Fluorosilicone, leveraging the structural advantages of its silicon-oxygen backbone and fluorine-containing side groups, inherently possesses a wide temperature range adaptability of -55℃ to 230℃. However, the demand for high-temperature stability in the high-end field has driven the upgrading of modification technologies. The scientific combination of inorganic oxide fillers has become the core path to enhance thermal resistance, and the composite doping system shows the best effect.
Research indicates that iron-doped titanium dioxide (TiO₂/Fe₂O₃) is an outstanding thermal-resistant modifier. When the mass fraction is 2%, the 5% heat loss temperature of the fluorosilicone can reach 453℃, which is 47℃ higher than the blank sample, significantly outperforming a single oxide filler. Its core mechanism of action is to inhibit the oxidation decomposition of the fluorine-containing side groups, delay the chain break process of the main chain, and after 1000 hours of 250℃ hot air aging, the tensile strength retention rate still reaches 82%. Comparative experiments show that the ranking of thermal resistance enhancement effects of different fillers is TiO₂/Fe₂O₃ > TiO₂ > Fe₂O₃ > CeO₂ > Al₂O₃.
Collaborative optimization of the formulation is also crucial. Using silicon-nitrogen surface-treated aerogel silica as reinforcing filler and combining with phenyl trimethylketoxime-based silane crosslinker, it can enhance thermal resistance while improving processing fluidity. This modified fluorosilicone has a continuous working life of over 10,000 hours at 230℃, with a peak temperature resistance of up to 350℃, successfully adapting to high-temperature scenarios such as aircraft engine seals and automotive exhaust pipe gaskets, and solving the pain point of traditional materials prone to aging and failure.