Skip to main content

Effect of particle size distribution on the performance of two-component water-reducible acrylic polyurethane coatings using tertiary polyisocyanate crosslinkers

Abstract

A two-component waterborne polyurethane system with a 250 g/l VOC has been formulated to meet the performance requirements of the automotive refinish market.

This paper discusses an experimental study to develop a two-component water-reducible polyurethane coating using a tertiary aliphatic polyisocyanate crosslinker with dry times, appearance, and reactivity equivalent to a two-component solventborne system. The effects of acrylic polyol monomer composition, glass transition temperature (Tg), and hydroxyl concentration on drytime and ambient cure film performance have been determined. The effects of particle size distribution of the formulated coating on performance were examined. It was found that smaller particle size provides overall improved film properties, i.e., faster dry time, increased hardness, and faster development of solvent resistance. The relationships of both acrylic polyol composition and formulation variables on the particle size distribution are discussed.

This is a preview of subscription content, access via your institution.

References

  1. Bittner, A. and Ziegler, P., “Water-Borne Two-Pack Polyurethane Coatings for Industrial Applications,”Proc. Third Nurnberg Congress, Paper 38, 1995.

  2. Kahl, L. and Bock, M., “Waterborne 2-Component PU Clear Coats for Automotive Coatings: Development of Raw Materials and Mixing Technology,”Proc. Third Nurnberg Congress, Paper 7, 1995.

  3. Jacobs, P.B. and Yu, P.C., “Two-Component Waterborne Polyurethane Coatings,”Journal of Coatings Technology, 65, No. 822, 45 (1993).

    CAS  Google Scholar 

  4. O’Connor, J.M., Chen, A.T., Blackwell, R.S., and Morgan, M.J., “Two-Component Waterborne Polyurethane Coatings Based on Low Viscosity Hydrophobic Polyisocyanates,”Proc. 24th Waterborne, High Solids and Powder Coatings Symp., New Orelans, LA, 458–468, 1997.

  5. Renk, C.A. and Swartz, A.J., “Fast Drying, Ultra Low VOC, Two-Component Waterborne Polyurethane Coatings for the Wood Industry,”Proc. 22nd Waterborne, High Solids and Powder Coatings Symp., New Orleans, LA, 266–276, 1995.

  6. Dvorchak, M.J., “Using High Performance Two-Component Waterborne Polyurethane Wood Coatings,”Journal of Coatings Technology, 69, No. 866, 47 (1997).

    Article  CAS  Google Scholar 

  7. Bui, H., Dvorchak, M.J., Hudson, K., and Hunter, J., “The Rheology of Mixing in Two-Component Waterborne Polyurethane Coatings,”Proc. 24th Waterborne, High Solids and Powder Coatings Symp., New Orleans, LA, 515–528, 1997.

  8. Buckley, W.O. and Groenveld, M.K., “Crosslinker Blends in Two-Component Waterborne Polyurethanes,”Proc. Fourth Nurnberg Congress, Paper 30, 1997.

  9. Fiori, D.E., “Two-Component Water Reducible Polyurethane Coatings,”Prog. Org. Coat., 32, 65–71 (1997).

    Article  CAS  Google Scholar 

  10. Fiori, D.E. and Quinn, R.J. (to Cytec Industries Inc.), U.S. Patent 5,466,745 (Nov. 14, 1995).

  11. Fiori, D.E. and Dexter, R., “m-TMXDI/TMP Adduct: A New Alphatic Isocyanate Crosslinking Agent for the Coatings Industry,”Proc. 13th Waterborne, High Solids and Powder Coatings Symp., New Orelans, LA, 186, 1986.

  12. Dvorchak, M.J. and Bui, H., “Mixing Study in Two-Component Waterborne Polyurethane Coatings with Hydrophobic and Hydrophilic Polyisocyanates,”Proc. 25th Waterborne, High Solids and Powder Coatings Symp., New Orleans, LA, 80–92, 1998.

  13. Ley, D.A., Fiori, D.E., and Quinn, R.J., “Optimization of Acrylic Polyols for Low VOC Two-Component Water Reducible Polyurethane Coatings Using Tertiary Isocyanate Crosslinkers,” (Publication pending)Proc. 24th Annual International Conf. in Organic Coatings, Athens, Greece, 1998.

  14. Hegedus, C.A., Gilicinski, A.G., and Haney, R.J., “Film Formation Mechanism of Two-Component Waterborne Polyurethane Coatings,”Journal of Coatings Technology, 68, No. 852, 51 (1996).

    CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

1937 West Main Street, Stamford, CT 06904.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Fiori, D.E., Ley, D.A. & Quinn, R.J. Effect of particle size distribution on the performance of two-component water-reducible acrylic polyurethane coatings using tertiary polyisocyanate crosslinkers. Journal of Coatings Technology 72, 63–69 (2000). https://doi.org/10.1007/BF02698006

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02698006

Keywords

  • Polyol
  • Median Particle Size
  • Solvent Resistance
  • Polyurethane Coating
  • Waterborne Polyurethane