Nanomaterials have great application prospects in naval ship equipment field, and ship coating is one of the important application directions.
As a part of ship stealth materials, the special effect of nanomaterials provides a new way for stealth materials and a new absorbing mechanism. According to the research, nanometer multilayer composite film is expected to be a new material with high strength and microwave absorption with a certain bandwidth. A company in the United States has used an ultrafine ceramic ball powder in protective coatings for equipment that provides stealth capability and can be coated on electronic devices to counter electronic interference. It absorbs 99% of radar waves and is only micron thick.
The composite powders of nano alumina, ferric oxide, silicon oxide and titanium oxide combine with high molecular fiber to have strong absorption performance to the infrared band, which has a good shielding effect to the infrared detector of this band. By adding this kind of material to the coating, it not only has the good characteristic of absorbing radar wave but also has the good performance of absorbing and dissipating infrared ray, as well as obvious stealth function.
The key technologies of submarine camouflage coatings are wet reflectance and aging resistance. The application of nano-scale dark pigments such as carbon black, iron black and other dark pigments may be one of the effective ways to reduce the wet reflectance and aging resistance of camouflage coatings.
Hull coating and bottom antifouling coating
The agglomeration of nano silica is an amorphous white powder with a three-dimensional reticular surface. It has a strong ultraviolet absorption, infrared reflection characteristics, so it can improve the anti-aging properties of coatings.
Marine antifouling coatings have always been one of the most special and difficult materials in marine coatings. As countries around the world pay more and more attention to environmental protection, it is a definite time to ban the use of organic tin antifouling agents in a comprehensive manner, and the development of new and efficient antifouling agents has become the focus of marine paint researchers in various countries. Using nano-scale antifouling agents such as nano-cuprous oxide and nano ZnO may be an effective way.
Nanomaterials such as nano titanium dioxide and nano zinc oxide can be used as antibacterial agents that are non-toxic, with wide antibacterial range and good thermal stability. Non-metallic materials and coatings used in ship compartments are highly susceptible to mold and contamination due to their frequent exposure to moist and small spaces, especially in subtropical and tropical marine environments. A new kind of high-efficiency anti-bacteria and anti-mildew materials and coatings in the cabin can be prepared by using the antibacterial action of nanomaterials.
Ship flame-retardant coating
The fireproofing capability of ships is the key factor that affects the safety of ships, especially the combat and survivability of ships. Some nanoparticles have the flame retardant function, such as nano zinc oxide can be added as the flame retardant to ship cabin decoration materials or made into the flame retardant paint to improve the fire resistance of ship non-metal decorative materials and flame retardant coatings.