source:Industry News release time:2022-05-14 Article author:yu Popular:pcb
Maybe some people are not very clear about the three-proof paint. Now I will briefly introduce it. The three-proof paint is also called PCB electronic circuit board protection oil, coating oil, moisture-proof paint, three-proof paint, waterproof glue, insulating paint, anti- Corrosion paint, anti-salt spray paint, dust-proof paint, protective paint, overcoat paint, three-proof glue, etc.
The PCB circuit boards that have used the three-proof paint have waterproof, moisture-proof, dust-proof "three-proof" performance and resistance to thermal shock, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, good flexibility, and adhesion. Strong performance.
Moisture in the PCB manufacturing process is the most common and destructive major factor for PCB circuit boards. Excessive moisture can greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, lower the Q value, and corrode the conductors. We often see the patina on the metal part of the PCB circuit board, which is caused by the chemical reaction of metal copper without conformal paint, water vapor and oxygen. Hundreds of contaminants found casually on printed circuit boards are equally destructive. They can cause the same results as moisture attack - electronic decay, corrosion of conductors and even irreparable short circuits.
The contaminants most commonly found in electrical systems are probably chemicals left over from the manufacturing process. Examples of these contaminants are fluxes, solvent release agents, metal particles, and marking inks. There are also major pollution groups that are caused by human beings, such as human body oils, fingerprints, cosmetics and food residues. There are also many contaminants in the operating environment, such as salt spray, sand, fuel, acid, and other corrosive vapors and mold. Coating conformal paint on printed circuit boards and components can greatly reduce or eliminate the deterioration of electronic operating performance when it may be affected by adverse factors in the operating environment. If the coating can maintain its function for a satisfactory period of time, such as longer than the service life of the product, it can be regarded as having achieved its purpose of coating. Even if the coating is very thin, it can withstand mechanical vibration and vibration, thermal shock, and operation at high temperatures to a certain extent. Components must be mechanically inserted, and must have their own suitable caulk, so that there is double insurance against accidents. Therefore, the use of conformal paint plays an absolute role in PCB production.
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