Kule minyaka eyishumi edlule isidingo sokuvikelwa kwe-UVA okuthuthukisiwelalikhula ngokushesha.
Imisebe ye-UV inemiphumela emibi, kuhlanganise nokushiswa yilanga, isithombe-ukuguga nomdlavuza wesikhumba. Le miphumela ingavinjelwa kuphela ngokuvikela kulo lonke uhla lwemisebe ye-UV, kuhlanganise ne-UVA.
Ngakolunye uhlangothi kukhona futhi umkhuba wokunciphisa inani "lamakhemikhali" esikhumbeni. Lokhu kusho ukuthi i-UV abso esebenza kahle kakhuluama-rberskufanele itholakalele imfuneko entsha yokuvikela okubanzi kwe-UV.I-Sunsafe-BMTZ(I-Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine yakhelwe ukufeza le mfuneko. Iqinile esithombeni, iyancibilika kuwoyela, isebenza kahle kakhulu futhi ihlanganisa ububanzi be-UVB ne-UVA. Ngonyaka ka-2000, iziphathimandla zaseYurophu zengeza i-Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine ohlwini oluhle lwezimonyo zokumunca i-UV.
•I-UVA:Amaqembu amabili e-ortho-OH ayadingeka ukuze kuhlakazwe amandla ngendlela efanele ngamabhuloho e-hydrogen e-intramolecular. Ukuze kutholwe ukumuncwa okuqinile ku-UVA, ukuma kwe-para-positions ye-phenyl moieties ezimbili ngokulandelana kufanele kufakwe i-O-alkyl, okuholela ku-bis-resorcinyl triazine chromophor.
•UVB:Iqembu le-phenyl elisele elixhunywe ku-triazine liholela ekumunceni kwe-UVB. Kungaboniswa ukuthi ukusebenza okuphezulu "kwe-spectrum egcwele" kufinyelelwa nge-O-alkyl etholakala ku-para-position. Ngaphandle kokuncibilikisa okunye, ama-HPT acishe angancibiliki emafutheni ezimonyo. Zibonisa izici ezijwayelekile zezingulube (isb, amaphuzu aphezulu ancibilika). Ukuze kwandiswe ukunyibilika ezigabeni zikawoyela, ukwakheka kwesihlungi se-UV sishintshiwe ngokufanele.
Izinzuzo:
Ukuvikelwa kwelanga okubanzi
Iqhathaniswa kakhulu nezinye izihlungi ze-UV
Ukuzinza kwefomula
Isikhathi sokuthumela: Feb-18-2022