Currently, high-temperature resistant coatings on the market are mainly divided into inorganic and organic types. Inorganic coatings include ceramic, silicate, phosphate, and zinc-rich primer coatings, while organic options consist of fluororesin, heterocyclic polymer, and silicone-based coatings. Fluororesin coatings are a type of coating that uses fluorinated resins as the main film-forming substance. They are also known as fluorocarbon lacquers or fluorine coatings. These materials have excellent properties such as weather resistance, heat resistance, low-temperature resistance, and chemical resistance. This is due to the high electronegativity of fluorine and the strong fluorocarbon bonds within the material. Additionally, they offer non-stick and low-friction characteristics. The technology behind fluororesin coatings originated in the United States at DuPont in 1938, and it made a significant impact on the global chemical industry with its outstanding physicochemical properties. Among organic high-temperature coatings, silicone resin stands out due to the high bond energy of the Si-O bond, which reaches up to 443 kJ·molâ»Â¹. This makes silicone resin an ideal choice for high-temperature applications. It offers several advantages: (1) Excellent thermal stability: The Si-O bond has a higher covalent bond energy than the C-C bond found in typical organic polymers. This helps maintain the structural integrity of the polymer even under high temperatures. When exposed to heat, the hydrocarbon groups in the polymer form a crosslinked Si-O-Si network, creating a protective layer that shields the inner structure from degradation. (2) Strong oxidation resistance: The large difference in electronegativity between silicon and oxygen creates a highly polar Si-O bond. This polarity acts as a barrier, protecting the attached organic groups from oxidative damage. (3) Unique molecular structure: Silicone polymers consist of a backbone made of alternating silicon and oxygen atoms, with various organic groups attached to the silicon. This hybrid structure combines the flexibility and processability of organic materials with the stability and durability of inorganic components. As a result, silicone resin exhibits remarkable properties like weather resistance, heat resistance, gloss retention, acid and water resistance, electrical insulation, and chemical stability. Some varieties are also resistant to radiation, oil, and solvents. Current research in high-temperature coatings focuses on improving their performance by enabling room-temperature curing, enhancing resistance to high temperatures and corrosion, and expanding their operational temperature range. Scientists are working towards developing coatings that can provide long-term protection at extreme temperatures, ranging from 800°C to 1800°C or even higher. These advancements aim to meet the growing demands of industries such as aerospace, automotive, and power generation, where reliable high-temperature protection is essential. Wuxi Ding Guohua Hand drawn Wallpaper Co., Ltd , https://www.silkwallpaperasia.com
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