Nano-coating is a composite of nano-materials and coatings. Because nano-materials have at least one dimension in space ranging from 1nm to 100nm (nano-level), due to their size and scale characteristics, they have different properties from ordinary materials, which make the coating performance Significant improvement and new features.
In recent years, the application of nano-coatings has become more and more extensive, and it has gradually replaced traditional coatings in industries such as electronics, energy, food packaging, construction, shipbuilding, military defense, automobile manufacturing, aerospace, and medical treatment. In addition, the new functions of nano coatings, especially self-cleaning, anti-fouling, waterproof, anti-bacterial, anti-corrosion, and anti-friction, have opened up a larger market space.
Nano superhydrophobic coating
In modern product design, in addition to being used for decoration, the surface of the product also needs to have different special functions to increase the functional characteristics of the product, including the surface has a good touch and can maintain a good appearance for a long time, easy to maintain, and not easy to be damaged. It is stained, and it is not easy to leave water stains or fingerprints. Nano super-hydrophobic coating is mixed with nano-structured inorganic powder, the main component is silica, which makes the water contact angle of the solid coating greater than 150°, forms a super-hydrophobic effect on the surface, and provides anti-fouling, waterproof and self-cleaning effects .
Nano antibacterial coating
The research and development of antibacterial coatings is one of the main application directions of nano coatings. Nanoparticles of nano antibacterial coatings are added with antibacterial agents. When the coating comes into contact with bacteria, viruses or fungi, they will penetrate their outer membrane and quickly destroy them, making the coating have the function of inhibiting the growth and reproduction of microorganisms and pathogens.
Nano antibacterial coatings are used in clinics, hospitals, laboratories and even homes, as well as in the field of medical equipment to prevent and reduce bacterial infections. Currently, titanium dioxide, organosilane, carbon nanotubes and other nanoparticles are used in antibacterial coatings; however, due to the high reactivity of some nanomaterials, more research is needed on the ability of these materials to be used in antibacterial coatings.
According to the research of NACE International, the global annual corrosion cost amounts to 2.5 trillion US dollars, accounting for about 3.4% of global GDP. If anti-corrosion work is implemented, it can save 15% to 35% of global costs (or USD 37 to 875 billion). Therefore, anti-corrosion coatings have always been one of the important tools to challenge corrosion. There is a huge demand for anti-corrosion coatings in various industries around the world, which also promotes the continuous progress of anti-corrosion coating technology.
Modern new materials require more and more complex coatings to improve performance and corrosion resistance. For example: Graphene is used as a new surface coating. Graphene has the advantages of ultra-thin, ultra-light, hard, surface modifiable, high corrosion resistance, high wear resistance, etc., which can provide the greatest degree of protection under harsh environmental conditions. Metal corrosion. The nano-microcapsule technology is mixed into the paint to make the paint have a repair function; if the coating cracks, the capsule ruptures and releases the repair liquid, capillary action flows into the crack, prevents the crack from further expansion, thereby repairs the crack, and effectively provides the anti-corrosion function.
Anti-friction and tribological applications
The wetting effect refers to the phenomenon that the surface energy of the solid decreases when the liquid contacts the solid. For a long time, wetting has been the main research topic of physicists and materials engineers. From a physical point of view, the process of wetting is essentially the change of interface properties and interface energy; understanding this mechanism and using nanotechnology to construct surfaces to control wetting can be used in many aspects of our daily life, such as: Sticky pot, low friction coating of engine parts, contact lens comfort, etc.
Researchers in Ohio, USA, used a lining containing a repellent buffer on the inner wall of the (tomato sauce) bottle to allow the liquid to flow out quickly (not to be wasted due to a layer on the inner wall of the bottle that is not used up). This built-in repellent buffer coating uses silica nanoparticles and has a Y-shaped microstructure to reduce surface tension so that the remaining liquid can flow out smoothly.
According to a market research company Allied Market Research report, by 2022, the global nano coatings market is expected to reach a total value of 13.094 billion US dollars, with a compound annual growth rate of 21.0% from 2016 to 2022. With the development and application of nanotechnology and nanomaterials becoming more and more popular, the application of nano coatings in high-tech fields has become more and more extensive (especially in aerospace and medical fields), and it has gradually replaced the traditional coating application market.
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