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Tuesday, 28 January 2020
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Raw materials & technologies, Technologies

Sustainable components for polyurethane coatings

Monday, 13 January 2020

The antioxidant activity of unmodified kraft and organosolv lignins has been studied to be used as sustainable components for polyurethane coatings.

The study aims at finding sustainable components for polyurethane coatings. Image source: OpenClipart-Vectors / Pixabay.

The study aims at finding sustainable components for polyurethane coatings. Image source: OpenClipart-Vectors / Pixabay.

Scientists have studied the antioxidative capacity of four different kraft lignins (KL) and one additional organosolv lignin (OSL) using the Folin–Ciocalteu (FC) assay.

To do so, the corresponding FC assay procedure was adapted and optimised to be appropriate for lignin analysis. Different solvents were tested, and DMSO and saturated sodium carbonate (Na2CO3) for pH adjustment showed the best results. The absorption wavelength of 740 nm was chosen due to highest determination coefficients.

Higher antioxidant activity for kraft vs organosolv lignins

The antioxidant capacity and related radical scavenging activity of various lignins were correlated with the biomass nature (soft wood vs grasses) and pulping methods (kraft vs organosolv). The results show higher antioxidant activity for kraft vs organosolv lignins. First lignin-derived polyurethane coatings were prepared using the unmodified kraft lignin. The films, prepared via spin coating, show a high flexibility and transparency.

The study can be found in Journal of Coatings Technology and Research, Volume 16.

Image source: Pixabay.

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