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2013|14 Annual Report Fraunhofer IGB

101 Dr. Jakob Barz Phone +49 711 970-4114 jakob.barz@igb.fraunhofer.de Dr. Michael Haupt Phone +49 711 970-4028 michael.haupt@igb.fraunhofer.de Verification of the degradation characteristics just hours later In studies carried out by the Fraunhofer IGB for Bayer Material Science, polyurethane paint samples were weathered in vari- ous plasma atmospheres. Fig. 2 shows the results obtained using water vapor plasmas, compared with two standard weathering processes. Weathering with the addition of gas- eous water produces degradation to the surface after only 60 minutes, whereas with classical artificial weathering ac- cording to SAE J2527 degradation characteristics become evident only after more than 1000 hours. This shows that artificial and plasma weathering result in a comparable degra- dation pattern, here reflected in the measurements for surface roughness and gloss. Outlook The results to date show, that plasma weathering has the potential to substantially shorten production development cycles. We are therefore currently investigating the specific ef- fects of individual process parameters on the aging behavior of polyurethane and other polymers, to further optimize the plasma weathering process and to verify equivalence with rec- ognized artificial and natural outdoor weathering procedures. Patents have already been filed for various technical solutions. 1 Particles in a plasma. The particle streams shown always refer to 1 nm2 of the surface. 2 Comparison of various plasma and standard weathering processes for polyurethane paint. The bars show the results from the standard testing methods according to SAE J 2527 and DIN EN ISO 11341 as well as with a water vapor plasma. The measurements shown are the relative gloss and the surface roughness (sdr). 3 Paint surface before and after plasma weathering. Project partner Bayer Material Science, Leverkusen 2 3 Contacts 0 0 rel.gloss surfaceroughnesssdr[%] 1aa 1ab 1at4aa 4ab 4at water vaporDIN EN ISO 11341SAEJ 2527 120 6 100 5 80 4 60 3 40 2 20 1 rel. gloss 20° sdr (%) 40 μm sdr (%) 10 μm sdr (%) 5 μm sdr (%) 1 μm

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