Abstract The conservation and protection of ancient buildings and art-works made of stone materials, that constitute the Cultural Heritage of each Country, are very delicate tasks involving different experts and disciplines. The most common and successful method for protecting the stone-made constructions and art-works consists in applying on their surfaces protective layers of polymers having oleo-hydrophobic character. Polymer materials themselves can undergo degradation if they interact with external agents, thus reducing their protective features. The durability of the protected stones is the subject of many investigations in the last decades, but, among the agents able to severely affect the treated stone substrates outdoor exposed, only little attention has been paid so far to the effects of bird droppings, also known as guano. This work would contribute to fill this gap, assessing the effects due to bird excreta on two kinds of stone (a very porous, Lecce stone, and a more compact, Trani stone) protected with an experimental polymer coating containing SiO2 nanoparticles in comparison with two commercial protective polymer products. Color, surface hydrophobicity, water vapor permeability, and capillary water absorption were evaluated before and after exposure to pancreatin, used to simulate bird droppings. Different behaviors were observed depending on the stone porosity and the nature of the polymer coating. Good performance was obtained using the coatings with nanoparticles.

中文翻译：

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用于保护石材的纳米填充油/疏水涂层对模拟鸟粪的耐久性

摘要 古建筑和石雕艺术品是各国文化遗产，保护和保护是一项涉及不同专家和学科的非常棘手的任务。保护石材建筑和艺术品的最常见和最成功的方法是在其表面涂上具有疏水性的聚合物保护层。如果聚合物材料与外部试剂相互作用，它们本身会发生降解，从而降低其保护功能。受保护石材的耐用性是过去几十年中许多研究的主题，但是，在能够严重影响室外暴露的处理过的石材基材的试剂中，迄今为止很少关注鸟粪的影响，也称为作为鸟粪。这项工作将有助于填补这一空白，评估鸟类排泄物对两种石头（一种非常多孔的 Lecce 石头和一种更致密的 Trani 石头）的影响，这些石头用含有 SiO2 纳米颗粒的实验聚合物涂层保护，与两种商业保护性聚合物产品。在暴露于胰酶之前和之后评估颜色、表面疏水性、水蒸气渗透性和毛细管吸水率，用于模拟鸟粪。根据石材孔隙率和聚合物涂层的性质，观察到不同的行为。使用具有纳米颗粒的涂层获得了良好的性能。Trani 石）与两种商业保护聚合物产品相比，用含有 SiO2 纳米颗粒的实验聚合物涂层保护。在暴露于胰酶之前和之后评估颜色、表面疏水性、水蒸气渗透性和毛细管吸水率，用于模拟鸟粪。根据石材孔隙率和聚合物涂层的性质，观察到不同的行为。使用具有纳米颗粒的涂层获得了良好的性能。Trani 石）与两种商业保护聚合物产品相比，用含有 SiO2 纳米颗粒的实验聚合物涂层保护。在暴露于胰酶之前和之后评估颜色、表面疏水性、水蒸气渗透性和毛细管吸水率，用于模拟鸟粪。根据石材孔隙率和聚合物涂层的性质，观察到不同的行为。使用具有纳米颗粒的涂层获得了良好的性能。根据石材孔隙率和聚合物涂层的性质，观察到不同的行为。使用具有纳米颗粒的涂层获得了良好的性能。根据石材孔隙率和聚合物涂层的性质，观察到不同的行为。使用具有纳米颗粒的涂层获得了良好的性能。