Due to the advantages of beautiful appearance, exterior wall real stone paint with properties of low cost and good weather resistance has been widely applied on concrete buildings for aesthetics and protection. However, the hydrophilicity of exterior wall real stone paint makes it susceptible to pollution by dust, acid rain and so on. Superhydrophobic coatings with excellent self-cleaning properties may effectively alleviate these problems, but the fabrication of real stone paint coatings with superhydrophobicity has not been reported yet. Here, the authors developed a superhydrophobic exterior real stone paint (SEP) coating with a water contact angle of 154 ± 3° and a rolling angle of 13 ± 2° through a simple and highly efficient physical blending method using an emulsion, natural sand, low-surface-energy reagents and nano-silicon dioxide (nano-SiO₂). The SEP coating possessed excellent self-cleaning properties for pollutants, including soil, dust and rust water, and had good anticorrosion capability and outdoor time stability. The SEP coating also showed better solar reflectance characteristics than the normal exterior real stone paint coating, which may contribute to lowering of temperatures in buildings during hot weather and saving energy. Besides, a colorful SEP coating for decorative requirements and a large-area SEP coating for practical application could be effectively fabricated, which are expected to have promising application prospects.

中文翻译：

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混凝土建筑外墙自洁涂料

外墙真石漆由于具有美观、成本低、耐候性好的优点，被广泛应用于混凝土建筑物的美观和防护。但外墙真石漆的亲水性使其容易受到灰尘、酸雨等污染。具有优异自洁性能的超疏水涂料可以有效缓解这些问题，但制备具有超疏水性的​​真石漆涂料尚未见报道。在这里，作者通过简单高效的物理共混方法，使用乳液、天然砂、₂）。SEP涂层对土壤、灰尘、锈水等污染物具有优异的自洁性能，并具有良好的防腐能力和户外时间稳定性。SEP涂层还表现出比普通外墙真石漆涂层更好的太阳光反射特性，这可能有助于在炎热天气下降低建筑物温度并节省能源。此外，还可以有效制备满足装饰需求的彩色SEP涂层和适合实际应用的大面积SEP涂层，预计具有广阔的应用前景。