Automotive Applications ntawm UV-kho Coatings

UV thev naus laus zis tau txiav txim siab los ntawm ntau tus los ua "tshaj tawm" thev naus laus zis rau kev kho cov txheej txheem txheej txheem. Txawm hais tias nws yuav yog qhov tshiab rau ntau yam hauv kev lag luam thiab kev lag luam automotive coatings, nws tau nyob ib puag ncig rau ntau tshaj peb xyoo lawm hauv lwm qhov kev lag luam…

UV thev naus laus zis tau txiav txim siab los ntawm ntau tus los ua "tshaj tawm" thev naus laus zis rau kev kho cov txheej txheem txheej txheem. Txawm hais tias nws yuav yog qhov tshiab rau ntau yam hauv kev lag luam thiab kev lag luam automotive coatings, nws tau nyob ib ncig ntawm ntau tshaj peb xyoo lawm hauv lwm qhov kev lag luam. Cov neeg taug kev ntawm UV-coated vinyl flooring khoom txhua hnub, thiab ntau ntawm peb muaj lawv hauv peb lub tsev. UV kho tshuab kuj tseem ua lub luag haujlwm tseem ceeb hauv kev lag luam khoom siv hluav taws xob. Piv txwv li, hauv cov xov tooj ntawm tes, UV thev naus laus zis yog siv rau hauv cov txheej txheem ntawm cov yas vaj tsev, txheej txheej los tiv thaiv cov khoom siv hluav taws xob sab hauv, UV nplaum sib txuas cov khoom sib txuas thiab txawm tias nyob rau hauv kev tsim cov xim xim pom ntawm qee lub xov tooj. Ib yam li ntawd, kev lag luam fiber ntau thiab DVD / CD siv UV txheej thiab cov nplaum tshwj xeeb thiab yuav tsis muaj nyob raws li peb paub niaj hnub no yog tias UV thev naus laus zis tsis tau ua rau lawv txoj kev loj hlob.

Yog li dab tsi yog UV curing? Feem ntau yooj yim, nws yog txheej txheem rau kev sib txuas (kho) txheej txheej los ntawm cov txheej txheem tshuaj pib thiab txhawb nqa los ntawm UV lub zog. Nyob rau hauv tsawg tshaj li ib feeb, lub txheej yog hloov los ntawm ib tug kua rau ib tug khoom. Muaj qhov sib txawv hauv qee yam ntawm cov khoom siv raw thiab kev ua haujlwm ntawm cov resins hauv txheej, tab sis cov no yog pob tshab rau cov neeg siv txheej.

Cov cuab yeej siv xws li cov phom cua atomized, HVLP, rotary tswb, ntws txheej, yob txheej thiab lwm yam khoom siv UV txheej. Txawm li cas los xij, es tsis txhob nkag mus rau hauv qhov cub thermal tom qab txheej txheej thiab cov kuab tshuaj flash, txheej txheej yog kho nrog UV lub zog tsim los ntawm UV teeb lub teeb ua haujlwm nyob rau hauv ib yam uas illuminates txheej nrog tsawg kawg nkaus ntawm lub zog yuav tsum tau ua kom tiav.

Cov tuam txhab thiab kev lag luam uas siv cov cwj pwm ntawm UV thev naus laus zis tau xa cov txiaj ntsig zoo tshaj plaws los ntawm kev muab cov khoom lag luam zoo tshaj plaws thiab cov khoom lag luam zoo kawg thaum txhim kho cov txiaj ntsig.

Exploiting UV's Attributes

Dab tsi yog cov cwj pwm tseem ceeb uas tuaj yeem siv tau? Ua ntej, raws li tau hais dhau los, kev kho yog ceev heev thiab tuaj yeem ua tiav ntawm chav tsev kub. Qhov no tso cai rau kev kho kom zoo ntawm cov tshav kub-sensitive substrates, thiab tag nrho cov txheej txheej tuaj yeem kho tau sai heev. UV curing yog tus yuam sij rau kev tsim khoom yog tias qhov txwv (lub raj mis-caj dab) hauv koj cov txheej txheem yog lub sijhawm kho ntev. Tsis tas li ntawd, qhov ceev tso cai rau cov txheej txheem nrog tus hneev taw me dua. Rau kev sib piv, cov txheej txheem ib txwm xav tau 30-feeb ci ntawm kab ceev ntawm 15 fpm yuav tsum 450 ft ntawm conveyor hauv qhov cub, thaum lub UV kho txheej yuav xav tau 25 ft (lossis tsawg dua) ntawm cov khoom siv.

UV cross-linking cov tshuaj tiv thaiv tuaj yeem ua rau txheej txheej nrog lub cev muaj zog ntau dua. Txawm hais tias cov coatings tuaj yeem tsim los ua ib qho nyuaj rau kev siv xws li hauv pem teb, lawv tuaj yeem ua tau yooj yim heev. Ob hom txheej txheej, nyuaj thiab yoog raws, yog siv rau hauv kev siv tsheb.

Cov cwj pwm no yog tus tsav tsheb rau kev txhim kho txuas ntxiv thiab nkag mus rau UV thev naus laus zis rau cov txheej txheem tsheb. Tau kawg, muaj cov teeb meem cuam tshuam nrog UV kho ntawm cov txheej txheem kev lag luam. Qhov kev txhawj xeeb tseem ceeb rau tus tswv txheej txheem yog lub peev xwm nthuav tawm txhua qhov chaw ntawm qhov nyuaj rau UV lub zog. Qhov ua tiav ntawm cov txheej txheej yuav tsum raug rau qhov tsawg kawg nkaus UV lub zog yuav tsum tau kho cov txheej. Qhov no yuav tsum tau ua tib zoo tsom xam ntawm ib feem, racking ntawm qhov chaw, thiab kev teeb tsa lub teeb kom tshem tawm cov duab ntxoov ntxoo. Txawm li cas los xij, tau muaj kev txhim kho tseem ceeb hauv cov teeb, cov khoom siv raw thiab cov khoom tsim tawm uas kov yeej feem ntau ntawm cov kev txwv no.

Automotive Forward Teeb pom kev zoo

Daim ntawv thov tsheb tshwj xeeb uas UV tau dhau los ua tus qauv thev naus laus zis yog nyob rau hauv kev lag luam tsheb rau pem hauv ntej teeb pom kev lag luam, qhov twg UV txheej tau siv rau ntau tshaj 15 xyoo thiab tam sim no hais kom 80% ntawm kev ua lag luam. Lub teeb taub hau yog tsim los ntawm ob yam tseem ceeb uas yuav tsum tau coated - lub lens polycarbonate thiab lub vaj tsev nyob. Lub lens yuav tsum muaj txheej tawv heev, khawb-tiv taus los tiv thaiv polycarbonate los ntawm cov khoom thiab kev tsim txom lub cev. Lub tsev nyob hauv lub tsev muaj UV basecoat (primer) uas khi lub substrate thiab muab lub ntsej muag du rau metallization. Kev lag luam reflector basecoat yog tam sim no tseem ceeb 100% UV kho. Cov laj thawj tseem ceeb rau kev saws me nyuam tau txhim kho cov khoom tsim tau zoo, cov txheej txheem me me hneev taw thiab cov txheej txheem zoo tshaj plaws-kev ua tau zoo.

Txawm hais tias cov coatings siv yog UV kho, lawv muaj cov kuab tshuaj. Txawm li cas los xij, feem ntau ntawm cov overspray yog reclaimed thiab recycled rov qab mus rau hauv tus txheej txheem, ua tiav ze rau 100% hloov efficiency. Lub hom phiaj rau kev txhim kho yav tom ntej yog ua kom cov khib nyiab kom 100% thiab tshem tawm qhov xav tau ntawm oxidizer.

Sab nrauv yas qhov chaw

Ib qho ntawm cov ntawv thov tsis tshua paub yog kev siv UV curable clearcoat tshaj molded-hauv-xim lub cev sab moldings. Thaum xub thawj, cov txheej no tau tsim los txo cov yellowing ntawm sab nrauv ntawm lub cev sab hauv moldings. Cov txheej yuav tsum tawv heev thiab yoog raws kom muaj adhesion yam tsis muaj kev tawg ntawm cov khoom tawm tsam cov molding. Cov neeg tsav tsheb rau kev siv cov txheej txheem UV hauv daim ntawv thov no yog kev kho kom ceev (cov txheej txheem me me) thiab cov khoom ua tau zoo.

SMC Lub Cev Vaj Huam Sib Luag

Sheet molding compound (SMC) yog cov khoom siv sib xyaw uas tau siv los ua lwm yam hlau rau ntau tshaj 30 xyoo. SMC muaj cov iav-fiber-filled polyester cob uas tau muab pov rau hauv cov ntawv. Cov nplooj ntawv no ces muab tso rau hauv cov pwm compression thiab tsim rau hauv lub cev panels. SMC tuaj yeem xaiv tau vim tias nws txo qis cov cuab yeej siv rau kev ua haujlwm me me, txo qhov hnyav, muab cov hniav thiab corrosion tsis kam, thiab muab ntau dua latitude rau stylists. Txawm li cas los xij, ib qho ntawm cov teeb meem hauv kev siv SMC yog qhov ua tiav ntawm cov khoom hauv cov khoom sib dhos. SMC yog ib qho porous substrate. Thaum lub cev vaj huam sib luag, tam sim no ntawm lub tsheb, mus los ntawm lub qhov cub clearcoat xim, xim tsis xws luag hu ua "porosity pop" tuaj yeem tshwm sim. Qhov no yuav xav tau yam tsawg kawg ib qho chaw kho, lossis yog tias muaj "pops" txaus, tag nrho rov ua dua ntawm lub cev lub plhaub.

Peb xyoos dhau los, hauv kev sib zog los tshem tawm qhov tsis xws luag no, BASF Coatings tau luam tawm UV / thermal hybrid sealer. Yog vim li cas rau kev siv ib tug hybrid kho yog hais tias lub overspray yuav kho rau ntawm qhov chaw tsis tseem ceeb. Cov kauj ruam tseem ceeb los tshem tawm cov "porosity pops" yog qhov cuam tshuam rau UV lub zog, ua rau muaj qhov sib txawv ntawm qhov sib txuas ntawm cov txheej txheej ntawm qhov chaw tseem ceeb. Yog tias lub sealer tsis tau txais qhov tsawg kawg nkaus UV lub zog, cov txheej tseem dhau tag nrho lwm yam kev ua haujlwm.

Kev siv cov cuab yeej kho dual-kho hauv qhov piv txwv no muab cov txheej txheem tshiab los ntawm kev siv UV kho thaum muab kev nyab xeeb rau txheej txheej hauv daim ntawv thov muaj txiaj ntsig. Daim ntawv thov no tsis tsuas yog qhia tau hais tias UV thev naus laus zis tuaj yeem muab cov txheej txheem tshwj xeeb, nws tseem qhia tau tias UV-kho txheej txheej siv tau ntawm cov khoom muaj nqis, siab ntim, loj thiab cov khoom siv tsheb. Cov txheej no tau siv rau kwv yees li ib lab lub cev panels.

OEM Clearcoat

Arguably, UV thev naus laus zis kev lag luam ntu nrog qhov pom tau siab tshaj plaws yog lub tsheb sab nrauv lub cev vaj huam sib luag Class A txheej. Ford Motor Company tau nthuav tawm UV thev naus laus zis ntawm lub tsheb qauv, lub tsheb Concept U, ntawm North American International Auto Show hauv 2003. Cov txheej txheem txheej txheem pom tau tias yog UV-kho clearcoat, tsim thiab muab los ntawm Akzo Nobel Coatings. Cov txheej no tau siv thiab kho dua ib tus neeg lub cev panels ua los ntawm ntau yam ntaub ntawv.

Ntawm Surcar, lub rooj sib tham tseem ceeb thoob ntiaj teb tsheb txheej txheej rooj sib tham tau tuav txhua xyoo hauv Fab Kis, DuPont Performance Coatings thiab BASF tau nthuav tawm hauv xyoo 2001 thiab 2003 ntawm UV-kho tshuab rau tsheb clearcoats. Tus neeg tsav tsheb rau qhov kev txhim kho no yog los txhim kho qhov teeb meem tseem ceeb ntawm cov neeg siv khoom txaus siab rau cov xim - khawb thiab mar resistance. Ob lub tuam txhab tau tsim hybrid-kho (UV & thermal) txheej. Lub hom phiaj ntawm kev ua raws txoj kev siv tshuab hybrid yog kom txo qis UV kho qhov nyuaj thaum ua tiav lub hom phiaj kev ua tau zoo.

DuPont thiab BASF tau teeb tsa cov kab tsav hauv lawv cov chaw. DuPont kab hauv Wuppertal muaj peev xwm kho tau tag nrho lub cev. Tsis tsuas yog cov tuam txhab txheej txheej yuav tsum tau ua kom pom cov txheej txheem zoo, lawv kuj yuav tsum tau ua kom pom cov tshuaj pleev xim. Ib qho ntawm lwm cov txiaj ntsig ntawm UV / thermal curing hais los ntawm DuPont yog tias qhov ntev ntawm qhov clearcoat feem ntawm cov kab tiav tuaj yeem raug txo los ntawm 50% tsuas yog txo qhov ntev ntawm lub qhov cub thermal.

Los ntawm sab engineering, Dürr System GmbH tau muab kev nthuav qhia ntawm lub tswv yim cog cog rau UV kho. Ib qho ntawm cov kev hloov pauv tseem ceeb hauv cov ntsiab lus no yog qhov chaw ntawm UV curing txheej txheem hauv cov kab tiav. Cov kev daws teeb meem suav nrog nrhiav UV teeb ua ntej, sab hauv lossis tom qab lub qhov cub thermal. Dürr xav tias muaj cov kev daws teeb meem engineering rau feem ntau ntawm cov txheej txheem kev xaiv uas suav nrog cov qauv tsim tam sim no hauv kev txhim kho. Fusion UV Systems kuj tau nthuav tawm cov cuab yeej tshiab - lub computer simulation ntawm UV-kho cov txheej txheem rau lub cev tsheb. Qhov kev txhim kho no tau ua los txhawb thiab ua kom tau txais kev pom zoo ntawm UV-kho thev naus laus zis hauv cov nroj tsuag sib dhos.

Lwm Daim Ntawv Thov

Kev txhim kho kev ua haujlwm txuas ntxiv rau cov txheej txheem yas siv rau hauv tsheb sab hauv, txheej txheej rau cov log hlau thiab lub log npog, clearcoats tshaj qhov loj molded-hauv-xim qhov chaw thiab rau hauv qab-hood qhov chaw. Cov txheej txheem UV txuas ntxiv raug lees paub raws li qhov chaw kho kom ruaj khov. Txhua yam uas tau hloov pauv tiag tiag yog tias cov txheej txheem UV hloov mus rau ntau qhov nyuaj, muaj txiaj ntsig ntau dua. Qhov kev ruaj ntseg thiab lub sij hawm ntev ntawm cov txheej txheem tau pom zoo nrog rau daim ntawv thov teeb pom kev zoo. Nws pib tshaj 20 xyoo dhau los thiab tam sim no yog tus qauv kev lag luam.

Txawm hais tias UV thev naus laus zis muaj qee qhov xav txog qhov "txias", qhov kev lag luam xav ua nrog cov thev naus laus zis no yog muab cov kev daws teeb meem zoo tshaj plaws rau cov neeg ua tiav cov teeb meem. Tsis muaj leej twg siv lub tshuab thev naus laus zis rau kev siv tshuab. Nws yuav tsum xa tus nqi. Tus nqi tuaj yeem tuaj rau hauv daim ntawv ntawm kev txhim kho cov khoom lag luam ntsig txog kev kho kom ceev. Los yog nws tuaj yeem los ntawm kev txhim kho lossis cov khoom tshiab uas koj tsis tuaj yeem ua tiav nrog cov thev naus laus zis tam sim no. Nws tuaj yeem los ntawm thawj zaug-zoo dua vim tias cov txheej txheej qhib rau cov av tsawg dua lub sijhawm. Nws tuaj yeem muab txoj hauv kev los txo lossis tshem tawm VOC ntawm koj qhov chaw. Lub tshuab tuaj yeem xa tus nqi. Kev lag luam UV thiab cov neeg ua tiav yuav tsum tau ua haujlwm txuas ntxiv ua ke los tsim cov kev daws teeb meem uas txhim kho cov kab tiav hauv qab.