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Polyurea Technology Overview

Polyurea Technology Overview. Presented by: John Durig 1 st Annual TRFA Meeting November 10, 2003. Polyurea Overview. History Chemistry Equipment for spraying Surface prep and priming Comparison of epoxy, urethane elastomers and polyurea. Polyurea Overview. Advantages of polyurea systems

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Polyurea Technology Overview

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  1. Polyurea Technology Overview Presented by:John Durig1st Annual TRFA MeetingNovember 10, 2003

  2. Polyurea Overview • History • Chemistry • Equipment for spraying • Surface prep and priming • Comparison of epoxy, urethane elastomers and polyurea

  3. Polyurea Overview • Advantages of polyurea systems • Applications • Case histories • Challenges for raw material suppliers • Summary

  4. Polyurea History • 1981 – developed for automotive RIM parts • 1987 – polyurea spray technology introduced by Texaco • 1988 – first commercial usage as an in-field coating • 1993 – several formulators enter market

  5. Basic Chemistry • Amine + Aromatic Isocyanate yields Aromatic Polyurea • Amine + Aliphatic Isocyanate yields Aliphatic Isocyanate • No metal catalysts required

  6. Basic Chemistry MIX RATIO IS CRITICAL!

  7. Application Equipment • Plural component • High pressure (1,500 – 3,000 psi) • High temperature (140 – 170°F) • Impingement systems • 1:1 mix ratio

  8. Equipment Manufacturers • Gusmer • Graco • Glass Craft • Spray Tech • AST

  9. Surface Preparation • Concrete: follow manufacturer’s recommendations: SHOTBLAST • Steel: Minimum SP 10/NACE 2 with a 3 mil profile for immersion service

  10. Priming • Concrete: should be primed and sealed to reduce outgassing • Carbon Steel: does not require primer • Stainless Steel, Galvanized Steel, Aluminum and other Substrates: - See manufacturer

  11. Comparison of Epoxy, Polyurethane Elastomers and Polyurea

  12. Comparison of Epoxy, Polyurethane Elastomers and Polyurea, cont.

  13. Advantages of Polyurea • Fast cure: little down time • No solvents, VOCs and low odor • Application at -20°F to 350°F • 1:1 mix ratio preferred • Excellent physical properties

  14. Advantages of Polyurea, cont. • High abrasion resistance • Flexible and tough • No low temperature embrittlement(-40°F) • Excellent adhesion (1,500 – 2,000+ psi carbon steel) • Repairs quickly at low temp – brush grade • Single high build systems

  15. Limitations & Precautions • Color stability of aromatic systems • Evaluate concrete moisture levels • Surface preparation requirements • Chemical resistance should always be verified

  16. Polyurea Applications

  17. Polyurea Applications

  18. Gold Bar WWTP Sedimentation TankInstaller: Desco Coatings of Alberta

  19. The Warehouse Club Parking RampInstaller: Spectrum Contracting Corp, Grafton, WI

  20. Motorola Emergency Water Storage TankInstaller: Mobile Enterprises, Fort Worth, TX

  21. Challenges for Raw Material Suppliers • Polyurea technology will take market share from traditional urethanes and epoxies • Market needs • Improved chemical resistance • Solvents • Strong acids • Oxidizing agents

  22. Challenges for Raw Material Suppliers • Market needs, cont. • Slower systems • Reduces overspray issues • Improves film appearance • Improves substrate wetting • Reduces film build requirements • Improve color stability

  23. Summary Polyurea formulation and application technology have vastly improved over the last 10 years. Growth of this technology will be at the expense of traditional resin systems. This will occur because of the benefit of rapid return to service in combination with performance benefits including low perm rating, outstanding adhesion and toughness.

  24. Summary, cont. The use of polyurea technology could be dramatically increased if the limitations created by fast cure and limited chemical resistance are overcome by formulators and raw material suppliers. Successful application requires attention to appropriate surface preparation, priming and maintaining proportioning equipment.

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