RAL1026 Luminous yellow electrostatic thermoset powder coating for Air Conditioners
The most common way of applying the powder coating to metal objects is to spray the powder using an electrostatic gun, or Corona gun. The gun imparts a positive electric charge on the powder, which is then sprayed towards the grounded object by mechanical or compressed air spraying and then accelerated toward the workpiece by the powerful electrostatic charge. There are a wide variety of spay nozzles available for use in electrostatic coating. the type of nozzle used will depend on the shape of the workpeice to be painted and the consistency of the paint. The object is then heated, and the powder melts into a uniform film, and is then cooled to form a hard coating. It is also common to heat the metal first and spray the powder onto the hot substrate. Preheating can help to achieve a more uniform finish but can also create other problems, such as runs caused by excess powder. See the article "Fusion Bonded Epoxy Coatings"
Another type of gun is called a Tribo gun, which charges the powder by (triboelectric) friction. In this case, the powder picks up a positive charge while rubbing along the wall of a Teflon tube inside the barrel of the gun. These charged powder particles then adhere to the grounded substrate. Using a Tribo gun requires a different formulation of powder than the more common Corona guns. Tribo guns are not subject to some of the problems associated with Corona guns, however, such as back ionization and the Faraday Cage Effect.
Powder can also be applied using specifically adapted electrostatic discs.
Another method of applying powder coating, called the Fluidized Bed method, is by heating the substrate and then dipping it into an aerated, powder-filled bed. The powder sticks and melts to the hot object. Further heating is usually required to finish curing the coating. This method is generally used when the desired thickness of coating is to exceed 300 micrometres. This is how most dishwasher racks are coated.
Suit your widest needs
There are two main categories of powder coatings: Thermosets and thermoplastics. The thermosetting variety incorporates a cross-linker into the formulation. When the powder is baked, it reacts with other chemical groups in the powder polymer and increases the molecular weight and improves the performance properties. The thermoplastic variety does not undergo any additional reactions during the baking process, but rather only flows out into the final coating.
The most common polymers used are polyester, polyester-epoxy (known as hybrid), straight epoxy (Fusion bonded epoxy) and acrylics.
| Testing Items | Standard | Data |
| Appearance | | Flat And Smooth |
| Coating Thickness | GB/T6554-2003 | 50~70mm |
| Gloss(60°) | GB/T9754-2007 | From 2%~100% to All Gloss |
| Impact Resistance | GB/T1732-1993 | 50kg.cm |
| Bending Performance | GB/T6742-2007 | 2mm |
| Cupping | GB/T9753-2007 | 8mm |
| Adhesion Force | GB/T9286-1998 | 0 Grade |
| Hardness | GB/T6739-2006 | 2H |
| Resistant to Salt (1000 Hours) | GB/T1771-2007 | No Change For Coating Appearance |
| Humidity And Heat Resistance (1000 Hours) | GB/T1740-2007 | No Change For Coating Appearance |
| Chemical Medium Resistance (240 Hours) 5%H2SO4 5%HCl 5%NaOH 5%NaCl | GB/T1763-1979 | No Change For Coating Appearance No Change For Coating Appearance No Change For Coating Appearance No Change For Coating Appearance |
| Heat Resistance | GB/T1735-2009 | It Can Reach Between 220℃/20minutes And 240℃/40minutes According To Color And Different Requirement |
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Air Conditioners Thermoset Powder Coating Various RAL1026 Color Optional Images
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