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Moisture is the most common and destructive main factor for PCBA circuit boards. Excessive moisture will greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, reduce the Q value, and corrode the conductors. We often see the patina on the metal part of the PCBA circuit board.
Hundreds of pollutants randomly found on printed circuit boards have the same destructive power. They can cause the same results as moisture erosion-electronic decay, corrosion of conductors, and even irreparable short circuits. The most common pollutants found in electrical systems may be chemicals left over from the manufacturing process. Examples of these contaminants include fluxes, solvent release agents, metal particles, and marking inks. There are also major pollution groups that are caused by humans carelessly, such as body oils, fingerprints, cosmetics and food residues. There are also many pollutants in the operating environment, such as salt spray, sand, fuel, acid, and other corrosive vapors and molds.
Coating the three-proof paint on the printed circuit board and components can reduce or eliminate the decline of electronic operation performance when it may be affected by adverse factors in the operating environment.
If the coating paint can maintain its effect for a satisfactory period of time, such as longer than the product's service life, it can be deemed to have achieved its coating purpose.
Even if the coating layer is very thin, it can withstand mechanical vibration and swing, thermal shock, and operation under high temperature to a certain extent. Of course, the idea that the film can be used to make the individual parts inserted in the printed circuit board have mechanical strength or sufficient insulation is wrong. The components must be mechanically inserted firmly, and they need to have their own suitable caulking agent, so that there is double insurance to prevent accidents.
What is the function of three anti-paints?
Three anti-paint (common film) is a special formula of paint, used to protect circuit boards and related equipment from environmental erosion, thereby increasing and prolonging their service life, ensuring the safety and reliability of use.
Three-proofing refers to: moisture-proof, salt-fog-proof and anti-static. Common film is a very thin protective layer for electronic circuits and components, which can enhance the moisture and pollution resistance of electronic circuits and components and prevent corrosion of solder joints and conductors. It can also shield and eliminate electromagnetic interference and prevent short circuits. The effect of improving the insulation performance of the circuit board.
In addition, the PCB coating protective film is also conducive to the abrasion and solvent resistance of circuits and components, and can release the pressure caused by periodic changes in temperature.
Electronic equipment working in harsh environmental conditions such as the field, aerospace, navigation, etc., whose circuit substrates are easily affected by moisture, salt spray, and mold, which can cause system failures. Therefore, the three-proof coating technology for circuit substrates has become a backup in the electronic assembly field. Process technology of concern.
Under realistic conditions, such as chemical, vibration, high dust, salt spray, humidity and high temperature, the circuit board may have corrosion, softening, deformation, mildew and other problems, which may cause the circuit board to malfunction. The three-proof paint is coated on the surface of the circuit board to form a layer of three-proof protective film (three-proof refers to anti-moisture, anti-salt spray, and anti-mildew).
What is the function of three anti-paints?
Application scenarios of three anti-paints
1. Civil and commercial applications Three-proof paint can provide protection for electronic circuits in household appliances, so that they can resist: such as: water, humidity, insects, office and home harmful substances.
Such as: soybean milk machine, coffee machine, induction cooker, dryer, dishwasher, air conditioner, computer, bathroom electronics, electric car, etc.
2. Automobile industry The automobile industry requires the three-proof paint to protect the circuit from the hazards of the following situations, such as gasoline vapors, salt spray, brake fluid, etc. The application of electronic systems in automobiles continues to grow rapidly, so the use of three anti-paints has become a basic requirement to ensure long-term reliability of automobile electronic devices.
Such as: computer control system, air conditioning, automotive electronics.
3. Aerospace Due to the particularity of the use environment, the aviation and aerospace environments have strict requirements on electronic equipment, especially under the conditions of rapid pressurization and decompression, still maintaining good circuit performance. Therefore, the pressure stability of the three anti-paints has been widely used.
Such as: satellite system, military control system, flight line control system.
4. Navigation Whether it is fresh fresh water or salty seawater, it will cause harm to the electrical circuits of ship equipment. The use of three-proof paint can maximize the protection of the equipment on the water surface and even the submerged and underwater equipment.
Such as: navigation system, radar control system.
5. Electronic industry The three-proof paint can protect electronic equipment from water, moisture, external chemicals and special use environment erosion, to ensure its continuous stability, and its application range is very wide.
Such as: LED display screen, LED guardrail tube, solar energy, instrumentation, power supply, inverter, consumer electronics, anti-theft and fire alarm device, etc.
Application scenarios of three anti-paints
Advantages of automatic spraying of three-proof paint by machine
Machine automatic spraying is suitable for large-scale production, large-scale or long-term production customers. The advantages are: selective spraying, high precision, uniform coating, saving glue, reducing costs, reducing pollution, and replacing labor.
