The effect of lignin-based polyols on the properties of polyurethane coatings
| Autor: | Fatemeh Farhood Hassani Khorshidi, Saeed Kazemi Najafi, Farhood Najafi, Antonio Pizzi, Dick Sandberg, Rabi Behrooz |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Green Materials. :1-14 |
| ISSN: | 2049-1239 2049-1220 |
| DOI: | 10.1680/jgrma.23.00040 |
| Popis: | The aim of this research was to replace petroleum-based polyols with polyols made from lignin and nano-lignin in the production of polyurethane coatings. Lignin and nano-lignin were first reacted with either diethylenetriamine (DETA) or ethylenediamine (EDA). Subsequently, they were modified with propylene carbonate. The lignin and nano-lignin derived polyols replaced the conventional polyol-acrylic in the production of polyurethane coatings. The results of FTIR analysis showed that urethane, isothiocyanate, and strong C-N bonds were formed in nano-lignin-based polyurethanes. Moreover, the surface-adhesion test of the lignin-based polyurethane coating showed that by increasing the lignin content, the adhesion strength of the coating decreased. Mixing lignin nanoparticles in the polyurethane substrate caused the adhesion strength to rise from 1.67 MPa to 4.52 MPa. An increase of amino nano-lignin content up to 7% of oil based polyol improved the curing of the coating and increased the scratch resistance to more than 5 Kg. The results showed that lignin from a mechanical pulping process has a direct effect on reducing the smoothness and the glossiness in polyurethane coatings. |
| Databáze: | OpenAIRE |
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