ステンレス鋼板上へのCH₃Si(OC₂H₅)₃とブロックイソシアネートからのハイブリッド膜のコーティング

抄録

Coating films prepared from methyltriethoxysilane (MTES) showed flexibility and good adhesion to stainless steel sheets (SUS). However, it is necessary for the coated SUS substrates to have more flexibility in the practical use, because these materials are usually subjected to the vigorous forming processes in the practical use. In this study, organic-inorganic hybrid coatings were prepared by the incorporation of the blocked isocyanate into the sol prepared from MTES. It was found that the thermally altered blocked isocyanate, and free N=C=O groups were regenerated, which were successfully cross-linked to the inorganic network derived from MTES during the firing process. Elongation of the hybrid films was increased with an increase in the content of incorporated blocked isocyanate. Adhesion of the MTES-derived coating films to SUS substrates was drastically improved by the hybridization. The good adhesion of the hybrid films was achieved by suppression of the crack formation at the bent portions.