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Processing and properties of spray-applied, 100% solids polyurethane coatings from rapeseed oil polyols

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Abstract

Rigid polyurethane (PU) coatings were obtained from rapeseed oil (RO), triethanolamine (TEA), diethanolamine, and glycerol polyols. The dynamic mechanical analysis of PU coatings showed that the β-transition process occurs at −60°C for these PU networks. At 20°C, the tensile storage modulus (E′) is higher for those PU networks that are characterized with higher cohesive energy density (CED). There is a good correlation between the theoretical molecular weights between two crosslinking points (M c) of the PU network and M c that has been calculated from E′ based on the ideal rubber theory. PU coatings from a RO/TEA polyol and polymeric 4,4′-methylene diphenyldiisocyanate (MDI) were sprayed using a Graco Reactor E-10 industrial spraying machine with a volume ratio of the components A:B = 1.0:1.0. Eco-friendly volatile organic compounds-free, 100% solids, fast-curing two pack (2 K) PU coating compositions were formulated. The kinetics of gel formation was studied for PU coatings from RO/TEA, chain extenders, and polymeric MDI under adiabatic conditions; the temperature range was from 10 to 50°C. It was found that gel formation occurs with activation energy (E a) 26.56–33.43 kJ/mol. When a PU coating is spray-applied on a substrate under nonadiabatic conditions, the gel formation time of the coating is not significantly influenced by the temperature of the components in the range 20–50°C.

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Acknowledgments

The work was financed by the European Regional Development Fund Contract No. 2010/0214/2DP/2.1.1.1.0/10/APIA/VIAA/054.

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Authors and Affiliations

  1. Polymer Laboratory, Latvian State Institute of Wood Chemistry, Dzerbenes 27, Riga, 1006, Latvia

    U. Stirna, A. Fridrihsone-Girone, V. Yakushin & D. Vilsone

  2. Institute of Environment and Energy Systems, Riga Technical University, Kalku 1, Riga, 1658, Latvia

    A. Fridrihsone-Girone

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  1. U. Stirna
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  2. A. Fridrihsone-Girone
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  3. V. Yakushin
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  4. D. Vilsone
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Correspondence to A. Fridrihsone-Girone.

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Stirna, U., Fridrihsone-Girone, A., Yakushin, V. et al. Processing and properties of spray-applied, 100% solids polyurethane coatings from rapeseed oil polyols. J Coat Technol Res 11, 409–420 (2014). https://doi.org/10.1007/s11998-013-9545-8

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  • DOI: https://doi.org/10.1007/s11998-013-9545-8

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