High-biobased-content UV-curable oligomers derived from tung oil and citric acid: Microwave-assisted synthesis and properties
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Ultraviolet (UV)-curing technique has been widely applied in modern industrial areas such as coatings, inks, and adhesives due to their “5E” advantages, i.e. efficient, energy saving, enabling, economical, and eco-friendly. However, due to the dramatic fluctuation of oil prices, greenhouse effect from CO2 emission, and serious environmental problems, much efforts have been devoted into the preparation of UV-curable materials from renewable resources such as carbohydrates, plant oils, and rosins.<br /> In this study, two novel UV-curable oligomers (TMCG1 and TMCG2) from tung oil and citric acid were synthesized via microwave technology and confirmed by FT-IR,1H NMR, and 13C NMR. The total reaction time was only 30 min, and the obtained oligomers showed high biobased contents (over 60%). Furthermore, a series of UV-curable coatings were constructed by copolymerizing the oligomers with a biobased reactive diluent (GA) from guaiacol. The resulting UV-cured materials achieved both high biobased content and high performance. For instance, the cured TMCG1 film with 10% of GA showed a biobased content of 72.4%, tensile strength of 16.6 MPa, glass transition temperature of 74.1 oC, maximum thermal degradation temperature of 437.2 oC, adhesion of 2 grade, pencil harness of 2H, and flexibility of 2 mm.<br /> In general, the biobased UV-curable coatings show great potential to be applied in the fields of coatings like wood coatings, and the combination of bioresources, microwave technology, and UV-curing technology indicated in this work could provide a “green + green + green” solution for the coating industry.
Keywords: Agriculture, Economic Development, Education, Research, Innovation
ID: 3483375