Process preparation involves two key aspects: first, purifying and cleaning unpainted products by removing dust and oil; second, preparing the paint mixture. Begin by inspecting whether the impregnation insulation漆 used in electronic transformers meets quality standards, then mix it with a suitable diluent according to the viscosity specified in the impregnation process. Typically, the first coat is applied using a #4 viscosity cup, allowing approximately 20 seconds of coating time at 25°C. The second impregnation step lasts about 30 seconds. After these steps, the product undergoes pre-baking to remove moisture from the iron core and coils, enhancing paint penetration. The ideal pre-drying temperature ranges between 100°C and 130°C, while the pre-drying duration should account for both the product’s heat absorption and the quantity being dried—usually around 1 hour. What is its function? How is the process handled?

　　I. The Purpose of Using Electronic Transformer Insulating Varnish

　　1. Enhance electrical insulation performance

　　It can enhance the electrical strength and insulation resistance of the transformer's insulation system, meeting the requirements for the transformer's electrical insulation performance.

　　2. Enhance Environmental Adaptability

　　It can enhance the transformer's insulation system against harmful elements such as moisture, mold, corrosion, salt spray, and UV radiation, thereby improving the electronic transformer's ability to adapt to its environment.

　　3. Enhance mechanical strength

　　It can enhance the mechanical strength of the transformer, ensuring it meets the vibration and shock requirements during transportation and operation. At the same time, it also helps reduce noise caused by electromagnetic forces during use.

　　4. Enhance thermal conductivity

　　The air gap between the iron core and the windings is filled with a varnish film, which enhances the transformer's overall thermal conductivity and helps reduce its temperature rise.

　　5. Enhance the appearance of electronic transformers.

　　II. Five Process Treatments for Insulating Varnish in Electronic Transformers:

　　1. Continuous Immersion Process

　　The continuous impregnation process combines automated continuous production with the traditional atmospheric-pressure impregnation method, enabling efficient and convenient automated, continuous operation for product insulation treatment via impregnation.

　　2. Drip Filtration Process

　　The drip-dip process involves dripping paint onto a rotating workpiece, where gravity and capillary action allow the paint to penetrate deep into the product before being cured by heat. Compared to conventional dip-coating processes, drip-dip offers several advantages: it allows for higher paint coverage with minimal waste, reduces energy consumption, lowers labor intensity, boosts production output, and eliminates the need for hanging racks altogether.

　　3. Atmospheric Pressure Dipping Coating Process

　　Process preparation involves two key aspects: first, purifying and cleaning unpainted products by removing dust and oil; second, preparing the paint mixture. Begin by inspecting whether the impregnation insulation漆 used in electronic transformers meets quality standards, then mix it with a suitable diluent according to the viscosity specified in the impregnation process. Typically, the first coat is applied using a #4 viscosity cup, allowing approximately 20 seconds of coating time at 25°C. The second impregnation step lasts about 30 seconds. After these steps, the product undergoes pre-baking to remove moisture from the iron core and coils, facilitating better paint penetration. The ideal pre-drying temperature ranges between 100°C and 130°C, while the pre-drying duration should account for both the product’s heat absorption and the quantity being dried—usually around 1 hour.

　　It is recommended to wait until the product cools naturally to between 50 and 70°C. Maintaining the workpiece at this temperature range can help reduce the viscosity of the paint, making it easier for the paint to penetrate effectively. However, if the product temperature drops below 45°C, it may absorb moisture. Conversely, if the product is too hot, it could compromise the stability of the paint. Typically, the soaking time should be kept between 10 and 20 minutes—ideally, ensuring no bubbles form on the surface of the product.

　　4. Photothermal Curing Dipping Varnish Process

　　During this process, the surface of the painted workpiece is first cured using UV radiation, followed by curing the inner layer through heat. Compared to conventional dip coatings, this method eliminates material loss during the baking and curing stage, resulting in both material savings and improved product quality—while also reducing environmental pollution.

5. Vacuum impregnation and vacuum pressure impregnation processes

　　For compact transformer products, vacuum impregnation and vacuum-pressure impregnation are commonly used to enhance the quality of varnish coating. These processes follow similar procedures to conventional pressure impregnation, but the key difference lies in replacing atmospheric-pressure impregnation with either pure vacuum impregnation or vacuum impregnation followed by a few additional atmospheres of pressure. This ensures that the paint penetrates more effectively into the iron core and windings, ultimately improving the quality of the insulation treatment.