Comparison of operation processes for three anti paint
Time:2023-10-14
There are several operation processes for three proofing paint, which are convenient, simple, fast, and effective. Of course, before applying, the board should be cleaned thoroughly. Below, we will compare these processes carefully.
Preparation before use:
1. Clean and dry the board to remove moisture and moisture. It is necessary to first remove dust, moisture, and oil stains from the surface of the object to be coated, in order to fully utilize its protective effect. Thorough cleaning can ensure that corrosive residues are completely removed and that the three proofing paint adheres well to the surface of the circuit board. Drying conditions: 60 ° C, 10-20 minutes, take it out in the oven and apply it while it is hot;
2. Apply using a brush coating method, with a brush coating area larger than the area occupied by the device to ensure full coverage of the device and solder pad;
3. When brushing, the board should be placed as flat as possible, and there should be no dripping after brushing. The brushing should be flat and there should be no exposed parts, preferably between 0.1 and 0.3mm.
4. Before brushing and spraying, ensure that the diluted product is thoroughly stirred, and let it stand for 2 hours before brushing or spraying. Use a high-quality natural fiber brush to gently brush and dip at room temperature. If using machinery, the viscosity of the coating should be measured (using a viscosity agent or flow cup), and a diluent can be used to adjust the viscosity.
5. The circuit board components should be vertically immersed in the paint residue. Do not immerse the connector unless carefully covered. The circuit board should be immersed for 1 minute until the bubbles disappear, and then slowly removed. A uniform film will form on the surface of the circuit board. Most of the paint residue should be allowed to flow back from the circuit board to the impregnation machine. TFCF has different coating requirements. The immersion speed of circuit boards or components should not be too fast to avoid excessive bubbles.
6. If there is any skin formation on the surface after the dip coating is completed and reused, remove the skin and continue to use.
7. After brushing, lay it flat on the bracket and prepare for curing. The method of heating is to accelerate the curing of the coating. If the surface of the coating is uneven or contains bubbles, it should be left at room temperature for more time to allow the solvent to flash out before curing in a high-temperature furnace.
