You Tianlong, Guo Guixuan, Li Wenbo
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China.
ACS Appl Mater Interfaces. 2024 Aug 21;16(33):43907-43917. doi: 10.1021/acsami.4c06278. Epub 2024 Aug 7.
The aqueous formulation of antismudge coatings is a crucial step for environmental protection and pollution reduction. However, the inferior mechanical durability of waterborne antismudge coatings poses challenges for their practical application. Herein, we developed a fully waterborne antismudge coating with excellent scratch resistance by preparing hyperbranched amine-rich polysiloxane (HSP) for antismudge ability and epoxy-rich zirconium-based aqueous solution (ZAS) for mechanical performance. The former is obtained by combining SP, polydimethylsiloxane modified by 3-isocyanatopropyltriethoxysilane (IPTS), with 3-aminopropyltriethoxysilane (KH550), and the latter is synthesized using zirconium propoxide solution (TPOZ) with 3-glycidyloxypropyltrimethoxysilane (KH560). This report investigates the effects of the chain length and content of SP on the performance of the coating. The results indicate that the coating exhibits optimal comprehensive performance when the molecular weight of polydimethylsiloxane is 4.5 kDa, and the mass fraction of SP in HSP is 1.5%. The coating possesses high transparency similar to glass, good adhesion (≈3 MPa) to various substrates, high hardness (8H), flexibility (2.5 mm bending radius), and exceptional antismudge property. More importantly, the coating can still maintain excellent antismudge property even after enduring 400 cycles of abrasion with steel wool. Furthermore, the rapid enrichment of polydimethylsiloxane on the coating surface endows the coating with excellent lubrication ability, allowing most common liquid stains to slide off the coating surface. Moreover, the rewritability of the coating remains stable even after writing traces that have persisted on its surface for several weeks. This coating is anticipated to be utilized for protecting foldable electronic screens, vehicles, and other fields.
防污涂料的水性配方是环境保护和减少污染的关键一步。然而，水性防污涂料较差的机械耐久性给其实际应用带来了挑战。在此，我们通过制备具有防污能力的超支化富胺聚硅氧烷（HSP）和具有机械性能的富环氧锆基水溶液（ZAS），开发了一种具有优异耐刮性的全水性防污涂料。前者是通过将SP（由3-异氰酸酯基丙基三乙氧基硅烷（IPTS）改性的聚二甲基硅氧烷）与3-氨丙基三乙氧基硅烷（KH550）结合而获得的，后者是使用丙醇锆溶液（TPOZ）与3-缩水甘油氧基丙基三甲氧基硅烷（KH560）合成的。本报告研究了SP的链长和含量对涂层性能的影响。结果表明，当聚二甲基硅氧烷的分子量为4.5 kDa且HSP中SP的质量分数为1.5%时，涂层表现出最佳的综合性能。该涂层具有与玻璃相似的高透明度，对各种基材具有良好的附着力（约3 MPa）、高硬度（8H）、柔韧性（弯曲半径2.5 mm）和优异的防污性能。更重要的是，该涂层即使在用钢丝绒进行400次磨损循环后仍能保持优异的防污性能。此外，聚二甲基硅氧烷在涂层表面的快速富集赋予了涂层优异的润滑能力，使大多数常见的液体污渍能够从涂层表面滑落。而且，即使书写痕迹在其表面持续数周后，涂层的可重写性仍保持稳定。这种涂层有望用于保护可折叠电子屏幕、车辆等领域。
