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Sunday, 22 September 2019
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Raw materials & technologies, Science today - coatings tomorrow

Hybrid coatings show improved properties

Monday, 4 February 2013

Brazilian researchers investigated organic-inorganic coatings based on epoxidised castor oil. The films exhibited good adhesion to the aluminum surface and showed very good anti-corrosive properties.

Aluminum coated with the films and submitted to intensive corrosion test showed very good protection / Source: Fotolia

Aluminum coated with the films and submitted to intensive corrosion test showed very good protection / Source: Fotolia

Two series of hybrid films from epoxidised castor oil (ECO) and the inorganic precursor titanium (IV) isopropoxide (TIP) have been prepared, combined with silicon precursors with different organic to inorganic proportions.

Films were pre-cured at room temperature under an inert atmosphere and submitted to thermal curing. The macro- and microscopic properties of the films, including adhesion, hardness, microstructure and thermal properties, were determined as a function of the proportion of the ECO to inorganic precursors.

Morphological studies showed that the hybrid films were microscopically homogeneous. The addition of TIP decreased substantially the curing time. The hardness and tensile strength of the films increased with increased concentration of inorganic precursor. The combination of the silicon-rich inorganic precursors with TIP improved the mechanical strength of the films. All films exhibited good adhesion to the aluminum surface. Additionally, the films showed very good protection against corrosion.

Read the complete study "Organic–inorganic coatings based on epoxidized castor oil with APTES/TIP and TEOS/TIP” by Denize Maria Bechi, Maria Augusta de Luca, Márcia Martinellia, Sydnei Mitidieri in the Progress in Organic Coatings.

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