UV stabilizer txhais li cas?
UV stabilizers yog cov khoom siv los tiv thaiv cov txheej txheem tshuaj hu ua "photodegradation," uas tshwm sim thaum hluav taws xob ultraviolet los ntawm cov khoom siv hluav taws xob los yog lub hnub tawg cov tshuaj tiv thaiv hauv cov polymers.
Los ntawm kev siv cov stabilizers, cov tsos mob ntawm lub cev puas tsuaj los yog corrosion tuaj yeem zam, suav nrog:
pulverized
tawg
Xim hloov
UV Stabilizers piav qhia
UV stabilizers feem ntau ua haujlwm los ntawm kev nqus hluav taws xob los ntawm UV rays thiab tom qab ntawd dissipating lub zog raws li cov cua sov qis.
Ntau cov khoom siv hluavtaws thiab ntuj tsim tau tuaj yeem tawm tsam los ntawm UV hluav taws xob. Yog li ntawd, cov khoom los yog cov khoom ua los ntawm cov polymers yuav decompose, tawg, los yog puas yog tias lawv tsis UV stabilized. Kev puas tsuaj yog cuam tshuam nrog UV teeb thiab pom tau zoo heev hauv cov ntaub ntawv thiab cov khoom siv raug tshav ntuj. Kev raug UV txuas ntxiv tuaj yeem ua teeb meem loj, vim kev puas tsuaj nyob ntawm qhov raug.
Nyob rau hauv cov ntaub ntawv no, cov polymers raug tawm tsam, uas tej zaum yuav muaj xws li polypropylene, xws li muaj hlua. Cov kab hluav taws xob ultraviolet hnov mob nrog cov ntawv cog lus los tsim cov dawb radicals, uas txuas ntxiv nrog cov pa oxygen hauv ib puag ncig los tsim cov saw hlau carbonyl. Thaum qhov no tshwm sim, qhov chaw raug ntawm cov khoom tuaj yeem tawg, tawg, thiab qee zaum raug puas tsuaj tag. Lwm cov piv txwv ntawm cov polymers uas muaj kev cuam tshuam rau UV hluav taws xob xws li Kevlar lossis Aramid fibers.
Cov teeb meem cuam tshuam nrog UV degradation tuaj yeem kuaj pom los ntawm infrared spectroscopy. Thaum pom muaj teeb meem, kev tiv thaiv tsim nyog yuav tsum tau siv ua ntej kev puas tsuaj loj tshwm sim. Qhov no yog qhov uas UV stabilizers tuaj rau hauv kev ua si. Cov stabilizers no tuaj yeem siv los tiv thaiv UV tawm tsam los ntawm kev ntxiv tshuaj los tiv thaiv UV rays. Lawv muab sib xyaw rau hauv cov khoom siv polymer ua ntej kawg shaping lossis molding.
