Nanomaterials have unique optical, electrical and magnetic properties. When applied in coatings, it can not only play the role of modification but also produce various functional coatings, such as anti-radiation, anti-aging, antibacterial, sterilization, stealth and other special functions.
Chameleon effect coating
The particle size of Nano titanium dioxide crystal is about 1/10 of that of ordinary titanium white powder, which is much lower than the wavelength of visible light (390nm ~ 780nm). It is transparent in itself and has a certain degree of coverage to visible light. The reflection of transmitted light on the surface of aluminum powder has different visual effects than that on the surface of Nano titanium dioxide.
When Nano-grade titanium dioxide is mixed with aluminum powder or mica pigment coated with Nano-sized titanium dioxide is added to the coating, the coating can produce mysterious and changeable Chameleon effect.
Military stealth coating
A successful application example of inorganic Nanomaterials is the preparation of military stealth coatings, which is attributed to the large specific surface area and excellent absorption characteristics of nanometer ultrafine powders. Besides that, nanoparticles are smaller than infrared and radar wavelengths, so the coatings can evade radar detection in a wide range of frequencies and also have infrared stealth.
It has been found that Nano TiO2, Nano SiO2, Nano ZnO and Nano Fe2O3 are all excellent anti-aging agents, which can improve the weatherability of the coating. The anti-aging property of nanoparticles makes use of its special function of light scattering and absorption. Nano SiO2 is an amorphous white powder (referring to agglomeration state), which also has the characteristics of ultraviolet absorption and infrared reflection. Due to the existence of a large number of unsaturated residual bonds and different hydroxyl groups in its molecular structure, the molecular structure is a three-dimensional silica structure, which can be used to bond with some groups of resin and greatly improved the thermal stability and chemical stability of materials.
Nano ZnO is a kind of semiconductor and is white or transparent, which will have a place in white or light color anti-static coatings. Researchers in the United States and other countries have used Nano TiO2, SnO2, Cr2O3 and other resins to prepare anti-static coatings, and found that the electrostatic shielding performance of such coatings is better than that of conventional resin-based and carbon-black coatings, and they can change the color of paint according to the type of oxide.
Nanomaterials can enhance the antibacterial and air static properties of coatings. Nano-antibacterial coatings can be prepared by mixing Nano-antibacterial materials such as Nano titanium oxide, zinc oxide, and silver Nano-antibacterial materials into coatings. Coating nanometer antibacterial coatings in the product surface that people often come into contact with such as furniture, sanitary ware, wall, floor, etc. have a very good antiseptic effect.