15 µm.

[0015] The process parameters for ultrasonic dispersion in step (2) are as follows: ultrasonic dispersion at 500 W and 30-50 kHz for 0.5-1.0 h, and ultrasonic dispersion at 500 W and 30-50 kHz for 1.0-1.5 h.

[0016] The mixing process is as follows: place the mixture in a magnetic stirrer and stir at 700~900 rpm for 0.5-2 hours.

[0017] Further, step (3) specifically involves: adding nano-copper oxide to a nano-aluminum-micron nickel bimetallic mixed precursor solution, ultrasonically dispersing it at 500 W and 30-50 kHz for 0.5-1.5 h, and then stirring it on a magnetic stirrer at a stirring speed of 700-900 rpm for 24-48 h to form a bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution.

[0018] Furthermore, the aluminum to copper oxide equivalent ratio in the bimetallic metastable intermolecular complex is 1.4-2.0; the mass of polyvinylidene fluoride in the polyvinylidene fluoride precursor solution of the bimetallic metastable intermolecular complex accounts for 25%-30% of the total mass.

[0019] Furthermore, the electrospinning device used in step (4) includes a pusher (2), a syringe (1), a high-voltage power supply (3), an aluminum foil substrate roller (4), and a platform (5).

[0020] The bimetallic metastable intermolecular complex polyvinylidene fluoride precursor liquid is drawn out with a syringe (1) and placed on the pusher (2). The aluminum foil base roller (4) is connected to a negative high voltage. A positive high voltage is applied to the needle of the syringe using a high voltage power supply (3). The pusher (2), aluminum foil base roller (4), and platform (5) are turned on. The dispersion liquid in the syringe (1) moves in the high voltage electrostatic field and is uniformly deposited on the conductive aluminum foil base roller (4).

[0021] Furthermore, in step (4), the propeller speed is 0.020-0.030 mL / min; the platform moving speed is 130-170 mm / min; the platform moving displacement is 20-50 mm; the distance between the needle tip and the aluminum foil substrate roller is 4-6 cm; the roller rotation speed is 800-1000 rpm; the roller rotation direction is clockwise; the voltage applied to the needle tip is 13-15 kV; the ambient temperature is set to 25-28℃; the humidity is set to 45%-60% RH; and the syringe needle specification is 21G.

[0022] A bimetallic anti-aging metastable intermolecular composite film was prepared using the method described above.

[0023] Furthermore, the bimetallic anti-aging metastable intermolecular complex film uses polyvinylidene fluoride fiber as a supporting framework. The film consists of a single fiber forming a monolayer. The metastable intermolecular complex is adsorbed on the fiber surface and aggregates into unit energy release elements. The monolayer films are stacked to form a composite film, while micron-sized nickel is embedded between the layers of the composite film and adsorbs the metastable intermolecular complex to form new energy release elements.

[0024] Compared with the prior art, the significant advantages of this invention are:

[0025] (1) The anti-aging properties of bimetallic anti-aging metastable intermolecular composite films are significantly better than those of metastable intermolecular composite films. After adding micron-sized nickel, Ni reacts with CuO, releasing heat. This reaction occurs before the aluminothermic reaction and can provide energy for the firing of the aluminothermic reaction. In addition, due to the difference in particle size between Ni and Al, Al can be adsorbed on the surface of Ni, and this adsorption effect will intensify with the increase of aging time. Ni and Al will undergo an intermetallic reaction. The heat released by this reaction will cause the Al2O3 shell on the Al surface, which is cracked due to the reaction with PVDF, to break, releasing active Al, thereby ensuring that the bimetallic anti-aging metastable intermolecular composite film can still fire normally after aging. The reaction between Ni and Al will also increase the heat release of the system, improve the combustion performance of the composite film, and increase the combustion pressure of the metastable intermolecular composite film.

[0026] (2) This method can improve the dispersibility of metastable intermolecular complexes and enable them to be uniformly loaded onto the polyvinylidene fluoride fiber skeleton to form a "loaded fiber" structure. The fibers constitute a single-layer film, which is then stacked to form a composite film. Due to the difference in particle size, micron-sized nickel is embedded between the layers of the film, resulting in the microstructure of "embedded loaded fibers". The Ni surface will also adsorb metastable intermolecular complexes, providing a target for the release of active Al from the Al2O3 shell during the main reaction stage.

[0027] (3) This method is based on electrospinning technology. Polyvinylidene fluoride is dissolved in an organic solvent, and nano-aluminum, micron-sized nickel and nano-copper oxide are added and mixed to prepare an electrospinning precursor solution. The skeleton of the energetic film is constructed by utilizing the characteristics that polyvinylidene fluoride will form fibers during electrospinning and that the organic solvent will evaporate completely during electrospinning at a set temperature. At the same time, because the metastable intermolecular complex is uniformly suspended in the polyvinylidene fluoride organic solution, the metastable intermolecular complex particles can adhere to the polyvinylidene fluoride fibers during electrospinning, and finally a bimetallic anti-aging metastable intermolecular complex film is obtained.

[0028] (4) Sample preparation is simple and easy, and the device is safe and easy to operate. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the electrospinning device.

[0030] Figure 2 The SEM characterization results of the bimetallic anti-aging metastable intermolecular composite film prepared in Example 1 are shown; where (a) is 2500× and (b) is 50000×.

[0031] Figure 3 The characterization results are for the cross-section of the bimetallic anti-aging metastable intermolecular composite film prepared in Example 1.

[0032] Figure 4 The results of TG-DSC testing are shown for the bimetallic anti-aging metastable intermolecular composite film prepared in Example 1; where (a) is the DSC result and (b) is the TG result.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Injector, 2-Propeller, 3-High voltage power supply, 4-Aluminum foil substrate roller, 5-Platform, 6-Electrospinning precursor solution, 7-Electrospinning product. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Combination Figure 1 , 23, 4, A method for preparing a bimetallic anti-aging metastable intermolecular composite film, firstly, a polyvinylidene fluoride (PVDF) dispersion is prepared; then, nano-aluminum and micron-sized nickel are weighed and added to the PVDF polymer dispersion, and ultrasonically dispersed to prepare a nano-aluminum-micron-sized nickel mixed precursor solution; then, nano-copper oxide is weighed and added to the bimetallic mixed precursor solution, first ultrasonicated, and then stirred to obtain a uniformly distributed bimetallic metastable intermolecular composite PVDF precursor solution; finally, the precursor solution is drawn into a syringe and placed on a platform for electrospinning, and the propulsion rate of the pusher 2, the positive and negative voltages of the high-voltage power supply 3, the rotation speed of the aluminum foil substrate roller 4, the displacement speed and displacement distance of the platform 5, and the distance between the needle of the syringe 1 and the aluminum foil substrate roller 4 are set for electrospinning.

[0037] Example 1

[0038] Weigh 420 mg of polyvinylidene fluoride and add it to 4.2 ml of dimethylformamide (DMF) solvent. Then place it in a thermostatic magnetic stirrer, adjust the temperature to 55 ℃ and the speed to 40%, and heat and stir for 0.5 h until the polyvinylidene fluoride is completely dissolved to form a transparent polymer dispersion with a certain viscosity.

[0039] Weigh 319.22 mg of nano-aluminum and add it to the polyvinylidene fluoride polymer dispersion.

[0040] Ultrasonic dispersion at 500 W and 40 kHz for 0.5 h disperses large particles and reduces agglomeration.

[0041] Then, 31.92 mg of micron-sized nickel was weighed and added to the polyvinylidene fluoride polymer dispersion.

[0042] Ultrasonic dispersion at 500 W and 40 kHz for 1.0 h ensured that nano-aluminum and micron-sized nickel were fully dispersed and mixed.

[0043] Then place it on a magnetic stirrer and stir at 700 rpm for 0.5 h.

[0044] Weigh 788.05 mg of nano-copper oxide and add it to the polyvinylidene fluoride polymer dispersion.

[0045] Ultrasonic dispersion at 500 W and 40 kHz for 1.0 h,

[0046] The mixture was then placed on a magnetic stirrer and stirred at 800 rpm for 48 h to obtain a bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution.

[0047] The bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution was drawn using a 2.5 mL syringe and placed in an electrospinning apparatus.

[0048] The propulsion rate of the thruster 2 was set to 0.020 mL / min, the moving distance of the platform 5 was 30 mm, and the moving speed was 150 mm / min. The rotation speed of the aluminum foil base roller 4 was 900 rpm, and the rotation direction was clockwise. The positive high voltage of the high voltage power supply 3 was +7 kV, and the negative high voltage was -7 kV. The needle of the syringe 1 was connected to the positive high voltage, and the aluminum foil base roller 4 was connected to the negative high voltage. The distance between the needle of the syringe 1 and the aluminum foil base roller 4 was 4 cm. The ambient temperature was set to 26 ℃, and the humidity was set to 45% RH.

[0049] After setting the parameters for the electrospinning process, connect the high-voltage power supply. Once the actual voltage reaches the set value, run the electrospinning equipment and begin electrospinning.

[0050] After electrospinning is completed, the high-voltage power supply is turned off, the aluminum foil is removed from the roller surface, and the spun product is peeled off from the aluminum foil surface to obtain a bimetallic anti-aging metastable intermolecular composite film.

[0051] The product was characterized, and its SEM test results are as follows: Figure 2 As shown. From Figure 2 It can be seen that the bimetallic anti-aging metastable intermolecular complex film is a fiber-loaded structure, that is, the bimetallic metastable intermolecular complex is uniformly loaded on the fiber.

[0052] The product was characterized, and the SEM results of the cross-section of the bimetallic anti-aging metastable intermolecular composite film are as follows: Figure 3 As shown. From Figure 3 As can be seen, the thickness of the composite film is 181.8 µm. The EDS results show that micron-sized nickel has a significant adsorption effect on nano-aluminum and nano-copper oxide.

[0053] Bimetallic anti-aging metastable intermolecular complex films were accelerated aged at 71 °C and 60% RH, and nichrome wire open ignition was performed at 10 V and 5 A to compare the combustion rate of metastable intermolecular complex films without added micron-sized nickel.

[0054] Comparative example:

[0055] Metastable intermolecular complex films without the addition of micron-sized nickel were used as a control group, and their preparation process is as follows:

[0056] Weigh 420 mg of polyvinylidene fluoride and add it to 4.2 ml of dimethylformamide solvent. Then place it in a thermostatic magnetic stirrer, adjust the temperature to 55 ℃ and the speed to 40%, and heat and stir for 0.5 h until the polyvinylidene fluoride is completely dissolved to form a transparent polymer dispersion with a certain viscosity.

[0057] Weigh 319.22 mg of nano-aluminum and add it to the polyvinylidene fluoride polymer dispersion.

[0058] Ultrasonic dispersion at 500 W and 40 kHz for 0.5 h disperses large particles and reduces agglomeration.

[0059] Weigh 788.05 mg of nano-copper oxide and add it to the polyvinylidene fluoride polymer dispersion.

[0060] Ultrasonic dispersion at 500 W and 40 kHz for 1.0 h,

[0061] The mixture was then placed on a magnetic stirrer and stirred at 800 rpm for 24 h to obtain a metastable intermolecular complex polyvinylidene fluoride precursor solution.

[0062] The precursor solution was drawn using a 2.5 mL syringe of the same specifications as in Example 1 and placed in an electrospinning apparatus. The propulsion rate of the pusher 2 was set to 0.020 mL / min, the moving distance of the platform 5 was 30 mm, and the moving speed was 150 mm / min. The rotation speed of the aluminum foil substrate roller 4 was 900 rpm, and the rotation direction was clockwise. The positive high voltage of the high voltage power supply 3 was +7 kV, and the negative high voltage was -7 kV. The needle of the syringe 1 was connected to the positive high voltage, and the aluminum foil substrate roller 4 was connected to the negative high voltage. The distance between the needle of the syringe 1 and the aluminum foil substrate roller 4 was 4 cm. The ambient temperature was set to 26 ℃, and the humidity was set to 45% RH.

[0063] After setting the parameters for the electrospinning process, connect the high-voltage power supply. Once the actual voltage reaches the set value, run the electrospinning equipment and begin electrospinning.

[0064] After electrospinning, the high-voltage power supply is turned off, the aluminum foil is removed from the roller surface, and the spun product is peeled off from the aluminum foil surface to obtain a metastable intermolecular composite film.

[0065] The test results are shown in Table 1:

[0066] Table 1: Combustion rates of metastable intermolecular complex films before and after the addition of micron-sized nickel

[0067] Aging time Burning rate of metastable intermolecular complex films without added micron-sized nickel Burning rate of bimetallic anti-aging metastable intermolecular complex films 0 h (26.52 ± 0.31) cm / s (36.49 ± 0.74) cm / s 24 h Unable to get angry (28.34 ± 0.48) cm / s

[0068] TG-DSC tests were performed on bimetallic anti-aging metastable intermolecular complex films before and after accelerated aging to compare their heat release.

[0069] The test results are as follows: Figure 4 As shown in Table 2:

[0070] Table 2: Heat release and weight loss of metastable intermolecular complex films before and after the addition of micron-sized nickel

[0071] Aging time Exothermic reaction of metastable intermolecular complex films without added micron-sized nickel Exothermic reaction of bimetallic anti-aging metastable intermolecular complex films Weight loss of metastable intermolecular complex films without added micron-sized nickel Weight loss of bimetallic anti-aging metastable intermolecular composite films 0 h 3957.2 J / g 4177.7 J / g 20.59% 29.84% 24 h 1229.3 J / g 2826.3 J / g 27.79% 10.50%

[0072] It can be seen that the metastable intermolecular complex film without added micron-sized nickel could not undergo self-propagating combustion after 24 hours of aging, while the bimetallic anti-aging metastable intermolecular complex film could still achieve stable ignition after 24 hours of aging, with its burning rate decreasing by only 22%. The metastable intermolecular complex film could not detect the main reaction exothermic peak after 24 hours of aging, indicating complete deactivation, and its total exothermic effect was also significantly reduced. In contrast, the bimetallic anti-aging metastable intermolecular complex film could achieve an exothermic effect of 4177.7 J / g, and its exothermic effect decreased by 32% after 24 hours of aging, demonstrating excellent anti-aging performance.

Claims

1. A method for preparing bimetallic anti-aging metastable intermolecular composite films based on electrospinning, characterized in that, Includes the following steps: Step (1): Prepare polyvinylidene fluoride polymer dispersion; Step (2): Add nano-aluminum powder and micron-sized nickel powder to the polyvinylidene fluoride polymer dispersion prepared in step (1), disperse them separately, and then mix and stir to obtain a nano-aluminum-micron-sized nickel bimetallic mixed precursor solution; the mass ratio of micron-sized nickel powder to nano-aluminum powder is between 0.05 and 0.

2. Step (3): Add nano copper oxide to the nano aluminum-micro nickel bimetallic mixed precursor solution prepared in step (2), and stir to form a bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution. Step (4): Using the bimetallic metastable intermolecular complex polyvinylidene fluoride precursor liquid obtained in step (3), a bimetallic anti-aging metastable intermolecular complex film is prepared by electrospinning device. The bimetallic anti-aging metastable intermolecular complex film has a microstructure of "embedded load fiber".

2. The method according to claim 1, characterized in that, Step (1) specifically involves: weighing polyvinylidene fluoride (PVDF) and adding it to an organic solvent. The mixture is then stirred in a thermostatic magnetic stirrer at 50-55 ℃ and 900-1200 rpm for 0.5-1.0 h until the PVDF is completely dissolved, yielding a polyvinylidene fluoride polymer dispersion. The mass fraction of PVDF in the organic solvent is 0.1-0.2 g·mL. -1 .

3. The method according to claim 2, characterized in that, Step (2) specifically involves adding nano-aluminum powder to the polyvinylidene fluoride polymer dispersion prepared in step (1) and performing ultrasonic dispersion; then adding micron-sized nickel powder and performing ultrasonic dispersion again, followed by stirring to obtain a nano-aluminum-micron-sized nickel bimetallic mixed precursor solution.

4. The method according to claim 3, characterized in that, In step (2), the particle size of the nano-aluminum powder is 100-200 nm; the particle size of the micron-sized nickel powder is 5-15 µm. The process parameters for ultrasonic dispersion in step (2) are as follows: ultrasonic dispersion at 500 W and 30-50 kHz for 0.5-1.0 h, and ultrasonic dispersion at 500 W and 30-50 kHz for 1.0-1.5 h. The mixing process is as follows: place the mixture in a magnetic stirrer and stir at 700~900 rpm for 0.5-2 hours.

5. The method according to claim 4, characterized in that, Step (3) is as follows: add nano-copper oxide to nano-aluminum-micron nickel bimetallic mixed precursor solution, sonicate at 500 W and 30-50 kHz for 0.5-1.5 h for ultrasonic dispersion, place on a magnetic stirrer and stir at 700-900 rpm for 24-48 h to form a bimetallic metastable intermolecular complex polyvinylidene fluoride precursor solution.

6. The method according to claim 5, characterized in that, The aluminum to copper oxide equivalent ratio in the bimetallic metastable intermolecular complex is 1.4-2.0; the mass of polyvinylidene fluoride in the polyvinylidene fluoride precursor solution of the bimetallic metastable intermolecular complex accounts for 25%-30% of the total mass.

7. The method according to claim 6, characterized in that, The electrospinning device used in step (4) includes a pusher (2), a syringe (1), a high-voltage power supply (3), an aluminum foil substrate roller (4), and a platform (5). The bimetallic metastable intermolecular complex polyvinylidene fluoride precursor liquid is drawn out with a syringe (1) and placed on the pusher (2). The aluminum foil base roller (4) is connected to a negative high voltage. A positive high voltage is applied to the needle of the syringe using a high voltage power supply (3). The pusher (2), aluminum foil base roller (4), and platform (5) are turned on. The dispersion liquid in the syringe (1) moves in the high voltage electrostatic field and is uniformly deposited on the conductive aluminum foil base roller (4).

8. The method according to claim 7, characterized in that, In step (4), the propulsion speed is 0.020-0.030 mL / min; the platform moving speed is 130-170 mm / min; the platform moving displacement is 20-50 mm; the distance between the needle tip and the aluminum foil substrate roller is 4-6 cm; the roller rotation speed is 800-1000 rpm; the roller rotation direction is clockwise; the voltage applied to the needle tip is 13-15 kV; the ambient temperature is set to 25-28 ℃; the humidity is set to 45%-60% RH; and the syringe needle specification is 21G.

9. A bimetallic anti-aging metastable intermolecular composite film, characterized in that, Prepared using the method described in any one of claims 1-8.

10. The bimetallic anti-aging metastable intermolecular composite film according to claim 9, characterized in that, The composite film uses polyvinylidene fluoride fiber as a supporting framework. The single fiber forms a single layer film, and metastable intermolecular complexes are adsorbed on the fiber surface and aggregate into unit energy release elements. The single layers are stacked to form a composite film, while micron-sized nickel is embedded between the layers of the composite film and adsorbs metastable intermolecular complexes to form new energy release elements.

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