Rice husk ash biosilica toughened epoxy coating

A new study focuses on the thermal, mechanical and barrier properties of rice husk ash biosilica toughened epoxy biocomposite coating for structural application.

A woman pours rice husks from a basket.
The biosilica-epoxy composites could be applied as coating material for corrosion-prone metallic surfaces and other household coating applications.  Image source: danielkirsch - Pixabay (symbol image).

The mechanical, thermal, and barrier characteristics of an epoxy biocomposite coating made using rice husk biomass biosilica were investigated in this study. The primary objective of the research was to find out whether and how adding biosilica from biomass rice husks improve the polymeric coating material’s properties and adopted as sustainable coating element.

Enhanced properties

According to test results, the tensile and flexural properties were improved by the inclusion of silica particles up to 1 and 2 vol%. However the properties are reduced when the biosilica amount was increased up to 4 vol%. In contrast, the hardness and thermal conductivity of the 4 vol% of biosilica dispersed composite was 94 shore-D and 0.42 W/mK, respectively. In terms of mass loss stability, the 4 vol% biosilica dispersed composite outperformed. After the biosilica particle was added, the barrier behavior showed good resistance to oxygen penetration. However, the stability of water permeation was moderately affected. As a coating material for corrosion-prone metallic surfaces and other household coating applications, these mechanically enhanced, thermally strengthened, and barrier property strengthened biosilica-epoxy composites could be applied.

The study has been published in Progress in Organic Coatings, Volume 172, November 2022.

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