I-light stabilizer (igama lesiNgisi: I-light stabilizer; i-photostabilizer) iyisengezo semikhiqizo ye-polymer (njengamapulasitiki, irabha, okokunamathela, imicu yokwenziwa). Ingavikela noma imunce amandla e-ultraviolet, icime umoya-mpilo we-singlet futhi ikhiphe i-hydrogen. Ingakwazi ukubola izinto zibe yizinto ezingasebenzi kanye neminye imisebenzi, ukuze ngaphansi kwemisebe yokukhanya, i-polymer ingakwazi ukuqeda noma inciphise amathuba okusabela kwe-photochemical, ivimbele noma ibambezele inqubo ye-photoaging, ngaleyo ndlela ifinyelele inhloso yokwelula impilo yesevisi yemikhiqizo ye-polymer. I-light stabilizer iyisengezo esingavikela izinto eziphilayo emonakalweni wokukhanya. Ingakwazi ukumunca, ihlakaze futhi idlulise imisebe ye-ultraviolet eyingozi, ngaleyo ndlela imelane ngokuphumelelayo ne-oxidation, ukuguga, ukuwohloka nezinye izici ezimbi, futhi yandise impilo yesevisi yezinto. Indlela yokusebenza ye-stabilizers yokukhanya ibonakala ngokuyinhloko ngokusebenzisa izindlela ezimbili eziyinhloko: enye indlela yokumunca ukukhanya, okungukuthi, iziqinisi zokukhanya zingakwazi ukumunca imisebe ye-ultraviolet futhi ziguqule amandla e-ultraviolet abe amandla okushisa, ngaleyo ndlela kunciphise umthelela wemisebe ye-ultraviolet ezintweni eziphilayo; enye i-Free radical capture mechanism, okungukuthi, iziqinisi zokukhanya zingahlangana nama-radicals mahhala, ngaleyo ndlela zinciphise isivinini sokusabela kwama-radical mahhala futhi zivikele izinto eziphilayo ekugugeni nasekugugeni okubangelwa ama-radicals mahhala. Ngokwezinqubo ezahlukene zesenzo kanye nezici zesakhiwo, iziqinisi zokukhanya zingahlukaniswa zibe izinhlobo eziningi ezahlukene. Phakathi kwazo, izinhlobo ezivame kakhulu zokuqiniswa kokukhanya zifaka: ama-stabilizers okukhanya okumunca, ukudoba ama-stabilizers okukhanya kanye ne-chelating light stabilizers.
1. I-ejenti evikela ukukhanya: Lolu uhlobo lwento engavimba noma ibonise imisebe ye-ultraviolet, ivimbele ukukhanya ukuthi kungangeni ku-polymer, ngaleyo ndlela ivikele i-polymer. Ama-ejenti okuvikela ukukhanya ahlanganisa i-pigments ye-inorganic efana ne-carbon black ne-titanium oxide, kanye ne-organic pigments njenge-phthalocyanine eluhlaza okwesibhakabhaka kanye ne-phthalocyanine eluhlaza. Phakathi kwabo, i-carbon black inomphumela omuhle kakhulu wokuvikela.
2. I-Ultraviolet absorber: Ingakwazi ukumunca ngokuphumelelayo imisebe ye-ultraviolet enobude obungu-290 kuya ku-410nm, kuyilapho ingavamile ukumunca ukukhanya okubonakalayo. Inokuqina okuhle kokushisa kanye nokuzinza kokukhanya. Ngokuya ngesakhiwo sawo samakhemikhali, angahlukaniswa ngokuyinhloko abe: o-ama-hydroxybenzophenones, ama-benzotriazoles, ama-salicylates, ama-triazines, nama-acrylonitriles afakwe esikhundleni. Isetshenziswa njengesizinzisi sokukhanya esisizayo kanye nesiqiniseko sokukhanya esivimbelwe, ikakhulukazi kuma-polyolefin noma ama-coatings.
3. I-Quencher: Ingamukela amandla amuncwa i-chromophore kupulasitiki futhi ikhiphe la mandla ngendlela yokushisa, i-fluorescence noma i-phosphorescence, ngaleyo ndlela ivikele i-polymer emonakalweni we-ultraviolet. Inomphumela omuhle wokuzinzisa kuma-polymers futhi isetshenziswa kakhulu kumafilimu namafayibha. Ikakhulukazi amanye ama-divalent organic nickel chelates. Izinzinzisi ze-nickel light stabilizer zisebenza kahle, kodwa ngenxa yobuthi be-ayoni yensimbi enzima, zingase zithathelwe indawo ezinye{4}ezingewona ubuthi noma{5}}izici ezinobuthi obuphansi.
4. I-ejenti yokuthwebula yamahhala: Lolu hlobo lwe-stabilizer yokukhanya lungathwebula ama-radicals wamahhala asebenzayo akhiqizwe kuma-polymer, ngaleyo ndlela luvimbele inqubo ye-photooxidation futhi luzuze ukuqiniswa kokukhanya. Izinzinzisi zokukhanya ze-amine ezivimbelwe kakhulu (HALS). Iwuhlobo olusha oluthembisayo kakhulu{3}}lwesinzinzisi sokukhanya esisebenza kahle kakhulu, esinesilinganiso sokukhula kwesidingo saminyaka yonke esingu-20% kuya ku-30% emhlabeni jikelele.
5. I-Hydroperoxide decomposer: Ingenye yezinto ezivimbela ukukhanya kwe-amine. Ama-polymers angakhiqiza ama-hydroperoxides ngesikhathi sokugcinwa nokucubungula, okuholela ekulimazeni kwe-photooxidative yama-polymers. I-Hydroperoxide decomposer ingabolisa ama-peroxide ukuze ikhiqize i-nitrogen ezinzile{3}}ama-radicals angenawo umoya-mpilo futhi iqhubeke nokuthwebula ama-radicals mahhala. , ngaleyo ndlela kuvimbela ukuwohloka kwe-polymer.
Ukufingqa, njengesengezo esibalulekile, isiqiniseko sokukhanya singanweba impilo yesevisi yezinto eziphilayo futhi sithuthukise ukwethembeka nokuzinza kwazo. Inkampani yethu izoqhubeka nokuzinikela ocwaningweni nasekusetshenzisweni kweziqinisi ukukhanya futhi inikeze imikhiqizo namasevisi angcono kubathengi emhlabeni wonke.
