Modifications of the packaging paper surface play an important role in a variety of industries, especially in the food sector. Uncoated paper has poor water and oil barrier properties due to its porous structure. In this study, packaging paper was successfully coated with six different coating solutions containing combinations of chitosan, zein and rosemary essential oil. The chitosan and zein were actually coated in two layers; the mixed chitosan–rosemary oil and the mixed zein–rosemary oil were each applied as one layer to the paper. The results showed increased oil barrier properties in the papers coated with mixed zein–rosemary oil and reduced water permeability in the papers coated with the chitosan–rosemary oil coating solution. The result of this two-layer coating showed excellent water (Cobb60 value of 2.18 g/m²) and oil barrier properties. All the coated papers showed a high thermal stability, especially those coated with chitosan, zein and rosemary oil layer by layer. Scanning electron microscopy was used to verify the surface differences of the coated papers, such as the closed structure, pores and smoother surface, especially in the layer-wise coated samples. Due to their good mechanical and chemical properties, coated papers with rosemary oil can be used in many applications, possibly also in the field of repellents.

中文翻译：

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包装纸上含有玉米蛋白和精油作为生物基涂料的壳聚糖溶液

包装纸表面的改性在许多行业中，特别是在食品领域中起着重要作用。未涂布纸由于其多孔结构而具有差的水和油阻隔性能。在这项研究中，包装纸成功地涂了六种不同的涂料溶液，其中包含壳聚糖，玉米蛋白和迷迭香精油的组合。实际上，壳聚糖和玉米醇溶蛋白被分为两层。壳聚糖-迷迭香混合油和玉米蛋白-迷迭香混合油分别以一层的形式涂在纸上。结果表明，用玉米醇溶蛋白-迷迭香混合油涂布的纸具有更高的隔油性能，而使用壳聚糖-迷迭香油涂布液涂布的纸的透水性降低。这种两层涂层的结果显示出优异的水（Cobb60值为2.18 g / m ²）和防油性能。所有涂料纸均显示出高的热稳定性，尤其是逐层涂覆壳聚糖，玉米蛋白和迷迭香油的纸张。扫描电子显微镜用于验证涂布纸的表面差异，例如封闭结构，孔和更光滑的表面，特别是在逐层涂布的样品中。由于它们具有良好的机械和化学性能，因此用迷迭香油制成的涂布纸可用于许多应用，可能还用于驱虫剂领域。