3 kinds of waterproof and anticorrosive packaging methods for PCB

PCBA boards are easily damaged by the surrounding environment during transportation and installation. Therefore, it is particularly important to make PCBA waterproof, moisture-proof, dust-proof, insulating and anti-corrosion. There are many packaging methods for PCBA boards. There are three common ways. They are Encapsulation methods such as coating with conformal paint, low-pressure injection molding and potting. Each of the above methods has its own advantages and disadvantages. And for directly spraying the three-proof paint, although The operation is simple, convenient, and easy to implement. But it cannot really protect the circuit board, waterproof and shockproof, and the package may fail after a long time. And the low pressure injection molding abrasive tool design and post-production costs are very high. Therefore, unless you have a sufficient budget, do not try this approach. And today Today our JY company wants to bring you knowledge of PCBA potting.

 

The advantages of glue filling-PCBA potting

a. After the PCBA processing and dispensing process is completed, the product is moisture-proof, waterproof, weather-resistant, and can be used for a long time.

b. It does not corrode metal and is suitable for potting and sealing of PCBA board modules.

c. The colloid is flexible and has good resistance to shock, shock and deformation.

d. High insulation, stable operation of products after potting.

e. Good fluidity, quick self-leveling, high potting production efficiency.

f. With detachability, a certain component of the sealed circuit board can be taken out for repair and replacement, and then repaired with waterproof glue without leaving traces.

Processing flow

a. Clean

Use anhydrous alcohol and a hard brush to scrub and clean the PCBA board, especially the rosin residues and solder residues at the solder joints.

b. Dry

Use a dryer or hot air cylinder to dry the PCBA board, and then carefully check it again after drying to see if there are obvious solder joints, short-circuit solder joints, and solder slag residue.

c. Coating waterproof glue

Brush the PCBA board with a brush for the waterproof glue, or dip the PCBA board into the waterproof glue once, and then wait for the waterproof glue to solidify. It takes more than 12 hours to dry naturally before proceeding to the next process.

d. Functional test

Perform a functional test on the PCBA. After the abnormally tested board is repaired, the waterproof glue circuit board processing and dispensing process will be carried out from the third step. If it is normal, it will go to the next step.

e. Filling

Fill the entire PCBA board to the shell part with epoxy resin/silicone/glue stick, etc., fix the wiring and seal it, and be careful not to have dead corners, and the glue should be as smooth and beautiful as possible.

f .dry

It takes more than 24 hours. After completion, according to the actual situation, random inspection or full inspection of the circuit board to confirm whether the function is normal.

 

Sincerely hope my sharing today will bring you some help.