UV-curable Powder Coatings

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Table of contents

1 INTRODUCTION 
2 AIM OF THIS WORK 
3 THEORY
3.1 AN INTRODUCTION TO POWDER COATINGS
3.2 HOW POWDER COATINGS WORKS
3.2.1 UV-CURING
3.2.1.1 UV- curing in general
3.2.1.2 UV-curable Powder Coatings
3.3 FILM FORMATION
3.3.1 WETTING/SPREADING OF POWDER PARTICLES ON A SUBSTRATE
3.3.2 COALESCENCE
3.3.3 FILM FLOW AND LEVELLING OF COATINGS
3.4 OPTIMISING FILM FORMATION
3.4.1 PARAMETERS INFLUENCING POWDER COATING PROPERTIES
3.5 SUBSTRATE SURFACE
3.6 CALCULATIONS OF POWDER PARTICLE SPREADING
3.7 SURFACE ENERGIES, LEWIS ACID-BASE AND LIFSHITZ-VAN DER WAALS FORCES
3.7.1 THE SUBSTRATE SURFACE
3.7.2 SURFACE TENSIONS OF A POWDER COATING MELT
4 EXPERIMENTAL 
4.1 MATERIALS
4.2 METHODS
4.2.1 MOLECULAR WEIGHT AND DISTRIBUTION
4.2.2 MELTING POINT
4.2.3 PREPARATION OF SUBSTRATE SURFACES
4.2.4 CONTACT ANGLE MEASUREMENTS
4.2.5 POWDER PARTICLE SPREADING
4.2.5.1 Microscope Set-up
4.2.5.2 Heating of the Powder on the Substrates
4.2.6 EVALUATION OF SURFACE ENERGY AND FORCE CHARACTERISTICS
5 RESULTS AND DISCUSSION 
5.1 MOLECULAR WEIGHT AND MOLECULAR WEIGHT DISTRIBUTION
5.2 MELTING POINT
5.3 PREPARATION OF SUBSTRATE SURFACES
5.4 CONTACT ANGLE MEASUREMENTS
5.5 POWDER PARTICLE SPREADING
5.6 EVALUATION OF SURFACE ENERGIES, LEWIS ACID-BASE AND LIFSHITZ-VAN DER WAALS FORCES
5.6.1 SUBSTRATES
5.6.2 POWDER MELT
6 CONCLUSIONS 
7 FURTHER WORK/PROPOSAL FOR FURTHER WORK 
8 ACKNOWLEDGEMENTS 
9 REFERENCES 
APPENDIX I
APPENDIX II