Plastics thiab lwm yam ntaub ntawv polymer, raug tshav ntuj los yog high-zog rays, yuav undergo photo-oxidative degradation vim lub nqus ntawm ultraviolet lub teeb lub zog, uas ua rau discoloration thiab ua hauj lwm degradation ntawm cov khoom. Txhua yam khoom uas tuaj yeem cuam tshuam lossis qeeb photooxidation yog hu ua lub teeb stabilizer lossis tus neeg sawv cev tiv thaiv ultraviolet.
Lub luag haujlwm tseem ceeb ntawm lub teeb stabilizers yog: tiv thaiv lub teeb, nqus thiab hloov lub teeb lub zog, quenching lossis ntes cov dawb radicals. Lub teeb stabilizers feem ntau muab faib ua plaub pawg: cov khoom tiv thaiv lub teeb, ultraviolet absorbers, quenchers thiab hindered amine teeb stabilizers raws li lawv cov txheej txheem ntawm kev ua.
Hindered amine lub teeb stabilizer yog ib hom lub teeb stabilizer uas siv ntau ntau hauv tsev thiab txawv teb chaws. Nws tuaj yeem decompose hydroperoxides, quench radical oxygen, ntxiab dawb radicals, thiab nws cov pab pawg muaj txiaj ntsig muaj cov khoom siv rov ua dua tshiab.
Tus nqi ntawm lub teeb stabilizer nyob rau hauv cov khoom feem ntau yog {{0}}.01 feem pua ~ 0.5 feem pua, thiab cov nyhuv yog zoo. Lub teeb stabilizer feem ntau muaj cov xwm txheej hauv qab no:
1. Nws tuaj yeem nqus tau ultraviolet lub teeb nyob rau hauv lub wavelength ntawm 290 ~ 410 nanometers, los yog muaj peev xwm quench lub zog ntawm zoo siab molecules, los yog muaj peev xwm txaus los ntxiab dawb radicals. Nws lub teeb stabilization nyhuv yog lub sij hawm ntev.
2. Zoo compatibility nrog cob, zoo thermal stability, tsis muaj tshuaj tiv thaiv nrog lwm yam additives, zoo extraction kuj.
3. Cov khoom tsis muaj tshuaj lom lossis tsis muaj tshuaj lom, tsis muaj kuab lom, tsis muaj nqi.
