纤维素纳米纤维作为黏合剂制备超疏水纸

Cellulose nano fibers as binder for fabrication of super hydrophobic paper

本文报告了通过简单的两步浸渍涂布法制备超疏水纸。首先,使用含沉淀碳酸钙颜料(PPC)和纤维素纳米纤维的含水悬浮液在滤纸上浸渍涂布形成粗糙表面。然后,将浸渍涂布后的滤纸用含烷基烯酮二聚体(AKD)的正庚烷溶液处理制备超疏水纸,通过测量水接触角来表征制备纸样的超疏水性能。扫描电镜图片表明:加入和不加纤维素纳米纤维时涂布纸样品表面的不同,可以看出纳米纤维起到了黏合作用。说明纤维素纳米纤维是形成粗糙PPC涂层实现超疏水的关键成分,它明显地提高了PCC团簇在纸张表面的留着,而留着的PCC团簇提供了形成超疏水表面所需的双重粗糙结构。

This study reports the preparation of super hydrophobic paper via a facile two step dip coating method. In the f irst step, f ilter paper samples were dip coated using an aqueous suspension containing precipitated calcium carbonate（PCC） pigments and cellulose nano fibers, to form a highly rough layer on the surface of the filter paper. Subsequently, the coated papers were treated with a solution of alkyl ketene dimer（AKD） in n-heptane, which led to the formation of super hydrophobic paper. Contact angle measurements confirmed the super hydrophobic nature of the paper prepared. SEM analysis was also carried out to characterize the surface differences of the coated paper samples with and without the added cellulose nano fibers and to clarify the binding role of cellulose nano fibers. It was observed that cellulose nano fiber is a critical component to the formation of the rough PPC coating layer required for giving super hydrophobicity; it significantly improves the retention of PCC clusters on the surface of the paper and the retained PCC clusters offer the structure of dual scale roughness.