Development of wood protective polyurethane coatings from mahua oil-based polyetheramide polyol: a renewable approach

ABSTRACT

The present work reports the preparation of wood protective polyurethane (PU) from mahua oil-based polyetheramide polyol and its performance evaluation. The synthesis of polyetheramide polyol was carried out in two steps: the first step deals with the synthesis of mahua oil fatty amide (MFA) from mahua oil by base catalyzed aminolysis reaction and the second step deals with the synthesis of polyetheramide polyol from diglycidyl ether of bisphenol-A (DGEBA) and MFA. The structure of the synthesized polyetheramide polyol was confirmed by the Attenuated total reflection fourier transform infrared (ATR-FTIR) and proton nuclear magnetic resonance (¹H NMR) spectroscopy. The synthesized polyetheramide polyol was used as a precursor for the wood protective PU coatings. The performance of the prepared wood protective PU coatings was evaluated by the measurements of the various performance properties. The results reveal that mechanical, thermal, and microbial properties of the prepared PUs are satisfactory compared to other literature reported vegetable oil-based PUs; whereas, water, solvent, and chemical resistance of the prepared PUs are quite good. The study concludes that mahua oil-based polyetheramide polyol is a suitable precursor for the preparation of wood protective PU.

KEYWORDS:

• Coating
• polyetheramide polyol
• polyurethane
• renewable
• vegetable oil

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Acknowledgments

The authors express their gratitude to S. V. National Institute of Technology for providing the necessary research facilities. The authors acknowledge Department of Surface Coating Technology, Institute of Science and Technology for Advanced Studies and Research (ISTAR), Vallabh Vidyanagar, India; Center of Excellence in Drug Discovery, Saurashtra University, Rajkot, India; Sophisticated Instrumentation Centre for Applied Research and Testing (SICART), Vallabh Vidyanagar, India; Material Research Centre (MRC), MNIT, Jaipur, India; Dr. Vimal S. Prajapati, Aspee Shakilam Agri Biotechnology Institute, Surat, India for providing analytical facilities. The authors thank Atul Ltd, Valsad, India for providing the necessary samples for the research.