Abstract Waterborne paints are sensitive to humidity and susceptible to microbial attack. To prevent aesthetic bio-deterioration, biocides are used. Some of these biocides leach out from paint film during aging. In this paper, we report the use of functionalized nanosilica as a non-leaching biocide. We used nanosilica (NS), nanosilica modified with p-nitrophenol (PNP-NS) and silica fume (SF) as antimicrobial agents in commercial waterborne paint at 0.5–2.5 % of total solid content in paint. It was observed that 2 % PNP-NS improved the antifungal properties by 100 % and 13 % compared to the control sample and commercial antifungal paint, respectively while the antibacterial property was improved by 50 % and 19 %, respectively. The algal defacement test showed more predominant values for paint with PNP-NS compared to paint with NS, SF, and commercial antifungal paint. The X-cut adhesion, hardness, opacity and water resistance of the dry paints were evaluated after application. The viscosity and opacity of paint films were not much affected by the additives NS and PNP-NS upto 2 %. Improved X-cut adhesion, hardness and water resistance were achieved with NS and PNP-NS. This study demonstrates that NS and PNP-NS are good additives to improve the antifungal and antibacterial properties of waterborne commercial paints.

中文翻译：

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功能化纳米二氧化硅作为水性涂料的抗菌添加剂

摘要 水性涂料对湿度敏感，易受微生物侵袭。为了防止美观的生物退化，使用杀生物剂。其中一些杀菌剂在老化过程中会从漆膜中渗出。在本文中，我们报告了功能化纳米二氧化硅作为非浸出杀菌剂的用途。我们使用纳米二氧化硅 (NS)、用对硝基苯酚 (PNP-NS) 和硅粉 (SF) 改性的纳米二氧化硅作为商业水性涂料中的抗菌剂，占涂料总固体含量的 0.5-2.5%。据观察，与对照样品和市售抗真菌涂料相比，2% PNP-NS 的抗真菌性能分别提高了 100% 和 13%，而抗菌性能分别提高了 50% 和 19%。与含有 NS、SF、和商业抗真菌涂料。应用后评估干漆的 X 切割附着力、硬度、不透明度和耐水性。漆膜的粘度和不透明度受添加剂 NS 和 PNP-NS 的影响不大，最高可达 2%。使用 NS 和 PNP-NS 实现了改进的 X 切割附着力、硬度和防水性。本研究表明，NS 和 PNP-NS 是改善水性商业涂料抗真菌和抗菌性能的良好添加剂。