Overview of powder coating process and product selection

China Coatings Online News:
Powder coating is a method of applying powder material to the surface of the substrate, heating it to a fluid state, and then curing it over the substrate surface to form a protective or decorative coating. Powder coatings have many advantages over conventional liquid coatings, such as better environmental performance, a single coating can obtain a thicker coating, a variety of styles and so on.
powder coating is complex in some respects and requires the selection of suitable products and coating processes according to different needs. So how do you do a good job of powder coating?
1, powder coating step 1.1
1.1 first determine the type of substrate that needs to be coated. Powder coatings are divided into two types of thermoplastic and thermosolytic, according to different substrates to choose the right powder coating, in order to achieve the best coating results.
1.2 Remove all threads or lubrication connectors and all components that do not require coating prior to coating. It sounds simple, but many people forget this step. Powder coatings attach to everything, including screws, nuts, bearings, etc. that do not need to be coated.
1.3 thoroughly clean the metal surface. Use projectiles or blasts to treat carbide to remove dirt and rust from the surface. Clean the surface with chemical solvents of grease, coating, and can be polished and polished. If required, aluminum, magnesium and other soft metal alloys can be cleaned with solvents and polished with wire brushes.
coating on the substrate surface at a time of 1.4. By using a spray gun or compressed air sprayer to attach charged powder paint to the grounded substrate surface, the price of the spray gun is recommended for a minimum of $100 depending on the supplier. In the experiment, the powder can be sprayed directly on the surface of the metal plate.
1.5 to select the appropriate temperature curing powder coating attached to the substrate. Ovens can be used for curing, generally for smaller metal substrates, large substrates can also be cured by infrared or other flameless heat sources. Normally, the object is heated to 175 to 190 degrees C, about 10 to 15 min, and then cooled.
2, the difference between thermoplastic powder coating and thermosolytic powder coating
2.1 thermoplastic powder coating can be remelted and cured, and the thermosteric powder coating can not be remelted after curing, which is the most obvious difference between the two.
as the names of both, the non-re-curing of thermostat powder coatings is due to irreversible chemical reactions, in contrast, thermoplastic powder coatings do not have chemical reactions during the curing process.
2.2 depends on the characteristics of the substrate that needs to be applied. Thermoplastic and thermooenstic powder coatings are used on different substrates due to different chemical properties.
thermooensilable powder coatings: it enhances the integrity of the substrate, is suitable for substrates that can be severely worn, and provides chemical and heat resistance.
thermoplastic powder coatings: they provide strength and flexibility and are commonly used in plastics and mechanical parts.
2.3 on the advantages and disadvantages of thermoo-solid powder coatings. General thermoo-solid powder coatings are used on heat-resistant substrates.
: the coating is beautiful, the cost is low, the coating stability and heat resistance is good.
: The irreversible curing process means that the coating cannot be recycled and it is difficult to melt and cure again.
2.4 on the advantages and disadvantages of thermoplastic powder coatings. Thermoplastic powder coatings are commonly used on plastic and durable substrates like park benches, and are also widely used on the outer surface of metal pipes.
: high lubricity, ability to remelt and cure, increased impact resistance
disadvantages: generally high cost; heating may melt.
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