Lub teeb stabilizer yog ib qho ntxiv hauv cov khoom siv polymer xws li yas, roj hmab, coatings, thiab hluavtaws fibers. Nws lub luag haujlwm tseem ceeb nyob hauv kev cuam tshuam lossis nqus cov hluav taws xob ultraviolet (UV) hluav taws xob, ua kom tsis muaj pa oxygen, thiab rhuav tshem hydroperoxide rau hauv cov tebchaw tsis muaj zog. Qhov kev txiav txim no ua tau zoo los yog ncua sij hawm muaj peev xwm ua rau muaj teeb meem tshuaj lom neeg hauv cov polymers, yog li tiv thaiv lossis qeeb cov txheej txheem xws li photooxidation thiab txuas ntxiv lub neej tag nrho ntawm cov khoom polymer thaum raug lub teeb.,
Kev puas tsuaj ntawm ultraviolet hluav taws xob ntawm polymers:
Lub hnub ci lub teeb, uas muaj cov hluav taws xob hluav taws xob, ua rau pom thaum dhau los ntawm qhov chaw thiab txheej ozone. Yog li ntawd, cov hluav taws xob mus txog lub ntiaj teb nto ntog nyob rau hauv lub 290-3000 nm range. Lub teeb pom kev (400-800 nm) suav txog kwv yees li 40%, thaum lub teeb infrared (800-3000 nm) suav nrog txog 55%. Cov hluav taws xob ultraviolet, ncua 290-400 nm, tsuas yog 5% ntawm lub hnub ci tab sis nqa lub zog ntau heev. Kev nqus ntawm UV rays los ntawm cov khoom siv polymer ua rau nws tus kheej-oxidation thiab degradation, ua rau kev tawg ntawm cov tshuaj lom neeg, kev tawg, thiab kev sib txuas. Cov txheej txheem no ua rau pom kev hloov pauv ntawm cov xim, lub zog, thiab lub neej ntev, sib sau ua ke hu ua photoredox lossis photoaging.
Mechanism ntawm kev ua ntawm lub teeb stabilizers:
Lub teeb stabilizers nthuav tawm ntau cov qauv thiab kev ua haujlwm. Qee qhov yog tsim los tiv thaiv, xav txog, lossis nqus UV rays, hloov lawv mus rau qhov tsis muaj cua sov. Lwm tus ua haujlwm los ntawm quenching lub xeev zoo siab ntawm cov molecules induced los ntawm UV hluav taws xob, xa rov qab mus rau hauv av xeev thiab yog li txo qhov yuav tshwm sim ntawm photoredox tshuaj. Tsis tas li ntawd, qee cov stabilizers ntes cov dawb radicals tsim los ntawm cov txheej txheem photoredox, tiv thaiv lawv txoj kev koom tes hauv kev laus thiab tiv thaiv cov khoom siv polymer los ntawm kev puas tsuaj los ntawm UV.