Composite adhesive based on air cannon filling

Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a composite adhesive based on air cannon filling. According to the graphene-based binder provided by the invention, through the synergistic effect of the modified graphene, the moisture-cured polyurethane and other functional material mixtures, the graphene-based binder is based on air vortex gun launching and is combined with high-speed vortex ring dynamics, electromagnetism, classical contact mechanics and application optics; the multi-modal precise strike (circuit short circuit, mechanical adhesion and visual shielding) of unmanned aerial vehicles (IP5X / IP6X) with different dustproof grades is realized, the blank of the prior art is effectively filled, and an innovative solution is provided for defense of the unmanned aerial vehicles in a complex environment.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to a composite adhesive based on air cannon loading. Background Technology

[0002] With the rapid iteration of drone technology, its applications in fields such as agricultural monitoring, military reconnaissance, and logistics transportation are growing exponentially. However, the illegal intrusion and misuse of drones have posed a significant threat to airspace security, privacy protection, and critical infrastructure. Existing drone defense technologies mainly include electromagnetic spectrum interference, directed energy weapons, and kinetic energy interception, but they have significant limitations in terms of technological adaptability, environmental compatibility, and functional diversity, specifically in the following aspects: Electromagnetic interference, which disrupts the communication link between the UAV and the control unit by emitting 2.4GHz / 5.8GHz radio frequency signals, is ineffective against models with autonomous navigation (such as SLAM algorithms) or frequency hopping anti-jamming capabilities; Directed energy weapons: While high-energy lasers can destroy the UAV structure through thermal ablation, their power density requirements are extremely high (≥10kW / m²). 2 Furthermore, atmospheric attenuation effects (such as rain and fog scattering, thermal halo effects) narrow the effective range to less than 1km; kinetic energy interception: shotguns, capture nets, etc. rely on physical collision to achieve damage, but have short effective range (<50m), narrow coverage (horizontal dispersion angle <10°) and risk of collateral damage. This type of strike has a short range, small effective area, and long continuous strike cycle.

[0003] In summary, existing drone defense technologies suffer from core defects such as insufficient penetration capability against high-protection targets, low swarm interception efficiency, poor environmental compatibility, and limited functionality. Summary of the Invention

[0004] The purpose of this invention is to provide a graphene-based binder, its preparation method, and its application. The graphene-based binder provided by this invention is used for drone defense and can achieve multimodal precision strikes against drones.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a graphene-based adhesive comprising the following components in parts by weight: 100 parts of moisture-curable polyurethane, 2-10 parts of modified graphene, 0.5-5 parts of surfactant, and 0.1-3 parts of rare earth upconversion luminescent material; The modified graphene includes modified graphene oxide or modified reduced graphene oxide, and the modifying groups on the modified graphene include carboxyl groups and / or epoxy groups.

[0006] Preferably, the viscosity of the moisture-curing polyurethane is ≤500 mPa·s.

[0007] Preferably, the particle size of the modified graphene is 20~50nm.

[0008] Preferably, the surfactant comprises a perfluoroalkyl compound; The perfluoroalkyl compound includes at least one of potassium perfluorooctyl sulfonate and potassium perfluorobutyl sulfonate.

[0009] Preferably, the rare earth upconversion luminescent material includes NaYF4:Yb 3+ / Er 3+ NaYF4:Yb 3+ / Tm 3+ NaYF4:Yb 3+ / Ho 3+ Y2O3:Yb 3+ / Er 3+ and LiYF4:Yb 3+ / Er 3+ At least one of them; The particle size of the rare earth upconversion luminescent material is 50~100nm.

[0010] This invention also provides a method for preparing the graphene-based binder described in the above technical solution, comprising the following steps: The components of the graphene-based binder are mixed to obtain the graphene-based binder.

[0011] Preferably, the mixture includes: The surfactant was added to the moisture-curing polyurethane for the first stirring and mixing, the modified graphene was added for the second stirring and mixing, and the rare earth upconversion luminescent material was added for the third stirring and mixing to obtain a mixed system. The mixture was subjected to ultrasonication and degassing in sequence.

[0012] Preferably, the temperature of the first stirring and mixing is 20~30℃, the rotation speed is 400~600rpm, and the time is 5~15min; The second stirring and mixing speed is 400~600 rpm, and the time is 20~40 min; The third stirring and mixing speed is 400~600 rpm, and the time is 10~20 min; The ultrasound has a power of 200~400W, a frequency of 30~50kHz, and a duration of 10~30min; The degassing method is to allow the air to stand for 20-40 minutes.

[0013] The present invention also provides the application of the graphene-based binder described in the above technical solution or the graphene-based binder prepared by the preparation method described in the above technical solution in drone defense.

[0014] Preferably, the application includes the following steps: using an air vortex cannon to fire a graphene-based binder to achieve a precise strike against a drone.

[0015] This invention provides a graphene-based adhesive comprising the following components in parts by weight: 100 parts of moisture-curing polyurethane, 2-10 parts of modified graphene, 0.5-5 parts of surfactant, and 0.1-3 parts of rare earth on-conversion luminescent material; wherein the modified graphene includes modified graphene oxide or modified reduced graphene oxide, and the modifying groups on the modified graphene include carboxyl groups and / or epoxy groups.

[0016] The graphene-based adhesive provided by this invention, through the synergistic effect of modified graphene with moisture-curing polyurethane and other functional materials, based on air vortex cannon firing, combined with high-speed vortex ring dynamics, electromagnetics, classical contact mechanics and applied optics, achieves multimodal precision strikes (circuit short circuit, mechanical adhesion, visual obstruction) against drones with different dustproof ratings (IP5X / IP6X), effectively filling the gap in existing technologies and providing an innovative solution for drone defense in complex environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the mechanism of the graphene-based adhesive provided by the present invention during its application. Detailed Implementation

[0018] This invention provides a graphene-based adhesive comprising the following components in parts by weight: 100 parts of moisture-curable polyurethane, 2-10 parts of modified graphene, 0.5-5 parts of surfactant, and 0.1-3 parts of rare earth upconversion luminescent material; The modified graphene includes modified graphene oxide or modified reduced graphene oxide, and the modifying groups on the modified graphene include carboxyl groups and / or epoxy groups.

[0019] The graphene-based adhesive provided by this invention comprises 100 parts of moisture-curing polyurethane. In this invention, the viscosity of the moisture-curing polyurethane is preferably ≤500 mPa·s; specifically, the moisture-curing polyurethane is Henkel Loctite 3542.

[0020] Based on the mass fraction of the moisture-curing polyurethane, the graphene-based binder provided by this invention comprises 2 to 10 parts of modified graphene, specifically 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts. In this invention, the modified graphene includes modified graphene oxide or modified reduced graphene oxide, and the modifying groups on the modified graphene include carboxyl groups and / or epoxy groups. In this invention, the particle size of the modified graphene is preferably 20 to 50 nm. In a specific embodiment of this invention, the modified graphene is specifically purchased from Sigma-Aldrich reagents, catalog number 795542 (modified graphene oxide) or 910406 ​​(modified reduced graphene oxide). In this invention, the graphene modified with carboxyl groups and / or epoxy groups can enhance the chemical bonding with the polyurethane molecular chain and prevent aggregation.

[0021] Based on the mass fraction of the moisture-curing polyurethane, the graphene-based adhesive provided by this invention comprises 0.5 to 5 parts of surfactant, preferably 0.5, 1, 1.5, 2, 3, 4, or 5 parts. In this invention, the surfactant preferably comprises a perfluoroalkyl compound; the perfluoroalkyl compound preferably comprises at least one of potassium perfluorooctyl sulfonate and potassium perfluorobutyl sulfonate. In this invention, the surfactant can reduce surface tension and enhance the wettability of the adhesive on the surface of the drone.

[0022] Based on the mass fraction of the moisture-curing polyurethane, the graphene-based binder provided by this invention includes 0.1 to 3 parts of rare-earth on-conversion luminescent material, specifically preferably 0.1, 0.5, 1, 1.5, 2, 2.5, or 3 parts. In this invention, the rare-earth on-conversion luminescent material preferably includes NaYF4:Yb. 3+ / Er 3+ NaYF4:Yb 3+ / Tm 3+ NaYF4:Yb 3+ / Ho 3+ Y2O3:Yb 3+ / Er 3+ and LiYF4:Yb 3+ / Er 3+ At least one of the following; the particle size of the rare earth onconversion luminescent material is preferably 50-100 nm. In this invention, by adding rare earth onconversion luminescent material, the conversion from infrared supplementary light (850 nm) to visible light (540 nm) can be achieved, resulting in image overexposure.

[0023] This invention also provides a method for preparing the graphene-based binder described in the above technical solution, comprising the following steps: The components of the graphene-based binder are mixed to obtain the graphene-based binder.

[0024] In this invention, the mixing preferably includes: adding a surfactant to the moisture-curing polyurethane for a first stirring and mixing, adding modified graphene for a second stirring and mixing, and adding rare earth upconversion luminescent material for a third stirring and mixing to obtain a mixed system; and subjecting the mixed system to ultrasonication and degassing in sequence.

[0025] In this invention, the preferred temperature for the first stirring and mixing is 20-30°C, the preferred rotation speed is 400-600 rpm, and the preferred time is 5-15 minutes. Under these conditions, the first stirring and mixing ensures uniform dispersion of the surfactant, and by controlling the temperature, premature curing of the polyurethane can be avoided.

[0026] In this invention, the preferred stirring speed for the second mixing step is 400-600 rpm, and the preferred mixing time is 20-40 min. Performing the second mixing under these conditions ensures that the modified graphene is uniformly dispersed and does not agglomerate.

[0027] In this invention, the preferred stirring speed for the third mixing step is 400-600 rpm, and the preferred time is 10-20 min. In this invention, the preferred ultrasonic power is 200-400 W, the preferred frequency is 30-50 kHz, and the preferred time is 10-30 min; the preferred degassing method is static degassing, and the preferred time is 20-40 min. In this invention, ultrasonication can further improve the dispersion uniformity of each component.

[0028] The present invention also provides the application of the graphene-based binder described in the above technical solution or the graphene-based binder prepared by the preparation method described in the above technical solution in drone defense.

[0029] In this invention, the preferred application steps include: using an air vortex cannon to launch a graphene-based binder to achieve precise strikes against drones. This invention does not impose any specific limitations on the launching process; any method well-known to those skilled in the art can be used.

[0030] The graphite-based binder provided by this invention can achieve multimodal precision strikes against UAVs (circuit short circuit, mechanical adhesion, visual obstruction). The specific mechanism is as follows (a process diagram is shown in the figure for specific applications). Figure 1 (as shown) 1. Electronic system damage: Penetrating short circuit Conductive network construction When adhesive droplets come into contact with the surface of a drone (especially vulnerable points such as heat dissipation grilles, interface gaps, and exposed circuitry under the wings), the low-viscosity moisture-curing polyurethane carries graphene particles into the interior through capillary action. Graphene, with its nanoscale size, penetrates sealing structures with protection ratings below IP6X (such as micropores in rubber gaskets), forming continuous conductivity on the surface of circuit boards or cables.

[0031] Short circuit path: Prioritizes attacking high-voltage areas (such as battery positive and negative contacts, motor drive modules), bridging adjacent lines through graphene to form a local micro-arc (temperature can reach over 800℃), igniting the PCB substrate or plastic shell.

[0032] Anti-interference design: For the waterproof coating used on some drones, 1-2% potassium perfluorooctane sulfonate (PFOS) is added to the agent to reduce the surface tension of the liquid to below 18 mN / m and enhance the wettability to hydrophobic surfaces.

[0033] 2. Power System Paralysis: Dynamic Imbalance Attack Propeller adhesion and curing After the adhesive is sprayed onto the propeller surface, the polyurethane migrates towards the blade edge under the action of centrifugal force, while simultaneously reacting with moisture in the air to crosslink and cure. The cured PU film exhibits a gradient thickness distribution, disrupting the propeller's center of mass balance and inducing high-frequency vibrations (the resonance effect is significant when the frequency approaches the motor's rated speed).

[0034] Overload triggering: When the weight of each blade of the propeller or the angle between two adjacent blades is unequal, an imbalance occurs where the center of gravity of the entire propeller is not on the axis of rotation. If this imbalance is not addressed, it will affect the propeller's performance. In the static balance test of the propeller, when the unbalanced mass of the propeller exceeds 0.5 g·cm, the brushless motor current will increase by 300%, causing the ESC to overheat or burn out.

[0035] Secondary adhesion: The surface of the cured adhesive has a microstructure roughness, which can further adsorb dust (silica particles, etc.) in the air, and accelerate the wear of the power system by adhering to the shafts of propellers and gimbals.

[0036] 3. Information blocking: Optical-electrical dual-mode interference Camera obstruction The adhesive forms a cured film of a certain thickness on the lens of the gimbal camera, interfering with imaging in the following ways: Optical scattering: The composite film formed by the adhesive is covered on the drone gimbal, creating high haze in the visible light band and producing diffraction spots, which blurs the image.

[0037] Electrical signal coupling: Common sensor types include CMOS and CCD. Due to their low cost and low power consumption, CMOS sensors are generally used in imaging devices on drone gimbals. Two major factors affect the performance of CMOS sensors: noise and dark current. In CMOS sensors, parasitic capacitance forms between graphene and pixel units. Since each photodiode in a CMOS sensor requires an amplifier, and amplifiers are analog circuits, parasitic capacitance can disrupt the analog circuitry, leading to increased dark current noise and a decreased signal-to-noise ratio (SNR), thus affecting image quality.

[0038] Active interference: Rare earth upconversion luminescent materials are mainly solid compounds doped with rare earth elements. Utilizing the metastable energy level characteristics of rare earth elements, they can absorb multiple low-energy long-wave radiations, causing infrared light, invisible to the human eye, to be converted into visible light. This upconversion luminescence is also known as anti-Stokes luminescence. In this invention, rare earth upconversion materials (e.g., NaYF4:Yb) are incorporated into the pharmaceutical agent. 3+ / Er 3+ It can absorb the infrared fill light (850nm) from the drone and emit visible green light (540nm), causing image overexposure and affecting image quality.

[0039] Unless otherwise specified, the materials and equipment used in this invention are all commercially available products in the field.

[0040] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] In the following embodiments; The moisture-curing polyurethane is Henkel Loctite 3542, with a viscosity of ≤500 mPa·s; The modified graphene was purchased from Sigma-Aldrich reagent, catalog number 795542, with a particle size of 20~50nm; The particle size of the rare earth upconversion luminescent materials is 50~100nm, and they are all purchased from Alfa Aesar reagents; Among them, NaYF4:Yb in Examples 1 and 6 3+ / Er 3+ Purchased from Alfa Aesar reagent, catalog number 926531; NaYF4:Yb in Example 2 3+ / Tm 3+The reagent was purchased from Sigma-Aldrich, catalog number 926590. Y2O3:Yb in Example 3 3+ / Er 3+ The reagent was purchased from American Elements, catalog number Y-OX-05; NaYF4:Yb in Example 4 3+ / Ho 3+ The reagent was purchased from Sigma-Aldrich, catalog number 66698. LiYF4:Yb in Example 5 3+ / Er 3+ Purchased from Xi'an Ruixi Reagent, product number R-M1-8707.

[0042] Example 1 Pour 100 parts of moisture-curing polyurethane into a beaker, add 1.5 parts of potassium perfluorobutyl sulfonate (PFBS), and stir at 500 rpm for 10 minutes at 25°C to ensure uniform dispersion of the surfactant; slowly add 3 parts of modified graphene, and continue stirring at 500 rpm for 30 minutes to ensure that the particles do not agglomerate; add 0.75 parts of rare earth upconversion luminescent material, and stir at 500 rpm for 15 minutes. The resulting mixture was placed in an ultrasonic disperser with a power of 300W and a frequency of 40kHz and ultrasonically treated for 20 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 30 minutes to remove air bubbles, resulting in a graphene-based binder.

[0043] Example 2 Pour 100 parts of moisture-cured polyurethane into a beaker, add 2 parts of potassium perfluorooctane sulfonate (PFOS), and stir at 450 rpm for 12 minutes at 22°C to ensure uniform dispersion of the surfactant; slowly add 5 parts of modified graphene, and continue stirring at 550 rpm for 25 minutes to ensure that the particles do not agglomerate; add 1 part of rare earth upconversion luminescent material (NaYF4:Yb). 3+ / Tm 3+ Stir at 450 rpm for 18 minutes; The resulting mixture was placed in an ultrasonic disperser with a power of 250W and a frequency of 35kHz and ultrasonically treated for 25 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 25 minutes to remove air bubbles, resulting in a graphene-based binder.

[0044] Example 3 Pour 100 parts of moisture-cured polyurethane into a beaker, add 1 part of a mixture of potassium perfluorobutyl sulfonate (PFBS) and potassium perfluorooctyl sulfonate (PFOS) (mass ratio 1:1), and stir at 550 rpm for 8 minutes at 28°C to ensure uniform dispersion of the surfactant; slowly add 5 parts of modified graphene, and continue stirring at 450 rpm for 35 minutes to ensure that the particles do not agglomerate; add 0.5 parts of rare earth upconversion luminescent material (Y2O3:Yb). 3+ / Er 3+ Stir at 550 rpm for 12 minutes; The resulting mixture was placed in an ultrasonic disperser with a power of 350W and a frequency of 45kHz and ultrasonically treated for 15 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 35 minutes to remove air bubbles, resulting in a graphene-based binder.

[0045] Example 4 Pour 100 parts of moisture-curing polyurethane into a beaker, add 1.2 parts of potassium perfluorobutyl sulfonate (PFBS), and stir at 500 rpm for 10 minutes at 25°C to ensure uniform dispersion of the surfactant; slowly add 5 parts of modified graphene, and continue stirring at 500 rpm for 30 minutes to ensure that the particles do not agglomerate; add 0.6 parts of rare earth upconversion luminescent material (NaYF4:Yb). 3+ / Ho 3+ Stir at 500 rpm for 15 minutes; The resulting mixture was placed in an ultrasonic disperser with a power of 300W and a frequency of 40 kHz and ultrasonically treated for 20 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 30 minutes to remove air bubbles, resulting in a graphene-based binder.

[0046] Example 5 Pour 100 parts of moisture-curing polyurethane into a beaker, add 1.8 parts of potassium perfluorooctane sulfonate (PFOS), and stir at 400 rpm for 15 minutes at 20°C to ensure uniform dispersion of the surfactant; slowly add 5 parts of modified graphene, and continue stirring at 600 rpm for 20 minutes to ensure that the particles do not agglomerate; add 0.8 parts of rare earth upconversion luminescent material (LiYF4:Yb). 3+ / Er 3+ Stir at 400 rpm for 20 minutes; The resulting mixture was placed in an ultrasonic disperser with a power of 200W and a frequency of 30 kHz and ultrasonically treated for 30 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 40 minutes to remove air bubbles, resulting in a graphene-based binder.

[0047] Example 6 Pour 100 parts of moisture-cured polyurethane into a beaker, add 1 part of a mixture of potassium perfluorobutyl sulfonate (PFBS) and potassium perfluorooctyl sulfonate (PFOS) (mass ratio 2:1), and stir at 600 rpm for 5 minutes at 30°C to ensure uniform dispersion of the surfactant; slowly add 8 parts of modified graphene, and continue stirring at 400 rpm for 40 minutes to ensure that the particles do not agglomerate; add 0.9 parts of rare earth upconversion luminescent material (NaYF4:Yb). 3+ / Er 3+ Stir at 600 rpm for 10 minutes; The resulting mixture was placed in an ultrasonic disperser with a power of 400W and a frequency of 50 kHz and ultrasonically treated for 10 minutes to further improve the uniformity of particle dispersion. The mixture was then allowed to stand for 20 minutes to remove air bubbles, resulting in a graphene-based binder.

[0048] Performance testing To verify the practical application effect of the graphene-based binder prepared in this invention in drone defense, this invention tested a number of performance indicators of the binders prepared in Examples 1-6.

[0049] Test objects and methods: (1) Contact angle test (wetting): Using a contact angle meter (SDC-350), the contact angle of the adhesive droplet on the Teflon surface (simulating the hydrophobic coating of the drone) was tested.

[0050] (2) Conductivity test (penetration short-circuit capability): Apply adhesive to two copper wires with a spacing of 1 mm (simulating circuit pins), cure for 24 hours, and then use a multimeter to measure the resistance value.

[0051] (3) Bond strength test (mechanical destructive capability): The shear strength of carbon fiber reinforced composite material (simulating propeller material) was tested in accordance with GB / T 7124-2008 standard.

[0052] (4) Optical shielding performance: The adhesive is coated on the glass slide to form a film with a thickness of 0.5 mm. The average transmittance in the visible light band (380-780 nm) is tested using a UV-Vis spectrophotometer; and whether a visible light spot is generated under 980 nm laser excitation is observed.

[0053] The test results are shown in Table 1. Table 1 Performance test results of the graphene-based binders obtained in the examples

[0054] Results Analysis (1) Analysis of Electronic System Damage Capability: As shown in Table 1, the adhesives prepared in Examples 1-6 all exhibited excellent conductivity after curing. Among them, Example 6, due to the increased amount of modified graphene (8 parts), formed the densest conductive network with a resistance as low as 8.4 Ω, which was sufficient to induce a severe short circuit in the low-voltage area (3.3V / 5V) of the UAV circuit board. Although Example 1 had a lower graphene content (3 parts) and a resistance of 48.2 Ω, it was still within the range that could induce signal interference and logic level confusion. This indicates that the present invention can achieve effective electronic damage within the range of 2-10 parts of graphene addition.

[0055] (2) Wetting and Penetration Analysis: Contact angle data directly reflects the adhesive's ability to penetrate hydrophobic surfaces. Example 2, with the addition of 2.0 parts of potassium perfluorooctane sulfonate (PFOS), exhibited a contact angle as low as 16.2°, demonstrating extremely strong superwetting properties. This means that the formulation can quickly spread and penetrate into the tiny gaps in the drone's fuselage (such as heat dissipation vents and button gaps), carrying conductive graphene into the internal circuitry. In contrast, Examples 3 and 6, with lower surfactant content, had slightly higher contact angles, but still less than 35°, meeting basic wetting requirements.

[0056] (3) Damage to the propulsion system and adhesion: Shear strength test results showed that the adhesive strength of all embodiments was above 3.8 MPa. For high-speed rotating UAV propellers (speed > 5000 rpm), once the adhesive of this strength adheres and cures, the resulting eccentric mass (estimated from density and volume to be about 0.8~1.5 g) will generate a huge centrifugal force and cannot be detached by simple shaking. Example 6, due to its highest solid filler content and relatively high viscosity, formed a thicker adhesive layer with a shear strength of 5.1 MPa, and thus had the greatest potential for damage to the propulsion system.

[0057] (4) Optical Interference Performance: In optical testing, the visible light transmittance of all embodiments was less than 15%, with Embodiment 6 even as low as 3.2%. This indicates that the adhesive, after curing on the camera surface, can form a nearly black shielding layer, completely blocking visual navigation. Simultaneously, under infrared light excitation, each embodiment successfully emitted visible light of different colors (green, blue, and red), verifying the effectiveness of the rare-earth upconversion material. This dual mode of "active emission + passive shielding" can effectively deceive the UAV's visual sensors and infrared illumination system.

[0058] In summary, the graphene-based binder prepared by this invention achieves the expected tactical performance indicators in terms of conductivity, wettability, adhesive strength, and optical shielding through the synergistic effect of its components. Data from the various embodiments demonstrate that this invention can stably achieve multimodal precision strikes against unmanned aerial vehicles (UAVs) within its protected scope.

[0059] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A graphene-based adhesive, characterized in that, The components include the following parts by mass: 100 parts of moisture-curable polyurethane, 2-10 parts of modified graphene, 0.5-5 parts of surfactant, and 0.1-3 parts of rare earth upconversion luminescent material; The modified graphene includes modified graphene oxide or modified reduced graphene oxide, and the modifying groups on the modified graphene include carboxyl groups and / or epoxy groups.

2. The graphene-based binder according to claim 1, characterized in that, The viscosity of the moisture-curing polyurethane is ≤500 mPa·s.

3. The graphene-based binder according to claim 1, characterized in that, The modified graphene has a particle size of 20~50nm.

4. The graphene-based binder according to claim 1, characterized in that, The surfactant includes perfluoroalkyl compounds; The perfluoroalkyl compound includes at least one of potassium perfluorooctyl sulfonate and potassium perfluorobutyl sulfonate.

5. The graphene-based binder according to claim 1, characterized in that, The rare earth upconversion luminescent material includes NaYF4:Yb 3+ / Er 3+ NaYF4:Yb 3+ / Tm 3+ NaYF4:Yb 3+ / Ho 3+ Y2O3:Yb 3+ / Er 3+ and LiYF4:Yb 3+ / Er 3+ At least one of them; The particle size of the rare earth upconversion luminescent material is 50~100nm.

6. A method for preparing the graphene-based binder according to any one of claims 1 to 5, characterized in that, Includes the following steps: The components of the graphene-based binder are mixed to obtain the graphene-based binder.

7. The preparation method according to claim 6, characterized in that, The mixture includes: The surfactant was added to the moisture-curing polyurethane for the first stirring and mixing, the modified graphene was added for the second stirring and mixing, and the rare earth upconversion luminescent material was added for the third stirring and mixing to obtain a mixed system. The mixture was subjected to ultrasonication and degassing in sequence.

8. The preparation method according to claim 6, characterized in that, The temperature of the first stirring and mixing is 20~30℃, the rotation speed is 400~600rpm, and the time is 5~15min; The second stirring and mixing speed is 400~600 rpm, and the time is 20~40 min; The third stirring and mixing speed is 400~600 rpm, and the time is 10~20 min; The ultrasound has a power of 200~400W, a frequency of 30~50kHz, and a duration of 10~30min; The degassing method is to allow the air to stand for 20-40 minutes.

9. The application of the graphene-based binder according to any one of claims 1 to 5 or the graphene-based binder prepared by the preparation method according to any one of claims 6 to 8 in drone defense.

10. The application according to claim 9, characterized in that, The application includes the following steps: using an air vortex cannon to fire graphene-based binders to achieve precise strikes against drones.

Images