Xyoo 2024 yog lub sijhawm tseem ceeb rau kev lag luam photovoltaic (PV) vim tias kev sib tw hnyav ua rau muaj kev nce qib sai hauv kev siv tshuab cell thiab kev siv hauv kev lag luam, ntau dua li kaum xyoo dhau los. Txawm hais tias muaj cov kev hloov tshiab no, kev xaiv cov zaj duab xis encapsulation - txawm tias POE (polyolefin elastomer), EVA (ethylene-vinyl acetate copolymer), lossis EPE - tseem yog ib qho tseem ceeb thiab sib cav dav dav rau ob qho tib si iav-iav, daim ntawv iav-rov qab, thiab cov modules hloov pauv tau.
Cov PV modules sab nraum zoov ntsib kev puas tsuaj los ntawm plaub yam tseem ceeb ntawm ib puag ncig: cua sov, oxygen, dej, thiab ultraviolet (UV). Txawm hais tias kev ua haujlwm ntawm cov kab mob tsis tseem ceeb hauv cov ntawv thov no, lwm yam tseem ceeb ua lub luag haujlwm tseem ceeb hauv kev xaiv cov khoom siv. Tsab xov xwm no piv rau kev ua tau zoo ntawm EVA thiab POE nyob rau hauv cov xwm txheej no, muab cov kev nkag siab tshiab thiab cov txheej txheem rau kev xaiv cov khoom siv.
1. Kub
Ob leeg EVA thiab POE, thaum sib txuas ua ke, tuaj yeem tiv taus qhov kub thiab txias luv luv li ntawm 150 ° C. Txawm li cas los xij, EVA lwj thaum kub tshaj 200 ° C, tso tawm ntau cov acetic acid, thaum POE tseem ruaj khov kom txog thaum kub tshaj 300 ° C.
2. Cov pa oxygen
Thaum sov li chav tsev, ob qho khoom siv no ua rau muaj kev tiv thaiv zoo rau kev oxidation. Txawm li cas los xij, EVA muaj cov tshuaj acetic acid monomers dawb me ntsis, uas yooj yim oxidation ntawm qhov kub siab. Qhov sib piv, POE, uas muaj cov pa roj carbon-hydrogen sib txuas ruaj khov, xav tau qhov kub siab dua kom cuam tshuam nrog oxygen.
3. Dej
Cov pawg ester ntawm EVA yooj yim rau hydrolysis, ua rau muaj cov pawg carboxyl uas ua rau hydrolysis thiab cov khoom puas tsuaj sai dua. POE, nrog nws cov saw hlau carbon-hydrogen tag nrho, ruaj khov hauv tshuaj lom neeg thiab tsis cuam tshuam los ntawm hydrolysis. Tsis tas li ntawd, POE ua rau pom kev tiv thaiv dej zoo dua, nrog rau tus nqi kis dej (WVTR) kwv yees li 3 g / m2 · 24 teev ntawm 38 ° C thiab 90% qhov av noo, piv rau EVA's WVTR ntawm 25 g / m2 · 24 teev. Qhov permeability qis dua no ua rau POE muaj peev xwm tiv thaiv cov khoom sab hauv ntawm cov khoom siv los ntawm kev puas tsuaj los ntawm dej noo.
4. Kev Tawm Hluav Taws Xob Ultraviolet
POE cov qauv saw hlau uas muaj cov pa roj carbon-hydrogen muaj cov tshuaj sib txuas zoo heev—CH cov sib txuas ntawm 414 kJ/mol thiab CC cov sib txuas ntawm 332 kJ/mol—ua rau lawv tiv taus UV-induced cleavage. Ntawm qhov tod tes, EVA cov pawg ester muaj cov sib txuas CO nrog cov zog sib txuas qis dua 330 kJ/mol, uas yooj yim rau UV degradation.
Xaus lus
Ntawm plaub yam tseem ceeb uas cuam tshuam rau kev siv sab nraum zoov - cua sov, oxygen, dej, thiab UV - POE yeej ua tau zoo dua EVA. Thaum cov cell PV ua haujlwm tau zoo dua thiab xav tau kev ntseeg siab dua, POE tseem yog qhov kev xaiv zoo tshaj plaws rau kev ua kom muaj zog ntev thiab ruaj khov hauv cov chaw sab nraum zoov.
