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Formulating High Performance Coatings with Novel Adhesion Test Methods

Formulating High Performance Coatings with Novel Adhesion Test Methods. Dr. Yutao Yang NW Coatings Fest 2014 October 9th, 2014 Hood River, Oregon. Outlines. Introduction - Molecular Adhesion - Adhesion Mechanisms - Adhesion Test Methods Results & Discussion

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Formulating High Performance Coatings with Novel Adhesion Test Methods

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  1. Formulating High Performance Coatings with Novel Adhesion Test Methods Dr. Yutao YangNW Coatings Fest 2014 October 9th, 2014 Hood River, Oregon

  2. Outlines Introduction - Molecular Adhesion - Adhesion Mechanisms - Adhesion Test Methods Results & Discussion - Case Study 1: Contact angle and surface free energy - Case Study 2: Effect of coalescent solvents - Case Study 3: Effect of particle size and special monomer - Case Study 4: Effect of elasticity - Case Study 5: Polymer composition effect - Case Study 6: Adhesion between a top coat and primers on paper Summary

  3. Introduction: Cohesion 1 1 1 Work of Cohesion: W = 2 γ1 Bulk properties: Cohesion=> Density Hardness Melting point

  4. Introduction: Adhesion 1 1 2 2 Work of Adhesion W= γ1 + γ2 - γ12 Interfacial behavior: Adhesion => Adsorption Corrosion Friction Wear

  5. Introduction: MolecularAdhesion Van der Waals Forces

  6. Introduction: Adhesion Mechanisms Molecular Adhesion Contamination Brownian motion Roughness effect Cracking mechanism Elastic deformation Non-elastic deformation Plasticity of surfaces Non-equilibrium adhesion Chemical Bonding Covalent (C-O, C-N) Ionic (M-X) Hydrogen (X-H…Y) Acid-base Interaction

  7. Evolution of Adhesion Test Methodology Introduction: Test Method Development References: [1] Dickinson, Materials Today, 12, 2009, 46. [2] Dhinojwala, Rev. of Scien. Instru. 73, 2002, 2321.

  8. Results & Discussion Case Study 1 Contact angle and surface free energy for floor panels

  9. Results & Discussion Case Study 2 Effect of coalescent solvents on adhesion *Coalescent Solvent key: DPM = Dipropylene Glycol Methyl Ether TPM = Tripropylene Glycol Methyl Ether

  10. Results & Discussion Case Study 3 Effect of particle size and special monomer on adhesion performance

  11. Results & Discussion Case Study 3 Effect of particle size and special monomer on adhesion performance & Comparison of adhesion test methods

  12. Results & Discussion Case Study 4 Effect of elasticity on adhesion for PUD coatings: strong positive correlation

  13. Results & Discussion Case Study 5 Polymer composition effect on paint adhesion performance

  14. Results & Discussion Case Study 5 Polymer composition effect on paint adhesion performance Adhesion performance is measured and differentiated with the novel method!

  15. Results & Discussion Case Study 6 Adhesion between a top coat and primers on paper substrate Top coat ~ 25 μm Primer ~ 25 μm Substrate ~ 100 μm Crosshatch cut test is hard to apply!

  16. Results & Discussion Case Study 6 Adhesion between a top coat and primers on paper substrate Adhesion performance is measured and differentiated with the novel method!

  17. Summary Newly developed adhesion test methods have been applied to coating systems: - Surface free energy of substrates - Surface tension of coating liquids - Adhesion energy of dry coating films on substrates - Elastic modulus of dry coating films on substrates - Adhesion forces between top coats and primers Newly developed adhesion test methods demonstrate higher resolution and precision than conventional ASTM methods: - Enhance the understanding of polymer structure effects on adhesion - Improve the formulations by detecting the composition effects - Accelerate the development of polymers and coating formulations

  18. Acknowledgements The Lubrizol Corporation Larry Schnieders Lee Young Mary Solomon Thank you! Questions?

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