High-Gloss Waterborne 2K PU Clearcoats Enabled via a Dual-Strategy: Internally Crosslinked Latex and Reactive Surfactant
발표자
천영재 (부산대학교)
연구책임자
백현종 (부산대학교)
공동저자
천영재 (부산대학교), 강혜린 (부산대학교), 백현종 (부산대학교)
초록
내용
The demand to reduce volatile organic compound (VOC) emissions has accelerated sustainable waterborne coating technologies; however, achieving high gloss and mechanical strength remains a challenge. This study presents a novel acrylic polyol resin for waterborne 2K polyurethane clearcoats to address these limitations by employing a dual strategy. Internally crosslinked particles were synthesized via a seeded emulsion process with a reactive surfactant, suppressing surfactant migration and improving colloidal stability and film smoothness. A hydrophilically modified isocyanate was then incorporated to form 2K clearcoat. By optimizing the internal crosslinker structure and content to balance particle rigidity with film coalescence, the 20° gloss increased remarkably from 76.8 to 89.3. Furthermore, the system showed indentation hardness and modulus higher than commercial waterborne clearcoat. Overall, this work presents eco-friendly strategy for high-performance industrial clearcoats.