Tshaj li kaum xyoo dhau los qhov xav tau kev txhim kho UVA tiv thaivtau nce ceev.
UV hluav taws xob muaj qhov cuam tshuam tsis zoo, suav nrog kev tshav ntuj, yees duab-kev laus thiab mob qog noj ntshav. Cov teebmeem no tsuas yog tiv thaiv tau los ntawm kev tiv thaiv tag nrho ntawm UV hluav taws xob, suav nrog UVA.
Ntawm qhov tod tes, kuj tseem muaj qhov sib txawv los txwv cov "tshuaj" ntawm daim tawv nqaij. Qhov no txhais tau tias muaj txiaj ntsig zoo heev UV absorbers uayuav tsum muaj rau qhov kev xav tau tshiab ntawm kev tiv thaiv UV dav.Sunsafe-BMTZ(Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine tau tsim los ua kom tiav qhov kev xav tau no. Nws yog cov duab-ruaj khov, roj-soluble, muaj txiaj ntsig zoo thiab npog UVB thiab UVA ntau yam. Xyoo 2000, European cov tub ceev xwm tau ntxiv Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine rau cov npe zoo ntawm cov tshuaj pleev ib ce UV absorbers.
•UVA:Ob pawg ortho-OH yuav tsum tau ua kom muaj zog ua kom muaj zog los ntawm kev sib txuas ntawm intramolecular hydrogen. Txhawm rau kom tau txais kev nqus tau zoo hauv UVA, para-txoj haujlwm ntawm ob txoj haujlwm phenyl moieties yuav tsum tau hloov los ntawm O-alkyl, uas ua rau muaj bis-resorcinyl triazine chromophor.
•UVB:Cov phenyl pawg txuas ntxiv rau triazine ua rau UVB nqus. Nws tuaj yeem pom tau tias qhov kev ua tau zoo "tag nrho spectrum" ua tiav nrog O-alkyl nyob rau hauv txoj hauj lwm para. Tsis muaj solubilizing substituents, HPTs yog ze li insoluble hauv cov roj pleev xim. Lawv nthuav tawm cov yam ntxwv ntawm cov xim pigments (xws li cov ntsiab lus siab melting). Txhawm rau ua kom cov dej solubility hauv cov roj theem, cov qauv ntawm cov lim UV tau raug hloov kho raws li.
Cov txiaj ntsig:
Broad-spectrum tiv thaiv tshav ntuj
Zoo sib piv nrog rau lwm cov lim UV
Formula stability
Post lub sij hawm: Feb-18-2022