lub teeb stabilizer
Lub teeb stabilizers yog siv los tiv thaiv cov yas thiab lwm yam ntaub ntawv los ntawm kev degradation los ntawm lub sij hawm ntev raug rau ultraviolet hluav taws xob. Kev cuam tshuam ntawm plastics rau ultraviolet hluav taws xob los ntawm lub hnub ci pib degradation los ntawm cov txheej txheem ntawm photooxidation. Qhov no tuaj yeem muaj ntau yam tsis zoo xws li kev hloov pauv ntawm qhov tsos (discoloration, gloss hloov thiab / lossis chalking), txo cov khoom siv kho tshuab thiab tsim kom pom qhov tsis xws luag xws li tawg. Lub teeb fluorescent siv rau sab hauv tsev teeb pom kev zoo kuj emit UV hluav taws xob, tab sis nyob rau theem qis dua hnub ci.
Raws li nyob rau hauv cov ntaub ntawv ntawm thermal oxidation, photooxidation yog cov txheej txheem cov tshuaj tiv thaiv uas muaj cov dawb radicals thiab hydroperoxide intermediates. Photostabilizers inhibit cov txheej txheem no los ntawm kev tshem tawm cov kab mob sib kis los yog los ntawm kev sib tw nqus cov teeb meem UV hluav taws xob.
Hindered amine teeb stabilizers (HALS) feem ntau ua haujlwm los ntawm kev tshem tawm cov dawb radical intermediates hauv cov txheej txheem photooxidation. HALS zoo heev rau lub teeb stabilization ntawm polyolefins, styrenic polymers thiab ib co engineering yas.
Ultraviolet (UV) absorbers ua haujlwm los ntawm kev tiv thaiv sab hauv ntawm cov khoom yas los ntawm kev puas tsuaj UV hluav taws xob. Cov khoom no yog tus cwj pwm los ntawm qhov muaj zog heev UV nqus thiab qib siab ntawm cov duab photostability. UV absorbers muaj txiaj ntsig zoo hauv kev ruaj khov ntau yam yas, suav nrog PVC thiab engineering yas. Lawv kuj tau siv rau hauv daim ntawv thov ntim yas los tiv thaiv pob khoom los ntawm UV hluav taws xob.
Kev sib xyaw ntawm HALS thiab UV absorbers feem ntau pom muaj kev sib koom ua ke ntawm lub teeb stabilizer ib leeg.
