The manufacturing of electronic circuits is developing towards miniaturization, high density, and high integration. PCB (Printed Circuit Board) printed circuits, flexible circuits FPC, and circuit modules are constantly facing risks such as moisture-induced leakage, electrochemical corrosion, dust-induced short circuits, and performance degradation under high and low temperature environments. Various silicone oils, silicone resins, and silicone-modified coating additives play a crucial role in the protection, impregnation, and coating processes of circuit substrates, becoming indispensable functional materials for ensuring circuit reliability.
During the production of circuit boards, low-viscosity insulating silicone oil can be used for the impregnation treatment of semi-finished circuit boards, penetrating the fine gaps of the circuits, forming a continuous insulating protective film on the copper foil and circuit substrate surfaces, isolating moisture, salt fog, and corrosive gases, and preventing copper circuits from oxidizing, generating copper green, and causing leakage hazards. Compared with ordinary oily protective agents, silicone oil has excellent temperature resistance, is not prone to solidification at low temperatures, and is not prone to volatilization at high temperatures, making the protective film less likely to crack and fall off under the cold and hot cycling conditions of equipment startup and shutdown. It also has excellent dielectric properties, does not interfere with circuit signal transmission, and meets the requirements of high-frequency circuits and control circuits.
In the moisture and dust protection coating system of circuit boards, modified silicone oil serves as a leveling and defoaming agent, improving the coating application effect, eliminating pinholes and bubbles in the coating, allowing the three-proof paint to evenly cover the solder joints of circuit components, and enhancing the overall protection capability. For flexible circuit production, low-friction silicone oil additives are selected to improve the smoothness of the film substrate, reducing substrate scratches during roll winding, stamping, and cutting processes, and reducing the risk of line breakdown caused by static electricity accumulation.
It is worth noting that when using silicone oil in circuit processing, the free small molecule content needs to be strictly controlled to prevent silicon migration from polluting the pads and affecting subsequent welding. Electronic-grade purified silicone oil has extremely low ion impurity content, meeting the clean production standards for precise circuits, and is widely used in industrial control circuits, new energy control boards, and consumer electronic mainboards protection scenarios. Currently, the demand for circuit boards driven by new energy and energy storage equipment is continuously increasing, and the protection requirements for circuits are constantly improving. The market demand for high-quality electronic silicone oil is steadily expanding, continuously helping electronic circuit products improve service life and operational stability.