In the PCB circuit board, the three anti-paint can be said to be indispensable. Three-proof paint is also called PCB electronic circuit board protection oil, coating oil, three-proof glue, moisture-proof paint, and three-proof paint. At present, the three-proof paint mainly includes solvent-based three-proof paint and UV three-proof paint. UV three-proof paint has the "three-proof" performance of waterproof, moisture-proof and dust-proof, as well as the performance of resistance to cold and heat shock, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, good flexibility, and strong adhesion. It is very common in PCB circuit boards.

UV three-proof paint

In PCB circuit boards, moisture is the most common and destructive factor. 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 PCB 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.

The above problems are the reasons why UV three-proof paint is needed. Coating UV conformal paint on printed circuit boards and components can reduce or eliminate the deterioration of electronic operation performance to a large extent, and extend the service life of the product.

UV three-proof paint used for the three-proof coating of circuit boards has excellent performance in bonding, protection, anti-corrosion, waterproofing, high and low temperature resistance, etc. It is widely used in PCB circuits working in high temperature, humidity, and corrosive gas environments. Board protection, can withstand mechanical vibration and swing, thermal shock, and operation under high temperature, and has excellent adhesion to various soft and hard boards and components.

UV three-proof paint is beneficial to improve the production efficiency of automated production lines and effectively improve product yield. In actual use, according to process requirements and characteristics, you can choose machine spraying, manual gluing, etc., partial or entire board glue coating, and then curing by UVLED curing equipment to achieve the three-proof effect. The main advantages are as follows:

1. Environmental protection and safety

1.1. UV glue does not contain VOC volatiles and does not pollute the ambient air;

1.2. There are relatively few restrictions or prohibitions on UV glue components in environmental protection laws and regulations;

1.3. No solvent, low flammability.

2. Economical and cost-saving

2.1. UV glue has a fast curing speed, which is conducive to automated production lines and improves labor productivity;

2.2. Testing and handling can be carried out after curing, saving space;

2.3. UVLED curing equipment is a cold light source, often (low) temperature curing, saving energy. For example, the energy required to produce 1g of light-curing pressure-sensitive adhesive only needs 1% of the corresponding water-based adhesive and 4% of the solvent-based adhesive. It can be used for materials that are not suitable for high temperature curing. Compared with thermosetting resin, the energy consumed by UV curing can save energy consumption by 90%;

2.4. Small size, less area, saving space;

2.5. UV glue coating only needs a very thin layer, which saves the amount and reduces the cost;

2.6. One-component system, no need to mix, easy to use.

3. Compatibility

3.1. Materials that are sensitive to temperature, solvents and moisture can be used;

3.2. The curing time, curing degree, etc. are adjustable, making the operation more intelligent and convenient;

3.3. It can be applied repeatedly and cured for many times;

3.4. UVLED curing equipment can be easily installed on the existing production line without major changes;

3.5. UV three-proof glue, for the shadow area that cannot be irradiated by UV light, it can be cured by secondary moisture.