Organic-inorganic hybrid coatings for coil coating application based on polyesters and tetraethoxysilane [Review]

摘要

Organic-inorganic hybrid coating systems based on polyesters and tetraethoxysilane (TEOS) are synthesized and evaluated to develop protective coatings with improved performance for prefinish construction steel and aluminium. The coatings have to combine flexibility, necessary for enduring deformation of the metal substrate after coating, and hardness for improved mechanical properties, Two systems have been studied: a polyester-TEOS system and a polyester-epoxide-TEOS system. The polyester-TEOS system contains polyester oligomers which are crosslinked with silica clusters, formed via the sol-gel process. The polyester-epoxide-TEOS system consists of an organic network of polyester and epoxide with silicon compounds? formed by the sol-gel process, Both systems form transparent hybrid organic-inorganic coatings. The influence of the inorganic compound on the Konig hardness of the coatings is determined. The polyester-TEOS system shows an increase in hardness with increasing silica content. It appeared difficult to incorporate in situ formed silica in the organically crosslinked polyester-epoxide-TEOS system. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 18]