The reason why solid resin can be the core component of a high-temperature protective coating lies in its unique chemical structure and physical properties. The high-temperature-resistant functional groups contained in these resin molecules, such as aromatic rings, heterocycles, and cross-linking bonds, can form a stable three-dimensional network structure in a high-temperature environment, protecting the substrate from heat erosion. Compared with liquid resin, solid resin has a higher molecular weight and a more compact molecular chain arrangement. After the coating is cured, the porosity is extremely low, effectively reducing the penetration channels of high-temperature gases and corrosive media. 
In high-temperature conditions, the thermal stability of solid resin plays a crucial role. High-quality solid resin can withstand continuous high temperatures ranging from 200 to 1000 degrees Celsius. Its glass transition temperature is much higher than that of conventional polymer materials, and it will not undergo softening or flowing failure due to temperature increase. At the same time, the resin will undergo a slight carbonization reaction at high temperatures, forming a dense carbon film. This carbon film can reflect some heat and slow down the heat conduction rate, further enhancing the protective effect. 
In addition, solid resin has excellent compatibility with pigments and fillers. It can form a synergistic system with ceramic powders, metal oxides, etc., which are high-temperature-resistant fillers. The resin acts as a binder, firmly encapsulating and adhering the fillers to the substrate surface. This not only ensures the mechanical strength of the coating but also, by leveraging the high-temperature resistance of the fillers, jointly builds a multi-dimensional high-temperature protective barrier, providing long-term protection for steel,有色金属， and other substrates.