Light stabilizer (English Name: Light Stabilizer; Photostabilizer) kye kimu ku bikozesebwa mu biva mu polimeeri (nga obuveera, kapiira, ebizigo, ebiwuzi ebikoleddwa mu butonde). Kiyinza okukuuma oba okunyiga amaanyi ga ultraviolet, okumalawo oxygen omu singlet n’okukola peroxidize hydrogen. Kiyinza okuvunda ebintu ne kifuuka ebintu ebitaliiko mulimu n’emirimu emirala, wansi w’obusannyalazo bw’ekitangaala, polimeeri esobola okumalawo oba okukendeeza ku busobozi bw’enkola z’ekitangaala, okuziyiza oba okulwawo enkola y’okussaako ekitangaala, bwe kityo ne kituuka ku kigendererwa ky’okugaziya obulamu bw’obuweereza bw’ebintu ebikolebwa mu polimeeri. Light stabilizer ye additive esobola okukuuma ebirungo ebiramu obutayonoonebwa kitangaala. Kiyinza okunyiga, okusaasaanya n’okutambuza emisinde egy’obulabe egya ultraviolet, bwe kityo ne kiziyiza bulungi oxidation, okukaddiwa, okuvunda n’ensonga endala embi, n’okugaziya obulamu bw’obuweereza bw’ebintu. Enkola y’okukola kw’ebinyweza ekitangaala okusinga etegeerekeka okuyita mu nkola bbiri enkulu: emu ye nkola y’okunyiga ekitangaala, kwe kugamba, ebitebenkeza ekitangaala bisobola okunyiga emisinde gya ultraviolet ne bikyusa amaanyi ga ultraviolet mu maanyi g’ebbugumu, bwe kityo ne kikendeeza ku buzibu bw’obusannyalazo bwa ultraviolet ku bintu ebiramu; Ekirala ye free radical capture mechanism, kwe kugamba, ekitangaala stabilizers zisobola okugatta ne free radicals, bwezityo ne zikendeeza ku sipiidi ya free radicals reactions n’okukuuma organic materials okuva mu oxidation n’okukaddiwa olw’obuwuka obuyitibwa free radicals. Okusinziira ku nkola ez’enjawulo ez’okukola n’engeri z’enzimba, ebinyweza ekitangaala bisobola okwawulwamu ebika bingi eby’enjawulo. Mu byo, ebika by’ebitangaaza ekitangaala ebisinga obungi mulimu: ebinyweza ekitangaala eky’okunyiga, ebyuma ebinyweza ekitangaala n’ebinyweza ekitangaala ekiwunyiriza.
1. Ekirungo ekiziyiza ekitangaala: Kino kye kika ky’ekintu ekiyinza okuziyiza oba okulaga emisinde gya ultraviolet, okuziyiza ekitangaala okuyingira mu polimeeri, bwe kityo ne kikuuma polimeeri. Ebirungo ebiziyiza ekitangaala mulimu langi ezitali za kiramu nga kaboni black ne titanium oxide, ne langi ez’obutonde nga phthalocyanine blue ne phthalocyanine green. Mu zo, Carbon Black y’esinga okukola shielding effect.
2. Ultraviolet absorber: Kisobola bulungi okunyiga emisinde gya ultraviolet nga girina obuwanvu bw’amayengo ga 290 ku 410nm, ate nga tekitera kunyiga kitangaala ekirabika. Kirina obutebenkevu obulungi obw’ebbugumu n’okunyweza ekitangaala. Okusinziira ku nsengekera yaabwe ey’eddagala, ziyinza okugabanyizibwamu: O-hydroxybenzophenones, benzotriazoles, salicylates, triazines, ne acrylonitriles ezikyusiddwa. Ekozesebwa ng’ekiziyiza ekitangaala ekiyamba era ekiziyiza ekitangaala ekiziyiza naddala mu polyolefins oba ebizigo.
. Alina ekikolwa ekirungi ekinyweza ku biwujjo era ng’asinga kukozesebwa mu firimu n’ebiwuzi. Okusinga ebimu ku divalent organic nickel chelates. Organic nickel light stabilizers zirina omulimu omulungi, naye olw’obutwa bwa ayoni z’ebyuma ebizito, ziyinza okukyusibwamu non-Toxic oba entono -eziziyiza obutwa.
. Okusinga eremesa ebiziyiza ekitangaala kya amine (HALs). Ye kika ekipya ekisinga okusuubiza eky’okunyweza ekitangaala eky’amaanyi-efficiency light stabilizer, nga buli mwaka okukula kw’obwetaavu kwa bitundu 20% okutuuka ku 30% mu nsi yonna.
5. Hydroperoxide Decomposer: y’emu ku ziziyiza ekitangaala kya amine eziremeseddwa. Ebiwujjo bisobola okukola hydroperoxides mu kiseera ky’okutereka n’okulongoosebwa, ekivaako okuvunda kw’ekitangaala (photooxidative degradation of polymers). Hydroperoxide decompers zisobola okuvunda peroxides okukola nayitrojeni omunywevu-oxygen free radicals n’okwongera okukwata free radicals. , bwe kityo ne kiziyiza okuvunda kwa polimeeri.
Mu bufunze, nga ekintu ekikulu eky’okwongerako, ekitangaala ekinyweza kisobola okugaziya obulamu bw’ebintu ebiramu n’okulongoosa obwesigwa bwabyo n’obutebenkevu bwabyo. Kkampuni yaffe ejja kusigala nga yeewaddeyo okunoonyereza n’okukozesa ebyuma ebinyweza ekitangaala n’okuwa ebintu ebirungi n’obuweereza eri abaguzi okwetoloola ensi yonna.
