DWI - Leibniz-Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstr. 50, 52056 Aachen, Germany.
Sci Rep. 2017 Jan 5;7:39910. doi: 10.1038/srep39910.
Highly loaded polymer/clay nanocomposites with layered structures are emerging as robust fire retardant surface coatings. However, time-intensive sequential deposition processes, e.g. layer-by-layer strategies, hinders obtaining large coating thicknesses and complicates an implementation into existing technologies. Here, we demonstrate a single-step, water-borne approach to prepare thick, self-assembling, hybrid fire barrier coatings of sodium carboxymethyl cellulose (CMC)/montmorillonite (MTM) with well-defined, bioinspired brick-wall nanostructure, and showcase their application on textile. The coating thickness on the textile is tailored using different concentrations of CMC/MTM (1-5 wt%) in the coating bath. While lower concentrations impart conformal coatings of fibers, thicker continuous coatings are obtained on the textile surface from highest concentration. Comprehensive fire barrier and fire retardancy tests elucidate the increasing fire barrier and retardancy properties with increasing coating thickness. The materials are free of halogen and heavy metal atoms, and are sourced from sustainable and partly even renewable building blocks. We further introduce an amphiphobic surface modification on the coating to impart oil and water repellency, as well as self-cleaning features. Hence, our study presents a generic, environmentally friendly, scalable, and one-pot coating approach that can be introduced into existing technologies to prepare bioinspired, thick, fire barrier nanocomposite coatings on diverse surfaces.
具有层状结构的高负载聚合物/粘土纳米复合材料作为一种强大的阻燃表面涂层正在兴起。然而，耗时的顺序沉积过程，例如层层策略，阻碍了获得大的涂层厚度，并使现有技术的实施复杂化。在这里，我们展示了一种一步法，即水基方法，用于制备具有明确定义的仿生砖墙纳米结构的厚的、自组装的、混合的纤维素羧甲基钠（CMC）/蒙脱土（MTM）防火阻隔涂层，并展示了它们在纺织品上的应用。通过在涂层浴中使用不同浓度的 CMC/MTM（1-5wt%）来调整纺织品上的涂层厚度。虽然较低的浓度赋予纤维的共形涂层，但从最高浓度在纺织品表面获得更厚的连续涂层。全面的防火和阻燃测试阐明了涂层厚度增加时防火和阻燃性能的增加。这些材料不含卤素和重金属原子，并且来源于可持续的、甚至部分可再生的建筑材料。我们进一步在涂层上引入了一种两亲性表面改性，赋予了拒油和拒水以及自清洁功能。因此，我们的研究提出了一种通用的、环保的、可扩展的、一锅法的涂层方法，可以将其引入现有技术中，在各种表面上制备仿生、厚的、防火阻隔纳米复合材料涂层。
