Muaj ntau yam uas cuam tshuam rau kev kho thiab ziab ntawm Waterborne UV txheej thaum siv UV kho tshuab.Daim ntawv no tsuas yog tham txog yam tseem ceeb xwb.Cov xwm txheej no suav nrog cov hauv qab no:
1. Cov nyhuv ua ntej ziab ntawm aqueous system ntawm UV curing
Cov txheej txheem kom qhuav ua ntej kho muaj qhov cuam tshuam zoo rau kev kho kom ceev.Thaum nws tsis qhuav los yog tsis tiav, qhov kev kho ceev yog qeeb, thiab tus nqi gelation tsis nce ntxiv nrog rau kev ncua sij hawm raug.Qhov no yog vim lub ntim ntau dhau.Txawm hais tias cov dej muaj qee yam cuam tshuam rau inhibiting polymerization ntawm oxygen, nws tsuas tuaj yeem ua rau saum npoo ntawm tus number case zaj duab xis solidify sai, tsuas yog ua kom tiav qhov ziab, tab sis tsis ua kom qhuav qhuav.Raws li lub kaw lus muaj cov dej ntau, lub kaw lus yuav raug rau cov qauv thiab ntawv pov thawj thaum kho ntawm qhov kub thiab txias.Nrog rau qhov ceev ceev evaporation ntawm cov dej nyob rau saum npoo ntawm tus number case zaj duab xis, nto ntawm tus number case zaj duab xis solidifies sai heev, thiab cov dej hauv zaj duab xis yog qhov nyuaj rau kev khiav tawm.Ib tug loj npaum li cas ntawm cov dej nyob rau hauv tus number case zaj duab xis, tiv thaiv kom txhob ntxiv consolidation thiab pov thawj ntawm tus number case zaj duab xis thiab txo qhov curing ceev.Tsis tas li ntawd, qhov kub thiab txias thaum lub sij hawm UV irradiation muaj kev cuam tshuam zoo rau kev kho ntawm UV txheej.Qhov kub siab dua, qhov zoo ntawm cov cuab yeej kho.Yog li ntawd, yog hais tias preheating yog siv, lub curing khoom ntawm txheej yuav txhim khu kev qha thiab adhesion yuav zoo dua.
2. Cov nyhuv ntawm photoinitiator ntawm Waterborne UV curing
Lub photoinitiator yuav tsum muaj qee yam miscibility nrog cov dej-raws li UV curing system thiab dej vapor volatility tsawg, thiaj li hais tias cov photoinitiator yuav dispersed, uas yog conducive rau cov txaus siab curing nyhuv.Txwv tsis pub, thaum lub sij hawm ziab, lub photoinitiator yuav volatilize nrog cov dej vapor, txo cov efficiency ntawm tus pib.Cov photoinitiators sib txawv rau cov ntim luam yeeb muaj qhov sib txawv nqus wavelengths.Lawv siv ua ke tuaj yeem nqus tau ultraviolet rays ntawm qhov sib txawv wavelengths, txhim kho qhov nqus ntawm ultraviolet hluav taws xob, thiab ua kom nrawm nrawm ntawm tus number case zaj duab xis.Yog li ntawd, tus number case zaj duab xis nrog ceev curing tus nqi thiab kev ua tau zoo heev tuaj yeem tau los ntawm kev siv ntau yam photoinitiators thiab kho qhov piv ntawm ntau yam photoinitiators.Cov ntsiab lus ntawm compound photoinitiator nyob rau hauv lub system yuav tsum tau tsim kom zoo, tsawg heev yog tsis conducive rau lub nqus kev sib tw nrog pigments;Lub teeb ntau dhau tsis tuaj yeem nkag mus rau hauv cov txheej txheem zoo.Thaum pib, qhov kev kho tus nqi ntawm cov txheej txheej nce ntxiv nrog qhov nce ntawm qhov sib xyaw photoinitiator, tab sis thaum cov tshuaj sib xyaw photoinitiator nce mus rau qee tus nqi, thiab tom qab ntawd nce nws cov ntsiab lus, tus nqi kho yuav txo qis.
3. Cov nyhuv ntawm Waterborne UV curing resin ntawm UV curing
Cov dej-raws li UV curable resin xav tau dawb radical lub teeb curable saj zawg zog ntim, uas yuav tsum tau cov resin molecules yuav tsum muaj unsaturated pawg.Nyob rau hauv lub irradiation ntawm ultraviolet lub teeb, cov unsaturated pawg nyob rau hauv lub molecules yog cross-linked, thiab cov kua txheej ua ib tug khoom txheej.Feem ntau, txoj kev qhia txog acryloyl, methacryloyl, vinyl ether lossis allyl yog siv los ua kom cov khoom siv hluavtaws muaj cov ntawv pov thawj tsis txaus ntseeg, kom nws tuaj yeem kho tau raws li qhov tsim nyog.Acrylate feem ntau siv vim nws cov tshuaj tiv thaiv siab.Rau cov dawb radical UV curing system, nrog rau kev nce ntawm ob daim ntawv cog lus cov ntsiab lus nyob rau hauv lub molecule, lub crosslinking ceev ntawm cov zaj duab xis yuav nce, thiab lub curing ceev yuav ceev.Ntxiv mus, resins nrog cov qauv sib txawv muaj qhov sib txawv ntawm kev kho tus nqi.Cov tshuaj tiv thaiv kev ua haujlwm ntawm ntau pawg ua haujlwm feem ntau nce hauv qhov kev txiav txim hauv qab no: vinyl ether < allyl < methacryloyl < acryloyl .Yog li ntawd, acryloyl thiab methacryloyl feem ntau yog siv los ua kom cov resin muaj qhov nrawm nrawm dua.
4. Cov nyhuv ntawm cov xim ntawm UV curing ntawm Waterborne Coatings
Raws li cov khoom tsis zoo nkauj hauv Waterborne UV curing coatings, pigments sib tw nrog cov neeg pib nqus UV teeb, uas cuam tshuam rau cov yam ntxwv kho ntawm UV curing system.Vim tias cov xim tuaj yeem nqus tau ib feem ntawm lub zog hluav taws xob, nws yuav cuam tshuam rau kev saib xyuas ntawm photoinitiator rau cov khoom siv lub teeb nqus, thiab tom qab ntawd cuam tshuam rau cov concentration ntawm cov dawb radicals uas tuaj yeem tsim tau, uas yuav txo qhov kev kho ceev.Txhua xim ntawm cov xim muaj qhov sib txawv absorptivity (transmittance) rau txawv wavelengths ntawm lub teeb.Qhov me dua qhov nqus ntawm cov xim, qhov sib kis ntau dua, thiab qhov nrawm nrawm ntawm txheej txheej.Cov pa roj carbon dub muaj peev xwm nqus ultraviolet siab thiab kho qeeb tshaj plaws.Cov xim dawb muaj cov khoom muaj zog muaj zog, uas tseem cuam tshuam kev kho.Feem ntau hais lus, qhov kev nqus ntawm ultraviolet lub teeb yog: Dub > ntshav > Xiav > Cyan > Ntsuab > daj > liab.
Kev faib ua feem sib txawv thiab cov concentration ntawm tib cov xim muaj qhov sib txawv ntawm kev kho ceev ntawm cov kua nplaum zaj duab xis.Nrog rau qhov nce ntawm cov ntsiab lus pigment, qhov curing tus nqi ntawm cov kua nplaum zaj duab xis txo qis hauv ntau qib.Tus nqi ntawm cov xim daj muaj qhov cuam tshuam loj tshaj plaws ntawm kev kho tus nqi ntawm cov xim zaj duab xis, ua raws li cov xim liab thiab xim ntsuab.Vim tias cov xim dub muaj qhov nqus siab tshaj plaws ntawm lub teeb ultraviolet, ua rau kev xa tawm ntawm cov cwj mem dub qis tshaj plaws, qhov kev hloov ntawm nws qhov ntau npaum li cas tsis muaj txiaj ntsig zoo rau kev kho tus nqi ntawm tus number case zaj duab xis.Thaum cov xim ntawm cov xim ntau dhau lawm, qhov kev kho tus nqi ntawm cov txheej txheej ntawm tus number case yog sai dua li ntawm cov phaj, tab sis cov xim ntawm cov txheej txheej absorbs ntau ntawm ultraviolet lub teeb, uas txo cov transmittance ntawm ultraviolet lub teeb. thiab cuam tshuam rau qhov curing ntawm qhov sib sib zog nqus txheej ntawm tus number case zaj duab xis, uas ua rau lub nto txheej ntawm tus number case zaj duab xis curing tab sis hauv qab txheej tsis curing, uas yog ib qho yooj yim los tsim "wrinkle" tshwm sim.
Lub sij hawm xa tuaj: Plaub Hlis-05-2022