木质素基超疏水涂层的制备及其应用性能研究

A Study of Preparation and Application Performance of Lignin-based Superhydrophobic Coatings

超疏水涂层由于其广泛的应用前景,近年来备受关注。然而,利用天然聚合物制备超疏水材料和超疏水涂层仍然缺乏一种简单、经济的方法。本文通过取代反应制备了超疏水性木质素-PFTEOS粉体。由于该粉体与基体无关的特性和优异的超疏水性,可用于各种基体制备超疏水性涂层。所制备的涂层疏水性极强,水接触角最高可达169°,同时具有良好的耐摩擦、耐酸碱、耐盐性能和较好的耐腐蚀性能:经砂纸摩擦循环20次或在1 mol/L HCl、0.20 mol/L Na OH和1 mol/L Na Cl溶液中浸泡30 min后,涂层仍保持超疏水性能,且接触角大于150°。这种低成本、可降解和可扩展的木质素基涂层在不同领域具有巨大的应用潜力,并为碱木质素的增值利用提供了一种简单的方法。

Superhydrophobic coatings have drawn much attention in recent years for their wide potential applications.However,a simple and cost-effective approach is still needed for preparing superhydrophobic materials and coatings using natural polymer.Herein,a hierarchical superamphiphobic Lignin-PFTEOS powder was prepared via a substitution reaction.Owing to the substrate-independent characteristics and excellent superrepellency of the powder,it could be applied to various substrates to fabricate superhydrophobic coatings.The prepared coatings have a huge repellency to water,with a water contact angle of 169°,as well as good friction resistance,acid resistance,alkali resistance,salt resistance properties and quite good corrosion resistance performance.After 20 cycles of sand friction or being immersed in 1 mol/L HCl,0.20 mol/L NaOH and 1 mol/L NaCl solution for 30 minutes,the coatings still retain superhydrophobic capability,with contact angle higher than 150°.Due to its low cost,biodegradability and scalability,lignin-based coatings have huge potential applications in different fields and provide a simple method for the value-added utilization of alkali lignin.