Abstract
A kinetic study of the ultrafast curing of water-based acrylate resins upon UV irradiation was conducted by means of infrared spectroscopy. Under intense illumination, the crosslinking polymerization was found to occur in the dried film within less than one second to generate a totally insoluble polymer. The influence of a number of critical factors on the polymerization rate and cure extent has been investigated, namely the type of photoinitiator, the chemical structure of the acrylate functionalized oligomer, and the sample temperature. Coating obtained from emulsions undergo a faster and more extensive polymerization than coatings obtained from dispersions, because of a greater molecular mobility in the soft low-modulus polymer formed. Very hard coatings were produced by the UV curing of dispersion-type acrylate resins, especially when the UV irradiation was performed at 80°C on the sample emerging from the drying oven. Tg values up to 120°C were reached when such resins were UV-cured at ambient temperature as 1-mm thick plates, because of the large amount of heat released during such ultrafast polymerization. UV-cured coatings made of aliphatic polyurethane-acrylates proved to be very resistant to accelerated weathering in the presence of adequate light stabilizers.
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References
Decker, C. and Moussa, K., “Recent Advances in UV-Curing Chemistry,” Journal of Coatings Technology, 65, No. 819, 49 (1993).
Decker, C., “Photonitiated Crosslinking Polymerization,” Proc. Polym. Sci., 21, 593 (1996).
Roffey, C., Photogeneration of Reactive Species for UV Curing, Wiley and Sons, New York, 1997.
Neckers, D.C. and Jager, W., Photoinitiator for Polymerization: UV and EB at the Millennium, Wiley and Sons, New York, 1998.
Davidson, S., Exploring the Science, Technology and Applications of UV and EB Curing, SITA Techno., London, 1999.
Andrzejwska, E., “Photopolymerization Kinetics of Multifunctional Monomers,” Prog. Polym. Sci., 26, 605 (2001).
Decker, C., “Kinetic Study and New Applications of UV-Radiation Curing,” Macromol. Rapid. Commun., 23, 1067 (2002)
Decker, C., “Photopolymerization and Ultraviolet Curing of Multifunctional Monomers,” in Materials Science and Technology, Meijer, H.E.H. (Ed.), VCH Verlag, Weinheim, Vol. 18, p. 615, 1997.
Schwalm, R., Haüssling, L., Reich, W., Beck, E., Enenkel, P., Menzel, K., “Turning of the Mechanical Properties of UV-Coatings Towards Hard and Flexible Systems,” Prog. Org. Coat., 32, 191 (1997).
Arnoldus, R., “Radiation-Curable Aquous Emulsions,” Proc. RadTech Europe Conf., p. 121, 1989.
Philips M., Loutz J.M., Peeters S., Destexhe R., and Lindekens L., “Radiation-Curable Water Dilutable Polyester-Acrylates,” Proc. RadTech America Conf., p. 157, 1992.
Awad, R. and Lunger, F., “New Developments in waterborne UV-Resins for Wood Coatings,” Proc. RadTech Europe Conf., p. 415, 2001.
Reich, W., Enenkel, P., Keil, E., Lokai, M., Menzel, K., and Schrof., W., “Waterbased Radiation-Curable Systems Newest Investigation,” Proc. RadTech America Conf., p. 258, 1998.
Masson, F., Decker, C., Jaworek, T., and Schwalm, R., “UV-Radiation Curring of Waterbased Urethane-Acrylate Coatings,” Prog. Org. Coat., 39, 115 (2000).
Decker, C., Masson, F., and Schwalm, R., “High-Speed Curing of Water-based Waterborne Coatings by UV-Irradiation,” Macromol. Mater. Eng., 288, 17 (2003).
Decker, C., Masson, F., and Schwalm, R., “How to Speed up the UV-Curing of Waterbased Acrylic Coatings,” JCT Research 1, No. 2, 127 (2004).
Decker, C. and Zahouily, K., “Light-Stabilization of Polymeric Materials by Grafted UV-Cured Coatings,” J. Polym. Sci., Polym. Chem. Ed., 36, 2571 (1998).
Decker, C., Moussa, K., and Bendaikha, T., “Photodegradation of UV-Cured Coatings II. Polyurethane-Acrylate Networks,” J. Polym. Sci. Polym. Chem. Ed., 29, 739 (1991).
Decker, C. and Zahouily, K., “Photodegradation and Photooxidation of Thermoset and UV-Cured Acrylate Polymers,” Polym. Degr. Stab., 64, 293 (1999).
Decker, C., Zahouily, K., and Valet, A., “Curring and Photostabilization of Thermoset and Photoset Acrylate Polymers,” Macromol. Mater. Eng., 286 113 (2001).
Decker, C., Zahouily, K., and Valet, A., “Weathering Performance of Thermoset and Photoset Acrylate Coatings,” Journal of Coatings Technology, 74, No. 924, 87 (2002).
Decker, C. and Zahouily, K., “Photostabilization of Polymeric Materials by Photoset Acrylate Coatings,” Radiat. Phys. Chem., 63, 3 (2002).
Good, R.J., in Contact Angle, Wettability and Adhesion, Mittal, K.L. (Ed.), VSP, New York, 1992.
Decker, C., Biry, S., and Zhaouily, K., “Photostabilisation of Organic Coatings,” Polym. Degrad. and Stab, 49, 111–119 (1995).
Decker, C., “Photostabilization of Macromolecular Materials by UV-Cured Protective Coatings,” Polymer Durability, Degradation, Stabilization and Lifetime Prediction, Clough, R.L., Billingham, N.C., and Gillen, K.T., (Eds.), Advances in Chemistry Series 249, American Chemical Society, Washington D.C., p. 320–334, 1996.
Decker, C. and Biry, S., “Light Stabilisation of Polymers by Radiation-Cured Acrylic Coatings,” Prog. Org. Coat., 29, 81–87 (1996).
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Decker, C., Lorinczova, I. UV-Radiation curing of waterborne acrylate coatings. J Coat. Technol. Res. 1, 247–256 (2004). https://doi.org/10.1007/s11998-004-0027-x
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DOI: https://doi.org/10.1007/s11998-004-0027-x