Zou Yuming, Xia Yongxin, Yan Xiaoxing
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2024 Aug 15;16(16):2308. doi: 10.3390/polym16162308.
Ultra-Violet (UV) coatings are widely adaptable of substrates and produce low emissions of volatile organic compounds. UV coatings can extend service life by adding self-healing microcapsules that restore integrity after sustaining damage. In this study, UV coating was used as a core material; microcapsules were produced and added to the UV coating to enhance its self-healing property, providing a good protection for both the UV coating and the substrate. UV primer microcapsules were prepared with UV primer as the core material and melamine formaldehyde resin as the wall material. The UV primer containing more than 98.0% solids content was mainly composed of epoxy acrylic resin, polyester acrylic resin, trihydroxy methacrylate, trimethyl methacrylate, and photo initiator. The preparation process of the UV primer microcapsules was optimized. Further, the UV coating was prepared with better UV primer microcapsules, and the effects of the UV primer microcapsules alongside the comprehensive properties of the coating were studied. The best preparation process for the UV primer microcapsules was as follows: the wall-core mass ratio was 1:0.50, Triton X-100 and Span-20 as emulsifiers with an HLB value of 10.04, the microcapsule reaction temperature was 70 °C, and the reaction time of the was 3.0 h. When the quantity of the UV primer microcapsules increased in the coating, color difference Δ of the coating increased, gloss decreased, transmittance decreased, elongation at break increased and then decreased, roughness increased, and self-healing rate first increased and then decreased. When the addition of the UV primer microcapsules reached 2.0%, the color difference Δ of the coating was 1.71, the gloss was 106.63 GU, the transmittance was 78.80%, the elongation at break was 3.62%, the roughness was 0.204 μm, and the self-healing rate was 28.56%, which were the best comprehensive properties of the UV primer. To improve the comprehensive properties of the UV coatings, the UV coatings were modified by a microcapsule technology, which gave the UV coatings a better self-healing property. The application range of microcapsules for the UV coatings was broadened. Based on the previous research of microcapsules in UV coatings, the results further refined the study of the effects of adding self-healing microcapsules to UV coatings using the UV coating itself as the core material.
紫外（UV）涂料对基材具有广泛的适应性，并且挥发性有机化合物排放量低。UV涂料可以通过添加自修复微胶囊来延长使用寿命，这些微胶囊在受到损坏后能够恢复完整性。在本研究中，UV涂料被用作核心材料；制备了微胶囊并将其添加到UV涂料中以增强其自修复性能，从而为UV涂料和基材都提供良好的保护。以UV底漆为核心材料、三聚氰胺甲醛树脂为壁材制备了UV底漆微胶囊。固体含量超过98.0%的UV底漆主要由环氧丙烯酸树脂、聚酯丙烯酸树脂、三羟甲基丙烯酸酯、三甲基丙烯酸酯和光引发剂组成。对UV底漆微胶囊的制备工艺进行了优化。此外，用性能更好的UV底漆微胶囊制备了UV涂料，并研究了UV底漆微胶囊的效果以及涂料的综合性能。UV底漆微胶囊的最佳制备工艺如下：壁材与芯材的质量比为1:0.50，以Triton X-100和Span-20作为乳化剂，其HLB值为10.04，微胶囊反应温度为70℃，反应时间为3.0小时。当涂料中UV底漆微胶囊的用量增加时，涂料的色差Δ增大，光泽度降低，透光率降低，断裂伸长率先增大后减小，粗糙度增大，自修复率先增大后减小。当UV底漆微胶囊的添加量达到2.0%时，涂料的色差Δ为1.71，光泽度为106.63 GU，透光率为78.80%，断裂伸长率为3.62%，粗糙度为0.204μm，自修复率为28.56%，这些是UV底漆的最佳综合性能。为了提高UV涂料的综合性能，采用微胶囊技术对UV涂料进行改性，使UV涂料具有更好的自修复性能。拓宽了微胶囊在UV涂料中的应用范围。基于之前对微胶囊在UV涂料中的研究，本结果进一步细化了以UV涂料本身为核心材料向UV涂料中添加自修复微胶囊的效果研究。
