UV-Curable Wood Coatings: Teb cov lus nug ntawm kev lag luam

Los ntawm Lawrence (Larry) Van Iseghem yog Thawj Tswj Hwm / CEO ntawm Van Technologies, Inc.

Dhau ntawm kev ua lag luam nrog cov neeg siv khoom lag luam thoob ntiaj teb, peb tau teb cov lus nug tsis txaus ntseeg thiab tau muab ntau cov kev daws teeb meem cuam tshuam nrog UV-kho coatings. Dab tsi hauv qab no yog qee cov lus nug ntau zaus, thiab cov lus teb nrog rau yuav muab kev pom zoo.

1. Dab tsi yog UV-curable coatings?

Hauv kev lag luam ntoo, muaj peb lub ntsiab ntawm UV-curable coatings.

100% active (qee zaum hu ua 100% solids) UV-kho coatings yog cov kua tshuaj muaj pes tsawg leeg uas tsis muaj cov kuab tshuaj los yog dej. Thaum daim ntawv thov, txheej yog tam sim ntawd raug rau UV zog yam tsis tas yuav qhuav los yog evaporate ua ntej kho. Cov txheej txheem siv txheej txheej reacts tsim ib txheej txheej txheej ntawm cov txheej txheem reactive piav thiab tsim nyog hu ua photopolymerization. Txij li thaum tsis muaj evaporation xav tau ua ntej kho, daim ntawv thov thiab cov txheej txheem kho tau zoo heev thiab siv tau zoo.

Waterborne los yog hnyav-borne hybrid UV-kho coatings obviously muaj xws li dej los yog hnyav los txo cov active (los yog khoom) cov ntsiab lus. Qhov kev txo qis hauv cov ntsiab lus no tso cai yooj yim dua rau kev tswj cov ntaub ntub dej ntub dej, thiab / lossis tswj cov viscosity ntawm txheej. Hauv kev siv, cov txheej txheem UV no tau siv rau ntawm cov ntoo los ntawm ntau txoj hauv kev thiab yuav tsum tau ua kom qhuav ua ntej UV kho.

UV-curable hmoov txheej kuj yog 100% cov khoom sib xyaw thiab feem ntau yog siv rau cov khoom siv hluav taws xob los ntawm electrostatic attraction. Thaum ua ntawv thov, lub substrate yog rhuab kom yaj cov hmoov, uas ntws tawm los ua ib zaj duab xis nto. Cov coated substrate ces tuaj yeem raug UV lub zog tam sim ntawd los pab kho. Lub resulting nto zaj duab xis yog tsis kub deformable los yog rhiab heev.

Muaj ntau qhov sib txawv ntawm cov txheej txheem UV-kho tau muaj uas muaj cov txheej txheem kho mob thib ob (thaum kub ua haujlwm, noo noo reactive, thiab lwm yam) uas tuaj yeem muab kev kho mob hauv thaj chaw uas tsis raug UV lub zog. Cov txheej txheem no feem ntau raug xa mus ua ob-kho coatings.

Txawm hais tias hom UV-kho tau siv, qhov kawg ntawm qhov kawg lossis txheej muab qhov tshwj xeeb zoo, ua haujlwm ntev thiab ua haujlwm.

2. Yuav ua li cas UV-curable coatings ua raws li cov ntoo sib txawv, nrog rau hom ntoo oily?

UV-curable coatings pom zoo adhesion rau feem ntau cov ntoo. Nws yog ib qho tseem ceeb kom paub tseeb tias muaj kev kho mob txaus los muab los ntawm kev kho mob thiab sib txuas adhesion rau lub substrate.

Muaj qee hom tsiaj uas ib txwm muaj roj heev thiab yuav tsum tau siv cov tshuaj nplaum-txhim primer, lossis "tiecoat." Van Technologies tau ua ntau yam kev tshawb fawb thiab kev loj hlob rau hauv adhesion ntawm UV-kho coatings rau cov ntoo hom. Kev tsim kho tsis ntev los no suav nrog ib qho UV-kho tau sealer uas tiv thaiv cov roj, kua thiab suab los ntawm kev cuam tshuam nrog UV-kho tau topcoat adhesion.

Xwb, cov roj tam sim no ntawm cov ntoo tuaj yeem raug tshem tawm ua ntej daim ntawv thov txheej los ntawm kev so nrog acetone lossis lwm cov kuab tshuaj haum. Ib lub lint dawb, cov ntaub nqus dej yog thawj zaug wetted nrog cov kuab tshuaj thiab tom qab ntawd wiped hla ntawm cov ntoo. Qhov saum npoo tau tso cai kom qhuav thiab tom qab ntawd UV-kho tau txheej tuaj yeem siv tau. Kev tshem tawm cov roj saum npoo av thiab lwm yam khoom paug txhawb nqa tom qab adhesion ntawm daim ntawv thov txheej rau ntoo nto.

3. Hom stains zoo li cas nrog UV txheej?

Ib qho ntawm cov stains uas tau piav qhia ntawm no tuaj yeem raug kaw zoo thiab sab saum toj-coated nrog 100% UV-kho, hnyav-txo UV-kho tau, dej-UV-kho tau, lossis UV-kho cov hmoov txheej. Yog li ntawd, muaj ntau qhov kev sib txuas ua ke uas ua rau feem ntau cov stains hauv kev ua lag luam tsim nyog rau cov txheej txheem UV-kho tau. Txawm li cas los xij, muaj qee qhov kev txiav txim siab uas tseem ceeb kom paub tseeb tias muaj kev sib haum xeeb rau kev ua tiav ntoo zoo.

Waterborne Stains thiab Waterborne-UV-Curable Stains:Thaum ua ntawv thov 100% UV-kho tau, hnyav-txo UV-kho tau lossis UV-kho cov hmoov sealers / topcoats hla dej, nws yog qhov tseem ceeb uas cov stain yuav tsum qhuav kom tsis txhob muaj qhov tsis xws luag hauv txheej txheej, suav nrog txiv kab ntxwv tev, fisheyes, cratering. , pas dej da dej. Xws li qhov tsis xws luag tshwm sim vim qhov tsis tshua muaj qhov nro ntawm cov txheej txheej ntawm cov ntaub ntawv txheeb ze rau cov dej residual siab saum npoo nro los ntawm cov ntaub ntawv stain.

Daim ntawv thov txheej txheej dej-UV-kho tau, txawm li cas los xij, feem ntau yog kev zam txim ntau dua. Cov ntaub ntawv stain tuaj yeem pom qhov ntub dej yam tsis muaj teebmeem tshwm sim thaum siv qee yam dej-UV-kho tau sealers / topcoats. Residual noo noo lossis dej los ntawm daim ntawv thov stain yuav nkag tau yooj yim los ntawm kev siv dej-UV sealer / topcoat thaum lub sijhawm ziab. Txawm li cas los xij, nws tau hais kom muaj kev ntsuam xyuas txhua qhov stain thiab sealer / topcoat ua ke ntawm tus neeg sawv cev kuaj cov qauv ua ntej cog lus rau qhov tseeb saum npoo kom tiav.

Oil-based thiab Solvent-Borne Stains:Txawm hais tias tej zaum yuav muaj ib txoj hauv kev uas tuaj yeem siv rau cov roj uas tsis txaus los yog cov kuab tshuaj uas muaj kuab paug, feem ntau yog qhov tsim nyog, thiab pom zoo, kom qhuav cov stains ua ntej siv cov sealer / topcoat. Kev ziab qeeb qeeb ntawm cov hom no yuav xav tau txog li 24 mus rau 48 teev (lossis ntev dua) kom ua tiav qhov ziab tag. Ib zaug ntxiv, kev ntsuam xyuas qhov system ntawm tus sawv cev ntoo saum npoo yog qhia.

100% UV-Curable Stains:Feem ntau, 100% UV-kho coatings muaj tshuaj lom neeg thiab dej tsis kam thaum kho tag nrho. Qhov kev tiv thaiv no ua rau nws nyuaj rau tom qab siv cov txheej txheem kom ua raws li qhov zoo tshwj tsis yog tias lub hauv paus UV-kho qhov chaw yog txaus abraded kom tso cai rau txhua yam kev sib raug zoo. Txawm hais tias 100% UV-kho tau stains uas tau tsim los ua kom tau txais cov txheej txheem tom qab siv, feem ntau 100% UV-kho tau stains yuav tsum tau abraded los yog kho ib nrab (lub sij hawm "B" theem los yog pob curing) los txhawb intercoat adhesion. "B" staging tshwm sim nyob rau hauv residual reactive qhov chaw nyob rau hauv lub stain txheej uas yuav co-react nrog cov ntaub ntawv UV-kho tau txheej raws li nws yog raug rau tag nrho cov kev kho mob. "B" staging kuj tso cai rau me me abrading rau denib los yog txiav cov qoob loo uas yuav tshwm sim los ntawm daim ntawv thov stain. Smooth foob los yog topcoat daim ntawv thov yuav ua tau zoo heev intercoat adhesion.

Lwm qhov kev txhawj xeeb nrog 100% UV-kho tau stains cuam tshuam rau cov xim tsaus. Cov xim pigmented hnyav heev (thiab cov xim pleev xim feem ntau) ua tau zoo dua thaum siv UV teeb uas xa lub zog los ze zog rau lub teeb pom kev zoo. Pa UV teeb doped nrog gallium ua ke nrog cov qauv mercury teeb yog ib qho kev xaiv zoo heev. UV LED teeb uas tawm 395 nm thiab / lossis 405 nm ua tau zoo dua nrog cov xim pigmented txheeb ze rau 365 nm thiab 385 nm arrays. Tsis tas li ntawd, UV teeb tshuab uas xa cov hluav taws xob ntau dua (mW / cm²) thiab zog ceev (mJ/cm²) txhawb kev kho kom zoo dua los ntawm kev siv cov stain lossis pigmented txheej txheej.

Thaum kawg, raws li nrog rau lwm yam stain systems tau hais los saum no, kev ntsuam xyuas yog qhia ua ntej ua hauj lwm nrog rau qhov tseeb nto yuav stained thiab tiav. Nco ntsoov ua ntej kho!

4. Dab tsi yog qhov siab tshaj plaws / tsawg kawg nkaus tsim rau 100% UV txheej?

UV-curable hmoov txheej technically yog 100% UV-kho coatings, thiab lawv cov thickness yog txwv los ntawm electrostatic zog ntawm attraction uas khi cov hmoov rau saum npoo tiav. Nws yog qhov zoo tshaj los nrhiav cov lus qhia ntawm UV hmoov coatings chaw tsim tshuaj paus.

Hais txog cov kua 100% UV-kho tau cov txheej txheem, cov ntaub ntawv ntub cov yeeb yaj kiab yuav ua rau kwv yees li qub cov yeeb yaj kiab qhuav tuab tom qab UV kho. Qee qhov shrinkage yog inevitable tab sis feem ntau nws yog qhov tsim nyog tsawg. Muaj, txawm li cas los xij, cov ntawv thov kev tshaj lij uas qhia meej nruj heev lossis nqaim zaj duab xis thickness kam rau ua. Nyob rau hauv cov xwm txheej no, kev ntsuas cov yeeb yaj kiab ncaj qha tuaj yeem ua tau los cuam tshuam cov duab ntub dej kom qhuav.

Qhov kawg kho tuab tuab uas tuaj yeem ua tiav yuav nyob ntawm kev siv tshuaj ntawm UV-kho tau txheej thiab yuav ua li cas nws tau tsim. Muaj cov tshuab muaj uas tau tsim los muab cov yeeb yaj kiab nyias nyias ntawm 0.2 mil - 0.5 mil (5µ - 15µ) thiab lwm yam uas tuaj yeem muab cov thickness ntau tshaj 0.5 ntiv tes (12 hli). Feem ntau, UV-kho coatings uas muaj qhov sib txuas siab sib txuas, xws li qee cov urethane acrylate formulations, tsis muaj peev xwm ntawm cov yeeb yaj kiab siab tuab hauv ib txheej txheej. Lub degree ntawm shrinkage raws li kev kho yuav ua rau hnyav tawg ntawm lub thicknessly thov txheej. Kev tsim siab lossis ua tiav cov tuab tseem tuaj yeem ua tiav siv UV-kho tau cov txheej txheem ntawm kev sib txuas siab sib txuas los ntawm kev siv ntau txheej nyias thiab sanding thiab / lossis "B" staging ntawm txhua txheej los txhawb kev sib cuam tshuam.

Lub reactive curing mechanism ntawm feem ntau UV-kho coatings yog hu ua "dawb radical pib." Qhov no reactive curing mechanism yog susceptible rau oxygen nyob rau hauv cov huab cua uas slows los yog inhibits qhov ceev ntawm kev kho. Qhov kev qeeb qeeb no feem ntau hu ua oxygen inhibition thiab yog qhov tseem ceeb tshaj plaws thaum sim ua kom tiav cov yeeb yaj kiab nyias nyias. Hauv cov yeeb yaj kiab nyias, thaj chaw saum npoo mus rau tag nrho cov ntim ntawm cov ntawv thov txheej yog siab heev thaum piv rau cov yeeb yaj kiab tuab tuab. Yog li ntawd, nyias zaj duab xis thicknesses muaj ntau yam raug rau oxygen inhibition thiab kho tau qeeb heev. Feem ntau, qhov saum npoo ntawm qhov kawg tseem kho tsis txaus thiab ua rau muaj kev xav oily/greasy. Txhawm rau tiv thaiv cov pa oxygen inhibition, cov pa roj tsis zoo xws li nitrogen thiab carbon dioxide tuaj yeem hla dhau ntawm qhov chaw thaum kho kom tshem tawm cov concentration ntawm oxygen, yog li tso cai tag nrho, kho sai.

5. Qhov tseeb UV txheej yog dab tsi?

100% UV-kho tau cov txheej txheem tuaj yeem ua kom pom tseeb meej thiab yuav sib tw cov tsho loj tshaj plaws hauv kev lag luam. Tsis tas li ntawd, thaum siv rau ntoo, lawv nqa tawm qhov siab tshaj plaws kev zoo nkauj thiab qhov tob ntawm cov duab. Ntawm qhov kev txaus siab yog ntau yam aliphatic urethane acrylate systems uas zoo kawg nkaus meej thiab tsis muaj xim thaum siv rau ntau qhov chaw, suav nrog ntoo. Tsis tas li ntawd, aliphatic polyurethane acrylate coatings yog ruaj khov thiab tiv taus cov xim nrog lub hnub nyoog. Nws yog ib qho tseem ceeb uas yuav tau taw qhia tias cov coatings uas tsis tshua muaj hluav taws xob tawg ntau dua li cov xim gloss thiab yog li yuav muaj qhov pom tseeb qis dua. Kev txheeb ze rau lwm cov txheej txheem tshuaj, txawm li cas los xij, 100% UV-curable txheej yog sib npaug yog tias tsis zoo dua.

Waterborne-UV-curable coatings muaj nyob rau lub sij hawm no tuaj yeem tsim los muab qhov tshwj xeeb meej, qhov sov sov thiab cov lus teb rau kev sib tw rau qhov zoo tshaj plaws kev ua tiav tshuab. Clarity, gloss, ntoo teb thiab lwm yam kev ua haujlwm ntawm UV-kho coatings muaj nyob rau hauv kev ua lag luam niaj hnub no zoo heev thaum tau los ntawm cov tuam txhab zoo.

6. Puas muaj xim lossis xim xim UV-kho tau?

Yog lawm, cov xim pleev xim lossis cov xim pleev xim tau yooj yim muaj nyob rau hauv txhua hom UV-kho tau cov txheej txheem tab sis muaj ntau yam los xav txog qhov zoo tshaj plaws. Thawj thiab qhov tseem ceeb tshaj plaws yog qhov tseeb tias qee cov xim cuam tshuam nrog lub peev xwm ntawm UV lub zog xa mus rau, lossis nkag mus, siv UV-kho tau txheej. Lub electromagnetic spectrum yog illustrated nyob rau hauv daim duab 1, thiab nws yuav pom tau hais tias lub teeb pom kev zoo spectrum yog tam sim ntawd nyob ib sab ntawm lub UV spectrum. Lub spectrum yog ib qho txuas ntxiv uas tsis muaj cov kab meej (wavelengths) ntawm demarcation. Yog li ntawd, ib cheeb tsam maj mam sib xyaw rau hauv ib cheeb tsam uas nyob ib sab. Xav txog qhov pom lub teeb pom kev zoo, muaj qee qhov kev tshawb fawb hais tias nws kis tau los ntawm 400 nm txog 780 nm, thaum lwm qhov kev thov hais tias nws ncua ntawm 350 nm txog 800 nm. Rau qhov kev sib tham no, nws tsuas yog qhov tseem ceeb uas peb paub tias qee cov xim tuaj yeem thaiv kev sib kis ntawm qee qhov wavelengths ntawm UV lossis hluav taws xob.

Txij li kev tsom mus rau thaj tsam UV wavelength lossis hluav taws xob, cia peb tshawb xyuas thaj tsam ntawd kom ntxaws dua. Duab 2 qhia txog kev sib raug zoo ntawm lub wavelength ntawm pom lub teeb thiab cov xim sib xws uas muaj txiaj ntsig zoo hauv kev thaiv nws. Nws tseem yog ib qho tseem ceeb kom paub tias cov xim pleev xim feem ntau nthuav dav ntau qhov ntev xws li cov xim liab tuaj yeem nthuav dav ntau yam xws li nws tuaj yeem nqus tau rau hauv cheeb tsam UVA. Yog li ntawd, cov xim ntawm qhov kev txhawj xeeb loj tshaj plaws yuav ua rau daj - txiv kab ntxwv - liab ntau yam thiab cov xim no tuaj yeem cuam tshuam nrog kev kho kom zoo.

Tsis tsuas yog cov tshuaj pleev xim cuam tshuam nrog UV kho, lawv kuj yog ib qho kev txiav txim siab thaum siv cov xim xim dawb, xws li UV-kho tau primers thiab pleev xim rau sab saum toj. Xav txog qhov absorbance spectrum ntawm cov xim dawb titanium dioxide (TiO2), raws li qhia hauv daim duab 3. TiO2 nthuav tawm muaj zog absorbance thoob plaws hauv cheeb tsam UV thiab tseem, cov xim dawb, UV-kho tau zoo kho tau zoo. Yuav ua li cas? Cov lus teb nyob hauv kev ua tib zoo tsim los ntawm cov txheej txheem tsim tawm thiab cov chaw tsim khoom hauv kev hais kwv txhiaj nrog kev siv cov teeb pom kev zoo UV rau kev kho. Cov teeb pom kev zoo, cov teeb pom kev UV hauv kev siv emit zog raws li pom hauv duab 4.

Txhua lub teeb duab qhia yog ua raws li cov mercury, tab sis los ntawm doping cov mercury nrog rau lwm cov khoom siv hlau, cov emission tuaj yeem hloov mus rau lwm thaj chaw wavelength. Nyob rau hauv rooj plaub ntawm TiO2-raws li, dawb, UV-kho coatings, lub zog xa los ntawm tus qauv mercury teeb yuav raug thaiv zoo. Qee qhov ntau dua wavelengths xa tuaj yeem muab kev kho mob tab sis ntev npaum li cas yuav tsum tau kho tag nrho yuav tsis ua tau. Los ntawm doping lub teeb mercury nrog gallium, txawm li cas los xij, muaj ntau lub zog uas muaj txiaj ntsig zoo hauv thaj av uas tsis zoo los ntawm TiO2. Siv kev sib xyaw ua ke ntawm ob hom teeb, ob qho tib si los ntawm kev kho mob (siv gallium doped) thiab kho qhov chaw (siv tus qauv mercury) tuaj yeem ua tiav (Duab 5).

Thaum kawg, cov xim pleev xim lossis xim xim UV-kho tau cov txheej txheem yuav tsum tau tsim los ntawm kev siv cov duab zoo tshaj plaws kom lub zog UV - pom lub teeb lub teeb pom kev tau xa los ntawm cov teeb - yog siv kom zoo rau kev kho kom zoo.

Lwm cov lus nug?

Hais txog cov lus nug uas tshwm sim, tsis txhob yig mus nug lub tuam txhab tam sim no lossis yav tom ntej tus neeg xa khoom ntawm cov txheej txheem, cov khoom siv thiab cov txheej txheem tswj cov txheej txheem. Cov lus teb zoo muaj los pab txiav txim siab zoo, nyab xeeb thiab muaj txiaj ntsig. u

Lawrence (Larry) Van Iseghem yog tus thawj tswj hwm / CEO ntawm Van Technologies, Inc. Van Technologies muaj ntau tshaj 30 xyoo ntawm kev paub nyob rau hauv UV-curable coatings, pib raws li ib tug R & D lub tuam txhab tab sis hloov sai sai rau hauv ib lub chaw tsim tshuaj paus ntawm Application Specific Advanced Coatings ™ pab muaj txheej txheem. cov chaw thoob ntiaj teb. UV-curable coatings yeej ib txwm yog lub hom phiaj tseem ceeb, nrog rau lwm yam "Green" txheej thev naus laus zis, nrog rau qhov tseem ceeb ntawm kev ua tau zoo sib npaug lossis tshaj cov thev naus laus zis. Van Technologies tsim lub GreenLight Coatings ™ hom kev lag luam txheej txheej raws li ISO-9001: 2015 muaj ntawv pov thawj kev tswj hwm zoo. Yog xav paub ntxiv, mus saibwww.greenlightcoatings.com.