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Biobased reactive diluent for UV-curable urethane acrylate oligomers for wood coating

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Abstract

Castor oil (CO)-based reactive diluent for UV-curable urethane acrylate oligomers was synthesized by the reaction of a CO with diethanolamine and the resultant product was subsequently reacted with allyl chloroformate. The reactive diluent was characterized by FTIR and 1H NMR techniques. This reactive diluent was incorporated in a urethane acrylate oligomer and photoinitiator at different weight fractions varying from 5 to 25 wt% for UV curing. The effects of reactive diluent concentrations on the viscosity of the formulations along with mechanical, chemical, and optical properties of UV-curable coatings were studied. Furthermore, the cured films were evaluated for glass transition temperature (T g) determined by differential scanning calorimetry and thermal stability by thermogravimetric analysis. Gel content and water absorption of UV-cured films were evaluated.

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Acknowledgments

We wish to thank UGC Green Tech. for providing financial support and Mr. Sunil S. Daddikar (Director, Unique UV & Light PVT. Ltd., Vasai.) for providing the UV curing facility.

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Authors and Affiliations

  1. Department of Polymer and Surface Engineering, Institute of Chemical Technology, Mumbai, India

    Dipak S. Tathe & R. N. Jagtap

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  1. Dipak S. Tathe
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  2. R. N. Jagtap
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Correspondence to R. N. Jagtap.

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Tathe, D.S., Jagtap, R.N. Biobased reactive diluent for UV-curable urethane acrylate oligomers for wood coating. J Coat Technol Res 12, 187–196 (2015). https://doi.org/10.1007/s11998-014-9616-5

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