A REVIEW OF POLYURETHANES: FORMULATION VARIABLES AND THEIR EFFECTS ON PERFORMANCE

If epoxy primers are the workhorses of corrosion-resistant primers, then aliphatic polyurethanes are the workhorses of topcoats. Other polyurethanes called aromatics also have many uses in heavy-duty maintenance painting, particularly as primers and undercoats. While failures of polyurethanes are often attributed to errors in surface preparation, application, or specification, some failures can be the result of formulation and the interreactivities in the liquid coating itself. This article reviews formulation variables in polyurethane-based systems and how these variables affect performance. It focuses on polyurethane systems that utilize the reactions of diisocyanates and polyisocyanates with water and other hydrogen donors for their cure and film-forming mechanisms. The article begins with an overview of the curing mechanisms of polyurethanes. It describes the impact of catalysts, solvents, moisture, pigments, and other coating components on the performance of conventional, solvent-borne two-component and moisture-curing polyurethanes. It discusses challenges created by the need to reduce volatile organic compound levels and approaches to meeting these challenges, including efforts to develop water-borne polyurethanes tough enough for heavy-duty maintenance painting.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/87551985
• Corporate Authors:

  Technology Publishing Company

  2100 Wharton Street, Suite 310
  Pittsburgh, PA  United States  15203
• Authors:
  • Hare, Clive H
• Publication Date: 2000-11

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 34-44
• Serial:
  • Journal of Protective Coatings & Linings
  • Volume: 17
  • Issue Number: 11
  • Publisher: Steel Structures Painting Council
  • ISSN: 8755-1985

Subject/Index Terms

• TRT Terms: Catalysis; Catalysts; Coatings; Curing agents; Films (Coatings); Formulations; Moisture content; Organic compounds; Paint; Performance; Pigments; Polyurethane resins; Solvents
• Uncontrolled Terms: Diisocyanates; Polyisocyanates
• Subject Areas: Geotechnology; Highways; Materials; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00805638
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 19 2001 12:00AM