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Formulating High Performance Coatings with Novel Adhesion Test Methods

Formulating High Performance Coatings with Novel Adhesion Test Methods

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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?