UV stabilizers tiv thaiv qhov chaw los ntawm kev txwv cov txheej txheem photodegradation. Hindered amine lub teeb stabilizers lossis HALS yog hom teeb pom kev zoo. Tsis zoo li UV absorbers, uas nqus UV lub teeb thiab tiv thaiv nws los ntawm kev ncav cuag cov yas, HALS muaj kev ua haujlwm tshwj xeeb nrog cov dawb radicals thiab tshuaj lom neeg.
Thaum lub teeb hits saum npoo, nws xa lub zog rau cov atoms hauv cov yas. Cov atoms nqus lub zog, ua rau lawv cov khoom muaj zog txaus siab. UV teeb kuj ua rau HALS tsim cov nitrogen oxides. Cov tshuaj no absorbs alkyl radicals generated los ntawm atomic hais zoo siab. Cov pab pawg alkyl hnov mob nrog nitrogen oxides los tsim cov amino ethers. Cov ethers no ces pom peroxy radicals hauv cov khoom. Amino ether rhuav tshem peroxy radicals thiab cov khoom siv tshuaj tiv thaiv rov tsim dua HALS nitrogen oxides. Yog tias cov alkyl thiab peroxy radicals tsis yog neutralized, cov khoom yuav raug oxidation puas.
Hauv cov lus layman, HALS ua haujlwm los ntawm kev tsim cov khoom uas nrhiav thiab "noj" cov dawb radicals tso tawm los ntawm cov khoom siv. Yog tias tsis muaj cov dawb radicals, cov khoom siv tsis hnav vim photo-oxidation. Tom qab noj cov dawb radicals, cov khoom tsim tawm tsim cov khoom xyaw uas HALS yuav tsum tau ua haujlwm dua. Los ntawm kev rov tsim dua tshiab, cov teeb ci stabilizers thaiv UV puas suav tsis txheeb lub sijhawm, ua kom lawv cov txiaj ntsig ntev.
Vim hais tias cov teeb stabilizers yog tus kheej-regenerating, ntxiv rau ncua lawv cov efficiency, lawv kuj muaj lub neej ntev heev. Nrog rau qhov sib ntxiv ntawm HALS, cov nyom dag tuaj yeem nyob kaj thiab ntsuab rau ib xyoo caum lossis ntau dua. Txawm tias tsis tshua muaj siab ntawm cov teeb ci stabilizers tau ua pov thawj zoo hauv kev tiv thaiv cov ntaub ntawv los ntawm photodegradation thiab thermal abrasion.
Txawm li cas los xij, HALS muaj kev txwv. Cov stabilizers lub teeb no tsis haum rau cov halogen uas muaj cov polymers xws li PVC. Kev sib xyaw ua ke nrog lwm cov khoom siv ntxiv xws li UV absorbers tuaj yeem pab txhim kho kev ua haujlwm ntawm HALS hauv polymers, tab sis lawv siv tsis zoo.
