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Air convective drying and curing of polyurethane-based paints on sheet molding compound surfaces

  • Technical Focus Article
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Journal of Coatings Technology

Abstract

In this study the kinetics and phase changes which occurred during the convective drying of a model car paint based on the polyurethane chemistry is described. The competition between the kinetics of the solvent removal and the phase changes, such as the gelation and/or the vitrification of the polyurethane, needs to be taken into account to avoid the defects in the resulting dried coating. The kinetics of polycondensation of a two-component polyurethane based on polyester triol and triisocyanate in a mixture of various solvents was studied as a 100 µm thick layer on sheet molding compound (SMC) and zinc plated steel plates. Differential scanning calorimetry (DSC) and Fourier-Transform infrared spectrometry (FTIR) and thermogravimetric analysis (TGA) during isothermal curings allowed us to determine the rate constants and the activation energies by using second and third order autocatalytic models.

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Authors and Affiliations

  1. UMR CNRS 5627, Institut National des Sciences Appliquées de Lyon, Bât. 403, 69621, Villeurbanne Cedex, France

    J. Galy & J. F. Gérard

  2. Laboratoire d’Automatique et de Génie des Procédés, France

    S. Vessot, J. Andrieu & P. Laurent

  3. Laboratoire de Matériaux Macromoléculaires, France

    J. Galy & J. F. Gérard

Authors
  1. S. Vessot
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  2. J. Andrieu
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  3. P. Laurent
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  4. J. Galy
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  5. J. F. Gérard
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Additional information

UPRES-A CNRS Q-5007, CPE Lyon, Bât. G308, Campus de la Doua, 69622 Villeurbanne Cedex, France

UMR CNRS 5627, Institut National des Sciences Appliquées de Lyon, Bât. 403, 69621 Villeurbanne Cedex, France

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Vessot, S., Andrieu, J., Laurent, P. et al. Air convective drying and curing of polyurethane-based paints on sheet molding compound surfaces. Journal of Coatings Technology 70, 67–76 (1998). https://doi.org/10.1007/BF02720517

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  • DOI: https://doi.org/10.1007/BF02720517

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