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Chemisorption and physical adsorption of light stabilizers on pigment and ultrafine particles in coatings

  • Technical Articles
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Journal of Coatings Technology

Abstract

Hindered amine light stabilizers (HALS) and UV absorbers (UVA) added to pigmented coatings adsorb on certain pigment and ultrafine oxide particles. Analysis of adsorption isotherms taken in xylene solutions and spectroscopic data revealed that chemisorption is the dominant interaction mechanism between the light stabilizers and the pigment particles. In contrast, the stabilizer interactions with ultrafine oxide particles are based on van der Waals forces, i.e., physical adsorption. In thermoset coatings, the chemisorbed stabilizers remain bound to the pigment surface on cure. The physically adsorbed stabilizers desorb on cure and migrate within the coatings. The chemistries involved in chemisorption were investigated using Fourier transform infrared spectroscopy and time-of-flight secondary ion mass spectroscopy. Stabilizers containing ester linkages hydrolyze to varying degrees into carboxy-late salts and alcohols. Acetyl groups also hydrolyze. Some of the chemisorbed light stabilizers lose the ability to protect coatings from photodegradation.

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References

  1. Hawkins, W.L., Hansen, R.H., Matreyek, W., and Winslow, F.H., “The Effect of Carbon Black on Thermal Antioxidants for Polyethylene,”J. Appl. Polymer Sci., 1, 37 (1959).

    Article  CAS  Google Scholar 

  2. Uselmeier, C.W., “How Heat and Light Affect Pigmented Polypropylene,”SPE J., 26, 69 (1970).

    Google Scholar 

  3. Allen, N.S., Bullen, D.J., and McKellar, J.F., “Photo-yellowing of Phenolic Antioxidant in the Presence of Various Stabilizer/Titanium Dioxide Pigment Combinations in Polyethylene,”J. Mater. Sci., 13, 2692 (1978).

    Article  ADS  CAS  Google Scholar 

  4. Allen, N.S. and Parkinson, A., “Interaction between Colored Pigments and Hindered Piperidine/Antioxidant Combinations in the Photostabilization of Polypropylene,”Polymer Deg. Stab., 5, 189 (1983).

    Article  CAS  Google Scholar 

  5. Klemchuck, P.P., “Influence of Pigments on the Light Stability of Polymers: A Critical Review,”Polymer Photochem., 3, 1 (1983).

    Article  Google Scholar 

  6. Hu, X., Xu, H., and Zhang, Z., “Study of CaCO3 Filled Polypropylene Composite with Long Use Lifetime,”Polymer Deg. Stab., 43, 225 (1994).

    Article  CAS  Google Scholar 

  7. Haacke, G., Longordo, E., Andrawes, F.F., and Campbell, B.H., “Interactions between Light Stabilizers and Pigment Particles in Polymeric Coatings,”Prog. Org. Coat., 34, 75 (1998).

    Article  CAS  Google Scholar 

  8. Haacke, G., Brinen, J.S., and Larkin, P.J., “Depth Profiling of Acrylic/Melamine Formaldehyde Coatings,”Journal of Coatings Technology,67, No. 843, 29 (1996).

    Google Scholar 

  9. Haacke, G., Andrawes, F.F., and Campbell, B.H., “Migration of Light Stabilizers in Acrylic/Melamine Clearcoats,”Journal of Coatings Technology,68, No. 855, 57 (1996).

    CAS  Google Scholar 

  10. Makowski, M.P., private communication.

  11. Haacke, G. and Brinen, J.S., “Depth Dependence of the Glass Transition Temperature and Crosslink Density in Two-Layer Acrylic/Melamine Coatings,”Proc. 22nd FATIPEC Congress, 3, 182 (1994).

    Google Scholar 

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1937 West Main St., P.O. Box 60, Stamford, CT 06904-0060.

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Haacke, G., Longordo, E., Brinen, J.S. et al. Chemisorption and physical adsorption of light stabilizers on pigment and ultrafine particles in coatings. Journal of Coatings Technology 71, 87–94 (1999). https://doi.org/10.1007/BF02697890

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  • DOI: https://doi.org/10.1007/BF02697890

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