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1、TECHNICALBACKGROUND/SLIP,FLOWANDRADIATION-CURINGADDITIVES60SlipandFlowAdditivesRadiation-curingAdditivesTEGO®GlideTEGO®FlowTEGO®RadTECHNICALBACKGROUND/SLIP,FLOWANDRADIATION-CURINGADDITIVES61Thecustomer’swish:theperfectfinishDemandsonpaintsandcoatingsarehig
2、hbutmaydiffersignificantlyinde-tail.Themostcommonrequirementsarebrilliant,smoothand,mostimportantly,defect-freecoatings.Insomeareasofapplicationconsiderableemphasisisplacedonasmoothsurfacewhichisalsoeasytorepair.Acoatinghastwointerfaces,onewiththesubstrate
3、andanotherwiththesur-roundingair.Additivesareactiveattheseinterfaceswheretheyareeffec-Figure1:Optimalflowtiveagainstprocesseswhichleadtoimperfectionsinthecoating.Thusslipperfectionswhicharisefromspraymist,Bénardcells:differencesinsurfaceandflowadditivessig
4、nificantlyreducebrushstrokes,etc.(DIN55945).Thetensionthesusceptibilitytodefects,resultinginlevelingofacoatingmaterialisstronglyToachievegoodflow,thesurfaceten-acoatingwhichappearsfreeofflawsdependentonitsflowproperties,sur-sionmustremainuniformoverthecom-
5、andhasamarkedlyimprovedscratchfacetension,applicationparameterspletesurfaceofthecoatinglayerwhileresistance,especiallywithfreshlyap-anddryingconditions.Iftheflowisitisdrying.Duringthedryingofasol-pliedcoatings.Thecoatingisandinadequate,surfacedefectssuchas
6、ventbornecoatingfilm,thesolventonremainsattractive.obvioustexture,hollowsandcratersinthesurfaceevaporatescausingdiffer-thecoatingsurfaceoccur.Incontrast,encesintemperature,surfacetension,Eliminatingunevenness:flowcoatingswithgoodflow–whenappliedsolventconc
7、entrationanddensityorlevelingonasuitablesubstrate–producewithinthefilm.Tobalancethethermo-Theterm“leveling”indicatestheintrin-smoothsurfacesofexceptionalopticaldynamicdisequilibriumcurrentsoccursicpropertyofcoatingstoevenoutim-brilliance.inthecoatingfilm.T
8、hesecurrentspro-duceeddiesinthedryinglayer,aphe-nomenonknownastheformationofBénardcells.Thesurfacetensionishigherattheedgesofthecellsthanattheircentersandcoatingmaterialflowslowsurfacetensionhighsurfacetensio
