|Nano Faraz Sepahan|
Construction Masonry MaterialsWaterproof Solution
Hydrophobic Without chemical and harmful effect Easy to clean Durable water repellent Long-term stability Inhibition of changing the appearance of painted surfaces Resistance to UV radiation
Water contact with the painted surfaces of parts and structures reduces the color quality. Today, for a number of reasons, such as beauty and energy consumption, and of course reflection of sunlight in hot cities, the use of glass or shiny coatings on buildings are considered. Furthermore, the body of vehicles is also one of the other important applications of a variety of polished coatings. In the building and car body surfaces, the stains caused by dust and rain can make it look messy and change the appearance. Cleaning the building and car body using water is a common but costly method. A good alternative to these methods is to apply hydrophobic coatings. Application of these coatings causes water particles to not adhere to the surface and also to remove dirt or particles from the surface by water droplets. The use of colloidal coatings containing nanoparticles creates a very high contact angle (usually over 100 degrees) as well as low surface energy and reduces the capillary property between the water droplets and the surface and creates a spherical shape in the droplets which results in easy moving on the surface. As a result, stains on the surface are prevented and no need for continuous washing and use of acidic detergents, as well as preventing blurring of painted surfaces.
Due to the embeding of nanoparticles in the polymeric base, the proper hydrophobic property is created on the surface of paint and coatings. Micro and nano sized roughness due to the presence of nanoparticles, reduce the surface adhesion force between droplets of water and the surface of the coated surface. On the other hand, the results of measurements of water contact angle are given in the table below. Increasing the contact angle by applying coatings containing nanoparticles changes the water droplets to a sphere shape condition and prevent them from sticking to the coated surface. Based on article 4-4 of the Iran-ISO national standard number 80004-2, the presence of silica nanoparticles in this product is confirmed.