Organosilicon compounds have many unique and excellent physical and chemical properties, which have long attracted people's attention, and the research on polysilazane with Si-N bond structure has also made great progress in recent decades. Although the research focus of polysilazane is only in ceramic synthesis, high temperature resistant silicone rubber and composite materials, its potential application in coatings is also gradually favored by people. Polysilazane contains silicon-nitrogen bonds and nitrogen-hydrogen chains. These chemical bonds endow it with many specific properties. Although the mechanism of their action is not fully understood, these properties play a very important role in coatings.

Polysilazane is widely used in paint and varnish formulations and exerts its excellent weather resistance, UV resistance, corrosion resistance, stain resistance, graffiti resistance, scratch resistance, heat resistance and other properties. The dry film thickness of polysilazane varnish is usually between 10 nm and 2 μm. Compared with aminoalkyd varnish system and two-component polyurethane varnish system, polysilazane varnish has better gloss retention and weather resistance; Compared with silicone-modified polyester varnish systems, polysilazane varnishes have better heat resistance. The aluminum coated with polysilazane coating has no corrosion after 2 400 h salt spray resistance test (ISO 7253-2001); the steel coated with polysilazane coating has passed 2 400 h condensed water test (ISO 6270.2-2001). 2005), there is still no corrosion. The water contact angle of polysilazane coatings is about 95° and can be maintained for a long time, and with appropriate additives, the water contact angle can be increased to more than 120°. This coating is low viscosity, solvent-free, fluorine-free, and has excellent adhesion to most substrates, as well as high hardness (9H+).

When the polysilazane is heated to a minimum of 450°C, the polymer will finally be converted into an inorganic ceramic (SiOx), which has extremely high hardness (9H) and ultra-high heat resistance (up to 1 800°C) . In addition, polysilazane can be combined with most resins that do not chemically react with it, such as thermoplastic acrylic, silicone, organic polysilazane and inorganic polysilazane mixtures to form cold blends.