涂装基本知识之Organic-coatings

JotunProtectiveOrganiccoatingsJotunKoreaCoatingsCo.,Ltd.Coatingadvisor:Danny(DanGuo-qiang)2015-07JotunProtectiveContents1.Air-oxidizingcoatings(Dryoil,Alkyd)2.Solventdrylacquers(Acrylic,C/rubber)3.Co-reactivecoatings(Epoxy,Polyurethane)4.Emulsion-typecoatings(Acrylic,Epoxy)5.Heat-condensingcoatings(Phenolic)JotunProtectiveNatutralAir-oxidizingcoatingsDryingoilIftheiodinevalue(碘值)ofoilismorethan130,theoilintheairwillgraduallycureandformafilm.Remark:JotunProtectiveNatutralAir-oxidizingcoatingsWhentheglycerolandthefattyacidarecombinedintooil,thechemicalformulashownbelowresults:JotunProtectiveNatutralAir-oxidizingcoatingsThedifferencebetweenfatsandoilsisthatfatsaretriglyceridesformedwithsaturatedfattyacids(nodoublebond)andoilsareformedwithunsaturatedfattyacids(oneormoredoublebonds).Linseedoilacid:CH3CH2CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH亚麻油的主要成分Tungoilacid:CH3(CH2)3CH=CHCH=CHCH=CH（CH2)7COOH桐油的主要成分Castoroilacid:CH3(CH2)5CH(OH)CH2CH=CH(CH2)7COOH蓖麻油的主要成分JotunProtectiveNatutralAir-oxidizingcoatingsThedryingofanoil:OxygenattacksthecarbondoublebondsJotunProtectiveNatutralAir-oxidizingcoatingsThedryingofanoil:ThecarbondoublebondsrebuildJotunProtectiveNatutralAir-oxidizingcoatingsThedryingofanoil:Thecarbon-carboncrosslinkJotunProtectiveNatutralAir-oxidizingcoatingsThedryingofanoil:―C-O-O-―groupattack―C=C‖bondsJotunProtectiveNatutralAir-oxidizingcoatingsDriersfornaturaldryingoils:Oilsdryslowlywithouttheuseofmetallicdriers,metallicdriersareusedascatalysttoachievepracticaldryingtime.Co2++ROOH——RO·+OH-+Co3+Co3++ROOH——ROO·+H++Co2+Mostcommonuseddriersarelead,manganese,cobaltnapthanates,aluminum,zirconuim.JotunProtectiveNatutralAir-oxidizingcoatingsSaponification:toconvert(afat)intosoapbytreatingwithanalkaliThelackofresistancetoalkaliisoneofthemajordryingoildeficiencies.Evenmildalkaliestendtoreactwiththeoilpartofthemolecule,causingthedisintegrationofthecoating.JotunProtectiveSyntheticAir-oxidizingcoatingsAlloftheoil-modifiedresinsarebasedonunsaturatedfattyacids,suchasAlkyd,Epoxyester,oil-modifiedurethane,andvarnish.JotunProtectiveSyntheticAir-oxidizingcoatingsAlkydareundoubtedlythemostcommonofalloftheoilmodifiedmaterials,astheyhavethebroadestusageJotunProtectiveSyntheticAir-oxidizingcoatingsAlkydscanbeclassifiedinanumberofdifferentways,themostcommonofwhichisaccordingtotheoillength:1,Shortlength(oillevel40%)2,Mediumlength3,Longlength(oillevel60%)Thelengthinfluencesallpropertiesandistheprimaryfactorindeterminingsolubility,viscosity,flexibilty,andhardnessJotunProtectiveSyntheticAir-oxidizingcoatingsModifiedalkyd:Vinylalkyd–GoodweatherresistanceSiliconealkyd–GoodheatresistanceUralkyd–HighqualitymaintenancefinishesPolyamidemodifiedalkyds–GreaterfilmbuildisokEpoxyester–Astepabovealkydresinforchemicalresistance,andmakeitharderJotunProtectiveSolventdrylacquersLacquersarematerialsthatformacoatingbyevaporationofsolvents.1,Vinylcoatings2,Chlorinatedrubbercoatings3,Acrylicpolymers4,CoaltarcoatingsJotunProtectiveVinylcoatingsAllthematerialswhichcontainthevinyldoublebondgroupcouldbecalledvinylmaterialstechnically.JotunProtectiveVinylcoatings•Goodchemicalresistance(e.g.,acids,alkalies,andsalt)•Goodwaterresistance(usedasasealcoat)•GoodageresistanceJotunProtectiveVinylcoatings•Goodchemicalresistance(e.g.,acids,alkalies,andsalt)•Goodwaterresistance(usedasasealcoat)•GoodageresistanceJotunProtectiveChlorinatedrubbercoatingsChlorinatedrubbercoatingsconsistofnaturallrubberreactedwithchlorine.Thisformsaveryhard,horny-texturedresinlackingintheelasticofrubberproduct.Itisodorless,tasteless,andnontoxic(usuallyusedontheconcretesurfaceofswimmingpool).JotunProtectiveChlorinatedrubbercoatings•Goodheatresistance(upto125C)•Goodelectricalproperties(dielectricconstantat25Cis2200voltspermil)•Goodadhesion•Goodchemicalresistance•FastthroughdryJotunProtectiveChlorinatedrubbercoatingsJotunProtectiveAcrylicpolymersAcrylicresinsareprimarilypolymericderivativesofacrylicandmethacrylicacid.JotunProtectiveAcrylicpolymers•Thepolymerscanvaryfromveryhard,brittlematerialstoverysoft,flexibleplasticsduetothevariationinesterificationandthecopolymerizationofvariousesterifiedacrylicmonomers.•Acrylicresinsarecharacterizedprimarilybytheirwater-whitecolor,resistancetochangeincolorovertime.•Excellentdurabilitypropertiesduetothechemicalnatureofthepolymeritself.•Usedmainlyasafinishcoat(e.g.,onautomobiles,freezersetc.)JotunProtectiveCoaltarcoatingsJotunProtectiveCoaltarcoatingsThereareanumberofcoaltarcoatingsmadebydissolvingprocessedcoaltarpich,orablendofthesepitched,insuitablesolvent.Theydryentirelybyevaporationofthesolventsandtheirpropertiesdependtoagreatextentonthetypeofcoaltarrawmaterialsandtheblendingofthesemateials.JotunProtectiveCoaltarcoatings•Lowpermeabilitytomoisture•Highdielectricresistance•Notaffectedbymineraloil,butcanbedissolvedbyavegetableoranimaloil,grease,anddetergents•Havegoodresistancetoweakacids,alkalies,salts,sea-waterandotheraggressiveatmosphere•Tendencytoalligatorwhenexposedtodirectsun-light(theupperlayerofthefilmcontractsandslipsoverthesofterunderlayercausingalliga