nyob rau hauv ob peb lub xyoo dhau los tau los txo cov kuab tshuaj uas tso tawm rau cov huab cua. Cov no yog hu ua VOCs (volatile organic compounds) thiab, ua tau zoo, lawv suav nrog tag nrho cov kuab tshuaj uas peb siv tshwj tsis yog acetone, uas muaj cov photochemical reactivity tsawg heev thiab tau raug zam raws li VOC hnyav.
Tab sis yuav ua li cas yog tias peb tuaj yeem tshem tawm cov kuab tshuaj tag nrho thiab tseem tau txais kev tiv thaiv zoo thiab cov txiaj ntsig zoo nkauj nrog tsawg kawg ntawm kev siv zog?
Qhov ntawd yuav zoo heev - thiab peb tuaj yeem ua tau. Cov thev naus laus zis uas ua rau qhov no ua tau yog hu ua UV kho. Nws tau siv txij li xyoo 1970s rau txhua yam khoom siv xws li hlau, yas, iav, ntawv thiab, nce ntxiv, rau ntoo.
UV-kho coatings kho thaum raug ultraviolet lub teeb nyob rau hauv nanometer ntau yam ntawm qhov qis kawg los yog qis dua pom lub teeb. Lawv qhov zoo muaj xws li kev txo qis lossis ua kom tiav ntawm VOCs, pov tseg tsawg dua, yuav tsum muaj qhov chaw hauv pem teb tsawg dua, kev tuav tam sim thiab stacking (yog li tsis tas yuav ziab racks), txo cov nqi zog thiab cov nqi ntau lawm.
Ob qhov tsis zoo tseem ceeb yog tus nqi pib siab rau cov khoom siv thiab nyuaj ua tiav cov khoom siv 3D complex. Yog li nkag mus rau hauv UV curing feem ntau yog txwv rau cov khw loj ua cov khoom ncaj nraim xws li lub qhov rooj, vaj huam sib luag, pem teb, luas thiab cov khoom npaj sib dhos.
Txoj hauv kev yooj yim tshaj plaws kom nkag siab txog UV-kho tiav yog los sib piv nrog cov txheej txheem catalyzed tiav uas koj yuav paub. Raws li nrog catalyzed tiav, UV-kho tiav tiav muaj cov cob kom ua tiav, cov kuab tshuaj los yog hloov pauv rau thinning, ib qho catalyst los pib qhov kev sib txuas thiab coj mus rau kev kho thiab qee cov khoom ntxiv xws li flatting agents los muab cov yam ntxwv tshwj xeeb.
Ib tug xov tooj ntawm thawj resins yog siv, xws li derivatives ntawm epoxy, urethane, acrylic thiab polyester.
Nyob rau hauv txhua rooj plaub, cov resins kho mob heev thiab hnyav- thiab khawb-resistant, zoo ib yam li catalyzed (hloov) kua roj vanish. Qhov no ua rau kev kho tsis pom kev nyuaj yog tias cov yeeb yaj kiab kho tau yuav tsum tau puas.
UV-kho tiav tiav tuaj yeem yog 100 feem pua ntawm cov khoom ua kua. Ntawd yog, lub thickness ntawm dab tsi yog tso rau ntawm ntoo yog tib yam li lub thickness ntawm kho txheej. Tsis muaj dab tsi yuav evaporate. Tab sis thawj resin yog tuab heev rau daim ntawv thov yooj yim. Yog li cov tuam ntxhab ntxiv me me reactive molecules kom txo cov viscosity. Tsis zoo li cov kuab tshuaj, uas evaporate, cov ntxiv molecules crosslinks nrog cov resin loj dua molecules los tsim cov zaj duab xis.
Cov kuab tshuaj los yog dej kuj tuaj yeem muab ntxiv ua thinners thaum xav tau ib zaj duab xis thinner, piv txwv li, rau lub tsho tiv no. Tab sis lawv tsis yog feem ntau yuav tsum tau ua kom tiav sprayable. Thaum cov kuab tshuaj los yog dej ntxiv, lawv yuav tsum tau tso cai, los yog ua (hauv qhov cub), kom evaporate ua ntej UV curing pib.
Cov catalyst
Tsis zoo li catalyzed varnish, uas pib kho thaum lub catalyst ntxiv, cov catalyst nyob rau hauv ib tug UV-kho tag, hu ua "photoinitiator," tsis ua dab tsi txog thaum nws raug rau lub zog ntawm UV teeb. Tom qab ntawd nws pib cov saw hlau ceev ceev uas txuas tag nrho cov molecules hauv txheej ua ke los tsim cov yeeb yaj kiab.
Cov txheej txheem no yog dab tsi ua rau UV-kho tiav tas li tshwj xeeb. Nws yog qhov tseem ceeb tsis muaj txee- lossis lub lauj kaub lub neej rau kev ua tiav. Nws tseem nyob hauv daim ntawv ua kua kom txog thaum nws raug UV teeb. Tom qab ntawd nws kho tag nrho hauv ob peb feeb. Nco ntsoov tias lub hnub ci tuaj yeem tshem tawm qhov kho kom zoo, yog li nws tseem ceeb heev kom tsis txhob muaj qhov tshwm sim no.
Tej zaum nws yuav yooj yim dua los xav txog cov catalyst rau UV txheej ua ob ntu es tsis yog ib qho. Muaj lub photoinitiator twb nyob rau hauv qhov kawg - nyob ib ncig ntawm 5 feem pua ntawm cov kua - thiab muaj lub zog ntawm lub teeb UV uas tso nws tawm. Yog tsis muaj ob, tsis muaj dab tsi tshwm sim.
Cov yam ntxwv tshwj xeeb no ua rau nws muaj peev xwm rov qab cov tshuaj pleev xim sab nraud ntawm qhov ntau ntawm UV teeb thiab siv qhov ua tiav dua. Yog li pov tseg yuav luag tag nrho.
Lub teeb UV tsoos yog lub teeb mercury-vapor nrog lub ntsej muag elliptical los sau thiab coj lub teeb mus rau qhov chaw. Lub tswv yim yog tsom lub teeb rau qhov siab tshaj plaws hauv kev teeb tsa ntawm photoinitiator.
Nyob rau hauv lub xyoo caum dhau los los yog li ntawd, LEDs (lub teeb-emitting diodes) tau pib hloov cov tsoos qhov muag teev vim hais tias LEDs siv tsawg hluav taws xob, kav ntev npaum li cas, tsis tas yuav sov thiab muaj ib tug nqaim wavelength ntau ces lawv tsis tsim ze li ntawm. ntau teeb meem-ua rau kub. Cov cua sov no tuaj yeem ua rau cov resins hauv cov ntoo, xws li hauv cov ntoo thuv, thiab cov cua sov yuav tsum tau tso tseg.
Txoj kev kho yog tib yam, txawm li cas los xij. Txhua yam yog "line of sight." Qhov ua tiav tsuas yog kho yog tias UV teeb tawm tsam nws los ntawm qhov chaw ruaj khov. Cov cheeb tsam hauv qhov ntxoov ntxoo los yog tawm ntawm lub teeb pom kev tsis kho. Qhov no yog ib qho kev txwv tseem ceeb ntawm UV kho lub sijhawm tam sim no.
Txhawm rau kho cov txheej txheem ntawm txhua yam khoom, txawm tias ib yam dab tsi zoo li lub tiaj tus li profiled molding, lub teeb yuav tsum tau npaj kom lawv tawm tsam txhua qhov chaw ntawm tib qhov kev ncua deb kom phim cov txheej txheem ntawm txheej. Qhov no yog vim li cas cov khoom tiaj tus tsim feem ntau ntawm cov haujlwm uas tau coated nrog UV-kho tiav.
Ob txoj kev npaj rau UV-txheej daim ntawv thov thiab kho yog kab ncaj nraim thiab chamber.
Nrog txoj kab ncaj nraim, cov khoom tiaj tus los yog ze li ntawm cov khoom txav txav mus rau hauv ib qho kev siv tshuaj tsuag los yog cov menyuam los ntawm lub tshuab nqus tsev, tom qab ntawd los ntawm qhov cub yog tias tsim nyog tshem tawm cov kuab tshuaj los yog dej thiab thaum kawg nyob rau hauv ib qho ntawm UV teeb coj los kho. Cov khoom tuaj yeem muab tso rau tam sim ntawd.
Hauv chav tsev, cov khoom feem ntau yog dai thiab txav mus raws ib qho khoom siv los ntawm tib cov kauj ruam. Lub chamber ua kom tiav ntawm txhua sab ib zaug thiab ua tiav ntawm cov khoom tsis sib xws, peb sab.
Lwm qhov ua tau yog siv cov neeg hlau tig cov khoom nyob rau pem hauv ntej ntawm UV teeb lossis tuav lub teeb UV thiab txav cov khoom nyob ib puag ncig nws.
Cov neeg muag khoom ua lub luag haujlwm tseem ceeb
Nrog UV-kho coatings thiab cov cuab yeej siv, nws tseem ceeb dua los ua haujlwm nrog cov neeg muab khoom dua li cov kua roj vanish. Qhov laj thawj tseem ceeb yog tus naj npawb ntawm cov hloov pauv uas yuav tsum tau sib koom ua ke. Cov no suav nrog lub wavelength ntawm qhov muag teev lossis LEDs thiab lawv qhov kev ncua deb ntawm cov khoom, kev tsim cov txheej txheem thiab cov kab nrawm yog tias koj siv cov kab tiav.
Post lub sij hawm: Apr-23-2023
