Biodegradable coated paper materials represent one of the most promising alternatives to petroleum-based materials, including plastics and plastic–paper composite materials. Herein, fully biodegradable and food-safe coated paper substrates are reported with excellent water- and oil-resistant properties. The fabrication approach is facile and economical and utilizes a dual-layer coating that is obtained via the application of a base layer comprising polyvinyl alcohol to offer oil repellency and the subsequent application of a zein-based coating as a hydrophobic top layer. The water and oil resistances of the obtained coated paper were evaluated based on their Cobb60 values, water vapor transmission rate, kit rating, and contact angles. The obtained coated paper shows outstanding water- and oil-resistant performance with Cobb60 values below 3.00 g/m² and kit ratings reaching up to 12/12. Scanning electron microscopy results validated the absence of any pores on the coated paper. Thermogravimetric analysis was performed to determine the thermal stability along with the coating content of the paper substrate. The closed-loop nature of this approach was validated via pulp recovery from coated paper with benign solvents.

中文翻译：

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玉米蛋白和基于PVOH的双层方法，用于无塑料，可再浆化和可生物降解的耐油和耐水纸，替代一次性塑料

可生物降解的涂料纸材料是石油基材料（包括塑料和塑料纸复合材料）最有希望的替代品之一。在此，据报道具有良好的耐水和耐油性能的可完全生物降解和食品安全的涂布纸基材。该制造方法是容易且经济的并且利用双层涂层，该双层涂层是通过施加包含聚乙烯醇的基础层以提供拒油性并且随后将玉米蛋白基涂层用作疏水顶层而获得的。基于得到的涂布纸的Cobb60值，水蒸气透过率，试剂盒等级和接触角，评价其耐水性和耐油性。所得涂布纸显示出优异的耐水和耐油性能，Cobb60值低于3.00 g / m²，套件额定值达到12/12。扫描电子显微镜结果证实涂布纸上没有任何孔。进行热重分析以确定热稳定性以及纸基材的涂层含量。通过使用良性溶剂从涂布纸中回收纸浆，验证了该方法的闭环性质。