Hauv ntiaj teb cov khoom siv hluav taws xob, cov ntaub ntawv yas ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov khoom rhiab ntawm ib puag ncig xws li ya raws, plua plav, thiab kev cuam tshuam lub cev. Txawm li cas los xij, ib qho teeb meem uas tau muaj kev txhawj xeeb loj zuj zus rau cov tuam ntxhab thiab cov kws tsim khoom yog qhov kev puas tsuaj ntawmyas enclosuresvim raug ultraviolet (UV) hluav taws xob. Sij hawm dhau mus, ntau lub hnab yas, nrog rau cov khoom siv hluav taws xob yas, ua kom tsis muaj xim, nkig, lossis tsis muaj zog, cuam tshuam lawv txoj haujlwm tiv thaiv. Qhov no yog qhov tshwj xeeb tshaj yog rau cov ntaub thaiv npog rau cov khoom siv hluav taws xob uas siv rau sab nraum zoov lossis siab - ib puag ncig UV.
Vim li cas Plastic Enclosures tig daj los yog brittle?
Cov ntaub ntawv yas yog tsim los ntawm ntau yam ntaub ntawv, feem ntau yog acrylonitrile butadiene styrene (ABS), polycarbonate (PC), thiab polyethylene (PE). Txawm hais tias cov ntaub ntawv no ruaj khov thiab raug nqi - siv tau, lawv tsis tiv thaiv ib puag ncig hnav thiab tsim kua muag, tshwj xeeb tshaj yog thaum raug UV hluav taws xob los ntawm lub hnub.
UV Radiation thiab yas degradation
Thaum cov ntaub ntawv yas raug UV teeb, cov saw hlau polymer uas tsim cov khoom yas tuaj yeem tawg. Cov txheej txheem no, hu ua photodegradation, ua rau cov khoom tsis muaj zog, poob nws cov qauv kev ncaj ncees, thiab hloov nws cov xim. Cov nyhuv yellowing feem ntau yog vim qhov tawg ntawm cov yas cov tshuaj lom neeg cov qauv, uas ua rau tsim cov khoom oxidation uas nqus lub teeb sib txawv. Qhov no yog vim li cas cov ntaub ntawv yas uas ib zaug pom meej lossis dawb tuaj yeem tsim cov xim daj daj thaum raug lub hnub rau lub sijhawm ntev.
Tsis tas li ntawd, UV hluav taws xob ua rau txo qhov hnyav molecular ntawm cov yas, uas ua rau poob ntawm lub zog thiab yoog raws. Qhov no ua rau cov ntaub thaiv npog yooj yim dua rau kev tawg lossis ua nkig, tshwj xeeb tshaj yog nyob rau hauv huab cua kub. Raws li qhov tshwm sim, tsis tsuas yog cov tsos ntawm lub kaw lus degrade, tab sis nws cov khoom tiv thaiv kuj txo qis, ua rau muaj kev pheej hmoo rau cov khoom siv hluav taws xob hauv.
Cov teeb meem tshwm sim los ntawm Electronics Manufacturers
Rau cov tuam ntxhab ntawm cov khoom siv hluav taws xob, qhov cuam tshuam ntawm UV- ntxias cov yas degradation yog ib qho kev txhawj xeeb loj. Nws tuaj yeem ua rau tus nqi siab dua rau kev saib xyuas, kho, lossis hloov cov ntaub ntawv tsis raug. Tsis tas li ntawd, cov neeg siv khoom tuaj yeem pom cov ntaub ntawv daj lossis nkig ua ib qho cim ntawm cov khoom tsis zoo, uas tuaj yeem ua rau lub npe nrov.
Piv txwv li, cov khoom siv hluav taws xob yas siv rau sab nraum zoov, xws li cov khoom siv sib txuas lus, hnub ci- cov khoom siv hluav taws xob, lossis cov teeb pom kev zoo, muaj kev pheej hmoo siab ntawm UV degradation. Txawm tias cov ntaub thaiv npog rau cov khoom siv hluav taws xob siv hauv tsheb lossis cov chaw hauv hiav txwv tau raug UV hluav taws xob, uas ua rau cov txheej txheem degradation.
Txhawm rau tiv thaiv cov teeb meem zoo li no, nws yog ib qho tseem ceeb uas yuav tau xaiv cov ntaub ntawv tsim nyog rau daim ntawv thov.
Xaiv UV-Cov khoom siv tiv thaiv rau cov ntaub ntawv yas
Txhawm rau tiv thaiv UV degradation, cov tuam txhab tsim khoom yuav tsum xaiv UV- cov ntaub ntawv tiv thaiv uas tuaj yeem tiv taus lub hnub ntev ntev yam tsis poob lawv cov qauv kev ntseeg siab lossis zoo nkauj. Nov yog qee cov ntaub ntawv uas feem ntau siv rau UV-cov ntaub ntawv yas tiv thaiv:
1. ABS yas
ABS yas yog ib qho ntawm cov khoom siv dav siv los ua cov ntaub ntawv yas, suav nrogABS yas hlws ris thawv. Txawm li cas los xij, ABS ib txwm ua tsis tau zoo nyob rau hauv kev raug UV ntev. Nyob rau tib lub sijhawm, nws zoo li tsis muaj xim thiab nkig thaum raug tshav ntuj. Txhawm rau hais txog qhov no, cov tuam txhab tsim khoom tau tsim UV- cov qib tiv taus ntawm ABS los ntawm kev sib xyaw cov khoom ntxiv thiab cov stabilizers uas txhim kho nws txoj kev tiv thaiv UV degradation.
UV- tiv thaiv ABS cov ntaub ntawv khaws lawv cov xim thiab cov khoom siv kho tshuab ntev dua li tus qauv ABS. Cov ntaub ntawv no feem ntau siv rau hauv kev lag luam xws li hluav taws xob, tsheb, thiab kev sib txuas lus, qhov kev ua tau zoo thiab kev zoo nkauj yog qhov tseem ceeb.
2. Polycarbonate (PC)
Polycarbonate yog lwm cov khoom siv paub txog nws cov kev tiv thaiv UV zoo heev. Nws feem ntau yog siv rau cov ntaub thaiv npog uas xav tau kev tiv thaiv siab thiab pob tshab. Thaum polycarbonate tuaj yeem daj dhau lub sijhawm, cov tuam txhab tuaj yeem txhim kho nws txoj kev ruaj ntseg UV los ntawm kev koom nrog UV inhibitors lossis txheej txheej. Polycarbonate enclosures feem ntau yog siv rau sab nraum zoov, xws li teeb pom kev, lub koob yees duab kev ruaj ntseg, thiab lwm yam khoom siv raug tshav ntuj.
Qhov sib ntxiv ntawm UV stabilizers lossis coatings rau polycarbonate tuaj yeem txuas ntxiv nws txoj sia, tiv thaiv yellowing thiab tswj nws qhov pom tseeb. Txawm li cas los xij, polycarbonate nyiam kim dua li ABS, yog li cov tuam txhab lag luam yuav tsum xav txog cov kev xav tau tshwj xeeb ntawm lawv daim ntawv thov.
3. Polypropylene (PP)
Polypropylene paub txog nws cov tshuaj tiv thaiv zoo heev thiab kev nqus dej tsawg, tab sis nws qhov kev ua tau zoo nyob rau hauv UV raug tuaj yeem ua rau tsis zoo yam tsis muaj tshuaj ntxiv. UV-cov qib tiv thaiv ntawm polypropylene muaj, uas pab tswj nws cov khoom thiab tiv thaiv cov khoom los ntawm nkig lossis tsis muaj xim.
Polypropylene enclosures feem ntau yog siv rau hauv kev lag luam tshuaj thiab khoom noj khoom haus, qhov uas raug rau cov tshuaj hnyav yog qhov kev txhawj xeeb ntau dua li UV hluav taws xob. Txawm li cas los xij, rau cov khoom siv hluav taws xob sab nraum zoov, lwm cov ntaub ntawv xws li ABS lossis polycarbonate tuaj yeem nyiam vim tias muaj kev tiv thaiv UV zoo dua.
4. UV-Resistant Coatings
Ntxiv rau kev xaiv UV- cov ntaub ntawv tiv taus, lwm lub tswv yim zoo yog siv UV- cov txheej tiv thaiv rau cov ntaub ntawv yas. Cov txheej no muab cov txheej txheem ntxiv ntawm kev tiv thaiv UV degradation. Cov txheej txheem xws li acrylic lossis polyurethane-raws li UV tiv thaiv tuaj yeem siv rau ntau yam ntaub ntawv yas, txhim kho lawv cov tawv nqaij daj thiab brittleness tshwm sim los ntawm UV raug.
Coated enclosures yog tshwj xeeb tshaj yog muaj txiaj ntsig nyob rau hauv rooj plaub uas cov khoom siv hauv paus tsis yog UV- tiv taus, tab sis tus nqi thiab cov khoom hloov pauv tseem ceeb heev. Qhov kev daws teeb meem no tso cai rau cov tuam txhab siv ntau yam ntawm cov yas thaum tseem ua tiav ntev - kev ua tau zoo nyob rau hauv ib puag ncig sab nraum zoov.
Kev txiav txim siab tseem ceeb thaum xaiv UV-Cov ntaub ntawv tiv taus
Thaum xaiv cov ntaub ntawv tsim nyog rau UV-cov ntaub ntawv yas tiv thaiv, cov tuam ntxhab yuav tsum coj mus rau hauv tus account ntau yam:
- Environmental Exposure: Nkag siab txog qib ntawm UV raug lub qhov rooj nkag yuav fim. Rau kev siv sab nraum zoov, xaiv cov khoom siv nrog UV tiv taus zoo dua, xws li UV- ruaj khov ABS lossis polycarbonate. Rau kev siv sab hauv tsev, kev xaiv cov khoom siv kuj tseem ceeb dua.
- Mechanical Strength: Xyuas kom cov khoom tuav nws lub zog thiab yoog raws lub sijhawm. UV degradation tuaj yeem ua rau cov ntaub thaiv yas tawg los yog ua rau tawg, yog li nws yog ib qho tseem ceeb uas yuav tsum xaiv cov ntaub ntawv uas tuaj yeem tiv taus cov neeg kho tshuab kev ntxhov siab rau lawv.
- Kev xav txog kev zoo nkauj: Rau cov ntawv thov uas zoo nkaus li tseem ceeb (xws li cov neeg siv khoom siv hluav taws xob), UV- cov ntaub ntawv tiv thaiv tuaj yeem tiv thaiv yellowing thiab ua kom huv si, zoo nkauj.
- Tus nqi vs. Durability: Thaum UV- cov ntaub ntawv tiv taus xws li polycarbonate tuaj yeem muab kev ua tau zoo dua, lawv kuj yuav kim dua. Xav txog qhov sib npaug ntawm tus nqi nrog rau qhov kev cia siab lifespan ntawm lub thawv.
- Additives thiab Coatings: Qee zaum, siv cov tshuaj tiv thaiv UV lossis cov txheej tiv thaiv kev tiv thaiv tej zaum yuav yog tus nqi -txoj kev zoo los txhim kho qhov kev ua tau zoo ntawm qhov thaiv yam tsis tau hloov mus rau cov khoom kim dua.
Xaus
Plastic enclosures yog ib feem tseem ceeb ntawm covelectronics kev lag luam, muab kev tiv thaiv ib puag ncig yam rau rhiab Cheebtsam. Txawm li cas los xij, raug rau UV hluav taws xob tuaj yeem ua rau muaj kev puas tsuaj loj, ua rau yellowing, brittleness, thiab txo kev ua haujlwm. Txhawm rau zam cov teeb meem no, cov tuam txhab lag luam yuav tsum xaiv UV- cov ntaub ntawv tiv thaiv xws li UV- ruaj khov ABS, polycarbonate nrog UV inhibitors, lossis polypropylene nrog ntxiv cov stabilizers.
Feem ntau, kev siv UV- cov tshuaj tiv thaiv kuj tseem tuaj yeem ua rau lub neej ntev ntawm cov ntaub ntawv yas, muab tus nqi - siv tau zoo. Los ntawm kev ua tib zoo xaiv cov khoom siv los yog kev kho mob rau daim ntawv thov, cov tuam txhab lag luam tuaj yeem ua kom lawv cov ntaub thaiv npog muaj kev tiv thaiv ntev thiab tswj lawv cov khoom zoo nyob rau lub sijhawm.
Siv:
- Kutz, M. (2020). "Plastics Engineering Phau Ntawv." Springer.Cov peev txheej no piav qhia yuav ua li cas ABS thiab lwm yam yas cuam tshuam los ntawm UV hluav taws xob thiab lub luag haujlwm ntawm cov khoom ntxiv hauv kev txhim kho UV tiv thaiv.
- MBB Tiwari, "Plastics for Electronics: Materials, Manufacturing, and applications." Elsevier, Kaum Ib Hlis 2021.Phau ntawv no muaj kev nkag siab txog cov txiaj ntsig thiab kev txwv ntawm polycarbonate rau cov khoom siv hluav taws xob sab nraum zoov.
