Gavande Vishal, Mahalingam Shanmugam, Kim Junghwan, Lee Won-Ki
BB 21plus Team, Department of Polymer of Polymer Engineering, Pukyong National University, Busan 48513, Republic of Korea.
Department of Materials System Engineering, Pukyong National University, Busan 48513, Republic of Korea.
Polymers (Basel). 2024 Sep 9;16(17):2544. doi: 10.3390/polym16172544.
Polymer coatings are widely used in industries for protection, decoration, and specific applications, typically including volatile organic compounds (VOCs) to achieve low viscosity. The growing environmental concerns and the anticipated limits on fossil feedstock have driven the coating industry towards eco-friendly alternatives, with UV-curing technology emerging as a promising solution due to its energy efficiency, low-temperature operation, reduced VOC emissions, and high curing speed. Polyurethane acrylates (PUAs) are critical in UV-curable formulations, offering excellent flexibility, impact strength, optical, and adhesion properties. However, UV-cured PUA coatings face limitations in thermal stability and tensile strength, which can be addressed by incorporating fillers. This study investigates the effects of multi-functionalized hexagonal boron nitride (hBN) nanoparticles on the mechanical, thermal, optical, and adhesion properties of UV-cured PUA films and coatings for pre-coated metals. The results demonstrated that incorporating hBN nanoparticles enhanced the mechanical and thermal properties of the nanocomposite films, with optimal performance observed at 0.5% hBN loading. Despite the improved properties, the FTIR spectra indicated that the low concentration of hBN did not produce significant changes, potentially due to the overshadowing signals from the difunctional polyurethane acrylate.
聚合物涂层在工业中广泛用于保护、装饰和特定应用，通常包含挥发性有机化合物（VOCs）以实现低粘度。日益增长的环境问题以及对化石原料预期的限制促使涂料行业转向环保替代品，由于其能源效率高、低温操作、VOC排放减少以及固化速度快，紫外光固化技术成为一种有前景的解决方案。聚氨酯丙烯酸酯（PUA）在紫外光固化配方中至关重要，具有出色的柔韧性、冲击强度、光学和粘附性能。然而，紫外光固化的PUA涂层在热稳定性和拉伸强度方面存在局限性，可通过加入填料来解决。本研究调查了多功能化六方氮化硼（hBN）纳米颗粒对预涂覆金属的紫外光固化PUA薄膜和涂层的机械、热、光学和粘附性能的影响。结果表明，加入hBN纳米颗粒增强了纳米复合薄膜的机械和热性能，在hBN负载量为0.5%时观察到最佳性能。尽管性能有所改善，但傅里叶变换红外光谱（FTIR）表明，低浓度的hBN并未产生显著变化，这可能是由于双官能聚氨酯丙烯酸酯的信号掩盖所致。
