Nyob rau lub kaum xyoo dhau los qhov kev xav tau rau kev tiv thaiv UVAtau nce nrawm.
UV hluav taws xob muaj cov kev tsis zoo, suav nrog tshav ntuj, duab-Laus thiab tawv nqaij hlav cancer. Cov teebmeem no tsuas tuaj yeem tiv thaiv los ntawm kev tiv thaiv los ntawm kev tiv thaiv tag nrho cov hluav taws xob UV, suav nrog UVA.
Ntawm qhov tod tes muaj kuj yog ib tug qauv los txwv cov nyiaj "tshuaj lom neeg" ntawm daim tawv nqaij. Qhov no txhais tau tias heev heev UV absolub nkojYuav tsum muaj rau cov kev xav tau tshiab ntawm kev tiv thaiv dav UV.SunSafe-Bmtz(Bis-Ethylhothoxphenol methoxyphenyphyral triazine tau tsim los ua kom tiav qhov kev xav tau no. Nws yog duab-ruaj khov, roj-soluble, heev npaum li cas thiab npog UVB thiab UVA ntau. Nyob rau hauv lub xyoo 2000, European cov tub ceev xwm ntxiv Bis-Ethylhexyphenol methoxyphyphylyl triazine rau cov npe zoo ntawm cov xim kom zoo nkauj UV nqus.
•UVA:Ob pawg ortho-huag yuav tsum muaj lub zog tsis zoo ntawm incamolecular hydrogen txuas hniav. Txhawm rau kom tau txais kev haum xeeb nyob rau hauv UVA, txoj haujlwm para-txoj haujlwm ntawm ob lub phenyl goeties yuav tsum tau hloov los ntawm O-Alkyl, ua rau muaj kab-resorcinyl triazine chromophor.
•UVB:Cov pab pawg phenyl txuas ntxiv rau lub triazine ua rau UVB kev nqus. Nws tuaj yeem pom tau hais tias siab "tag nrho Spectrum" kev ua tau tiav nrog O-Alkyl nyob hauv Para-txoj hauj lwm. Tsis muaj cov khoom pauv hloov chaw, HPTs yuav luag tsis muaj roj insoletle hauv cov roj kom zoo nkauj. Lawv nthuav tawm cov khoom ntiag tug ntawm cov pigments (piv txwv li, cov ntsiab lus siab). Txhawm rau ua kom ua rau solubility nyob rau hauv theem roj, cov qauv ntawm UV lim tau raug hloov kho raws li.
Cov txiaj ntsig:
Dav-spectrum lub hnub tiv thaiv
Mas piv nrog lwm cov lim v
Mis nyuj ruaj khov
Lub Sijhawm Post: Feb-18-2022