bayer光固化UV.ppt

J. Weikard, W. Fischer, E. Lühmann, D. Rappen, “UV cured and elastomeric coatings - a contradiction?”, e5-conference proceedings, Charlotte, USA, 2004 UV cured and elastomeric coatings - a contradiction? Study on linear urethane acrylates: What level of elongation at  break is possible? Parameters that influence tensile strength, viscosity,  UV-reactivity,...? What are the application options? Result: Desmolux XP 2491 Polycarbonate Polyester/-carbonate Polyester #2 Polyester #1 elongation at break [%] tensile strength [N/mm2] Stress/strain of UV cured linear urethane acrylates in dependence of soft segment diols Aliphatic urethane acrylates for flexible applications admixtures in flexibilizing UV-curing formulations improve elasticity, e.g.for films and coils  improvement of polishing properties temporary coatings  peel-off films,  transportation coatings, etc.  soft-feel or soft-touch coatings  UV-soft formulation according to OEM specifications: Solvent resistance: very good Suntan lotion resistance: sufficient Haptic: sufficient Application options for elastomeric urethane acrylates UV softtouch coating for plastic substrate Formulation pbw % bw Grinding by dissolver Desmolux XP 2513 40.00 17.67 Desmolux XP 2491 60.00 26.52 Acematt 3200 (1) 6.50 2.87 Acematt 3300 (1) 6.50 2.87 2-(2-Ethoxyethoxy)ethylacrylat(EOEOEA) (2) 33.00 14.58 Butyl acetate 75.00 33.14 Darocur 1173 (3) 5.32 2.35 226.32 100.00 Technical data Viscosity 23 °C 910 mPa×s; D 40 1/s Application and curing conditions Adjust viscosity with butyl acetate for application method (roller, blade or spray). Dry film thickness approx. 40 μm Flash off: e.g. laboratory convection oven 5 min, 60 °C 1 UV lamp (mercury 80 W / cm) approx. 5 m / min (1) ; (2) .tw; (3) PC-substrate for CD/DVD production Formulation guideline for DVD-bonder Product Desmolux VP LS 2308 HDDA TCDDMDA*