The main methods of using silicone resin coatings include the following:
1. Manual spraying
Operation method: spraying through an aerosol can or a handheld spray gun.
Applicable scenarios: small-scale production or occasions where fine spraying of specific areas is required.
Notes:
Before spraying, ensure that the surface of the substrate is clean, free of dust and oil.
When spraying, keep the appropriate distance between the spray gun and the substrate to ensure uniform coating.
The stability between spraying batches may be slightly worse, and the sprayer needs to have certain skills and experience.
2. Selective spraying
Operation method: Use a programmable spray path to spray the silicone resin coating on a specific area on the circuit board or other substrate.
Applicable scenarios: large-scale production, especially occasions where specific areas on the circuit board need to be sprayed.
Notes:
The surface drying time and viscosity of the coating are required to be high, and the process parameters need to be adjusted and explored.
The setting of the programmable spray path needs to be precise to ensure that the position and thickness of the coating meet the requirements.
3. Dipping
Operation method: completely immerse the substrate (such as a circuit board) into the silicone resin coating and then remove it.
Applicable scenarios: large-scale production, and occasions where both sides of the substrate need to be coated.
Notes:
The dipping speed, removal speed, dipping time and viscosity will affect the thickness and uniformity of the coating.
The areas that do not require coating need to be masked to prevent the coating from penetrating.
4. Brushing
Operation method: use a brush to evenly apply the silicone resin coating on the substrate.
Applicable scenarios: small-scale production, repair or rework, etc.
Notes:
Maintain uniform force when brushing to ensure consistent coating thickness.
Before brushing, make sure the brush is clean and free of impurities.
5. Other precautions
Curing: Silicone resin coatings generally follow the moisture curing mechanism, that is, the coating reacts with moisture in the environment to form a cured coating. Heating can accelerate the curing speed, but it is necessary to ensure that the bubbles in the coating have been completely eliminated before heating.
Construction environment: The environment should be kept clean and dry during construction to avoid the influence of dust and moisture on the coating quality.
Safety measures: During the construction process, appropriate protective equipment such as gloves and masks should be worn to prevent the coating from irritating the skin and respiratory tract.
In summary, there are many ways to use silicone resin coatings, and the specific method to be selected depends on many factors such as production scale, substrate type, coating requirements, and construction conditions. In actual application, the appropriate construction method should be selected according to the specific situation, and the operating procedures and safety measures should be strictly followed.