Process for the preparation of powder coatings
A technology of powder coating and coating, which is applied in the direction of powder coating, coating, and thin material treatment, and can solve problems such as low efficiency, loss of technical performance of coating, and difficulty in control
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Embodiment 1
[0052] Unirradiated UV powder coating composition
[0053] 1.1 A preparation method of a transparent coating composition: 97 wt % of Uvecoat ® 1000 (UCB Surface Specialties), a kind of unsaturated polyester with methacrylate groups, 2 wt % of Irgacure ® 2959 as a photoinitiator (Ciba) and 1 wt % Powdermate(R) EX-486 (Troy Chemical Company) as a flow additive was dry blended.
[0054] After each component is mixed in the mixer, the coating composition is further extruded in a twin-screw extruder, and the extruder is set at a temperature of 110-120°C. After extrusion, the molten composition is cooled on a cooling belt and the resulting product is correspondingly pressed into small tablets. The flakes are then milled and sieved to achieve a typical particle size distribution suitable for electrostatic spraying: 5-120 μm.
[0055] 1.2 A preparation method of a transparent coating composition: dry mix 88.5 wt % of Uvecoat ® 1000 (UCB Surface Specialties), a kind of unsaturated ...
Embodiment 2
[0059] Irradiated IV Powder Coating Compositions
[0060] The irradiated powder coating was prepared using the same powder formulation as previously described in Example 1.1. A powder coating sample (100 g) was carefully charged into a powder sieve (150 μm mesh opening) equipped with a mechanical stirrer. After the agitator is activated, the powder begins to flow intermittently through the screen into the plastic tank receiver located on the ground. The distance between the screen and the receiver was set at 100 cm. To irradiate the powder, a UV lamp was installed between the powder screen and the receiver, at half the distance (50 cm) between the screen and the receiver. The distance between the UV lamp and the center of the passing powder (calculated from the center of the sieve) was fixed at 12 cm. To provide safety, the powder area is isolated from the UV source with an additionally installed quartz plate. The time required to fully complete the powder coating charge...
Embodiment 3
[0063] UV powder coating composition according to the invention
[0064] Powder coating samples formulated and processed as previously described in Example 1.1 and Example 2 were mixed in a ratio of 25:75, respectively. The resulting powders were thoroughly mixed and applied using a laboratory mixer. With an electrostatic spray gun, the powder was sprayed on a metal plate coated with a black cationic electrodeposition primer to a film thickness of 80 μm. The sprayed powder pattern was heated at 120°C for 10 minutes using a combination of IR and convective heating. The hot metal plate with the fused powder coating was then UV cured by means of a medium pressure Hg lamp (melting 240 W / cm radiation source, the strongest operating wavelength region is 200-390 nm). The UV dose for the curing step should be adjusted so that the coating is fully cured; typically, the UV dose is about 3000mJ / cm 2 .
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