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Parameters influencing the spray behavior of waterborne coatings

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Journal of Coatings Technology

Abstract

The influence of liquid pressures and orifice diameters on the sprayability of non-Newtonian, waterborne latex coatings, that vary in latex particle size and thickener composition are examined in this study. It is observed that the higher the dynamic uniaxial extensional viscosities (DUEVs, ηe) of the coatings, the larger the Sauter mean diameters (SMDs) of the spray droplets and the broader the droplet size distributions. The shear viscosities at high shear rates and the parameter reflecting shear elasticity, the storage moduli, at low deformation rates do not correlate with the droplet sizes and the distributions observed. In addition to these observations, the Sauter mean diameters of spray droplets decrease with increasing spray pressures and with decreasing orifice diameters; however, with increasing pressures, pulsations in the fluid due to turbulence create areas of high and low droplet density.

The relationship of the SMD to orifice diameters using fan nozzles is defined by the relationship:\(SMD/d_h = 5.5[\sigma \eta _e ^4 /(p_A d_h ^3 \Delta P_L ^2 )]^{0.25} + 2[\sigma p_L /(p_A d_h \Delta P_L )]0.25\)

The experimental results associated with each of these parameters are discussed in the text.

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Authors and Affiliations

  1. North Dakota State University, USA

    Lin-lin Xing & J. Edward Glass

  2. Armstrong World Industries, Inc., USA

    Raymond H. Fernando

Authors
  1. Lin-lin Xing
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  2. J. Edward Glass
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  3. Raymond H. Fernando
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Additional information

Polymers and Coatings Department, Fargo, ND 58105.

Research Development Center, Lancaster, PA 17604.

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Xing, Ll., Edward Glass, J. & Fernando, R.H. Parameters influencing the spray behavior of waterborne coatings. Journal of Coatings Technology 71, 37–50 (1999). https://doi.org/10.1007/BF02697898

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