Advancing polyallophanate powder coating performance and function with colloidal lignin particles.
- 1Escuela de Química, Universidad Industrial de Santander Bucaramanga Santander Colombia [email protected].
- 2Leibniz Institute of Polymer Research Dresden Germany.
- 3Max Bergmann Center of Biomaterials Dresden (MBC) 01069 Dresden Germany.
Abstract
Polyallophanate powder coatings are increasingly attractive as sustainable, solvent-free finishing materials, yet their performance and functionality remain limited by the properties of conventional additives. Colloidal lignin particles (CLPs) offer a renewable alternative with intrinsic antioxidant, UV-absorbing, and antibacterial characteristics. In this study, CLPs were produced from organosolv lignin derived from palm oil lignocellulosic residues using three particle size-reduction approaches: sonication, antisolvent, and hybrid. The hybrid method produced the most stable dispersions, yielding spherical CLPs with reduced particle size and increased surface area compared to native lignin. CLPs were incorporated at 1-5 wt% into petroleum-based and lignin-based polyallophanate powder coating formulations to evaluate their influence on thermal, mechanical, surface, antibacterial, and UV-aging behavior. CLP addition enhanced the thermal stability of those petroleum-based coating systems and imparted measurable antibacterial activity against Staphylococcus aureus in both coating systems. CLPs also increased color change and gloss loss under UVB exposure, indicating their applicability as light-absorbing fillers. However, incorporating CLPs reduced the impact resistance of polyallophanate powder coatings, particularly at higher loadings. Overall, the results demonstrate that CLPs can impart new functional properties such as antibacterial behavior, while contributing to thermal reinforcement, highlighting their potential as bio-derived nano-additives for more sustainable and multifunctional powder-coating technologies.
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BibTeX
@article{onategutierrez2026advancing,
title = {{Advancing polyallophanate powder coating performance and function with colloidal lignin particles.}},
author = {Jesús A Oñate-Gutiérrez and Ralf Helbig and Lars D Renner and Cristian Blanco-Tirado and Julio R Pinzón and Marianny Y Combariza and Michaela G-Smolka},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra05887f},
url = {https://europepmc.org/article/MED/42835531},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Advancing polyallophanate powder coating performance and function with colloidal lignin particles.
AU - Jesús A Oñate-Gutiérrez
AU - Ralf Helbig
AU - Lars D Renner
AU - Cristian Blanco-Tirado
AU - Julio R Pinzón
AU - Marianny Y Combariza
AU - Michaela G-Smolka
PY - 2026
DA - 2026/10/05
JO - RSC advances
DO - 10.1039/d6ra05887f
UR - https://europepmc.org/article/MED/42835531
AB - Polyallophanate powder coatings are increasingly attractive as sustainable, solvent-free finishing materials, yet their performance and functionality remain limited by the properties of conventional additives. Colloidal lignin particles (CLPs) offer a renewable alternative with intrinsic antioxidant, UV-absorbing, and antibacterial characteristics. In this study, CLPs were produced from organosolv lignin derived from palm oil lignocellulosic residues using three particle size-reduction approaches: sonication, antisolvent, and hybrid. The hybrid method produced the most stable dispersions, yielding spherical CLPs with reduced particle size and increased surface area compared to native lignin. CLPs were incorporated at 1-5 wt% into petroleum-based and lignin-based polyallophanate powder coating formulations to evaluate their influence on thermal, mechanical, surface, antibacterial, and UV-aging behavior. CLP addition enhanced the thermal stability of those petroleum-based coating systems and imparted measurable antibacterial activity against Staphylococcus aureus in both coating systems. CLPs also increased color change and gloss loss under UVB exposure, indicating their applicability as light-absorbing fillers. However, incorporating CLPs reduced the impact resistance of polyallophanate powder coatings, particularly at higher loadings. Overall, the results demonstrate that CLPs can impart new functional properties such as antibacterial behavior, while contributing to thermal reinforcement, highlighting their potential as bio-derived nano-additives for more sustainable and multifunctional powder-coating technologies.
SN - 2046-2069
ER -