Vim li cas lub PC npog ntawm UV- LED teeb tig dawb tom qab siv sijhawm?
1. Kev Taw Qhia: Ib qho kev pom dav dav ntawm kev lag luam qhov mob
Yog tias koj siv UV-LED curing teeb, teeb pom kev zoo, lossis cov khoom siv tiv thaiv UV, tej zaum koj yuav tau ntsib qhov teeb meem no: lub teeb ua haujlwm zoo kawg nkaus thaum tshiab, nrog qhov pom tseeb thiab tso zis ntau. Tab sis tom qab ob peb lub lis piam mus rau lub hlis, lub pob tshab PC (polycarbonate) npog maj mam tig dawb thiab tsaus muag, kev xa tawm poob qis, thiab kev kho kom zoo poob qis.
Qhov no tsis yog qhov tsis zoo los ntawm ib tus neeg tsim khoom, tab sis ib qhokev coj tus cwj pwm hauv chemicalntawm PC khoom nyob rau hauv UV hluav taws xob - ib tug irreversible txheej txheem hu uaduab-oxidative degradation. Kev nkag siab txog kev tshawb fawb tom qab qhov tshwm sim no yog qhov tseem ceeb rau kev xaiv cov khoom siv, kev ua kom zoo ntawm cov khoom siv, thiab kev tswj tus nqi. Kab lus no tau tshuaj xyuas cov txheej txheem molecular ntawm kev ntxuav hniav dawb hauv UV-LED teeb PC npog, pab cov neeg siv khoom paub ntau ntxiv txog kev txiav txim siab yuav khoom siv cov ntaub ntawv ntxaws sib piv.
2. Core mechanism: Yuav ua li cas yees duab-oxidation "noj" koj lub teeb npog
2.1 Molecular- theem degradation txheej txheem
PC (polycarbonate) thiab feem ntau lwm yam polymers yogtsis yog UV ruaj khov. Lub siab-zog photons tawm los ntawm UV- LED teeb (tshwj xeeb tshaj yog nyob rau hauv 365–405 nm UVA band) muaj lub zog txaus los rhuav tshem C-C, C-H, thiab C-O tshuaj bonds nyob rau hauv cov saw hlau polymer, ua rau cov saw hlau ntawm degradation.
Cov txheej txheem tshwm sim nyob rau hauv peb kauj ruam:
- Kauj Ruam 1 - Daim Ntawv Pov Thawj:UV photon zog ncaj qha rhuav tshem cov pob txha polymer, tsim cov dawb radicals ntau.
- Kauj Ruam 2 - Kev tsim dawb radical:Highly reactive radical qhov chaw tsim ntawm qhov kawg ntawm cov chains tawg.
- Kauj Ruam 3 – Yees duab-oxidation:Cov radicals no sai sai nrog cov pa oxygen hauv huab cua, tsim cov tshuaj tshiab xws li carbonyls, peroxides, thiab hydroxyl pawg, uas ua rau cov teeb meem tawg.
2.2 Vim li cas "dawb" tsis yog "daj"?
Cov ntaub ntawv PC tsoos feem ntau tig daj nyob rau hauv kev raug UV ntev ntev, tab sis qhov tshwm sim ntawm cov xim dawb ntawm UV-LED teeb npog muaj qhov sib txawv. Cov txheej txheem degradation ua rau micro- tawg, ib txheej txheej embrittlement, thiab nano- nplai voids - tag nrho cov uas ualub teeb tawg chaw. Lub teeb tawg ntawm cov teeb meem microscopic no, muab lub hau npog ib qho opaque milky dawb los yog daj ntseg tsos.
Qee cov neeg siv khoom tshaj tawm pom pom kev ua kom dawb tom qab siv ob lub lis piam xwb. Qhov no yog qhov tseeb vim yog cov khoom siv npog tsis txaus UV stabilizers lossis tiv thaiv -UV txheej.
3. Yam tseem ceeb cuam tshuam rau tus nqi degradation
| Qhov xwm txheej | Mechanism | Cov ntaub ntawv kev lag luam / tus nqi raug |
|---|---|---|
| UV wavelength | Luv luv wavelength=siab zog=sai degradation. UVC/UVB rhuav tshem sai dua UVA, tab sis 395–405 nm UV-LED tseem ua rau qis qis dua | Peak wavelength 365-410 nm (ib JB / T 15202-2025 kev lag luam tus qauv) |
| Irradiance siv | Lub zog UV siab dua rau ib cheeb tsam hauv ib cheeb tsam ua kom nrawm nrawm ntawm daim ntawv cog lus | High-lub zog UV- LED tshuab tuaj yeem ncav cuag ntau W / cm² |
| Cov nyhuv thermal | Thaum tshav kub kub tsim thaum UV-LED ua haujlwm, thermal cycling accelerates polymer aging - synergy ntawm tshav kub thiab UV ua rau "thermal decay" nyhuv | Txhua txhua 10℃nce nyob rau hauv qhov kub thiab txias roughly doubles aging tus nqi |
| Khoom siv additives | PC cov khoom uas tsis muaj UV stabilizers, absorbers, los yog nto txheej degrades sai heev | Thawj kis ntawm PC zoo tib yam ≈89%, txawm tias qis dua rau PC tsis zoo |
| Humidity & contaminants | Cov dej noo thiab cov kuab paug ua rau cov duab nrawm dua -oxidation cov tshuaj tiv thaiv | Tus nqi degradation nyob rau hauv siab - cov av noo ib puag ncig ntau dua li qhov chaw qhuav |
4. Cov ntaub ntawv txhawb nqa: Tiag - ntiaj teb kev xa cov duab poob
4.1 Transmittance poob ntawm PC hauv qab UV laus
Raws li kev ntsuas kev lag luam, tom qab1500 teev ntawm UV aging, PC npog transmittance poob los ntawm qhov pib92% txog 80%- poob ntawm 12 feem pua cov ntsiab lus, ua rau muaj kev ceeb toom hloov. UV aging ua rau molecular saw scission, thickening ntawm nto oxidation / haze txheej, tsim ntawm micro- tawg, thiab lub teeb tawg.
4.2 Kev sib piv: UV-stabilized vs. non-UV- cov ntaub ntawv kho
| Hom khoom | Initial transmittance | Transmittance tom qab kev laus | Cov xwm txheej kuaj | Lus hais |
|---|---|---|---|---|
| Ordinary PC (tsis muaj UV stabilizer) | 89% | ~ 80% tom qab 1500h | UV aging test | 12% poob - yuav tsum tau hloov |
| UV-coated PC ntawv | >85% | Yellowing tus nqi tsuas yog 2, kev xa tawm poob 0.6% tom qab 4000h | Artificial weathering test | Tsuas yog 6% kev xa tawm poob ntau tshaj kaum xyoo |
| UV-qib fused silica (quartz) | >90% | Yuav luag tsis poob | Ntev - UV raug | Zoo tshaj UV tsis kam, tus nqi siab dua |
| Ordinary epoxy resin encapsulation | ~85% | 40% poob tom qab 3000h | Kev kuaj UV irradiation | Yooj yim yellows thiab hazes |
| Ordinary PPA cov ntaub ntawv | ~80% | 365nm transmittance poob 42% tom qab 2000h ntawm 50 degree | 50℃ib puag ncig | Curing efficiency poob 35% hauv peb lub hlis |
4.3 UV tiv thaiv qeb ntawm cov ntaub ntawv encapsulation
Rau UV-LED encapsulation cov ntaub ntawv:fused silica (quartz)muaj qhov siab tshaj UV transmittance, ua raws li silicone resin, nrog epoxy resin yog qhov phem tshaj. Vim nws zoo heev UV hluav taws xob tsis kam thiab thermal stability, quartz iav feem ntau yog siv los ua cov khoom siv lens. Polymer cov ntaub ntawv zoo li silicone roj hmab kuj raug cov saw scission nyob rau hauv ntev - lub sij hawm siab - siv UV raug, manifesting li lens nto haze thiab xim hloov los ntawm pob tshab mus rau daj los yog txawm charred dub.
5. Cov kev daws teeb meem: Tiv thaiv lub teeb npog kom dawb ntawm qhov chaw
5.1 Cov khoom siv qib
- Xaiv UV-stabilized PC:Ntxiv UV absorbers rau PC resin kom dissipate UV zog li tshav kub yam tsis muaj kev puas tsuaj molecular chains.
- Siv cov tshuaj tiv thaiv-UV txheej:Ib lub tsho tawv tawv organosilicon lossis UV- tiv taus acrylic sab saum toj txheej zoo txhim kho huab cua.
- Txhim kho rau quartz lossis borosilicate iav:Rau siab -lub zog UV tshuab, quartz iav yog qhov kev xaiv zoo tshaj plaws - tiv thaiv UV yellowing, tus nqi siab dua tab sis lub neej ua haujlwm ntev tshaj plaws.
- Siv UV co-extruded PC:UV co-extruded PC npog tuaj yeem tiv taus 3-5 xyoos ntawm kev laus sab nraum zoov.
5.2 Tsim thiab theem txheej txheem
- Optimize thermal tswj:Xyuas kom txaus cov cua sov dissipation kom txo tau cov nyhuv accelerating thermal stress ntawm polymer aging.
- Tsim nyog layout:Tuav kom raug tshem tawm ntawm lub hau thiab LEDs rau cov cua kub dissipation - zam kev sib cuag ncaj qha nrog qhov kub siab -.
- Kev tshuaj xyuas thiab hloov tsis tu ncua:Thaum lub hau npog tau tig dawb thiab npau taws, yooj yim polishing tsuas yog tshem tawm cov nplaim taws tab sis tsis tuaj yeem kho qhov kev puas tsuaj sib sib zog nqus - kev hloov ua tiav yog tib txoj kev daws teeb meem.
5.3 Kev lag luam tus qauv siv
Tuam Tshoj tau tshaj tawm cov kev qhia tshwj xeeb rau UV-LED curing devices -JB/T 15202-2025, muaj feem xyuam rau cov khoom siv nrog lub ncov UV wavelength ntawm365nm rau 410nm. Cov neeg siv khoom raug qhia kom xyuas seb cov khoom puas ua raws li tus qauv no thaum yuav khoom, xyuas kom cov khoom xaiv thiab cov txheej txheem tsim raws li kev cai.
6. Cov lus xaus
Kev ntxuav hniav dawb ntawm UV-LED teeb lub PC npog tsis yog "qhov teeb meem zoo" tab sis ib qhoinherent photochemical tebntawm cov ntaub ntawv polymeric rau UV hluav taws xob - qhov tseem ceeb ntawm cov yas version ntawm "sunburn." Los ntawm kev xaiv UV-cov ntaub ntawv ruaj khov, siv los tiv thaiv- UV txheej, ua kom zoo thermal tsim, lossis hloov kho rau quartz iav, qhov kev mob ntawm kev lag luam no tuaj yeem daws tau los ntawm kev daws teeb meem.
Rau cov ntawv thov kev lag luam uas xav tau lub neej ntev thiab kev ruaj ntseg siab, thaum yuav UV- cov khoom siv LED, tsom mus rau kev tiv thaiv -UV ntsuas ntawm cov khoom siv npog thiab cov qauv tsim thermal - es tsis yog qhov sib piv tsuas yog thawj lub teeb siv. Ib qho khoom siv uas tig mus rau hauv ob lub lis piam yuav zoo li yuav muaj ntau dua tag nrho cov nqi ntawm lub neej tshaj li cov khoom lag luam zoo dua nrog kev nqis peev ntau dua.
Yog tias koj muaj qee qhov kev xav tau rau kev yuav khoom ntau lossis kev kho UV-LED teeb pom kev zoo,thov tsis txhob yig tiv tauj peb kom paub meej cov lus hais.
