Kule minyaka ilishumi idlulileyo imfuno yokhuseleko oluphuculweyo lwe-UVAyayisanda ngokukhawuleza.
Imitha ye-UV inemiphumo emibi, kuquka ukutshiswa kwelanga, ifoto-ukwaluphala nomhlaza wolusu. Ezi ziphumo zinokuthintelwa kuphela ngokukhusela kulo lonke uluhlu lwemitha ye-UV, kubandakanya i-UVA.
Ngakolunye uhlangothi kukho umkhwa wokunciphisa inani "lekhemikhali" eluswini. Oku kuthetha ukuba i-UV abso esebenza kakhuluiirberskufuneka ibekhona kwimfuno entsha yokhuseleko olubanzi lwe-UV.I-Sunsafe-BMTZ(I-Bis-Ethylhexyloxyphenol I-Methoxyphenyl Triazine yenzelwe ukuzalisekisa le mfuneko. I-photo-stable, i-oyile-enyibilikayo, isebenza kakuhle kwaye igubungela uluhlu lwe-UVB kunye ne-UVA. Ngonyaka ka-2000, abasemagunyeni baseYurophu bongeza i-Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine kuluhlu olulungileyo lwezithambisi ze-UV zokuthambisa.
•UVA:Amaqela amabini e-ortho-OH afunekayo ukuze achithe amandla ngokufanelekileyo ngeebhulorho ze-intramolecular hydrogen. Ukuze kufumaneke ukufunxwa okunamandla kwi-UVA, i-para-positions ye-phenyl moieties ezimbini ezifanelekileyo kufuneka zitshintshwe yi-O-alkyl, okukhokelela kwi-bis-resorcinyl triazine chromophor.
•UVB:Iqela eliseleyo lephenyl elincanyathiselwe kwi-triazine likhokelela ekufunxeni kwe-UVB. Kungabonakaliswa ukuba ubuninzi bokusebenza "obugcweleyo" bufezekiswa nge-O-alkyl ebekwe kwi-para-position. Ngaphandle kwe-solubilizing substituent, ii-HPTs ziphantse zinganyibiliki kwii-oyile zokuthambisa. Babonisa iimpawu eziqhelekileyo ze-pigments (umzekelo, iindawo eziphezulu zokunyibilika). Ukuze kwandiswe ukunyibilika kwizigaba zeoyile, ukwakheka kwesihluzo se-UV siguqulwe ngokufanelekileyo.
Izibonelelo:
Ukhuseleko lwelanga olubanzi
Xa zithelekiswa kakhulu nezinye izihluzi ze-UV
Uzinzo lwefomula
Ixesha lokuposa: Feb-18-2022