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15. Sep 2021 | Application Areas

Transparent wood coating for weathering resistance

A UV-shielding, hydrophobic and transparent coating was developed to improve the weathering resistance properties of wood materials while maintaining the natural aesthetic texture of the wood.
The composites were coated on wood surface for weathering resistance.
Image source: Skitterphoto - Pixabay (symbol image).

For the novel coating, graphitic carbon nitride nanosheets (gCNNS) were used as nontoxic and metal-free UV absorber. Cellulose nanofibril (CNF) was selected as an environment-friendly and renewable film-forming carrier, which addressed the issues of agglomeration and low composite adhesion of gCNNS on the wood surface. The gCNNS/CNF composite coating was formulated on the wood surface via spin coating method.

Coatings can be applied to a wide variety of substrates

A following hydrophobic treatment by thermal chemical vapor deposition (CVD) method was to solve the problem of rainwater erosion in outdoor application. After 15-day accelerated weathering tests, the total colour change of the treated sample was 79.6% lower than that of the untreated one. As the scientists report, the newly-designed environment-friendly and weathering resistant coatings can be applied to a wide variety of substrates in the future.

The study has been published in Progress in Organic Coatings, Volume 159, October 2021.

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