PCB circuit board anti-corrosion paint is a key material for ensuring the stable operation of circuits. However, during the automatic spraying process, uneven surface tension of the coating can easily lead to defects such as pinholes, blistering, orange peel effect, and edge and corner under-coating, resulting in incomplete coating coverage of the circuit solder joints and a significant reduction in moisture-proof and corrosion-resistant capabilities. Organic silicone leveling and defoaming modified silicone oil, as the core additives of anti-corrosion paint, optimize the coating application performance and enhance the overall protection level of the circuit.
Silicone oil additives can reduce the surface tension of the anti-corrosion coating system, and during spraying, the coating has excellent leveling ability. It automatically spreads on the circuit pins and the gaps of small components, eliminating brush marks and spray orange peel phenomena, forming a continuous and complete protective film. Defoaming silicone oil quickly eliminates air bubbles formed by stirring and high-pressure spraying of the coating, avoiding the appearance of pinholes after drying and preventing water vapor from eroding the copper foil of the circuit.
Through molecular modification design, it is possible to produce special silicone oil compatible with acrylic, polyurethane, and silicone anti-corrosion paints, without the problems of additive precipitation or coating fogging. Reasonable selection of silicone oil can also moderately improve the hydrophobic performance of the cured coating, strengthening the waterproof and salt spray resistance of the circuit board. In the flexible circuit FPC thin-layer anti-corrosion coating system, low addition amount of silicone oil does not affect the flexibility of the coating, and repeated bending is not prone to coating cracking.
The processing of circuit anti-corrosion requires extremely high cleanliness. Low ionic and low free molecular electronic-grade silicone oil must be selected to prevent the migration of additives from polluting the pads and affecting the rework and welding processes. Currently, the industrial control, energy storage, and vehicle electronic circuit application scenarios are becoming increasingly complex, with an increase in humid, salt spray, and dust environments. The anti-corrosion standards for circuits are continuously upgrading, and the market prospect for modified silicone oil suitable for anti-corrosion coatings is broad, continuously helping various electronic circuits achieve long-term and reliable protection.