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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Hybrid coating shows self-cleaning performance

Tuesday, 30 October 2012

A nanodispersion of surface-functionalized fumed silica was incorporated into an acrylic paint formulation. The hybrid coating showed significantly lower dirt pick-up than the equivalent paint formulation without nanosilica additive

Researchers have developed a hybrid coating with low dirt pick-up

Source: Luminis/Fotolia

Researchers have developed a hybrid coating with low dirt pick-up

Source: Luminis/Fotolia

In a new project, researchers Catarina Carneiro, Ricardo Vieira, Adélio M. Mendes und Fernão D. Magalhães have incorporated a nanodispersion of surface-functionalized fumed silica into an acrylic paint formulation. SEM imaging indicated good dispersion of silica within the polymer matrix. This hybrid coating showed significantly lower dirt pick-up than the equivalent paint formulation without nanosilica additive, towards both organic and inorganic ashes. Washing with running water further decreases dirt retention. This self-cleaning performance remained unchanged after several dirt/washing cycles, during a 1-month period. Surface hardness measurements indicated no significant differences between the original and composite paint films. The lower dirt pick-up was attributed to nanoroughness created by the nanosilica particles present in the film.

A full paper on this project appeared in Journal of Coatings Technology and Research, Volume 9, Number 6 (2012), 687-693, DOI: 10.1007/s11998-012-9407-9.

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