Environment-friendly siloxane oil capacitor metallized film and preparation method thereof

Abstract

The invention discloses an environment-friendly siloxane oil capacitor metallized film and a preparation method thereof, and relates to the technical field of capacitor films, the capacitor metallized film is composed of the following materials: environment-friendly siloxane oil, a polypropylene film and a polyester film; the capacitor metallized film comprises a film layer, a metal layer is electroplated on the film layer, the edges of the film layer and the metal layer are provided with insulating edges, and the environment-friendly siloxane oil is coated on the insulating edges of the capacitor metallized film. Through real-time oil injection parameter adjustment and accurate temperature control, insulation edge uniformity is ensured, manual intervention is reduced through an automatic adjustment mechanism, production continuity is greatly improved, leakage, equipment fault risks and guarding personnel and equipment safety are comprehensively reduced from oil storage tank sealing to equipment parameter inspection to leakage-proof device detection, environment-friendly raw materials are selected, and the production efficiency is improved. Resource waste is reduced, a green production concept is practiced, and a reliable path is provided for capacitor metallized film production.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor films, and in particular to an environmentally friendly silicone oil capacitor metallized film and a preparation method thereof. Background Art

[0002] As a key component in electronic devices, capacitors are widely used in power systems, new energy vehicles, and smart terminals. Their performance directly affects the stability and service life of electronic devices. Traditional capacitor metallized films mostly use a mineral oil impregnation process, but mineral oil has defects such as difficulty in biodegradation, high risk of environmental pollution, and poor temperature resistance. It is prone to oxidative decomposition under high temperature or long-term operating conditions, resulting in a decrease in the insulation performance of the capacitor and even causing safety accidents. With increasingly stringent environmental regulations and the trend towards miniaturization and high performance of electronic devices, the development of environmentally friendly capacitor metallized films has become a focus of industry research.

[0003] In existing technologies, silicone oil is considered an ideal substitute for mineral oil due to its excellent electrical insulation properties, high temperature resistance, biodegradability, and low toxicity. However, the application of silicone oil in the preparation of capacitor metallization films still faces many technical challenges:

[0004] The viscosity and surface tension properties of silicone oil differ significantly from those of mineral oil. Traditional impregnation processes make it difficult to ensure its uniform distribution within the film, which can easily lead to inconsistent insulation thickness and localized electric field concentration, impacting the capacitor's withstand voltage and service life. Film surface quality control is difficult: During film production, the evaporation and curing of silicone oil are extremely sensitive to temperature and pressure process parameters. Minor parameter fluctuations can lead to uneven brightness and thickness deviations on the insulation edge, reducing product yield. The production process is also unstable: Existing equipment and processes have deficiencies in vacuum control, oil supply system sealing, and film tension stability, which can easily lead to oil and air leaks, and film wrinkles, impacting production efficiency and product quality consistency. To address this, we propose an environmentally friendly silicone oil capacitor metallization film and its preparation method. Summary of the Invention

[0005] In order to solve the above technical problems, an environmentally friendly silicone oil capacitor metallized film and a preparation method thereof are provided. This technical solution solves the above problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: an environmentally friendly silicone oil capacitor metallized film, wherein the capacitor metallized film is composed of the following materials: environmentally friendly silicone oil, polypropylene film and polyester film; the capacitor metallized film includes a film layer, a metal layer electroplated on the film layer, wherein the edges of the film layer and the metal layer are provided with insulating edges, and the environmentally friendly silicone oil is applied to the insulating edges of the capacitor metallized film.

[0007] Preferably, the environmentally friendly silicone oil includes linear silicone oil and branched silicone oil.

[0008] Preferably, the polypropylene film is prepared based on a melt extrusion method, wherein the raw materials are dried, melt extruded, biaxially stretched and heat-set, and the raw materials include polypropylene resin and additives;

[0009] The polyester film is produced based on the biaxial stretching method, which involves drying the raw materials, high-temperature melt extrusion, biaxial stretching and heat setting. The raw materials include polyethylene terephthalate and functional additives.

[0010] A method for preparing an environmentally friendly silicone oil capacitor metallized film, the preparation steps are as follows:

[0011] S1. Raw material preparation and storage: Add environmentally friendly silicone oil to the oil storage tank through the delivery pipeline; during the addition process, monitor the liquid level in the oil storage tank in real time and seal the oil storage tank;

[0012] S2. Start the vacuum system of the entire equipment and evacuate the equipment. During the evacuation process, pay attention to the changes in the value of the vacuum pressure gauge. When the vacuum degree stabilizes at ≤4.0×0.0001mbar, check various equipment parameters, including temperature, pressure, and speed. After the parameters are normal, start the equipment gradually.

[0013] S3. Install the polypropylene film and the polyester film on the unwinding device respectively, adjust the tension control system of the unwinding device to keep the film at a constant tension during the unwinding process, and perform unwinding and rewinding;

[0014] S4. After the equipment is running stably, start the oil supply device outside the vacuum, control the oil supply speed and flow, and monitor the pressure in the oil supply pipeline in real time;

[0015] S5. Before starting the oil supply device, check the oil and gas leakage prevention devices;

[0016] S6, using a speed sensor to monitor the movement speed of the film in real time, transmitting the speed signal to the control system, and the control system adjusting the nozzle opening and injection pressure parameters of the injection device based on a preset program and algorithm;

[0017] S7. Set the temperature control range of the high-temperature evaporation source. Based on the material, thickness and production process requirements of the film, the temperature is controlled within the set range. When the temperature exceeds the set range, the control system automatically adjusts the temperature within the preset range to form an environmentally friendly silicone oil capacitor metallized film with consistent insulation edge size and brightness.

[0018] Preferably, in step S1, the liquid level in the oil storage tank is dually monitored based on an ultrasonic level meter and a magnetic flap level meter. The ultrasonic level meter transmits the liquid level data to the system in real time. When the liquid level reaches 80% of the oil storage tank capacity, an early warning is automatically issued to remind the operator to suspend transportation.

[0019] The magnetic flap level gauge provides intuitive on-site liquid level display;

[0020] After the oil is added, the oil tank is sealed by installing a double-layer fluororubber sealing ring and a breathing valve on the top of the oil tank to balance the pressure inside and outside the tank.

[0021] Preferably, the specific steps of vacuuming the equipment in step S2 are:

[0022] Before vacuuming, check all components of the vacuum system, calibrate the instruments, and confirm that the valves are in normal condition;

[0023] Start the vacuum pump and start primary exhaust in advance. Wait for the vacuum degree to reach 1mbar and maintain it for 5-10 minutes to remove the air.

[0024] Switch to deep vacuum mode, continuously monitor the value, and maintain the vacuum level for 15-30 minutes when it stabilizes at ≤4.0×0.0001mbar to complete deep vacuuming.

[0025] After vacuuming is completed, close the valve and check for tightness.

[0026] Preferably, the specific steps of inspecting the oil and gas leakage prevention device in step S5 are:

[0027] Check whether there are cracks and aging problems on the seals of the oil storage tanks, and check whether the pipes are bent and corroded;

[0028] Check the air tightness by filling the system with low-pressure nitrogen, applying soapy water to the pipe joints, and observing the bubbles to determine the leak point;

[0029] Perform functional tests, including pressure and vacuum maintenance tests. The pressure maintenance test is performed by increasing the system pressure to 1.1 times the working pressure and maintaining it for 30 minutes, with the pressure drop controlled within 0.5%;

[0030] The vacuum maintenance test evacuates the vacuum chamber to the specified value, maintains the pressure for 15 minutes, and tests the sealing performance of the device.

[0031] Preferably, the step of adjusting the nozzle opening and injection pressure parameters of the fuel injection device in step S6 is:

[0032] The speed sensor collects the film speed signal and transmits it to the control system after filtering and calibration;

[0033] Based on the preset parameter library and PID algorithm, the compensation value of the injector opening and pressure is calculated in combination with the real-time speed. The motor and solenoid valve drive the actuator to adjust the injector opening and fuel supply pressure.

[0034] During the adjustment process, the injection effect is verified every 30 seconds. If the injection effect deviation exceeds 5%, the parameters are automatically corrected.

[0035] Preferably, when adjusting the nozzle opening and the fuel supply pressure, the difference between the real-time speed of the membrane and the reference speed is determined, and based on the reference speed difference, the compensation value for adjusting the nozzle opening is calculated using proportional, integral and differential parameters;

[0036] The proportional parameter gives the adjustment amount based on the current speed deviation; the integral parameter accumulates all past speed deviations to eliminate long-term errors; the differential parameter is adjusted in advance according to the speed deviation change trend;

[0037] After obtaining the nozzle opening compensation value, the fuel supply pressure compensation value is calculated by combining the pressure coefficient with the pressure-related proportional, integral, and differential parameters;

[0038] Add the pressure compensation value to the basic injection pressure to obtain the actual fuel supply pressure and adjust the injector opening.

[0039] Preferably, the temperature detection in step S7 adopts a dual monitoring mechanism, which collects data in real time based on high-precision thermocouples and infrared thermometers, and transmits it to the control system after filtering. When the temperature deviates, the system responds in stages. For small deviations, the power is fine-tuned through the PID algorithm; for medium deviations, the film conveying is suspended and the adjustment force is increased; for large abnormal deviations, the power is cut off and an alarm is issued.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention ensures uniform insulation edges through real-time adjustment of oil injection parameters and precise temperature control, and combines with constant film tension control to improve electrical performance and stability. In terms of efficiency, each step is automatically connected, the vacuum system starts quickly, and the oil supply is stable. The automatic adjustment mechanism reduces manual intervention and greatly improves production continuity. From oil tank sealing to equipment parameter inspection and leak-proof device detection, the risks of leakage and equipment failure are comprehensively reduced, protecting personnel and equipment safety. Environmentally friendly raw materials are selected to reduce resource waste, practice green production concepts, provide a reliable path for capacitor metallized film production, and promote sustainable development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The figure is a flow chart of the preparation steps of the present invention. DETAILED DESCRIPTION

[0043] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0044] An environmentally friendly silicone oil capacitor metallized film is composed of the following materials: 100-1200 parts of environmentally friendly silicone oil, 90-500 parts of polypropylene film, and 10-670 parts of polyester film. The capacitor metallized film includes a film layer, a metal layer electroplated on the film layer, wherein an insulating edge is provided at the edge of the film layer and the metal layer, and the environmentally friendly silicone oil is applied to the insulating edge of the capacitor metallized film.

[0045] This application uses environmentally friendly silicone oil as the core ingredient, with a wide range of proportions, which can be flexibly adjusted to meet different performance requirements. Its excellent insulation, high and low temperature resistance and chemical stability can effectively improve the electrical insulation performance of the film; the proportions of the three materials can be flexibly adjusted according to the actual application scenarios; the use of environmentally friendly silicone oil reduces the use of harmful substances, which is in line with the green production concept.

[0046] Environmentally friendly silicone oils include linear silicone oils and branched silicone oils.

[0047] The multi-faceted combination of rings in this application brings many advantages to the performance improvement and application expansion of capacitor metallized films. From the perspective of performance complementarity, linear silicone oil has a regular molecular chain and good fluidity and diffusivity, which is conducive to uniform film formation on the film surface and reduces dielectric loss; branched silicone oil, due to its unique molecular structure, can enhance intermolecular forces and improve the flexibility and impact resistance of the film.

[0048] The polypropylene film is prepared based on the melt extrusion method, which involves drying the raw materials, melt extruding, biaxially stretching and heat setting. The raw materials include polypropylene resin and additives.

[0049] The polyester film is produced based on the biaxial stretching method, which involves drying the raw materials, high-temperature melt extrusion, biaxial stretching and heat setting. The raw materials include polyethylene terephthalate and functional additives.

[0050] The polypropylene film of the present application is melt-extruded and biaxially stretched to improve the molecular orientation, thereby enhancing its mechanical strength, dimensional stability and dielectric properties; the polyester film is biaxially stretched and high-temperature treated to highly oriented molecular chains, and has high strength, high transparency and good heat resistance.

[0051] Reference Figure 1 As shown, a method for preparing an environmentally friendly silicone oil capacitor metallized film, the preparation steps are:

[0052] S1. Raw material preparation and storage: Add environmentally friendly silicone oil to the oil storage tank through the delivery pipeline; during the addition process, monitor the liquid level in the oil storage tank in real time and seal the oil storage tank;

[0053] S2. Start the vacuum system of the entire equipment and evacuate the equipment. During the evacuation process, pay attention to the changes in the value of the vacuum pressure gauge. When the vacuum degree stabilizes at ≤4.0×0.0001mbar, check various equipment parameters, including temperature, pressure, and speed. After the parameters are normal, start the equipment gradually.

[0054] S3. Install the polypropylene film and the polyester film on the unwinding device respectively, adjust the tension control system of the unwinding device to keep the film at a constant tension during the unwinding process, and perform unwinding and rewinding;

[0055] S4. After the equipment is running stably, start the oil supply device outside the vacuum, control the oil supply speed and flow, and monitor the pressure in the oil supply pipeline in real time;

[0056] S5. Before starting the oil supply device, check the oil and gas leakage prevention devices;

[0057] S6, using a speed sensor to monitor the movement speed of the film in real time, transmitting the speed signal to the control system, and the control system adjusting the nozzle opening and injection pressure parameters of the injection device based on a preset program and algorithm;

[0058] S7. Set the temperature control range of the high-temperature evaporation source. Based on the material, thickness and production process requirements of the film, the temperature is controlled within the set range. When the temperature exceeds the set range, the control system automatically adjusts the temperature within the preset range to form an environmentally friendly silicone oil capacitor metallized film with consistent insulation edge size and brightness.

[0059] This application ensures uniform insulation edges through real-time adjustment of oil injection parameters and precise temperature control, and combines with constant film tension control to improve electrical performance and stability. In terms of efficiency, each step is automatically connected, the vacuum system starts quickly, and the oil supply is stable. The automatic adjustment mechanism reduces manual intervention and greatly improves production continuity. In terms of safety, from oil tank sealing to equipment parameter inspection, to leak-proof device detection, the risks of leakage and equipment failure are comprehensively reduced to protect personnel and equipment safety. In terms of environmental performance, environmentally friendly raw materials are selected, emissions are strictly controlled, resource waste is reduced, and the concept of green production is practiced. This method takes into account quality, efficiency, safety and environmental protection, provides a reliable path for the production of capacitor metallized films, and promotes the sustainable development of the industry.

[0060] In step S1, the liquid level in the oil storage tank is monitored by both an ultrasonic level meter and a magnetic flap level meter. The ultrasonic level meter transmits the liquid level data to the system in real time. When the liquid level reaches 80% of the oil storage tank capacity, an alarm is automatically issued to remind the operator to suspend transportation.

[0061] The magnetic flap level gauge provides intuitive on-site liquid level display;

[0062] After the oil is added, the oil tank is sealed by installing a double-layer fluororubber sealing ring and a breathing valve on the top of the oil tank to balance the pressure inside and outside the tank.

[0063] In step S1 of this application, dual liquid level monitoring and composite sealing treatment are used to provide protection for the storage of environmentally friendly silicone oil in terms of safety, precision, stability and other aspects. Dual liquid level monitoring realizes redundant safety and precise control: the ultrasonic liquid level meter has real-time data transmission and intelligent early warning functions. When the liquid level reaches 80% of the capacity, it will automatically alarm, which can effectively prevent oil overflow and avoid environmental pollution and safety hazards; the magnetic flap liquid level meter provides intuitive on-site visual readings, which is convenient for operators to quickly check data. The two devices complement each other and reduce the risk of monitoring failure due to failure of a single instrument.

[0064] The specific steps for vacuuming the equipment in step S2 are:

[0065] Before vacuuming, check all components of the vacuum system, calibrate the instruments, and confirm that the valves are in normal condition;

[0066] Start the vacuum pump and start primary exhaust in advance. Wait for the vacuum degree to reach 1mbar and maintain it for 5-10 minutes to remove the air.

[0067] Switch to deep vacuum mode, continuously monitor the value, and maintain the vacuum level for 15-30 minutes when it stabilizes at ≤4.0×0.0001mbar to complete deep vacuuming.

[0068] After vacuuming is completed, close the valve and check for tightness.

[0069] This application lays a solid foundation for production from multiple aspects including equipment guarantee, pumping efficiency, vacuum quality and system stability. Before pumping, all system components are inspected, instruments are calibrated and valve status is confirmed. The phased pumping strategy significantly improves the pumping efficiency and quality. In the primary pumping stage, the vacuum degree is quickly pumped to 1 mbar and maintained for 5-10 minutes, which can effectively expel most of the air in the system and reduce the burden of subsequent deep pumping.

[0070] The specific steps for checking the oil and gas leakage prevention device in step S5 are as follows:

[0071] Check whether there are cracks and aging problems on the seals of the oil storage tanks, and check whether the pipes are bent and corroded;

[0072] Check the air tightness by filling the system with low-pressure nitrogen, applying soapy water to the pipe joints, and observing the bubbles to determine the leak point;

[0073] Perform functional tests, including pressure and vacuum maintenance tests. The pressure maintenance test is performed by increasing the system pressure to 1.1 times the working pressure and maintaining it for 30 minutes, with the pressure drop controlled within 0.5%;

[0074] The vacuum maintenance test evacuates the vacuum chamber to the specified value, maintains the pressure for 15 minutes, and tests the sealing performance of the device.

[0075] The appearance and mechanical inspection of this application can intuitively detect the potential risks of seal aging and pipeline corrosion, avoid oil / gas leakage caused by component damage, and eliminate safety hazards at the source; the soapy water leak detection method combined with low-pressure nitrogen filling can quickly locate the leak point in a low-cost and high-sensitivity manner, which is especially suitable for the preliminary investigation of small leaks; the pressure holding test simulates an overpressure environment to verify the sealing of the system under extreme working conditions, and the pressure drop is controlled within 0.5%.

[0076] The steps for adjusting the nozzle opening and injection pressure parameters of the fuel injection device in step S6 are as follows:

[0077] The speed sensor collects the film speed signal and transmits it to the control system after filtering and calibration;

[0078] Based on the preset parameter library and PID algorithm, the compensation value of the injector opening and pressure is calculated in combination with the real-time speed. The motor and solenoid valve drive the actuator to adjust the injector opening and fuel supply pressure.

[0079] During the adjustment process, the injection effect is verified every 30 seconds. If the injection effect deviation exceeds 5%, the parameters are automatically corrected.

[0080] After the speed sensor of the present application collects the film speed signal, it is transmitted to the control system after filtering and calibration, which can effectively remove interference, ensure the accuracy of the input data, provide a reliable basis for subsequent parameter adjustment, and avoid inaccurate injection parameters due to signal errors; using the preset parameter library and PID algorithm, combined with the real-time speed calculation compensation value, the injector opening and pressure can be adjusted quickly and accurately according to the changes in film speed.

[0081] When adjusting the nozzle opening and fuel supply pressure, the difference between the real-time speed of the film and the reference speed is determined. Based on the reference speed difference, the proportional, integral and differential parameters are used to calculate the compensation value for adjusting the nozzle opening.

[0082] The proportional parameter gives the adjustment amount based on the current speed deviation; the integral parameter accumulates all past speed deviations to eliminate long-term errors; the differential parameter is adjusted in advance according to the speed deviation change trend;

[0083] After obtaining the nozzle opening compensation value, the fuel supply pressure compensation value is calculated by combining the pressure coefficient with the pressure-related proportional, integral, and differential parameters;

[0084] Add the pressure compensation value to the basic injection pressure to obtain the actual fuel supply pressure and adjust the injector opening.

[0085] This application is based on the difference between the real-time speed of the film and the reference speed, and combines proportional, integral and differential parameters for calculation. It can respond quickly and accurately to changes in film speed. The proportional parameter is adjusted instantly based on the current deviation to ensure that the system responds quickly; the integral parameter accumulates historical errors to eliminate long-term minor deviations caused by equipment wear and environmental changes.

[0086] The temperature detection in step S7 adopts a dual monitoring mechanism, which collects data in real time based on high-precision thermocouples and infrared thermometers. The data is transmitted to the control system after filtering. When the temperature deviates, the system responds in stages. For small deviations, the power is fine-tuned through the PID algorithm; for medium deviations, the film conveying is suspended and the adjustment force is increased; for large abnormal deviations, the power is cut off and an alarm is issued.

[0087] The dual temperature monitoring and graded response mechanism adopted in step S7 of this application provides strong guarantees for the temperature control of the high-temperature evaporation source in terms of monitoring accuracy, system stability, equipment and product protection. The dual monitoring mechanism combines high-precision thermocouples with infrared thermometers to achieve data complementarity and redundancy: the thermocouples directly measure in contact and can accurately obtain the temperature of the core area of ​​the evaporation source, while the infrared thermometer monitors the surface temperature in a non-contact manner. The data of the two are transmitted to the control system after filtering, effectively avoiding errors caused by failure of a single monitoring device or measurement blind spots, and ensuring that the temperature data is true and reliable.

[0088] Specific cases

[0089] In actual production, a capacitor manufacturer has successfully used this process to produce environmentally friendly silicone oil capacitor metallized film. The company slowly adds environmentally friendly silicone oil to a special oil storage tank through a corrosion-resistant stainless steel pipeline. A magnetic flap level gauge clearly displays the on-site liquid level, facilitating inspection by patrol personnel.

[0090] Before vacuuming, technicians carefully checked all components of the vacuum system, calibrated the vacuum pressure gauge, ensured that the valves were open and closed normally, started the vacuum pump, and first entered the primary vacuuming mode. After 30 minutes, the vacuum level reached 1 mbar and was maintained for 8 minutes to fully remove the air. Then, the system switched to the deep vacuuming mode and continuously monitored the vacuum level.

[0091] The company uses a high-precision unwinding device, installing polypropylene film and polyester film at different workstations. The tension control system, consisting of a tension sensor and a servo motor, monitors and adjusts the film tension in real time. The tension is set at 15N. During the unwinding process, the tension fluctuation is always controlled within ±0.5N, ensuring that the film enters the subsequent process flat and wrinkle-free.

[0092] After the equipment has been running stably for 10 minutes, start the gear pump outside the vacuum as the oil supply device. By adjusting the frequency of the inverter to control the pump speed, the oil supply speed and flow rate are precisely controlled. The flow rate is set to 5L / min, and the error is controlled within ±0.1L / min. A pressure sensor is installed in the oil supply pipeline, and pressure data is collected every 10 seconds to ensure that the pipeline pressure is stable at 0.3MPa.

[0093] Before starting the oil supply device, workers used an endoscope to inspect the oil tank seals and found no cracks or signs of aging. A comprehensive visual inspection of the pipeline revealed no bends or corrosion. During the air tightness test, 0.05MPa low-pressure nitrogen was injected and soapy water was applied to the pipeline joints. No bubbles were observed. The pressure holding test increased the system pressure to 1.1 times the operating pressure, or 0.33MPa, and maintained it for 30 minutes. The pressure dropped by only 0.2%. The vacuum maintenance test evacuated the vacuum chamber to the specified value and maintained it for 15 minutes. The pressure remained almost unchanged, indicating that the device had good sealing performance.

[0094] The speed sensor collects film speed signals at a frequency of 100Hz, which are then transmitted to the control system after dual calibration using a hardware filter circuit and a software algorithm. Based on a preset parameter library and a PID algorithm, when the film speed is 120m / min, the nozzle opening compensation value is calculated to be 0.05mm, and the pressure compensation value is 0.03MPa. These are adjusted by the actuator driven by a motor and a solenoid valve. The injection effect is verified every 30 seconds using a machine vision system. If the deviation exceeds 5%, the system automatically corrects the parameters to ensure uniform injection.

[0095] The high-temperature evaporation source uses dual temperature monitoring, and high-precision thermocouples and infrared thermometers collect data in real time. The system fine-tunes the heating power through the PID algorithm to ensure production safety and film quality. Ultimately, it successfully produced an environmentally friendly silicone oil capacitor metallized film with consistent insulation edge size and brightness. The product performance has been tested and fully meets the standards for use in high-end capacitors.

[0096] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. An environmentally friendly silicone oil capacitor metallized film, characterized in that: The capacitor metallized film is composed of the following materials: environmentally friendly silicone oil, polypropylene film and polyester film; the capacitor metallized film includes a film layer, a metal layer electroplated on the film layer, wherein the film layer and the metal layer have insulating edges, and the environmentally friendly silicone oil is applied to the insulating edges of the capacitor metallized film.

2. The environmentally friendly silicone oil capacitor metallization film according to claim 1, characterized in that: Environmentally friendly silicone oils include linear silicone oils and branched silicone oils.

3. The environmentally friendly silicone oil capacitor metallization film according to claim 1, characterized in that: Polypropylene film is prepared based on the melt extrusion method, which involves drying the raw materials, melt extruding, biaxially stretching and heat setting. Raw materials include polypropylene resin and additives; The polyester film is produced based on the biaxial stretching method, which involves drying the raw materials, high-temperature melt extrusion, biaxial stretching and heat setting. The raw materials include polyethylene terephthalate and functional additives.

4. A method for preparing an environmentally friendly silicone oil capacitor metallized film, characterized in that: The preparation steps are: S1. Raw material preparation and storage: Add environmentally friendly silicone oil to the oil storage tank through the delivery pipeline; during the addition process, monitor the liquid level in the oil storage tank in real time and seal the oil storage tank; S2. Start the vacuum system of the entire equipment and evacuate the equipment. During the evacuation process, pay attention to the changes in the value of the vacuum pressure gauge. When the vacuum degree stabilizes at ≤4.0×0.0001mbar, check various equipment parameters, including temperature, pressure, and speed. After the parameters are normal, start the equipment gradually; S3. Install the polypropylene film and the polyester film on the unwinding device respectively, adjust the tension control system of the unwinding device to keep the film at a constant tension during the unwinding process, and perform unwinding and rewinding; S4. After the equipment is running stably, start the oil supply device outside the vacuum, control the oil supply speed and flow, and monitor the pressure in the oil supply pipeline in real time; S5. Before starting the oil supply device, check the oil and gas leakage prevention devices; S6, using a speed sensor to monitor the movement speed of the film in real time, transmitting the speed signal to the control system, and the control system adjusting the nozzle opening and injection pressure parameters of the injection device based on a preset program and algorithm; S7. Set the temperature control range of the high-temperature evaporation source. Based on the material, thickness and production process requirements of the film, the temperature is controlled within the set range. When the temperature exceeds the set range, the control system automatically adjusts the temperature within the preset range to form an environmentally friendly silicone oil capacitor metallized film with consistent insulation edge size and brightness.

5. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 4, characterized in that: In step S1, the liquid level in the oil storage tank is monitored by both an ultrasonic level meter and a magnetic flap level meter. The ultrasonic level meter transmits the liquid level data to the system in real time. When the liquid level reaches 80% of the oil storage tank capacity, an alarm is automatically issued to remind the operator to suspend transportation. The magnetic flap level gauge provides intuitive on-site liquid level display; After the oil is added, the oil tank is sealed by installing a double-layer fluororubber sealing ring and a breathing valve on the top of the oil tank to balance the pressure inside and outside the tank.

6. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 4, characterized in that: The specific steps for vacuuming the equipment in step S2 are: Before vacuuming, check all components of the vacuum system, calibrate the instruments, and confirm that the valves are in normal condition; Start the vacuum pump and start primary exhaust in advance. Wait for the vacuum degree to reach 1mbar and maintain it for 5-10 minutes to remove the air. Switch to deep vacuum mode, continuously monitor the value, and maintain the vacuum level for 15-30 minutes when it stabilizes at ≤4.0×0.0001mbar to complete deep vacuuming. After vacuuming is completed, close the valve and check for tightness.

7. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 4, characterized in that: The specific steps for checking the oil and gas leakage prevention device in step S5 are as follows: Check whether there are cracks and aging problems on the seals of the oil storage tanks, and check whether the pipes are bent and corroded; Check the air tightness by filling the system with low-pressure nitrogen, applying soapy water to the pipe joints, and observing the bubbles to determine the leak point; Perform functional tests, including pressure and vacuum maintenance tests. The pressure maintenance test is performed by increasing the system pressure to 1.1 times the working pressure and maintaining it for 30 minutes, with the pressure drop controlled within 0.5%; The vacuum maintenance test evacuates the vacuum chamber to the specified value, maintains the pressure for 15 minutes, and tests the sealing performance of the device.

8. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 4, characterized in that: The steps for adjusting the nozzle opening and injection pressure parameters of the fuel injection device in step S6 are as follows: The speed sensor collects the film speed signal and transmits it to the control system after filtering and calibration; Based on the preset parameter library and PID algorithm, the compensation value of the injector opening and pressure is calculated in combination with the real-time speed. The motor and solenoid valve drive the actuator to adjust the injector opening and fuel supply pressure. During the adjustment process, the injection effect is verified every 30 seconds. If the injection effect deviation exceeds 5%, the parameters are automatically corrected.

9. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 8, characterized in that: When adjusting the nozzle opening and fuel supply pressure, the difference between the real-time speed of the film and the reference speed is determined. Based on the reference speed difference, the proportional, integral and differential parameters are used to calculate the compensation value for adjusting the nozzle opening. The proportional parameter gives the adjustment amount based on the current speed deviation; The integral parameter accumulates all past speed deviations to eliminate long-term errors; the differential parameter is adjusted in advance according to the speed deviation change trend; After obtaining the nozzle opening compensation value, the fuel supply pressure compensation value is calculated by combining the pressure coefficient with the pressure-related proportional, integral, and differential parameters; Add the pressure compensation value to the basic injection pressure to obtain the actual fuel supply pressure and adjust the injector opening.

10. The method for preparing an environmentally friendly silicone oil capacitor metallized film according to claim 4, characterized in that: The temperature detection in step S7 adopts a dual monitoring mechanism, which collects data in real time based on high-precision thermocouples and infrared thermometers. The data is transmitted to the control system after filtering. When the temperature deviates, the system responds in stages. For small deviations, the power is fine-tuned through the PID algorithm; for medium deviations, the film conveying is suspended and the adjustment force is increased; for large abnormal deviations, the power is cut off and an alarm is issued.

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