There are many types of conformal coatings available for fully automatic coating machines. How to choose a suitable conformal coating? We must consider comprehensively based on the environment of our factory, electrical performance requirements, circuit board layout, mechanical properties and temperature resistance!
The selection of conformal paint is based on comprehensive considerations such as the characteristics of different types of conformal paint and the working environment, electrical performance requirements and circuit board layout.
The general conditions and requirements for the use of conformal paint are:
1. Working environment
People have different requirements for the physical resistance and chemical resistance of electronic equipment, such as pressure resistance, shock resistance, waterproofing, acid and alkali corrosion resistance, etc. Therefore, conformal coatings with different characteristics must be selected for different working environments.
2. Electrical performance requirements.
Three-proof paint should have high dielectric strength and breakdown voltage. The minimum insulation strength requirement of conformal paint can be determined from the spacing of printed lines and the potential difference of adjacent printed lines.
3. Circuit board layout.
The design of the circuit board should take into account the placement of components that do not require coating, including connectors, IC sockets, tunable potentiometers and test points, which should be placed on the edge of one side of the circuit board to achieve the simplest coating process and lowest coating costs.
4. Mechanical properties and temperature resistance. The temperature resistance and mechanical properties of the resins in conformal coatings vary greatly depending on their types. Our highest temperature resistance can reach 400 degrees, and the lowest temperature can withstand -60 degrees.
Applications of fully automatic coating machines in the industry:
PCB three-proof paint is also called PCB electronic circuit board moisture-proof oil, coating oil, waterproof glue, insulating paint, moisture-proof paint, three-proof paint, anti-corrosion paint, anti-salt spray paint, dust-proof paint, protective paint, coating paint, Three-proof glue, etc. PCB circuit boards that have used three-proof paint have “three-proof” properties of waterproof, moisture-proof, and dust-proof, as well as resistance to cold and heat shock, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, and flexibility. It has good properties and strong adhesion, so it is widely used.
Initially, conformal coatings were only used in printed circuit boards in high-tech fields. As electronic devices are more and more widely used in daily life, consumers are now paying more and more attention to the quality and reliability of products. The use of conformal coatings can enable manufacturers to effectively improve product quality and reduce costly maintenance costs. Lifetime breakdown costs.
Typical uses include the following ranges:
1. Civilian and commercial applications.
Conformal coatings (common coatings) protect electronic circuits in household appliances, making them resistant to:
(1) Water and detergent (washing machines, dishwashers, bathroom products, outdoor electronic LED screens).
(2) Unfavorable external environment (display screen, anti-theft, fire alarm device, etc.).
(3) Chemical environment (air conditioner, dryer).
(4) Harmful substances in offices and homes (computers, induction cookers).
(5) All other circuit boards that require three-proof protection.
2. Automotive industry.
The automotive industry requires conformal paint to protect circuits from the following hazards, such as gasoline evaporation, salt spray/brake fluid, etc. The use of electronic systems in automobiles continues to grow rapidly, so the use of conformal coatings has become a basic requirement to ensure long-term reliability of automotive electronic devices.
3.Aerospace.
Due to the particularity of the use environment, the aviation and aerospace environment has strict requirements on electronic equipment, especially under conditions of rapid pressurization and decompression, good circuit performance must still be maintained. The pressure-resistant stability of conformal coatings is therefore widely used.
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 conformal paint can maximize the protection of equipment on the water and even submerged and underwater.
Post time: Sep-21-2023