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Title Page
Contents
ABSTRACT 10
Ⅰ. Introduction 13
Ⅱ. Basic principles of UV curing 19
2.1. UV light 19
2.2. UV curing process 20
2.3. Free radical UV curing 22
2.3.1. Features of curing process 22
2.3.2. Photoinitiators 27
2.3.3. Influence of oxygen 29
2.3.4. Acrylate oligomers and monomers 31
2.3.5. Influence of monomers and oligomers on the adhesion of coatings 34
Ⅲ. UV-curable polyurethane acrylate coating resins for PVC tiles 36
3.1. Experimental 36
3.1.1. Materials 36
3.1.2. Resin preparation 36
3.1.3. Application 36
3.1.4. Viscosity 37
3.1.5. FTIR spectroscopy 38
3.1.6. Gloss measurement 38
3.1.7. Adhesion measurement 39
3.2. Results and discussions 40
3.2.1. Functional group analysis of resins 40
3.2.2. General performance of coatings 49
3.2.3. Adhesion 49
3.2.4. Gloss 50
3.3. Conclusions 51
Ⅳ. UV-curable anti-scratch coating for PVC tiles 52
4.1. Experimental 52
4.1.1. Coating agent 52
4.1.2. Preparation of resin/powder composites 52
4.1.3. UV-curable coatings 53
4.1.4. FTIR spectroscopy 53
4.1.5. Abrasion resistance test 53
4.1.6. Pencil hardness test 55
4.1.7. Thickness test 55
4.2. Results and discussions 56
4.2.1. Characterization by FTIR spectrum 56
4.2.2. Anti-scratch properties of coating films 58
4.3. Conclusions 60
Reference 61
국문요약 63
Acknowledgement 64
Table Ⅰ-1. Advantages and Disadvantages of UV curable coatings 15
Table Ⅱ-1. Parameters of influencing the adhesion of UV curable formulations 35
Table Ⅲ-1. Formulation of coating resins 37
Table Ⅲ-2. Viscosity of the coating resins 38
Table Ⅲ-3. Grade of tape test 39
Table Ⅲ-4. Functional groups of aliphatic polyurethane acrylate oligomer 41
Table Ⅲ-5. Assignments of the peaks of FTIR spectrum for PEGDA 43
Table Ⅲ-6. Assignments of the peaks of FTIR spectrum for non-glossy resin 45
Table Ⅲ-7. Assignments of the peaks of FTIR spectrum for half-glossy resin 46
Table Ⅲ-8. Assignments of the peaks of FTIR spectrum for glossy coating resin 48
Table Ⅲ-9. Adhesion and gloss of UV-cured coatings on PVC tiles 50
Table Ⅳ-1. Properties of polyurethane acrylate coating resin 52
Table Ⅳ-2. The used three kinds of powder 52
Table Ⅳ-3. Resin/powder composites 53
Table Ⅳ-4. Grade value of abrasion resistance 54
Table Ⅳ-5. Assignments of the peaks of FTIR spectrum for coating resin 57
Table Ⅳ-6. Properties of cured films (No.7 bar coating) 58
Table Ⅳ-7. Properties of cured films (No.12 bar coating) 59
Figure Ⅱ-1. UV Curing Process. 21
Figure Ⅱ-2. Photopolymerization Reactions. 22
Figure Ⅱ-3. Chain Initiated Reaction. 24
Figure Ⅱ-4. Chain Growth Reaction. 24
Figure Ⅱ-5. Radical Generation Process of Unimolecular Photoinitiators. 27
Figure Ⅱ-6. Radical Generation Process of Bimolecular Photoinitiators. 28
Figure Ⅱ-7. Effect of oxygen on the photopolymerization. 30
Figure Ⅱ-8. Synthesis of polyurethane acrylate oligomer. 33
Figure Ⅲ-1. UV curing system. 37
Figure Ⅲ-2. FTIR spectrometer. 38
Figure Ⅲ-3. Tape test method. 39
Figure Ⅲ-4. FTIR spectrum of aliphatic polyurethane acrylate oligomer. 40
Figure Ⅲ-5. FTIR spectrum of PEGDA. 42
Figure Ⅲ-6. FTIR spectrum of non-glossy coating resin. 44
Figure Ⅲ-7. FTIR spectrum of half-glossy coating resin. 44
Figure Ⅲ-8. FTIR spectrum of glossy coating resin. 47
Figure Ⅳ-1. Steel wool tester. 54
Figure Ⅳ-2. Pencil hardness tester. 55
Figure Ⅳ-3. Thickness gage. 56
Figure Ⅳ-4. FTIR spectrum of polyurethane acrylate coating resin. 56
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