Radiation refrigeration film and use method thereof

Abstract

The invention discloses a radiation refrigeration film and a using method thereof, and particularly relates to the technical field of films, and the method comprises the steps that a drainage plate is wound through a metal aluminum foil, molecular-level combination between the metal aluminum foil and the radiation refrigeration film is achieved, interface thermal resistance is reduced, and a radiation refrigeration film belt covers and is wound outside a metal foil belt. And the temperature is further reduced through radiation heat dissipation. Mechanical fastening and radiation refrigeration are combined, the synergistic effect of treating both symptoms and root causes is achieved, operation is easy, safety and reliability are achieved, the device is suitable for high-altitude operation in the non-power-failure state, the overheating problem of the tension drainage plate can be effectively solved, and safe operation of a power grid is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin films, and more particularly, to a radiation refrigeration film and a method of using the same. BACKGROUND

[0002] The power transmission line is operated in the field environment for a long time, and it is difficult to maintain. The heat of the tension lead plate has become a problem to be solved, which seriously threatens the stable operation of the power system.

[0003] The existing public document 1 (Analysis and prevention and treatment measures of the heat of the tension clamp lead plate of the power transmission line, 2025) proposes to check the line regularly using a drone carrying an infrared temperature measuring instrument, and to finely measure the temperature of the tension clamp lead plate, to help us timely investigate the heat problem of the tension clamp lead plate, and quickly find the possible loose bolts. Once the bolt is found to be loose, the bolt fastening work needs to be carried out immediately to ensure the tightness and good contact of the conductor connection part. At the same time, it can prevent dirt from accumulating in the gap and can enhance the stability of the lead plate and reduce further loosening caused by vibration, which can effectively reduce the contact resistance and eliminate the heating problem caused by poor contact. However, in actual operation, a large amount of manpower and material resources will be consumed, and the possibility of heat of the tension lead plate is not fundamentally reduced.

[0004] The existing public document 2 (Analysis and countermeasures of the heat of the tension lead plate of the super and ultra-high voltage power transmission line in the southern region, 2023) proposes that the temperature of the power transmission line under normal conditions is 34.98℃, but the measured temperature of the tension lead plate is 53.48℃, which has formed a general defect, as shown in the figure. Figure 2 It is proposed to carry out zinc plating treatment on the surface of the tension lead plate to avoid scratches during transportation, and to avoid surface oxidation. In the section where corrosion is serious, protective measures should be strengthened. A flexible wear-resistant coating can be coated on the zinc-plated surface to significantly improve the corrosion resistance life and anti-fretting corrosion properties of the tension lead plate and the tension clamp. However, the maintenance cost of zinc is high, the composition is not suitable, the interface contact thermal resistance is not reduced, and the use effect of the power transmission line may be affected.

[0005] Therefore, there is an urgent need for a method that can adapt to the complex conditions of the power transmission line, directly improve the heat conduction efficiency, and cool the tension lead plate. SUMMARY

[0006] In order to overcome the above-mentioned defects of the prior art, the present application provides a radiation refrigeration film and its use method, which is achieved by winding the metal foil belt on the specific part of the drainage plate, mechanically fastening the internal movable pressing plate to reduce the contact resistance from the source and suppress heat generation, based on the interface co-growth process of "molecular anchoring grafting" and "in-situ solidification film", using the "Ji Gu-Cold Shield" synergistic cooling system, realizing the molecular level combination between the metal aluminum foil and the radiation refrigeration film, greatly reducing the interface thermal resistance, and improving the heat conduction efficiency to solve the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions: A radiation refrigeration film and its use method, comprising the following steps: S1: using the "Ji Gu-Cold Shield" synergistic cooling system to perform multi-modal perception and thermal fault diagnosis on the strain drainage plate; S2: automatically deciding and executing aluminum foil fastening and radiation refrigeration film covering; S3: verifying the cooling result efficiency and iterating the parameters of the "Ji Gu-Cold Shield" synergistic cooling system; In the S1, the "Ji Gu-Cold Shield" synergistic cooling system intelligently diagnoses thermal faults through multi-source perception and double-flow convolutional neural network, automatically decides the fastening parameters according to the fault level, realizes the constant tension winding of the metal aluminum foil by means of the force control mechanical arm, and then performs surface flatness detection; when detecting that there is microscopic unevenness on the outer surface of the aluminum foil belt, using the interface co-growth process based on "molecular anchoring grafting" and "in-situ solidification film", after activating the surface of the aluminum foil by plasma, using the flexible micro-reaction chamber technology, controlling the temperature and humidity in a closed nitrogen environment, the piezoelectric atomizing nozzle sprays the pre-hydrolyzed silane coupling agent solution, the silicon alcohol group and the activated hydroxyl group of the aluminum foil form a covalent bond through a synergistic proton transfer mechanism, the other end extends an active amino group, the solution concentration and standing time are controlled, and the molecular self-assembly process is monitored in real time by using a laser interferometer, the molecules are driven to diffuse and arrange autonomously, then the sprayed bifunctional monomer fills the microgap through capillary action and covalently grafts with the molecular anchor, and a three-dimensional network interface layer is formed by ultraviolet curing, which can form a firm covalent bond with the radiation refrigeration film to reduce the interface thermal resistance and realize passive cooling of the strain drainage plate.

[0008] Further, the plasma activation is achieved by using low-temperature atmospheric plasma technology, high-activity particles in the plasma physically bombard to remove nanoscale pollutants, and at the same time, active oxygen free radicals chemically react with the surface to generate hydroxyl active sites, and real-time spectrum monitoring ensures the consistency of the processing process.

[0009] Further, the capillary action is achieved by designing a monomer mixture with low surface tension and appropriate viscosity, which means that the physicochemical parameters of the monomer mixture should meet the requirements to enable it to fill and level the micro-gap autonomously relying only on capillary effect and controlled temperature gradient, thereby forming a uniform liquid film.

[0010] Further, the aluminum foil fastening in S2 selects aluminum foil as the film substrate based on the fact that the tension-resistant drainage plate is made of aluminum. The homogenous material properties of the aluminum device enable the aluminum foil tape with the film to be firmly and conveniently applied to the surface of the drainage plate through shearing and pasting winding.

[0011] Further, the multi-modal sensing and thermal fault diagnosis of the tension-resistant drainage plate specifically includes: fusing the temperature distribution data collected by the infrared thermal imager and the real-time load data obtained by the current sensor, and inputting the obtained real-time load data into a pre-trained thermal fault diagnosis model for analysis; the pre-trained thermal fault diagnosis model adopts a dual-stream convolutional neural network algorithm based on an attention mechanism, wherein the visual branch processes temperature field image features, the time sequence branch analyzes electrical parameter change trends, and a thermal fault grade score G and a hot spot area location are output through feature fusion.

[0012] Further, the "intelligent enclosure-cool shield" collaborative cooling system receives the geometric features of the hot spot area identified by the vision system, calls the optimal coverage algorithm in the path planning algorithm library, and automatically generates a mechanical arm winding path trajectory that can completely cover the hot spot area and fit the surface of the component without collision.

[0013] Further, the collaborative proton transfer mechanism is the core microscopic mechanism for forming strong covalent bonds. The hydroxyl group on the surface of the aluminum foil acts as a weak acid and transfers its proton to the oxygen atom of the silanol group in a water molecule environment. A negatively charged alumina root is generated on the surface, while a positively charged silicon center is formed on the silanol group molecule. The strong nucleophile rapidly attacks the electrophilic silicon center, ultimately removes a molecule of water, and forms a Si-O-Al covalent bond.

[0014] Further, the number of coverage layers of the radiation cooling film in S2 is determined by the required total cooling power, the measured cooling power per unit area of the film, and the area to be covered. The calculation logic is as follows: first, calculate the equivalent number of layers required to meet the cooling demand, i.e., the required total cooling power divided by the product of the cooling power per unit area of the film and the area to be covered. Then, the calculation result of the equivalent number of layers is rounded up to determine the final number of coverage layers.

[0015] Further, the performance verification in S3 is to collect temperature data after cooling at a high frequency through a pre-buried distributed temperature sensor network or an infrared thermal imager scanned automatically periodically, mainly monitoring the temperature drop rate and steady-state temperature value.

[0016] Further, the parameter iteration in S3 is to collect temperature data of the drainage plate in subsequent operation through a fixedly installed wireless temperature sensor or a regular unmanned aerial vehicle inspection mode after the deployment of the radiation cooling film, and to upload the data to a cloud platform or a local data center in an encrypted manner, and to bind and archive the unique identity of the drainage plate.

[0017] The technical effects and advantages of the radiation cooling film and the use method thereof are as follows: The present application realizes the molecular-level combination between the aluminum foil and the PDMS / ZrO2 radiation cooling film through the covalent bond interface layer, greatly reduces the interface thermal resistance, realizes the order of magnitude improvement of the heat conduction efficiency, passively cools without external energy, reduces the surface temperature of the tension drainage plate, and has the advantages of simple operation, strong weather resistance, and application to the tension drainage plate cooling of the power transmission line and the significant improvement of the power grid operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The present application is a radiation cooling film and a use method flowchart.

[0019] Figure 2 The present application is a radiation cooling film and a use method flowchart.

[0020] Figure 3 The present application is a radiation cooling film and a use method flowchart.

[0021] Figure 4 The present application is a radiation cooling film and a use method flowchart.

[0022] Figure 5 The present application is a radiation cooling film and a use method flowchart.

[0023] Figure 6 The present application is a radiation cooling film and a use method flowchart.

[0024] In the figure: 1, tension insulator string; 2, compression tube; 3, power transmission conductor; 4, tension clamp drainage plate nut; 5, drainage wire; 6, nut; 7, bolt head. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Embodiment 1 With reference to the flowchart shown, the radiation cooling film and the use method thereof according to the present application include the following steps: Figure 1 S1: using the“intelligent enclosure-cold shield”cooperative cooling system to perform multi-modal perception and thermal fault diagnosis on the tension flow plate.

[0027] S2: automatically deciding and executing aluminum foil fastening and radiation cooling film covering.

[0028] S3: verifying the cooling result performance and iterating the parameters of the“intelligent enclosure-cold shield”cooperative cooling system.

[0029] Further, in S1, the“intelligent enclosure-cold shield”cooperative cooling system is used to perform multi-modal perception and thermal fault diagnosis on the tension flow plate, including that in the specific implementation engineering of cooling the tension flow plate of the power transmission line, the“intelligent enclosure-cold shield”cooperative cooling system constructs a high-reliability and high-precision on-site perception array, the array is integrated in an integrated protective shell, is fixed on the tower member near the tension clamp through a hoop or a magnetic base, and ensures that the field of view and the detection angle cover the entire tension flow plate area. Figure 3 A schematic structural view of the tension flow plate of the power transmission line, including a tension insulator string 1, a compression pipe 2, a power transmission wire 3, a tension clamp flow plate nut 4, a flow line 5, a nut 6, and a bolt head 7. The perception unit is configured in detail as follows: a high-precision infrared thermal imager (with a resolution of not less than 640x480 pixels and a thermal sensitivity of <40mK), a high-sensitivity ultrasonic probe (with a center frequency of 5MHz), a laser 3D scanner (performing 25Hz scanning per second), a wind speed meter, a temperature and humidity sensor, and a sunshine radiation sensor.

[0030] The dual-stream convolutional neural network based on the attention mechanism includes: a visual stream as an infrared thermal image sequence after input preprocessing and a calculated optical flow field, a 3DCNN architecture is used to extract spatiotemporal dynamic features, and a visual feature vector is output; a data stream as an input structured feature vector, a fully connected layer or a 1DCNN is used for feature coding, and a data feature vector is output; and a cross-modal attention fusion module dynamically evaluates which features are most discriminative for fault diagnosis under the current specific working condition.

[0031] ​The thermal failure grade score G is defined as the probability of a severe failure, i.e. G = P_severe. As shown in Table 1, this is a continuous value between 0 and 1, which intuitively reflects the severity of the failure, and according to which the input data "ZhiGu-Cold Shield" collaborative cooling system will automatically make a repair decision.

[0032] Table 1 Decision results according to thermal failure grade

[0033] Further, the most core innovation of the present application is to break through the limitation of traditional physical pasting or simple chemical treatment, and a firm molecular bridge based on covalent bond is constructed between the metal aluminum foil and the radiative cooling film through a process named "molecular anchor self-assembly", which is a decisive link for the whole technology to realize "orders of magnitude improvement in heat conduction efficiency".

[0034] The silane coupling agent (APTES) is a kind of interface coupling agent with excellent performance, and its general formula is Y-R-Si-X3. Y functional group: it is an organic active group (such as amino, epoxy, vinyl and the like), and in the present application, the amino group (-NH2) is selected, which can occur ring-opening reaction or Michael addition reaction with the subsequently sprayed polymer monomer (such as epoxy resin), to form a firm covalent bond (C-N bond). R: a stable alkyl chain, which plays a spacing and stabilizing role, Si-X3: a hydrolyzable inorganic group (such as ethoxy-OC2H5, methoxy-OCH3), which generates a highly active silanol group (-Si-OH) after hydrolysis, which is the key to bonding with the inorganic surface. Its working principle can be understood as "one hand holds the inorganic surface and the other hand holds the organic polymer", thereby realizing the cross-linking and high-strength connection from inorganic to organic.

[0035] The specific reagent used in the present application is 3-aminopropyl triethoxysilane (APTES). Its reaction with the surface of the aluminum foil is not a simple adsorption, but a complex, multi-step chemical bonding process, the core of which is a synergistic proton transfer mechanism, as shown in Figure 4 The "anchoring group" silanol group (-Si-OH): the -Si(OC2H5)3 of APTES is partially hydrolyzed in an ethanol solution to generate a more active silanol group (-Si-OH). When these silanol groups meet the Al-OH groups on the surface of the plasma-activated aluminum foil, condensation reaction occurs, one molecule of water is removed, and a firm and irreversible Si-O-Al covalent bond is formed. This reaction mechanism is the theoretical core of forming a high-strength and stable interface, and the bond energy of the Si-O-Al bond is as high as 500 kJ / mol, which is much higher than the van der Waals force of physical adsorption (usually < 50 kJ / mol), thereby ensuring the long-term stability of the interface under harsh conditions such as thermal stress and mechanical vibration.

[0036] In actual operation, the process is automatically executed by the "Zhi Gu-Cold Shield" system, the specific content is as follows: 1. Silane coupling agent parameter selection and processing: APTES stock solution is dissolved in anhydrous ethanol to prepare a working solution with a concentration of 2.5% (v / v). The working solution needs to be pre-hydrolyzed, and a small amount of deionized water (catalytic hydrolysis) is added to the working solution and stirred for 30 minutes. This converts part of the ethoxy group (-OC2H5) to a highly reactive silanol group (-Si-OH), and the reaction equation is as follows: H2N-(CH2)3-Si(OC2H5)3+3H2O=H2N-(CH2)3-Si(OH)3+3C2H5OH.

[0037] Concentration control is crucial. If the concentration is too low, the monolayer coverage is insufficient, and there are defects. If the concentration is too high, intermolecular condensation is easy to occur, forming a loose multi-layer deposition rather than a dense monolayer. A concentration of 2.5% is the best value verified by a large number of experiments. Table 2 shows the experimental results at different APTES concentrations. As can be seen from the table, when the APTES concentration is less than 2.5%, it is difficult to form a complete and dense monolayer on the aluminum foil surface due to the insufficient number of active molecules in the solution, resulting in a decrease in coverage. When the concentration exceeds 2.5%, not only will the excess APTES molecules react with the hydroxyl groups on the aluminum foil surface, but they will also undergo condensation reactions (i.e., self-polymerization) among themselves, forming a chaotic and multi-layered structure. This multi-layer structure is less ordered and stable than a monolayer, and the activity and accessibility of its terminal functional groups (-NH2) will also decrease, which is not conducive to subsequent reactions with the bridging monomer, resulting in a downward trend in interface performance (shear strength and thermal resistance). Therefore, a concentration of 2.5% is the best balance point between "ensuring complete coverage" and "avoiding excessive polymerization". At this concentration, a dense, ordered, and highly reactive monolayer can be formed, laying a solid foundation for subsequent reactions and ultimately achieving the lowest interface thermal resistance and the highest connection strength.

[0038] Table 2 Experimental results at different APTES concentrations

[0039] In actual engineering, in view of the challenges of large temperature difference and much vibration in field operation environment, the application adopts online real-time mixing and real-time monitoring and adjustment technology to prepare APTES working solution: the system built-in micro-metering pump accurately extracts APTES stock solution, anhydrous ethanol and catalytic deionized water according to the volume ratio of 2.5:96.5:1.0, injects into constant temperature mixing cavity, stirs at 1200 rpm for 30 minutes, completes pre-hydrolysis (H2N-(CH2)3-Si(OC2H5)3+3H2O=H2N-(CH2)3-Si(OH)3+3C2H5OH), generates high reactive silanol group. In order to overcome the deviation of solution concentration caused by environmental temperature change, the online refractometer integrated in the pipeline detects the refractive index of the solution in real time, and automatically compensates the temperature influence through the pre-calibrated "refractive index-concentration-temperature" three-dimensional curve family, accurately converts the concentration value; if the measured value deviates from the target range (2.48%-2.52%v / v), the control system automatically adjusts the formula proportion of the metering pump for secondary mixing. The high-precision piezoelectric atomizing nozzle is used to atomize the above-mentioned solution into uniform droplets with particle size of 1-5 μm, under the blowing of nitrogen carrier, the droplets are uniformly deposited on the surface of the plasma activated aluminum foil. The deposition density is controlled at 800 droplets / mm², the droplet volume is 120 pL, which ensures that the final spraying concentration is strictly stable at 2.5±0.2%(v / v). The concentration is the optimal solution optimized by a large number of experiments (see Table 2), which can achieve the best balance between "guarantee complete coverage" and "avoid excessive polymerization", so as to form a dense monolayer with a coverage rate of more than 95% and high reactivity.

[0040] 2. Self-assembly environment control: Precise control of temperature and humidity is the basis for ensuring the efficient and orderly reaction of silane coupling agent (APTES). In actual engineering, a flexible fluororubber micro-reaction chamber is used, which is mounted on the end of a six-axis collaborative robot. Under the guidance of the vision system, it is precisely pressed on the surface of the drainage plate wrapped with aluminum foil. Then, the inflatable self-adaptive sealing ring at the edge of the chamber is filled with dry nitrogen to 60±5kPa, so that it forms a reliable seal with the drainage plate surface of different curvatures. Subsequently, the system starts a two-stage environmental purification program. Using a micro diaphragm pump, the air in the chamber is first pumped to -80kPa vacuum and maintained for 30 seconds, which expels most of the air and volatile pollutants. Then, high-purity nitrogen (purity ≥ 99.999%) is filled to a slight positive pressure (+5kPa). This "vacuum-nitrogen filling" cycle is accurately performed twice to ensure that the oxygen concentration in the chamber is less than 50ppm and the moisture concentration is less than 10ppm, completely eliminating the interference of external environmental fluctuations on molecular-level reactions. After environmental purification is completed, the system starts high-precision temperature and humidity closed-loop control. Using a platinum resistance temperature sensor (accuracy ±0.1℃) based on close contact with the back of the aluminum foil for real-time feedback, the PID controller dynamically adjusts the driving current of the semiconductor thermoelectric cooler (TEC) to stabilize the aluminum foil surface temperature at the optimal reaction temperature of 25.0±0.5℃, overcoming the influence of sunlight radiation, wind speed changes and other outdoor environmental factors. At the same time, a capacitive humidity sensor (accuracy ±2%RH) continuously monitors the humidity in the chamber, and through the coordinated work of the ultrasonic atomizer (generating 1μm-5μm water mist particles) and the molecular sieve drying module, the relative humidity is accurately maintained in the golden interval of 55±3%RH. Table 3 shows the performance indicators of self-assembled monolayers under different temperature and humidity conditions. This temperature and humidity parameter, through molecular dynamics simulation and experimental verification, can maximize the heterogeneous condensation reaction rate of silanol groups and aluminum surface hydroxyl groups, while effectively inhibiting the self-polymerization side reaction of APTES molecules, creating ideal conditions for forming a dense and orderly monolayer.

[0041] Table 3 Performance indicators of self-assembled monolayers under different temperature and humidity conditions

[0042] 3. Adaptive control of standing time: The concentration-qualified solution is uniformly sprayed on the plasma-activated aluminum foil surface by high-precision piezoelectric atomizing nozzle at a deposition density of 800 drops / mm2and a volume of 120 pL / drop. The spraying process is completed within 15 seconds. Subsequently, the system enters a standing reaction period of 90 to 120 seconds, during which the chamber maintains constant temperature and humidity. The entire process is not simply timed, but is monitored in real time by a laser interferometer, which emits a 632.8 nm laser beam at a 45° angle to irradiate the surface. Through the analysis of the inversion algorithm of the reflected light interference fringes, the molecular film thickness and uniformity are calculated in real time (with a resolution of 0.1 nm). When the system monitors that the film thickness has grown to 1.2 nm-1.8 nm and the thickness change rate is less than 0.1 nm / s for more than 5 seconds, it is determined that the reaction is complete, and the standing time can be ended in advance. If the stable standard is not reached by 90 seconds, the system is forcibly terminated after a maximum delay of 120 seconds. After the standing time ends, the online contact angle measuring instrument integrated in the chamber immediately performs verification. A successful monolayer will cause the surface contact angle to change from hydrophobic (> 90°) to hydrophilic (< 40°), which is a direct criterion for reaction success. This adaptive time control based on real-time feedback not only ensures the sufficiency of covalent bonding, but also adapts to differences in different surface states (such as oxidation degree and micro roughness), optimizing process efficiency and reliability.

[0043] 4. Real-time monitoring: During the process, the laser interferometer monitors the growth of the molecular film in real time, and the uniformity and completion of the reaction are judged by the changes in film thickness and refractive index. The online contact angle measuring instrument verifies immediately after the reaction is completed. The treated surface changes from hydrophobic (contact angle > 90°) to hydrophilic (contact angle < 40°), which is direct evidence of the surface being rich in polar amino (-NH2) groups, and is a preliminary indication of the success of self-assembly.

[0044] The formation of a self-assembled monolayer (SAM) is that these coupling agent molecules are not randomly adsorbed on the surface, but spontaneously ordered and arranged through intermolecular forces to form a dense and uniformly oriented self-assembled monolayer (SAM). The thickness of this SAM is only 1-2 nm, but it provides a uniform and high-density active site platform for subsequent reactions. Table 4 compares the interface properties of different bonding processes. The molecular anchor self-assembly process is superior to other bonding processes in terms of interface shear strength, durability, and processing time, and can significantly reduce thermal resistance, improve heat conduction efficiency, and reduce the temperature of the tension drainage panel.

[0045] Table 4 Comparison of interface properties of different bonding processes

[0046] The whole process of anchoring and grafting of molecules on the surface of aluminum foil of transmission line strain flow plate is surface activation treatment, self-assembly of molecular anchor, spraying and leveling of bridging monomer. The surface activation treatment adopts low-temperature atmospheric plasma technology, the power is 150 W, the treatment distance is 5 mm, the scanning speed is 10 mm / s, and the whole predetermined winding area is covered. The plasma working gas is helium-oxygen mixed gas (He:O2=95:5), and the gas flow is 5 L / min. The treatment time is automatically adjusted according to the surface state (30-90 seconds), and the intensity of the characteristic spectrum line at 422.6 nm is monitored in real time by emission spectrum to ensure that the activation effects of the aluminum foil surfaces in different areas are consistent. After activation, the surface contact angle is reduced from 89.8° to 38.5°, and the surface energy is increased from 35 mJ / m² to 72 mJ / m², which creates conditions for self-assembly of molecular anchors.

[0047] The self-assembly process of the molecular anchor uses an ethanol solution (concentration 2.5% v / v) of 3-aminopropyltriethoxysilane (APTES), which is uniformly sprayed by a piezoelectric microdroplet spraying unit with a droplet volume of 120 pL and a deposition density of 800 droplets / mm². The ambient temperature is controlled at 25.0±0.5°C, and the relative humidity is controlled at 55±3%RH. The self-assembly is completed after 90 seconds of standing. XPS is an extremely surface-sensitive analysis technique that can detect the elemental composition and chemical state within a few nanometers of the material surface. Table 5 is a comparison table of X-ray photoelectron spectroscopy (XPS) analysis data, which shows that after treatment, the atomic ratios of O / C and N / C are 44.6% and 0.215% respectively, and the content of C-Si bond increases from 6.78% to 10.09%, proving that the molecular anchor is successfully grafted and forms a dense monolayer.

[0048] Table 5 Comparison table of X-ray photoelectron spectroscopy (XPS) analysis data

[0049] Spraying and leveling of bridging monomer uses a bifunctional monomer solution (diglycidyl ether bisphenol A type epoxy resin and hydroxyethyl acrylate, molar ratio 3:1) with a flow rate of 0.8 μL / s to form a liquid film of 15±3 μm. The Marangoni leveling effect is promoted by an adaptive temperature control system (substrate 35°C, edge 40°C) with a leveling time of 120 seconds. Real-time interferometer monitoring shows that after leveling, the surface roughness Ra is reduced from 1.2 μm to 0.12 μm, and the wavefront difference is <λ / 10, meeting the requirements of subsequent processes. Table 6 is a table of molecular anchor grafting process parameters of strain flow plate.

[0050] Table 6 Table of molecular anchor grafting process parameters of strain flow plate

[0051] Through the above detailed theoretical analysis, process elaboration and experimental data verification, we can firmly conclude that the interface symbiotic growth process of "molecular anchoring grafting" and "in-situ solidification film formation" is the core of the invention. It is not a simple coating process, but a surface chemical engineering at the molecular level with precise control. It forms a strong Si-O-Al covalent bond through the synergistic proton transfer mechanism, firmly anchoring the "molecular anchor" on the aluminum foil surface. Through the self-assembly process, a dense, ordered monolayer with active amino groups at the end is formed. This nanoscale structure fundamentally solves the high thermal resistance of heterogeneous material interfaces.

[0052] The fundamental reason for the heating of the tension drainage plate is that the contact resistance is too large. Due to long-term exposure to wind, rain, dust, salt mist and other environments, the crimping interface will be oxidized, loose or corroded, resulting in increased resistance. According to Joule's law (P=I²R), when a large load current (I) flows through this increased resistance (R), abnormal heat (P) will be generated, forming a hidden danger of overheating and threatening the safety of the power grid. Radiative cooling film is not a simple thermal insulation material, but a functional material that actively dissipates heat. Radiative cooling film is an insulator that covers the outside of the drainage plate and does not participate in the conduction of current. It usually has excellent weather resistance, chemical corrosion resistance, hydrophobicity and mechanical flexibility, and can well adapt to outdoor harsh environments to ensure long-term effective service life. Radiative cooling film usually has a double-layer structure: the base layer is 50-100 μm thick polyethylene terephthalate (PET), which provides mechanical support; the functional layer is a 100-200 μm thick polydimethylsiloxane (PDMS) film, which uniformly disperses zirconium dioxide (ZrO2) or silicon dioxide (SiO2) nanoparticles. Figure 5 For the heat transfer process of PDMS / ZrO2 radiative cooling film, the heat flow balance process of PDMS / ZrO2 radiative cooling film is shown, which realizes passive cooling by reflecting solar radiation and radiating heat to the universe. The heat exchange with the atmosphere and the surrounding environment is also included in the figure, where P solar represents the solar radiation power, i.e. the solar radiation energy received per unit area, which is the main heat source that the material needs to reflect or avoid absorbing, rad represents the power radiated by the material, and the radiative cooling material radiates heat to the universe through the atmospheric window to realize spontaneous cooling, atm represents the atmospheric radiation power, i.e. the energy radiated downward by the atmosphere, which will be absorbed by the material, nonradThis indicates the non-radiative heat exchange power. ZrO2 nanoparticles exhibit extremely high Mie scattering efficiency for sunlight (0.3μm-2.5μm wavelength), achieving a solar reflectivity of over 95%, thus reducing heat input. Furthermore, the PDMS matrix possesses strong infrared vibrational absorption-emission characteristics within its atmospheric transparency window (8μm-13μm), enabling it to efficiently radiate heat into the cold outer space (approximately 3K). It also absorbs a small amount of atmospheric radiation and exchanges heat non-radiatively with the surrounding environment. When the radiative heat dissipation exceeds the absorbed heat, the material achieves a cooling effect below ambient temperature. Addressing the issue of localized overheating caused by excessive contact resistance in tension-resistant drainage plates, this film can rapidly dissipate heat through efficient thermal radiation.

[0053] In the engineering of the "Smart Enclosure-Cold Shield" synergistic cooling system for the tension diversion plate of power transmission lines, the radiative cooling film is bombarded with oxygen plasma before lamination. The high-energy plasma oxidizes the inert methyl groups (-CH3) on the PDMS surface into active silanol groups (-SiOH). The end of the robotic arm switches to a flexible vacuum chuck to pick up the film and laminate it onto the polymer interface layer with a constant pressure of 5.0N±0.2N. The remaining epoxy / acrylate groups in the polymer interface layer react with the Si-OH on the PDMS film surface. Some of the free radicals or silane coupling agents generated by the photoinitiator are retained in the polymer interface layer. These can catalyze or directly react with Si-OH to undergo silanol condensation reaction, ultimately forming a fully covalent bond connection of Al->Si-O-Al->SAM->CNC->Polymer->CO-Si->PDMS. The transmission efficiency in strong covalent bond networks is several orders of magnitude higher than that in physical contacts with weak van der Waals forces, thereby minimizing interfacial thermal resistance. Tension-resistant diverter plates treated with molecular anchoring grafting technology achieve a temperature rise and fall of 10.6℃ and a heat transfer coefficient increase of 47.8% under normal operating load. Their service life is expected to be extended by 3-5 times, and the entire process takes about 25-35 minutes, significantly improving the efficiency and economy of power grid operation and maintenance.

[0054] Furthermore, in S3, after all processes are completed, the system does not immediately withdraw but initiates a refined cooling effect verification phase lasting no less than 5 minutes. This phase aims to scientifically quantify the treatment effect and provide data support for subsequent iterations. Specifically, it includes the following: 1. Thermal Imaging Verification: Using an infrared thermal imager, thermal image sequences of the treated area and surrounding reference areas are continuously acquired at a rate of 1 frame per second, for a total duration ≥ 5 minutes (i.e., ≥ 300 frames of data). The difference between the highest temperature of the hotspot identified before treatment and the average temperature of that point within 5 minutes after treatment is calculated; this is the most intuitive performance indicator. The standard deviation of the temperature of the entire treated area (aluminum foil-covered area) within 5 minutes after treatment is also calculated. 2. Thermodynamic Verification: The robotic arm's end effector switches to a contact-type miniature heat flux sensor. This sensor is applied with constant pressure (e.g., 2N) to a point on the surface of the radiative cooling film. Simultaneously, another contact temperature sensor measures the film surface temperature at that point, and another sensor measures the ambient temperature. According to Fourier's law, by measuring the heat flux density q and the temperature gradient, the equivalent thermal resistance can be calculated.

[0055] The system encrypts and packages all data during the execution process, forming a "digital archive" of the governance effort. The data is divided into two main categories: process parameters, including the actual tension curve of foil winding, temperature and humidity records of the micro-reaction chamber in the molecular process, APTES reaction time, online measured contact angle values, UV curing strength and time, etc.; and status data, including the raw data and diagnostic results of multimodal sensing in stage S1 (G-value, thermograms, ultrasonic features, etc.) and performance verification data in stage S3. All this data is uploaded to the cloud platform via 4G / 5G or satellite links using the TLS encryption protocol.

[0056] On the cloud platform, each real tension-resistant drainage plate has a corresponding "digital twin" model in the system. This model not only includes its static attributes (such as model, material, installation location, and commissioning time), but also dynamically binds the full lifecycle data of each inspection, diagnosis, treatment, and verification. Each treatment data package is archived as a new "medical record" on its corresponding digital twin. Using a deep neural network (DNN), a multi-input multi-output predictive model is trained. This model can predict the optimal combination of processing parameters based on the input fault state and operating conditions to maximize the desired performance indicators. Based on this model, the decision algorithms in stages S1 and S2 can be optimized in reverse. For example, the attention weights of the dual-flow CNN in the S1 diagnostic model can be optimized to make it more sensitive to certain fault modes; the winding number formula in the S2 decision algorithm can be optimized to achieve the best match between the output winding number command and the actual effect; the temperature and humidity setpoints and reaction times in the molecular process can be optimized to form the optimal process package for different environmental conditions. The optimized algorithm parameters and process specifications will be updated to a central process knowledge base.

[0057] The cloud-based system uses secure OTA (Over-The-Air) technology to push update packages to all online "Smart Lock-Cold Shield" collaborative cooling system terminal devices. Updates can be scheduled during nighttime sleep or when the devices are back in storage for charging, without affecting daytime operations. The terminal devices will then use the latest version of algorithms and process parameters the next time they execute a task, thus achieving collective evolution and continuous performance improvement for the entire system. Figure 6 The system is a cloud-based intelligent analysis iterative process diagram. It realizes a closed-loop process from terminal operation, data collection and uploading, cloud AI analysis to parameter OTA distribution. Through digital twins and machine learning, it continuously optimizes decision-making algorithms to form a self-iteratory intelligent operation and maintenance system.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0059] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A radiative cooling film and methods of use thereof, characterized in that, It comprises the following steps: S1: using the "Zhi Gu-Cold Shield" collaborative cooling system to perform multi-modal perception and thermal fault diagnosis on the strain flow plate; S2: automatically deciding and executing aluminum foil fastening and radiation cooling film covering; S3: verifying the cooling result effectiveness and iterating the parameters of the "Zhi Gu-Cold Shield" collaborative cooling system; In S1, the "Zhi Gu-Cold Shield" collaborative cooling system intelligently diagnoses thermal faults through multi-source perception and double-flow convolutional neural network, automatically decides the fastening parameters based on the fault level, and after the constant tension winding of the metal aluminum foil is realized by the force control mechanical arm, surface flatness detection is performed. When microscopic unevenness is detected on the outer surface of the aluminum foil strip, an interface co-growth process based on "molecular anchoring grafting" and "in-situ solidification film formation" is used. After the aluminum foil surface is activated by plasma, a flexible micro-reaction chamber technology is used to control the temperature and humidity in a closed nitrogen-filled environment. A piezoelectric atomizing nozzle sprays a pre-hydrolyzed silane coupling agent solution, and the silicon alcohol group and the activated hydroxyl group on the aluminum foil form a covalent bond through a synergistic proton transfer mechanism. The solution concentration and standing time are controlled, and a laser interferometer is used to monitor the molecular self-assembly process in real time. The driving molecules diffuse and arrange themselves, and then the sprayed bifunctional monomer fills the microgap through capillary action and covalently grafts with the molecular anchor. After the three-dimensional network interface layer is formed by ultraviolet curing, it can reduce the interface thermal resistance and achieve passive cooling of the strain flow plate after forming a firm covalent bond with the radiation cooling film.

2. A radiative cooling film and methods of using same according to claim 1, wherein, The plasma activation uses low-temperature atmospheric plasma technology. High-activity particles in the plasma physically bombard and remove nanoscale pollutants. At the same time, active oxygen free radicals undergo oxidation on the aluminum foil surface to generate active sites rich in hydroxyl groups. Real-time spectroscopy is used to ensure consistency during the treatment process.

3. A radiant cooling film and method of use thereof according to claim 1, wherein, The capillary action is achieved by designing a monomer mixture with low surface tension and appropriate viscosity. The low surface tension and appropriate viscosity refer to the physicochemical parameters of the monomer mixture, which must meet the following conditions: it can only rely on capillary effect and controlled temperature gradient to autonomously fill and flow the microgap, thereby forming a uniform liquid film.

4. The radiative cooling film of claim 1, wherein, In S2, the aluminum foil is fastened. Aluminum foil is chosen as the film substrate because the strain flow plate is made of aluminum. The homogenous material properties of aluminum devices allow the aluminum foil with the film to be applied to the surface of the flow plate by shearing and pasting.

5. A radiant cooling film and method of use thereof according to claim 1, wherein, The multi-modal perception and thermal fault diagnosis of the strain flow plate specifically includes: fusing the temperature distribution data collected by the infrared thermal imager and the real-time load data obtained by the current sensor, and inputting the obtained real-time load data into the pre-trained thermal fault diagnosis model for analysis. The pre-trained thermal fault diagnosis model uses a double-flow convolutional neural network algorithm based on an attention mechanism, where the visual branch processes temperature field image features, the time sequence branch analyzes electrical parameter trends, and the thermal fault level score G and hot spot area positioning are output through feature fusion.

6. A radiant cooling film and method of use thereof according to claim 1, wherein, The "wisdom-cold shield" cooperative cooling system receives the geometric features of the hotspot area identified by the visual system, calls the optimal coverage algorithm in the path planning algorithm library, and automatically generates a mechanical arm winding path trajectory that can completely cover the hotspot area and adhere to the surface of the component without collision.

7. A radiant cooling film and method of use thereof according to claim 1, wherein, The synergistic proton transfer mechanism is the core microscopic mechanism of forming strong covalent bonds. The hydroxyl group on the surface of the aluminum foil acts as a weak acid, and in the presence of water molecules, it transfers its proton to the oxygen atom of the silanol group. A negatively charged alumina root is generated on the surface, while a positively charged silicon center is formed on the silanol group molecule. The strong nucleophile rapidly attacks the electrophilic silicon center, ultimately removing a molecule of water to form a Si-O-Al covalent bond.

8. The radiative cooling film of claim 1, wherein, The number of covering layers of the radiation cooling film in S2 is determined by the required total cooling power, the measured cooling power per unit area of the film, and the area to be covered. The calculation logic is as follows: first, calculate the equivalent number of layers required to meet the cooling demand, which is the total cooling power required divided by the product of the cooling power per unit area of the film and the area to be covered. Then, the calculation result of the equivalent number of layers is rounded up to determine the final number of covering layers.

9. A radiant cooling film according to claim 1 and its method of use, characterized by, The performance verification in S3 is to collect temperature data after cooling at a high frequency through a pre-buried distributed temperature sensor network or an infrared thermal imager scanned periodically to monitor the temperature drop rate and steady-state temperature value.

10. The radiative cooling film of claim 1, wherein, The parameter iteration in S3 is to collect temperature data of the drain plate during subsequent operation through fixedly installed wireless temperature sensors or regular unmanned aerial vehicle inspection, and encrypt and upload to the cloud platform or local data center, and bind and archive with the unique identity of the drain plate.

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