Novel amphiphilic crosslinked architecture in coatings for enhanced high-voltage corrosion resistance
Epoxy resins often develop microporous defects during curing, compromising their barrier properties. This study addresses this issue through the synthesis of a multifunctional mica-based filler (AUFBTM) by in situ growth of TiO 2 on mica via sol-gel method, followed by reduction to black TiO 2 , fluorination, and photocatalytic citric acid modification. The resulting filler features a unique ‘hydrophobic protection-interfacial anchoring-chemical crosslinking’ triple-functional structure. When incorporated into epoxy resin, the EP/AUFBTM coating exhibits significant performance improvements: an 18.7 % reduction in wear mass and outstanding corrosion resistance with a maintained impedance modulus of 2.49 × 10 10 Ω·cm² after CO 2 exposure-three orders of magnitude higher than the unmodified coating (20 % TM) and one order of magnitude higher than the fluorinated modified coating (20 % FBTM). These performance improvements result from the following synergistic effects: the fluorine groups on the filler give the coating excellent shielding properties, while the hydroxyl groups on the surface realize effective interfacial anchoring between the filler and the resin system, and finally, the chemical cross-linking between the carboxyl groups and the resin system builds a stable and dense three-dimensional crosslinking network system in the coating, which effectively improves the densification and interfacial bonding strength of the coating. This study not only provides novel insights into the design of amphiphilic conversion fillers but also advances the application of mica in long-term corrosion protection coatings.
危险品化学品经营许可证（带存储）