Yan Xiaoxing, Tao Yu, Qian Xingyu
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). 2020 Oct 15;12(10):2366. doi: 10.3390/polym12102366.
Microcapsules were prepared by in situ polymerization with urea formaldehyde resin as the wall material and Dulux waterborne acrylic acid as the core material. The effects of the core-wall ratio, water bath temperature and depositing time on the morphology, particle size, yield and encapsulation ratio of microcapsules were investigated by orthogonal experiment of three factors and two levels. The results showed that the core-wall ratio had the greatest influence on the performance of microcapsules. When the core-wall ratio was 0.58:1, the water bath temperature was 70 °C, and the depositing time was 5 d, the microcapsule performance was the best. With the increase in depositing time, the yield of microcapsule particles increased gradually, and the microcapsules appeared to show an adhesive phenomenon. However, the long-term depositing time did not lead to complete deposition and agglomeration of microcapsules. When 10.0% concentration of the waterborne acrylic microcapsules with 0.58:1 of core-wall ratio was added to the coatings, the mechanical and optical properties of the coatings did not decrease significantly, but the elongation at break increased significantly. Therefore, this study offers a new prospect for using waterborne acrylic microcapsules to improve the toughness of waterborne paint film which can be cured at room temperature on a wood surface.
以脲醛树脂为壁材、都乐水性丙烯酸为芯材，通过原位聚合法制备微胶囊。采用三因素两水平正交试验，研究了芯壁比、水浴温度和沉积时间对微胶囊的形态、粒径、产率和包封率的影响。结果表明，芯壁比对微胶囊性能的影响最大。当芯壁比为0.58:1、水浴温度为70℃、沉积时间为5d时，微胶囊性能最佳。随着沉积时间的增加，微胶囊颗粒的产率逐渐提高，微胶囊出现黏附现象。然而，长时间的沉积并没有导致微胶囊完全沉积和团聚。当将芯壁比为0.58:1的10.0%浓度的水性丙烯酸微胶囊添加到涂料中时，涂料的机械性能和光学性能没有显著下降，但断裂伸长率显著提高。因此，本研究为利用水性丙烯酸微胶囊提高可在木材表面室温固化的水性漆膜韧性提供了新的前景。
