Shanghai Yangmi's ultrasonic spraying technology for alumina solution on PE (polyethylene) and polypropylene (PP) films utilizes ultrasonic atomization to transform an alumina precursor solution into ultrafine droplets, which are then uniformly deposited onto the surface of the film substrate. Subsequent curing processes form a dense and uniform functional alumina coating, thereby enhancing the core properties of PE and PP films, such as barrier properties, scratch resistance, and high-temperature resistance. This technology combines the advantages of ultrasonic fine atomization with the superior characteristics of inorganic alumina coatings, overcoming the shortcomings of traditional spray coatings, such as uneven coating and significant material waste, while also addressing the functional deficiencies of virgin PE/PP films.
Advantages of ultrasonic spraying technology:
1. Optimizes coating unevenness and weak coating adhesion;
2. Ultrasonic atomization produces a uniform coating with a uniformity of >90%, avoiding problems such as coating cracking and pinholes;
3. Precise coating thickness ensures stable product performance and extends service life;
Application Scenarios:
1. Electronic Component Protection
Modified films can be used for moisture-proof packaging of electronic components (such as chips and capacitors). The high barrier properties of the alumina coating effectively prevent moisture intrusion that could lead to short circuits or component failure. Simultaneously, the coating possesses good insulation and scratch resistance, protecting the component surface from damage. Compared to traditional moisture-proof packaging materials (such as aluminum foil composite films), modified PE/PP films are thinner, lighter, and more flexible, facilitating automated packaging.
2. New Energy Battery Industry
PP film is the core substrate of lithium battery separators. Modification through ultrasonic spraying with an alumina solution improves the separator's high-temperature resistance (preventing short circuits caused by thermal shrinkage), electrolyte wettability, and mechanical strength, thereby enhancing battery cycle life and safety. The alumina coating prepared by ultrasonic spraying technology has a uniform thickness, allowing for precise control of separator porosity without affecting ion conduction efficiency.
The application technology of ultrasonic spraying alumina solution on PE/PP films will develop in three directions: First, low energy consumption and high efficiency, by optimizing the structure of ultrasonic transducers (such as using piezoelectric ceramic materials) to improve energy utilization and reduce equipment energy consumption; and by developing continuous production lines to achieve integrated spraying, curing, and testing, thereby improving production efficiency. Second, multifunctional composites, by adding nanomaterials such as graphene and titanium dioxide to alumina solutions to prepare composite coatings with multiple functions such as barrier, antibacterial, and UV protection, expanding application scenarios. Third, green and low-cost, by developing water-based alumina precursors (to replace alcohol-soluble precursors) to further reduce VOC emissions; optimizing solution formulations to reduce the amount of precious metal dispersants and lower raw material costs; and developing pretreatment-free spraying technology to simplify the process and reduce production energy consumption.
