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Photocurable Oil-Based Thermosets Containing Modifiers from Renewable Sources for Coating Applications.
Vojtěch Jašek1, Jan Fučík2, Otakar Bartoš1
1Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology, 61200 Brno, Czech Republic.
ACS Polymers Au
|December 16, 2024
Summary
This study developed bio-based coatings from modified rapeseed oil (MRO) using reactive diluents and polarity modifiers. These sustainable coatings significantly improved paper, steel, and wood surface properties, enhancing flexibility and adhesion.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sustainable Chemistry
Background:
- Growing demand for eco-friendly coating materials derived from renewable resources.
- Need for high-performance thermosets with improved surface properties and mechanical characteristics.
- Exploration of bio-based precursors like modified rapeseed oil (MRO) for advanced material applications.
Purpose of the Study:
- To synthesize and characterize novel bio-based coating precursors and additives.
- To evaluate the performance of MRO-based thermosets on various substrates (paper, stainless steel, beech wood).
- To demonstrate improvements in coating uniformity, flexibility, adhesion, and surface energy.
Main Methods:
- Synthesis of modified rapeseed oil (MRO), methacrylated methyl 3-hydroxybutyrate (M3HBMMA), ethyl 3-hydroxybutyrate (E3HBMMA), and isosorbide monomethacrylate (MISD).
- Structural analysis using Nuclear Magnetic Resonance (NMR), Electrospray Ionization Mass Spectrometry (ESI-MS), and Fourier-Transform Infrared Spectroscopy (FTIR).
- Application and testing of coatings on paper (dip coating), stainless steel (bend test), and beech wood (cross-hatch test).
Main Results:
- M3HBMMA reduced coating deviation on paper by 87.5% and decreased cured thermoset weight by 81.4%.
- E3HBMMA-modified MRO coatings on stainless steel showed a significant increase in flexibility and adhesion, with bending angles improving from 12° to 121°.
- MISD addition to MRO coatings on beech wood enhanced adhesion, achieving a level 5 rating (best) compared to level 1 for pure MRO.
Conclusions:
- Modified rapeseed oil (MRO) serves as a viable bio-based precursor for high-performance thermosets.
- Synthesized reactive diluents (M3HBMMA, E3HBMMA) and polarity modifiers (MISD) effectively enhance coating properties.
- These nature-inspired coatings offer a sustainable alternative with superior performance on diverse substrates.
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