Characterization of particle size evolution of the deposited layer during electrostatic powder coating processes

IPN Polysiloxane-Epoxy Resin for High Temperature Coatings: Structure Effects on Layer Performance after 450 °C Treatment

“…The treatment was performed manually adopting a gun-iron panel distance at about 30 cm. Powder coatings application was performed manually using a corona charging system on a GEMA powder gun (GEMA, Trezzano sul Naviglio, Italy), according to [18]. Powder was carefully fed into a venturi pump and then pneumatically transported to the corona gun by a feeding gas at 1.3 bar pressure.…”

Epoxy Resin-Encapsulated Polymer Microparticles for Room-Temperature Cold Sprayable Coatings

“…Powder coatings are extensively used in industrial applications to provide superior performance, durability, and surface protection. − To form a coating, a thin layer of fine powder is deposited onto a substrate, followed by softening, fusion, and curing at an elevated temperature. In comparison with conventional solvent-borne coatings and aqueous polymer dispersions, powder coatings offer distinct economic and environmental advantages, including avoiding the emissions of volatile organic compounds (VOCs), a reduced processing time, lower energy consumption during baking, and easy recycling of oversprayed powder. ,− All of these advantages have prompted the development of highly competitive powder coatings in the coating market; however, room for improvements remain …”

“…For example, when fluidized beds were used, the plates were preheated to 300–350 °C, dipped into the bed of fluidized powders for melting and film formation. , In the flame spray process, powders were introduced into the flame of combusted fuel (in excess of 2900 K) via an inert carrier gas . Electrostatic spray utilizes electrical energy in the form of plasma or an arc to apply powders onto the metal substrate, but the deposition still requires baking in a hot-air oven with temperatures between 300 and 400 °C to consolidate the powders into a continuous coating. , While using electrostatic forces and high-temperature baking significantly improves deposition efficiency and film formation, potential concerns remain. For example, the retention of the electrostatic charge decreases at higher temperatures and humidity levels, which restricts their use in outdoor applications .…”

“…13 Electrostatic spray utilizes electrical energy in the form of plasma or an arc to apply powders onto the metal substrate, but the deposition still requires baking in a hot-air oven with temperatures between 300 and 400 °C to consolidate the powders into a continuous coating. 2,5 While using electrostatic forces and high-temperature baking significantly improves deposition efficiency and film formation, potential concerns remain. For example, the retention of the electrostatic charge decreases at higher temperatures and humidity levels, which restricts their use in outdoor applications.…”

Metal-like conductivity exhibited by triboelectrically deposited polyaniline (emeraldine base) particles on microtextured SiC surfaces

“…Fine particles or pigments are electrostatically charged and sprayed onto a charged substrate to be coated without using any solvents. 3,14 A permanent coating can be obtained after the coating is thermally cured to melt the particles. 3 While some of these processes are well established and some are emerging, the unique and complex physical interactions between triboelectrically charged particles and surfaces can be further exploited to fabricate functional materials.…”