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1、漆膜附著機理的探討1adhesiontypeandadhesionofpaintfilmonsubstrateTheadhesionofthefilmonthesubstrateisdividedinto2types:mechanicalattachmentandchemicalattachment?Mechanicalattachmentisdependentonpropertiesofcoatingplate(theroughness,porosity)andtheformationofthefil
2、mstrength;chemicalattachmentreferstothemutualattractionofpaintfilmandplateinterfacefilmsheetmoleculesandmolecules,onthephysicochemicalpropertiesofpaintfilmandplateonit.Comparedtothe2types,thechemicalattachmentisgenerallybelievedtobemorepracticalandisthem
3、ostimportanttypeoffilmattachment?Studyonadhesionofpaintfilmiscoatedonthesurfaceoftheobject,3aspectsneedtopayattentiontotheproblem:(1)aliquidmembranematerialwettingdegreeonboard;(2)theformationofsubstratesurfacedirectionaladsorptionlayer;(3)filmandsubstra
4、teinterfaceformelectricdoublelayer?Theadhesionofthefilmdependsonthepolaritygroupsofthepolymer(orlowermolecularprepolymer)inthefilm-formingmaterial,suchas-OH,-C00H,andthecombinationofthepolargroupsonthesurfaceofthecoating.Inordertomakethepolargroupwithgoo
5、d,requirementsofpolymermoleculeshascertainliquidity,sothatpolymermoleculesbettermoistsubstrate,thepolarpolymerisclosetothepolarbasesurface:whenthedistancebetweenthemoleculesgetsverysmall(lessthan1A),polargroupbecauseofcomprehensiveFanDehua,chemicalaffini
6、ty,hydrogenbondingcohesiontobalanceattachment?2polarityofpaintfilmandcoatedsurfacewZ07}m,fromthepolarityandmolecularstructure,molecularinteractionperspective,polargrouporientedpolymermolecularadhesionproducedinthecoatingfilmofthemutualattractionbetweenth
7、epolargroupandthecoatedsurfacesofthepolarmolecule?Onlybetweenthetwopolargroupstoadapt,togetgoodadhesionofthepaintfilm;ontheotherhand,paintonthepolarityofgoodnonpolarplate,ornon-polarpaintonthepolarplate,willgetgoodadhesionofpaintfilm.isdirt,grease,dust,r
8、educethepolarityofthesurfaceofthesubstrate,reducepolarityofthepaintexample,dryingaminoaminoresin-CH20HinThepolarbasefilmandthesurfaceofanypartywillleadtoadeclineinreducedadhesiontosubstratesurface:(1)therewillcauseadhesion
