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Brandon L. Hunt Technical Team Leader

Reducing Solvent Emissions in Liquid Coatings. Brandon L. Hunt Technical Team Leader. Kansas SBEAP: Reducing Solvent Emissions Seminar Wichita, KS March 10, 2009. Why is Solvent in Coatings?. Solubility Reduces viscosity Ease of application Atomization Potlife Film formation

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Brandon L. Hunt Technical Team Leader

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  1. Reducing Solvent Emissions in Liquid Coatings Brandon L. HuntTechnical Team Leader Kansas SBEAP: Reducing Solvent Emissions Seminar Wichita, KS March 10, 2009

  2. Why is Solvent in Coatings? • Solubility • Reduces viscosity • Ease of application • Atomization • Potlife • Film formation • Dry time • Sag resistance • Flow/Level

  3. Avenues to Reducing Emissions • Low VOC/HAP Technology • Application Technology • Formulation/Process Techniques • Future Trends

  4. Low VOC/HAP Technology • Waterborne • Comparable durability • Ability for very low VOC • Proper solvents can make HAP-free • Temperature and humidity dependent • Must not be allowed to freeze

  5. Low VOC/HAP Technology • High Solids • Low VOC/HAP levels • Up to 100% solids • Aesthetic limitations to higher solids • Exempt Solvents/Solvent Substitution • Exempt solvents count as VOC in other countries • Exempt reducer can reduce emissions but does not alter the compliance VOC • Few solvents are exempt; limited solubility • Substitute solvents can achieve HAP compliance without significantly changing coating

  6. Low VOC/HAP Technology • Energy Cure (UV/EB) • Part size limitations • Curing equipment investment • Zero VOC

  7. Application Technology • Transfer Efficiency • Electrostatic, HVLP • VOC reduction • Gas carrier

  8. Formulation/Process Techniques • Eliminate Layers • DTM Technology • Eliminate pretreatment or primer • Lower Dry Film Thickness • Topcoat pigmentation • Improved hiding power of pigments • Higher performance resins • Solvent replacement • Extender pigments • Reactive diluents/additives

  9. Future Trends • Eliminate Layers • Self-Stratifying Technology • Eliminate pretreatment or primer • Hybrid Technology • Powder/EB Cure

  10. Other Green Technology • Eliminate Cr (VI) • Chrome Hazard Free Technology • Pretreatments • Primers • Surfacers

  11. Sherwin-Williams Initiatives EcoVision is our company-wide commitment to look for and implement ways that reduce our impact on the environment. It's a shared and ongoing vision that all Sherwin-Williams employees can help achieve. We believe the optimal green coating should do two things: minimize the impact on air quality and deliver maximum performance. So we've developed the GreenSure symbol to help you identify the products that meet our highest green coating standards. www.sherwin-williams.com/pro/green/

  12. Websites for further information: • www.sherwin-williams.com • www.swaerospace.com

  13. Thank you!! Acknowledgements: Kenneth Gabele Manager, Sherwin-Williams Regulatory Information Services Heidi Perez-Hernandez Chemist, Sherwin-Williams Aerospace Coatings

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