Fast & Good A new UV-curable dispersion for new challenges Axel Becker, Dr. Susanne Neumann, Dr. Delphine Kimpel 1
Outline UV-curable dispersions: combining the best of two technologies Challenge: grain enhancement combined w/ fast drying New PUD Applications Technical properties Summary
UV-curable dispersions Why? L Conventional UV coatings Migration, odor & emission of monomers Labeling, safety issues Adhesion problem due to shrinkage Correlation M w h L Conventional WB coatings Poor scratch resistance & blocking Limited gloss Limited chemical resistance Need of film forming additives (VOC) No monomers or co-solvents J UV WB coatings J Good chemical resistance Less polymer shrinkage better adhesion No blocking after curing Low h @ high M w Better matting properties Good mechanical properties
UV-cured WB coatings Advantages Low h w/o monomers or solvents Spray & curtain application Easy h control Reduced flammability Reduced skin irritation Disadvantages Flash-off step prior to UV-curing Longer cure time Higher energy consumption High surface tension of water Wetting agents needed Shrinkage due to water loss Thin film applicable Excellent adhesion on difficult substrates Easy clean-up of equipment
Fast drying needed line speed (i.e. fast drying before UV) + quality one product fullfills both requirements possible? Buerkle.com 1.Beschickung 2.Schleifmaschine 3.Walzenauftragmaschine e.a.sy-coater RCL 4.Vertreiberbürstmaschine VBM.Düsentrockner-Anlage TRDUE 6.Spachtelauftragmaschine CASC 7.UV-Anlage TRUV 8.UV-Anlage TRUV 9.Schleifmaschine 10.Winkelübergabe 11.Kombiwalzmaschine e.a.sy-coater RCF 12.UV-Anlage TRUV 13.Walzenauftragmaschine e.a.sy-coater RCL 14.UV-Anlage TRUV 1.Walzenauftragmaschine e.a.sy-coater RCL 16.UV-Anlage TRUV 17.Schleifmaschine 18.Walzenauftragmaschine e.a.sy-coater RCL 19.UV-Anlage TRUV 20.Walzenauftragmaschine e.a.sy-coater RCL 21.UV-Anlage TRUV 22.Stapelung
Grain enhancement Good grain enhancement small particle size needed SB binders Anfeuerung J but drying L WB dispersions drying J but Anfeuerung L new UV-curable dispersion pcimag.com
PUD1 1 2 : main features Solid content: ~39 % Viscosity @ 23 C: 0 00 mpa.s Particle size D 0 : ~60 100 µm Appearance: slightly milky ph: ~7,8 Label-free High shelf stability @ high T (40 C) MFFT: ~0 C
Applications Spray Roller coater Curtain Hand roller (on-site application)
Small particle size, high transparency PUD1 1 2 Best transparency Can be used for stains Minwax.com 100 µm wet Draw down on black glass
PUD1 1 PUD1 2 PUD1 Water release Water release comparable to market standard Almost tack-free before UV (comparable to market standard) 0 Drying time (min) 0 µm wet Draw down on macore 2 min @ 40 C Minimized air circulation worst, 0 best
Oak veneer Beech veneer Anfeuerung Best Anfeuerung combined w/ good physical drying properties PUD1 2 1 0 100 µm wet 0 worst, best
PUD1 1 2 Chemical resistance (IOS-MAT-0066) Very good chemical resistance Coffee 3 1-2 1 Blackcurrant 3 Ethanol -- 2 Detergent Ethyl/Butyl Acetone Desinfectant Ammonia Red wine Mustard 3 3 3-4 4-100 µm wet Draw down on coil-coating 1 worst, best
Other properties 1) Cross hatch: worst, 0 best 2) CS 10, load on each arm: 1 kg Properties PUD1 1 2 Pendulum hardness (swings) 144 137 82 101 Erichsen cupping (mm) 6,1,4 6,2,9 Db* after days Q-Sun 0,2 0,6 1,0 0,3 Adhesion on PVC 1) 0 1-2 0 Abrasion resistance on PVC (mg) 2) After 00 revolutions 24,9 9,4 27,1 8, After 1000 revolutions 38,2 1, 22, 16,9 After 2000 revolutions 60,7 34,0 7,4 33,9
Start formulations High gloss clear coat, curtain application 76, parts Irgacure 00 1,0 part EFKA 370 0,8 part Foamstar A 38 0, part Rheovis PE 1330 1,2 parts Hydropalat 140 0, part DI water 18,7 parts Viscosity DIN 4 @ 23 C: 0 sec Solid content: 30 % Low gloss clear coat, spray application 7, parts Irgacure 00 1,0 part Acematt 3300 2,0 parts EFKA 370 0,8 part Foamstar A 38 0, part Rheovis PE 1330 1,2 parts Hydropalat 140 0, part DI water 18,7 parts Viscosity DIN 4 @ 23 C: 2 sec Solid content: 30 % Build-up: 1 st layer: 100 g/m 2 Drying: 2 min @ RT + 8 min @ 0 C Curing: 1 x Hg 600 mj/cm 2 Sanding: 320 grit 2 nd layer: 100 g/m 2 Drying: 2 min @ RT + 8 min @ 0 C Curing: 1 x Hg 600 mj/cm 2
Summary offers: High transparency Good compatibility w/ conventional dispersions Fast water release High chemical resistance Furniture: High Anfeuerung Low tack before UV Flooring: Good hardness / flexibility balance Very good adhesion on soft substrates (PVC, linoleum) High abrasion resistance Suitable for on-site application
Thank you for your attention! For further questions, please ask: Axel Becker: or axel.ab.becker@basf.com delphine.kimpel@basf.com