Polyimide Silicone Coatings Manufactured by Moisture/Heat Dual Curing
Developing coatings with high thermal resistance and strong adhesion is both necessary and challenging.Using maleic anhydride and 3-aminopropyl dimethoxymethylsilane as raw materials,a curable bismaleimide monomer,PMI,was synthesized via a one-pot method.A series of polyimide-silicone coatings were then obtained through a moisture/heat dual-curing process by reacting PMI with 3-(isocyanato)propyl trimethoxysilane.Subsequently,a partial curing process was conducted on PMI and 3-(isocyanato)propyl trimethoxysilane in a humid environment through deethanolization.Finally,the ultimate coating was successfully obtained through thermally initiated free radical polymerization.The resulting pre-polymer molecular skeleton consists of imide bonds,forming strong hydrogen bonds and silicon-oxygen bonds,which contribute to the stability and adhesion of the prepared coating under high-temperature conditions.The coatings were characterized through water contact angle,high-temperature resistance,surface morphology,adhesion,and hardness tests.The impact of crosslinking density on the performance of cured polysiloxane coatings was explored.Overall,the prepared coatings exhibit characteristics such as high-temperature resistance,strong adhesion,and high hardness,showing significant potential in the field of high-temperature protection.
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