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首页> 外文期刊>Journal of coatings technology and research >Surface characterization of some porous natural stones modified with a waterborne fluorinated polysiloxane agent under physical weathering conditions
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Surface characterization of some porous natural stones modified with a waterborne fluorinated polysiloxane agent under physical weathering conditions

机译：在物理风化条件下用水性氟化聚硅氧烷改性的某些多孔天然石材的表面特性

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摘要

Understanding the surface behavior of a porous natural stone in contact with a water source is of great importance for predicting the interaction of a certain material with the surrounding medium. Water in porous building materials plays a crucial role through the degradation process and affects some mineralogical and chemical compositions of the material. In this study, naturally hydrophilic surfaces of the porous intraclastic limestone and welded tuff were modified with a waterborne fluorinated polysiloxane agent and were made impermeable to water by dip coating process. Attenuated total reflectance Fourier transform infrared spectroscopy was used to verify the presence of the fluorinated siloxane compound on the surface. Contact angle and capillary water absorption analyses show that the hydrophobic character is due to the fluorinated carbon chain on the surface giving repellency to water as low-energy film-forming substance. Verifications of the color of untreated and treated stones were evaluated with colorimetric measurements. The changes in the contact angle and the capillary water absorption with simulated physical weathering conditions such as freezing-thawing and thermal shock cycles are also discussed. The research indicates the hydrophobic character and the initial colors of the selected stones were preserved up to a certain degree under extreme temperatures.
机译：了解多孔天然石材与水接触的表面行为对于预测某种材料与周围介质的相互作用非常重要。多孔建筑材料中的水在降解过程中起着至关重要的作用，并影响材料的某些矿物学和化学组成。在这项研究中，多孔的碎屑内部石灰岩和焊接凝灰岩的天然亲水表面被水性氟化聚硅氧烷改性，并通过浸涂工艺使其对水不可渗透。衰减全反射傅里叶变换红外光谱用于验证表面上是否存在氟化硅氧烷化合物。接触角和毛细管吸水率分析表明，疏水性是由于表面上的氟化碳链使作为低能成膜物质的水具有排斥性。用比色法评估未处理和处理过的宝石的颜色。还讨论了接触角和毛细管吸水率随模拟物理风化条件（如冻融和热冲击循环）的变化。研究表明，所选宝石的疏水特性和初始颜色在极端温度下可以保留一定程度。

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