One. Can fluorine-based paint be applied using a roller?
Yes. The fluorocarbon paint roller coating method is a rotating coating technique that can achieve a smooth and even surface finish using centrifugal force. This method minimizes waste and is suitable for large-scale production.
Two. Common coating methods for fluorocarbon paints include:
1、Brushing method
This is a relatively simple application method. The paint should be diluted to a viscosity that allows for application in 4 cups within 10-20 seconds. Use a soft-bristled brush to apply the paint in small amounts, ensuring that the portion of the brush immersed in the paint is no more than one-third of the brush length. Then, apply the paint in a pattern that creates a uniform and consistent thin layer, using a combination of horizontal and vertical strokes, applying first from left to right and then from right to left. If applying epoxy or acrylic acid-based primers, maintain a viscosity of 15-25 seconds.
2、Soaking Method
Common application methods include manual immersion, mobile immersion, centrifugal immersion, and vacuum immersion. These methods are suitable for small metal parts and applications such as steel pipe racks.
The process involves immersing all coated items completely in a container filled with coating, removing the coated items after a short period, hanging them on a fixed rack to allow excess coating to drip naturally, and drying them to achieve the desired coating.
3、 Spray application method
Common methods include air spraying, hot spraying, and high-pressure airless spraying.
(1) Air spraying method
This process involves spraying the coating from the spray gun nozzle, where compressed air generated by the air compressor creates a vacuum at the nozzle, causing the paint to break up and be sprayed as particles onto the surface to be coated. The air pressure from the air compressor ranges from 2-4 kg/cm², and the distance between the nozzle and the surface to be coated is 20-40 cm. The quality of the spray painting depends on the operator's skill and experience.
(2) Thermal Spraying Method
"Before application, the coating should be preheated to 40-60℃. The compressed air should also be preheated to a pressure of 1.7-2 kg/cm². This method offers precise control, minimal pollution, and increased coating thickness. The airless spraying method, which is suitable for heavy-duty anti-corrosion applications, yields excellent results."
(3) High-pressure, airless spraying method
This process involves increasing the pressure of the coating by 100-200 kg/cm² using a high-pressure pump. The coating is then sprayed through a specially designed nozzle with a small aperture (0.2-1 mm), forming fine streams in the air. Due to the strong surface action, these streams transform into fine particles that deposit onto the surface of the workpiece.
4、Roller Coating Method
After immersing the dry roller in fluorocarbon paint, roll it over the surface to be coated, transferring and depositing the paint onto the surface under pressure. Manual rolling techniques, such as applying paint to the exterior and interior walls of buildings, and mechanical rolling methods, such as pre-coating steel and aluminum sheets, are used for painting corrugated steel. This involves rolling metal into continuous sheets of a certain width and then applying paint to the sheets, which is then cured for industrial and construction applications.
5、Spraying method
It utilizes a spray gun for large-scale surface coating applications, such as aluminum composite panels. The application viscosity is 30-50 seconds, saving solvents, ensuring smooth coating, and eliminating dust. The resulting material has a high quality (approximately 10). This method also allows for "wet-on-wet" application.