Investigation of Factors Influencing Polyester–TGIC-Type Wrinkle-Pattern Powder Coatings
Release Date:
2021-10-29
Wrinkle‑pattern powder coating is an artistic type of powder coating that achieves a textured, linear surface by incorporating pigments into the powder. It offers strong decorative appeal, can conceal imperfections in the substrate, and is resistant to pinholing. It places minimal demands on surface leveling and is widely used in applications such as doors and windows, steel‑wood furniture, sewing machines, instruments, and small electromechanical enclosures.
Wrinkle‑pattern powder coatings are decorative powder coatings that achieve a textured, linear surface by incorporating pigments into the powder formulation. They offer strong aesthetic appeal, can mask defects in the substrate, and are less prone to pinholing. These coatings place modest demands on surface leveling and are widely used in applications such as doors and windows, steel‑wood furniture, sewing machines, instrumentation, and small electromechanical enclosures. Most wrinkle‑pattern powder coatings are formulated with polyester–epoxy systems, which provide good corrosion resistance but relatively poor aging performance. When subjected to QUV accelerated weathering tests, they exhibit loss of gloss and chalking after approximately 50 hours, limiting their use to indoor applications. In contrast, polyester–TGIC‑based wrinkle‑pattern powders show more pronounced loss of gloss and chalking only after 250–300 hours of exposure, making them suitable for outdoor use. This paper primarily investigates how various factors—such as the type of polyester resin, the nature of fillers, the ratio of polyester resin to pigment/filler, the dosage of curing accelerators, and the amount of wrinkle‑inducing agents—affect both the powder characteristics and the resulting coating film within polyester–TGIC systems.
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